WO2020175468A1 - 空気供給システム、空気供給システムの制御方法、及び空気供給システムの制御プログラム - Google Patents
空気供給システム、空気供給システムの制御方法、及び空気供給システムの制御プログラム Download PDFInfo
- Publication number
- WO2020175468A1 WO2020175468A1 PCT/JP2020/007467 JP2020007467W WO2020175468A1 WO 2020175468 A1 WO2020175468 A1 WO 2020175468A1 JP 2020007467 W JP2020007467 W JP 2020007467W WO 2020175468 A1 WO2020175468 A1 WO 2020175468A1
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- WO
- WIPO (PCT)
- Prior art keywords
- air
- compressor
- filter
- drying circuit
- compressed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/002—Air treatment devices
- B60T17/004—Draining and drying devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/261—Drying gases or vapours by adsorption
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/45—Gas separation or purification devices adapted for specific applications
- B01D2259/4566—Gas separation or purification devices adapted for specific applications for use in transportation means
Definitions
- Air supply system control method of air supply system, and control program of air supply system
- the present disclosure relates to an air supply system, an air supply system control method, and an air supply system control program.
- 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.
- the cleaning function of the compressed air dryer decreases with the passage of compressed dry air. Therefore, the compressed air drying device performs a regenerating operation of removing the oil and water adsorbed by the desiccant from the desiccant, and discharging the removed oil and water as drain (for example, see Patent Document 1).
- Patent Document 1 Japanese Unexamined Patent Publication No. 2 0 1 0 _ 2 0 1 3 2 3
- the compressed air drying device of the part is stored in the compressed air sent from the compressor driven by the rotary drive source such as the engine or stored in the storage part for the purpose other than dehumidification like the above-mentioned regeneration operation. Performs a discharge operation that consumes compressed dry air. Such discharging operation increases the load on the rotary drive source to some extent. On the other hand, in recent years, it has been required to improve the fuel efficiency of vehicles. For this reason, improvements are required to maintain the dehumidification function of the compressed air drying device while suppressing the consumption of compressed air or compressed dry air.
- An object of the present disclosure is to maintain good dehumidification function of the air drying circuit while suppressing air consumption for purposes other than dehumidification by the air drying circuit.
- 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 is passed in the reverse direction to the filter and the fluid that has passed through the filter is discharged from the discharge port.
- Control unit to acquire operation information indicating the operation state of the compressor, and change the execution frequency of the filter cleaning operation based on the acquired operation information of the compressor.
- 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.
- a method for controlling an air supply system comprising a circuit and a control device for controlling the air drying circuit, wherein the control device causes the compressed air sent from the compressor to pass through the filter in a forward direction. Controlling the air drying circuit so as to perform a dehumidifying operation of supplying the compressed dry air to the filter in a reverse direction.
- 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.
- Dehumidifying operation executing section for controlling the air drying circuit so as to execute the dehumidifying operation for supplying to the storage section, the compressed dry air is passed through the filter in the reverse direction, and the fluid passing through the filter is discharged from the outlet.
- the filter cleaning operation execution unit that controls the air drying circuit to execute the filter cleaning operation that discharges the air from the acquisition unit, the acquisition unit that acquires the operation information indicating the operation status of the compressor, and the acquired operation information of the compressor. Based on this, the filter functions as a changing unit that changes the execution frequency of the cleaning operation.
- the control device changes the frequency of the filter cleaning operation based on the operation information of the compressor. In other words, if the control device determines that it is necessary to give priority to the compressed dry air from the storage unit to the devices other than the air drying circuit based on the operating state of the compressor, the frequency of the filter cleaning operation is set. Can be lowered. Further, when the control device determines that the filter needs to be cleaned based on the operating state of the compressor, the frequency of the filter cleaning operation can be increased. ⁇ 0 2020/175468 4 (:170? 2020/007467
- the control device determines that the operating state of the compressor is the second operating state based on the operating information, the control device performs the filter cleaning operation more than the first operating state.
- the amount of air delivered from the compressor in the second operating state within a certain period of time may be equal to the amount of air delivered from the compressor in the first operating state within the certain period of time. May be larger than.
- the operating state of the compressor is the second operating state
- the amount of air passing through the filter also increases and, as a result, the amount of water captured by the filter also increases.
- the temperature of the compressed air sent from the compressor rises, and the amount of water contained in the compressed air also tends to increase.
- the frequency of the discharging operation is increased, so that the water captured by the filter can be discharged with high frequency. For this reason, the dehumidification performance of the filter can be favorably maintained.
- control device may be configured not to perform the filter cleaning operation when it is determined that the working state of the compressor is the third operating state, and the third operating state In the state, the amount of air delivered from the compressor in a certain period may be larger than the amount of air delivered from the compressor in the certain period in the second operating state.
- the filter cleaning operation is not executed when the compressor is in the third operating state. Therefore, in a situation where the amount of compressed dry air consumed by a device other than the air drying circuit is large, the operation mode cannot be switched to the filter cleaning operation, so that the compressed dry air can be continuously supplied to the device.
- the air drying circuit branches from a connection passage connecting the compressor and the filter, a supply passage through which the compressed dry air passing through the filter passes, and a connection passage.
- a discharge valve connected to the branch passage, the discharge valve performing a discharge operation for discharging the fluid that has passed through the filter by communicating the branch passage with the discharge port; ⁇ 0 2020/175468 5 ⁇ (: 170? 2020 /007467
- the control device controls the air drying circuit so as to perform, as the filter cleaning operation, a purge operation of opening the discharge valve and allowing compressed dry air in the air drying circuit to pass through the filter in the reverse direction.
