Mixing valve target opening degree determination method and device, equipment and storage medium

Abstract

The invention discloses a method, device and equipment for determining the target opening degree of a mixing valve and a storage medium, relates to the technical field of engine control, and discloses the method for determining the target opening degree of the mixing valve. Comprising the steps that a current change rate first correction coefficient and a current change rate second correction coefficient are determined based on throttle valve gas pressure data and / or engine rotating speed data; determining a current learning coefficient based on the mixing valve state information, the supercharger state information, and the engine state information; determining a change rate multiplication correction coefficient based on the current change rate first correction coefficient, the current change rate second correction coefficient and the current learning coefficient; and determining a target opening degree change rate of the mixing valve based on the change rate multiplication correction coefficient, and determining a target opening degree of the mixing valve based on the target opening degree change rate of the mixing valve. The opening change rate of the mixing valve is controlled and optimized, and then the control precision of the target opening of the mixing valve is ensured.

Description

Technical Field

[0001] The present application relates to the field of engine control technology, and in particular to a method, device, equipment and storage medium for determining a target opening of a mixing valve. Background Art

[0002] Exhaust Gas Recirculation (EGR) takes exhaust gas from the exhaust and enters the intake system. Studies have shown that the EGR system has certain advantages in improving emissions, reducing fuel consumption and improving anti-knock capabilities. The control of the mixing valve in the low-pressure EGR system is particularly important as it improves the effect of the EGR rate.

[0003] However, when the existing solution corrects the target opening of the mixing valve according to the operating parameters, it does not optimize the mixing valve opening change rate from the perspective of improving the intake pressure control stability when the mixing valve changes from fully open to partially open.

[0004] The above contents are only used to assist in understanding the technical solution of the present application and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The main purpose of this application is to provide a method, device, equipment and storage medium for determining the target opening of a mixing valve, aiming to solve the technical problem of how to optimize the mixing valve opening change rate from the perspective of improving the stability of intake pressure control to ensure the control accuracy of the mixing valve target opening.

[0006] To achieve the above objectives, the present application proposes a method for determining a target opening of a mixing valve, the method comprising:

[0007] Acquire throttle gas pressure data and engine speed data, and determine a first correction coefficient of a current change rate and a second correction coefficient of a current change rate based on the throttle gas pressure data and / or the engine speed data;

[0008] Acquiring mixing valve state information, supercharger state information, and engine state information, and determining a current learning coefficient based on the mixing valve state information, the supercharger state information, and the engine state information;

[0009] determining a change rate multiplication correction coefficient based on the current change rate first correction coefficient, the current change rate second correction coefficient, and the current learning coefficient;

[0010] A mixing valve target opening degree change rate is determined based on the change rate multiplication correction coefficient, and a target mixing valve opening degree is determined based on the mixing valve target opening degree change rate.

[0011] In one embodiment, the throttle valve gas pressure data includes throttle valve outlet pressure data and throttle valve inlet pressure data;

[0012] The step of determining the first correction coefficient of the current change rate and the second correction coefficient of the current change rate based on the throttle gas pressure data and / or the engine speed data comprises:

[0013] Determining first pressure ratio data and second pressure ratio data based on the throttle outlet pressure data and the throttle inlet pressure data;

[0014] determining a first correction coefficient of a current change rate based on the first pressure ratio data and the engine speed data;

[0015] A second correction coefficient of the current change rate is determined based on the second pressure ratio data.

[0016] In one embodiment, the step of determining a first correction coefficient of a current change rate based on the first pressure ratio data and the engine speed data comprises:

[0017] determining first pressure ratio fluctuation data and engine speed fluctuation data based on the first pressure ratio data and the engine speed data;

[0018] When the first pressure ratio fluctuation data and the engine speed fluctuation data satisfy a first preset fluctuation condition, a first correction coefficient of a historical change rate is obtained, and the first correction coefficient of the historical change rate is used as a first correction coefficient of a current change rate.

[0019] In one embodiment, when the first pressure ratio fluctuation data and the engine speed fluctuation data meet the first preset fluctuation condition, after the step of obtaining the first correction coefficient of the historical change rate and using the first correction coefficient of the historical change rate as the first correction coefficient of the current change rate, the process further includes:

[0020] When the first pressure ratio fluctuation data and the engine speed fluctuation data do not satisfy the first preset fluctuation condition, obtaining current first pressure ratio data based on the first pressure ratio data, and obtaining current engine speed data based on the engine speed data;

[0021] A current change rate first correction coefficient is determined based on the current first pressure ratio data and the current engine speed data.

[0022] In one embodiment, the step of determining a second correction coefficient of the current change rate based on the second pressure ratio data includes:

[0023] determining second pressure ratio fluctuation data based on the second pressure ratio data;

[0024] When the second pressure ratio fluctuation data meets the second preset fluctuation condition, a second correction coefficient of the historical change rate is obtained, and the second correction coefficient of the historical change rate is used as a second correction coefficient of the current change rate.

[0025] In one embodiment, when the second pressure ratio fluctuation data satisfies the second preset fluctuation condition, after the step of obtaining the second correction coefficient of the historical change rate and using the second correction coefficient of the historical change rate as the second correction coefficient of the current change rate, the method further includes:

[0026] When the second pressure ratio fluctuation data does not satisfy the second preset fluctuation condition, acquiring current second pressure ratio data based on the second pressure ratio data;

[0027] A second correction coefficient of a current change rate is determined based on the current second pressure ratio data.

[0028] In one embodiment, the step of determining the current learning coefficient based on the mixing valve state information, the supercharger state information and the engine state information comprises:

[0029] When the mixing valve state information, the supercharger state information and the engine state information meet a first preset condition, acquiring EGR rate data, boost pressure data and change rate difference data;

[0030] When the boost pressure data and the change rate difference data satisfy a second preset condition, a current learning coefficient is determined based on the throttle gas pressure data and the EGR rate data.

[0031] In one embodiment, when the boost pressure data and the change rate difference data meet a second preset condition, the step of determining the current learning coefficient based on the throttle gas pressure data and the EGR rate data includes:

[0032] When the boost pressure data and the change rate difference data meet a second preset condition, evaluating intake pressure responsiveness and EGR rate responsiveness based on the throttle gas pressure data and the EGR rate data to obtain intake pressure responsiveness evaluation results and EGR rate responsiveness evaluation results;

[0033] A current learning coefficient is determined based on the intake pressure responsiveness evaluation result and the EGR rate responsiveness evaluation result.

