WO2020175470A1 - Air supply system, control method for air supply system, and control program for air supply system - Google Patents

Abstract

The present invention decreases the consumption of compressed dry air while maintaining excellent dehumidification performance. This air supply system (10) comprises: an air drying circuit (11) that is provided between a compressor (4) for sending compressed air and an air tank (30) for storing compressed dry air, and that comprises a filter (17) for capturing moisture; and an ECU (80) that controls the air drying circuit (11). The ECU (80): performs a dehumidification operation in which the air drying circuit (11) is controlled and the compressed air sent from the compressor (4) is passed through the filter (17) in the forward direction and supplied to the air tank (30); performs a regeneration operation in which the air drying circuit (11) is controlled and the compressed dry air stored in the air tank (30) is passed through the filter (17) in the reverse direction and the fluid that passes through the filter is discharged from a drain discharge port (27); and sets the amount of regeneration air consumed in the regeneration operation in response to the operating state of the compressor (4).

Description

\¥0 2020/175470 1 ?<:17 2020/007469 Clarification

Title of invention:

Air supply system, control method of air supply system, and control program of air supply system

Technical field

The present disclosure relates to an air supply system, an air supply system control method, and an air supply system control program.

Background technology

[0002] In vehicles such as trucks, buses, and construction machines, pneumatic systems including a braking system and a suspension system are controlled by using compressed air sent from a compressor. This compressed air contains liquid impurities such as moisture contained in the atmosphere and oil that lubricates the inside of the compressor. If compressed air that contains a large amount of water and oil enters the pneumatic system, it may lead to malfunction and malfunction of the rubber member. For this reason, a compressed air dryer is installed downstream of the compressor to remove impurities such as water and oil in the compressed air.

The compressed air drying device includes a filter containing a desiccant and various valves. The compressed air drying device performs a dehumidifying operation of passing compressed air through a filter to remove moisture and the like from the compressed air. The compressed dry air generated by the dehumidifying operation is stored in the air tank. In addition, the cleaning function of the compressed air dryer decreases with the amount of compressed dry air supplied. Therefore, the compressed air drying device removes the oil and water adsorbed in the filter from the filter, and performs the regenerating operation of discharging the removed oil and water as drain (for example, see Patent Document 1). Prior art documents

Patent literature

[0004] Patent Document 1: Japanese Unexamined Patent Publication No. 2 0 1 0 _ 2 0 1 3 2 3

Summary of the invention 〇 2020/175470 2 (:171? 2020/007469) Problems to be solved by the invention

[0005] Execution conditions such as the time for executing the regeneration operation, the amount of regeneration air to be passed through the filter, etc. are set to be constant, or are determined according to the amount of compressed air sent from the compressor. Has been done. However, it has been found by the inventors that in either case, excess or deficiency occurs. If the regeneration time or the amount of regenerated air is insufficient, the moisture trapping ability of the desiccant may not return to its original level, and the amount of moisture contained in the air sent from the compressed air drying device may increase. On the other hand, if the regeneration time or the amount of regenerated air becomes excessive, the compressed dry air in the air tank, which originally supplies the pneumatic system, is wastefully consumed. Compressed dry air is generated by a compressor driven by a rotary drive source such as an engine, so excessive consumption of compressed dry air increases the load on the rotary drive source and reduces fuel consumption of the vehicle.

[0006] An object of the present disclosure is to reduce the amount of compressed dry air consumed by the air supply system while maintaining the dehumidification performance of the air supply system.

Means for solving the problem

[0007] An air supply system that solves the above problems is provided between a compressor that delivers compressed air and a storage unit that stores compressed dry air, and has an air drying circuit that has a filter that traps moisture. A control device for controlling the air drying circuit, the control device performing a dehumidifying operation in which the compressed air sent from the compressor is passed through the filter in the forward direction to be supplied to the storage section. The air drying circuit is controlled so that the compressed dry air stored in the storage section is passed through the filter in the reverse direction, and the fluid that has passed through the filter is discharged from the discharge port. The air drying circuit is controlled so that the amount of regenerated air consumed in one regenerating operation is set according to the operating state of the compressor.

[0008] An air supply system control method that solves the above-mentioned problem is provided with a filter that captures water, which is provided between a compressor that delivers compressed air and a reservoir that stores compressed dry air. Circuit and control the air drying circuit 〇 2020/175 470 3 卩 (：171? 2020 /007469

A control method of an air supply system, comprising: a control device for performing a dehumidifying operation in which the compressed air sent from the compressor is passed through the filter in a forward direction to be supplied to the storage section. The air drying circuit is controlled so that the compressed dry air stored in the storage section is passed through the filter in the reverse direction, and the fluid that has passed through the filter is discharged from the discharge port. The air drying circuit is controlled to set the amount of regeneration air consumed in one regeneration operation according to the operating state of the compressor.

A control program for an air supply system that solves the above-mentioned problems is provided between a compressor that delivers compressed air and a storage section that stores compressed dry air, and has a filter that captures moisture. A control program for an air supply system comprising a drying circuit and a control device for controlling the air drying circuit, the control device causing the compressed air sent from the compressor to pass through the filter in a forward direction. A dehumidifying operation executing unit that controls the air drying circuit to execute a dehumidifying operation to be supplied to the storage unit, and allows the compressed dry air stored in the storage unit to pass through the filter in the reverse direction and through the filter. A regeneration operation execution unit that controls the air drying circuit to perform a regeneration operation that discharges the fluid from the discharge port, and a regeneration air that is consumed by one regeneration operation according to the operating state of the compressor. Function as a setting unit, which sets the amount

[0010] According to the above configuration, the control device sets the amount of regeneration air consumed in the regeneration operation based on the operating state of the compressor. The compressor is driven according to the supply condition of compressed dry air to devices other than the air drying circuit.Therefore, by changing the amount of regenerated air, it is possible to supply compressed dry air from the storage unit to devices other than the air drying circuit. Either cleaning of the filter can be prioritized.

[001 1] In the air supply system, the control device reduces the regeneration air amount when the operation rate of the compressor is high within a certain period, and when the operation rate of the compressor is low, It may be configured to increase the regeneration air amount. 〇 2020/175 470 (:171? 2020 /007469

[0012] According to the above configuration, when the operating rate of the compressor is high and the degree of supply of compressed dry air from the storage section to devices other than the air drying circuit is large, the amount of regenerated air is reduced to It is possible to suppress the consumption of the compressed dry air stored in the storage section and give priority to the supply of the compressed dry air to devices other than the air drying circuit. In addition, if the operating rate of the compressor is low and the degree of supply of compressed dry air from the storage section to devices other than the air drying circuit is small, the filter cleaning can be prioritized.

[0013]In the air supply system, the controller increases the amount of regenerated air when the index indicating the wet state of the compressed dry air in the storage section is high, When the index indicating the wet state is low, the amount of regenerated air may be reduced.

[0014] According to the above configuration, when the wet state of the compressed dry air is high, it is possible to give priority to the cleaning of the filter by increasing the amount of regenerated air. Further, when the wet condition is low, the consumption of the compressed dry air stored in the storage section can be suppressed to give priority to the supply of the compressed dry air to devices other than the air drying circuit.

[0015]In the air supply system, the control device sets a high upper limit pressure for starting the regeneration operation, which is the pressure of the storage section when the operation rate of the compressor is high, When the operating rate is low, the upper limit pressure is set low, when the upper limit pressure is high, the regeneration air amount is reduced, and when the upper limit pressure is low, the regeneration air amount is increased. May be done

According to the above configuration, the upper limit pressure for starting the regeneration operation is set according to the operating state of the compressor. Also, the amount of regenerated air is determined according to the upper limit pressure. When the operating rate of the compressor is high, the upper limit pressure is set high and the amount of regenerated air is reduced, so that the frequency of regenerating operations is reduced and the consumption of compressed dry air stored in the storage section is suppressed, thereby reducing air drying. The supply of compressed dry air to equipment other than the circuit can be prioritized. Also, the operating rate of the combreza is low. 〇 2020/175 470 5 卩 (：171? 2020 /007469

In this case, the upper limit pressure is set low and the amount of regeneration air is increased, so that it is possible to increase the frequency of regeneration operations and enhance the effect of purifying the filter.

