Exhaust Gas Recirculation System Control Method, Storage Medium, and Vehicle

Abstract

The present application provides a method for controlling an exhaust gas recirculation system, a storage medium, and a vehicle, belonging to the technical field of automobiles. The method includes: when the exhaust gas recirculation system of the vehicle is in an open state, if the state parameters of the vehicle meet the monitoring conditions of the exhaust gas recirculation system, obtaining a misfire signal value of the engine, where the misfire signal value is used to represent the combustion state of the engine; counting the number of misfires of the engine according to the misfire signal value; and controlling the exhaust gas recirculation rate of the exhaust gas recirculation system based on the number of misfires of the engine. In this way, the exhaust gas recirculation rate is flexibly controlled by the misfire signal. When the combustion of the engine is abnormal, the exhaust gas recirculation rate can be timely reduced to reduce the exhaust gas entering the engine, thereby reducing the water vapor content in the intake air, and thus reducing the generation of condensate water to ensure the normal operation of the engine. In this way, while ensuring the maximum exhaust gas recirculation rate, the engine misfire fault is avoided.

Description

Technical Field

[0001] This application belongs to the technical field of automobiles, and particularly relates to a method for controlling an exhaust gas recirculation system, a storage medium, and a vehicle. Background Art

[0002] An exhaust gas recirculation system (EGR) is used to reintroduce the exhaust gas generated by engine combustion into the combustion chamber to participate in combustion. By mixing in the exhaust gas, the oxygen concentration of the air-fuel mixture in the combustion chamber is reduced, and the heat released by combustion is absorbed, thereby achieving the purpose of reducing the combustion speed and combustion temperature, and ultimately achieving the purpose of reducing nitrogen oxide (NOx) emissions and reducing fuel consumption.

[0003] In related technologies, the exhaust gas recirculation rate (EGR rate) is used to represent the ratio of the exhaust gas volume to the total intake air volume inhaled into the cylinder. Usually, in order to achieve a higher exhaust gas utilization rate and reduce fuel consumption, a higher EGR rate is selected for exhaust gas recirculation. However, since the discharged exhaust gas contains some water vapor, after the water vapor passes through the EGR condenser, it is mixed with the intake air passing through the air filter, and then enters the intercooler. After entering the intercooler, condensed water is generated due to the decrease in temperature. The condensed water accumulates on the fins of the intercooler, and as the condensed water accumulates on the fins of the intercooler, the condensed water will enter the engine cylinder along with the high-speed intake air flow, affecting the normal operation of the engine. Summary of the Invention

[0004] The purpose of this application is to provide a method for controlling an exhaust gas recirculation system, a storage medium, and a vehicle, aiming to solve the problem that the condensed water generated by the traditional exhaust gas recirculation system affects the normal operation of the engine.

[0005] The first aspect of the embodiment of this application provides a method for controlling an exhaust gas recirculation system, and the method includes:

[0006] When the exhaust gas recirculation system of the vehicle is in an open state, if the state parameters of the vehicle meet the exhaust gas recirculation system monitoring conditions, obtain the misfire signal value of the engine, and the misfire signal value is used to represent the combustion state of the engine;

[0007] Count the number of misfires of the engine according to the misfire signal value;

[0008] Based on the number of misfires of the engine, control the exhaust gas recirculation rate of the exhaust gas recirculation system.

[0009] In some embodiments, the controlling the exhaust gas recirculation rate of the exhaust gas recirculation system based on the number of misfires of the engine includes:

[0010] If, within the first counting period, the number of misfires of the engine reaches a first preset value, control the exhaust gas recirculation rate of the exhaust gas recirculation system to decrease to a first target value;

[0011] If, within the second counting period, the number of misfires of the engine reaches a second preset value, control the exhaust gas recirculation rate of the exhaust gas recirculation system to decrease to a second target value;

[0012] Wherein, the second counting period is less than the first counting period, and the second target value is less than the first target value.

[0013] In some embodiments, when the monitoring conditions of the exhaust gas recirculation system are satisfied, the method further includes:

[0014] Obtain the environmental humidity parameter of the environment where the vehicle is located;

[0015] According to the environmental humidity parameter, control the exhaust gas recirculation rate of the gas recirculation system.

[0016] In some embodiments, the environmental humidity parameter includes the continuous operation duration of the windshield wiper of the vehicle, and obtaining the environmental humidity parameter of the environment where the vehicle is located includes:

[0017] Obtain the operation duration of the windshield wiper of the vehicle;

[0018] The controlling the exhaust gas recirculation rate of the exhaust gas recirculation system according to the environmental humidity parameter includes:

[0019] If the operation duration reaches a first preset duration, control the exhaust gas recirculation rate of the exhaust gas recirculation system to decrease to a third target value.

[0020] In some embodiments, after controlling the exhaust gas recirculation rate of the exhaust gas recirculation system to decrease to the second target value, the method further includes:

[0021] Obtain the shutdown duration of the windshield wiper of the vehicle;

[0022] If the shutdown duration reaches a second preset duration, control the exhaust gas recirculation rate of the exhaust gas recirculation system to increase to a fourth target value.

[0023] In some embodiments, the counting the number of misfires of the engine according to the misfire signal value includes:

[0024] Within one counting period, if the obtained misfire signal value is greater than a preset threshold, increase the number of misfires of the engine by a target numerical value;

[0025] After the end of one counting period, clear the number of misfires and start the next counting period.

