CN111608813A - An engine exhaust temperature management method, device and engine - Google Patents

Abstract

The invention discloses an engine exhaust temperature management method, device and engine. The method includes acquiring current working information of the engine, determining a firing frequency of the engine according to the working information, and based on the firing frequency and the working The information determines whether the engine needs to perform exhaust temperature coordinated control on the coordinated control component, and obtains the exhaust temperature coordinated control request flag; determines the coordinated control of the coordinated control component according to the exhaust temperature coordinated control request flag and the work information information; determine a closed-loop control instruction based on the coordinated control information and the working information; drive the corresponding coordinated control component to act based on the closed-loop control instruction, the working information and the coordinated control information. The present application achieves the technical effect of accurately managing the exhaust temperature of the engine to meet the temperature requirements of the aftertreatment system without increasing the fuel consumption of the engine or slightly increasing the fuel consumption of the engine.

Description

An engine exhaust temperature management method, device and engine

technical field

Embodiments of the present invention relate to the technical field of engines, and in particular, to a method, device and engine for managing exhaust gas temperature of an engine.

Background technique

Existing engine exhaust temperature control methods generally use the following methods:

1. A post-injection process using a fuel system, a hydrocarbon injector, and a heating device configured to heat exhaust gas in a particulate filter, wherein the energy provided is based on the expected temperature at a selected location in the exhaust system, exhaust gas The flow rate of the gas, the temperature of the exhaust gas received by the exhaust system, the flow rate of the exhaust gas at the inlet of the oxidation catalyst, and the temperature of the exhaust gas at the inlet of the oxidation catalyst.

2. Receive the detected exhaust gas temperature of the engine, and if the exhaust gas temperature is lower than the first threshold, correct the intake air amount setting value of the throttle valve based on the exhaust gas temperature; the corrected intake air amount The set value is smaller than the set value of the intake air volume before correction, and the lower the exhaust gas temperature, the smaller the set value of the intake air volume after the correction; based on the set value of the intake air volume after the correction and the The difference in the actual intake air amount of the throttle valve controls the opening degree of the throttle valve of the engine.

3. Determine the exhaust gas temperature demand value according to the engine parameters; when the exhaust gas temperature measurement value is lower than the exhaust gas temperature demand value, determine the exhaust gas temperature difference value; according to the engine parameters, exhaust gas temperature demand value, exhaust gas temperature difference value and Calculate the constant to determine the throttle valve position demand value; determine the drive current demand value according to the throttle valve position demand value and the throttle valve position measurement value; control the intake throttle valve control according to the parameters of the control motor and the drive current demand value The motor reduces the opening of the intake throttle valve.

4. The temperature value of the DPF system is collected in real time through the temperature sensor and transmitted to the electronic control unit. According to the temperature value, the electronic control unit calculates the required temperature to adjust the current temperature of the DPF filter to the target temperature through the open-loop control algorithm and the closed-loop PID control algorithm. The fuel injection quantity is converted into a corresponding pulse width signal to drive the fuel control valve to achieve precise control of the fuel injection quantity before the DOC catalyst, so as to control the engine exhaust temperature and then the DPF filter temperature.

There are mainly the following shortcomings in the prior art:

1. Use a single throttle valve for exhaust temperature control, which can control a narrow temperature range, which often fails to meet the after-treatment system's demand for exhaust temperature increase; in addition, the throttling of the throttle valve reduces the intake air It will increase the pumping loss of the engine and reduce the fuel economy of the engine;

2. Using the post-injection process alone to increase the exhaust temperature at the inlet of the oxidation catalyst will cause the fuel economy of the engine to drop significantly;

3. Existing cylinder skipping technology or variable displacement technology fails to quantitatively control exhaust temperature; it fails to coordinate with other engine components to complete exhaust temperature management.

SUMMARY OF THE INVENTION

The invention provides an engine exhaust temperature management method, which achieves the technical effect of accurately managing the engine exhaust temperature to meet the temperature requirement of the aftertreatment system without increasing the engine fuel consumption or slightly increasing the engine fuel consumption.

An embodiment of the present invention provides an engine exhaust temperature management method, the method comprising:

Obtain the working information of the current engine, determine the ignition frequency of the engine according to the working information, and determine whether the engine needs to perform coordinated control of the exhaust temperature on the coordinated control component based on the ignition frequency and the working information, and obtain the exhaust temperature. Coordinated control request flags, wherein the engine operation information includes required torque, engine speed, target exhaust temperature, actual exhaust temperature, and exhaust temperature management request flags;

The coordinated control information of the coordinated control component is determined according to the exhaust temperature coordinated control request flag and the working information, wherein the coordinated control information of the coordinated control component includes: the coordination component activation status word, the activation component control mode status word and closed loop control sequence status word;

determining a closed-loop control instruction based on the coordinated control information and the work information;

Based on the closed-loop control instruction, the work information and the coordinated control information, the corresponding coordinated control components are driven to act.

Further, the determining the firing frequency of the engine based on the working information includes:

If the exhaust temperature management request flag bit is 0, query a first look-up table based on the required torque and the engine speed to determine the firing frequency;

If the exhaust temperature management request flag is 1, query a second look-up table based on the required torque, the engine speed and the target exhaust gas temperature to determine the open-loop control value of the firing frequency, and based on the open-loop control value of the ignition frequency A loop control value, the target exhaust temperature, and the actual exhaust temperature determine a closed-loop control value for the firing frequency, and the firing frequency is determined based on the closed-loop control value.

