Hybrid valve stiction post-processing method, electronic device, and storage medium

Abstract

The application discloses a mixed valve sticking post-processing method, electronic equipment and storage medium, and the method comprises the following steps: if the mixed valve sticks before the engine starts, the mixed valve sticking opening degree is obtained; if the mixed valve sticking opening degree is less than the preset opening degree, the engine starting is prohibited, otherwise the engine starting is allowed; if the mixed valve sticks after the engine starts, the following measures are taken at the same time: limiting the maximum engine speed; limiting the minimum engine speed; limiting the vehicle speed; calculating the mixed valve sticking post-pressure ratio, determining whether to close the EGR or limit the EGR rate according to the mixed valve sticking post-pressure ratio; correcting the ignition efficiency; limiting the maximum engine torque. According to the engine starting before and after the sticking, the mixed valve sticking post-processing is carried out, when the engine can start and run, a series of actions are taken to optimize the engine control, improve the knocking, shaking and torque control precision problems caused by the mixed valve sticking after the engine, and effectively protect the engine.

Description

Technical Field

[0001] This invention relates to the field of engine control technology, specifically to a method for handling hybrid valve sticking, electronic equipment, and storage medium. Background Technology

[0002] Exhaust Gas Recirculation (EGR) draws exhaust gases from the exhaust system and introduces them into the intake system. Studies have shown that EGR systems offer advantages in improving emissions, reducing fuel consumption, and enhancing anti-knock capabilities. Low-pressure EGR, unlike high-pressure EGR, draws gas after the turbocharger, thus avoiding turbocharger efficiency loss. It can be used almost under all operating conditions, resulting in a more significant improvement in fuel efficiency. However, due to its lower pressure differential, a larger diameter valve is required to meet the flow requirements. Under certain operating conditions, the opening of the mixing valve needs to be controlled to adjust the pressure at the EGR valve outlet, thereby increasing the pressure difference across the EGR valve and improving the EGR rate. If the mixing valve malfunctions, the EGR rate control accuracy will deteriorate, failing to optimally improve fuel consumption and emissions, and may even cause engine vibration. Summary of the Invention

[0003] The purpose of this invention is to provide a method for handling mixing valve jamming, an electronic device, and a storage medium to solve the engine control problem after the mixing valve jams.

[0004] The technical solution adopted in this invention is as follows:

[0005] A method for handling the hysteresis of a mixing valve includes the following steps:

[0006] If the mixing valve becomes stuck before the engine starts, the stuck opening degree of the mixing valve is obtained; if the stuck opening degree of the mixing valve is less than the preset opening degree, the engine is prohibited from starting; if the stuck opening degree of the mixing valve is not less than the preset opening degree, the engine is allowed to start.

[0007] If the mixing valve becomes stuck after the engine is started, take the following measures simultaneously:

[0008] 1) Limit the engine's maximum speed;

[0009] 2) Limit the minimum engine speed;

[0010] 3) Limit vehicle speed;

[0011] 4) Calculate the mixing valve hysteresis pressure ratio by dividing the EGR valve outlet pressure by the atmospheric pressure. Determine whether to shut off the EGR or limit the EGR rate based on the mixing valve hysteresis pressure ratio, including:

[0012] 41) If the hysteresis pressure ratio of the mixing valve is greater than the first preset pressure ratio A or less than the second preset pressure ratio B, then the EGR is turned off; wherein the first preset pressure ratio A is greater than the second preset pressure ratio B;

[0013] If the hysteresis pressure ratio of the mixing valve is less than the third preset pressure ratio C, and the third preset pressure ratio C is less than the second preset pressure ratio B, then the EGR is turned off, and the target boost pressure is adjusted simultaneously.

[0014] 42) If the hysteresis pressure ratio of the mixing valve is not greater than the first preset pressure ratio A and not less than the second preset pressure ratio B, then the EGR rate is limited;

[0015] 5) Correct ignition efficiency;

[0016] 6) Limit the engine's maximum torque.