An air supply system that solves the above problems is provided between a compressor that delivers compressed air and a storage unit that stores compressed dry air, and has an air drying circuit that has a filter that traps moisture. A control device for controlling the air drying circuit, the control device performing a dehumidifying operation in which the compressed air sent from the compressor is passed through the filter in the forward direction to be supplied to the storage section. The air drying circuit is controlled so that the compressed dry air stored in the storage section is passed through the filter in the reverse direction, and the fluid that has passed through the filter is discharged from the discharge port. The air drying circuit is controlled so that the amount of regenerated air consumed in one regenerating operation is set according to the temperature of the compressed air or the compressed dried air.

[0018] An air supply system control method that solves the above-mentioned problem is provided with a filter that traps water, which is provided between a compressor that delivers compressed air and a reservoir that stores compressed dry air. A control method for an air supply system comprising a circuit and a control device for controlling the air drying circuit, wherein the control device allows the compressed air sent from the compressor to pass through the filter in a forward direction to store the compressed air. The air drying circuit is controlled so as to execute a dehumidifying operation for supplying the compressed dry air stored in the storage section to the filter in the reverse direction, and the fluid passing through the filter is discharged from the outlet. The air drying circuit is controlled so as to execute the discharging operation for discharging, and the amount of the reproducing air consumed by one time of the reproducing operation is set according to the temperature of the compressed air or the temperature of the compressed dry air.

[0019] An air supply system control program that solves the above-mentioned problems is provided between a compressor for delivering compressed air and a reservoir for storing compressed dry air, and has a filter for trapping moisture. A control program for an air supply system comprising a drying circuit and a control device for controlling the air drying circuit, wherein the control device controls the compressed air sent from the compressor. 〇 2020/175 470 6 卩 (：171? 2020 /007469

Dehumidifying operation execution unit that controls the air drying circuit so as to perform a dehumidifying operation that allows the air to pass through the filter in the forward direction and supplies the dehumidifying operation to the storage unit; And a temperature of the compressed dry air or a temperature of the compressed dry air that controls the air drying circuit to perform a regeneration operation of discharging the fluid that has passed through the filter and is discharged from the outlet. According to the above, it functions as a setting unit that sets the amount of regeneration air consumed in one regeneration operation.

According to the above configuration, the control device sets the amount of regenerated air consumed in the regenerating operation according to the temperature of the compressed air or the temperature of the compressed dry air. When the temperature of the compressed air or the temperature of the compressed dry air rises, the amount of water contained in the air also increases.Therefore, by changing the amount of regenerated air according to the amount of water contained in the air, Either supply of compressed dry air to equipment other than the air drying circuit or cleaning of the filter can be prioritized.

[0021] In the air supply system, the control device is configured to reduce the amount of regenerated air when the temperature is low, and increase the amount of regenerated air when the temperature is high. Good.

[0022] According to the above configuration, when the temperature of air is low and the amount of saturated steam is small, the amount of regenerated air is reduced, thereby suppressing the consumption of the compressed dry air stored in the storage unit and performing air drying. The supply of compressed dry air to devices other than the circuit can be prioritized. When the temperature of air is high and the amount of saturated steam is large, the amount of regenerated air can be increased to prioritize the filter cleaning.

Effect of the invention

[0023] According to the present disclosure, it is possible to reduce the amount of compressed dry air consumed by the air supply system while maintaining the dehumidification performance of the air supply system.

Brief description of the drawings

FIG. 1 is a configuration diagram showing a schematic configuration of a first embodiment of an air supply system.

[Fig. 2] Figs. 28 to 2 are views showing first to sixth operation modes of the air drying circuit of the embodiment of Fig. 1, respectively. 〇 2020/175 470 7 卩 (: 171? 2020 /007469

[FIG. 3] FIG. 3A is a map of a standard regenerated air amount for calculating the regenerated air amount of the embodiment of FIG. 1, and FIG. 3 is a correction for calculating the regenerated air amount of the embodiment of FIG. Map of unit air volume.

FIG. 4 is a schematic diagram of excess/deficiency coefficient information of the embodiment of FIG.

[FIG. 5] A flow chart showing an example of a procedure for supplying compressed air in the embodiment of FIG. 1.

[FIG. 6] A flow chart showing an example of a procedure for performing a reproducing operation in the embodiment of FIG. 1.

FIG. 7 is a flow chart showing an example of a procedure for determining the regeneration air amount in the embodiment of FIG.

[FIG. 8] FIG. 8A is a map of the standard regenerated air amount for calculating the regenerated air amount of the second embodiment, and FIG. 8 is a correction unit air for calculating the regenerated air amount of the second embodiment. Quantity map.

FIG. 9 is a flow chart showing an example of a procedure for determining the regeneration air amount in the embodiment of FIG.

MODE FOR CARRYING OUT THE INVENTION

[0025] (First Embodiment)

A first embodiment of the air supply system will be described with reference to FIGS. 1 to 6. The air supply system is installed in automobiles such as trucks, buses, and construction machines. The compressed dry air generated by the air supply system is used in a pneumatic system such as a brake system (braking device) or a suspension system (suspension device) of an automobile.

[0026] <Air supply system 10>

The air supply system 10 will be described with reference to FIG. The air supply system 10 is provided with a compressor 4, an air drying circuit 11 and an ECU (Electronic Control Unit) 80. The ECU 80 functions as a control device, a dehumidification operation execution unit, a regeneration operation execution unit, and a setting unit. [0027] The ECU 80 is connected to the air drying circuit 11 via a plurality of wirings E61 to E67. 〇 2020/175 470 8 卩 (：171? 2020 /007469

Has been continued. The ECU 80 includes a calculation unit, a communication interface unit, a volatile storage unit, and a non-volatile storage unit. The arithmetic unit is a computer processor and is configured to control the air drying circuit 11 according to an air supply program stored in a non-volatile storage unit (storage medium). The arithmetic unit may realize at least a part of the processing executed by itself by a circuit such as AS IC. The air supply program may be executed by one computer processor or may be executed by a plurality of computer processors. In addition, the ECU 80 includes a storage unit 80A that stores information for determining the execution frequency of each operation of the air drying circuit 11. The storage unit 80A is a non-volatile storage unit or a volatile storage unit, and may be the same as or different from the storage unit in which the control program is stored.

[0028] The ECU 80 is connected to other ECUs (not shown) mounted on the vehicle, such as an engine ECU and a brake ECU, via an in-vehicle network such as CAN (Controller Area Network). Has been done. The ECU 80 acquires information indicating the vehicle state from those ECUs. The information indicating the vehicle state includes, for example, ignition switch OFF information, vehicle speed, engine drive information, and the like.

[0029] The state of the compressor 4 is based on a command from the ECU 80 between an operating state in which air is compressed and sent (load operation) and a non-operating state in which air is not compressed (idle operation). Can be switched. The compressor 4 operates by the power transmitted from a rotary drive source such as an engine.

[0030] The air drying circuit 11 is a so-called air dryer. The air drying circuit 11 is connected to the ECU 80, and removes moisture and the like contained in the compressed air sent from the compressor 4 during load operation. The air drying circuit 11 supplies the dried compressed air (hereinafter, compressed dry air) to the supply circuit 12. The compressed dry air supplied to the supply circuit 12 is stored in the air tank 30.

[0031] The compressed dry air stored in the air tank 30 is supplied to the brake installed in the vehicle. 〇 2020/175 470 9 卩 (：171? 2020 /007469

Supply to pneumatic system such as system. For example, when the frequency of braking is high, such as when a vehicle travels on a downhill road or an urban area, the amount of compressed dry air stored in the air tank 30 increases. On the contrary, when the brake is operated infrequently, the amount of compressed dry air stored in the air tank 30 is reduced.

The air drying circuit 11 has a maintenance port 12. The maintenance port 12 is a port for supplying air to the air drying circuit 11 through it during maintenance.

[0033] The air drying circuit 11 has a filter 1 inside the case 1 18 (see Fig. 28).

Equipped with 7. The filter 17 is provided in the middle of the air supply passage 18 which connects the compressor 4 and the supply circuit 12. Filter 17 contains a desiccant. In addition to the desiccant, the filter 17 also includes an oil trap portion that traps oil. The oil capturing part may be a foam such as urethane foam, a metal material having a large number of ventilation holes, a glass fiber filter, or the like as long as it can capture the oil while allowing air to pass therethrough.

