Exhaust gas recirculation system control method, electronic equipment and engine

Abstract

The invention provides an exhaust gas recirculation system control method, electronic equipment and an engine, which are applied to the technical field of vehicle intelligent control, and the method comprises the following steps: determining a target exhaust gas circulation rate based on a misfire count value in response to the change of the misfire count value of the engine in a current working period, according to the target exhaust gas circulation rate, whether an exhaust gas recirculation system meets an updating condition or not is judged; and in response to the fact that the exhaust gas recirculation system meets the updating condition, it is determined that the current work period is ended, and the target exhaust gas circulation rate is determined as the exhaust gas circulation rate of the next work period of the exhaust gas recirculation system. According to the method, it is ensured that the exhaust gas recirculation system can dynamically adapt to the operation state of the engine, the combustion stability is optimized, the fire risk is reduced, and the optimal exhaust gas circulation rate is kept in different work periods.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle intelligent control, and particularly to a control method for an exhaust gas recirculation system, an electronic device, and an engine. Background Art

[0002] Exhaust gas recirculation technology reduces the combustion temperature and nitrogen oxide emissions by reintroducing a portion of the exhaust gas from the exhaust system back into the intake system to participate in the combustion process. However, the introduction of exhaust gas recirculation system technology has also brought some problems, especially in terms of engine combustion stability. The application of the exhaust gas recirculation system causes a decrease in the oxygen concentration participating in combustion in the combustion chamber, thereby affecting combustion stability. When the environmental humidity is high, the air pressure is low, or the engine has problems such as carbon deposition or low voltage, the introduction of the exhaust gas recirculation system will further deteriorate combustion stability and increase the risk of misfire. Summary of the Invention

[0003] In view of this, the purpose of the present application is to propose a control method for an exhaust gas recirculation system, an electronic device, and an engine to reduce the risk of engine misfire.

[0004] Based on the above purpose, the present application provides a control method for an exhaust gas recirculation system, including:

[0005] In response to determining a change in the misfire count value of the engine during the current working cycle, determining a target exhaust gas recirculation rate based on the misfire count value, and determining whether the exhaust gas recirculation system meets the update condition according to the target exhaust gas recirculation rate;

[0006] In response to determining that the exhaust gas recirculation system meets the update condition, determining the end of the current working cycle, and determining the target exhaust gas recirculation rate as the exhaust gas recirculation rate for the next working cycle of the exhaust gas recirculation system.

[0007] Based on the same inventive concept, the present application also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable by the processor, wherein the processor implements the method as described above when executing the computer program.

[0008] Based on the same inventive concept, the present application also provides an engine, including a controller, and the controller is used to execute the above method.

[0009] As can be seen from the above, the exhaust gas recirculation system control method, electronic device, and engine provided by the present application, wherein the method includes: in response to determining that the misfire count value of the engine changes during the current working cycle, indicating that the combustion stability of the engine is affected, determining a target exhaust gas recirculation rate based on the misfire count value, and judging whether the exhaust gas recirculation system meets the update condition according to the target exhaust gas recirculation rate, that is, judging whether the target exhaust gas recirculation rate can optimize the combustion stability and reduce the engine misfire risk; in response to determining that the exhaust gas recirculation system meets the update condition, indicating that the current engine working condition requires adjusting the exhaust gas recirculation rate to optimize the combustion stability, determining the end of the current working cycle, and determining the target exhaust gas recirculation rate as the exhaust gas recirculation rate of the exhaust gas recirculation system in the next working cycle, ensuring that the exhaust gas recirculation system can dynamically adapt to the operating state of the engine, optimize the combustion stability, reduce the misfire risk, and maintain the best exhaust gas recirculation rate in different working cycles. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the present application or related technologies, the following will briefly introduce the drawings required for use in the embodiments or related technology descriptions. Obviously, the drawings in the following description are only embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0011] Figure 1 It is a flowchart of the exhaust gas recirculation system control method according to an embodiment of the present application;

[0012] Figure 2 It is a schematic diagram of the exhaust gas recirculation system control device according to an embodiment of the present application;

[0013] Figure 3 It is a schematic diagram of the hardware structure of an electronic device provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] To make the objectives, technical solutions, and advantages of the present application clearer, the following further details the present application in conjunction with specific embodiments and with reference to the accompanying drawings.

[0015] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the ordinary meanings understood by those of ordinary skill in the art to which the present application belongs. The "first", "second" and similar terms used in the embodiments of the present application do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0016] In the related art, with the increasing global environmental protection awareness and the strict government supervision on vehicle emissions, automobile manufacturers are facing great pressure to reduce emissions and improve fuel efficiency. To address these challenges, hybrid vehicles and electric vehicles are gradually becoming the mainstream of the market. However, the internal combustion engine remains one of the main power sources in the current automotive market. To further improve the thermal efficiency of the internal combustion engine and reduce harmful emissions, the exhaust gas recirculation system is widely used. The exhaust gas recirculation system (EGR - Exhaust Gas Recirculation) mainly includes an EGR valve, an exhaust manifold, an intake manifold, an EGR cooler, an electronic control unit (ECU), and sensors. The EGR valve is the core component of the EGR system, and its main function is to control the flow rate of exhaust gas recirculation. The EGR valve is usually installed between the exhaust manifold and the intake manifold and adjusts the opening of the valve electrically or pneumatically to control the amount of exhaust gas recirculated. The electric EGR valve is controlled by the electronic control unit through an electrical signal, with a fast response speed and high control precision. The pneumatic EGR valve controls the opening of the valve through vacuum or air pressure, with a simple structure but relatively low control precision. The exhaust manifold is a pipe that collects the exhaust gas discharged from each cylinder and guides it to the exhaust system. In the EGR system, a part of the exhaust gas in the exhaust manifold is guided to the EGR valve. The intake manifold is a pipe that distributes the air passing through the air filter and throttle valve to each cylinder. In the EGR system, the exhaust gas controlled by the EGR valve is re - introduced into the cylinder through the intake manifold, mixed with fresh air, and participates in combustion. The EGR cooler is used to cool the recirculated exhaust gas. The high - temperature exhaust gas is cooled by the EGR cooler before entering the intake manifold to reduce the exhaust gas temperature, increase the intake air density, improve the combustion efficiency, and reduce the generation of NOx. The EGR cooler is usually a water - cooled or air - cooled heat exchanger. The electronic control unit is the "brain" of the entire EGR system, responsible for monitoring and regulating the operation of the EGR system. The ECU adjusts the opening of the EGR valve in real - time according to the engine operating conditions (such as speed, load, temperature, etc.) to ensure an appropriate amount of exhaust gas recirculation. The sensors are used to detect various parameters of the engine and the EGR system and transmit the data to the ECU. For example, the oxygen sensor detects the oxygen concentration in the exhaust gas; the temperature sensor monitors the intake and exhaust gas temperatures; the pressure sensor measures the intake and exhaust gas pressures; the position sensor detects the opening position of the EGR valve. Among them, the exhaust manifold collects the exhaust gas discharged from each cylinder and guides a part of the exhaust gas to the EGR valve through the EGR pipe. The EGR valve adjusts the flow rate of the exhaust gas according to the instructions of the ECU. The electric EGR valve is controlled by an electrical signal, and the pneumatic EGR valve is controlled by vacuum or air pressure. The exhaust gas adjusted by the EGR valve enters the EGR cooler for cooling to reduce the exhaust gas temperature. The cooled exhaust gas re - enters the cylinder through the intake manifold, mixed with fresh air, and participates in combustion.The ECU monitors various parameters of the engine and the EGR system in real time through sensors, and adjusts the opening of the EGR valve according to the working conditions to ensure an appropriate amount of exhaust gas recirculation.