- the control device may be configured to change the frequency of the purge operation based on the operation information of the compressor.
- the frequency of the purging operation can be changed based on the operating state of the compressor.
- the control device acquires the water content of the compressed dry air supplied to the storage unit, and determines to execute the purge operation when the water content is equal to or more than a threshold value.
- the threshold value may be set to be lower when the operating state of the compressor is the second operating state than when the operating state of the compressor is not the second operating state.
- the threshold value of the water content is changed based on the operating state of the compressor, the compressed air in a highly wet state is sent from the compressor, and the filter captures a large amount of water, Even if the compressed dry air that has passed through the filter is in a significantly low-humidity state, the purge operation can be easily performed. Therefore, the frequency of the page operation can be optimized.
- the control device determines that the operating state of the compressor is the second operating state based on the operating information
- the execution frequency of the filter cleaning operation is higher than that of the first operating state. May be configured to be lower, and the amount of air delivered from the compressor in the second operating state may be greater than the amount of air delivered from the compressor in the first operating state.
- the air drying circuit branches from a connection passage connecting the compressor and the filter, a supply passage through which the compressed dry air that has passed through the filter passes, and a connection passage.
- a discharge valve that is connected to the branch passage, and executes a discharge operation of discharging the fluid that has passed through the filter by communicating the branch passage with a discharge port; and the control device,
- the air drying circuit may be controlled so as to perform a regeneration operation of opening the discharge valve and allowing compressed dry air in the storage portion to pass through the filter in the reverse direction.
- the frequency of the reproduction operation may be changed based on the operation information of the compressor.
- the frequency of the regenerating operation is changed, so that, for example, priority is given to supplying compressed dry air to devices other than the air drying circuit. Can be made.
- 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 operation information indicating the operation state of the compressor may be acquired, and the execution frequency of the oil discharge operation may be changed based on the acquired operation information of the compressor.
- 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.
- a circuit, and a control device for controlling the air drying circuit comprising: a control device for controlling the compressed air sent from the compressor to the filter.
- the frequency of the oil content discharging operation based on the step of controlling the air drying circuit to execute the oil content discharging operation, the step of acquiring the operation information indicating the working state of the compressor, and the acquired operation information of the compressor. Perform the steps to change and.
- An air supply system control program for solving the above-mentioned problems is provided between a compressor for sending compressed air and a storage section 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 causes compressed air sent from the compressor to pass through the filter in a forward direction.
- Dehumidifying operation executing section for controlling the air drying circuit so as to execute the dehumidifying operation for supplying to the storage section, the oil content exhausted from the outlet without passing the compressed air sent from the compressor to the filter.
- a discharge operation execution unit that controls the air drying circuit to execute a discharge operation, an acquisition unit that acquires operation information indicating an operation state of the compressor, and an oil discharge operation based on the acquired operation information of the compressor. It functions as a change part that changes the execution frequency of.
- the control device changes the frequency of oil discharge operation based on the operation information of the compressor. In other words, if the control device determines that the supply of compressed dry air from the storage unit to devices other than the air drying circuit needs to be prioritized based on the operating state of the compressor, the frequency of oil discharge operation will be reduced. can do.
- the control device is ⁇ 0 2020/175468 8 ⁇ (: 170? 2020 /007467
- the compressed air containing a large amount of oil can be discharged without passing through the filter, and the load on the filter can be reduced.
- the control device determines, based on the operation information, an execution frequency of the oil content discharging operation rather than a first operation state when it is determined that the operation state of the compressor is the second operation state.
- the amount of air delivered from the compressor in the second operating state within a certain period of time may be greater than the amount of air delivered from the compressor in the certain period of time in the first operating state. May be large.
- control device may be configured not to perform the oil discharge operation when it is determined that the operating state of the compressor is the third operating state.
- the amount of air delivered from the compressor within a certain period in the three operating states may be larger than the amount of air delivered from the compressor within the one period in the second operating state.
- the filter cleaning operation is not executed when the compressor is in the third operating state. Therefore, when the amount of compressed dry air consumed is large, the operation mode is not switched to the discharge operation, and therefore compressed dry air can be continuously supplied.
- the control device acquires an operating time and a non-operating time of the compressor as an operating state of the compressor, and acquires ⁇ 0 2020/175468 9 ⁇ (: 170? 2020/007467
- the operating rate of the compressor may be calculated based on the operating time and the non-operating time.
- the dehumidification function of the air drying circuit can be favorably maintained while suppressing the consumption of air for purposes other than the dehumidification by the air drying circuit.
- FIG. 1 A configuration diagram showing a schematic configuration of an embodiment of an air supply system.
- Figs. 28 to 2 are views showing first to sixth operation modes of the air drying circuit of the embodiment of Fig. 1, respectively.
- FIG. 3 A schematic diagram of start threshold information of the embodiment of FIG. 1.
- FIG. 4 A flow chart showing an example of a procedure for supplying compressed air in the embodiment of Fig. 1.
- FIG. 5 A flow chart showing an example of a procedure for updating a start threshold value in the embodiment of FIG. 1.
- FIG. 6 is a flowchart showing an example of the procedure of the purification process in the embodiment of FIG.
- FIG. 7 is a flow chart showing an example of the procedure of the oil cut operation in the embodiment of FIG.
- FIGS. 1 to 7 An embodiment of an air supply system will be described with reference to FIGS. 1 to 7.
- the air supply system is installed in vehicles such as trucks, buses, and construction machinery.
- the compressed dry air generated by the air supply system is used, for example, in a pneumatic system such as a brake system (braking device) or a suspension system (suspension device).