[0026] In some embodiments, determining whether the vehicle meets the exhaust gas recirculation system monitoring conditions includes:

[0027] Obtaining the engine speed and engine torque of the vehicle;

[0028] If the engine speed is within a preset speed range and the engine torque is within a preset torque range, it is determined that the exhaust gas recirculation system monitoring conditions are met.

[0029] In some embodiments, the method further includes:

[0030] Obtaining the engine water temperature, vehicle speed, engine intake air temperature of the vehicle, and the ambient temperature of the environment where the vehicle is located;

[0031] When the engine water temperature is within a preset temperature range, the vehicle speed is greater than a preset vehicle speed, the engine intake air temperature is greater than a first preset temperature, and the ambient temperature is greater than a second preset temperature, the exhaust gas recirculation system of the vehicle is turned on.

[0032] A second aspect of the embodiments of the present application provides an exhaust gas recirculation system control device, and the device includes:

[0033] A first acquisition unit, configured to, when the exhaust gas recirculation system of the vehicle is in an on state, if the state parameters of the vehicle meet the exhaust gas recirculation system monitoring conditions, acquire a misfire signal value of the engine, and the misfire signal value is used to represent the combustion state of the engine;

[0034] A statistics unit, configured to count the number of misfires of the engine according to the misfire signal value;

[0035] A control unit, configured to control the exhaust gas recirculation rate of the exhaust gas recirculation system based on the number of misfires of the engine.

[0036] In some embodiments, the control unit is configured to, if within a first counting period, the number of misfires of the engine reaches a first preset value, control the exhaust gas recirculation rate of the exhaust gas recirculation system to drop to a first target value; if within a second counting period, the number of misfires of the engine reaches a second preset value, control the exhaust gas recirculation rate of the exhaust gas recirculation system to drop to a second target value; wherein, the second counting period is less than the first counting period, and the second target value is less than the first target value.

[0037] In some embodiments, the device further includes:

[0038] A second acquisition unit, configured to acquire the ambient humidity parameter of the environment where the vehicle is located;

[0039] The control unit is configured to control the exhaust gas recirculation rate of the exhaust gas recirculation system according to the environmental humidity parameter.

[0040] In some embodiments, the environmental humidity parameter includes the continuous operation duration of the windshield wiper of the vehicle, and the second acquisition unit is configured to acquire the operation duration of the windshield wiper of the vehicle;

[0041] The control unit is configured to control the exhaust gas recirculation rate of the exhaust gas recirculation system to decrease to a third target value if the operation duration reaches a first preset duration.

[0042] In some embodiments, the second acquisition unit is configured to acquire the shutdown duration of the windshield wiper of the vehicle;

[0043] The control unit is configured to control the exhaust gas recirculation rate of the exhaust gas recirculation system to increase to a fourth target value if the shutdown duration reaches a second preset duration.

[0044] In some embodiments, the statistical unit is configured to, within one counting period, if the acquired misfire signal value is greater than a preset threshold, increase the misfire count of the engine by a target value; after one counting period ends, clear the misfire count and start the next counting period.

[0045] In some embodiments, the device further includes:

[0046] A third acquisition unit configured to acquire the engine speed and engine torque of the vehicle;

[0047] A determination unit configured to determine that the exhaust gas recirculation system monitoring condition is satisfied if the engine speed is within a preset speed range and the engine torque is within a preset torque range.

[0048] In some embodiments, the device further includes:

[0049] A fourth acquisition unit configured to acquire the engine water temperature, vehicle speed, engine intake temperature of the vehicle, and the environmental temperature of the environment where the vehicle is located;

[0050] An activation unit configured to activate the exhaust gas recirculation system of the vehicle when the engine water temperature is within a preset temperature range, the vehicle speed is greater than a preset vehicle speed, the engine intake temperature is greater than a first preset temperature, and the environmental temperature is greater than a second preset temperature.

[0051] A third aspect of the embodiments of the present application provides a computer-readable storage medium storing a computer program, which when executed by a processor implements the exhaust gas recirculation system control method as described above.

[0052] A fourth aspect of the embodiments of the present application provides a vehicle, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the exhaust gas recirculation system control method described above is implemented.

[0053] The beneficial effects of the embodiments of the present invention compared with the prior art are as follows:

[0054] In the embodiments of the present application, when the exhaust gas recirculation system is turned on, if the state parameters of the vehicle meet the detection conditions of the exhaust gas recirculation system, the misfire signal value of the engine is obtained, and the combustion state of the engine is determined through the misfire signal value. Then, the misfire times of the engine are counted based on the misfire signal value, and further, the exhaust gas recirculation rate of the exhaust gas recirculation system is controlled based on the misfire times of the engine. In this way, the exhaust gas recirculation rate is flexibly controlled through the misfire signal, and the exhaust gas recirculation rate of the exhaust gas recirculation system can be adjusted in a timely manner according to the combustion state of the engine. Thus, when the engine is burning normally, the exhaust gas can be circulated at a relatively large exhaust gas recirculation rate. When the combustion of the engine is abnormal, the exhaust gas recirculation rate can be reduced in a timely manner to reduce the exhaust gas entering the engine, and further reduce the water vapor content in the intake air, thereby reducing the generation of condensed water and ensuring the normal operation of the engine. In this way, while ensuring the maximum exhaust gas recirculation rate, the engine misfire fault is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 FIG. shows a schematic diagram of a control system involved in an exhaust gas recirculation system control method provided by an exemplary embodiment;

[0056] Figure 2 FIG. shows a schematic flow diagram of an exhaust gas recirculation system control method provided by an exemplary embodiment;