[0034] In one embodiment, the step of determining the current learning coefficient based on the intake pressure responsiveness evaluation result and the EGR rate responsiveness evaluation result comprises:

[0035] When the intake pressure responsiveness evaluation result is that the intake pressure responsiveness meets the preset first response condition, determining a learning coefficient increase value based on the EGR rate responsiveness evaluation result, and determining a current learning coefficient based on the learning coefficient increase value;

[0036] When the intake pressure responsiveness evaluation result shows that the intake pressure responsiveness meets the preset second response condition, a learning coefficient reduction value is determined based on the EGR rate responsiveness evaluation result, and a current learning coefficient is determined based on the learning coefficient reduction value.

[0037] In addition, to achieve the above-mentioned purpose, the present application also proposes a device for determining a target opening of a mixing valve, the device for determining a target opening of a mixing valve comprising:

[0038] a first coefficient determination module, configured to obtain throttle gas pressure data and engine speed data, and determine a first correction coefficient of a current change rate and a second correction coefficient of a current change rate based on the throttle gas pressure data and / or the engine speed data;

[0039] a coefficient second determination module, configured to obtain mixing valve state information, supercharger state information, and engine state information, and determine a current learning coefficient based on the mixing valve state information, the supercharger state information, and the engine state information;

[0040] a third coefficient determination module, configured to determine a change rate multiplication correction coefficient based on the current change rate first correction coefficient, the current change rate second correction coefficient, and the current learning coefficient;

[0041] The target opening determination module is used to determine the mixing valve target opening change rate based on the change rate multiplication correction coefficient, and determine the target mixing valve opening based on the mixing valve target opening change rate.

[0042] In addition, to achieve the above-mentioned purpose, the present application also proposes a device for determining the target opening of a mixing valve, the device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the method for determining the target opening of a mixing valve as described above.

[0043] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by the processor, the steps of the method for determining the target opening of the mixing valve as described above are implemented.

[0044] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the steps of the method for determining the target opening of the mixing valve as described above are implemented.

[0045] One or more technical solutions proposed in this application have at least the following technical effects:

[0046] The throttle gas pressure data and the engine speed data are obtained, and the first correction coefficient of the current change rate and the second correction coefficient of the current change rate are determined based on the throttle gas pressure data and / or the engine speed data; the mixing valve state information, the supercharger state information and the engine state information are obtained, and the current learning coefficient is determined based on the mixing valve state information, the supercharger state information and the engine state information; the change rate multiplication correction coefficient is determined based on the current change rate first correction coefficient, the current change rate second correction coefficient and the current learning coefficient; the mixing valve target opening change rate is determined based on the change rate multiplication correction coefficient, and the target mixing valve opening is determined based on the mixing valve target opening change rate. The mixing valve change rate is optimized through the throttle gas pressure data such as the actual throttle inlet pressure, the actual throttle outlet pressure and the throttle outlet target pressure, and the mixing valve opening change rate correction coefficient is learned according to the mixing valve state, the supercharger state and the engine state, so that the mixing valve opening change rate is controlled and optimized from the perspective of intake pressure control stability, thereby ensuring the control accuracy of the mixing valve target opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0048] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0049] Figure 1 A schematic diagram of a flow chart provided in Example 1 of a method for determining a target opening of a mixing valve of the present application;

[0050] Figure 2 A low-pressure EGR system architecture diagram provided for the first embodiment of the method for determining the target opening of a mixing valve of the present application;

[0051] Figure 3 A flow chart of a second embodiment of a method for determining a target opening of a mixing valve according to the present application;

[0052] Figure 4 A schematic diagram of a brief flow chart of a method for determining a target opening of a mixing valve provided in Example 2 of the present application;

[0053] Figure 5 This is a schematic diagram of the module structure of a device for determining a target opening of a mixing valve according to an embodiment of the present application;

[0054] Figure 6Schematic diagram of the equipment structure of the hardware operating environment involved in the method for determining the target opening of a mixing valve in an embodiment of the present application.

[0055] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0056] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0057] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0058] The main solution of the embodiment of the present application is: obtaining throttle gas pressure data and engine speed data, and determining a first correction coefficient of a current change rate and a second correction coefficient of a current change rate based on the throttle gas pressure data and / or the engine speed data; obtaining mixing valve status information, supercharger status information and engine status information, and determining a current learning coefficient based on the mixing valve status information, the supercharger status information and the engine status information; determining a change rate multiplication correction coefficient based on the current first change rate correction coefficient, the current second change rate correction coefficient and the current learning coefficient; determining a mixing valve target opening change rate based on the change rate multiplication correction coefficient, and determining a target mixing valve opening based on the mixing valve target opening change rate.

[0059] In this embodiment, for the convenience of description, the following description is made by taking the identification of the mixing valve target opening determination device as the execution subject.

[0060] Exhaust Gas Recirculation (EGR) takes exhaust gas from the exhaust and enters the intake system. Studies have shown that the EGR system has certain advantages in improving emissions, reducing fuel consumption and improving anti-knock capabilities. The control of the mixing valve in the low-pressure EGR system is particularly important as it improves the effect of the EGR rate.

[0061] The present application provides a solution to optimize the mixing valve opening change rate from improving the intake pressure control stability during the mixing valve fully open to partially open process, so as to ensure the control accuracy of the mixing valve target opening.

[0062] It should be noted that the execution subject of this embodiment may be a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device capable of realizing the above functions, a device for determining the target opening of a mixing valve, etc. The following takes the device for determining the target opening of a mixing valve as an example to illustrate this embodiment and the following embodiments.

[0063] Based on this, the embodiment of the present application provides a method for determining the target opening of a mixing valve, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the method for determining the target opening of a mixing valve of the present application.

[0064] In this embodiment, the method for determining the target opening of the mixing valve includes steps S10 to S40:

[0065] Step S10, acquiring throttle gas pressure data and engine speed data, and determining a first correction coefficient of a current change rate and a second correction coefficient of a current change rate based on the throttle gas pressure data and / or the engine speed data;

[0066] It should be noted that the method for determining the target opening of the mixing valve of the present application is applied to the low-pressure EGR system, please refer to Figure 2 , Figure 2 This is a low-pressure EGR system architecture diagram provided in Example 1 of the method for determining the target opening of the mixing valve of this application. Figure 2 As shown, the low-pressure EGR system includes: air filter, mixing valve, supercharger compressor, throttle, engine, supercharger turbine, catalyst, particulate matter trap, EGR cooler, EGR valve, EGR temperature sensor, EGR differential pressure sensor, flow meter and linear oxygen sensor. The supercharger compressor compresses fresh air for supercharging; the supercharger turbine controls the working efficiency of the turbine by controlling the opening of the supercharger's exhaust bypass valve, thereby achieving different supercharging capabilities; the low-pressure EGR system has the following additional components compared to the non-low-pressure EGR system: EGR cooler, EGR temperature sensor, EGR valve, EGR pressure difference sensor, mixing valve, flow meter and oxygen sensor; the flow meter is installed between the air filter and the mixing valve to detect the fresh air flow entering the engine; the mixing valve is used to adjust the pressure at the outlet of the EGR valve, increase the pressure difference at both ends of the EGR valve, and increase the EGR rate; the oxygen sensor is installed between the compressor and the throttle, close to the throttle, and is used to detect the mixed gas flow entering the cylinder; the EGR cooler is used to cool the exhaust gas to facilitate increasing the exhaust gas flow and reducing the exhaust gas temperature; the EGR valve has a throttling effect to control the exhaust gas flow entering the cylinder; the EGR temperature sensor is used to detect the exhaust gas temperature entering the EGR valve; the EGR pressure difference sensor is used to detect the pressure at the EGR inlet and outlet.