- a pneumatic system such as a brake system (braking device) or a suspension system (suspension device).
- Air supply system 10 will be described with reference to FIG. Air supply system ⁇ 02020/175468 10 ⁇ (: 170? 2020 /007467
- the system 10 is provided with a combiner 4, an air drying circuit 11 and an ECU (Elec t r o n i c Co n t r o l U n i t) 80 as a control device.
- ECU Electronic t r o n i c Co n t r o l U n i t
- the ECU 80 is connected to the air drying circuit 11 via a plurality of wirings E61 to E67.
- 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.
- 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.
- the ECU 80 is connected to another ECU (not shown) mounted on the vehicle, for example, an engine ECU, a brake ECU, or the like, 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.
- 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 supplied (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.
- 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 compressed air after being dried (hereinafter, compressed dry air) to the supply circuit 12 ⁇ 0 2020/175468 1 1 ⁇ (: 170? 2020 /007467
- the compressed dry air supplied to the supply circuit 12 is stored in the air tank 30.
- the compressed dry air stored in the air tank 30 is supplied to an air pressure system such as a brake system mounted on the vehicle.
- an air pressure system such as a brake system mounted on the vehicle.
- 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.
- 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.
- the air drying circuit 11 has a filter 1 inside the case 1 18 (see Fig. 28).
- 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.
- 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.
- the filter 17 removes the water contained in the compressed air from the compressed air by passing the compressed air sent from the compressor 4 through the desiccant to dry the compressed air. 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.
- a bypass for bypassing the downstream check valve 19 is provided downstream of the filter 17. ⁇ 0 2020/175468 12 (:170? 2020/007467
- a bypass flow passage 20 as a passage is provided in parallel with the downstream check valve 19.
- a regeneration control valve 21 is provided in the bypass passage 20.
- the regeneration control valve 21 is a solenoid valve controlled by a valve (3 1 180).
- the MII II 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 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.
- the regeneration control valve 21 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.
- 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.
- 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
- 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.
- Drain drain valve 25 is empty ⁇ 0 2020/175468 13 ⁇ (: 170? 2020/007467
- a pneumatically driven valve driven by atmospheric pressure which is provided in the branch passage 16 between the filter 17 and the drain outlet 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. 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.
- the drain discharge valve 25 is controlled by the governor 2 68.
- Governor 2 68 is a solenoid valve controlled by Mami 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.
- 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.
- 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.
- the drain discharge valve 25 is maintained in the closed position to shut off the branch passage 16 in the state where the pneumatic signal is not input from the governor 26, and the pneumatic signal is input from the governor 26. And the valve is opened to connect the branch passage 16 with each other.
- 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.
- the upstream check ⁇ 0 2020/175468 14 ⁇ (: 170? 2020 /007467
- a reed valve at the outlet of the compressor 4 is provided upstream of the check valve 15.
- a branch passage 16 and a filter 17 are provided downstream of the upstream check valve 15.
- the combiner 4 is controlled by the unload control valve 26.
- the unload control valve 26 is a solenoid valve controlled by ⁇ 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.
- 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.
- the state of the compressor 4 is switched to a non-operating state (idle operation) when an air pressure signal is input from the unload control valve 26.
- a non-operating state for example, when the pressure in the air tank 30 reaches the cutout pressure, it is not necessary to supply compressed dry air.
- 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 the wiring days 6 5 and 6 6. ⁇ 0 2020/175 468 15 (: 17 2020/007467
- ECU 80 determines the wet state of compressed dry air based on the humidity and temperature input from humidity sensor 51 and temperature sensor 52.
- a pressure sensor 5 is provided between the downstream check valve 19 and the supply circuit 12.
- 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.
- the air drying circuit 11 has a plurality of operation modes including at least a first operation mode to a sixth operation mode.
- the first operation mode is a mode for performing a normal dehumidifying operation (mouth operation).
- 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).
- power is not supplied to the regeneration control valve 21, the governor 26 A, and the unload control valve 26 A.
- 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.
- the filter 17 removes water and other components, and compressed air is supplied to the supply circuit 12 2. ..
- the second mode of operation is to perform a purge operation in which the compressed dry air in the air drying circuit 11 is passed through the filter 17 and the filter 17 is cleaned.
- the regeneration control valve 2 1 is closed and the unload control valve 2 6 B is set to the supply position.
- “Open”) and governor 26 A as input positions shown as “OPEN” in the figure
- power is supplied to the governor 2 6 A and unload control valve 26 B respectively.
- the port of the combustor 4 and the port of the drain discharge valve 25, which are connected to the downstream of each of them, are respectively connected to the upstream (supply circuit 12 side). (Indicated as "OFF" in the figure)
- the drain discharge valve 25 is opened.
- 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.
- the air pressure in the filter 17 and the air supply passage 18 is released to atmospheric pressure.
- the third operation mode is a mode in which the reproduction operation for reproducing the filter 17 is performed.
- the regeneration control valve 21 is opened, the governor 26 A is the input position, and the unload control valve 26 B is the supply position (indicated as “OPEN” in each figure). ).
- power is supplied to the regeneration control valve 21 in addition to the governor 26 A and the inlet control valve 26 B.
- 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.
- 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.
- the air pressure in the filter 17 and the air supply passage 18 is atmospheric pressure. ⁇ 0 2020/175468 17 ⁇ (: 170? 2020/007467
- the fourth operation mode is a mode in which the oil cutting operation is performed.
- 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.
- oil may accumulate in the compression chamber of the compressor 4.
- 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.