[0057] Figure 3 FIG. shows a schematic flow diagram of an exhaust gas recirculation system control method provided by an exemplary embodiment;

[0058] Figure 4 FIG. shows a schematic flow diagram of an exhaust gas recirculation system control method provided by an exemplary embodiment;

[0059] Figure 5 FIG. shows a schematic structural diagram of an exhaust gas recirculation system control device provided by an exemplary embodiment;

[0060] Figure 6 is a schematic structural diagram of a vehicle provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0061] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clear and understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0062] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0063] In order to reduce the fuel consumption of the engine, configuring an Exhaust Gas Recirculation (EGR) system for the vehicle is the current preferred solution. Through EGR, the exhaust gas generated by the engine combustion is reintroduced into the combustion chamber to participate in combustion. By mixing in the exhaust gas, the oxygen concentration of the air-fuel mixture in the combustion chamber is reduced, and the heat released by combustion is absorbed, thereby achieving the purpose of reducing the combustion speed and the combustion temperature, and ultimately achieving the purpose of reducing the emissions of nitrogen oxides (NOx) and reducing the fuel consumption.

[0064] In practical applications, the exhaust gas recirculation rate (EGR rate) is used to represent the ratio of the exhaust gas volume to the total intake air volume inhaled into the cylinder. In some embodiments, usually in order to achieve a higher exhaust gas utilization rate and reduce fuel consumption, a higher EGR rate is selected for exhaust gas recirculation. However, since the exhaust gas discharged contains some water vapor, after the water vapor passes through the EGR condenser, it mixes with the intake air passing through the air filter and then enters the intercooler. After entering the intercooler, condensate is generated due to the decrease in temperature. The condensate accumulates on the fins of the intercooler. As the condensate accumulates on the fins of the intercooler, the condensate will enter the engine cylinder along with the high-speed intake air flow, affecting the normal operation of the engine and resulting in engine misfires and abnormal air-fuel mixtures.

[0065] The present application provides a method for controlling an exhaust gas recirculation system, a vehicle, and a storage medium. When the exhaust gas recirculation system is turned on, if the state parameters of the vehicle meet the detection conditions of the exhaust gas recirculation system, the misfire signal value of the engine is obtained, and the combustion state of the engine is determined based on this misfire signal value. Then, the misfire count of the engine is statistically calculated based on this misfire signal value, and further, the exhaust gas recirculation rate of the exhaust gas recirculation system is controlled based on the misfire count of the engine. In this way, the exhaust gas recirculation rate is flexibly controlled by the misfire signal, and the exhaust gas recirculation rate of the exhaust gas recirculation system can be adjusted in a timely manner according to the combustion state of the engine. Thus, when the engine is burning normally, the exhaust gas can be recirculated at a relatively large exhaust gas recirculation rate. When the combustion of the engine is abnormal, the exhaust gas recirculation rate can be reduced in a timely manner to reduce the exhaust gas entering the engine, and further reduce the water vapor content in the intake air, thereby reducing the generation of condensed water and ensuring the normal operation of the engine. In this way, while ensuring the maximum exhaust gas recirculation rate, engine misfire faults are avoided.

[0066] See Figure 1 , which shows a schematic diagram of the control system involved in the exhaust gas recirculation system control method provided by an exemplary embodiment. See Figure 1 , the control system includes a vehicle controller 10, an engine controller 20, and a driving parameter perception system 30. Among them, the vehicle controller 10 is respectively connected to the engine controller 20 and the driving parameter perception system 30.

[0067] The driving parameter perception system 30 includes various sensors or other devices for obtaining different driving parameters of the vehicle. For example, the driving parameter perception system 30 includes a vehicle speed sensor for detecting the driving speed of the vehicle and sending the driving speed of the vehicle to the vehicle controller 10. For another example, the driving parameter perception system 30 further includes an engine state sensor for detecting the operating states such as the engine speed, engine water temperature, and engine intake air temperature, and sending the operating state of the engine to the engine controller 20.

[0068] The vehicle controller 10 is used to receive the driving parameters of the vehicle sent by the driving parameter perception system 30, obtain the misfire signal value on the CAN matrix, generate a control command based on the driving parameters and the misfire signal value, and send the control command to the engine controller 20. The engine controller 20 is used to control the exhaust gas recirculation rate of the exhaust gas recirculation system of the engine when receiving the control command.

[0069] The following describes the present application in conjunction with specific embodiments. See Figure 2 , which shows a flowchart of the exhaust gas recirculation system control method provided by an exemplary embodiment. By way of example and not limitation, this method is applied to a vehicle configured with the above control system.

[0070] S201. When the exhaust gas recirculation system of the vehicle is in an open state, if the state parameters of the vehicle meet the monitoring conditions of the exhaust gas recirculation system, the vehicle obtains the misfire signal value of the engine, and this misfire signal value is used to represent the combustion state of the engine.

[0071] This misfire signal value can be obtained by the vehicle using the CAN matrix through the vehicle control unit. Among them, each time the engine ignites, a misfire signal for this ignition is generated, and the value of this misfire signal is determined by the combustion state of the engine. In some embodiments, this misfire signal value can be related to the rotational speed operating state of the engine. Among them, the better the rotational speed state, the smaller the possibility of engine misfire, and the smaller the misfire signal value; the worse the rotational speed state, the greater the possibility of engine misfire, and the greater the misfire signal value.