[0017] Exhaust gas recirculation technology reduces the combustion temperature and NOx emissions by reintroducing a portion of the exhaust gas from the exhaust system back into the intake system to participate in the combustion process. It can improve fuel efficiency over a wide range of engine operating conditions. However, the introduction of exhaust gas recirculation system technology also brings some problems, especially in terms of engine combustion stability. The application of the exhaust gas recirculation system reduces the oxygen concentration in the combustion chamber participating in combustion, thus affecting combustion stability. When the ambient humidity is high, the air pressure is low, or there are problems such as engine carbon deposition or low voltage, the introduction of the exhaust gas recirculation system will further deteriorate combustion stability and increase the risk of misfire.

[0018] By controlling the exhaust gas recirculation rate, the impact of exhaust gas recirculation on engine performance can be evaluated relatively reasonably. The exhaust gas recirculation rate is defined as the ratio of the amount of recirculated exhaust gas to the total intake air volume inhaled into the cylinder. The reasonable control of the exhaust gas recirculation rate is extremely important for the purification effect of nitrogen oxides and the overall engine emissions. The exhaust gas recirculation rate can evaluate the impact of exhaust gas recirculation on engine performance. There are usually two ways to define the exhaust gas recirculation rate: the flow method and the carbon dioxide method. The exhaust gas recirculation rate defined by the volumetric flow method is: Exhaust gas recirculation rate = V1 / (V1 + V2), where: V1 is the volume of the exhaust gas in the exhaust gas recirculation system during the intake stroke, and V2 is the volume of fresh air during the intake stroke. This method has the advantages of convenient calculation, low requirements for testing equipment, and easy implementation. There are many evaluation methods for the exhaust gas recirculation rate. The most commonly used method at home and abroad is to calculate the exhaust gas recirculation rate by measuring the carbon dioxide concentration. Since the exhaust gas is introduced into the intake pipe, the carbon dioxide concentration (volume fraction) in the intake pipe increases. The greater the carbon dioxide concentration in the intake pipe, the greater the exhaust gas recirculation rate. Since the content of CO2 in the air is very small, the change in the content of CO2 in the air is ignored during calculation. Then, the change in the CO2 concentration in the intake air can reflect the change in the amount of exhaust gas recirculation in the intake air. The exhaust gas recirculation rate defined by the carbon dioxide concentration type is: Exhaust gas recirculation rate = CO2 intake / CO2 exhaust, where CO2 intake is the volume fraction of CO2 in the intake air after the fresh air is mixed with the exhaust gas in the exhaust gas recirculation system, and CO2 exhaust is the volume fraction of CO2 in the exhaust gas. The carbon dioxide method can define the exhaust gas recirculation rate more accurately, but has higher requirements for equipment. The exhaust gas recirculation system has a great influence on the in-cylinder combustion temperature. As the exhaust gas recirculation rate increases, both the in-cylinder transient maximum temperature and the average temperature decrease accordingly. Since a high-temperature environment is a necessary condition for the formation of nitrogen oxides, an increase in the exhaust gas recirculation rate is beneficial to reducing the emissions of nitrogen oxides. A high exhaust gas recirculation rate means a decrease in the amount of fresh air, and the in-cylinder combustion will deteriorate, resulting in a decrease in the fuel economy of the diesel engine and an increase in soot emissions. As the exhaust gas recirculation rate increases, the ignition timing is continuously postponed, and the flame propagation rate slows down after ignition. As an inert gas with a relatively large specific heat value, CO2 delays ignition and slows down the combustion rate. As the exhaust gas recirculation rate increases, both the in-cylinder pressure and the maximum explosion pressure decrease significantly, the time to reach the peak pressure is postponed, the peak value of the heat release rate decreases, and the overall heat release rate curve is postponed, deteriorating the in-cylinder combustion condition.

[0019] The existing exhaust gas recirculation system technology has the following main disadvantages: The introduction of the exhaust gas recirculation system will reduce the oxygen concentration in the combustion chamber, thereby affecting combustion stability. When the engine is affected by factors such as carbon deposition and low voltage, the exhaust gas recirculation system will further deteriorate combustion stability and increase the risk of misfire. Once intermittent misfire occurs, the exhaust gas recirculation system will reintroduce the exhaust gas containing oxygen into the combustion chamber, resulting in inaccurate calculation of the fresh air intake, further inducing more serious misfire, and even causing the engine to fail to start. Under adverse environmental conditions such as high humidity and low air pressure, the introduction of the exhaust gas recirculation system will more significantly affect combustion stability and reduce the anti-interference ability of the engine.

[0020] Based on the above problems, the applicant has found that: in response to determining a change in the misfire count value of the engine during the current working cycle, determining a target exhaust gas recirculation rate based on the misfire count value, and judging whether the exhaust gas recirculation system meets the update condition according to the target exhaust gas recirculation rate; in response to determining that the exhaust gas recirculation system meets the update condition, determining the end of the current working cycle, and determining the target exhaust gas recirculation rate as the exhaust gas recirculation rate for the next working cycle of the exhaust gas recirculation system; by restricting the exhaust gas recirculation rate in advance through a misfire counter, improving the combustion stability of the engine, preventing oxygen-rich exhaust gas from entering the exhaust gas recirculation system pipeline, ensuring accurate calculation of fresh air and exhaust gas recirculation rate, enabling the exhaust gas recirculation system to dynamically adapt to the operating state of the engine, optimizing combustion stability, reducing the risk of misfire, and maintaining the optimal exhaust gas recirculation rate in different working cycles, which can not only protect the engine but also ensure fuel economy.

[0021] The following will describe the embodiments of the present application in detail with reference to the accompanying drawings.