Further, determining the closed-loop control value of the firing frequency based on the open-loop control value, the target exhaust gas temperature, and the actual exhaust gas temperature, and determining the firing frequency based on the closed-loop control value includes:

The target exhaust temperature and the actual exhaust temperature are subjected to closed-loop control, and then the open-loop control value is added to obtain the closed-loop control value of the firing frequency;

The closed-loop control value of the firing frequency is adjusted by the firing frequency limiting module to obtain the firing frequency.

Further, the determining a closed-loop control instruction based on the coordination control information and the work information includes:

Determine the upper limit value of the controller output based on the coordination component activation status word and the activation component control mode status word;

The closed-loop control command is determined based on the target exhaust gas temperature, the actual exhaust gas temperature, and an upper limit value output by the controller.

Further, determining the upper limit value of the controller output based on the coordination component activation status word and the activation component control mode status word includes:

Carry out bitwise AND operation on the coordination component activation status word and the activation component control mode status word, and convert the calculation result into a binary value;

The number of "1"s contained in the secondary system value is counted, and the number of "1"s is the upper limit of the output of the controller.

Further, the actuation of the corresponding coordinated control component based on the closed-loop control instruction, the work information and the coordinated control information includes:

Determine the coordinated control component that adopts the closed-loop control mode and the coordinated control component that adopts the open-loop control mode according to the activation state word of the coordination component and the state word of the control mode of the activation component;

Determine the execution sequence of the coordinated control components using the closed-loop control mode according to the closed-loop control sequence status word;

According to the closed-loop control instruction, the coordinated control components adopting the closed-loop control mode are sequentially driven and controlled;

According to the working information, a third look-up table is inquired to determine the drive instruction of the coordinated control component that adopts the open-loop control mode, and the drive control of the coordinated control component that adopts the open-loop control mode is performed.

Embodiments of the present invention also provide an engine exhaust temperature management device, the device comprising:

The firing frequency management module is used to obtain the working information of the current engine, determine the firing frequency of the engine according to the working information, and determine whether the engine needs to discharge the coordinated control components based on the firing frequency and the working information. temperature coordination control, obtaining the exhaust temperature coordination control request flag, wherein the engine working information includes the required torque, engine speed, target exhaust temperature, actual exhaust temperature and exhaust temperature coordinated control request flag;

A coordination component control configuration module, configured to determine the coordination control information of the coordination control component according to the exhaust temperature coordination control request flag and the work information, wherein the coordination control information of the coordination control component includes: the coordination component Active status word, active component control mode status word and closed-loop control sequence status word;

a closed-loop control module of the coordination component, configured to determine a closed-loop control instruction based on the coordination control information and the work information;

The coordination component execution module is configured to drive the corresponding coordinated control component to act based on the closed-loop control instruction, the work information and the coordinated control information.

Further, the firing frequency management module includes:

a first determination submodule, configured to query a first look-up table based on the required torque and the engine speed to determine the firing frequency if the exhaust temperature management request flag is 0;

The second determination sub-module is configured to query a second look-up table based on the required torque, the engine speed and the target exhaust gas temperature to determine the on-off of the ignition frequency if the exhaust temperature management request flag is 1 A loop control value, a closed-loop control value of the firing frequency is determined based on the open-loop control value, the target exhaust gas temperature, and the actual exhaust gas temperature, and the firing frequency is determined based on the closed-loop control value.

Further, the closed-loop control module of the coordination component includes:

a third determination submodule, configured to determine the upper limit value of the controller output based on the coordination component activation status word and the activation component control mode status word;

The fourth determination sub-module is configured to determine the closed-loop control command based on the target exhaust gas temperature, the actual exhaust gas temperature, and an upper limit value output by the controller.

An embodiment of the present invention further provides an engine, the engine uses the engine exhaust temperature management method described in any one of the above claims.

The invention discloses a method, device and engine for managing exhaust gas temperature of an engine. The method includes acquiring working information of a current engine, determining a firing frequency of the engine according to the working information, and based on the firing frequency and the working The information determines whether the engine needs to perform exhaust temperature coordinated control on the coordinated control component, and obtains the exhaust temperature coordinated control request flag; determines the coordinated control of the coordinated control component according to the exhaust temperature coordinated control request flag and the work information information; determine a closed-loop control instruction based on the coordinated control information and the working information; drive the corresponding coordinated control component to act based on the closed-loop control instruction, the working information, and the coordinated control information. The present application achieves the technical effect of accurately managing the exhaust temperature of the engine to meet the temperature requirements of the aftertreatment system without increasing the fuel consumption of the engine or slightly increasing the fuel consumption of the engine.

Description of drawings

1 is a structural diagram of a six-cylinder diesel engine provided by an embodiment of the present invention;

FIG. 2 is a flowchart of a method for managing exhaust gas temperature of an engine provided by an embodiment of the present invention;

3 is a functional block diagram of an engine exhaust temperature management method provided by an embodiment of the present invention;

Fig. 4 is the calculation logic block diagram of determining firing frequency provided by the embodiment of the present invention;

Fig. 5 (a) is a kind of flow chart of looking up the table to determine the control instruction provided by the embodiment of the present invention;

Fig. 5 (b) is another kind of look-up table to determine the flow chart of the control instruction provided by the embodiment of the present invention;

FIG. 5( c ) is a flow chart of determining a control instruction through a neural network according to an embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all structures related to the present invention.

