Exhaust gas recirculation system control method, storage medium and vehicle

Abstract

The invention provides an exhaust gas recirculation system control method, a storage medium and a vehicle, and belongs to the technical field of automobiles. The method comprises the steps that in the state that an exhaust gas recirculation system of the vehicle is started, if state parameters of the vehicle meet exhaust gas recirculation system monitoring conditions, a misfire signal value of an engine is obtained, and the misfire signal value is sent to the engine; the misfire signal value is used for representing the combustion state of the engine; counting the number of misfire times of the engine according to the misfire signal value; and the exhaust gas circulation rate of the exhaust gas recirculation system is controlled based on the misfire number of the engine. In this way, the waste gas circulation rate is flexibly controlled through the misfire signal, when engine combustion is abnormal, the waste gas circulation rate can be reduced in time so as to reduce waste gas entering the engine, and then the content of water vapor in inlet gas is reduced, so that generation of condensate water is reduced, and normal operation of the engine is guaranteed; therefore, the maximum waste gas circulation rate is guaranteed, and meanwhile the engine fire fault is avoided.

Description

Technical Field

[0001] The present application belongs to the field of automobile technology, and in particular relates to an exhaust gas recirculation system control method, a storage medium and a vehicle. Background Art

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

[0003] In the related art, the exhaust gas circulation rate (EGR rate) is used to represent the ratio of the exhaust gas volume to the total intake air sucked 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 exhaust gas contains some water vapor, the water vapor mixes with the intake air that passes through the air filter after passing through the EGR condenser, and then enters the intercooler. After entering the intercooler, condensed water will be generated due to the decrease in temperature. The condensed water condenses on the fins of the intercooler. 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 the present application is to provide an exhaust gas recirculation system control method, a storage medium and a vehicle, aiming to solve the problem that condensed water generated by a traditional exhaust gas recirculation system affects the normal operation of the engine.

[0005] A first aspect of an embodiment of the present application provides an exhaust gas recirculation system control method, the method comprising: 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; Based on the number of misfires of the engine, an exhaust gas circulation rate of the exhaust gas recirculation system is controlled.

[0006] In some embodiments, controlling the exhaust gas circulation rate of the exhaust gas recirculation system based on the number of misfires of the engine includes: 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.

[0007] In some embodiments, 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.

[0008] In some embodiments, 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 in which 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.

[0009] In some embodiments, after controlling the exhaust gas circulation rate of the exhaust gas recirculation system 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.

[0010] In some embodiments, counting the number of misfires of the engine according to the misfire signal value includes: 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.

[0011] In some embodiments, determining whether the vehicle meets the exhaust gas recirculation system monitoring condition includes: 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.

[0012] In some embodiments, 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.

[0013] A second aspect of an embodiment of the present application provides an exhaust gas recirculation system control device, the device comprising: A first acquisition unit is used to acquire a misfire signal value of the engine when the exhaust gas recirculation system of the vehicle is turned on and if the state parameter of the vehicle meets the exhaust gas recirculation system monitoring condition, wherein the misfire signal value is used to indicate the combustion state of the engine; A statistical unit, used for counting the number of misfires of the engine according to the misfire signal value; A control unit is used to control the exhaust gas circulation rate of the exhaust gas recirculation system based on the number of misfires of the engine.

[0014] In some embodiments, the control unit is used to control the exhaust gas circulation rate of the exhaust gas recirculation system to drop to a first target value if the number of misfires of the engine reaches a first preset value within a first counting cycle; and to control the exhaust gas circulation rate of the exhaust gas recirculation system to drop to a second target value if the number of misfires of the engine reaches a second preset value within a second counting cycle; wherein the second counting cycle is smaller than the first counting cycle, and the second target value is smaller than the first target value.

[0015] In some embodiments, the apparatus further comprises: A second acquisition unit, used to acquire an environmental humidity parameter of the environment where the vehicle is located; The control unit is used to control the exhaust gas circulation rate of the exhaust gas recirculation system according to the ambient humidity parameter.

[0016] In some embodiments, the environmental humidity parameter includes the continuous operation time of the wiper of the vehicle, and the second acquisition unit is used to acquire the operation time of the wiper of the vehicle; The control unit is used to control the exhaust gas circulation rate of the exhaust gas recirculation system to drop to a third target value if the operation duration reaches a first preset duration.