[0072] In some embodiments, the user can manually turn on the exhaust gas recirculation system. Correspondingly, when the vehicle receives the start command input by the user, the exhaust gas recirculation system is started based on this start command. In other embodiments, the vehicle can also detect the driving parameters of the vehicle and determine whether to start the exhaust gas recirculation system based on the driving parameters of the vehicle. Correspondingly, the vehicle obtains the engine water temperature, vehicle speed, engine intake air temperature of the vehicle, and the ambient temperature of the environment where the vehicle is located; when the engine water temperature is within a preset temperature range, and the vehicle speed is greater than a preset vehicle speed, and the engine intake air temperature is greater than a first preset temperature, and the ambient temperature is greater than a second preset temperature, the exhaust gas recirculation system of the vehicle is turned on.

[0073] Among them, the preset temperature range, preset vehicle speed, first preset temperature, and second preset temperature can be set as needed. In the embodiments of the present application, no specific limitations are made in this regard. For example, the preset temperature range can be [60 - 108] degrees Celsius; the preset vehicle speed can be 20 kilometers per hour, 22 kilometers per hour, or 25 kilometers per hour, etc.; the first preset temperature can be 5 degrees Celsius, 8 degrees Celsius, or 8 degrees Celsius, etc.; the second preset temperature can be 3 degrees Celsius, 4 degrees Celsius, or 5 degrees Celsius, etc.

[0074] In this implementation manner, by detecting the driving parameters of the vehicle to detect whether to automatically turn on the exhaust gas recirculation system, when it is detected that the driving parameters meet the opening conditions of the exhaust gas recirculation system, the vehicle automatically turns on the exhaust gas recirculation system, which can timely turn on the exhaust gas recirculation system according to the driving parameters of the vehicle, thereby timely meeting the requirements of reducing fuel consumption and reducing NOX pollutant emissions.

[0075] After the vehicle activates the exhaust gas recirculation system, the vehicle can directly initiate a strategy to control the exhaust gas recirculation rate, that is, after the vehicle activates the exhaust gas recirculation system, the vehicle acquires the misfire signal value of the engine. The vehicle can also continue to determine whether the conditions for monitoring the exhaust gas recirculation system are met based on the state of the vehicle, that is, after the vehicle activates the exhaust gas recirculation system, it determines whether the state of the vehicle meets the conditions for monitoring the exhaust gas recirculation system. If the conditions for monitoring the exhaust gas recirculation system are met, the vehicle performs the step of acquiring the misfire signal value of the engine.

[0076] Among them, the vehicle can determine whether the vehicle meets the conditions for detecting the exhaust gas recirculation system based on the engine speed and engine torque. Accordingly, the vehicle acquires the engine speed and engine torque of the vehicle. If the engine speed is within a preset speed range and the engine torque is within a preset torque range, it is determined that the conditions for monitoring the exhaust gas recirculation system are met.

[0077] The preset speed range and the preset torque range can be set as needed. In the embodiments of the present application, the preset speed range and the preset torque range are not specifically limited. For example, the preset speed range can be [1000 - 5000] revolutions per minute; the preset torque range can be [70 - 170] N, etc.

[0078] In this implementation, the vehicle activates the control logic of the exhaust gas recirculation rate only when the conditions for monitoring the exhaust gas recirculation system are met. In this way, when the conditions for monitoring the exhaust gas recirculation system are met and it is determined that a misfire phenomenon may occur, monitoring starts, thereby reducing the energy consumption generated by monitoring.

[0079] S202, the vehicle counts the number of misfires of the engine based on the misfire signal value.

[0080] A suspected misfire counter can be configured in the vehicle, and the number of misfires of the engine is counted based on the suspected misfire counter. For example, a preset threshold can be set, and when the misfire signal value is greater than the preset threshold, the count of the suspected misfire counter increases.

[0081] In some embodiments, the vehicle periodically counts the number of misfires of the engine. Accordingly, within one counting cycle, when the acquired misfire signal value is greater than the preset threshold, the number of misfires of the engine is increased by a target value; after one counting cycle ends, the number of misfires is cleared, and the next counting cycle is started.

[0082] Within some counting cycles, after the vehicle counts the acquired misfire signal value, the misfire signal value is compared with the preset threshold. If the misfire signal value is greater than the preset threshold, the count of the suspected misfire counter is increased by a target value. If the misfire signal value is not greater than the preset threshold, the count of the suspected misfire counter remains unchanged.

[0083] The preset threshold can be calibrated according to the misfire signal value of the vehicle when the engine misfires. For example, when the engine misfires, the misfire signal value of the vehicle is determined as the preset threshold; or, the preset threshold can be based on the product of the misfire signal value of the vehicle and the threshold parameter when the engine misfires. The threshold parameter can be set as needed. In the embodiments of the present application, the threshold parameter is not specifically limited. For example, the threshold parameter can be 75% or 65%, etc. The target value is an integer greater than 0. In the embodiments of the present application, the target value can be set as needed. In the embodiments of the present application, the target value is not specifically limited. For example, the target value can be 1 or 2, etc.

[0084] Among them, the counting period can be set as a time period. For example, the vehicle takes a preset duration as a counting period. The preset duration can be set as needed. In the embodiments of the present application, the preset duration is not specifically limited. The counting period can also be set as the engine ignition number period. For example, the vehicle takes a preset ignition number as a counting period. The preset ignition number can be set as needed. In the embodiments of the present application, the preset ignition number is not specifically limited. For example, the preset ignition number can be 2000 times, 1000 times or 500 times, etc.