It should be noted that the terms "first", "second" and the like in the description, claims and drawings of the present invention are used to distinguish different objects, rather than to limit a specific order. The following embodiments of the present invention may be implemented independently, or may be implemented in combination with each other, which are not specifically limited in the embodiments of the present invention.

The present invention is applicable to various types of engines, including diesel engines, gasoline engines, natural gas engines, etc. FIG. 1 is a structural diagram of a six-cylinder diesel engine provided by an embodiment of the present invention. Illustratively, referring to FIG. 1 , in normal firing operation, the fresh air passes through the variable area turbocharger 010 and then is cooled by the supercharger intercooler 020 and then mixed in the intake manifold with the exhaust gas passing through the exhaust gas recirculation valve 080 The rear mixture enters the engine cylinder through the intake valve 030 during the intake stroke; the low-pressure fuel in the fuel tank is pressurized by the high-pressure fuel pump control valve 090 and sent to the common rail pipe 091, and the rail pressure sensor 092 can measure the common rail in real time. The fuel pressure in the rail pipe 091; the fuel injector 040 receives the high-pressure fuel from the common rail pipe 091 through the high-pressure fuel pipe, and when the piston of the engine compression stroke moves to the position near the top dead center, the high-pressure fuel is injected into the engine cylinder and inside. The high-pressure air-fuel mixture is mixed, and the energy is released by compression ignition during the engine power stroke, which in turn pushes the piston downward to perform work to generate output torque. During the exhaust stroke of the engine, the gas in the cylinder enters the exhaust pipe through the exhaust valve 050, and the temperature of the exhaust gas can be measured by the exhaust temperature sensor 060. A part of the exhaust gas will push the turbine of the variable-section turbocharger 010 to achieve the intake boost function, and then enter the aftertreatment equipment, and finally be discharged into the atmosphere; the remaining part of the exhaust gas will pass through the exhaust gas recirculation intercooler 070 After cooling, it is intermixed with fresh air in the intake manifold through exhaust gas recirculation valve 080 . During the flashover operation, the intake valve 030 will be closed during the intake stroke to prevent the mixture in the intake manifold from entering the cylinder; during the compression stroke, the piston moves to the vicinity of the top dead center and the fuel injector 040 prohibits injection; During the exhaust stroke, the exhaust valve 050 remains closed.

In order to meet the current emission standards, engine manufacturers generally arrange a large number of after-treatment equipment in the engine exhaust pipeline, such as DPF (diesel particulate filter), SCR (selective catalytic reduction technology) and so on. In order to better remove the pollutants in the exhaust gas, so that the post-processing equipment is in a state of higher conversion efficiency, it is necessary to have certain requirements on the temperature of the exhaust gas. When the engine has just started or is running under low-load conditions for a long time, the exhaust temperature of the engine will be very low, and it is difficult for the aftertreatment equipment to play its due role in reducing pollutants in the exhaust gas, so an exhaust temperature management request will be issued. , and propose a target exhaust temperature.

FIG. 2 is a flowchart of a method for managing exhaust gas temperature of an engine provided by an embodiment of the present invention. FIG. 3 is a functional block diagram of an engine exhaust temperature management method provided by an embodiment of the present invention.

As shown in Figure 2 and Figure 3, the engine exhaust temperature management method specifically includes the following steps:

Step S101, obtain the working information of the current engine, determine the ignition frequency of the engine according to the working information, and determine whether the engine needs to perform coordinated exhaust temperature control on the coordinated control component based on the ignition frequency and the working information, and obtain the exhaust temperature coordinated control request flag 220, The engine operation information includes the required torque 110 , the engine speed 120 , the target exhaust temperature 130 , the actual exhaust temperature 140 , and the exhaust temperature management request flag 150 .

Specifically, referring to FIG. 3 , the firing frequency management module 001 can obtain the working information of the current engine, and the working information specifically includes the following signals: demanded torque 110 , engine speed 120 , target exhaust temperature 130 , actual exhaust temperature 140 , and exhaust temperature The management request flag bit 150, for example, the values of the above-mentioned signals may be 120Nm, 1000rpm, 250°C, 150°C, and 1, respectively. The ignition frequency management module 001 first determines the ignition frequency of the engine according to the obtained working information. When the engine flashes based on the ignition frequency, the exhaust temperature can be increased. After determining the ignition frequency, it is necessary to judge whether the ignition frequency can be obtained. Based on this frequency, the flashover can reach the required exhaust temperature. If it can be reached, the value of the exhaust temperature management request flag 150 is 0, that is, other coordinated control components are not required to perform coordinated exhaust temperature control. At this time, it is not necessary to increase The fuel consumption of the engine means that the exhaust temperature of the engine meets the temperature requirements of the post-processing system; if the required exhaust gas temperature cannot be reached based on the frequency of the flashover, the value of the exhaust temperature management request flag bit 150 is 1, that is, other coordination is required. The control components perform coordinated control of exhaust temperature to increase the exhaust gas temperature. At this time, a small amount of engine fuel consumption needs to be increased to make other coordinated control components act to meet the temperature requirements of the aftertreatment system.