[0017] In some embodiments, the second acquisition unit is used to acquire the duration of the vehicle's windshield wiper being turned off; The control unit is used to control the exhaust gas circulation rate of the exhaust gas recirculation system to increase to a fourth target value if the shutdown duration reaches a second preset duration.

[0018] In some embodiments, the statistical unit is used to increase the number of misfires of the engine by a target value if the misfire signal value obtained within a counting cycle is greater than a preset threshold; after a counting cycle ends, the number of misfires is cleared to zero and the next counting cycle is started.

[0019] In some embodiments, the apparatus further comprises: a third acquisition unit, configured to acquire an engine speed and an engine torque of the vehicle; A determination unit is used to determine that the exhaust gas recirculation system monitoring condition is met if the engine speed is within a preset speed range and the engine torque is within a preset torque range.

[0020] In some embodiments, the apparatus further comprises: A fourth acquisition unit, used to acquire the engine water temperature, vehicle speed, engine intake temperature and ambient temperature of the environment in which the vehicle is located; The opening unit is used to open 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 ambient temperature is greater than a second preset temperature.

[0021] A third aspect of an embodiment of the present application provides a computer-readable storage medium, wherein 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 as described above is implemented.

[0022] The fourth aspect of an embodiment of the present application provides a vehicle, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the exhaust gas recirculation system control method as described above when executing the computer program.

[0023] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: In an embodiment 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 by the misfire signal value, so that the number of misfires of the engine is counted according to the misfire signal value, and then the exhaust gas circulation rate of the exhaust gas recirculation system is controlled based on the number of misfires of the engine. In this way, the exhaust gas circulation rate can be flexibly controlled by the misfire signal, and the exhaust gas circulation rate of the exhaust gas recirculation system can be adjusted in time according to the combustion state of the engine, so that when the engine is burning normally, the exhaust gas circulation rate can be reduced at a larger exhaust gas circulation rate. When the engine combustion is abnormal, the exhaust gas circulation rate can be reduced in time to reduce the exhaust gas entering the engine, thereby reducing the water vapor content of 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, engine misfire failures are avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of a control system involved in an exhaust gas recirculation system control method provided by an exemplary embodiment is shown; Figure 2 A schematic flow chart of an exhaust gas recirculation system control method provided by an exemplary embodiment is shown; Figure 3 A schematic flow chart of an exhaust gas recirculation system control method provided by an exemplary embodiment is shown; Figure 4 A schematic flow chart of an exhaust gas recirculation system control method provided by an exemplary embodiment is shown; Figure 5 A schematic structural diagram of an exhaust gas recirculation system control device provided by an exemplary embodiment is shown; Figure 6 It is a schematic diagram of the structure of a vehicle provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is 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 application and are not used to limit the present application.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] In order to reduce engine fuel consumption, equipping vehicles with an exhaust gas recirculation (EGR) system is currently the preferred option. EGR can reintroduce exhaust gas generated by engine combustion into the combustion chamber to participate in combustion, reduce the oxygen concentration of the mixture in the combustion chamber by mixing with exhaust gas, and absorb the heat released by combustion, thereby achieving the purpose of reducing combustion speed and combustion temperature, and ultimately achieving the purpose of reducing nitrogen oxide (NOx) emissions and reducing fuel consumption.

[0028] In practical applications, the ratio of the amount of exhaust gas to the total amount of intake air sucked into the cylinder is expressed by the exhaust gas circulation rate (EGR rate). In some embodiments, in order to achieve a higher exhaust gas utilization rate and reduce fuel consumption, a higher EGR rate is usually selected for exhaust gas recirculation. However, since the exhaust gas contains some water vapor, the water vapor mixes with the intake air that passes through the air filter after passing through the EGR condenser, and then enters the intercooler. After entering the intercooler, condensed water will be generated due to the decrease in temperature. The condensed water condenses on the fins of the intercooler. 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, causing engine misfires and abnormal mixture.

[0029] The present application provides an exhaust gas recirculation system control method, 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 engine's misfire signal value is obtained, and the engine's combustion state is determined by the misfire signal value, so that the number of engine misfires is counted according to the misfire signal value, and then the exhaust gas circulation rate of the exhaust gas recirculation system is controlled based on the number of engine misfires. In this way, the exhaust gas circulation rate is flexibly controlled by the misfire signal, and the exhaust gas circulation rate of the exhaust gas recirculation system can be adjusted in time according to the engine's combustion state, so that when the engine is burning normally, the exhaust gas can be circulated at a larger exhaust gas circulation rate. When the engine combustion is abnormal, the exhaust gas circulation rate can be reduced in time to reduce the exhaust gas entering the engine, thereby reducing the water vapor content of 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, engine misfire failures are avoided.