[0022] The present application provides a method for controlling an exhaust gas recirculation system, as Figure 1 shown. In some embodiments, this method is executed by a vehicle controller or a data processor set independently of the vehicle controller. The following embodiments will take the vehicle controller as an example for illustration; the method includes:

[0023] S101. In response to determining a change in the misfire count value of the engine during the current working cycle, determining a target exhaust gas recirculation rate based on the misfire count value, and judging whether the exhaust gas recirculation system meets the update condition according to the target exhaust gas recirculation rate;

[0024] During specific implementation, the working state of the engine, including the misfire count value, is continuously monitored during engine operation. The misfire count value is calculated from the signal fluctuations of the crankshaft speed sensor. When the signal of the crankshaft speed sensor shows that the fluctuation of a certain cylinder of the engine exceeds the fluctuation threshold, the misfire count value will increase by one step (the size of one step can be set according to the needs of the vehicle control system. Exemplarily, one step can be set to 100). If the fluctuation amplitude in a continuous preset number (such as 200) of test cycles is lower than the fluctuation threshold, the current misfire count value will be recorded as the historical misfire count value, and the misfire counting will start again (the initial value is 0). When the misfire count value increases beyond the misfire counting threshold, an engine misfire fault alarm will be reported. It should be noted that usually multiple historical misfire count values can be obtained within one working cycle (exemplarily, one working cycle can be set to 300 seconds). Based on the multiple historical misfire count values, multiple historical exhaust gas recirculation rates can be determined. Therefore, when it is detected that the misfire count value changes, it indicates that the combustion stability of the engine has been affected. It may be because the exhaust gas recirculation rate of the engine in the current working cycle is inappropriate, resulting in a decrease in the oxygen concentration in the combustion chamber, thus affecting the combustion stability. When the engine is affected by factors such as carbon deposition and low voltage, the exhaust gas recirculation system will further deteriorate the combustion stability and increase the risk of misfire. Once intermittent misfire occurs, the exhaust gas recirculation system will reintroduce the oxygen-containing exhaust gas into the combustion chamber, resulting in inaccurate calculation of the fresh air intake, further inducing more serious misfire, and even causing the engine to fail to start. Under adverse environmental conditions such as high humidity and low air pressure, the exhaust gas recirculation system will also more significantly affect the combustion stability and reduce the anti-interference ability of the engine. At this time, the misfire count value is compared with the misfire diagnosis threshold to calculate the misfire diagnosis value. According to the misfire diagnosis value, the target exhaust gas recirculation rate is determined, and it is judged whether the exhaust gas recirculation system meets the update condition based on the target exhaust gas recirculation rate, the exhaust gas recirculation rate of the current working cycle, and the historical minimum exhaust gas recirculation rate within the current working cycle, so as to update the exhaust gas recirculation rate of the engine in the current working cycle and ensure the combustion stability and reliability of the engine under various working conditions.

[0025] S102. In response to determining that the exhaust gas recirculation system meets the update condition, determine the end of the current working cycle, and determine the target exhaust gas recirculation rate as the exhaust gas recirculation rate of the exhaust gas recirculation system in the next working cycle.

[0026] In specific implementation, when it is determined that the exhaust gas recirculation system meets the update condition, it indicates that the current engine operating condition requires adjustment of the exhaust gas recirculation rate to optimize combustion stability and reduce the risk of misfire. Mark the current working cycle as ended. The working cycle can be determined based on the engine running time, the engine running mileage, or specific events (such as engine start or stop). The steps to end the current working cycle generally include: recording all relevant data within the current working cycle, including misfire count values, exhaust gas recirculation rates, engine operating parameters, etc. The misfire counter and timer need to be cleared or reset to start monitoring and calculating again in the new working cycle. After the end of the current working cycle, determine the target exhaust gas recirculation rate as the exhaust gas recirculation rate for the next working cycle of the exhaust gas recirculation system. At the start of the new working cycle, use the target exhaust gas recirculation rate as the initial condition to ensure that the engine can operate at an optimized exhaust gas recirculation rate within the new working cycle. Within the new working cycle, continue to monitor the engine operating state, including parameters such as misfire count values and combustion stability. If a change in the misfire count value is detected again, repeat the above process to dynamically adjust the exhaust gas recirculation rate.

[0027] In this embodiment, by ending the current working cycle after determining that the exhaust gas recirculation system meets the update condition and setting the target exhaust gas recirculation rate as the exhaust gas recirculation rate for the next working cycle, it is ensured that the exhaust gas recirculation system can dynamically adapt to the engine operating state. Since the exhaust gas recirculation system reintroduces part of the exhaust gas from the exhaust system into the intake system to participate in the combustion process, it reduces the combustion temperature and nitrogen oxide emissions. However, it will cause a decrease in the oxygen concentration participating in combustion in the combustion chamber, thus affecting combustion stability. When the environmental humidity is high, the air pressure is low, or there are problems such as engine carbon deposition or low voltage, the introduction of the exhaust gas recirculation system will further deteriorate combustion stability and increase the risk of misfire. Therefore, setting the target exhaust gas recirculation rate as the exhaust gas recirculation rate for the next working cycle can optimize combustion stability, reduce the risk of misfire, and maintain the best exhaust gas recirculation rate within different working cycles.

[0028] In some embodiments, determining whether the exhaust gas recirculation system meets the update condition according to the target exhaust gas recirculation rate includes:

[0029] In response to determining that the target exhaust gas recirculation rate is less than the exhaust gas recirculation rate of the current working cycle, determine that the exhaust gas recirculation system meets the update condition;

[0030] In specific implementation, first, determine a misfire diagnosis value according to the misfire count value and the misfire count threshold. For example, determine the ratio of the misfire count value to the misfire count threshold as the misfire diagnosis value; alternatively, determine the difference between the misfire count value and the misfire count threshold, and determine the ratio of the difference to the misfire count threshold as the misfire diagnosis value. Then, obtain the relationship data between the misfire diagnosis value and the limit coefficient of the standard exhaust gas recirculation rate, and determine the limit coefficient corresponding to the misfire diagnosis value based on the relationship data; determine the product of the limit coefficient and the standard exhaust gas recirculation rate as the target exhaust gas recirculation rate. Read the actually applied exhaust gas recirculation rate in the current working cycle. If the target exhaust gas recirculation rate is less than the exhaust gas recirculation rate of the current working cycle, it indicates that the current exhaust gas recirculation rate is too high, which will reduce the oxygen concentration in the combustion chamber, thereby affecting combustion stability. If the engine is affected by factors such as carbon deposition and low voltage, the exhaust gas recirculation system will further deteriorate combustion stability and increase the risk of misfire. Once intermittent misfire occurs, the exhaust gas recirculation system will reintroduce the exhaust gas containing oxygen into the combustion chamber, resulting in inaccurate calculation of the fresh air intake, further inducing more serious misfire, and even causing the engine to fail to start. Therefore, the exhaust gas recirculation system needs to be updated to reduce the exhaust gas recirculation rate, thereby improving combustion stability. Therefore, it is determined that the exhaust gas recirculation system meets the update conditions.

[0031] In response to determining that the target exhaust gas recirculation rate is greater than or equal to the exhaust gas recirculation rate of the current working cycle, determine whether the exhaust gas recirculation system meets the update conditions according to the target exhaust gas recirculation rate and the historical minimum exhaust gas recirculation rate in the current working cycle.

[0032] In specific implementation, if the target exhaust gas recirculation rate is greater than or equal to the exhaust gas recirculation rate of the current working cycle, it indicates that the current exhaust gas recirculation rate may be too low or already close to the optimal value. It is necessary to further check the historical minimum exhaust gas recirculation rate in the current working cycle. The historical minimum exhaust gas recirculation rate is the lowest exhaust gas recirculation rate that the exhaust gas recirculation system has ever applied in the current working cycle. Determine whether to update the historical minimum exhaust gas recirculation rate according to the target exhaust gas recirculation rate and the historical minimum exhaust gas recirculation rate in the current working cycle. If the target exhaust gas recirculation rate is less than the historical minimum exhaust gas recirculation rate, and the duration of updating the historical minimum exhaust gas recirculation rate to the target exhaust gas recirculation rate exceeds the preset duration, then the exhaust gas recirculation system meets the update conditions. If the target exhaust gas recirculation rate is greater than or equal to the historical minimum exhaust gas recirculation rate, and it is determined not to update the historical minimum exhaust gas recirculation rate to the target exhaust gas recirculation rate, then the exhaust gas recirculation system does not meet the update conditions, and continue to detect the misfire count value.