FIG. 4 is a calculation logic block diagram for determining a firing frequency provided by an embodiment of the present invention.

Optionally, in step S101, determining the firing frequency 210 of the engine based on the working information specifically includes:

Step S1011, if the exhaust temperature management request flag 150 is 0, query the first look-up table 602 based on the required torque 110 and the engine speed 120 to determine the firing frequency 210;

Step S1012, if the exhaust temperature management request flag 150 is 1, query the second look-up table 603 based on the required torque 110, the engine speed 120 and the target exhaust temperature 130 to determine the open-loop control value of the ignition frequency, based on the open-loop control value, The target exhaust temperature 130 and the actual exhaust temperature 140 determine a closed-loop control value for the firing frequency 210, and the firing frequency 210 is determined based on the closed-loop control value.

Specifically, referring to FIG. 4 , when there is no exhaust temperature management request, that is, when the exhaust temperature management request flag 150 is 0, the open-loop control of the firing frequency 210 can be obtained by querying the first look-up table 602 according to the required torque 110 and the engine speed 120 The value is used as the ignition frequency of the current engine, and the output of the exhaust temperature coordination control request flag 220 is 0; when there is an exhaust temperature management request, that is, when the exhaust temperature management request flag 150 is 1, the query will be performed according to the required torque 110 and engine speed 120. The second look-up table 603 and other methods are used to obtain the open-loop control value of the ignition frequency 210 as the output plus the difference between the target exhaust temperature 130 and the actual exhaust temperature 140 to perform closed-loop control as the original control value of the ignition frequency 210 .

When the original control value of the ignition frequency 210 falls into the area where the current working condition is prohibited from working, select the corresponding allowable ignition frequency as the ignition frequency control value; otherwise, the original control value of the ignition frequency 210 is used as the ignition frequency control value; when When the ignition frequency control value is less than the lower limit value of the ignition frequency 210 under the current working condition, the module outputs the lower limit value as the ignition frequency 210 of the current engine, and the exhaust temperature coordination control request flag 220 outputs 1; otherwise, the module outputs the ignition frequency control The minimum value of the value and the upper limit value of the firing frequency 210 under the current operating condition is used as the firing frequency of the current engine, and the output of the exhaust temperature coordinated control request flag 220 is 0.

Optionally, step S1052, determining the closed-loop control value of the firing frequency 210 based on the open-loop control value, the target exhaust temperature 130 and the actual exhaust temperature 140, and determining the firing frequency 210 based on the closed-loop control value includes: the target exhaust temperature 130 and the actual exhaust temperature 140. The closed-loop control value of the firing frequency 210 is obtained by adding the open-loop control value to the actual exhaust temperature 140 after the closed-loop control; the closed-loop control value of the firing frequency 210 is adjusted by the firing frequency limiting module 702 to obtain the firing frequency 210 .

Specifically, referring to FIG. 3 and FIG. 4 , when there is no exhaust temperature management request, that is, the value of the exhaust temperature management request flag 150 is 0, the ignition frequency 210 of the current engine directly passes the current operating condition, that is, according to the required torque 110 and the engine The rotational speed 120 is obtained by querying the first look-up table 602 .

When the value of the exhaust temperature management request flag 150 is 1, the open-loop control value of the firing frequency is obtained by querying the second look-up table 603 according to the current operating conditions, that is, according to the required torque 110, the engine speed 120 and the target exhaust temperature 130. Then use the obtained open-loop control value plus the target exhaust temperature 130 and the actual exhaust temperature 140 to feedback the closed-loop control value of the firing frequency obtained by PID control (that is, through the PID control module 701 ), and then pass through the firing frequency limit module 702 After the adjustment of , the final result of the firing frequency 210 of the current engine is obtained. The firing frequency limiting module 702 mainly implements two functions, one is to exclude the forbidden range of the firing frequency 210 ; the other is to limit the upper and lower limits of the firing frequency 210 .

Exemplarily, the upper and lower limits of the firing frequency 210 can be obtained simply by looking up a table according to the current operating conditions. For example, under a certain working condition, the achievable firing frequency is shown in Table 1. The firing frequency 210 in the shaded background part is the working range prohibited by the current working condition. It is assumed that the upper and lower limits of the firing frequency 210 are 1/6 respectively. , 1. The firing frequency 210 calculated by the open-loop and closed-loop control is 0.4. At this time, the corresponding achievable firing frequency 210 is 5/12, but this firing frequency 210 falls into the forbidden working range, so 1/2 can be used as The firing frequency of the current engine is 210. The ignition frequency 210 of the current engine is greater than 1/6 of the lower limit value of the ignition frequency, therefore, the exhaust temperature coordinated control request flag 220 takes a value of 0.

Table 1. Value list of firing frequency limit module

Step S102: Determine the coordination control information of the coordinated control component according to the exhaust temperature coordination control request flag 220 and the work information, wherein the coordinated control information of the coordinated control component includes: the coordination component activation status word 310, the activation component control mode status word 320 and The closed loop control sequence status word 330.