[0067] It should be noted that the throttle gas pressure data includes the throttle outlet pressure data and the throttle inlet pressure data, wherein the throttle outlet pressure data refers to the actual gas pressure p after the throttle AftThrAct and the target gas pressure after the throttle valve p AftThrDesd The throttle inlet pressure data refers to the actual gas pressure p before the throttle BfThrAct, the engine speed data refers to the engine speed n. According to the actual gas pressure p after the throttle valve AftThrAct , Target gas pressure after throttle valve p AftThrDesd , Actual gas pressure before throttle valve p BfThrAct And the engine speed n can calculate two correction coefficients, namely the current change rate first correction coefficient and the second correction coefficient of the current rate of change Used to adjust the mixing valve opening rate.

[0068] In a feasible implementation manner, the step of determining the first correction coefficient of the current change rate and the second correction coefficient of the current change rate based on the throttle gas pressure data and / or the engine speed data in step S10 may include steps S11 to S13:

[0069] Step S11, determining first pressure ratio data and second pressure ratio data based on the throttle outlet pressure data and the throttle inlet pressure data;

[0070] It should be noted that the throttle outlet pressure data includes the actual gas pressure p after the throttle AftThrAct and the target gas pressure after the throttle valve p AftThrDesd , the throttle inlet pressure includes the actual gas pressure p before the throttle BfThrAct The first pressure ratio data refers to the actual gas pressure p after the throttle valve. AftThrAct and the target gas pressure after the throttle valve p AftThrDesd Ratio The second pressure ratio data refers to the actual gas pressure p after the throttle valve AftThrAct and the actual gas pressure before the throttle valve p BfThrAct Ratio

[0071] Step S12, determining a first correction coefficient of a current change rate based on the first pressure ratio data and the engine speed data;

[0072] It should be understood that the first correction coefficient of the current rate of change is based on the first pressure ratio data and the correction factor determined by the engine speed n, express.

[0073] It should be noted that the pressure ratio The smaller it is, the slower the intake pressure control response is. In order to improve the intake pressure control accuracy, it is necessary to reduce the mixing valve opening change rate, thereby increasing the gas flow entering the supercharger compressor, increasing the throttle inlet pressure, and increasing the actual intake pressure; pressure ratio If it is too large, it means that the intake pressure control response is too fast. In order to improve the intake pressure control accuracy, it is necessary to increase the mixing valve opening change rate, so as to reduce the gas flow entering the supercharger compressor as soon as possible, reduce the throttle inlet pressure, and reduce the actual intake pressure. When it is 1, by adjusting different pressure ratios Get Ensure that during the transition from fully open to partially open mixing valve, the difference between the actual intake pressure and the target intake pressure does not exceed ±3kPa for more than 0.5s.

[0074] In a feasible implementation, step S12 may include: determining first pressure ratio fluctuation data and engine speed fluctuation data based on the first pressure ratio data and the engine speed fluctuation data; when the first pressure ratio fluctuation data and the engine speed fluctuation data meet a first preset fluctuation condition, obtaining a first correction coefficient of the historical change rate, and using the first correction coefficient of the historical change rate as the first correction coefficient of the current change rate.

[0075] It should be noted that the first pressure ratio data includes the historical first pressure ratio data and the current first pressure ratio data, wherein the historical first pressure ratio data refers to the pressure ratio in the last sampling period. The current first pressure ratio data refers to the pressure ratio in this sampling period. The first pressure ratio fluctuation data refers to the pressure ratio under this sampling period. The pressure ratio of the previous sampling period The engine speed fluctuation data refers to the difference between the engine speed in this sampling period and the engine speed in the previous sampling period.

[0076] It should be understood that in order to avoid the engine speed n and Too frequent fluctuations lead to If the adjustment change is too large, the multiplication correction coefficient r1 of the mixing valve opening change rate will change too much, resulting in excessive fluctuation of the mixing valve opening control, which will lead to poor stability of the mixing valve control. When the first pressure ratio fluctuation data and the engine speed fluctuation data meet the first preset fluctuation condition, the first correction coefficient of the change rate will not be adjusted. Instead, the first correction coefficient of the rate of change determined in the previous sampling period is obtained. That is, the first correction coefficient of the historical change rate is used as the first correction coefficient of the current change rate.

[0077] In a specific implementation, the first pressure ratio fluctuation data and the engine speed fluctuation data satisfy the first preset fluctuation condition, which means that the engine speed n fluctuation (the difference between the engine speed in this sampling period and the engine speed in the previous sampling period, the sampling period in this embodiment is 10ms) does not exceed the preset value (in this embodiment, ±40rpm) and Fluctuation (pressure ratio in this sampling period The pressure ratio of the previous sampling period The difference between the sampling period (the sampling period in this embodiment is 10 ms) does not exceed a preset value (in this embodiment, it is ±0.1).

[0078] In another feasible implementation, step S12 also includes: when the first pressure ratio fluctuation data and the engine speed fluctuation data do not meet the first preset fluctuation condition, obtaining the current first pressure ratio data based on the first pressure ratio data, and obtaining the current engine speed data based on the engine speed data; determining the first correction coefficient of the current change rate based on the current first pressure ratio data and the current engine speed data.

[0079] It should be understood that when the first pressure ratio fluctuation data does not meet the first preset fluctuation condition, the first pressure ratio fluctuation data will be based on the current first pressure ratio data. Update the first correction coefficient of the change rate Get the first correction coefficient of the current change rate.

[0080] Step S13: determining a second correction coefficient of the current change rate based on the second pressure ratio data.

[0081] It should be understood that the second correction coefficient of the current rate of change is based on the second pressure ratio data Determine the correction factor using express.