[0033] In this embodiment, determining whether the exhaust gas recirculation system meets the update condition according to the target exhaust gas recirculation rate ensures that the exhaust gas recirculation system can be dynamically adjusted to optimize the combustion stability of the engine and reduce the risk of misfire. By comparing the target exhaust gas recirculation rate with the current and historical minimum exhaust gas recirculation rates, it is possible to intelligently decide whether to update the exhaust gas recirculation rate to adapt to different engine operating conditions and running conditions.

[0034] In some embodiments, the determining whether the exhaust gas recirculation system meets the update condition according to the target exhaust gas recirculation rate and the historical minimum exhaust gas recirculation rate within the current working cycle includes:

[0035] In response to determining that the target exhaust gas recirculation rate is less than the historical minimum exhaust gas recirculation rate and the duration is greater than or equal to a preset duration, it is determined that the exhaust gas recirculation system meets the update condition.

[0036] Specifically, when the calculated target exhaust gas recirculation rate is less than the lowest exhaust gas recirculation rate (i.e., the historical minimum exhaust gas recirculation rate) applied during the current working cycle, it indicates that the exhaust gas recirculation rate needs to be further reduced to optimize combustion stability. At this time, the historical minimum exhaust gas recirculation rate is assigned the value of the target exhaust gas recirculation rate, and it is also necessary to determine whether the duration is greater than or equal to the preset duration (the preset duration can be set according to the specific operating conditions and design requirements of the engine, such as several seconds or minutes. Exemplarily, the preset duration can be set to 300 seconds). If the duration is greater than or equal to the preset duration, it indicates that the target exhaust gas recirculation rate meets the current requirements of the exhaust gas recirculation system. It is determined that the exhaust gas recirculation system meets the update condition, the current working cycle is ended, and the target exhaust gas recirculation rate is determined as the exhaust gas recirculation rate for the next working cycle of the exhaust gas recirculation system to improve combustion stability, reduce the risk of misfire, and ensure that the engine can operate at the optimal exhaust gas recirculation rate under the new operating conditions.

[0037] In this embodiment, determining whether the exhaust gas recirculation system meets the update condition according to the target exhaust gas recirculation rate and the historical minimum exhaust gas recirculation rate within the current working cycle, by considering the relationship between the target exhaust gas recirculation rate and the historical minimum exhaust gas recirculation rate and the judgment of the duration, ensures that the exhaust gas recirculation system can be adjusted more intelligently to adapt to different engine operating conditions and running conditions. Since the exhaust gas recirculation system reduces the combustion temperature and nitrogen oxide emissions by reintroducing part of the exhaust gas from the exhaust system back into the intake system to participate in the combustion process, but it will cause a decrease in the oxygen concentration participating in the combustion in the combustion chamber, thereby affecting combustion stability. Therefore, when it is determined that the target exhaust gas recirculation rate is less than the historical minimum exhaust gas recirculation rate and the duration is greater than or equal to the preset duration, it is determined that the exhaust gas recirculation system meets the update condition, and setting the target exhaust gas recirculation rate as the exhaust gas recirculation rate for the next working cycle can optimize combustion stability and reduce the risk of misfire.

[0038] In some embodiments, determining whether the exhaust gas recirculation system meets the update condition according to the target exhaust gas recirculation rate and the historical minimum exhaust gas recirculation rate within the current working cycle includes:

[0039] In response to determining that the target exhaust gas recirculation rate is greater than or equal to the historical minimum exhaust gas recirculation rate, determining that the exhaust gas recirculation system does not meet the update condition; or,

[0040] In response to determining that the target exhaust gas recirculation rate is less than the historical minimum exhaust gas recirculation rate and the duration is less than a preset duration, determining that the exhaust gas recirculation system does not meet the update condition.

[0041] In specific implementation, when the calculated target exhaust gas recirculation rate is greater than or equal to the lowest exhaust gas recirculation rate (i.e., the historical minimum exhaust gas recirculation rate) applied during the current working cycle, it indicates that the target exhaust gas recirculation rate fluctuates, and it is determined that the exhaust gas recirculation system does not meet the update condition. When the calculated target exhaust gas recirculation rate is less than the lowest exhaust gas recirculation rate (i.e., the historical minimum exhaust gas recirculation rate) applied during the current working cycle, it indicates that the exhaust gas recirculation rate needs to be further reduced to optimize combustion stability. At this time, the historical minimum exhaust gas recirculation rate is assigned the value of the target exhaust gas recirculation rate, and it is also necessary to determine whether the duration lasts for a preset duration. If the duration is less than the preset duration, it indicates that the target exhaust gas recirculation rate is unstable, the target exhaust gas recirculation rate does not meet the current requirements of the exhaust gas recirculation system, and it is determined that the exhaust gas recirculation system does not meet the update condition.

[0042] In this embodiment, determining whether the exhaust gas recirculation system meets the update condition according to the target exhaust gas recirculation rate and the historical minimum exhaust gas recirculation rate within the current working cycle, by considering the relationship between the target exhaust gas recirculation rate and the historical minimum exhaust gas recirculation rate and the judgment of the duration, ensures that the exhaust gas recirculation system can intelligently decide whether to update, and avoids the combustion stability and performance of the engine being affected by inaccurate updates. In this way, the best exhaust gas recirculation rate can be maintained under different working conditions, ensuring the efficient and stable operation of the engine.

[0043] In some embodiments, the method further includes:

[0044] In response to determining that the exhaust gas recirculation system does not meet the update condition, continuously detecting the misfire count value of the engine during the current working cycle;

[0045] During specific implementation, the misfire count value is a value that reflects the engine misfire frequency and is obtained by monitoring the fluctuation of the crankshaft speed signal. When the misfire count value increases, it indicates a decrease in combustion stability. Even if it is determined that the exhaust gas recirculation rate does not need to be updated currently, it is still necessary to continuously monitor the misfire count value within the current working cycle to ensure timely response to any new misfire situation. If the misfire count value changes within the current working cycle, it is possible to re-evaluate whether the exhaust gas recirculation rate needs to be updated to ensure flexible adjustment during actual operation and optimize combustion stability.

[0046] In response to determining the end of the current working cycle and no update being made to the exhaust gas recirculation rate of the exhaust gas recirculation system, the exhaust gas recirculation rate is determined as the exhaust gas recirculation rate for the next working cycle of the exhaust gas recirculation system.

[0047] During specific implementation, when the current working cycle ends, it is necessary to summarize and record the operating state during the current cycle, mark the current working cycle as ended, and prepare to enter the next working cycle. If it is determined during the current working cycle that the exhaust gas recirculation rate does not need to be updated, then the current exhaust gas recirculation rate remains unchanged, and the exhaust gas recirculation rate actually applied during the current working cycle is recorded as the initial exhaust gas recirculation rate for the next working cycle.