Specifically, referring to FIG. 2 and FIG. 3 , the coordination component control configuration module 002 can receive the signal of the exhaust temperature coordination control request flag 220 output by the firing frequency management module 001 and the signal of the working information, and the coordination component control configuration module 002 according to The required torque 110, the engine speed 120, the target exhaust temperature 130 and the actual exhaust temperature 140 in the working information, and the exhaust temperature coordinated control request flag 220 determine the coordinated control information of the coordinated control component, that is, determine the coordinated control component that needs to be activated and its corresponding control mode, and sort the execution sequence of the activated coordinated control components adopting the closed-loop control mode. Exemplarily, when there is no exhaust temperature coordination control request, that is, when the exhaust temperature coordination control request flag 220 is 0, the coordinated component activation status word 310, the activation component control mode status word 320, and the closed-loop control sequence status word 330 are all output as 0. .

When there is an exhaust temperature coordinated control request, that is, when the exhaust temperature coordinated control request flag 220 is 1, assuming that there are four types of coordinated component actuators, the coordinated component activation status word 310 can be obtained by looking up the table according to the operating conditions and the target exhaust gas temperature 130 , specifically, the value of the coordination component activation status word 310 may be an 8-bit unsigned integer, and the nth (n>0) bit of the binary represents the coordination component executor n (for example, 4 in this embodiment) Coordinate component actuator, then n=4) active state. For example, if the value of the coordination part activation status word 310 is 10, its binary number is 00001010, which means that the coordinating actuator part 2 and the coordinating actuator part 4 are activated and participate in the coordinated control of exhaust temperature; The value is 5, and its binary number is 00000101, which means that the coordinating actuator part 1 and the coordinating actuator part 3 are activated and participate in the coordinated control of the exhaust temperature.

The status word 320 of the active component control mode can be obtained by looking up the table according to the operating conditions and the target exhaust gas temperature 130, and its value can be an 8-bit unsigned integer number, and the nth bit of the binary represents whether the coordination component executor n is performing or not. Closed-loop control. For example, the value of the status word 320 of the active component control mode is 1, which means that the coordinated actuator component 1 adopts closed-loop control, and the other coordinated execution components adopt open-loop control.

The closed-loop control sequence status word 330 can be obtained by looking up the table according to the operating conditions and the target exhaust gas temperature 130 , and its value can be an 8-bit unsigned integer number, and the meaning represented by the value is shown in Table 2.

Table 2. Closed-loop control sequence status word calculation logic table

Closed loop control sequence status word 330 execution order 1 execution order 2 execution order 3 execution order 4 0 NA. NA. NA. NA. 1 Coordinate Actuator Part 1 Coordinate Actuator Part 2 Coordinate Actuator Part 3 Coordinate Actuator Part 4 2 Coordinate Actuator Part 1 Coordinate Actuator Part 2 Coordinate Actuator Part 4 Coordinate Actuator Part 3 3 Coordinate Actuator Part 1 Coordinate Actuator Part 3 Coordinate Actuator Part 2 Coordinate Actuator Part 4 twenty four Coordinate Actuator Part 4 Coordinate Actuator Part 3 Coordinate Actuator Part 2 Coordinate Actuator Part 1

If the value of the coordination part activation status word 310, the activation part control mode status word 320, and the closed-loop control sequence status word 330 are respectively 15, 13, and 3, it means that the four types of coordinating part executors are all in the active state, and the coordinating part executor 2 Open-loop control is adopted, and closed-loop control is adopted for the other coordinating component actuators, and the closed-loop control sequence is coordinating actuator component 1, coordinating actuator component 3, and coordinating actuator component 4.

Step S103, determining a closed-loop control instruction based on the coordination control information and the work information.

2 and 3 , the coordination component closed-loop control module 003 can receive the coordination control information output by the coordination component control configuration module 002 and the working information output by the firing frequency management module 001. Specifically, the coordination component closed-loop control module 003 can The closed-loop control command 410 is determined by coordinating the component activation status word 310 and the activation component control mode status word 320 in the control information, and the target exhaust temperature 130 and actual exhaust temperature 140 in the operating information.

Optionally, in step S103, determining the closed-loop control instruction based on the coordination control information and the work information includes the following steps:

Step S1031, determining the upper limit value of the controller output based on the coordination component activation status word 310 and the activation component control mode status word 320;

In step S1032, the closed-loop control command 410 is determined based on the target exhaust gas temperature 130, the actual exhaust gas temperature 140 and the upper limit value output by the controller.

Optionally, step S1031, determining the upper limit value of the controller output based on the coordination component activation status word and the activation component control mode status word includes: performing a bitwise AND operation on the coordination component activation status word 310 and the activation component control mode status word 320. , and convert the calculation result into a binary value; count the number of "1" contained in the binary value, and the number of "1" is the upper limit value of the controller output.

Specifically, first perform a bitwise AND operation on the coordination component activation status word 310 and the activation component control mode status word 320, and convert the calculation result into a binary value, and then count the number of values that the binary value contains "1", The value of "1" is the upper limit value of the controller output.

After the upper limit of the controller output is obtained, the target exhaust temperature 130 and the actual exhaust temperature 140 are used as the input and feedback of a closed-loop controller, respectively, and the result of the closed-loop controller is limited by a limit module. After the value is obtained, a closed-loop control instruction 410 with a final output value range between 0 and an upper limit value is obtained. The lower limit value of the limit value module is 0, and the upper limit value is the upper limit value of the controller output. The above-mentioned closed-loop controller may be a PID (proportional-integral-derivative) controller, an improved PID controller, a fuzzy controller, an ADRC (active disturbance rejection controller) controller, etc., which are not limited here.