[0030] See also Figure 1 , which shows a schematic diagram of a control system involved in an exhaust gas recirculation system control method provided by an exemplary embodiment. Figure 1 The control system includes a vehicle controller 10, an engine controller 20 and a driving parameter sensing system 30. The vehicle controller 10 is connected to the engine controller 20 and the driving parameter sensing system 30 respectively.

[0031] The driving parameter sensing system 30 includes a variety of sensors or other devices for obtaining different driving parameters of the vehicle. For example, the driving parameter sensing 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 sensing system 30 also includes an engine state sensor for detecting the engine speed, engine water temperature, engine intake temperature and other operating states, and sending the engine operating state to the engine controller 20.

[0032] The vehicle controller 10 is used to receive the driving parameters of the vehicle sent by the driving parameter sensing system 30, and obtain the misfire signal value on the CAN matrix, generate a control instruction based on the driving parameters and the misfire signal value, and send the control instruction to the engine controller 20. The engine controller 20 is used to control the exhaust gas circulation rate of the exhaust gas recirculation system of the engine when receiving the control instruction.

[0033] The present application is described below in conjunction with specific embodiments. Figure 2 , which shows a flow chart of an exhaust gas recirculation system control method provided by an exemplary embodiment. As an example and not a limitation, the method is applied to a vehicle, which is equipped with the above control system.

[0034] S201, 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, the vehicle obtains the engine misfire signal value, and the misfire signal value is used to indicate the combustion state of the engine.

[0035] The misfire signal value can be read by the vehicle controller using the CAN matrix. Each time the engine is ignited, a misfire signal for this ignition is generated, and the value of the misfire signal is determined by the combustion state of the engine. In some embodiments, the misfire signal value can be related to the speed operation state of the engine. The better the speed state, the less likely the engine is to misfire, and the smaller the misfire signal value; the worse the speed state, the greater the possibility of engine misfire, and the greater the misfire signal value.

[0036] In some embodiments, the user can manually start the exhaust gas recirculation system, and accordingly, when the vehicle receives the start command input by the user, the exhaust gas recirculation system is started based on the start command. In other embodiments, the vehicle can also detect the driving parameters of the vehicle and determine whether the exhaust gas recirculation system needs to be started based on the driving parameters of the vehicle. Accordingly, the vehicle obtains 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, and the vehicle speed is greater than the preset vehicle speed, and the engine intake temperature is greater than the first preset temperature, and the ambient temperature is greater than the second preset temperature, the exhaust gas recirculation system of the vehicle is started.

[0037] The preset temperature range, preset vehicle speed, first preset temperature and second preset temperature can be set as needed, and are not specifically limited in the embodiments of the present application. 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.

[0038] In this implementation, the vehicle's driving parameters are detected to detect whether to automatically turn on the exhaust gas recirculation system. When it is detected that the driving parameters meet the activation conditions of the exhaust gas recirculation system, the vehicle automatically turns on the exhaust gas recirculation system. In this way, the exhaust gas recirculation system can be turned on in time according to the vehicle's driving parameters, thereby timely achieving the needs of reducing fuel consumption and reducing NOX pollutant emissions.

[0039] After the vehicle turns on the exhaust gas recirculation system, the vehicle can directly start the strategy for controlling the exhaust gas recirculation rate, that is, after the vehicle turns on the exhaust gas recirculation system, the vehicle obtains the engine misfire signal value. The vehicle can also continue to determine whether the exhaust gas recirculation system monitoring conditions are met according to the vehicle state, that is, after the vehicle turns on the exhaust gas recirculation system, determine whether the vehicle state meets the exhaust gas recirculation system monitoring conditions, and if the exhaust gas recirculation system monitoring conditions are met, the vehicle executes the step of obtaining the engine misfire signal value.

[0040] Among them, the vehicle can determine whether the vehicle meets the exhaust gas recirculation system detection conditions based on the engine speed and engine torque. Accordingly, the vehicle obtains the engine speed and engine torque of the vehicle; if the engine speed is within the preset speed range and the engine torque is within the preset torque range, it is determined that the exhaust gas recirculation system monitoring conditions are met.