[0034] The filter 17 removes the water contained in the compressed air from the compressed air to dry the compressed air by passing the compressed air sent from the compressor 4 through the desiccant. Further, the oil trap portion traps oil contained in the compressed air to purify the compressed air. The compressed air that has passed through the filter 17 is supplied to the supply circuit 12 via the downstream check valve 19. The downstream check valve 19 allows only air flow from upstream to downstream when the filter 17 side is upstream and the supply circuit 12 side is downstream. Since the downstream check valve 19 has a predetermined valve opening pressure (sealing pressure), the upstream pressure becomes higher than the downstream pressure by the valve opening pressure when compressed air flows.

Further, a bypass passage 20 as a bypass for bypassing the downstream check valve 19 is provided downstream of the filter 17 in parallel with the downstream check valve 19. A regeneration control valve 21 is provided in the bypass passage 20.

[0036] The regeneration control valve 21 is a solenoid valve controlled by the valve 311800. 〇 2020/175 470 10 卩 (：171? 2020 /007469

80 controls the regeneration control valve 2 1 power on/off (driving/non-driving) via the wiring date 6 4 to switch the regeneration control valve 2 1 operation. The regeneration control valve 21 is closed when the power is off to seal the bypass passage 20 and opened when the power is on to communicate the bypass passage 20. The MII II 80, for example, receives the value of the air pressure in the air tank 30 and operates the regeneration control valve 21 when the value of the air pressure exceeds a predetermined range.

An orifice 22 is provided in the bypass passage 20 between the regeneration control valve 21 and the filter 17. When the regeneration control valve 21 is energized, the compressed dry air on the side of the supply circuit 12 is sent to the filter 17 through the bypass passage 20 while the flow rate is regulated by the orifice 22. The compressed dry air sent to the filter 17 flows backward through the filter 17 from the downstream side to the upstream side, and passes through the filter 17. Such processing is an operation of regenerating the filter 17 and is called a regenerating operation of the air drying circuit 11. At this time, the compressed dry air sent to the filter 17 is the dried and purified air supplied to the supply circuit 12 from the air supply passage 18 through the filter 17 etc. The water and oil trapped in 7 can be removed from the filter 17. In the normal control, the No. 1 1 180 opens the regeneration control valve 21 when the pressure in the air tank 30 reaches the upper limit value (cutout pressure). On the other hand, when the pressure in the air tank 30 reaches the lower limit (cut-in pressure), the opened regeneration control valve 21 is closed.

[0038] A branch passage 16 is branched from a portion between the combiner 4 and the filter 17. A drain discharge valve 25 is provided in the branch passage 16 and a drain discharge port 27 is connected to the end of the branch passage 16.

The drain, which is a fluid containing water and oil removed from the filter 17 is sent to the drain discharge valve 25 together with compressed air. The drain discharge valve 25 is a pneumatically driven valve driven by air pressure, and is provided in the branch passage 16 between the filter 17 and the drain discharge port 27. The drain discharge valve 25 is a 2-port 2-position valve that changes its position between a closed position and an open position. 〇 2020/175 470 1 1 卩 (：171? 2020 /007469

.. When the drain discharge valve 25 is in the open position, the drain is sent to the drain discharge port 27. The drain discharged from the drain outlet 27 may be collected by an oil separator (not shown). The drain corresponds to the fluid passing through the filter 17 in the opposite direction.

[0040] The drain discharge valve 25 is controlled by the governor 2 68. Governor 2 6 8

, Is a solenoid valve controlled by Ⅱ II 80. The Ⅱ II 80 switches the operation of the governor 2 68 by controlling the turning on/off (drive/non-drive) of the governor 2 68 via the wiring 6 3. When the power is turned on, the governor 268 switches to the input position where the pneumatic signal is input to the drain discharge valve 25, thereby opening the drain discharge valve 25. When the power is turned off, the governor 26 8 switches the drain discharge valve 25 port to the open position where the drain discharge valve 25 port is opened to atmospheric pressure without inputting an air pressure signal to the drain discharge valve 25. Close valve 2 5.

[0041] The drain discharge valve 25 is maintained in the closed position where the branch passage 16 is shut off in the state where the air pressure signal is not input from the governor 26, and the air pressure signal is input from the governor 26. And the valve is opened to connect the branch passage 16 with each other. When the pressure of the inlet casing connected to the compressor 4 at the drain discharge valve 25 exceeds the upper limit value, the drain discharge valve 25 is forcibly switched to the open position.

An upstream check valve 15 is provided between the compressor 4 and the filter 17 and between the compressor 4 and the branch passage 16. The upstream check valve 15 allows only the air flow from upstream to downstream when the compressor 4 side is upstream and the filter 17 side is downstream. Since the upstream check valve 15 has a predetermined valve opening pressure (sealing pressure), when the compressed air flows, the upstream pressure becomes higher than the downstream pressure by the valve opening pressure. A reed valve at the outlet of the compressor 4 is provided upstream of the upstream check valve 15. A branch passage 16 and a filter 17 are provided downstream of the upstream check valve 15. 〇 2020/175 470 12 boxes (：171? 2020 /007469

[0043] The combiner 4 is controlled by the unload control valve 26. The unload control valve 26 is a solenoid valve controlled by 〇118. The ∙ ∙ ∙ 1 800 switches off the operation of the unload control valve 2 ∙ 6 by controlling the power on/off (drive/non-drive) of the unload control valve 2 6 ∘ via the wiring switch 6 2. Change. When the power is turned off, the unload control valve 2 6 switches to the open position, and opens the flow path between the unload control valve 2 6 and the compressor 4 to the atmosphere. Further, when the power is turned on, the unload control valve 26 switches to the supply position and sends an air pressure signal consisting of compressed air to the compressor 4.

[0044] The state of the compressor 4 is switched to a non-operation state (idle operation) when an air pressure signal is input from the unload control valve 26. For example, when the pressure in the air tank 30 reaches the cutout pressure, it is not necessary to supply compressed dry air. When the pressure on the supply circuit 1 2 side reaches the cutout pressure and the power is turned on (3 11 800 turns on the unload control valve 26 6 (drives the unload control valve 2 6)), the unload control is performed. Valve 26 is switched to the supply position, which causes the pneumatic control valve 26 to supply the pneumatic signal to the compressor 4 and switch the state of the compressor 4 to the non-operational state.

A pressure sensor 50 is provided between the compressor 4 and the upstream check valve 15. The pressure sensor 50 is connected to the air supply passage 18 and measures the air pressure in the air supply passage 18 and transmits the measurement result to the wire Ⅱ II 80 via the wiring wire 6 1. To do.

A humidity sensor 51 and a temperature sensor 52 are provided between the downstream check valve 19 and the supply circuit 12. The humidity sensor 51 may detect absolute humidity or may detect relative humidity. The humidity sensor 51 and the temperature sensor 52 measure the humidity of the compressed air downstream of the filter 17 and the temperature of the compressed air, respectively, and the measurement results are sent via wiring days 6 5 and 6 6 respectively. Output to 80. MII II 80 determines the wet state of compressed dry air based on the humidity and temperature input from humidity sensor 51 and temperature sensor 52. 〇 2020/175 470 13 卩 (：171? 2020 /007469

[0047] Further, a pressure sensor 5 is provided between the downstream check valve 19 and the supply circuit 12.

Three are provided. The pressure sensor 53 is provided so as to detect the air pressure in the air tank 30 and outputs the detected pressure value to the ECU 80 via the wiring E67. The pressure between the downstream check valve 19 and the supply circuit 12 is the same as the pressure in the air tank 30. The detection result of the pressure sensor 53 can be used as the pressure in the air tank 30. The pressure sensor 53 may be provided in the supply circuit 12 or the air tank 30.

[0048] <Explanation of operation of air drying circuit 11>

As shown in FIGS. 2A to 2F, the air drying circuit 11 has a plurality of operation modes including at least a first operation mode to a sixth operation mode.

[0049] (First operation mode)

As shown in FIG. 2A, the first operation mode is a mode for performing a normal dehumidifying operation (mouth operation). In the first operation mode, the regeneration control valve 21 and the unload control valve 26B are each closed (indicated as "CLOSE" in the figure), the governor 26A is opened, and no air pressure signal is input to the compressor 4. Position (marked as “CLOSE” in the figure). At this time, power is not supplied to the regeneration control valve 21, the governor 26 A, and the unload control valve 26 A. Further, the governor 26 A and the unload control valve 26 6 open the port of the compressor 4 and the port of the drain discharge valve 25, which are connected downstream of them, to the atmosphere, respectively. In the first operation mode, when compressed air is being supplied from the compressor 4 (denoted as "○N" in the figure), the filter 17 removes water and other components, and compressed air is supplied to the supply circuit 12 2. ..