Step S104 , based on the closed-loop control instruction 410 , the work information and the coordinated control information, the corresponding coordinated control components are driven to act.

2 and 3, the coordination component execution module 004 can receive the closed-loop control instruction 410 output by the coordination component closed-loop control module 003, the coordination control information output by the coordination component control configuration module 002, and the work information output by the firing frequency management module 001, And based on the received information, the corresponding coordinated control components are driven to act. For example, the closed-loop control components 1 to n represent the first to n-th driven components that are driven in sequence; the driving command of the closed-loop control component n is equal to the closed-loop control of the coordination component. The closed-loop control command 410 issued by the control module 003 is the result of subtracting (n-1) and taking the maximum value from zero; the actual driving command of the closed-loop control component n is equal to the control value obtained by the above-mentioned driving command through table look-up. Then, according to the engine operation information, the actual driving commands of the coordination components activated and controlled by open-loop control are determined by looking up a table or the like.

Specifically, the coordination component execution module 004 is based on the required torque 110 , the engine speed 120 , the target exhaust temperature 130 , and the actual exhaust temperature 140 in the working information, and the coordination component activation status word 310 and the activation component control mode status in the coordination control information. The word 320, the closed-loop control sequence status word 330 and the closed-loop control instruction 410 drive the actions of the corresponding coordinated control components.

Optionally, in step S104, driving the action of the corresponding coordinated control component based on the closed-loop control instruction 410, the work information, and the coordinated control information includes: determining the coordination using the closed-loop control mode according to the coordination component activation status word 310 and the activation component control mode status word 320. The control component and the coordinated control component adopting the open-loop control mode; determine the execution sequence of the coordinated control component adopting the closed-loop control mode according to the closed-loop control sequence status word 330; according to the closed-loop control instruction 410, sequentially drive the coordinated control component adopting the closed-loop control mode Control; query the third look-up table according to the work information to determine the drive command of the coordinated control component adopting the open-loop control mode, and perform drive control for the coordinated control component adopting the open-loop control mode.

Specifically, firstly, according to the coordination component activation status word 310 and the activation component control mode status word 320, determine the coordinated control component that adopts the closed-loop control method and the coordinated control component that adopts the open-loop control method, and then determine the closed-loop control component according to the closed-loop control sequence status word 330. The execution sequence of the coordinated control components in the control mode is then controlled in turn according to the closed-loop control instruction 410, and the coordinated control components in the closed-loop control mode are controlled in turn. Drive commands for control components. It should be noted that the following look-up table 604 , look-up table 605 , and look-up table 606 are all the above-mentioned third look-up tables.

Illustratively, referring to FIGS. 1 and 3 , it is assumed that there are four coordinated control components 1 to 4 representing the variable area turbocharger 010 , the fuel injector 040 , the exhaust gas recirculation valve 080 and the high pressure fuel pump control valve 090 , respectively. The corresponding actual drive commands are boost pressure 510 , post injection amount 520 , valve opening 530 and target rail pressure 540 .

If the coordination component activation status word 310, the activation component control mode status word 320, the closed-loop control sequence status word 330, and the closed-loop control command 410 are 14, 6, 3, and 1.3, respectively, the activated coordinated control components are the injector 040, the exhaust gas The recirculation valve 080 and the high pressure oil pump control valve 090, the coordinated control components adopting the closed-loop control method are the fuel injector 040 and the exhaust gas recirculation valve 080. The closed-loop control components 1 to 2 are the exhaust gas recirculation valve 080 and the fuel injector 040 respectively. The control command 531 of the exhaust gas recirculation valve 080 is 1, and the control command 521 of the fuel injector 040 is 0.3.

FIG. 5( a ) is a flowchart of a table lookup to determine a control instruction provided by an embodiment of the present invention.

FIG. 5(b) is a flow chart of another method of looking up a table to determine a control instruction provided by an embodiment of the present invention.

As shown in Fig. 5(a), according to the control command 531 of the exhaust gas recirculation valve 080, look up the table 604 to get the EGR valve opening 530 to be 100%. 605 After multiplying the maximum post-injection quantity under the current working condition by the coefficient obtained by looking up the table 606 according to the control command 521 of the injector 040, the post-injection quantity 520 is obtained as 56 mg/stk.

FIG. 5( c ) is a flow chart of determining a control instruction through a neural network according to an embodiment of the present invention.

The components that use open-loop control include the high-pressure oil pump control valve 090, and the target rail pressure 540 can be obtained by looking up a table according to the operating condition information, the target exhaust temperature 130, and the like. Optionally, as shown in FIG. 5( c ), a target rail pressure 540 can also be obtained through the artificial neural network 703 according to the required torque 110 , the engine speed 120 , the target exhaust temperature 130 , and the actual exhaust temperature 140 .

The embodiment of the present invention provides an engine exhaust temperature management method. Compared with the traditional exhaust temperature management method, it mainly controls the ignition frequency of the engine and coordinates other engine components (intake pressure control components, exhaust gas recirculation control components) , fuel injection components, fuel pressure control components, etc.), quantify engine exhaust temperature under the constraints of engine power, emission performance, and NVH (Noise, Vibration, Harshness, vibration and harshness) performance control. Compared with the traditional exhaust temperature management method, it mainly has the following advantages: first, in the operation of increasing the engine exhaust temperature, it can effectively reduce the fuel consumption of the engine and reduce the emission of HC and CO2; Under the premise of not increasing engine fuel consumption or a small amount of engine fuel consumption, it can quickly meet the exhaust temperature requirements of the aftertreatment system in many working conditions; thirdly, it can coordinate a variety of engine components to meet relevant constraints. , to manage the engine exhaust temperature more efficiently; fourth, the intake throttle valve, exhaust throttle valve, exhaust gas recirculation valve and other components installed on some engines can be eliminated to reduce the cost of the engine assembly; fifth, applicable For most engines, including diesel engines, gasoline engines, natural gas engines, etc.