- the dehumidification performance of the desiccant decreases. Therefore, the oil cut operation is performed to discharge the compressed air that contains too much oil.
- 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).
- the fifth operation mode is a mode in which the compressor stops without purging.
- 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").
- compressed air or compressed dry air remaining in the desiccant of the air supply passage 18 or the filter 17 is ⁇ 0 2020/175468 18 18 (: 170? 2020/007467
- the air pressure is maintained by not discharging dry air from the drain outlet 27.
- the sixth operation mode is a mode in which an assist operation is performed for pressurization processing.
- the regeneration control valve 21 is opened, the inlet control valve 2 6B is set to the supply position (indicated as “OPEN” in the figure), and the governor 26A is set to the open position (see figure). "CLOSE").
- the compressor 4 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.
- the purging operation and the oil cutting operation maintain the good dehumidification performance of the filter 17 while consuming the compressed dry air in the air drying circuit 11 or the compressed air sent from the compressor 4 and therefore the compressor 4 Increase the operational load of. Since the compressor 4 generates compressed air by the rotational force transmitted from the rotary drive source such as the engine, the increase in the operating load of the compressor 4 increases the load of the rotary drive source, and further, the fuel such as the fuel of the vehicle. This leads to an increase in energy consumption.
- the regenerating operation is performed by the filter 1 like the purging operation and the oil cutting operation.
- the compressed dry air is consumed by the regenerating operation, so the amount of compressed dry air in the air tank 30 is increased.
- Purge action is filter 1
- the amount of water captured and held by 7 increases.
- the amount of water trapped by the filter 17 increases and the amount of trapped water exceeds the water trapping capacity of the filter 17, the wet state of the compressed dry air that has passed through the filter 17 is inevitably high. .. Therefore, the necessity of performing the purging operation is judged based on the comparison between the index indicating the wet state of the compressed dry air and its threshold value.
- the amount of water contained in the compressed dry air supplied to the air tank 30 within a certain period (hereinafter referred to as the amount of contained water) is used as an index indicating the wet state of the compressed dry air.
- the water content of the compressed dry air can be estimated from, for example, the air delivery amount (discharge amount) from the compressor 4 and the humidity detected by the humidity sensor 51 during the regenerating operation.
- the frequency is optimized.
- the ECU 80 stores the start threshold value information 100 in the storage unit 80A.
- the start threshold information 100 includes the range 101 of the operating rate R of the compressor 4 and the rank 102 associated with each of the range 101 of the operating rate R, the pressure out pressure 103, the moisture threshold 104, Including temperature threshold 105.
- Rank 102 indicates the state mode of the air drying circuit 11 and is set according to the range of the operating rate R of the compressor 4.
- the start threshold information 100 associates each range with the threshold, the start threshold information 100 may be any information as long as it can determine the start threshold from the operation rate R of the compressor 4, and its format is limited. Not done.
- the start threshold information 100 is a map in which the axis corresponding to the operating rate R, the axis corresponding to the cutout pressure, the axis corresponding to the water content threshold, and the axis corresponding to the temperature threshold correspond to each other.
- the start threshold value for each operation may be set.
- the water content threshold M th of the water content which is the basis for starting the purge operation, is set to be lower as the operating rate R of the compressor 4 is higher.
- the purge operation is easily executed, so that the execution frequency of the purge operation can be increased under certain conditions.
- the operating rate R of the compressor is equal to or higher than the predetermined value, the purging operation is prohibited, and the prohibition value is set to the water content threshold value M th.
- the water content threshold value M th 1 is set as the threshold value of the water content, and when the operation rate R is “10% or more and less than 30%”, the water content threshold value is set.
- M th 2 ( ⁇ M th 1) is set.
- the water content threshold value M th 3 «threshold value M th 2) is set.
- the operation rate R is “less than 50%”
- the water content threshold value M th 1 H igh
- the water content threshold value M th which is a medium value
- the operating rate is equal to or higher than a predetermined value (for example, 50%)
- a predetermined value for example, 50%
- the operation mode of the air drying circuit 11 is switched from the dehumidifying operation (first operation mode) to the purging operation (second operation mode) under these circumstances, the storage of compressed dry air in the air tank 30 The quantity may be insufficient. For this reason, when the operating rate is above the specified value, the compressed dry air is given priority to the pneumatic system and the purge operation is not performed.
- the compressed air sent from the compressor 4 may contain a large amount of oil, and this oil may be included in the air supply passage 18. It may pass through the flow path (charge line) between the compressor 4 and the filter 17 and adhere to the filter 17. If the oil adhered to the filter 17 is maintained, the amount of moisture captured by the desiccant decreases, and the desiccant deteriorates relatively early. Therefore, it is preferable that the oil cut operation be executed immediately after the non-operating state is switched to the operating state in order to reduce the load applied to the filter 17. When the temperature of the compressed air is high, a large amount of oil is contained in the compressed air.
- the necessity of executing the oil cutting operation is judged based on the comparison between the temperature detected by the temperature sensor 52 and its threshold value.
- setting the temperature threshold of the compressed dry air according to the operating rate of the compressor 4 optimizes the execution frequency of the oil cutting operation.
- the temperature threshold D 1 II is set lower as the operating rate of the compressor 4 is higher. However, when the operating rate of the compressor is above a specified value, the oil cut operation is prohibited and the temperature threshold value 1 is set to a prohibited value.
- utilization rate The temperature threshold is set to 11, and when the operating rate is “10% or more and less than 30%”, the temperature threshold is set to 1:2 ( ⁇ D:1: 1). ⁇ 02020/175468 22 ⁇ (: 170? 2020 /007467
- the temperature threshold T t h 3 «threshold T t h 2) is set.