[0017] Furthermore, the preset opening depends on the current atmospheric pressure and the current engine coolant temperature. The calibration method is to ensure that the engine can start normally under different altitudes, different atmospheric temperatures, and the stuck opening of the mixing valve, and that the engine speed does not drop during the starting process and the engine speed is stable after returning to idle speed.

[0018] Furthermore, the maximum engine speed depends on atmospheric pressure and throttle opening, the minimum engine speed is 1000 rpm, and the vehicle speed is limited to no more than 65 km / h.

[0019] Furthermore, the target boost pressure adjustment method is as follows:

[0020] Obtain the original target boost pressure, and multiply the original target boost pressure by a preset coefficient k1 to obtain the adjusted target boost pressure. The preset coefficient k1 depends on the engine speed and the rate of change of the engine's requested torque. The lower the engine speed and the greater the rate of change of the engine's requested torque, the larger the preset coefficient k1 will be.

[0021] Furthermore, the EGR rate limiting method is as follows:

[0022] The target EGR rate is determined based on the target opening of the mixing valve, using the valve's sticking degree as the target opening degree. This target EGR rate is then used as the initial value r of the target EGR rate after the mixing valve sticks. EGRDsrdFDMARaw The target EGR rate r after the mixing valve hysteresis is obtained by correcting according to the following formula. EGRDsrdFDMA :

[0023] r EGRDsrdFDMA =max[(r EGRDsrdFDMARaw -Δ),0]

[0024] In the formula, Δ depends on the engine speed and the actual fresh air intake density. Its calibration method is that the EGR rate target control accuracy is within the first preset range, and the engine speed fluctuation is within the preset fluctuation range. The control accuracy is calculated by subtracting the actual EGR rate from the target EGR rate and then dividing by the target EGR rate.

[0025] If the actual EGR rate control accuracy is within the second preset range and the duration does not exceed the preset time, and the actual EGR rate control accuracy is within the first preset range in other cases, then the actual EGR rate control accuracy is considered to meet its target control accuracy requirement. When the actual EGR rate control accuracy is within the second preset range, optimization will be achieved through the correction of ignition efficiency so that the final EGR rate control accuracy is within the first preset range. The second preset range covers the first preset range.

[0026] Furthermore, the ignition efficiency correction method is as follows:

[0027] Based on engine speed, actual opening of the mixing valve after hysteresis, and target EGR rate r after mixing valve hysteresis. EGRDsrdFDMA Compared with the actual EGR rate r EGRAct The difference r EGRErr Determine the ignition efficiency correction factor k SprkEff The difference r between engine speed and EGR rate EGRErr The first correction factor is determined, and the second correction factor is determined based on the engine speed and the actual opening of the mixing valve after hysteresis. The ignition efficiency correction coefficient k is obtained by multiplying the first and second correction factors. SprkEff Finally, the ignition efficiency correction coefficient k SprkEff Multiply by the ignition efficiency before the mixing valve hysteresis to obtain the final ignition efficiency. Use the final ignition efficiency to look up the ignition angle efficiency curve to obtain the current final ignition angle, and then perform ignition control.

[0028] The calibration basis for the first and second correction factors is: the fluctuation interference of engine torque does not exceed the preset fluctuation interference range, and the fluctuation of engine speed is within the preset fluctuation range, no knocking occurs, and the actual control accuracy of EGR rate is within the first preset range.

[0029] Furthermore, the first preset pressure ratio A is 0.95, the second preset pressure ratio B is 0.85, the third preset pressure ratio C is 0.56, the first preset range is within ±1%, the second preset range is within ±2%, the preset fluctuation range is within ±15rpm, and the preset fluctuation interference range is within ±5Nm.

[0030] Furthermore, the method for limiting the maximum torque of the engine is as follows:

[0031] The engine maximum torque correction coefficient is determined based on the actual opening degree of the mixing valve after jamming, and multiplied by the maximum torque when jamming does not occur to obtain the engine maximum torque after jamming; the larger the actual opening degree of the mixing valve after jamming, the larger the engine maximum torque correction coefficient.