[0082] It should be noted that after calibration Afterwards, it will be adjusted To determine In pressure ratio The larger the value, the smaller the difference between the throttle inlet and outlet pressures. In this case, it is more necessary to reduce the rate of change of the mixing valve opening. By slowing down the decrease in the throttle inlet pressure, the impact of the intake pressure can be reduced. This ensures that during the transition from full opening to part opening of the mixing valve, the difference between the actual intake pressure and the target intake pressure does not exceed ±3 kPa for more than 0.5 s. When is 1, The ratio of the throttle outlet pressure to the inlet pressure is set to 0 mainly because the throttle inlet pressure response is poor and the parameters of the ratio of the throttle outlet pressure to the inlet pressure need to be adjusted. Otherwise, no adjustment is required to avoid affecting the EGR rate response accuracy (ensuring that the difference between the target EGR rate and the actual EGR rate exceeds the preset value ±0.15 for no more than 0.3s).

[0083] In a feasible implementation, step S13 may include: determining second pressure ratio fluctuation data based on the second pressure ratio data; when the second pressure ratio fluctuation data meets a second preset fluctuation condition, obtaining a second coefficient for correcting the historical change rate, and using the second coefficient for correcting the historical change rate as a second correction coefficient for the current change rate.

[0084] It should be noted that the second pressure ratio data includes historical second pressure ratio data and current second pressure ratio data, wherein the historical second pressure ratio data refers to the pressure ratio under the last sampling period. The current second pressure ratio data refers to the pressure ratio in this sampling period. The second pressure ratio fluctuation data refers to the pressure ratio under this sampling period. The pressure ratio of the previous sampling period difference.

[0085] It should be understood that in order to avoid Too frequent fluctuations lead to If the adjustment change is too large, the multiplication correction coefficient r1 of the mixing valve opening change rate will change too much, resulting in excessive fluctuation of the mixing valve opening control, which will lead to poor stability of the mixing valve control. When the second pressure ratio fluctuation data meets the second preset fluctuation condition, the second correction coefficient of the change rate will not be adjusted. Instead, the second correction coefficient of the historical change rate is obtained, that is, the second correction coefficient of the change rate determined in the last sampling period. Use it as the second correction coefficient of the current change rate.

[0086] In a specific implementation, the second pressure ratio fluctuation data satisfies the second preset fluctuation condition, which means: Fluctuation (pressure ratio in this sampling period The pressure ratio of the previous sampling period The difference between the sampling period and the sampling period (the sampling period in this embodiment is 10 ms) does not exceed the preset value (the sampling period in this embodiment is ±0.03).

[0087] In another feasible implementation, step S13 may further include: when the second pressure ratio fluctuation data does not meet the second preset fluctuation condition, obtaining current second pressure ratio data based on the second pressure ratio data; and determining a second correction coefficient of the current change rate based on the current second pressure ratio data.

[0088] It should be understood that when the second pressure ratio fluctuation data does not meet the second preset fluctuation condition, the second pressure ratio fluctuation data will be based on the current second pressure ratio data. Update the second correction coefficient of the change rate Get the second correction coefficient of the current change rate.

[0089] Step S20, acquiring mixing valve state information, supercharger state information and engine state information, and determining a current learning coefficient based on the mixing valve state information, the supercharger state information and the engine state information;

[0090] It should be noted that the current learning coefficient refers to the learning coefficient r of the mixing valve opening change rate multiplication correction coefficient r1 Lrn , whose default value is 0 and can be saved after the vehicle is powered off. The mixing valve status information refers to the current opening or position status of the mixing valve, the supercharger status information refers to the working status of the supercharger, and the engine status information includes the engine target intake pressure change rate information and the engine mileage information corresponding to the learning coefficient not being updated.

[0091] It should be understood that when the mixing valve state information, the supercharger state information and the engine state information do not meet the preset conditions, the historical learning coefficient r1 of the mixing valve opening change rate multiplication correction coefficient r1 is obtained. Lrn (z), the historical learning coefficient r Lrn (z) is the current learning coefficient r Lrn , that is, r Lrn =r Lrn (z)+0.1, where the historical learning coefficient r Lrn (z) refers to the self-learning correction coefficient obtained from the last learning. When the mixing valve status information, supercharger status information and engine status information meet the preset conditions, the intake pressure responsiveness and EGR rate responsiveness of the low-pressure EGR system will be evaluated, and the historical learning coefficient r will be adjusted according to the evaluation results. Lrn (z) is updated to obtain the current learning coefficient r Lrn .

[0092] Step S30, determining a change rate multiplication correction coefficient based on the current change rate first correction coefficient, the current change rate second correction coefficient and the current learning coefficient;

[0093] It should be understood that in determining the first correction coefficient of the current rate of change Second correction coefficient of current change rate and the current learning coefficient r Lrn After that, a comprehensive change rate multiplication correction coefficient r1 can be calculated. This coefficient is used to fine-tune the target opening change rate of the mixing valve to achieve more accurate control of the target mixing valve opening.

[0094] Exemplarily, the calculation formula of the change rate multiplication correction coefficient r1 is as follows:

[0095]

[0096] Step S40, determining a mixing valve target opening change rate based on the change rate multiplication correction coefficient, and determining a target mixing valve opening based on the mixing valve target opening change rate.

[0097] It should be understood that the target opening change rate is used to indicate how fast the mixing valve opening should be adjusted to achieve the target mixing valve opening. After obtaining the change rate multiplication correction coefficient r1, the final mixing valve opening change rate, i.e., the target opening change rate, can be determined based on the change rate multiplication correction coefficient r1. The ideal opening of the mixing valve, i.e., the target mixing valve opening, can be calculated based on the target opening change rate to optimize the engine's intake efficiency and combustion performance while meeting emission requirements.

[0098] The present embodiment provides a method for determining a target opening of a mixing valve, which obtains throttle gas pressure data and engine speed data, and determines a first correction coefficient of a current change rate and a second correction coefficient of a current change rate based on the throttle gas pressure data and / or the engine speed data, obtains mixing valve status information, supercharger status information and engine status information, and determines a current learning coefficient based on the mixing valve status information, the supercharger status information and the engine status information; determines a change rate multiplication correction coefficient based on the current first change rate correction coefficient, the current second change rate correction coefficient and the current learning coefficient; determines a mixing valve target opening change rate based on the change rate multiplication correction coefficient, and determines a target mixing valve opening based on the mixing valve target opening change rate. The mixing valve change rate is optimized through throttle gas pressure data such as the actual throttle inlet pressure, the actual throttle outlet pressure and the throttle outlet target pressure, and the mixing valve opening change rate correction coefficient is learned according to the mixing valve state, the supercharger state and the engine state. From the perspective of intake pressure control stability, the mixing valve opening change rate is controlled and optimized, thereby ensuring the control accuracy of the mixing valve target opening.