[0041] The preset speed range and the preset torque range can be set as needed. In the embodiment 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] rpm; the preset torque range can be [70-170] N, etc.

[0042] In this implementation, the control logic of the exhaust gas circulation rate is turned on only when the vehicle meets the exhaust gas recirculation system monitoring conditions. In this way, monitoring is started only when the exhaust gas recirculation system monitoring conditions are met and it is determined that misfire may occur, thereby reducing the energy consumption generated by monitoring.

[0043] S202: The vehicle counts the number of misfires of the engine according to the misfire signal value.

[0044] A suspected misfire counter may be configured in the vehicle, and the number of engine misfires may be counted based on the suspected misfire counter. For example, a preset threshold may be set, and when the misfire signal value is greater than the preset threshold, the suspected misfire counter counts up.

[0045] In some embodiments, the vehicle periodically counts the number of misfires of the engine. Accordingly, within 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 cleared to zero and the next counting cycle is started.

[0046] In some counting cycles, after the vehicle obtains the ground fire signal value, it compares the fire signal value with the preset threshold. If the fire signal value is greater than the preset threshold, the count of the suspected fire counter is increased by the target value. If the fire signal value is not greater than the preset threshold, the count of the suspected fire counter remains unchanged.

[0047] The preset threshold value can be calibrated according to the misfire signal value of the vehicle when the engine misfires. For example, the misfire signal value of the vehicle when the engine misfires is determined as the preset threshold value; or, the preset threshold value can be based on the product of the misfire signal value of the vehicle when the engine misfires and the threshold parameter. The threshold parameter can be set as needed. In the embodiment 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 embodiment of the present application, the target value can be set as needed. In the embodiment of the present application, the target value is not specifically limited. For example, the target value can be 1 or 2, etc.

[0048] Among them, the counting cycle can be set as a time cycle. For example, the vehicle uses a preset time as a counting cycle. The preset time can be set as needed. In the embodiment of the present application, the preset time is not specifically limited. The counting cycle can also be set as an engine ignition count cycle. For example, the vehicle uses a preset ignition count as a counting cycle. The preset ignition count can be set as needed. In the embodiment of the present application, the preset ignition count is not specifically limited. For example, the preset ignition count can be 2000 times, 1000 times or 500 times, etc.

[0049] S203, the vehicle controls the exhaust gas circulation rate of the exhaust gas recirculation system based on the number of misfires of the engine.

[0050] When the number of engine misfires reaches a preset value, the vehicle controls the exhaust gas recirculation rate of the exhaust gas recirculation system to decrease.

[0051] The vehicle can be set with at least one counting cycle to count the number of engine misfires. When the vehicle is set with a counting cycle, when the number of engine misfires reaches a preset number within the counting cycle, the vehicle controls the exhaust gas circulation rate to decrease. The vehicle can also be set with multiple counting cycles, with different preset values ​​and target values ​​set for different counting cycles, and the exhaust gas circulation rate of the exhaust gas recirculation system is controlled to decrease to different target values ​​under different circumstances, thereby achieving the purpose of flexibly controlling the exhaust gas circulation rate. Taking the vehicle as an example of setting two counting cycles, accordingly, if the number of engine misfires reaches a first preset value within the first counting cycle, the exhaust gas circulation rate of the exhaust gas recirculation system is controlled to decrease to a first target value; if the number of engine misfires reaches a second preset value within the second counting cycle, the exhaust gas circulation rate of the exhaust gas recirculation system is controlled to decrease to a second target value; wherein, the second counting cycle is less than the first counting cycle, and the second target value is less than the first target value.

[0052] See also Figure 3 , which shows a flowchart of a method for controlling the exhaust gas circulation rate of a vehicle in the case of two counting cycles provided by an exemplary embodiment. Figure 3 When the vehicle obtains driving parameters, it is determined whether the driving parameters meet the start-up conditions of the exhaust gas recirculation system. If so, the exhaust gas recirculation system is started, and it is determined whether it is necessary to monitor the misfire signal, and the engine speed and engine torque are obtained. If the engine speed and engine torque meet the conditions for starting the detection of the misfire signal, the misfire signal value of the vehicle is obtained. When the misfire signal value is greater than a preset threshold, the count is increased by 1, and at the same time, it is determined whether the count values ​​in the two counting cycles reach the preset values ​​corresponding to the counting cycles. If the preset values ​​corresponding to the counting cycles are reached, the exhaust gas circulation rate of the exhaust gas recirculation system of the vehicle is reduced to the corresponding target value.