[0085] S203, the vehicle controls the exhaust gas recirculation rate of the exhaust gas recirculation system based on the misfire number of the engine.

[0086] When the misfire number of the engine reaches the preset value, the vehicle controls the exhaust gas recirculation rate of the exhaust gas recirculation system to decrease.

[0087] The vehicle can set at least one counting period to count the misfire number of the engine. When the vehicle sets one counting period, when the misfire number of the engine reaches the preset number within this counting period, the vehicle controls the exhaust gas recirculation rate to decrease. The vehicle can also set multiple counting periods. Different counting periods set different preset values and target values. In different situations, the exhaust gas recirculation rate of the exhaust gas recirculation system is controlled to decrease to different target values, so as to achieve the purpose of flexibly controlling the exhaust gas recirculation rate. Taking the vehicle setting two counting periods as an example, correspondingly, if the misfire number of the engine reaches the first preset value within the first counting period, the exhaust gas recirculation rate of the exhaust gas recirculation system is controlled to decrease to the first target value; if the misfire number of the engine reaches the second preset value within the second counting period, the exhaust gas recirculation rate of the exhaust gas recirculation system is controlled to decrease to the second target value; among them, the second counting period is less than the first counting period, and the second target value is less than the first target value.

[0088] See Figure 3, which shows a flowchart of a method for controlling the exhaust gas recirculation rate of a vehicle in two counting cycles in an exemplary embodiment. Refer to Figure 3 , when the vehicle obtains driving parameters, it determines whether the driving parameters meet the start condition of the exhaust gas recirculation system. When the condition is met, the exhaust gas recirculation system is started, and it is determined whether it is necessary to monitor the misfire signal. The engine speed and engine torque are obtained. If the engine speed and engine torque meet the condition for starting to detect the misfire signal, the misfire signal value of the vehicle is obtained. When the misfire signal value is greater than the preset threshold, the count is incremented by 1. At the same time, it is determined whether the count value in the two counting cycles reaches the preset value corresponding to the counting cycle. If it reaches the preset value corresponding to the counting cycle, the exhaust gas recirculation rate of the vehicle's exhaust gas recirculation system is decreased to the corresponding target value.

[0089] Among them, the first counting cycle, the second counting cycle, the first preset value, the second preset value, the first target value, and the second target value can be set as needed. In the embodiments of the present application, no specific limitations are made thereto.

[0090] For example, the first counting cycle is 2000 times, the first preset value corresponding to the first counting cycle is 500, and the first target value is 50% of the original exhaust gas recirculation rate; the second counting cycle is 500, the second threshold corresponding to the second counting cycle is 100, and the second target value is 0% of the original exhaust gas recirculation rate. Correspondingly, when the vehicle starts to count the number of misfires, the two counting cycles count independently. When the number of misfires in any counting cycle reaches the preset value corresponding to the counting cycle, the exhaust gas recirculation rate of the vehicle's exhaust gas recirculation system is decreased to the corresponding target value. When a counting cycle ends and the number of misfires does not reach the corresponding preset value, the count of the counter is cleared, and a new counting cycle is restarted to count.

[0091] It should be noted that the number of counting cycles can be set as needed. In the embodiments of the present application, no specific limitations are made to the number of counting cycles. The vehicle can set more or fewer counting cycles for misfire counting. In the embodiments of the present application, no specific limitations are made to the number of counting cycles.

[0092] In this implementation manner, by setting multiple counting cycles, different preset values and target values are set for different counting cycles, and in different situations, the exhaust gas recirculation rate of the exhaust gas recirculation system is controlled to decrease to different target values, so as to achieve the purpose of flexibly controlling the exhaust gas recirculation rate.

[0093] Another point to note is that after adjusting the exhaust gas recirculation rate, the vehicle can continue to detect misfire signals. When the misfire signals return to normal, the exhaust gas recirculation rate of the exhaust gas recirculation system is increased again. For example, continue to count the number of misfires within a counting period. When the number of misfires within the counting period is less than a third preset value, control the exhaust gas recirculation rate of the exhaust gas recirculation system to rise to a corresponding fifth target value.

[0094] In addition, in the embodiments of the present application, the exhaust gas recirculation rate can be adjusted by adjusting the opening degree of the intake valve of the exhaust gas recirculation system. When it is necessary to reduce the exhaust gas recirculation rate, the valve opening degree can be reduced. When it is necessary to increase the exhaust gas recirculation rate, the valve opening degree can be increased.

[0095] In the embodiments of the present application, when the exhaust gas recirculation system is turned on, if the state parameters of the vehicle meet the detection conditions of the exhaust gas recirculation system, the misfire signal value of the engine is obtained, and the combustion state of the engine is determined through this misfire signal value. Then, the number of misfires of the engine is counted based on this misfire signal value, and further, the exhaust gas recirculation rate of the exhaust gas recirculation system is controlled based on the number of misfires of the engine. In this way, the exhaust gas recirculation rate is flexibly controlled through the misfire signal, and the exhaust gas recirculation rate of the exhaust gas recirculation system can be adjusted in a timely manner according to the combustion state of the engine. Thus, when the engine is burning normally, the exhaust gas can be recirculated at a relatively large exhaust gas recirculation rate. When the engine combustion is abnormal, the exhaust gas recirculation rate can be reduced in a timely manner to reduce the exhaust gas entering the engine, and then reduce the water vapor content in the intake air, thereby reducing the generation of condensate water and ensuring the normal operation of the engine. In this way, while ensuring the maximum exhaust gas recirculation rate, engine misfire faults are avoided.