[0032] An electronic device, comprising:

[0033] Memory, used to store executable computer programs;

[0034] When a processor executes an executable computer program stored in a memory, it implements the hybrid valve jamming post-processing method described in any one of the above.

[0035] A computer-readable storage medium storing a computer program for implementing, when executed by a processor, the hybrid valve jamming post-processing method described in any one of the above.

[0036] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0037] This invention addresses the mixing valve sticking issue by performing separate processing for sticking before and after engine start-up. When the engine can start and run, a series of actions are taken to optimize engine control, improve knocking, vibration, and torque control accuracy problems caused by mixing valve sticking, and effectively protect the engine. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of a low-pressure EGR system;

[0039] Figure 2 This is a flowchart of the method for handling the hysteresis of a mixing valve.

[0040] In the diagram: 1-Air filter, 2-Turbocharger compressor, 3-Throttle valve, 4-Engine, 5-Turbocharger turbine, 6-Catalyst, 7-Particulate filter, 8-EGR cooler, 9-EGR valve, 10-EGR temperature sensor, 11-EGR differential pressure sensor, 12-Flow meter, 13-Linear oxygen sensor, 14-Mix valve. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0042] This invention proposes a method for handling the hysteresis of a mixing valve, which is one of the electronically controlled components of a low-pressure EGR system.

[0043] like Figure 1 As shown, the low-pressure EGR system includes an air filter 1, a turbocharger compressor 2, a throttle valve 3, an engine 4, a turbocharger turbine 5, a catalytic converter 6, a particulate filter 7, an EGR cooler 8, an EGR valve 9, an EGR temperature sensor 10, an EGR differential pressure sensor 11, a flow meter 12, a linear oxygen sensor 13, and a mixing valve 14, etc.

[0044] The system includes: a turbocharger compressor 2, used to compress fresh air for boosting; a turbocharger turbine 5, which controls the turbine's efficiency by controlling the opening of the turbocharger's exhaust bypass valve, thereby achieving different boosting capacities; and a low-pressure EGR system, which, compared to a non-low-pressure EGR system, adds the following components: an EGR cooler 8, an EGR temperature sensor 10, an EGR valve 9, an EGR differential pressure sensor 11, a mixing valve 14, a flow meter 12, and a linear oxygen sensor 13. The flow meter 12 is installed between the air filter 1 and the mixing valve 14 to detect the flow rate of fresh air entering the engine. The mixing valve 14 is used to adjust the pressure at the outlet of the EGR valve 9, increasing the pressure differential across the EGR valve 9 and improving the EGR rate. The mixing valve 14 includes a position sensor, an actuator motor, and a valve plate. The position sensor reads the position of the valve plate, i.e., the opening degree of the mixing valve. The actuator motor controls the valve plate's movement, ensuring the actual opening degree of the mixing valve follows the target opening degree. A linear oxygen sensor 13, installed between the compressor and the throttle valve 3, close to the throttle valve 3, detects the flow rate of the air-fuel mixture entering the cylinder. The EGR cooler 8 cools the exhaust gas, facilitating increased exhaust gas flow and reduced exhaust gas temperature. The EGR valve 9 throttles the exhaust gas flow rate into the cylinder. The EGR temperature sensor 10 detects the temperature of the exhaust gas entering the EGR valve. The EGR differential pressure sensor 11 detects the pressure difference between the two sides of the EGR valve. The low-pressure EGR system architecture is as follows: Figure 1 As shown.

[0045] Mixing valve sticking refers to the mixing valve plate failing to move. This is checked after the engine is powered on but before starting; the mixing valve's opening is controlled to check if it changes. If it doesn't change, the mixing valve is sticking. Similarly, if the target opening of the mixing valve changes during engine operation, but the actual opening remains unchanged, this also indicates mixing valve sticking.