[0048] In this embodiment, when it is determined that the exhaust gas recirculation system does not meet the update conditions, the misfire count value of the engine is continuously detected within the current working cycle, and the unupdated exhaust gas recirculation rate is determined as the exhaust gas recirculation rate for the next working cycle at the end of the working cycle. This ensures that the exhaust gas recirculation system can maintain the optimal exhaust gas recirculation rate in different working cycles, optimizing the combustion stability and performance of the engine. Through continuous monitoring and dynamic response, the exhaust gas recirculation rate can be flexibly adjusted to adapt to different operating conditions and working conditions, ensuring the efficient and stable operation of the engine.

[0049] In some embodiments, determining the target exhaust gas recirculation rate based on the misfire count value includes:

[0050] Determining a misfire diagnosis value according to the misfire count value and a misfire count threshold;

[0051] During specific implementation, the misfire count value can be measured based on the signal of the crankshaft position sensor. The crankshaft position sensor (CKP or CPS) is used to collect the crankshaft rotation angle and engine speed signals and input them into the ECU. The ECU monitors the magnitude of the crankshaft angle fluctuation based on the signal of the crankshaft position sensor to determine whether there is a misfire in the engine. When a misfire occurs in the engine, since the cylinder does not perform normal work, it will cause the crankshaft speed to decrease, thereby increasing the fluctuation of the crankshaft angle. The ECU determines the misfire count value by detecting this fluctuation. The working principle and installation position of the crankshaft position sensor will affect the accuracy of its signal. Common crankshaft position sensors include magnetic induction type, Hall type, and photoelectric type, etc. The magnetic induction type crankshaft position sensor generates an induced electromotive force signal by detecting the teeth of the signal rotor on the crankshaft. The Hall type crankshaft position sensor generates a square wave signal through the Hall effect. The photoelectric type crankshaft position sensor generates a pulse signal using the photoelectric effect. The accuracy of these signals will be affected by factors such as the installation position of the sensor, the distance from the signal wheel, and whether the installation is secure. The misfire count value can also be determined based on the query of the engine speed and intake load. By using the current engine speed and intake load to query the misfire self-learning value mapping table, the preset concentration misfire self-learning value is obtained, and the target misfire self-learning value is calculated in combination with the current misfire self-learning value, and then the misfire signal is corrected. The misfire self-learning value can be dynamically adjusted according to the real-time operating conditions of the engine to improve the accuracy of misfire detection. The misfire count value can also be determined based on the oxygen sensor signal. The oxygen sensor is installed between the exhaust manifold and the three-way catalyst and measures the data of the oxygen content in the exhaust before detection in the exhaust gas, so as to judge whether the air-fuel mixture is too rich or too lean. The change in the oxygen sensor data can reflect the existence of engine faults through the fuel correction coefficient, and then the misfire count is determined. When a misfire occurs in the engine, it will cause incomplete combustion of the air-fuel mixture, thereby affecting the oxygen content in the exhaust. The oxygen sensor can detect this change and perform fault diagnosis through the ECU. The misfire count value can also be determined based on the detection of the cylinder pressure signal. During the cyclic combustion process of the engine, the pressure in the combustion chamber is an important indicator for diagnosing misfires. By measuring the pressure change in the cylinder, it can be judged whether there is a misfire. The exhaust pressure of the unignited cylinder is three times lower than the normal value, which can be used as a standard for diagnosing engine damage. When the engine is working normally, the pressure in the cylinder will show a certain change law with the combustion process. When a misfire occurs, the pressure change in the cylinder will be significantly different from the normal situation. The pressure sensor installed in the cylinder can monitor the cylinder pressure in real time and convert it into an electrical signal for the ECU to analyze and judge. The misfire count value can also be determined based on the crankshaft speed, position, and torque signals. Signals such as the angular velocity of the crankshaft, the instantaneous angular acceleration of the crankcase, and the crankshaft angle can all be used to determine whether the engine is misfiring.The instantaneous angular acceleration of the crankcase is more accurate in confirming engine damage. The ignition order in the cylinder is regular, and the reverse speed can obtain irregular energy and angular acceleration. After an engine failure, the peak value shown by the angular acceleration of the crankcase can be used to diagnose and identify faults. When an engine misfires, since the cylinder does not do work normally, it will cause changes in the angular velocity and torque of the crankshaft. By analyzing the changes in these signals, it can be determined whether the engine misfires. The misfire diagnosis value can be obtained by calculating the ratio of the misfire count value to the misfire count threshold (exemplarily, the misfire count threshold can be set to 10), and the ratio reflects the severity of the current misfire situation.

[0052] Obtain the relationship data between the misfire diagnosis value and the limit coefficient of the standard exhaust gas recirculation rate, and determine the limit coefficient corresponding to the misfire diagnosis value based on the relationship data;

[0053] Specifically in implementation, the relationship data reflects the limit coefficients that the standard exhaust gas recirculation rate needs to apply under different misfire diagnosis values. According to the currently calculated misfire diagnosis value, look up the relationship data to determine the corresponding limit coefficient. The limit coefficient is a proportional value used to adjust the standard exhaust gas recirculation rate to ensure that under the current misfire situation, the exhaust gas recirculation rate can optimize combustion stability.

[0054] Determine the product of the limit coefficient and the standard exhaust gas recirculation rate as the target exhaust gas recirculation rate.

[0055] Specifically in implementation, the standard exhaust gas recirculation rate is the optimal exhaust gas recirculation rate that the engine should adopt under normal operating conditions, usually determined through engine calibration and testing. Multiply the determined limit coefficient by the standard exhaust gas recirculation rate to obtain the target exhaust gas recirculation rate. The target exhaust gas recirculation rate is the optimal exhaust gas recirculation rate that optimizes combustion stability and engine performance under the current misfire situation. Applying the calculated target exhaust gas recirculation rate to the next working cycle can ensure that the engine can operate at the best exhaust gas recirculation rate under the new operating conditions.

[0056] In this embodiment, the process of determining the target exhaust gas recirculation rate based on the misfire count value can dynamically adjust the exhaust gas recirculation rate by calculating the misfire diagnosis value and using the limit coefficient related to the standard exhaust gas recirculation rate to adapt to different engine operating conditions and running conditions, thereby optimizing combustion stability and reducing the risk of misfires. It ensures that the exhaust gas recirculation system can intelligently respond to the real-time state of the engine, provide the best exhaust gas recirculation rate, and ensure the efficient and stable operation of the engine.

[0057] In some embodiments, the determining the misfire diagnosis value according to the misfire count value and the misfire count threshold includes:

[0058] Determine the ratio of the misfire count value to the misfire count threshold as the misfire diagnosis value; or,

[0059] Determine the difference between the misfire count value and the misfire count threshold, and determine the ratio of the difference to the misfire count threshold as the misfire diagnosis value.