[0096] Since condensate water may combine with water vapor in the air when it is generated, the humidity of the environment where the vehicle is located also affects the generation of condensate water, and thus affects the operation of the engine. Therefore, in some embodiments, the vehicle can also control the exhaust gas recirculation system of the vehicle in combination with the environmental humidity parameter of the environment where the vehicle is located. Refer to Figure 4 , which shows a flowchart of an exhaust gas recirculation system control method provided by an exemplary embodiment. By way of example and not limitation, this method is applied to a vehicle.

[0097] S401, in a state where the exhaust gas recirculation system of the vehicle is turned on, if the state parameters of the vehicle meet the exhaust gas recirculation system monitoring conditions, the vehicle obtains the environmental humidity parameter of the environment where the vehicle is located.

[0098] The ambient humidity parameter is used to represent the air humidity of the environment where the vehicle is located. In some embodiments, the vehicle can obtain the ambient humidity of the environment where the vehicle is located according to a humidity sensor. In other embodiments, the vehicle can use the running duration of the vehicle's windshield wiper as the ambient humidity parameter, that is, when the vehicle is driving in rainy weather or high air humidity, it may be necessary to continuously turn on the windshield wiper. Therefore, the longer the running duration of the windshield wiper, the greater the control humidity and the higher the ambient humidity parameter. Accordingly, the vehicle can obtain the running duration of the windshield wiper for the rainfall amount.

[0099] S402, the vehicle controls the exhaust gas recirculation rate of the exhaust gas recirculation system according to the ambient humidity parameter.

[0100] When the ambient humidity parameter is high, reduce the exhaust gas recirculation rate of the exhaust gas recirculation system.

[0101] When the ambient humidity parameter is the running duration of the windshield wiper, if the running duration reaches a first preset duration, control the exhaust gas recirculation rate of the exhaust gas recirculation system to drop to a third target value.

[0102] Wherein, the first preset duration and the third target value can be set as needed. In the embodiments of the present application, the first preset duration and the third target value are not specifically limited. For example, the first preset duration is 15 minutes, 10 minutes or 20 minutes, etc. The first target value can be 50% of the original exhaust gas recirculation rate or 0% of the original exhaust gas recirculation rate, etc.

[0103] It should be noted that after reducing the exhaust gas recirculation rate, the vehicle can continue to detect the running state of the windshield wiper. When it is detected that the windshield wiper is turned off, the vehicle can also re-control the exhaust gas recirculation rate to rise. In some embodiments, obtain the off duration of the vehicle's windshield wiper; if the off duration reaches a second preset duration, control the exhaust gas recirculation rate of the exhaust gas recirculation system to rise to a fourth target value.

[0104] Wherein, the second preset duration and the fourth target value can be set as needed. In the embodiments of the present application, the second preset duration and the fourth target value are not specifically limited. For example, the second preset duration is 20 minutes, 25 minutes or 30 minutes, etc.; the fourth target value can be the original exhaust gas recirculation rate, etc.

[0105] In this implementation manner, when it is detected that the windshield wiper is turned off, the vehicle determines that the current ambient humidity is low and can restart the exhaust gas recirculation system. When it is detected that the off duration of the windshield wiper reaches the second preset duration, the exhaust gas recirculation rate is controlled to rise, preventing the problem of the exhaust gas recirculation rate rising caused by accidental touch of the windshield wiper.

[0106] In the embodiments of the present application, when the exhaust gas recirculation system is turned on, if the state parameters of the vehicle meet the detection conditions of the exhaust gas recirculation system, the environmental humidity parameter of the environment where the vehicle is located is obtained, and the humidity of the environment where the vehicle is located is determined through this environmental humidity parameter, so as to control the exhaust gas circulation rate of the exhaust gas recirculation system according to the environmental humidity. In this way, the exhaust gas circulation rate can be adjusted according to the environment where the vehicle is located. Thus, when the air humidity is low, the exhaust gas can be circulated at a relatively large exhaust gas circulation rate. When the air humidity is high, the exhaust gas circulation rate can be reduced in time to reduce the exhaust gas entering the engine, and further reduce the water vapor content in the intake air, thereby reducing the generation of condensed water and ensuring the normal operation of the engine. In this way, while ensuring the maximum exhaust gas circulation rate, the engine misfire fault is avoided.

[0107] It should be noted that the vehicle can also control the exhaust gas circulation rate in combination with the misfire signal and the environmental humidity parameter of the environment where the vehicle is located. For example, when the number of misfires of the engine detected by the vehicle reaches a preset value within a counting cycle, and / or the environmental humidity parameter meets the control conditions, the exhaust gas circulation rate is controlled to decrease.

[0108] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution. The execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0109] See Figure 5 , which shows a schematic structural diagram of an exhaust gas recirculation system control device provided by the present application. Each unit included is used to execute each step in the above embodiments. See Figure 5 , the exhaust gas recirculation system control device includes:

[0110] The first acquisition unit 501 is configured to obtain the misfire signal value of the engine when the exhaust gas recirculation system of the vehicle is in an on state, and if the state parameters of the vehicle meet the monitoring conditions of the exhaust gas recirculation system. This misfire signal value is used to represent the combustion state of the engine;

[0111] The statistics unit 502 is configured to count the number of misfires of the engine according to the misfire signal value;

[0112] The control unit 503 is configured to control the exhaust gas circulation rate of the exhaust gas recirculation system based on the number of misfires of the engine.