[0046] This invention is a method for handling situations where jamming is detected in the mixing valve.

[0047] The mixing valve is in a fully open state by default, meaning it has its maximum opening. When there is a need to reduce the EGR valve outlet pressure, this is achieved by controlling the mixing valve opening to decrease. The specific method for calculating the target opening of the mixing valve can be found in patent CN202110184826.8, "Method for Determining the Target Opening of the Mixing Valve in an EGR System". This invention, after determining the target opening of the mixing valve, allows for rapid response to any jamming of the mixing valve, thereby protecting the engine.

[0048] The method for handling the hysteresis of the mixing valve of the present invention, such as Figure 2 As shown, it includes:

[0049] The first step is to read the current jamming opening of the mixing valve if there is any sticking before the engine starts. If the mixing valve opening is less than the preset opening, the engine is prevented from starting. If the jamming opening of the mixing valve is not less than the preset opening, the engine is allowed to start.

[0050] The preset opening depends on atmospheric pressure and the current engine coolant temperature (coolant temperature is simply referred to as water temperature). The calibration method for the preset opening is to ensure that the engine can still start normally under different altitudes and atmospheric temperatures, with no speed drop during the starting process (i.e., the speed change rate is not less than 0 and does not occur), and the engine speed is stable after starting and returning to idle (speed change rate is not greater than ±15 rpm / 10 ms). Based on this, the preset opening determined in this example is shown in Table 1.

[0051] Table 1 Preset Opening Degree Calibration Table

[0052]

[0053] The second step, if the mixing valve is still detected to be stuck after the engine is started, then:

[0054] 1) Limit engine speed. The maximum engine speed depends on atmospheric pressure and throttle opening. Avoid excessive engine speed, as shown in Table 2.

[0055] Table 2 Maximum Engine Speed

[0056]

[0057]

[0058] 2) At the same time, the minimum engine speed is limited to no less than 1000 rpm.

[0059] 3) At the same time, the speed limit is set to no more than 65 km / h to protect vehicle and driving safety.

[0060] 4) At the same time, based on the approximate pressure ratio between the outlet and inlet of the mixing valve (hereinafter referred to as the mixing valve hysteresis pressure ratio, which is calculated by dividing the EGR valve outlet pressure by atmospheric pressure), it is determined whether to close the EGR or limit the EGR rate.

[0061] 41) If the mixing valve hysteresis pressure ratio is greater than the preset pressure ratio A or less than the preset pressure ratio B, then EGR is turned off. In this example, preset pressure ratio A is 0.95, and preset pressure ratio B is 0.85. When the pressure ratio is too high, the EGR rate control accuracy after the mixing valve hysteresis is poor, easily leading to misfires. This pressure ratio is designed to avoid misfires. When the pressure ratio is too low, if EGR is activated, the turbine's working capacity is poor due to the reduced exhaust energy caused by the introduction of exhaust gas, resulting in poor engine torque response. This design is to avoid engine torque accuracy errors exceeding ±5% (target torque minus actual torque, then divided by the target torque to obtain the error).

[0062] Specifically, if the mixing valve hysteresis pressure ratio is less than the preset value C (0.56 in this example), not only is the EGR shut off, but due to the low compressor inlet pressure, the target boost pressure also needs to be adjusted to quickly respond to the engine torque request and improve the vehicle's low-speed response. Based on subjective drivability evaluation, the target boost pressure is optimized (the method for obtaining the original target boost pressure can be found in patent CN202010109549.X, "Method for Determining the Target Boost Pressure of an Exhaust Gas Turbocharged Engine, Storage Medium"). The optimized target boost pressure is then the original target boost pressure multiplied by a preset coefficient k1. k1 depends on the engine speed and the rate of change of the engine's requested firing torque. The lower the engine speed and the greater the rate of change of the engine's requested firing torque, the larger k1 becomes, thus improving the acceleration performance requirements after the mixing valve hysteresis and enhancing power. The specific preset coefficient calibration method avoids both insufficient power and excessive forward momentum. The specific calibration values ​​in this example are shown in Table 3, depending on the subjective drivability evaluation.