[0060] In specific implementation, calculate the ratio of the current misfire count value to the misfire count threshold, that is: misfire diagnosis value = misfire count value / misfire count threshold, and the misfire diagnosis value reflects the severity of the current misfire situation. It is also possible to determine the difference between the misfire count value and the misfire count threshold, and determine the ratio of the difference to the misfire count threshold as the misfire diagnosis value. First, calculate the difference between the current misfire count value and the misfire count threshold. That is: difference = misfire count value - misfire count threshold, and then calculate the ratio of the difference to the misfire count threshold. That is: misfire diagnosis value = (misfire count value - misfire count threshold) / misfire count threshold. The ratio method is simple to calculate and directly reflects the proportional relationship of the misfire count value relative to the misfire count threshold, and is suitable for scenarios where it is necessary to quickly judge the misfire situation. The difference method provides a more detailed quantification of the misfire situation and can reflect the specific degree of the misfire situation, and is suitable for scenarios where it is necessary to detail the severity of the misfire situation.

[0061] In this embodiment, determining the misfire diagnosis value according to the misfire count value and the misfire count threshold can flexibly judge the severity of the current misfire situation, and accordingly adjust the exhaust gas recirculation rate to optimize the combustion stability and performance of the engine. It ensures that the exhaust gas recirculation system can intelligently respond to the real-time state of the engine, provide the optimal exhaust gas recirculation rate, and ensure the efficient and stable operation of the engine.

[0062] In some embodiments, the method further includes:

[0063] In response to determining that the misfire count value of the engine changes during the current working cycle and the misfire count value is greater than or equal to the misfire count threshold, turn off the exhaust gas recirculation system and give an engine misfire fault alarm.

[0064] In specific implementation, when the misfire count value is greater than or equal to the misfire count threshold, it indicates that the misfire situation has exceeded the allowable range, and immediate measures need to be taken to protect the engine. To prevent further misfires and possible engine damage, immediately turn off the exhaust gas recirculation system. Turning off the exhaust gas recirculation system can reduce the amount of exhaust gas entering the combustion chamber, thereby increasing the oxygen concentration in the combustion chamber and improving the combustion conditions. At the same time, trigger an engine misfire fault alarm, which can be achieved in various ways, such as a warning light on the dashboard, a sound alarm, or sending a fault code through the on-board diagnostic system. The purpose of the fault alarm is to promptly notify the driver or vehicle owner that there is a serious misfire problem with the engine and immediate inspection and repair are required. The system will record relevant information about the misfire fault, including the misfire count value, the time and working conditions when the misfire occurs, etc., for the maintenance personnel to diagnose and repair.

[0065] In this embodiment, when it is determined that the misfire count value of the engine changes and is greater than or equal to the misfire count threshold within the current working cycle, the exhaust gas recirculation system is closed and an engine misfire fault alarm is issued, ensuring that when the misfire situation is serious, protective measures can be taken in a timely manner to prevent further engine damage, and the driver or vehicle owner is notified of the fault through the alarm for inspection and repair. In this way, the exhaust gas recirculation system can maintain the best operating state under different working conditions, ensuring the efficient and stable operation of the engine.

[0066] Based on the above embodiment, it can be understood that assuming that during the operation of an automotive engine, its misfire count threshold is set to 20,000. Within the current working cycle, as the driving conditions change, the misfire count value of the engine is 16,000. Calculate the misfire diagnosis value: Misfire diagnosis value = Misfire count value / Misfire count threshold = 16,000 / 20,000 = 0.8 (i.e., 80%). According to the relationship between the misfire diagnosis value and the limit coefficient, when the misfire diagnosis value is 80%, the corresponding limit coefficient is 50%. Assuming that the standard exhaust gas recirculation rate is 20%, the target exhaust gas recirculation rate = Limit coefficient × Standard exhaust gas recirculation rate = 50% × 20% = 10%. Read the actually applied exhaust gas recirculation rate within the current working cycle as 15%. Since the target exhaust gas recirculation rate of 10% is less than the exhaust gas recirculation rate of 15% in the current working cycle, it indicates that the current exhaust gas recirculation rate is too high, which may lead to unstable combustion or an increased risk of misfire. Therefore, if the exhaust gas recirculation system meets the update condition, it is determined that the current working cycle ends, and the target exhaust gas recirculation rate is determined as the exhaust gas recirculation rate for the next working cycle of the exhaust gas recirculation system.

[0067] Assume that in a certain working cycle, the target exhaust gas recirculation rate is calculated to be 12%, the exhaust gas recirculation rate in the current working cycle is 10%, and the historical minimum exhaust gas recirculation rate is 13%. The target exhaust gas recirculation rate of 12% is greater than the exhaust gas recirculation rate of 10% in the current working cycle, and the historical minimum exhaust gas recirculation rate needs to be further checked. The target exhaust gas recirculation rate of 12% is less than the historical minimum exhaust gas recirculation rate of 13%, then the historical minimum exhaust gas recirculation rate is assigned 12%, and if the duration exceeds the preset time (such as 300 seconds), the exhaust gas recirculation system meets the update condition; then it is determined that the current working cycle ends, and the target exhaust gas recirculation rate is determined as the exhaust gas recirculation rate for the next working cycle of the exhaust gas recirculation system.

[0068] Suppose that in a certain working cycle, the target exhaust gas recirculation rate is calculated to be 12%, the exhaust gas recirculation rate in the current working cycle is 10%, and the historical minimum exhaust gas recirculation rate is 13%. Since the target exhaust gas recirculation rate of 12% is greater than the exhaust gas recirculation rate of 10% in the current working cycle, it is necessary to further check the historical minimum exhaust gas recirculation rate. As the target exhaust gas recirculation rate of 12% is less than the historical minimum exhaust gas recirculation rate of 13%, the historical minimum exhaust gas recirculation rate is assigned 12%. However, if the duration does not exceed the preset duration (such as 300 seconds), for example, the target exhaust gas recirculation rate changes at the 100th second, the exhaust gas recirculation system does not meet the update condition, and the misfire count value of the engine is continuously detected in the current working cycle; if the current working cycle ends and the exhaust gas recirculation rate of the exhaust gas recirculation system is not updated, the exhaust gas recirculation rate is determined as the exhaust gas recirculation rate for the next working cycle of the exhaust gas recirculation system.

[0069] Suppose that in a certain working cycle, the target exhaust gas recirculation rate is calculated to be 12%, the exhaust gas recirculation rate in the current working cycle is 10%, and the historical minimum exhaust gas recirculation rate is 11%. Since the target exhaust gas recirculation rate of 12% is greater than the exhaust gas recirculation rate of 10% in the current working cycle, it is necessary to further check the historical minimum exhaust gas recirculation rate. As the target exhaust gas recirculation rate of 12% is greater than the historical minimum exhaust gas recirculation rate of 11%, the exhaust gas recirculation system does not meet the update condition, and the misfire count value of the engine is continuously detected in the current working cycle; if the current working cycle ends and the exhaust gas recirculation rate of the exhaust gas recirculation system is not updated, the exhaust gas recirculation rate is determined as the exhaust gas recirculation rate for the next working cycle of the exhaust gas recirculation system.

[0070] Suppose that in a certain working cycle, the misfire count value of the engine is 21000, which is greater than the misfire count threshold of 20000, then the exhaust gas recirculation system is closed and an engine misfire fault alarm is given.