[0050] (Second operation mode)

As shown in FIG. 2B, the second operation mode is a mode in which the compressed dry air in the air drying circuit 11 is passed through the filter 17 to perform the purging operation to purify the filter 17. In the second mode, the regeneration control valve 21 is closed, the unload control valve 26 B is in the supply position (marked as "OPEN" in the figure), and the governor 26 A is in the input position ("OPEN" in the figure). And)). At this time, the governor 〇 2020/175 470 14 卩 (：171? 2020 /007469

2 6 and the unload control valve 2 6 are both supplied with power, and the ports of the compressor 4 and the drain discharge valve 25, which are connected downstream of them, are respectively connected to the upstream side (supply circuit 1 2 Side). As a result, the Comblator 4 switches to the non-operational state (marked as "○" in the figure).

, The drain discharge valve 25 is opened. As a result, the compressed dry air between the downstream check valve 19 and the filter 17 flows in the filter 17 in the direction opposite to the air flow in the first operation mode (dehumidification mode) (backflow), Moisture and the like captured by the filter 17 is discharged as drain from the drain outlet 27. Moreover, the air pressure in the filter 17 and the air supply passage 18 is released to atmospheric pressure.

[0051] (Third operation mode)

As shown in Fig. 20, the third operation mode is a mode for performing the reproduction operation for reproducing the filter 17. In the third operation mode, the regeneration control valve 21 is opened, the governor 26 is set as the input position, and the unload control valve 26 is set as the supply position (indicated as "○" in each figure). ). At this time, power is supplied to the regeneration control valve 2 1 in addition to the governor 26 8 and the inlet control valve 26 6. In the third operation mode, the compressor 4 is deactivated and the compressed dry air stored in the supply circuit 12 or the air tank 30 is caused to flow back to the filter 17 and is discharged from the drain outlet 27. Let As a result, the water and the like captured by the filter 17 are removed. The second operation mode and the third operation mode are both modes for purifying the filter 17, but the third operation mode is different from the second operation mode in that the regeneration control valve 21 is opened at least. different. Thus, in the third operation mode, the compressed dry air in the air tank 30 can be passed through the supply circuit 12 and the bypass passage 20 to the filter 17. Therefore, the effect of cleaning the filter 17 is higher than that of the second operation mode. Also in the third operation mode, the air pressure in the filter 17 and the air supply passage 18 is released to the atmospheric pressure.

[0052] (Fourth operation mode)

As shown in Fig. 20, the fourth operation mode is the oil cut operation mode. 〇 2020/175 470 15 卩(：171? 2020/007469

Is. In the fourth operation mode, while the compressor 4 is operating, the excess oil air sent from the compressor 4 is discharged from the drain outlet 27 without passing through the filter 17. When the compressor 4 is not in operation, oil may accumulate in the compression chamber of the compressor 4. When the state of the compressor 4 is switched to the operating state while the oil is accumulated in the compression chamber, the amount of oil contained in the compressed air sent from the compression chamber increases. When oil adheres to the desiccant, the dehumidification performance of the desiccant decreases. Therefore, the oil cut operation is performed to discharge the compressed air that contains too much oil. In the fourth operation mode, the regeneration control valve 21 is closed, the unload control valve 26B is in the open position (denoted as "CLOSE" in the figure), and the governor 26A is opened after a certain period of operation. Position (marked as “CLOSE” in the figure). As a result, even if compressed air containing a relatively large amount of oil is sent out from the compressor 4, the compressed air can be discharged from the drain outlet 27 without passing through the filter 17. Therefore, it is possible to prevent the dehumidification performance of the filter 17 from decreasing immediately after the combustor 4 is switched from the non-operating state to the operating state. The oil cutting operation can also be performed when the engine speed increases in the operating state and when the oil content from the compressor 4 increases when the engine is under heavy load.

[0053] (Fifth Operation Mode)

As shown in Fig. 2E, the fifth operation mode is a mode in which the compressor stops without purging. In the fifth operation mode, the regeneration control valve 21 is closed, the governor 26A is in the open position (indicated as "CLOSE" in the figure), and the unload control valve 26B is in the supply position (see the figure). "OPEN"). In the fifth operation mode, when the compressor 4 is not operating, the compressed air or the compressed dry air remaining in the desiccant in the air supply passage 18 or the filter 17 should not be discharged from the drain outlet 27. The air pressure is maintained at.

[0054] (Sixth operation mode)

As shown in Fig. 2F, the sixth operation mode is the assist operation for pressurization processing. 〇 2020/175 470 16 卩(：171? 2020/007469

It is a mode to do. In the sixth operation mode, the regeneration control valve 21 is opened, the inlet control valve 26 B is set to the supply position (indicated as “OPEN” in the figure), and the governor 26 A is set to the open position (in the figure, CLOS E”). In the sixth operation mode, when the compressor 4 is in the non-operational state, the compressed air in the supply circuit 12 is supplied (backflowed) into the desiccant in the air supply passage 18 and the filter 17 to generate air. The pressure in the supply passage 18 and the filter 17 is made higher than the atmospheric pressure to maintain the back pressure (air pressure) of the upstream check valve 15 at a pressure higher than the atmospheric pressure.

[0055] (Setting execution conditions)

Next, with reference to FIG. 3, a method of determining the amount of air consumed in the regeneration operation (third operation mode) (hereinafter referred to as the amount of regeneration air) will be described. The ECU 80 executes the control program to calculate the regeneration air amount Am according to the following equation (1). The amount of regenerated air Am may be calculated in volume units or mass units. Note that various coefficients for converting the unit may be used for the right side (or the left side) of this equation (1).

[0056] Regenerated air volume Am

= Standard regeneration air volume Am 1 _ correction unit air volume A m2 X excess/deficiency coefficient a (1) Note that “standard regeneration air volume A m 1” is calculated from “correction unit air volume A m 2 X excess/deficiency coefficient a”. Is also set to be large, and the amount of regenerated air Am exceeds “0”. The standard regeneration air volume Am 1 is basically the air volume determined by the specifications of the air drying circuit 11 but is changed according to the cutout pressure which is the upper limit of the pressure of the air tank 30. As described above, the cutout pressure is the pressure that is the condition for starting the regeneration operation and the purge operation, and the higher the operating rate of the compressor 4, the higher the value is set and stored in the storage unit 80A. For example, if the operating rate is less than the specified value R 1 (for example, 30%), the cutout pressure P○ 1 that is a relatively low value is set, and the operating rate is the specified value R 1 or more and the specified value R 2 (for example, 60%. ) Below, a cutout pressure P 〇 2 higher than the cutout pressure P o 1 is set (P 〇 2>P 〇 1). further, 〇 2020/175 470 17 卩 (：171? 2020 /007469

When the operating rate is 2 or more, the cutout pressure is higher than the cutout pressure, and the cutout pressure is set to 0 (3). In the present embodiment, the cutout pressure is set in three stages according to the operating rate of the compressor 4, but it may be set in two stages or in four or more stages. Good. Alternatively, the cutout pressure may be continuously changed according to the operating rate of the compressor 4.

[0057] The reason why the cutout pressure ◯ is increased as the operating rate of the compresser 4 is increased will be described. Since the compressor 4 is driven according to the amount of compressed dry air in the air tank 30 and the like, when the operating rate is low, the compressed dry air consumption by the pneumatic system such as the brake system is relatively low. It is estimated that the situation is under. In such a situation, the cutout pressure is set to a relatively low value, the frequency of regenerating operation is set to be relatively high, and the filter 17 is actively cleaned. On the other hand, when the operating rate of the Compressor 4 is high, it is estimated that the compressed dry air consumption by the pneumatic system such as the brake system is relatively high. In such a situation, the cutout pressure is set to a relatively high value, the frequency of regeneration operation is performed relatively low, and the supply of compressed dry air to the pneumatic system is prioritized.