[0053] Among them, the first counting period, the second counting period, the first preset value, the second preset value, the first target value and the second target value can be set as needed, and no specific limitation is made in the embodiments of the present application.

[0054] 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 circulation rate; the second counting cycle is 500, the second threshold value corresponding to the second counting cycle is 100, and the second target value is 0% of the original exhaust gas circulation rate. Accordingly, when the vehicle starts to count the number of misfires, the two counting cycles are counted independently. When the number of misfires in any counting cycle reaches the preset value corresponding to the counting cycle, the exhaust gas circulation rate of the vehicle's exhaust gas recirculation system is reduced to the corresponding target value. When a counting cycle ends and the number of misfires does not reach the corresponding preset value, the counter is technically cleared to zero, and a new technical cycle is restarted to start counting.

[0055] One point that needs to be explained is that the number of counting cycles can be set as needed. In the embodiment of the present application, the number of counting cycles is not specifically limited. The vehicle can be set with more or fewer counting cycles for fire counting. In the embodiment of the present application, the number of counting cycles is not specifically limited.

[0056] In this implementation, by setting multiple counting cycles, different preset values ​​and target values ​​are set for different counting cycles. Under different circumstances, the exhaust gas circulation rate of the exhaust gas recirculation system is controlled to drop to different target values, thereby achieving the purpose of flexibly controlling the exhaust gas circulation rate.

[0057] Another point to be explained is that after adjusting the exhaust gas circulation rate, the vehicle can continue to detect the misfire signal, and when the misfire signal is detected to return to normal, the exhaust gas circulation rate of the waste gas recirculation system is increased again. For example, the number of misfires continues to be counted within the counting cycle, and when the number of misfires within the counting cycle is less than the third preset value, the exhaust gas circulation rate of the exhaust gas recirculation system is controlled to increase to the corresponding fifth target value.

[0058] In addition, in the embodiment of the present application, the exhaust gas circulation rate can be adjusted by adjusting the opening of the intake valve of the exhaust gas recirculation system. When the waste circulation rate needs to be reduced, the valve opening can be reduced, and when the waste circulation rate needs to be increased, the valve opening can be increased.

[0059] In an embodiment 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 by the misfire signal value, so that the number of misfires of the engine is counted according to the misfire signal value, and then the exhaust gas circulation rate of the exhaust gas recirculation system is controlled based on the number of misfires of the engine. In this way, the exhaust gas circulation rate can be flexibly controlled by the misfire signal, and the exhaust gas circulation rate of the exhaust gas recirculation system can be adjusted in time according to the combustion state of the engine, so that when the engine is burning normally, the exhaust gas circulation rate can be reduced at a larger exhaust gas circulation rate. When the engine combustion is abnormal, the exhaust gas circulation rate can be reduced in time to reduce the exhaust gas entering the engine, thereby reducing the water vapor content of 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, engine misfire failures are avoided.

[0060] Since condensed water may also combine with water vapor in the air when it is generated, the humidity of the vehicle's environment also affects the generation of condensed water, which in turn affects the engine operation. Therefore, in some embodiments, the vehicle can also control the vehicle's exhaust gas recirculation system in combination with the ambient humidity parameter of the vehicle's environment. Figure 4, which shows a flow chart of an exhaust gas recirculation system control method provided by an exemplary embodiment. As an example and not a limitation, the method is applied to a vehicle.

[0061] S401, 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, the vehicle obtains the ambient humidity parameters of the environment where the vehicle is located.

[0062] The environmental humidity parameter is used to indicate the air humidity of the environment in which the vehicle is located. In some embodiments, the vehicle can obtain the environmental humidity of the environment in which the vehicle is located based on the humidity sensor. In other embodiments, the vehicle can use the duration of the operation of the vehicle's windshield wipers as the environmental humidity parameter, that is, when the vehicle is driving in the rain or when the air humidity is high, the wipers may need to be turned on continuously. Therefore, the longer the duration of the operation of the wipers is, the greater the control humidity is, and the higher the environmental humidity parameter is. Accordingly, the vehicle can obtain the duration of the operation of the wipers of the rain.

[0063] S402, the vehicle controls the exhaust gas circulation rate of the exhaust gas recirculation system according to the ambient humidity parameter.