[0071] It should be noted that the method of the embodiment of the present application can be executed by a single device, such as a computer or a server, etc. The method of this embodiment can also be applied to a distributed scenario and completed by multiple devices cooperating with each other. In such a distributed scenario, one of the multiple devices can only execute one or more steps of the method of the embodiment of the present application, and these multiple devices will interact with each other to complete the described method.

[0072] It should be noted that some embodiments of the present application are described above. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the above embodiments and still achieve the desired result. Additionally, the processes depicted in the figures do not necessarily require the particular order or sequential order shown to achieve the desired result. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0073] Based on the same inventive concept, corresponding to the method of any of the above embodiments, the present application further provides a control device for an exhaust gas recirculation system.

[0074] Referring to Figure 2 , the control device for the exhaust gas recirculation system includes:

[0075] A judgment module 701, which is configured to respond to determining a change in the misfire count value of the engine during the current working cycle, determine a target exhaust gas recirculation rate based on the misfire count value, and judge whether the exhaust gas recirculation system meets the update condition according to the target exhaust gas recirculation rate;

[0076] An update module 702, which is configured to respond to determining that the exhaust gas recirculation system meets the update condition, determine the end of the current working cycle, and determine the target exhaust gas recirculation rate as the exhaust gas recirculation rate for the next working cycle of the exhaust gas recirculation system.

[0077] Further, the judgment module 701 is specifically configured to:

[0078] Respond to determining that the target exhaust gas recirculation rate is less than the exhaust gas recirculation rate of the current working cycle, and determine that the exhaust gas recirculation system meets the update condition;

[0079] Respond to determining that the target exhaust gas recirculation rate is greater than or equal to the exhaust gas recirculation rate of the current working cycle, and judge whether the exhaust gas recirculation system meets the update condition according to the target exhaust gas recirculation rate and the historical minimum exhaust gas recirculation rate during the current working cycle.

[0080] Further, the judgment module 701 is specifically further configured to:

[0081] Respond to determining that the target exhaust gas recirculation rate is less than the historical minimum exhaust gas recirculation rate and the duration is greater than or equal to a preset duration, and determine that the exhaust gas recirculation system meets the update condition.

[0082] Further, the judgment module 701 is specifically further configured to:

[0083] Respond to determining that the target exhaust gas recirculation rate is greater than or equal to the historical minimum exhaust gas recirculation rate, and determine that the exhaust gas recirculation system does not meet the update condition; or,

[0084] Respond to determining that the target exhaust gas recirculation rate is less than the historical minimum exhaust gas recirculation rate and the duration is less than the preset duration, and determine that the exhaust gas recirculation system does not meet the update condition.

[0085] Further, the judgment module 701 is specifically further configured to:

[0086] In response to determining that the exhaust gas recirculation system does not meet the update condition, continuously detect the misfire count value of the engine during the current working cycle;

[0087] In response to determining the end of the current working cycle and that the exhaust gas recirculation rate of the exhaust gas recirculation system has not been updated, determine the exhaust gas recirculation rate as the exhaust gas recirculation rate of the exhaust gas recirculation system for the next working cycle.

[0088] Further, the determination module 701 is specifically further configured to:

[0089] Determine a misfire diagnosis value according to the misfire count value and the misfire count threshold;

[0090] Obtain relationship data between the misfire diagnosis value and the limit coefficient of the standard exhaust gas recirculation rate, and determine the limit coefficient corresponding to the misfire diagnosis value based on the relationship data;

[0091] Determine the product of the limit coefficient and the standard exhaust gas recirculation rate as the target exhaust gas recirculation rate.

[0092] Further, the determination module 701 is specifically further configured to:

[0093] Determine the ratio of the misfire count value to the misfire count threshold as the misfire diagnosis value; or,

[0094] Determine the difference between the misfire count value and the misfire count threshold, and determine the ratio of the difference to the misfire count threshold as the misfire diagnosis value.

[0095] Further, the determination module 701 is specifically further configured to:

[0096] In response to determining a change in the misfire count value of the engine during the current working cycle and that the misfire count value is greater than or equal to the misfire count threshold, turn off the exhaust gas recirculation system and give an engine misfire fault alarm.

[0097] For the convenience of description, when describing the above device, it is divided into various modules according to functions for separate description. Of course, when implementing the present application, the functions of each module can be implemented in the same or multiple software and / or hardware.

[0098] The device in the above embodiment is used to implement the corresponding exhaust gas recirculation system control method in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiments, which will not be elaborated here.

[0099] Based on the same inventive concept, corresponding to the method in any of the above embodiments, the present application further provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor implements the exhaust gas recirculation system control method described in any of the above embodiments when executing the program.

[0100] Figure 3 FIG. 2 shows a more specific schematic diagram of the hardware structure of the electronic device provided in this embodiment. The device may include: a processor 1010, a memory 1020, an input / output interface 1030, a communication interface 1040, and a bus 1050. Among them, the processor 1010, the memory 1020, the input / output interface 1030, and the communication interface 1040 are communicatively connected to each other inside the device through the bus 1050.

[0101] The processor 1010 may be implemented by using a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, etc., and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this specification.

[0102] The memory 1020 may be implemented in the form of a ROM (Read Only Memory), a RAM (Random Access Memory), a static storage device, a dynamic storage device, etc. The memory 1020 may store an operating system and other application programs. When implementing the technical solutions provided in the embodiments of this specification through software or firmware, the relevant program codes are stored in the memory 1020 and are called and executed by the processor 1010.

[0103] The input / output interface 1030 is used to connect to an input / output module to implement information input and output. The input / output module may be configured as a component in the device (not shown in the figure) or externally connected to the device to provide corresponding functions. Among them, the input device may include a keyboard, a mouse, a touch screen, a microphone, various sensors, etc., and the output device may include a display, a speaker, a vibrator, an indicator light, etc.

[0104] The communication interface 1040 is used to connect to a communication module (not shown in the figure) to implement communication interaction between this device and other devices. Among them, the communication module may implement communication in a wired manner (such as USB, network cable, etc.) or in a wireless manner (such as mobile network, WIFI, Bluetooth, etc.).

[0105] The bus 1050 includes a path for transmitting information between various components of the device (such as the processor 1010, the memory 1020, the input / output interface 1030, and the communication interface 1040).

[0106] It should be noted that although the above device only shows the processor 1010, the memory 1020, the input / output interface 1030, the communication interface 1040, and the bus 1050, in the specific implementation process, the device may further include other components necessary for normal operation. In addition, those skilled in the art can understand that the above device may also only include the components necessary to implement the solution of the embodiments of this specification, and does not necessarily include all the components shown in the figure.

[0107] The electronic device in the above embodiment is used to implement the corresponding exhaust gas recirculation system control method in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiments, which will not be elaborated here.

[0108] Based on the same inventive concept, corresponding to the method in any of the above embodiments, the present application further provides an engine, including a controller, and the controller is used to execute the exhaust gas recirculation system control method described in any of the above embodiments.

[0109] The engine in the above embodiment is used to implement the corresponding exhaust gas recirculation system control method in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiments, which will not be elaborated here.