[0058] Fig. 38 shows a map 100 in which the standard regeneration air amount 80! 1 is set according to the limit ventilation amount and the cutout pressure. This map 100 is stored in the storage unit 808. The horizontal axis of the map 100 is the limit air flow rate, and the vertical axis is the standard regeneration air volume 81 01. In the figure, the unit is volume (liter), but the unit may be mass. The limit air flow rate is a value that indicates the limit of the amount of air that passes through the air drying circuit 11 and is determined according to the specifications of the air drying circuit 11 (air dryer). The standard regeneration air volume 80!1 decreases as the critical air flow rate increases, and increases as the critical air flow rate decreases. Further, the standard regeneration air volume 80!1 becomes smaller as the cutout pressure becomes higher, and becomes larger as the cutout pressure becomes lower, when the limit air flow rate is constant. In other words, the cutout pressure is set to a high value as the operating rate of the Compressor 4 increases. 〇 2020/175 470 18 卩 (: 171? 2020 /007469

Therefore, it can be said that the standard regeneration air volume of 81 1 decreases as the operating rate of the Combressa 4 increases. As mentioned above, when the operating rate of the compressor 4 is high, it is estimated that the compressed dry air consumption by the pneumatic system such as the brake system is relatively high. For this reason, when the operating rate of the compressor 4 is high, it is prioritized to reduce the standard regeneration air volume 81 and supply compressed dry air to the pneumatic system. Also, the standard regeneration air volume 1 increases as the operating rate of the compressor 4 decreases. If the operating rate is low, it is estimated that the compressed dry air consumption by the pneumatic system such as the brake system is relatively small. Therefore, when the operating rate of the compressor 4 is low, the standard regeneration air volume 0! 1 is increased to enhance the cleaning effect of the filter 17 per regeneration operation.

[0059] Fig. 3 is a map 101 showing the relationship between the corrected unit air amount 82 depending on the cutout pressure and the limit ventilation amount. This map 1 0 1 is stored in the storage unit 8 0 8. The horizontal axis is the limit air flow rate, and the vertical axis is the correction unit air volume 2. Although the unit is volume in the figure, the unit may be mass. The corrected unit air volume 0!2 becomes smaller as the limit air flow rate becomes larger like the standard regeneration air volume 0!1, but becomes larger as the cutout pressure becomes higher when the limit air volume is constant. , It becomes smaller as the cutout pressure becomes lower.

に乗算される 係数であり、 負の値、 正の値又は 「0」 に設定されている。 この過不足係数 «は、 エアタンク 3 0内に貯留された圧縮乾燥空気の湿潤状態の傾向に基づ き設定されるものである。 再生動作の過不足は、 フィルタ 1 7によって捕捉 された水分量によって判定することができるが、 圧縮空気に含まれる水分量 は空気の温度や湿度によって変化するため、 フィルタ 1 7によって捕捉され た水分量を、 再生動作の実行時間やフィルタ 1 7を通過した空気量だけを用 いて推定するのは困難である。 また、 フィルタ 1 7によって捕捉された水分 量を直接的に計測することも困難である。 本実施形態のように、 貯留部内の 〇 2020/175470 19 卩（：171? 2020 /007469 [0060] The excess/deficiency coefficient << (regeneration excess/deficiency coefficient) is the correction unit air amount.

Is a coefficient that is multiplied by and is set to a negative value, a positive value or "0". This excess/deficiency coefficient is set based on the tendency of the compressed dry air stored in the air tank 30 to be in a wet state. The excess or deficiency of the regeneration operation can be determined by the amount of water captured by the filter 17, but the amount of water contained in the compressed air changes depending on the temperature and humidity of the air, so the amount of water captured by the filter 17 can be determined. It is difficult to estimate the amount using only the execution time of the regeneration operation and the amount of air that has passed through the filter 17. It is also difficult to directly measure the amount of water captured by the filter 17. As in this embodiment, 〇 2020/175 470 19 卩(：171? 2020/007469

By determining the excess or deficiency of the regeneration operation based on the wet state of the compressed dry air, the excess or deficiency of the regeneration operation can be appropriately determined indirectly.

The tendency of the wet state, which is the basis of the excess/deficiency coefficient <<, is determined for the period from the previous reproduction operation to the next reproduction operation. In addition, the index for determining the wet state is not limited, but in the present embodiment, the saturation degree of the water content (hereinafter, the water content) contained in the compressed dry air in the air tank 30 is calculated, and the previous regeneration is performed. Subtract the saturation of the moisture content this time from the saturation of the moisture content at the end of the operation. If the saturated moisture content is higher at the end of this regeneration than at the end of the previous regeneration, that is, if the wet state of compressed dry air tends to increase, the filter 17 captures it. It is judged that the water content is increasing. Therefore, in equation (1) above, the excess/deficiency coefficient << is a negative value that is not "0". When the excess/deficiency coefficient << is a negative value, the regeneration air amount is corrected to be larger than the standard regeneration air amount.

[0062] On the other hand, if the saturation of the water content at the end of this regeneration is lower than that at the end of the previous regeneration, that is, if the wet state of compressed dry air tends to decrease, the filter 1 It is judged that the amount of water captured by 7 tends to decrease. Therefore, the excess/deficiency coefficient << is set to a positive value larger than "0", and the regenerated air amount is corrected to be smaller than the standard regenerated air amount. When it is determined that the compressed dry air is in a suitable wet state, the excess/deficiency coefficient is set to “◯” and the regenerated air amount 01 is not corrected from the standard regenerated air amount 01 1.

FIG. 4 is excess/deficiency coefficient information 200 showing an example of excess/deficiency coefficient <<. The excess/deficiency coefficient information 200 is stored in the storage unit 80. The excess/deficiency coefficient information 200 includes the excess/deficiency condition 200, and the excess/deficiency coefficient 200(3. State 2 00 0 indicates the state indicated by the excess/deficiency condition 2 0 0 for convenience. The range of regeneration excess/deficiency is set in the excess/deficiency condition 200. The regeneration excess/deficiency indicates the amount of water contained in the compressed dry air in the air tank 30. It is an index that indicates whether the degree of saturation is increasing or decreasing.

[0064] The excess/deficiency coefficient 200 (3 is the reproduction excess/deficiency multiplied by the weighting coefficient. 〇 2020/175 470 20 卩 (：171? 2020 /007469

It The excess/deficiency coefficient 103 corresponds to the excess/deficiency condition 208, which is the range of the reproduction excess/deficiency. Although the weighting coefficient is a positive integer in FIG. 4, it does not have to be a positive integer.

[0065] In the excess/deficiency coefficient information 200, when the regeneration air amount is significantly insufficient, that is, when the water content is large, the regeneration excess/deficiency degree is, for example, "_ 1" or less, which is a negative value. It is a value and its absolute value is large. In this case, the weighting coefficient is also set to a relatively large value such as “2”. In addition, if the amount of regeneration air is insufficient, even if it cannot be said to be “significantly insufficient,” the regeneration insufficient degree is, for example, greater than “_ 1” and less than “_ 0.5”. However, the absolute value is smaller than the "significant lack". Also, the value of the weighting coefficient is set to a value smaller than "significantly insufficient" such as "1".

[0066] Further, when the amount of regenerated air is significantly excessive, that is, when the water content is small, the regeneration excess/deficiency degree is, for example, "1" or more, and the positive value and absolute value are large. In this case, the weighting coefficient is also set to a relatively large value such as “2”. In addition, if the amount of regenerated air is excessive even if it cannot be said to be “significantly excessive,” the regeneration excess/deficiency is, for example, “0.5” or more, which is less than “1”. , The absolute value is smaller than that of "significant excess". Also, the value of the weighting coefficient is set to a value smaller than "significantly insufficient" such as "1".

[0067] When the reproduction excess/deficiency is in a range of, for example, "10. 5" or more and less than "0.5", the excess/deficiency coefficient is set to "0".

With respect to the regenerated air volume calculated using these standard regenerated air volume, corrected unit air volume, and excess/deficiency coefficient, the wet state in the air tank 30 is shown when the operating rate of the compressor 4 is low and high. The explanation will be made separately for the case of low and the case of high. It is assumed that the limit ventilation is constant.

[0068] (8) Comblator 4 operating rate: low, wet condition in air tank 30: high If the operating rate of the combustor 4 is low, the cutout pressure is set low. As a result, the frequency of execution of the regeneration operation and the purging operation is increased. Also the standard \\0 2020/175 470 21 (: 17 2020/007469

The regenerated air volume 1 increases as the cutout pressure is set low.

[0069] Further, the correction unit air amount 〇!2 becomes smaller by setting the cutout pressure low. Further, the excess/deficiency coefficient << becomes a "significantly insufficient" or "insufficient" state, which is a negative value, because the wet state in the air tank 30 is high. Therefore, a positive correction value is added to the standard regeneration air volume, and the regeneration air volume 01 becomes large. In addition, the amount of regeneration air in the “largely shortage” state is larger than that in the “shortage” state.