[0099] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can be referred to the above introduction, and will not be repeated in the following. Figure 3 The step of determining the current learning coefficient based on the mixing valve state information, the supercharger state information and the engine state information in step S20 may include steps S21 to S22:

[0100] Step S21, when the mixing valve state information, the supercharger state information and the engine state information meet a first preset condition, acquiring EGR rate data, boost pressure data and change rate difference data;

[0101] It should be understood that the purpose of updating the learning coefficient of the mixing valve opening change rate multiplication correction coefficient r1 is to improve the intake pressure responsiveness and EGR rate response accuracy during the control process. Lrn , it is necessary to first determine whether to activate the learning coefficient update strategy based on the mixing valve status information, the supercharger status information, and the engine status information. If the mixing valve status information, the supercharger status information, and the engine status information do not meet the first preset condition, the judgment result is that the learning coefficient update strategy is not activated, and the historical learning coefficient is obtained, and the historical learning coefficient is used as the current learning coefficient. If the mixing valve status information, the supercharger status information, and the engine status information meet the first preset condition, the judgment result is that the learning coefficient update strategy is activated, and the EGR rate data, the boost pressure data, and the change rate difference data are obtained to update the learning coefficient according to the learning coefficient update strategy to obtain the current learning coefficient.

[0102] It should be noted that the mixing valve status information, the supercharger status information and the engine status information satisfying the first preset condition means that the following conditions (the engine is in a large transient operating condition) are met at the same time: (1) the mixing valve is in the transition process from fully open to not fully open; (2) the supercharger is in a closed-loop control activation state; (3) the absolute value of the engine target intake pressure change rate exceeds the preset value, which is 25 kPa / 10 ms in this embodiment; (4) the engine mileage corresponding to the failure of the learning coefficient to be updated exceeds the preset value, which is 20,000 kilometers in this embodiment.

[0103] Step S22, when the boost pressure data and the change rate difference data meet a second preset condition, determine a current learning coefficient based on the throttle gas pressure data and the EGR rate data.

[0104] It should be noted that when the learning coefficient update strategy is activated, the learning coefficient update method will be determined based on the EGR rate data, boost pressure data, and change rate difference data to determine the current learning coefficient. Among them, the boost pressure data refers to the difference between the target boost pressure and the actual boost pressure, and the change rate difference data refers to dpct MGVNew -dpct MGVRaw Among them, during the transition from fully open to partially open mixing valve, the final mixing valve opening change rate dpct MGVNew =dpct MGVRaw ×r1.

[0105] In addition, it should be noted that the boost pressure data and the change rate difference data satisfying the second preset condition means that the following conditions are met at the same time: (1) the difference between the target boost pressure and the actual boost pressure does not exceed the preset value, which is ±2 kPa in this embodiment; (2) dpct MGVNew -dpct MGVRaw The ratio does not exceed a preset value, which is -15% / 10ms in this embodiment.

[0106] It should be understood that when the boost pressure data and the change rate difference data meet the second preset condition, it is determined how to update the learning coefficient according to the throttle gas pressure data and the EGR rate data to obtain the current learning coefficient.

[0107] In a feasible implementation, step S22 may include steps A31 to A32:

[0108] Step A31, when the boost pressure data and the change rate difference data meet a second preset condition, evaluating intake pressure responsiveness and EGR rate responsiveness based on the throttle gas pressure data and the EGR rate data, and obtaining intake pressure responsiveness evaluation results and EGR rate responsiveness evaluation results;

[0109] It should be understood that when the boost pressure data and the rate of change difference data meet the second preset condition, the intake pressure responsiveness and the EGR rate responsiveness will be evaluated according to the throttle gas pressure data and the EGR rate data, so as to determine the specific updating method of the learning coefficient according to the evaluation result and obtain the current learning coefficient. The throttle gas pressure data refers to the actual gas pressure p after the throttle valve. AftThrAct and the target gas pressure after the throttle valve p AftThrDesd , EGR rate data refers to the difference between the target EGR rate and the actual EGR rate.

[0110] It should be noted that during the operation of the low-pressure EGR system, the actual gas pressure p behind the throttle valve will be continuously collected. AftThrAct and the target gas pressure after the throttle valve p AftThrDesd Ratio when When the continuous time greater than the second preset pressure ratio exceeds the preset time interval, the counter CNT1 is updated; When the continuous time of the pressure ratio being less than the first preset pressure ratio exceeds the preset time interval, the counter CNT2 is updated. The updating method of CNT1 and CNT2 is to update only once in each driving cycle and execute only when the corresponding updating condition is met, and in the learning coefficient r Lrn After the update, it will be restored to 0 immediately.

[0111] Additionally, it should be noted that evaluating intake pressure responsiveness and EGR rate responsiveness based on throttle gas pressure data and EGR rate data includes: evaluating intake pressure responsiveness according to throttle gas pressure data; evaluating EGR rate responsiveness according to EGR rate data.

[0112] The process of evaluating the intake pressure responsiveness according to the throttle gas pressure data is as follows: when CNT1 exceeds the pre-designed value, the intake pressure responsiveness evaluation result is determined as too aggressive intake pressure responsiveness; when CNT2 exceeds the pre-designed value, the intake pressure responsiveness evaluation result is determined as poor intake pressure responsiveness. Evaluating the EGR rate responsiveness according to the EGR rate data includes: when the difference between the target EGR rate and the actual EGR rate does not exceed the preset first EGR rate difference, the EGR rate responsiveness evaluation result is determined as good EGR rate responsiveness; when the difference between the target EGR rate and the actual EGR rate exceeds the preset second EGR rate difference, the EGR rate responsiveness evaluation result is determined as poor EGR rate responsiveness.

[0113] Step A32, determining a current learning coefficient based on the intake pressure responsiveness evaluation result and the EGR rate responsiveness evaluation result.

[0114] It should be understood that since the purpose of updating the learning coefficient is to improve the intake pressure responsiveness and EGR rate response accuracy during the control process, the learning coefficient will only be updated to obtain the current learning coefficient when the intake pressure responsiveness evaluation result is that the intake pressure responsiveness is too aggressive or the intake pressure responsiveness is poor, and the EGR rate responsiveness evaluation result is that the EGR rate responsiveness is good or the EGR rate responsiveness is poor. Otherwise, the historical learning coefficient will be obtained as the current learning coefficient.

[0115] In a feasible embodiment, step A32 may include: when the intake pressure responsiveness evaluation result is that the intake pressure responsiveness meets a preset first response condition, determining a learning coefficient increase value based on the EGR rate responsiveness evaluation result, and determining a current learning coefficient based on the learning coefficient increase value; when the intake pressure responsiveness evaluation result is that the intake pressure responsiveness meets a preset second response condition, determining a learning coefficient decrease value based on the EGR rate responsiveness evaluation result, and determining the current learning coefficient based on the learning coefficient decrease value.