[0064] When the ambient humidity parameter is high, the waste circulation rate of the exhaust gas recirculation system is reduced.

[0065] When the ambient humidity parameter is the operation duration of the wiper, if the operation duration reaches a first preset duration, the exhaust gas circulation rate of the exhaust gas recirculation system is controlled to drop to a third target value.

[0066] The first preset duration and the third target value can be set as needed. In the embodiment 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. The first target value can be 50% of the original exhaust gas circulation rate or 0% of the original exhaust gas circulation rate.

[0067] One point that needs to be explained is that after lowering the exhaust gas circulation rate, the vehicle can continue to detect the operating status of the wipers. When it is detected that the wipers are turned off, the vehicle can re-control the exhaust gas circulation rate to increase. In some embodiments, the duration of the vehicle's wipers being turned off is obtained; if the duration of the closure 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.

[0068] The second preset time length and the fourth target value can be set as needed. In the embodiment of the present application, the second preset time length and the fourth target value are not specifically limited. For example, the second preset time length is 20 minutes, 25 minutes or 30 minutes, etc.; the fourth target value can be the original exhaust gas circulation rate, etc.

[0069] In this implementation, when it is detected that the wiper is turned off, the vehicle determines that the current ambient humidity is low and can reopen the exhaust gas recirculation system. When it is detected that the wiper has been off for a second preset time, the exhaust gas circulation rate is controlled to increase, thereby preventing the problem of increased exhaust gas circulation rate caused by accidental touch of the wiper.

[0070] In an embodiment 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 ambient humidity parameters of the vehicle's environment are obtained, and the humidity of the vehicle's environment is determined by the ambient humidity parameters, so as to control the exhaust gas circulation rate of the exhaust gas recirculation system according to the ambient humidity. In this way, the exhaust gas circulation rate can be adjusted according to the environment in which the vehicle is located, so that when the air humidity is low, the exhaust gas circulation can be carried out at a larger 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, thereby reducing the water vapor content of 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, engine misfires are avoided.

[0071] It should be noted that the vehicle can also control the exhaust gas recirculation rate in combination with the misfire signal and the ambient humidity parameter of the environment in which the vehicle is located. For example, when the vehicle detects that the number of engine misfires reaches a preset value within a counting cycle, and / or the ambient humidity parameter meets the control condition, the exhaust gas recirculation rate is controlled to decrease.

[0072] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0073] See also Figure 5 , which shows a schematic diagram of the structure of an exhaust gas recirculation system control device provided by the present application, and the various units included are used to perform the various steps in the above embodiments, see Figure 5 , the exhaust gas recirculation system control device comprises: A first acquisition unit 501 is used to acquire a misfire signal value of the engine when the exhaust gas recirculation system of the vehicle is turned on and if the state parameter of the vehicle meets the exhaust gas recirculation system monitoring condition, the misfire signal value is used to indicate the combustion state of the engine; A statistical unit 502, used for counting the number of misfires of the engine according to the misfire signal value; The control unit 503 is used to control the exhaust gas circulation rate of the exhaust gas recirculation system based on the number of misfires of the engine.

[0074] In some embodiments, the control unit 503 is used to control the exhaust gas circulation rate of the exhaust gas recirculation system to drop to a first target value if the number of misfires of the engine reaches a first preset value within a first counting cycle; and to control the exhaust gas circulation rate of the exhaust gas recirculation system to drop to a second target value if the number of misfires of the engine reaches a second preset value within a second counting cycle; wherein the second counting cycle is smaller than the first counting cycle, and the second target value is smaller than the first target value.

[0075] In some embodiments, the apparatus further comprises: A second acquisition unit is used to acquire an environmental humidity parameter of the environment where the vehicle is located; The control unit 503 is used to control the exhaust gas circulation rate of the exhaust gas recirculation system according to the environmental humidity parameter.

[0076] In some embodiments, the environmental humidity parameter includes the continuous operation time of the wiper of the vehicle, and the second acquisition unit is used to acquire the operation time of the wiper of the vehicle; The control unit 503 is used to control the exhaust gas circulation rate of the exhaust gas recirculation system to drop to a third target value if the operation duration reaches a first preset duration.

[0077] In some embodiments, the second acquisition unit is used to acquire the duration of the vehicle's windshield wiper being turned off; The control unit 503 is used to control the exhaust gas circulation rate of the exhaust gas recirculation system to increase to a fourth target value if the shutdown duration reaches a second preset duration.