上記の状態 （ ） と 同様である。 一方、 過不足係数《は、 エアタンク 3 0内の湿潤状態が低いた め、 「大幅過剰」 又は 「過剰」 の状態となり、 正の値となる。 このため、 標 準再生空気量から補正値が減算され、 状態 （ ） の再生空気量 01に比べ、 再生空気量八 01が小さくなる。 [0070] (Mitsumi) Comblator 4 operation rate: low, air tank 30 wet condition: low

It is similar to the above state (). On the other hand, the excess/deficiency coefficient << is a "significant excess" or "excessive" state because the wet state in the air tank 30 is low, and is a positive value. Therefore, the correction value is subtracted from the standard regenerated air amount, and the regenerated air amount 801 becomes smaller than the regenerated air amount 01 in the state ().

[0071] (○ Comblator 4 operating rate: high, wet condition in air tank 30: high When the operating rate of the compressor 4 is high, the cutout pressure is set high. In addition, the standard regeneration air volume 81 becomes smaller due to the higher cutout pressure.

[0072] Further, the correction unit air amount 82 is increased by setting the cutout pressure high. Further, the excess/deficiency coefficient << becomes a "significantly insufficient" or "insufficient" state, which is a negative value, because the wet state in the air tank 30 is high. For this reason, a positive correction value is added to the standard regenerated air amount, but the regenerated air amount ◯! becomes smaller than the regenerated air amount in state (). It should be noted that the regenerated air amount 01 in the state (○) may be smaller or larger than the regenerated air amount 01 in the state (Min). Also, the regenerated air amount 0 in the state (Min) and the state (The regeneration air volume in (3) 801 may be the same.

[0073] (0) Comblator 4 operating rate: high, wet condition in air tank 30: low 〇 2020/175 470 22 卩 (：171? 2020 /007469

The standard regeneration air volume ◯! 1 and the correction unit air volume 0^2 are the same as the above conditions (◯). On the other hand, the excess/deficiency coefficient << is because the wet state in the air tank 30 is low, "Or" Excess" and becomes a positive value. Therefore, the correction value is subtracted from the standard regenerated air amount, and the regenerated air amount becomes smaller than the regenerated air amount 0! in the state (<3). In other words, depending on the set value of the excess/deficiency coefficient, basically, the regenerated air volume 0! is the largest in the state () and the smallest in the state (mouth).

[0074] (Control of air drying circuit 11)

Next, with reference to FIG. 5 to FIG. 7, the procedure by which the control unit 80 controls the air drying circuit 11 will be described.

[0075] With reference to Fig. 5, an overall control procedure will be described. The MII II 80 performs the air supply process of supplying the compressed air output from the compressor 4 to the supply circuit 12 (step 31). The air supply process is started under predetermined conditions such as when the engine is driven. The air supply process may be started when the pressure in the air tank 30 reaches a predetermined pressure such as the cut-in pressure which is the lower limit value. In the air supply process, the air drying circuit 11 is in the first operation mode and is performing the dehumidifying operation.

[0076] When the air supply process is started, the day (3 1 180) determines whether or not to stop the air supply (step 3 2). The pressure in the air tank 30 detected by the sensor 5 3 is acquired and it is determined whether or not the pressure reaches the cutout pressure.MII 〇 II 80 indicates that the pressure in the air tank 30 is the cutout pressure. When it is judged that the temperature has not reached (step 32: N0), the process is returned to the air supply process (step 31).

[0077] When it is judged that the pressure in the air tank 30 has reached the cutout pressure (Step 3 2 :Mimi 3), the Ⅱ II 80 finishes the air supply process and puts the compressor 4 into the non-operational state. And perform the purification process (step 33). In the cleaning process, the (311800 determines whether or not the regenerating operation and the purging operation are necessary according to the preset conditions. 〇 2020/175 470 23 卩 (：171? 2020 /007469

Execute the operation and execute the purge operation when it is determined that the purge operation is necessary

[0078] When the cleaning process (step 33) is completed, the process (31180 performs the air non-supplying process (step 34).) In the air non-supplying process, the upstream check valve is operated when the compressor 4 is in the non-operating state. Adjust the pressure of the air drying circuit 11 such as adjusting the back pressure of 15. For example, in the air non-supply process, at least one of the second operation mode, the fifth operation mode, and the sixth operation mode is set to 1 to Execute multiple times to adjust the air pressure in the air drying circuit 11. When the pressure adjustment is completed, º01\80 determines whether or not to stop the air supply based on the vehicle condition (step 35). ) The end of the air supply is determined based on the vehicle state such as the engine stop of the vehicle.

[0079] When it is determined that the air supply is not terminated (step 35: N0), º0^8

If 0, the process is returned to step 31, and the following processes of the air supply process (step 31) are executed. On the other hand, when it is determined that the air supply is to be ended (step 35: No. 3), the air supply is stopped.

Next, with reference to FIG. 6, a procedure of controlling the reproducing operation will be described. Mitsu 118

A value of 0 determines whether or not a reproducing operation is necessary according to a predetermined condition (step 3100). At this time, Min 1180 determines whether or not the regenerating operation is necessary based on the wet state of the compressed dry air in the air tank 30. For example, the MII II 80 calculates the amount of water contained in the compressed dry air in the air tank 30 (the amount of water contained in the tank). If the water content in the tank is less than the predetermined value, it is determined that the regenerating operation is unnecessary.

[0081] Michi 1180 judges that the reproducing operation is not necessary (step 31 00

:N0), end the process. On the other hand, when Mitsumi (31180 determines that the regeneration operation is necessary (Step 31 00: Mimi 3), the determined amount of regeneration air is acquired (Step 31 01). Switch the air drying circuit 1 1 to the 3rd operation mode by using the regenerated air volume and execute the regenerating operation. 〇 2020/175 470 24 卩 (: 171? 2020 /007469

(Step 3 102). Here, the change in the pressure value detected by the pressure sensor 53 is converted into the amount of air consumed in the regenerating operation, and even if the regenerating operation is terminated when the converted air amount reaches the regenerating air amount. Good. Alternatively, the regenerating operation may be performed by switching the air drying circuit 11 1 to the third operation mode for the regenerating time corresponding to the regenerated air amount. The regeneration time is calculated using a map that associates the regeneration air amount with the regeneration time, or is calculated using a conversion formula assuming that the amount of air per unit time that passes through the filter 17 during regeneration is constant. You may do it. When the regeneration operation is completed, the purification process (step 33) is completed and the process proceeds to the next step.

Next, with reference to FIG. 7, a process for determining the regeneration air amount will be described. In addition, day (3 1 180) is defined as one cycle from the end of the regenerating operation to the start of the next regenerating operation. Then, the regenerated air amount is updated at a predetermined timing in one cycle. The update timing of the amount is not particularly limited, for example, the update of the regeneration air amount may be performed at the start of one cycle,

It may be performed at the end of one cycle, between the start and end of one cycle, or at regular intervals such as a period shorter than the average time of one cycle. You may be broken.

[0083] The M1 1 180 determines whether or not the regeneration air amount is updated (step 3 1

Ten) . For example, Minao II 80 determines whether or not the predetermined timing of the new cycle has been reached. If the MII II 80 determines that the predetermined timing has not been reached (step 311 0: N 0), it ends the process.

[0084] When the MI II 80 determines to update the regeneration air amount (step 311 0: Mimi 3), the regeneration excess/deficiency is calculated (step 3 1 1 1). The regeneration excess/deficiency may be calculated based on the change in the tank air moisture saturation, as described above. The tank air moisture saturation can be calculated from the humidity detected by the humidity sensor 51, the temperature detected by the temperature sensor 52, and the like.

[0085] Mitsumi (3 1 180 obtains the excess/deficiency factor by using the excess/deficiency factor information 2 0 0 after calculating the reproduction excess/deficiency (step 3 1 1 2). 0 is 〇 2020/175 470 25 卩 (：171? 2020 /007469

Obtain the cutout pressure, which is the start pressure of the regenerating operation (step 3 1 1 3)

.. In addition, based on the cutout pressure acquired, Min. 1180 acquires the standard amount of regenerated air using map 100 (step 3 1 1 4) and the correction unit using map 1 0 1. Get the air volume (step 3 1 1 5). Then, MII II 80 calculates the amount of regenerated air according to the above equation (1) using the standard amount of regenerated air, the corrected unit air amount, and the excess/deficiency coefficient (steps 3 1 1 6). The regenerated air amount calculated here is used in step 3101 of FIG. The tan 80 performs a regeneration operation using the regeneration air amount calculated here.