- the temperature threshold T th 1 (H igh), which is a high value, and the temperature threshold T th 2 (medium value, are set in descending order of the operating rate R. Middle), and a low temperature threshold T th 3 (Low) is set.
- the oil cut operation is prohibited.
- the temperature threshold value T th is lowered as the operating rate R increases. Firstly, as the operating rate R of the compressor 4 increases, the amount of air sent from the compressor 4 also increases, so that the amount of air that passes through the filter 17 also increases, and as a result, it is captured by the filter 17. This is because it is estimated that the oil content also tends to increase. Second, the rise in the temperature of the compressed air is a factor that increases the amount of oil contained in the compressed air. Therefore, the load on the filter 17 is reduced by changing the temperature threshold T th for starting the oil cut operation according to the operating rate R and optimizing the frequency of the oil cut operation.
- the frequency of oil cut operation is increased to reduce the amount of oil retained in the filter 17, while if the frequency of operation of the compressor 4 is low, , Reduce the frequency of oil cut movements to reduce the amount of compressed air consumed by oil cut movements.
- the reason why the oil cut operation is prohibited when the operating rate R is equal to or higher than the predetermined value is the same as in the purge operation.
- the regeneration operation is performed on the assumption that the pressure in the air tank 30 is equal to or higher than the threshold cutout pressure P ⁇ . Further, the regeneration operation is started when the pressure in the air tank 30 is equal to or higher than the cutout pressure P 0 and when the amount of water in the air tank 30 is higher than the threshold value. Therefore, by changing the cutout pressure P o according to the operating rate R of the compressor 4, the execution frequency of the regeneration operation is properly adjusted.
- the cutout pressure P o is ⁇ 0 2020/175468 23 ⁇ (: 170? 2020 /007467
- a cutout pressure ⁇ 1 (!_ ⁇ %) which is a relatively low value, is set when the operating rate is “less than 50%”, and a relative value is set when the operating rate is “50% or more”.
- a high cutout pressure of 0 2 (1 to 1 1 9 ) is set (0 2> 0 1).
- the cutout pressure is set in two stages, but it may be set in three or more stages.
- the cutout pressure is increased as the operating rate increases. For example, when the operating rate is low, such as “less than 50%”, it is estimated that the compressed dry air consumption by the pneumatic system such as the brake system is relatively low. In such a situation, the cutout pressure ⁇ is set to a relatively low value, the regeneration operation is executed relatively frequently, and the filter 17 is cleaned frequently. On the other hand, if the operating rate is high, such as “50% or more”, it is estimated that the compressed dry air consumption by the pneumatic system such as the brake system is relatively high. In such situations, set the cutout pressure to a relatively high value to make the regeneration operation relatively infrequent and prioritize supplying compressed dry air to the pneumatic system.
- the MII II 80 performs an air supply step 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.
- the air drying circuit 11 is in the first operation mode.
- 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 3 is acquired, and it is judged whether or not the pressure has reached the cutout pressure. If the MI II 80 determines that the pressure in the air tank 30 has not reached the cutout pressure (step 32: N 0), the process is returned to the air supply process (step 31).
- Step 32 When it is judged that the pressure in the air tank 30 has reached the cutout pressure (Step 32: No. 3), the MII II 80 finishes the air supply process and puts the compressor 4 into the non-operational state. In addition to the above, the purification process for regenerating operation is executed (step 33).
- the air (3 1 180 performs the air non-supplying process (step 3 4).
- the air pressure is adjusted so that the back pressure of the upstream check valve 15 is maintained high.For example, in the air non-supply process, at least the second operation mode, the fifth operation mode, and the sixth operation mode are performed. Adjust the air pressure by executing one or more times 1.
- the day (3 1 180 determines whether to stop the air supply based on the vehicle condition ( Step 3 5) The end of air supply is judged based on the vehicle condition such as the engine stop of the vehicle.
- step 31 the process returns to step 31 and the air supply process (step 31) and the following processes are executed.
- step 35: No. 3 the air supply is stopped.
- the day (3 1 180 is from the end of the reproduction operation to the start of the next reproduction operation).
- the rank that is the state mode of the air drying circuit 11 is determined based on the operating rate of the compressor 4, and the cutout pressure, the moisture threshold, the temperature threshold, etc. are determined according to this rank. Set the start threshold.
- the setting of the start threshold will be described with reference to FIG. MII II 80 determines whether or not to update the start threshold value (step 3100). For example, ⁇ 0 2020/175468 25 ⁇ (: 170? 2020 /007467
- the process ends.
- the update of the start threshold value may be performed in another timing.
- the update of the start threshold value may be performed at intervals shorter than the average time of one cycle described above, at the end of one cycle, or at the start and end of one cycle. It may be done in between.
- the operating state of the compressor is the operating time (card time) and non-operating time (unload time) of the compressor 4 in one cycle.
- Mitsumi 1180 defines dehumidification operation (1st operation mode) as mouth operation, page operation (2nd operation mode), regeneration operation (3rd operation mode), oil cut operation (4th operation mode).
- the operation mode), the stop operation of the compressor without purging (fifth operation mode), and the assist operation of the compressor (sixth operation mode) are defined as unload operation.
- the time when the mouth operation is executed is stored as the mouth time 1 and the time when the unload operation is executed is stored as the unload time 2 in the storage unit 808 of the MII II 80. They are updated at a predetermined timing
- MII II 80 calculates the operating rate of the compressor 4 based on the operating state of the compressor 4 (step 3102).