[0116] It should be understood that the intake pressure responsiveness evaluation result that the intake pressure responsiveness meets the preset first response condition means that the intake pressure responsiveness is too aggressive. In this case, it is necessary to increase the learning coefficient r of the multiplication correction coefficient r1 of the mixing valve opening change rate. Lrn, to improve the intake pressure responsiveness; the intake pressure responsiveness evaluation result is that the intake pressure responsiveness meets the preset second response condition, which means that the intake pressure responsiveness is poor. At this time, it is necessary to reduce the learning coefficient r of the multiplication correction coefficient r1 of the mixing valve opening change rate. Lrn , to avoid excessive overshoot of intake pressure responsiveness. The EGR rate responsiveness evaluation result is used to determine the specific size of the learning coefficient increase or decrease.

[0117] In the specific implementation, step S22 corresponds to five different scenarios:

[0118] The first scenario corresponds to the situation where the intake pressure responsiveness is poor but the EGR rate responsiveness is good, which requires both of the following to be met: (1) The number of times CNT1 that the continuous time less than the preset value (0.9) exceeds the preset value (0.8s in this embodiment) exceeds the preset value (10 in this embodiment); (2) The difference between the target EGR rate and the actual EGR rate does not exceed the preset value, which is ±0.1 in this embodiment; (3) The difference between the target boost pressure and the actual boost pressure does not exceed the preset value, which is ±2kPa in this embodiment; (4) dpct MGVNew -dpct MGVRaw The ratio of does not exceed the preset value. In this embodiment, -15% / 10ms is required to further increase the learning coefficient rLrn of the multiplication correction coefficient r1 of the mixing valve opening change rate to improve the intake pressure responsiveness. Lrn =r Lrn (z)+0.1, where r Lrn (z) is the self-learning correction coefficient obtained from the last learning.

[0119] The second scenario corresponds to the situation where the intake pressure response is too aggressive, but the EGR rate response is good, which requires both of the following conditions to be met: (1) The number of times CNT1 that the continuous time that is less than the preset value (0.9) exceeds the preset value (0.8s in this embodiment) exceeds the preset value (10 in this embodiment); (2) the continuous time that the difference between the target EGR rate and the actual EGR rate exceeds the preset value (±0.15 in this embodiment) does not exceed the preset value, which is 0.2s in this embodiment; (3) the difference between the target boost pressure and the actual boost pressure does not exceed the preset value, which is ±2kPa in this embodiment; (4) dpct MGVNew -dpct MGVRaw The ratio of does not exceed the preset value, which is -15% / 10ms in this embodiment. At this time, it is necessary to appropriately reduce the learning coefficient rLrn of the multiplication correction coefficient r1 of the mixing valve opening change rate to avoid excessive overshoot of the intake pressure response. Lrn =r Lrn (z)-0.04, where r Lrn (z) is the self-learning correction coefficient obtained from the last learning.

[0120] The third scenario corresponds to the situation where the intake pressure responsiveness is poor and the EGR rate responsiveness is poor, and the following conditions must be met at the same time: (1) The number of times CNT1 that the continuous time that is less than the preset value (0.9) exceeds the preset value (0.8s in this embodiment) exceeds the preset value (10 in this embodiment); (2) the continuous time that the difference between the target EGR rate and the actual EGR rate exceeds the preset value (±0.15 in this embodiment) does not exceed the preset value, which is 0.2s in this embodiment; (3) the difference between the target boost pressure and the actual boost pressure does not exceed the preset value, which is ±2kPa in this embodiment; (4) dpct MGVNew -dpct MGVRaw The ratio of does not exceed the preset value, which is -15% / 10ms in this embodiment. At this time, it is necessary to increase the learning coefficient rLrn of the multiplication correction coefficient r1 of the mixing valve opening change rate to a small extent to improve the intake pressure responsiveness, r Lrn =r Lrn (z)+0.03, where r Lrn (z) is the self-learning correction coefficient obtained from the last learning.

[0121] The fourth scenario corresponds to the situation where the intake pressure response is too aggressive but the EGR rate response is poor, which requires both of the following conditions to be met: (1) The number of times CNT2 that the continuous time greater than the preset value (1.2) exceeds the preset value (0.8s in this embodiment) exceeds the preset value (10 in this embodiment); (2) the continuous time that the difference between the target EGR rate and the actual EGR rate exceeds the preset value (±0.15 in this embodiment) does not exceed the preset value, which is 0.2s in this embodiment; (3) the difference between the target boost pressure and the actual boost pressure does not exceed the preset value, which is ±2kPa in this embodiment; (4) dpct MGVNew -dpct MGVRaw The ratio of does not exceed the preset value, which is -15% / 10ms in this embodiment. At this time, the learning coefficient r of the multiplication correction coefficient r1 of the mixing valve opening change rate needs to be reduced to a small extent. L rn, avoid excessive overshoot of intake pressure response, r Lrn =r Lrn (z)-0.02, where r Lrn (z) is the self-learning correction coefficient obtained from the last learning.

[0122] The fifth scenario corresponds to other scenarios except the first to fourth scenarios above. Adapt =r Adapt (z), where r Lrn (z) is the self-learning correction coefficient obtained from the last learning.

[0123] It should be understood that if the learning coefficient is updated, it will no longer be updated in the current driving cycle.

[0124] For example, in order to help understand the implementation process of the method for determining the target opening of the mixing valve obtained by combining this embodiment with the above-mentioned embodiment 1, please refer to Figure 4 , Figure 4 A brief flow chart of a method for determining a target opening of a mixing valve is provided. Specifically, throttle gas pressure data includes actual throttle inlet pressure, actual throttle outlet pressure, and throttle outlet target pressure. A first correction coefficient of a current change rate and a second correction coefficient of a current change rate are determined based on the actual throttle inlet pressure, the actual throttle outlet pressure, and the throttle outlet target pressure to optimize the mixing valve change rate. After the mixing valve change rate is learned and updated (i.e., the current learning coefficient is determined), a new value is obtained to determine the final mixing valve opening change rate.

[0125] In this embodiment, when the mixing valve state information, the supercharger state information and the engine state information meet the first preset condition, the EGR rate data, the boost pressure data and the change rate difference data are obtained; when the boost pressure data and the change rate difference data meet the second preset condition, the current learning coefficient is determined based on the throttle gas pressure data and the EGR rate data. The control optimization of the mixing valve opening change rate is achieved based on the intake pressure control stability angle and the EGR rate responsiveness control accuracy.

[0126] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the method for determining the target opening of the mixing valve of the present application. More simple transformations based on this technical concept are all within the scope of protection of the present application.