[0110] Based on the same inventive concept, corresponding to the method in any of the above embodiments, the present application further provides a non-transitory computer-readable storage medium, and the non-transitory computer-readable storage medium stores computer instructions, and the computer instructions are used to make the computer execute the exhaust gas recirculation system control method described in any of the above embodiments.

[0111] The computer-readable medium in this embodiment includes permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette tapes, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device.

[0112] The computer instructions stored in the storage medium in the above embodiment are used to make the computer execute the exhaust gas recirculation system control method described in any of the above embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be elaborated here.

[0113] Based on the same inventive concept, corresponding to any of the above-described method embodiments, the present application further provides a computer program product, including computer program instructions, which, when running on a computer, cause the computer to execute the method described in any of the above embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be elaborated herein.

[0114] It can be understood that before using the technical solutions of the various embodiments in the present disclosure, the types, usage scopes, usage scenarios, etc. of the personal information involved will be informed to the user in an appropriate manner, and the user's authorization will be obtained.

[0115] For example, when a user's active request is received, a prompt message is sent to the user to clearly prompt the user that the operation requested by the user will require obtaining and using the user's personal information. Thus, the user can autonomously choose whether to provide personal information to software or hardware such as an electronic device, an application program, a server, or a storage medium that performs the operations of the technical solutions of the present disclosure according to the prompt message.

[0116] As an optional but non-limiting implementation manner, the manner of sending a prompt message to the user in response to receiving the user's active request may be, for example, in the form of a pop-up window, and the prompt message may be presented in text in the pop-up window. In addition, the pop-up window may also carry a selection control for the user to choose "agree" or "disagree" to provide personal information to the electronic device.

[0117] It can be understood that the above process of notifying and obtaining the user's authorization is only illustrative and does not limit the implementation manner of the present disclosure. Other manners that comply with relevant laws and regulations can also be applied to the implementation manner of the present disclosure.

[0118] Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the present application is limited to these examples; under the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of brevity.

[0119] In addition, for simplicity of explanation and discussion, and so as not to make the embodiments of the present application difficult to understand, well-known power / ground connections to integrated circuit (IC) chips and other components may or may not be shown in the provided drawings. Further, the devices may be shown in block diagram form in order to avoid making the embodiments of the present application difficult to understand, and this also takes into account the fact that details of the implementation of such block diagram devices are highly dependent on the platform on which the embodiments of the present application are to be implemented (i.e., these details should be fully within the understanding of those skilled in the art). In cases where specific details (such as circuits) are set forth to describe exemplary embodiments of the present application, it will be apparent to those skilled in the art that the embodiments of the present application may be practiced without these specific details or with variations of these specific details. Accordingly, these descriptions should be considered illustrative rather than restrictive.

[0120] Although the present application has been described in connection with specific embodiments thereof, many alternatives, modifications, and variations will be apparent to those of ordinary skill in the art based on the foregoing description. For example, other memory architectures (such as dynamic RAM (DRAM)) may be used with the embodiments discussed.

[0121] Embodiments of the present application are intended to cover all such alternatives, modifications, and variations that fall within the broad scope of the claims of the present application. Accordingly, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of the present application shall be included within the protection scope of the present application.

Claims

1. A method for controlling an exhaust gas recirculation system, characterized in that: include: In response to determining a change in a misfire count value of the engine during a current working cycle, determining a target exhaust gas circulation rate based on the misfire count value, and determining whether an exhaust gas recirculation system meets an update condition based on the target exhaust gas circulation rate; In response to determining that the exhaust gas recirculation system meets the update condition, it is determined that the current working cycle ends, and the target exhaust gas circulation rate is determined as the exhaust gas circulation rate of the next working cycle of the exhaust gas recirculation system.

2. The exhaust gas recirculation system control method according to claim 1, characterized in that: The determining whether the exhaust gas recirculation system meets the updating condition according to the target exhaust gas circulation rate includes: In response to determining that the target exhaust gas circulation rate is less than the exhaust gas circulation rate of the current working cycle, determining that the exhaust gas recirculation system meets the update condition; In response to determining that the target exhaust gas circulation rate is greater than or equal to the exhaust gas circulation rate of the current working cycle, it is determined whether the exhaust gas recirculation system meets the update condition according to the target exhaust gas circulation rate and the historical minimum exhaust gas circulation rate in the current working cycle.

3. The exhaust gas recirculation system control method according to claim 2, characterized in that: The determining whether the exhaust gas recirculation system meets the updating condition according to the target exhaust gas circulation rate and the historical minimum exhaust gas circulation rate in the current working cycle includes: In response to determining that the target exhaust gas circulation rate is less than the historical minimum exhaust gas circulation rate and the duration is greater than or equal to a preset duration, it is determined that the exhaust gas recirculation system meets the update condition.

4. The exhaust gas recirculation system control method according to claim 2, characterized in that: The determining whether the exhaust gas recirculation system meets the updating condition according to the target exhaust gas circulation rate and the historical minimum exhaust gas circulation rate in the current working cycle includes: In response to determining that the target exhaust gas circulation rate is greater than or equal to the historical minimum exhaust gas circulation rate, determining that the exhaust gas recirculation system does not meet the update condition; or, In response to determining that the target exhaust gas circulation rate is less than the historical minimum exhaust gas circulation rate and the duration is less than a preset duration, it is determined that the exhaust gas recirculation system does not meet the update condition.

5. The exhaust gas recirculation system control method according to claim 4, characterized in that: Also includes: In response to determining that the exhaust gas recirculation system does not meet the update condition, continuously detecting the misfire count value of the engine in the current working cycle; In response to determining that the current working cycle ends and the exhaust gas circulation rate of the exhaust gas recirculation system is not updated, the exhaust gas circulation rate is determined as the exhaust gas circulation rate of the next working cycle of the exhaust gas recirculation system.

6. The exhaust gas recirculation system control method according to claim 1, characterized in that: The determining a target exhaust gas circulation rate based on the misfire count value comprises: determining a misfire diagnosis value according to the misfire count value and a misfire count threshold; acquiring relationship data between the misfire diagnostic value and a limit coefficient of a standard exhaust gas circulation rate, and determining a limit coefficient corresponding to the misfire diagnostic value based on the relationship data; The product of the limit value coefficient and the standard exhaust gas recirculation rate is determined as the target exhaust gas recirculation rate.

7. The exhaust gas recirculation system control method according to claim 6, characterized in that: Determining the misfire diagnosis value according to the misfire count value and the misfire count threshold value includes: determining a ratio of the misfire count value to a misfire count threshold as a misfire diagnosis value; or, A difference between the misfire count value and a misfire count threshold is determined, and a ratio of the difference to the misfire count threshold is determined as a misfire diagnostic value.

8. The exhaust gas recirculation system control method according to claim 1, characterized in that: Also includes: In response to determining that the misfire count value of the engine changes during the current working cycle and the misfire count value is greater than or equal to the misfire count threshold, the exhaust gas recirculation system is closed and an engine misfire fault alarm is issued.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the program, the method according to any one of claims 1 to 8 is implemented.

10. An engine, comprising a controller, characterized in that: The controller is used to execute the method according to any one of claims 1 to 8.

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