[0113] In some embodiments, the control unit 503 is configured to, if the number of misfires of the engine reaches a first preset value within a first counting period, control the exhaust gas recirculation rate of the exhaust gas recirculation system to decrease to a first target value; if the number of misfires of the engine reaches a second preset value within a second counting period, control the exhaust gas recirculation rate of the exhaust gas recirculation system to decrease to a second target value; wherein, the second counting period is less than the first counting period, and the second target value is less than the first target value.

[0114] In some embodiments, the device further comprises:

[0115] a second acquisition unit, configured to acquire an environmental humidity parameter of the environment where the vehicle is located;

[0116] the control unit 503 is configured to control the exhaust gas recirculation rate of the exhaust gas recirculation system according to the environmental humidity parameter.

[0117] In some embodiments, the environmental humidity parameter includes the continuous operation duration of the windshield wiper of the vehicle, and the second acquisition unit is configured to acquire the operation duration of the windshield wiper of the vehicle;

[0118] the control unit 503 is configured to, if the operation duration reaches a first preset duration, control the exhaust gas recirculation rate of the exhaust gas recirculation system to decrease to a third target value.

[0119] In some embodiments, the second acquisition unit is configured to acquire the shutdown duration of the windshield wiper of the vehicle;

[0120] the control unit 503 is configured to, if the shutdown duration reaches a second preset duration, control the exhaust gas recirculation rate of the exhaust gas recirculation system to increase to a fourth target value.

[0121] In some embodiments, the statistics unit 502 is configured to, if the acquired misfire signal value is greater than a preset threshold within a counting period, increase the number of misfires of the engine by a target value; after a counting period ends, clear the number of misfires and start the next counting period.

[0122] In some embodiments, the device further comprises:

[0123] a third acquisition unit, configured to acquire the engine speed and engine torque of the vehicle;

[0124] a determination unit, configured to determine that the exhaust gas recirculation system monitoring condition is satisfied if the engine speed is within a preset speed range and the engine torque is within a preset torque range.

[0125] In some embodiments, the device further comprises:

[0126] A fourth acquisition unit, configured to acquire the engine water temperature, vehicle speed, engine intake air temperature of the vehicle, and the ambient temperature of the environment where the vehicle is located;

[0127] An activation unit, configured to activate the exhaust gas recirculation system of the vehicle when the engine water temperature is within a preset temperature range, the vehicle speed is greater than a preset vehicle speed, the engine intake air temperature is greater than a first preset temperature, and the ambient temperature is greater than a second preset temperature.

[0128] In an embodiment of the present application, when the exhaust gas recirculation system is activated, if the state parameters of the vehicle meet the detection conditions of the exhaust gas recirculation system, an engine misfire signal value is acquired, and the combustion state of the engine is determined based on the misfire signal value. Thus, the number of engine misfires is counted based on the misfire signal value, and then the exhaust gas recirculation rate of the exhaust gas recirculation system is controlled based on the number of engine misfires. In this way, the exhaust gas recirculation rate is flexibly controlled through the misfire signal, and the exhaust gas recirculation rate of the exhaust gas recirculation system can be adjusted in a timely manner according to the combustion state of the engine. Therefore, when the engine is burning normally, the exhaust gas can be circulated at a relatively large exhaust gas recirculation rate. When the engine combustion is abnormal, the exhaust gas recirculation rate can be reduced in a timely manner to reduce the exhaust gas entering the engine, thereby reducing the water vapor content in the intake air and further reducing the generation of condensed water, ensuring the normal operation of the engine. In this way, while ensuring the maximum exhaust gas recirculation rate, engine misfire faults are avoided.

[0129] Figure 6 is a schematic diagram of a vehicle provided by an exemplary embodiment of the present application. As Figure 6 shown, the vehicle 6 of this embodiment includes: a processor 60, a memory 61, and a computer program 62 stored in the memory 61 and executable on the processor 60, such as an exhaust gas recirculation system control program. When the processor 60 executes the computer program 62, the steps in the above-mentioned various embodiments of the exhaust gas recirculation system control method are implemented, such as Figure 2 the steps S201 to S203 shown. Alternatively, when the processor 60 executes the computer program 62, the functions of each unit in the above-mentioned device embodiments are implemented, such as Figure 5 the functions of the first acquisition unit 501, the statistics unit 502, and the control unit 503 shown.

[0130] Exemplarily, the computer program 62 can be divided into one or more units. The one or more units are stored in the memory 61 and executed by the processor 60 to complete the present application. The one or more units can be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the execution process of the computer program 62 in the vehicle 6. For example, the computer program 62 can be divided into a first acquisition unit 501, a statistics unit 502, and a control unit 503. The specific functions of each module are as follows:

[0131] A first acquisition unit 501 is configured to obtain a misfire signal value of an engine when the status parameter of the vehicle meets the exhaust gas recirculation system monitoring condition in a state where the exhaust gas recirculation system of the vehicle is turned on, and the misfire signal value is used to represent the combustion state of the engine;

[0132] A statistics unit 502 is configured to count the number of misfires of the engine according to the misfire signal value;

[0133] A control unit 503 is configured to control the exhaust gas recirculation rate of the exhaust gas recirculation system based on the number of misfires of the engine.

[0134] The vehicle 6 may be any vehicle with a control function. The vehicle 6 may include, but is not limited to, a processor 60 and a memory 61. Those skilled in the art can understand that Figure 6 merely being examples of the vehicle 6 does not constitute a limitation on the vehicle 6, and may include more or fewer components than shown in the figure, or combine certain components, or different components. For example, the vehicle 6 may further include an input / output device, a network access device, a bus, etc.