As described above, according to the first embodiment, the following effects can be obtained.

(1) MI (3 1 180 sets the amount of regenerated air consumed in the regenerating operation based on the operating state of the compressor 4. The compressor 4 is compressed dry air to the pneumatic system other than the air drying circuit 1 1. It is driven according to the supply state of the air conditioner.Therefore, by changing the amount of regenerated air, it is possible to give priority to either the supply of compressed dry air from the air tank 30 to the other pneumatic systems or the cleaning of the filter 17. You can

(2) When the operating rate of the compressor 4 is high and the supply of compressed dry air from the air tank 30 to the pneumatic system is large, the amount of regenerated air is reduced to store the air in the air tank 30. It is possible to reduce the consumption of compressed dry air that has been stored and to give priority to the supply of compressed dry air to the pneumatic system. Further, when the operating rate of the compressor 4 is low and the supply of compressed dry air from the air tank 30 to the pneumatic system is small, the cleaning of the filter 17 can be prioritized.

(3) When the compressed dry air in the air tank 30 has a high wet state, the cleaning of the filter 17 can be prioritized by increasing the amount of regenerated air. Further, when the wet state of the compressed dry air is low, it is possible to give priority to the supply of the compressed dry air to the pneumatic system by suppressing the consumption of the compressed dry air stored in the air tank 30.

[0089] (4) Upper limit for starting the playback operation according to the operating state of the comblator 4 〇 2020/175 470 26 卩 (：171? 2020 /007469

The cutout pressure, which is the pressure, is set, and the amount of regenerated air is determined according to the cutout pressure. When the operating rate of the compressor 4 is high, the cutout pressure is set high and the amount of regenerated air is reduced, so that the frequency of regenerating operation is reduced and the consumption of compressed dry air stored in the air tank 30 is reduced. Can be suppressed and the supply of compressed dry air to the pneumatic system can be prioritized. When the operating rate of the compressor 4 is low, the cutout pressure is set low and the amount of regenerated air is increased.Therefore, the frequency of regenerating operation should be increased to enhance the effect of purifying the filter 17. You can

[0090] (Second Embodiment)

The second embodiment will be described with reference to FIGS. 8 and 9. The second embodiment is similar to the first embodiment in that the standard regeneration air amount and the correction unit air amount are changed according to the state of the air drying circuit 11 to calculate the regeneration air amount. Further, in the first embodiment, the standard regeneration air amount and the correction unit air amount are changed according to the cutout pressure, but in the second embodiment, the standard regeneration air amount and the correction unit air amount are changed according to the temperature of the compressed dry air. It differs from the first embodiment in that the unit air amount is changed. Therefore, in the following, the configuration different from that of the first embodiment will be mainly described in detail, and the detailed description of the same configuration will be omitted for convenience of description.

FIG. 8 is a map 110 in which the standard regeneration air amount 1 is set according to the limit ventilation amount and the temperature, and is stored in the storage unit 808. Map 110 determines the standard regeneration air amount according to the cutout pressure, while map 110 (see FIG. 3) of the first embodiment determines the standard regeneration air amount according to the temperature. The points that have been decided are different. As the temperature, the value detected by the temperature sensor 52 can be used. Alternatively, a temperature sensor may be provided on the inlet side of the air drying circuit 11 and upstream of the filter 17 and the temperature detected by the temperature sensor may be used. The standard regeneration air volume 1 becomes smaller as the temperature becomes lower and becomes larger as the temperature becomes higher, when the limit ventilation volume is fixed. In other words, when the temperature is high, the saturated water vapor content (saturated water vapor pressure) of the air increases, so that the amount of water contained in the compressed air also tends to increase. Therefore, it is captured in filter 17 〇 2020/175 470 27 卩 (：171? 2020 /007469

Since it is assumed that the amount of water that is retained will also increase, the standard regeneration air amount 1 is increased to enhance the effect of removing moisture from the filter 17 in one regeneration operation. In addition, when the temperature is low, the amount of saturated steam in the air (saturated steam pressure) becomes small, so that the amount of water contained in the compressed air tends to decrease. Therefore, it is assumed that the amount of water trapped in the filter 17 will also decrease. Reduce.

[0092] Fig. 8 is a map 11 1 in which the correction unit air amount 〇! 2 is set according to the limit ventilation amount and the temperature, and is stored in the storage unit 808. Since the correction unit air volume 82 is a value subtracted from the standard regeneration air volume 1, as the standard regeneration air volume 8! At that time, it becomes smaller as the temperature rises and becomes larger as the temperature falls.

Next, with reference to FIG. 9, a process for determining the regeneration air amount will be described. The process for determining the amount of regenerated air in the second embodiment is common to steps 311 10 to 3 1 1 2 and steps 3 1 1 4 to 3 1 1 6 of the process of the first embodiment. Detailed description is omitted.

[0094] In step 3120, Mino 1180 obtains the temperature of the compressed dry air detected by the temperature sensor 52 (step 3120). Then, M. 1 1 180 obtains the standard amount of regenerated air by using the obtained temperature and map 1 110 (step 3 1 1 1 4). In addition, MII II 80 uses the acquired temperature and map 1 1 1 1 to acquire the corrected unit air amount (step 3 1 1 5). Then, MII II 80 calculates the amount of regenerated air using the standard amount of regenerated air, the corrected unit air amount, and the excess/deficiency coefficient (steps 311 and 6).

[0095] In the second embodiment, the following effects can be obtained.

(5) MI (3 1 180 sets the amount of regeneration air consumed in regeneration operation according to the temperature of compressed air or the temperature of compressed dry air. The temperature of compressed air or the temperature of compressed dry air rises. Then, the amount of water contained in the air also increases, 〇 2020/175 470 28 卩 (：171? 2020 /007469

By changing the amount of regenerated air depending on the amount of water contained, it is possible to give priority to either the supply of compressed dry air from the air tank 30 to the pneumatic system or the cleaning of the filter 17.

[0096] (6) When the temperature of air is low and the amount of saturated steam is small, the amount of regenerated air is reduced to suppress the consumption of compressed dry air stored in the air tank 30 and transfer it to the pneumatic system. The compressed dry air supply can be prioritized. When the temperature of air is high and the amount of saturated water vapor is large, the amount of regenerated air can be increased to prioritize the cleaning of the filter 17.

The above-described embodiments can be implemented with the following modifications. The above-described embodiments and the following modifications can be implemented in combination with each other within a technically consistent range.

In the first embodiment, the regeneration air amount is determined according to the regeneration excess/deficiency, but the regeneration time may be determined according to the regeneration excess/deficiency. In this case, the corrected playback time is calculated by multiplying the corrected unit time by the excess/deficiency coefficient, and the corrected playback time is added to the standard playback time.

In the first embodiment, the excess/deficiency coefficient << is calculated by multiplying the reproduction excess/deficiency degree by a weighting coefficient, but the reproduction excess/deficiency degree itself may be used as the excess/deficiency coefficient <<. Even in this case, the amount of regenerated air can be increased or decreased depending on the excess or deficiency of regeneration.

In the first embodiment, the regeneration excess/deficiency is an index indicating whether the saturation of water contained in the compressed dry air in the air tank 30 has an increasing tendency or a decreasing tendency. The humidity may be used as an index instead of the regeneration excess/deficiency. Further, the water content in the tank may be used as an index instead of the excess or deficiency of regeneration.

[0100] As the regeneration excess/deficiency in the first embodiment, an average value over several cycles may be used. If the average value is a negative value, it is estimated that the amount of water in the air tank 30 has increased, so it is determined that the amount of regenerated air is insufficient.

[0101] In the first embodiment, the cutout pressure is set according to the operating rate of the compressor 4. 〇 2020/175 470 29 卩 (：171? 2020 /007469

The standard regeneration air amount and the correction unit air amount that constitute the regeneration air amount were set according to the cutout pressure. In addition to this mode, the standard regeneration air amount and the correction unit air amount may be set using a map or the like in which the operating rate of the compressor 4 is associated with the standard regeneration air amount and the correction unit air amount.

[0102] In the second embodiment, the standard regeneration air amount and the correction unit air amount are set according to the temperature. In addition to this mode, the standard regeneration air amount and the correction unit air amount may be set by using the temperature and the humidity. Alternatively, the standard regeneration air amount and the correction unit air amount may be set by using only the humidity detected by the humidity sensor 51 or the like.