- the operation rate is calculated as the ratio of the lead time Ding 1 to the sum of the lead time Ding 1 and the unloading time Ding 2 as shown in equation (1) below.
- Occupancy rate [3 ⁇ 4 (mouth time 1) / (mouth time 1 unload time 2) (1)
- the MII II 80 determines the rank of the air drying circuit 11 by using the start threshold information 100 based on the operating rate of the compressor 4 (step 3103). For example, if the operation rate of Comblator 4 is “less than 10%”, “1” is set as the rank. ⁇ 0 2020/175468 26 ⁇ (: 170? 2020 /007467
- the number 011 800 sets the start threshold for the cutout pressure, the moisture content threshold, and the temperature threshold according to the rank by using the start threshold information 100 (step 3 1 0 4). If the rank is "1”, the cutout pressure is set to “cutout pressure 0 1”, the water content threshold is set to “water content threshold IV! 1: II 1”, and the temperature threshold is set to "temperature threshold”. Ding 1: II 1” is set. These start thresholds are held until the next cycle and updated when the next cycle starts.
- the cleaning process starts when the pressure in the air tank 30 becomes equal to or higher than the cutout pressure.
- the cutout pressure is updated based on the operating rate of Comblator 4. In other words, even if the operating rate of the compressor 4 is high, if the pressure in the air tank 30 reaches the cutout pressure that is set to be relatively high, sufficient compressed dry air will be stored in the air tank 30. If so, the purification process is performed.
- Mino 1180 determines whether or not the regeneration operation of the filter 17 is necessary (step 3330).
- the condition for determining the necessity here is not particularly limited.
- Mitsumi 3 1 180, at least one of the humidity and temperature of the supply circuit 12 side is used to compress the supply circuit 12 2 side).
- the moisture content of dry air may be estimated and it may be judged that regeneration is necessary when the moisture content tends to be high.
- the amount of water contained in the compressed dry air in the air tank 30 (hereinafter referred to as the amount of water in the tank) is estimated using the obtained humidity, etc., and if the amount of water is above a threshold value, regeneration is required.
- the water content in the tank is updated every predetermined period such as every cycle, etc.
- the water content in the tank IV! Is the temperature detected by the temperature sensor 52, the saturated water vapor pressure at that temperature sensor, and the humidity detected by the humidity sensor 51. It can be calculated using the capacity of the air tank 30.
- Mii II 80 is, for example, when the water content IV! ⁇ 0 2020/175468 27 ⁇ (: 170? 2020 /007467
- step 3 3 0: ⁇ 3 When it is determined that the air drying circuit 1 1 is necessary (step 3 3 0: ⁇ 3), the air drying circuit 1 1 is switched to the third operation mode and the regeneration operation is performed (step 3 3 1).
- the regenerating operation ends when the pressure in the air tank 30 reaches the cut-in pressure, or when an end condition such as a lapse of a certain time is satisfied.
- the purification process step 33 is completed and the process proceeds to the next step.
- Step 3 30 determines that the filter 17 is not required to be regenerated in Step 3 30 (Step 3 30 :N 0)
- the moisture content of the compressed dry air is It is determined whether or not the quantity threshold IV! 1 or more (step 3 32).
- the water content threshold IV! 1:1 * 1 used at this time is updated based on the operating state of the compressor 4.
- the air drying circuit 1 1 is set to the second operation mode.
- Switch to perform the purging operation step 3 3 3)
- the water content threshold IV! 1 II is set relatively high, so the pressure in the air tank 30 is reduced. The purge operation is performed less frequently when the tough pressure is reached, and when the operating rate of the compressor 4 is high, the moisture threshold IV!
- Step 3 3 2 if it is judged that the water content is less than the water content threshold IV! I (3 1 1 800) (Step 3 3 2 :N 0), the air drying circuit 1 1 is switched to the 5th operation mode. Stop the compressor (step 3 3 4).
- the oil cutting operation is the purification process (step 33). It is executed as another process.
- the value of (3 1 180 is from the time when the previous oil cutting operation was completed. ⁇ 0 2020/175468 28 ⁇ (: 170? 2020 /007467
- the elapsed time of is stored in the storage unit 80 etc.
- the number (311800) stores the number of times the oil cutting operation is performed in the storage unit 80, etc., and updates the number of times during one cycle or within a certain period other than that.
- the number of times of execution may be reset at a predetermined timing such as when one period ends, when the ignition switch of the vehicle is turned off, or when maintenance is executed.
- the MII II 80 obtains the elapsed time from the end of the last oil cutting operation from the storage unit 80 or the like, compares the elapsed time with a preset constant time, and It is judged whether or not a certain time has passed since the oil cutting operation (step 311 0). If it is determined that the fixed time has not elapsed since the last oil cutting operation (step 3 1 1 0: N 0), the process ends.
- step 3 1 1 1 determines that a certain period of time has passed since the last oil cutting operation (step 3 1 1 0: Mimi 3).
- the number of executions of the oil cutting operation is determined in advance. Determine whether it is less than or equal to the number of executable times (step 3 1 1 1)
- step 3 1 1 1 1 :N 0 When it is judged that the number of oil cuts (3 1 1 1 800) exceeds the number of times that oil cuts can be performed (step 3 1 1 1 :N 0), the process is terminated. If it is determined that the number of executions is less than or equal to the number of executions (step 3 1 1 1 :Mr. 3), the temperature detected by the temperature sensor 5 2 is acquired (step 3 1 1 2) 0
- MII II 80 determines whether or not the acquired temperature is at or above the temperature threshold value 1: (step 3 1 1 3).