[0063] Table 3 Preset Coefficient Calibration Table

[0064]

[0065]

[0066] 42) If the pressure ratio after the mixing valve hysteresis is not greater than the preset pressure ratio A and not less than the preset pressure ratio B, then the current actual opening of the mixing valve is taken as the target opening of the mixing valve after hysteresis. According to the design in patent CN202110184826.8, "Method for Determining the Target Opening of the Mixing Valve in an EGR System", it can be seen that by determining the current target load (i.e., the target fresh air intake density, which is the target fresh air intake density entering the cylinder), the current engine speed, and the initial opening of the target mixing valve (replaced by the target opening of the mixing valve after hysteresis), the target EGR rate can be determined and used as the initial value r of the target EGR rate after the mixing valve hysteresis. EGRDsrdFDMARaw Furthermore, to ensure accurate EGR activation and prevent engine vibration, the target EGR rate r after the mixing valve hysteresis is corrected. EGRDsrdFDMA for:

[0067] r EGRDsrdFDMA =max[(r EGRDsrdFDMARaw -Δ),0]

[0068] Here, Δ depends on the engine speed and the actual fresh air intake density (i.e., the actual fresh air intake density entering the cylinder). Its calibration method is to ensure the target EGR rate control accuracy is ±1% (the control accuracy is calculated by subtracting the actual EGR rate from the target EGR rate, and then dividing by the target EGR rate). If the actual EGR rate control accuracy is within ±2% for no more than 0.1s, and otherwise within ±1%, then the actual EGR rate control accuracy is considered to meet its target control accuracy requirement. For control accuracy within ±2%, subsequent adjustments to ignition efficiency will be used to optimize the final EGR rate control accuracy to within ±1%), and engine speed fluctuations are within ±15rpm. Specific calibration data for this example are shown in Table 4.

[0069] Table 4 Δ Calibration Table

[0070]

[0071]

[0072] 5) Simultaneously, adjust ignition efficiency. Because mixing valve sticking can reduce EGR rate control accuracy and cause instability in engine cylinder exhaust gas, an excessively large ignition angle (ignition efficiency) poses a risk of knocking. To avoid knocking, reduce ignition efficiency. This is done based on engine speed, the actual opening of the mixing valve after sticking, and the target EGR rate r. EGRDsrdFDMA Compared with the actual EGR rate r EGRAct The difference r EGRErr Determine the ignition efficiency correction factor k SprkEff The difference r between engine speed and EGR rate EGRErrDetermine correction factor 1, and determine correction factor 2 based on engine speed and the actual opening degree of the hysteresis mixing valve. Multiply correction factor 1 and correction factor 2 to obtain the ignition efficiency correction coefficient k. SprkEff Finally, the ignition efficiency correction factor k is... SprkEff Multiplying the ignition efficiency before the mixing valve hysteresis yields the final ignition efficiency. By looking up the ignition efficiency against the ignition angle efficiency curve, the final ignition angle can be obtained for ignition control. Based on the calibration criteria, the engine torque fluctuation should not exceed ±5 Nm, the engine speed fluctuation should not exceed ±15 rpm, knocking should not occur, and the actual EGR rate control accuracy should be within ±1%. The calibration parameters shown in Tables 5 and 6 are then determined.

[0073] Table 5. Correction Factor 1 Calibration Table

[0074]

[0075] Table 6. Correction Factor 2 Calibration Table

[0076]

[0077]

[0078] It should be noted that the actual opening degree of the mixing valve is 100%, which indicates that the mixing valve is fully open and not throttling.