[0127] The present application also provides a device for determining the target opening of a mixing valve. Figure 5 , the mixing valve target opening determination device comprises:

[0128] A first coefficient determination module 10 is used to obtain throttle gas pressure data and engine speed data, and determine a first correction coefficient of a current change rate and a second correction coefficient of a current change rate based on the throttle gas pressure data and / or the engine speed data;

[0129] A coefficient second determination module 20, for obtaining mixing valve state information, supercharger state information and engine state information, and determining a current learning coefficient based on the mixing valve state information, the supercharger state information and the engine state information;

[0130] A third coefficient determination module 30, configured to determine a change rate multiplication correction coefficient based on the current change rate first correction coefficient, the current change rate second correction coefficient and the current learning coefficient;

[0131] The target opening determination module 40 is used to determine the mixing valve target opening change rate based on the change rate multiplication correction coefficient, and determine the target mixing valve opening based on the mixing valve target opening change rate.

[0132] The device for determining the target opening of a mixing valve provided by the present application adopts the method for determining the target opening of a mixing valve in the above-mentioned embodiment, and can solve the technical problem of how to optimize the rate of change of the mixing valve opening from the perspective of improving the stability of intake pressure control to ensure the control accuracy of the target opening of the mixing valve. Compared with the prior art, the beneficial effects of the device for determining the target opening of a mixing valve provided by the present application are the same as the beneficial effects of the method for determining the target opening of a mixing valve provided by the above-mentioned embodiment, and other technical features in the device for determining the target opening of a mixing valve are the same as the features disclosed in the method in the above-mentioned embodiment, and are not described in detail here.

[0133] In one embodiment, the first coefficient determination module 10 is also used to determine first pressure ratio data and second pressure ratio data based on throttle outlet pressure data and throttle inlet pressure data; determine a first correction coefficient of the current change rate based on the first pressure ratio data and the engine speed data; determine a second correction coefficient of the current change rate based on the second pressure ratio data, and the throttle gas pressure data includes the throttle outlet pressure data and the throttle inlet pressure data.

[0134] In one embodiment, the first coefficient determination module 10 is also used to determine first pressure ratio fluctuation data and engine speed fluctuation data based on the first pressure ratio data and the engine speed fluctuation data; when the first pressure ratio fluctuation data and the engine speed fluctuation data meet the first preset fluctuation condition, obtain the first correction coefficient of the historical change rate, and use the first correction coefficient of the historical change rate as the first correction coefficient of the current change rate.

[0135] In one embodiment, the first coefficient determination module 10 is also used to obtain the current first pressure ratio data based on the first pressure ratio data and the current engine speed data based on the engine speed data when the first pressure ratio fluctuation data and the engine speed fluctuation data do not meet the first preset fluctuation condition; and determine the first correction coefficient of the current change rate based on the current first pressure ratio data and the current engine speed data.

[0136] In one embodiment, the first coefficient determination module 10 is also used to determine second pressure ratio fluctuation data based on the second pressure ratio data; when the second pressure ratio fluctuation data meets the second preset fluctuation condition, obtain the second coefficient for correcting the historical change rate, and use the second coefficient for correcting the historical change rate as the second correction coefficient for the current change rate.

[0137] In one embodiment, the first coefficient determination module 10 is further used to obtain current second pressure ratio data based on the second pressure ratio data when the second pressure ratio fluctuation data meets a second preset fluctuation condition; and determine a second correction coefficient of the current change rate based on the current second pressure ratio data.

[0138] In one embodiment, the second coefficient determination module 20 is also used to obtain EGR rate data, boost pressure data and change rate difference data when the mixing valve status information, the supercharger status information and the engine status information meet the first preset condition; when the boost pressure data and the change rate difference data meet the second preset condition, determine the current learning coefficient based on the throttle gas pressure data and the EGR rate data.

[0139] In one embodiment, the second coefficient determination module 20 is also used to evaluate the intake pressure responsiveness and the EGR rate responsiveness based on the throttle gas pressure data and the EGR rate data when the boost pressure data and the change rate difference data meet the second preset condition, and obtain the intake pressure responsiveness evaluation result and the EGR rate responsiveness evaluation result; and determine the current learning coefficient based on the intake pressure responsiveness evaluation result and the EGR rate responsiveness evaluation result.

[0140] In one embodiment, the second coefficient determination module 20 is also used to determine the learning coefficient increase value based on the EGR rate responsiveness evaluation result when the intake pressure responsiveness evaluation result is that the intake pressure responsiveness meets the preset first response condition, and determine the current learning coefficient based on the learning coefficient increase value; when the intake pressure responsiveness evaluation result is that the intake pressure responsiveness meets the preset second response condition, determine the learning coefficient decrease value based on the EGR rate responsiveness evaluation result, and determine the current learning coefficient based on the learning coefficient decrease value.

[0141] The present application provides a device for determining a target opening of a mixing valve, the device comprising: at least one processor; and a memory connected to the at least one processor in communication; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method for determining the target opening of the mixing valve in the above-mentioned embodiment one.

[0142] Reference below Figure 6, which shows a schematic diagram of the structure of a device for determining the target opening of a mixing valve suitable for implementing the embodiment of the present application. The device for determining the target opening of a mixing valve in the embodiment of the present application may include but is not limited to mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 6 The mixing valve target opening determination device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0143] like Figure 6 As shown, the device for determining the target opening of the mixing valve may include a processing device 1001 (e.g., a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM: Random Access Memory) 1004. Various programs and data required for the operation of the device for determining the target opening of the mixing valve are also stored in the RAM 1004. The processing device 1001, the ROM 1002, and the RAM 1004 are connected to each other via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to the I / O interface 1006: input devices 1007 including, for example, a touch screen, a touchpad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; storage devices 1003 including, for example, a magnetic tape, a hard disk, etc.; and communication devices 1009. The communication device 1009 can allow the mixing valve target opening determination device to communicate wirelessly or wired with other devices to exchange data. Although the mixing valve target opening determination device with various systems is shown in the figure, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems may be implemented or have alternatively.

[0144] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0145] The device for determining the target opening of a mixing valve provided by the present application adopts the method for determining the target opening of a mixing valve in the above-mentioned embodiment, and can solve the technical problem of how to optimize the rate of change of the mixing valve opening from the perspective of improving the stability of intake pressure control to ensure the control accuracy of the target opening of the mixing valve. Compared with the prior art, the beneficial effects of the device for determining the target opening of a mixing valve provided by the present application are the same as the beneficial effects of the method for determining the target opening of a mixing valve provided by the above-mentioned embodiment, and the other technical features of the device for determining the target opening of a mixing valve are the same as the features disclosed in the method of the previous embodiment, and are not described in detail here.