- the temperature threshold I II used here is set according to the operating rate of the compressor 4. (311 800 determines that the acquired temperature is equal to or higher than the temperature threshold value (step 3 1 1 3 :Mimi 3), switches the air drying circuit 1 1 to the 4th operation mode and switches the oil cut operation. Perform (step 3 1 1 4) When the operating rate of the compressor 4 is low, the temperature threshold value 1 1 * 1 is set high, so the frequency of oil cut operation is low. When the operating rate is high, the temperature threshold value 1: II is set low, so the frequency of oil cut operation is high. ⁇ 0 2020/175468 29 ⁇ (: 170? 2020 /007467
- the temperature threshold value I set for prohibition is used, and therefore the oil cut operation is not executed.
- the MI II 80 determines that the acquired temperature is less than the temperature threshold I II (step 3 1 1 3 :N 0 ), it ends the process.
- No. II II 80 of the air drying circuit 11 acquires operation information indicating the operation status of the compressor 4, and based on the acquired operation information of the compressor 4, purging operation, oil cut operation and Change the execution frequency of the playback operation.
- the supply of compressed dry air to the pneumatic system mounted on the vehicle needs to be prioritized based on the operating state of the compressor, it is possible to reduce the frequency of these operations. it can.
- ( 3 1 1 800 determines that it is necessary to clean the filter 17 under conditions where compressed dry air is supplied to the pneumatic system, those actions will be performed.
- the filter 17 can be cleaned by increasing the execution frequency of.
- the purging operation can be performed in consideration of not only the wet state of compressed dry air after passing through the filter 17 but also the wet state of compressed air before passing through the filter 17. In other words, even if the compressed air with a high humidity is delivered from the compressor 4 and the compressed dry air that has passed through the filter 17 has a significantly low humidity due to the filter 17 capturing a large amount of water, the purging operation is not performed. Easier to do. Therefore, the execution frequency of the purge operation can be optimized.
- the prohibition value is set for the purge operation threshold value and the oil cut operation threshold value corresponding to when the operating rate of the compressor 4 is higher than the predetermined value. Has been done. Therefore, the operation mode does not switch under the condition that the compressed dry air is consumed by the pneumatic system, and the compressed dry air can be stably supplied from the air drying circuit 11 to the air tank 30.
- the cutout pressure is set to a high value when the operating rate of the compressor 4 is high.
- By setting the cutout pressure high in this way it is possible to perform a filter cleaning operation including a purge operation and a regeneration operation after a sufficient amount of compressed dry air is stored in the air tank 30. Therefore, the supply of compressed dry air to the pneumatic system installed in the vehicle can be prioritized.
- Whether or not to execute the oil cutting operation is determined based on whether or not the temperature of the compressed dry air is equal to or higher than the temperature threshold value 1:. Also, if it is determined that the operation rate of the compressor 4 is low, the temperature threshold value 1: II is set high, and if it is determined that the operation rate of the compressor 4 is high, the temperature threshold value 1: II is set low. did. Therefore, when the operating rate of the compressor 4 is low, the frequency of oil cut operation is reduced when the temperature of the compressed dry air becomes low, and when the operating rate of the compressor 4 is high, the compressed dry air The frequency of oil cut operation can be increased when the temperature becomes high.
- the operation time of the Combressa 4 is the mouth time and unload time. ⁇ 0 2020/175468 31 ⁇ (: 170? 2020 /007467
- the operating state of the compressor 4 is determined based on them to perform the purging operation, oil cutting operation and regenerating operation.
- the timing can be accurately determined.
- the condition for starting the purging operation is that the pressure in the air tank 30 is equal to or higher than the cutout pressure, and the moisture content of the compressed dry air supplied to the air tank 30 is the water content.
- the amount is equal to or more than the amount threshold value
- an arbitrary index indicating the wet state in the compressed dry air or the air tank 30 may be used instead of the content moisture content.
- the index may be, for example, the amount of water contained in the compressed dry air per unit volume, the humidity of the humidity sensor 51 detected during the dehumidifying operation, or the amount of water in the air tank 30. Good. Whether the purge operation is necessary or not is judged based on only the compressed dry air or the wet condition in the air tank 30 regardless of whether the pressure in the air tank 30 is equal to or higher than the cutout pressure. May be.
- the condition for starting the regeneration operation is that the water content in the air tank 30 is equal to or greater than the threshold value, assuming that the pressure in the air tank 30 is equal to or higher than the cutout pressure.
- compressed dry air or any index indicating the wet state in the air tank 30 may be used instead of the amount of water in the air tank 30, compressed dry air or any index indicating the wet state in the air tank 30 may be used.
- the index may be, for example, the amount of water contained in the compressed dry air per unit volume, or the humidity of the humidity sensor 51 detected during the dehumidifying operation, and the compressed dry air supplied to the air tank 30.
- the water content of may be.
- the conditions for starting the oil cutting operation are that the elapsed time from the previous oil cutting operation is a certain time or more, the number of executions is less than or equal to the number of executions possible, The temperature of the compressed dry air is below the temperature threshold, but one or two of these may be used.
- the condition for starting the shut-off operation may be that the pressure in the air tank 30 is equal to or higher than the cutout pressure. In this case, the oil cutting operation will not be performed unless a sufficient amount of compressed dry air is stored in the air tank 30, so the consumption of compressed air sent from the compressor 4 can be suppressed. Through, the supply of compressed dry air to the pneumatic system can be prioritized.