[0079] 6) Simultaneously, the engine's maximum torque capacity is limited. A maximum torque correction coefficient is determined based on the actual opening degree of the mixing valve after jamming, and multiplied by the maximum torque without jamming (the method for obtaining the maximum torque without jamming can be found in patent CN202010632793.4, "Method for Determining the Maximum Output Torque of a Gasoline Engine") to obtain the maximum engine torque after jamming, as shown in Table 7. Different opening degrees of jamming after mixing valve jamming will appropriately reduce the engine's charging efficiency. Based on this, the engine's maximum torque is limited to further protect the engine.

[0080] Table 7 Engine Maximum Torque Correction Factors

[0081] Actual opening degree (%) of the mixing valve after hysteresis 50 60 72 80 90 100 Engine maximum torque correction coefficient 0.6 0.75 0.8 0.85 0.9 1

[0082] The above completes the description of the method for handling the hysteresis of the mixing valve.

[0083] The present invention also provides an electronic device, comprising:

[0084] Memory, used to store executable computer programs;

[0085] When a processor executes an executable computer program stored in a memory, it implements the hybrid valve jamming post-processing method described in any one of the above.

[0086] The present invention also provides a computer-readable storage medium storing a computer program for implementing the hybrid valve jamming post-processing method described in any one of the above when executed by a processor.

[0087] In summary, this invention addresses the mixing valve sticking issue by treating the sticking before and after engine start-up. Once the engine can start and run, a series of actions optimize engine control, improve knocking, vibration, and torque control accuracy issues caused by sticking, and effectively protect the engine.

[0088] It should be noted that the sequence number of each step in the above embodiments does not imply 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 this application.

[0089] It should be noted that, depending on the implementation needs, the various steps / components described in this application can be broken down into more steps / components, or two or more steps / components or parts of the operation of steps / components can be combined into new steps / components to achieve the purpose of this invention.

[0090] Those skilled in the art will readily understand that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for handling the hysteresis of a mixing valve, characterized in that, Includes the following steps: If the mixing valve becomes stuck before the engine starts, the stuck opening degree of the mixing valve is obtained; if the stuck opening degree of the mixing valve is less than the preset opening degree, the engine is prohibited from starting; if the stuck opening degree of the mixing valve is not less than the preset opening degree, the engine is allowed to start. If the mixing valve becomes stuck after the engine is started, take the following measures simultaneously: 1) Limit the engine's maximum speed; 2) Limit the minimum engine speed; 3) Limit vehicle speed; 4) Calculate the mixing valve hysteresis pressure ratio by dividing the EGR valve outlet pressure by the atmospheric pressure. Determine whether to shut off the EGR or limit the EGR rate based on the mixing valve hysteresis pressure ratio, including: 41) If the hysteresis pressure ratio of the mixing valve is greater than the first preset pressure ratio A or less than the second preset pressure ratio B, then the EGR is turned off; wherein the first preset pressure ratio A is greater than the second preset pressure ratio B; If the hysteresis pressure ratio of the mixing valve is less than the third preset pressure ratio C, and the third preset pressure ratio C is less than the second preset pressure ratio B, then the EGR is turned off, and the target boost pressure is adjusted simultaneously. 42) If the hysteresis pressure ratio of the mixing valve is not greater than the first preset pressure ratio A and not less than the second preset pressure ratio B, then the EGR rate is limited; 5) Correct ignition efficiency; 6) Limit the engine's maximum torque.

2. The method for handling the hysteresis of a mixing valve according to claim 1, characterized in that, The preset opening depends on the current atmospheric pressure and the current engine coolant temperature. Its calibration method is to ensure that the engine can start normally under different altitudes, different atmospheric temperatures and the stuck opening of the mixing valve, and that the engine speed does not drop during the starting process and the engine speed is stable after returning to idle speed.

3. The method for handling the hysteresis of a mixing valve according to claim 1, characterized in that, The engine's maximum speed depends on atmospheric pressure and throttle opening. The minimum engine speed is 1000 rpm, and the vehicle speed is limited to no more than 65 km / h.