Embodiments of the present invention also provide an engine exhaust temperature management device. Referring to Figure 3, the device includes:

The ignition frequency management module 001 is used to obtain the working information of the current engine, determine the ignition frequency of the engine according to the working information, and determine whether the engine needs to perform exhaust temperature coordinated control on the coordinated control components based on the ignition frequency and the working information, and obtain exhaust temperature coordinated control The request flag 220 , wherein the engine operation information includes the required torque 110 , the engine speed 120 , the target exhaust temperature 130 , the actual exhaust temperature 140 , and the exhaust temperature coordinated control request flag 150 .

The coordination component control configuration module 002 is configured to determine the coordination control information of the coordination control component according to the exhaust temperature coordination control request flag 220 and the work information, wherein the coordination control information of the coordination control component includes: the coordination component activation status word 310, the activation Component control mode status word 320 and closed loop control sequence status word 330.

The closed-loop control module 003 of the coordination component is configured to determine the closed-loop control instruction 410 based on the coordination control information and the work information.

The coordination component execution module 004 is configured to drive the action of the corresponding coordinated control component based on the closed-loop control instruction 410, the work information and the coordinated control information.

Optionally, the firing frequency management module 001 includes:

a first determination sub-module, configured to query the first look-up table 602 based on the required torque 110 and the engine speed 120 to determine the firing frequency 210 if the exhaust temperature management request flag is 0;

The second determination sub-module is configured to query the second look-up table 603 based on the required torque 110, the engine speed 120 and the target exhaust temperature 130 to determine the open-loop control value of the firing frequency if the exhaust temperature management request flag is 1, and based on the open-loop control value of the ignition frequency The loop control value, the target exhaust temperature 130, and the actual exhaust temperature 140 determine a closed loop control value for the firing frequency 210, and the firing frequency 210 is determined based on the closed loop control value.

Specifically, as shown in FIG. 3 , determining the closed-loop control value of the firing frequency 210 based on the open-loop control value, the target exhaust gas temperature 130 and the actual exhaust gas temperature 140 , and determining the firing frequency 210 based on the closed-loop control value includes: the target exhaust gas temperature 130 and the actual exhaust temperature 140 are closed-loop controlled and then added with the open-loop control value to obtain the closed-loop control value of the firing frequency 210; the closed-loop control value of the firing frequency 210 is adjusted by the firing frequency limiting module 702 to obtain the firing frequency 210.

Optionally, the coordination component closed-loop control module 003 includes:

a third determination submodule, configured to determine the upper limit value of the controller output based on the coordination component activation status word 310 and the activation component control mode status word 310;

The fourth determination sub-module is configured to determine the closed-loop control instruction 410 based on the target exhaust temperature 130 , the actual exhaust temperature 140 and the upper limit value output by the controller.

Specifically, determining the upper limit value of the controller output based on the coordination component activation status word 310 and the activation component control mode status word 320 includes: performing a bitwise AND operation on the coordination component activation status word 310 and the activation component control mode status word 320, and Convert the calculation result to binary value; count the number of "1" contained in the binary value, and the number of "1" is the upper limit value of the controller output.

Optionally, the coordination component execution module 004 is specifically configured to: determine, according to the coordination component activation status word 310 and the activation component control mode status word 320, the coordinated control component that adopts the closed-loop control mode and the coordinated control component that adopts the open-loop control mode; The control sequence status word 330 determines the execution sequence of the coordinated control components using the closed-loop control mode; according to the closed-loop control instruction 410, the coordinated control components using the closed-loop control mode are sequentially driven and controlled; the third look-up table is inquired according to the work information to determine the open-loop control. The drive command of the coordinated control component in the mode of the open-loop control is used to drive the coordinated control component in the open-loop control mode.

The implementation principle and technical effects of the device provided by the embodiment of the present invention are the same as those of the foregoing method embodiment. For brief description, for the parts not mentioned in the device embodiment, reference may be made to the corresponding content in the foregoing method embodiment.

The engine exhaust temperature management method provided by the embodiment of the present invention has the same technical features as the engine exhaust temperature management device provided by the above embodiment, so it can also solve the same technical problem and achieve the same technical effect.

An embodiment of the present invention further provides an engine, and the engine uses the engine exhaust temperature management method described in any of the foregoing embodiments.

The engine provided by the embodiment of the present invention applies the engine exhaust temperature management method provided by the above embodiment, so the engine provided by the embodiment of the present invention also has the beneficial effects described in the above embodiment, which will not be repeated here.

In the description of the embodiments of the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection, or It can be connected in one piece; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Finally, it should be noted that the above are only the preferred embodiments of the present invention and the applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention. The scope is determined by the scope of the appended claims.