- the temperature threshold when the operating rate of the compressor 4 is low (for example, less than 10%), the temperature threshold is set high to reduce the frequency of oil cut operation, and the operating rate of the compressor 4 is high. In this case (for example, 30% or more and less than 50%), the temperature threshold value was set low to increase the frequency of oil cut operation.
- the moisture content threshold value is set to be high to reduce the frequency of purging operation, and when the operating rate of the compressor 4 is high (for example, 30%). % Or more and less than 50%), the frequency of execution of the purge operation is also high when the compressor 4 operation rate is low, even for operations other than the purge operation and the oil cut operation in which the purge frequency is increased.
- the regenerating operation if the predetermined condition such as reducing the consumption of compressed dry air in the air tank 30 is satisfied, the regenerating operation is performed less frequently when the operation rate of the compressor 4 is low, The replay operation may be executed more frequently when the work rate is high.
- the operation execution frequency is low when the operating rate of the compressor is low. May be lower and the operation may be performed more frequently when the operation rate is high.
- a prohibition value is set as the threshold to prohibit the purging operation and the oil cutting operation.
- the threshold value may be set for all the operating rates (0% to 100%) of the comblator 4. Even in this case, the threshold value may be lowered as the operating rate of the compressor 4 increases. Or, for example, ⁇ 0 2020/175468 33 ⁇ (: 170? 2020 /007467
- the threshold value becomes lower as the operating rate of the compressor 4 becomes higher, and the operating rate of the compressor 4 becomes higher as the operating rate of the compressor 4 exceeds the predetermined value. You may raise a threshold value.
- a prohibition value is set as the threshold value to prohibit the purging operation and the oil cutting operation.
- only the purging operation may be prohibited or only the oil cutting operation may be prohibited when the operating rate of the compressor 4 is a predetermined value or more.
- both the purging operation and the regenerating operation, both the oil cutting operation and the regenerating operation, or the purging operation, the cooling operation and the regenerating operation are prohibited. Good.
- the conditions of the regenerating operation, the conditions of the purging operation, and the conditions of the oil cooling operation were set, and each operation was executed according to these conditions. However, one or two of these conditions are set.
- Each operation may be executed according to the following.
- the purging operation may be performed under different conditions.
- the purge operation may be omitted from the operation mode of the air drying circuit 11.
- the oil cut operation may be performed under different conditions.
- the oil cut operation may be omitted from the operation mode of the air drying circuit 11.
- the reproduction operation may be executed under another condition.
- the regeneration operation may be omitted from the operation mode of the air drying circuit 11.
- the filter 17 includes an oil trap, but
- the oil trap may be omitted from 7.
- 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 does not necessarily require the second operation mode and the fourth to sixth operation modes.
- the air supply system 10 includes a truck, a bus, a construction machine, etc. ⁇ 02020/175468 34 ⁇ (: 170? 2020 /007467
- the air supply system 10 may be mounted on another moving body such as a passenger car, a railway vehicle, or the like.
- the ECU 80 is not limited to the software processing for all the processing executed by itself.
- 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.
- AS IC application specific integrated circuit
- 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.
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Abstract
Description
Claims
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202080030112.5A CN113766963B (zh) | 2019-02-25 | 2020-02-25 | 空气供给系统、空气供给系统的控制方法及空气供给系统的控制程序 |
| CN202510014083.8A CN119801883A (zh) | 2019-02-25 | 2020-02-25 | 空气供给系统、空气供给系统的控制方法及空气供给系统的控制程序 |
| JP2021502266A JP7753092B2 (ja) | 2019-02-25 | 2020-02-25 | 空気供給システム、空気供給システムの制御方法、及び空気供給システムの制御プログラム |
| EP20762450.3A EP3932523A4 (en) | 2019-02-25 | 2020-02-25 | AIR SUPPLY SYSTEM, AIR SUPPLY SYSTEM CONTROL METHOD, AND AIR SUPPLY SYSTEM CONTROL PROGRAM |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-031991 | 2019-02-25 | ||
| JP2019031991 | 2019-02-25 |
Publications (1)
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|---|---|
| WO2020175468A1 true WO2020175468A1 (ja) | 2020-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| PCT/JP2020/007467 Ceased WO2020175468A1 (ja) | 2019-02-25 | 2020-02-25 | 空気供給システム、空気供給システムの制御方法、及び空気供給システムの制御プログラム |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3932523A4 (ja) |
| JP (1) | JP7753092B2 (ja) |
| CN (2) | CN119801883A (ja) |
| WO (1) | WO2020175468A1 (ja) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023085436A1 (ja) * | 2021-11-15 | 2023-05-19 | ナブテスコオートモーティブ株式会社 | 空気供給システム、空気供給システムの制御方法、及び空気供給システムの制御プログラム |
Citations (5)
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- 2020-02-25 CN CN202510014083.8A patent/CN119801883A/zh active Pending
- 2020-02-25 CN CN202080030112.5A patent/CN113766963B/zh active Active
- 2020-02-25 EP EP20762450.3A patent/EP3932523A4/en active Pending
- 2020-02-25 WO PCT/JP2020/007467 patent/WO2020175468A1/ja not_active Ceased
- 2020-02-25 JP JP2021502266A patent/JP7753092B2/ja active Active
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Also Published As
| Publication number | Publication date |
|---|---|
| CN113766963B (zh) | 2025-01-14 |
| JP7753092B2 (ja) | 2025-10-14 |
| CN113766963A (zh) | 2021-12-07 |
| EP3932523A1 (en) | 2022-01-05 |
| EP3932523A4 (en) | 2023-04-12 |
| JPWO2020175468A1 (ja) | 2021-12-23 |
| CN119801883A (zh) | 2025-04-11 |
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