4. The method for handling the hysteresis of a mixing valve according to claim 1, characterized in that, The target boost pressure adjustment method is as follows: Obtain the original target boost pressure, and multiply the original target boost pressure by a preset coefficient k1 to obtain the adjusted target boost pressure. The preset coefficient k1 depends on the engine speed and the rate of change of the engine's requested torque. The lower the engine speed and the greater the rate of change of the engine's requested torque, the larger the preset coefficient k1 will be.

5. The method for handling the hysteresis of a mixing valve according to claim 1, characterized in that, The EGR rate limiting method is as follows: The target EGR rate is determined based on the target opening of the mixing valve, using the valve's sticking degree as the target opening degree. This target EGR rate is then used as the initial value r of the target EGR rate after the mixing valve sticks. EGRDsrdFDMARaw The target EGR rate r after the mixing valve hysteresis is obtained by correcting according to the following formula. EGRDsrdFDMA : r EGRDsrdFDMA =max[(r EGRDsrdFDMARaw -Δ),0] In the formula, Δ depends on the engine speed and the actual fresh air intake density. Its calibration method is that the EGR rate target control accuracy is within the first preset range, and the engine speed fluctuation is within the preset fluctuation range. The control accuracy is calculated by subtracting the actual EGR rate from the target EGR rate and then dividing by the target EGR rate. If the actual EGR rate control accuracy is within the second preset range and the duration does not exceed the preset time, and the actual EGR rate control accuracy is within the first preset range in other cases, then the actual EGR rate control accuracy is considered to meet its target control accuracy requirement. When the actual EGR rate control accuracy is within the second preset range, optimization will be achieved through the correction of ignition efficiency so that the final EGR rate control accuracy is within the first preset range. The second preset range covers the first preset range.

6. The method for handling the hysteresis of a mixing valve according to claim 5, characterized in that, The method for correcting ignition efficiency is as follows: Based on engine speed, actual opening of the mixing valve after hysteresis, and target EGR rate r after mixing valve hysteresis. EGRDsrdFDMA Compared with the actual EGR rate r EGRAct The difference r EGRErr Determine the ignition efficiency correction factor k SprkEff The difference r between engine speed and EGR rate EGRErr The first correction factor is determined, and the second correction factor is determined based on the engine speed and the actual opening of the mixing valve after hysteresis. The ignition efficiency correction coefficient k is obtained by multiplying the first and second correction factors. SprkEff Finally, the ignition efficiency correction coefficient k SprkEff Multiply by the ignition efficiency before the mixing valve hysteresis to obtain the final ignition efficiency. Use the final ignition efficiency to look up the ignition angle efficiency curve to obtain the current final ignition angle, and then perform ignition control. The calibration basis for the first and second correction factors is: the fluctuation interference of engine torque does not exceed the preset fluctuation interference range, and the fluctuation of engine speed is within the preset fluctuation range, no knocking occurs, and the actual control accuracy of EGR rate is within the first preset range.

7. The method for handling the hysteresis of a mixing valve according to claim 6, characterized in that, The first preset pressure ratio A is 0.95, the second preset pressure ratio B is 0.85, the third preset pressure ratio C is 0.56, the first preset range is within ±1%, the second preset range is within ±2%, the preset fluctuation range is within ±15rpm, and the preset fluctuation interference range is within ±5Nm.

8. The method for handling the hysteresis of a mixing valve according to claim 1, characterized in that, The method for limiting the maximum torque of an engine is as follows: The engine maximum torque correction coefficient is determined based on the actual opening degree of the mixing valve after jamming, and multiplied by the maximum torque when jamming does not occur to obtain the engine maximum torque after jamming; the larger the actual opening degree of the mixing valve after jamming, the larger the engine maximum torque correction coefficient.

9. An electronic device, characterized in that, include: Memory, used to store executable computer programs; A processor, when executing an executable computer program stored in a memory, implements the hybrid valve jamming post-processing method according to any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that, The device contains a computer program that, when executed by a processor, implements the hybrid valve jamming post-processing method according to any one of claims 1 to 8.

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