[0078] In some embodiments, the statistical unit 502 is used to increase the number of misfires of the engine by a target value if the misfire signal value obtained within a counting cycle is greater than a preset threshold; after a counting cycle ends, the number of misfires is cleared to zero and the next counting cycle is started.

[0079] In some embodiments, the apparatus further comprises: A third acquisition unit, used to acquire the engine speed and engine torque of the vehicle; The determination unit is used to determine that the exhaust gas recirculation system monitoring condition is met if the engine speed is within a preset speed range and the engine torque is within a preset torque range.

[0080] In some embodiments, the apparatus further comprises: A fourth acquisition unit is used to acquire the engine water temperature, vehicle speed, engine intake temperature and the ambient temperature of the environment in which the vehicle is located; The opening unit is used to open 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 the 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.

[0081] In an embodiment 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 by the misfire signal value, so that the number of misfires of the engine is counted according to the misfire signal value, and then the exhaust gas circulation rate of the exhaust gas recirculation system is controlled based on the number of misfires of the engine. In this way, the exhaust gas circulation rate can be flexibly controlled by the misfire signal, and the exhaust gas circulation rate of the exhaust gas recirculation system can be adjusted in time according to the combustion state of the engine, so that when the engine is burning normally, the exhaust gas circulation rate can be reduced at a larger exhaust gas circulation rate. When the engine combustion is abnormal, the exhaust gas circulation rate can be reduced in time to reduce the exhaust gas entering the engine, thereby reducing the water vapor content of 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, engine misfire failures are avoided.

[0082] Figure 6 FIG. 1 is a schematic diagram of a vehicle provided by an exemplary embodiment of the present application. Figure 6 As 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 exhaust gas recirculation system control method embodiments are implemented, such as Figure 2 Alternatively, when the processor 60 executes the computer program 62, the functions of each unit in the above-mentioned device embodiments are realized, for example Figure 5 The functions of the first acquisition unit 501, the statistical unit 502 and the control unit 503 are shown.

[0083] Exemplarily, the computer program 62 may be divided into one or more units, which are stored in the memory 61 and executed by the processor 60 to complete the present application. The one or more units may be a series of computer program instruction segments capable of completing specific functions, which are used to describe the execution process of the computer program 62 in the vehicle 6. For example, the computer program 62 may be divided into a first acquisition unit 501, a statistical unit 502, and a control unit 503, and the specific functions of each module are as follows: A first acquisition unit 501 is used to acquire a misfire signal value of the engine when the exhaust gas recirculation system of the vehicle is turned on and if the state parameter of the vehicle meets the exhaust gas recirculation system monitoring condition, the misfire signal value is used to indicate the combustion state of the engine; A statistical unit 502, used for counting the number of misfires of the engine according to the misfire signal value; The control unit 503 is used to control the exhaust gas circulation rate of the exhaust gas recirculation system based on the number of misfires of the engine.

[0084] The vehicle 6 may be any vehicle having 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 will appreciate that Figure 6 It is only an example of vehicle 6 and does not constitute a limitation of the vehicle 6. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the vehicle 6 may also include input and output devices, network access devices, buses, etc.

[0085] The processor 60 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0086] 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 include both an internal storage unit of the vehicle 6 and an external storage device. 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 is to be output.

[0087] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, 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. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0088] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0089] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0090] In the embodiments provided in the present application, it should be understood that the disclosed devices / terminal equipment and methods can be implemented in other ways. For example, the device / terminal equipment embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as 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 mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0091] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0092] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, 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 software functional units.

[0093] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can 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, computer-readable media do not include electric carrier signals and telecommunication signals.

[0094] The embodiments of the present application further provide a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0095] 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 implement the steps in the above-mentioned method embodiments when executing the computer program product.

[0096] The embodiments described above 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 aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the 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; Based on the number of misfires of the engine, an exhaust gas circulation rate of the exhaust gas recirculation system is controlled.

2. The method according to claim 1, characterized in that The controlling the exhaust gas circulation rate of the exhaust gas recirculation system based on the number of misfires of the engine comprises: 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.

3. 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.

4. The method according to claim 3, 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.

5. The method according to claim 4, 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.

6. 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.

7. 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.

8. 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.

9. 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 8 is implemented.

10. 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 8.

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