[0103] In each of the above embodiments, when the compressed dry air in the air tank 30 is in a high wet state, the excess/deficiency coefficient is set to a negative value to increase the amount of regenerated air, and the compressed dry air in the air tank 30 is in a wet state. When is low, the excess/deficiency coefficient is set to a positive value to reduce the amount of regenerated air. In addition to this mode, the amount of regenerated air may be changed by using the wet state of the compressed dry air sent from the combiner 4 or the wet state of the outside air.

[0104] The regeneration air amount may be determined based on the cutout pressure and the temperature of the compressed air or the compressed dry air. In this embodiment, a map in which cutout pressure, temperature, and standard regeneration air amount are associated with each other, a map in which cutout pressure, temperature, and correction unit air amount are associated with each other are used.

In each of the above embodiments, the standard regeneration air amount is corrected by the correction amount obtained by multiplying the correction unit air amount by the excess/deficiency coefficient to calculate the regeneration air amount, but the regeneration air amount is directly calculated from the map or the like. It may be calculated as follows. In this case, the map may correspond to cutout pressure (or temperature), an index showing the wet state of compressed dry air, and the amount of regenerated air.

In each of the above embodiments, the filter 17 includes an oil trap,

The oil trap may be omitted from 17.

The air drying circuit is not limited to the one having the above configuration. The air drying circuit need only have a configuration capable of performing the dehumidifying operation and the regenerating operation. Therefore, the air drying circuit must have the second operation mode and the fourth to sixth operation modes. 〇 2020/175 470 30 boxes (: 171-1? 2020 /007469

Is not intended to be the behavior of.

[0107] In each of the above embodiments, the air supply system 10 has been described as being installed in a vehicle such as a truck, a bus, or a construction machine. As an aspect other than this, the air supply system 10 may be mounted on another moving body such as a passenger car, a railway vehicle, or the like.

[0108] The ECU 80 is not limited to the software processing for all the processing executed by itself. For example, the ECU 80 may include a dedicated hardware circuit (for example, an application specific integrated circuit: AS IC) that performs hardware processing for at least a part of the processing performed by the ECU 80. In other words, the EC U 80 consists of 1) one or more processors that operate according to a computer program (software), 2) one or more dedicated hardware circuits that perform at least some of the various processes, or 3 ) A combination of them can be configured as a circuit including. The processor includes a CPU and memories such as RAM and ROM, and the memory stores program code or instructions configured to cause the CPU to perform a process. Memory or computer-readable media includes any available media that can be accessed by a general purpose or special purpose computer.

Explanation of symbols

[0109] 4 Compressors, 10 Air Supply System, 1 1 Air Drying Circuit, 1 2 Supply Circuit, 1 5 Upstream Check Valve, 1 6 Branch Passage, 1 7 Filter, 1 8 Air Supply Passage, 1 9 Downstream Check Valve, 20 bypass channels,

2 1 Regeneration control valve, 22 orifice, 25 drain discharge valve, 26 A governor, 26 B unload control valve, 27 drain discharge port, 30 storage air tank, 50 pressure sensor, 5 1 humidity sensor , 52 temperature sensor, 53 pressure sensor, 80 ECU, 80 A memory, E 61 to E 67 wiring.

Claims

〇 2020/175 470 31 卩(：171? 2020/007469 Claims [Claim 1] An air drying circuit, which is provided between a compressor for delivering compressed air and a storage section for storing compressed dry air, and has a filter for trapping moisture. A control device for controlling the air drying circuit, The control device is Controlling the air drying circuit so as to perform a dehumidifying operation in which the compressed air sent from the compressor is passed through the filter in the forward direction and is supplied to the storage section; Controlling the air drying circuit to execute a regeneration operation in which the compressed dry air stored in the storage section is passed through the filter in the reverse direction and the fluid passing through the filter is discharged from an outlet, An air supply system configured to set the amount of regeneration air consumed in one regeneration operation according to the operating state of. [Claim 2] The control device is When the operating rate of the compressor is high within a certain period of time, the regeneration air amount is reduced, and when the operating rate of the compressor is low, the regeneration air amount is increased. The air supply system according to claim 1. [Claim 3] The control device is When the index indicating the wet state of the compressed dry air in the reservoir is high, the amount of the regenerated air is increased, and when the index indicating the wet state of the compressed dry air in the reservoir is low, the regenerated air is Configured to reduce volume, The air supply system according to claim 1 or 2. [Claim 4] The control device is If the operating rate of the compressor is high, the pressure in the storage unit 〇 2020/175 470 32 卩 (：171? 2020 /007469 Therefore, the upper limit pressure for starting the regeneration operation is set high, and when the operating rate of the compressor is low, the upper limit pressure is set low, It is configured such that when the upper limit pressure is high, the regeneration air amount is decreased, and when the upper limit pressure is low, the regeneration air amount is increased. Air supply system. [Claim 5] An air drying circuit, which is provided between a compressor for delivering compressed air and a storage unit for storing compressed dry air, and has a filter for capturing water, A control device for controlling the air drying circuit, The control device is Controlling the air drying circuit so as to perform a dehumidifying operation in which the compressed air sent from the compressor is passed through the filter in the forward direction and is supplied to the storage section; Controlling the air drying circuit to execute a regeneration operation of passing the compressed dry air stored in the storage section through the filter in the reverse direction and discharging the fluid that has passed through the filter from an outlet; An air supply system configured to set the amount of regenerated air consumed in one regeneration operation according to the temperature of air or the compressed dry air. [Claim 6] The control device is The air supply system according to claim 5, wherein when the temperature is low, the regeneration air amount is reduced, and when the temperature is high, the regeneration air amount is increased. [Claim 7] An air drying circuit provided between a compressor for delivering compressed air and a storage section for storing compressed dry air, having a filter for trapping moisture, and a control for controlling the air drying circuit A method for controlling an air supply system including a device 〇 2020/175 470 33 卩(：171? 2020/007469 The control device is Controlling the air drying circuit so as to perform a dehumidifying operation in which the compressed air sent from the compressor is passed through the filter in the forward direction and is supplied to the storage section; Controlling the air drying circuit to execute a regeneration operation in which the compressed dry air stored in the storage section is passed through the filter in the reverse direction and the fluid passing through the filter is discharged from an outlet, Depending on the operating state of, the amount of regeneration air consumed in one regeneration operation is set. Air supply system control method. [Claim 8] An air drying circuit provided between a compressor for delivering compressed air and a storage section for storing compressed dry air, having a filter for trapping moisture, and a control for controlling the air drying circuit A method for controlling an air supply system including a device The control device is Controlling the air drying circuit so as to perform a dehumidifying operation in which the compressed air sent from the compressor is passed through the filter in the forward direction and is supplied to the storage section; Controlling the air drying circuit to execute a regeneration operation of passing the compressed dry air stored in the storage section through the filter in the reverse direction and discharging the fluid that has passed through the filter from an outlet; According to the temperature of the air or the temperature of the compressed dry air, set the amount of regeneration air consumed in one regeneration operation, Air supply system control method. [Claim 9] An air drying circuit provided between a compressor for delivering compressed air and a storage section for storing compressed dry air, having a filter for trapping moisture, and a control for controlling the air drying circuit And a control program for an air supply system including 〇 2020/175 470 34 卩 (: 171? 2020 /007469 The control device, A dehumidification operation execution unit that controls the air drying circuit to execute a dehumidification operation in which the compressed air sent from the compressor is passed through the filter in the forward direction and is supplied to the storage unit; Execution of a regeneration operation that controls the air drying circuit to perform a regeneration operation in which the compressed dry air stored in the storage section is passed through the filter in the reverse direction and the fluid that has passed through the filter is discharged from an outlet. Department, and A setting unit for setting the amount of regeneration air consumed in one regeneration operation according to the operating state of the compressor, Air supply system control program. [Claim 10] An air drying circuit provided between a compressor for delivering compressed air and a storage section for storing compressed dry air, having a filter for trapping moisture, and a control for controlling the air drying circuit A control program for an air supply system comprising The control device, A dehumidification operation execution unit that controls the air drying circuit to execute a dehumidification operation in which the compressed air sent from the compressor is passed through the filter in the forward direction and is supplied to the storage unit; The air drying circuit is controlled so that the compressed dry air stored in the storage section is passed through the filter in the reverse direction and the fluid that has passed through the filter is discharged from the discharge port. A regeneration operation execution unit that controls the air drying circuit, and A setting unit that sets the amount of regeneration air consumed in one regeneration operation according to the temperature of the compressed air or the temperature of the compressed dry air. Air supply system control program.