[0135] The so-called processor 60 may be a central processing unit (CPU), or may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0136] The memory 61 may be an internal storage unit of the vehicle 6, such as a hard disk or memory of the vehicle 6. The memory 61 may also be an external storage device of the vehicle 6, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the vehicle 6. Further, the memory 61 may also include both the internal storage unit and the external storage device of the vehicle 6. The memory 61 is used to store the computer program and other programs and data required by the terminal device. The memory 61 may also be used to temporarily store data that has been output or will be output.

[0137] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be allocated to different functional units and modules according to needs, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. In addition, the specific names of the functional units and modules are only for the convenience of mutual distinction and do not limit the protection scope of the present application. The specific working processes of the units and modules in the above system can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0138] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For parts not described or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0139] Those of ordinary skill in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or by a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0140] In the embodiments provided in the present application, it should be understood that the disclosed device / terminal device and method can be implemented in other ways. For example, the device / terminal device embodiments described above are merely illustrative. For example, the division of the module or unit is only a logical function division, and there can be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces, and the indirect coupling or communication connection of the device or unit can be in an electrical, mechanical or other form.

[0141] The unit described as a separated component may or may not be physically separated, and the component displayed as a unit may or may not be a physical unit, that is, it can be located in one place, or can be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0142] In addition, in each embodiment of the present application, each functional unit may be integrated into a processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of a software functional unit.

[0143] If the above-mentioned integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium. Based on such an understanding, to implement all or part of the processes in the above-mentioned embodiment methods of the present application, it may also be completed by instructing relevant hardware through a computer program. The computer program may be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above-mentioned various method embodiments may be implemented. Among them, the computer program includes computer program code, and the computer program code may be in the form of source code, object code, executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer-readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0144] The embodiment of the present application also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps in the above-mentioned various method embodiments are implemented.

[0145] The embodiment of the present application also provides a computer program product. When the computer program product runs on a mobile terminal, the mobile terminal can be made to execute the steps in the above-mentioned various method embodiments when executed.

[0146] The above-mentioned embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A method for controlling an exhaust gas recirculation system, characterized in that: The method comprises: When the exhaust gas recirculation system of the vehicle is turned on, if the state parameters of the vehicle meet the exhaust gas recirculation system monitoring conditions, obtaining a misfire signal value of the engine, wherein the misfire signal value is used to indicate the combustion state of the engine; Counting the number of misfires of the engine according to the misfire signal value; Simultaneously determining within two counting cycles whether the number of misfires of the engine reaches a preset value corresponding to the counting cycle; If the number of misfires of the engine reaches a first preset value within a first counting period, controlling the exhaust gas circulation rate of the exhaust gas recirculation system to decrease to a first target value; If the number of misfires of the engine reaches a second preset value within a second counting period, controlling the exhaust gas circulation rate of the exhaust gas recirculation system to decrease to a second target value; The second counting period is smaller than the first counting period, and the second target value is smaller than the first target value.

2. The method according to claim 1, characterized in that When the exhaust gas recirculation system monitoring condition is met, the method further includes: Acquire an ambient humidity parameter of the environment where the vehicle is located; The exhaust gas circulation rate of the exhaust gas recirculation system is controlled according to the ambient humidity parameter.

3. The method according to claim 2, characterized in that The environmental humidity parameter includes the continuous operation time of the wiper of the vehicle, and the step of obtaining the environmental humidity parameter of the environment where the vehicle is located includes: Obtaining the operation duration of the wiper of the vehicle; The step of controlling the exhaust gas circulation rate of the exhaust gas recirculation system according to the ambient humidity parameter comprises: If the operation duration reaches a first preset duration, the exhaust gas circulation rate of the exhaust gas recirculation system is controlled to decrease to a third target value.

4. The method according to claim 3, characterized in that After the exhaust gas circulation rate of the exhaust gas recirculation system is controlled to decrease to a second target value, the method further includes: Obtaining the duration of the windshield wiper being turned off for the vehicle; If the shutdown duration reaches a second preset duration, the exhaust gas circulation rate of the exhaust gas recirculation system is controlled to increase to a fourth target value.

5. The method according to claim 1, characterized in that The counting of the number of misfires of the engine according to the misfire signal value comprises: In a counting cycle, if the misfire signal value obtained is greater than a preset threshold, the number of misfires of the engine is increased by a target value; After a counting cycle ends, the number of misfires is reset to zero and the next counting cycle is started.

6. The method according to claim 1, characterized in that Determining whether the vehicle meets the exhaust gas recirculation system monitoring conditions, including: obtaining an engine speed and an engine torque of the vehicle; If the engine speed is within a preset speed range, and the engine torque is within a preset torque range, it is determined that the exhaust gas recirculation system monitoring condition is met.

7. The method according to claim 1, characterized in that The method further comprises: Obtaining the engine water temperature, vehicle speed, engine intake temperature and ambient temperature of the environment in which the vehicle is located; When the engine water temperature is within a preset temperature range, the vehicle speed is greater than a preset vehicle speed, the engine intake temperature is greater than a first preset temperature, and the ambient temperature is greater than a second preset temperature, the exhaust gas recirculation system of the vehicle is turned on.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the exhaust gas recirculation system control method according to any one of claims 1 to 7 is implemented.

9. A vehicle, characterized in that: The vehicle includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor executes the computer program to implement the exhaust gas recirculation system control method according to any one of claims 1 to 7.

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