Claims (10)

1. A method for managing exhaust gas temperature of an engine, wherein the method comprises: Obtain the working information of the current engine, determine the ignition frequency of the engine according to the working information, and determine whether the engine needs to perform coordinated control of the exhaust temperature on the coordinated control component based on the ignition frequency and the working information, and obtain the exhaust temperature. Coordinated control request flags, wherein the engine operation information includes required torque, engine speed, target exhaust temperature, actual exhaust temperature, and exhaust temperature management request flags; The coordinated control information of the coordinated control component is determined according to the exhaust temperature coordinated control request flag and the working information, wherein the coordinated control information of the coordinated control component includes: the coordination component activation status word, the activation component control mode status word and closed loop control sequence status word; determining a closed-loop control instruction based on the coordinated control information and the work information; Based on the closed-loop control instruction, the work information and the coordinated control information, the corresponding coordinated control components are driven to act. 2. The method according to claim 1, wherein the determining the firing frequency of the engine according to the working information comprises: If the exhaust temperature management request flag bit is 0, query a first look-up table based on the required torque and the engine speed to determine the firing frequency; If the exhaust temperature management request flag is 1, query a second look-up table based on the required torque, the engine speed and the target exhaust gas temperature to determine the open-loop control value of the firing frequency, and based on the open-loop control value of the ignition frequency A loop control value, the target exhaust temperature, and the actual exhaust temperature determine a closed-loop control value for the firing frequency, and the firing frequency is determined based on the closed-loop control value. 3 . The method of claim 2 , wherein the closed-loop control value of the firing frequency is determined based on the open-loop control value, the target exhaust gas temperature, and the actual exhaust gas temperature, and is based on 3 . The closed-loop control value determining the firing frequency includes: The target exhaust temperature and the actual exhaust temperature are subjected to closed-loop control, and then the open-loop control value is added to obtain the closed-loop control value of the firing frequency; The closed-loop control value of the firing frequency is adjusted by the firing frequency limiting module to obtain the firing frequency. 4. The method according to claim 1, wherein the determining a closed-loop control instruction based on the coordinated control information and the work information comprises: Determine the upper limit value of the controller output based on the coordination component activation status word and the activation component control mode status word; The closed-loop control command is determined based on the target exhaust gas temperature, the actual exhaust gas temperature, and an upper limit value output by the controller. 5. The method according to claim 4, wherein the determining the upper limit value of the controller output based on the coordination component activation status word and the activation component control mode status word comprises: Carry out bitwise AND operation on the coordination component activation status word and the activation component control mode status word, and convert the calculation result into a binary value; The number of "1"s contained in the secondary system value is counted, and the number of "1"s is the upper limit of the output of the controller. 6 . The method according to claim 1 , wherein the driving the corresponding coordinated control component actions based on the closed-loop control instruction, the work information and the coordinated control information comprises: 6 . Determine the coordinated control component that adopts the closed-loop control mode and the coordinated control component that adopts the open-loop control mode according to the activation state word of the coordination component and the state word of the control mode of the activation component; Determine the execution sequence of the coordinated control components using the closed-loop control mode according to the closed-loop control sequence status word; According to the closed-loop control instruction, the coordinated control components adopting the closed-loop control mode are sequentially driven and controlled; According to the working information, a third look-up table is inquired to determine the drive instruction of the coordinated control component that adopts the open-loop control mode, and the drive control of the coordinated control component that adopts the open-loop control mode is performed. 7. An engine exhaust temperature management device, characterized in that the device comprises: The firing frequency management module is used to obtain the working information of the current engine, determine the firing frequency of the engine according to the working information, and determine whether the engine needs to discharge the coordinated control components based on the firing frequency and the working information. temperature coordination control, obtaining the exhaust temperature coordination control request flag, wherein the engine working information includes the required torque, engine speed, target exhaust temperature, actual exhaust temperature and exhaust temperature coordinated control request flag; A coordination component control configuration module, configured to determine the coordination control information of the coordination control component according to the exhaust temperature coordination control request flag and the work information, wherein the coordination control information of the coordination control component includes: the coordination component Active status word, active component control mode status word and closed-loop control sequence status word; a closed-loop control module of the coordination component, configured to determine a closed-loop control instruction based on the coordination control information and the work information; The coordination component execution module is configured to drive the corresponding coordinated control component to act based on the closed-loop control instruction, the work information and the coordinated control information. 8. The device according to claim 7, wherein the firing frequency management module comprises: a first determination submodule, configured to query a first look-up table based on the required torque and the engine speed to determine the firing frequency if the exhaust temperature management request flag is 0; The second determination sub-module is configured to query a second look-up table based on the required torque, the engine speed and the target exhaust gas temperature to determine the on-off of the ignition frequency if the exhaust temperature management request flag is 1 A loop control value, a closed-loop control value of the firing frequency is determined based on the open-loop control value, the target exhaust gas temperature, and the actual exhaust gas temperature, and the firing frequency is determined based on the closed-loop control value. 9. The apparatus according to claim 7, wherein the closed-loop control module of the coordination component comprises: a third determination submodule, configured to determine the upper limit value of the controller output based on the coordination component activation status word and the activation component control mode status word; The fourth determination sub-module is configured to determine the closed-loop control command based on the target exhaust gas temperature, the actual exhaust gas temperature, and an upper limit value output by the controller. 10 . An engine, wherein the engine uses the engine exhaust temperature management method according to any one of claims 1 to 6 . 11 .

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