[0146] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0147] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0148] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the method for determining the target opening of a mixing valve in the above-mentioned embodiment.

[0149] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0150] The computer-readable storage medium may be included in the device for determining the target opening of the mixing valve; or may exist independently without being assembled into the device for determining the target opening of the mixing valve.

[0151] The computer-readable storage medium carries one or more programs. When the one or more programs are executed by the mixing valve target opening determination device, the mixing valve target opening determination device: obtains throttle gas pressure data and engine speed data, and determines a first correction coefficient for a current change rate and a second correction coefficient for a current change rate based on the throttle gas pressure data and / or the engine speed data; obtains mixing valve status information, supercharger status information and engine status information, and determines a current learning coefficient based on the mixing valve status information, the supercharger status information and the engine status information; determines a change rate multiplication correction coefficient based on the current first change rate correction coefficient, the current second change rate correction coefficient and the current learning coefficient; determines a mixing valve target opening change rate based on the change rate multiplication correction coefficient, and determines a target mixing valve opening based on the mixing valve target opening change rate.

[0152] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0153] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0154] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0155] The readable storage medium provided by the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned method for determining the target opening of the mixing valve, and can solve the technical problem of how to optimize the rate of change of the mixing valve opening from the perspective of improving the stability of intake pressure control to ensure the control accuracy of the target opening of the mixing valve. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by the present application are the same as the beneficial effects of the method for determining the target opening of the mixing valve provided by the above-mentioned embodiment, and will not be repeated here.

[0156] The present application also provides a computer program product, including a computer program, which implements the steps of the above-mentioned method for determining the target opening of a mixing valve when the computer program is executed by a processor.

[0157] The computer program product provided by the present application can solve the technical problem of how to optimize the mixing valve opening change rate from the perspective of improving the intake pressure control stability to ensure the control accuracy of the mixing valve target opening. Compared with the prior art, the beneficial effects of the computer program product provided by the present application are the same as the beneficial effects of the mixing valve target opening determination method provided by the above embodiment, and will not be elaborated here.

[0158] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A method for determining a target opening of a mixing valve, characterized in that: The method for determining the target opening of the mixing valve comprises: Acquire throttle gas pressure data and engine speed data, and determine a first correction coefficient of a current change rate and a second correction coefficient of a current change rate based on the throttle gas pressure data and / or the engine speed data; Acquiring mixing valve state information, supercharger state information, and engine state information, and determining a current learning coefficient based on the mixing valve state information, the supercharger state information, and the engine state information; determining a change rate multiplication correction coefficient based on the current change rate first correction coefficient, the current change rate second correction coefficient, and the current learning coefficient; A mixing valve target opening degree change rate is determined based on the change rate multiplication correction coefficient, and a target mixing valve opening degree is determined based on the mixing valve target opening degree change rate.

2. The method according to claim 1, characterized in that The throttle gas pressure data includes throttle outlet pressure data and throttle inlet pressure data; The step of determining the first correction coefficient of the current change rate and the second correction coefficient of the current change rate based on the throttle gas pressure data and / or the engine speed data comprises: Determining first pressure ratio data and second pressure ratio data based on the throttle outlet pressure data and the throttle inlet pressure data; determining a first correction coefficient of a current change rate based on the first pressure ratio data and the engine speed data; A second correction coefficient of the current change rate is determined based on the second pressure ratio data.

3. The method according to claim 2, characterized in that The step of determining a first correction coefficient of a current change rate based on the first pressure ratio data and the engine speed data comprises: determining first pressure ratio fluctuation data and engine speed fluctuation data based on the first pressure ratio data and the engine speed data; When the first pressure ratio fluctuation data and the engine speed fluctuation data satisfy a first preset fluctuation condition, a first correction coefficient of a historical change rate is obtained, and the first correction coefficient of the historical change rate is used as a first correction coefficient of a current change rate.

4. The method according to claim 3, characterized in that After the step of obtaining a first correction coefficient of a historical change rate when the first pressure ratio fluctuation data and the engine speed fluctuation data meet a first preset fluctuation condition and using the first correction coefficient of the historical change rate as the first correction coefficient of the current change rate, the method further includes: When the first pressure ratio fluctuation data and the engine speed fluctuation data do not satisfy the first preset fluctuation condition, obtaining current first pressure ratio data based on the first pressure ratio data, and obtaining current engine speed data based on the engine speed data; A current change rate first correction coefficient is determined based on the current first pressure ratio data and the current engine speed data.

5. The method according to claim 2, characterized in that The step of determining a second correction coefficient of the current change rate based on the second pressure ratio data comprises: determining second pressure ratio fluctuation data based on the second pressure ratio data; When the second pressure ratio fluctuation data meets the second preset fluctuation condition, a second correction coefficient of the historical change rate is obtained, and the second correction coefficient of the historical change rate is used as a second correction coefficient of the current change rate.

6. The method according to claim 5, characterized in that After the step of obtaining a second correction coefficient for a historical change rate when the second pressure ratio fluctuation data meets a second preset fluctuation condition and using the second correction coefficient for a historical change rate as a second correction coefficient for a current change rate, the method further includes: When the second pressure ratio fluctuation data does not satisfy the second preset fluctuation condition, acquiring current second pressure ratio data based on the second pressure ratio data; A second correction coefficient of a current change rate is determined based on the current second pressure ratio data.

7. The method according to claim 1, characterized in that The step of determining the current learning coefficient based on the mixing valve state information, the supercharger state information and the engine state information comprises: When the mixing valve state information, the supercharger state information and the engine state information meet a first preset condition, acquiring EGR rate data, boost pressure data and change rate difference data; When the boost pressure data and the change rate difference data satisfy a second preset condition, a current learning coefficient is determined based on the throttle gas pressure data and the EGR rate data.

8. The method according to claim 7, characterized in that The step of determining the current learning coefficient based on the throttle gas pressure data and the EGR rate data when the boost pressure data and the change rate difference data meet the second preset condition comprises: When the boost pressure data and the change rate difference data meet a second preset condition, evaluating intake pressure responsiveness and EGR rate responsiveness based on the throttle gas pressure data and the EGR rate data to obtain intake pressure responsiveness evaluation results and EGR rate responsiveness evaluation results; A current learning coefficient is determined based on the intake pressure responsiveness evaluation result and the EGR rate responsiveness evaluation result.

9. The method according to claim 8, characterized in that The step of determining the current learning coefficient based on the intake pressure responsiveness evaluation result and the EGR rate responsiveness evaluation result comprises: When the intake pressure responsiveness evaluation result is that the intake pressure responsiveness meets the preset first response condition, determining a learning coefficient increase value based on the EGR rate responsiveness evaluation result, and determining a current learning coefficient based on the learning coefficient increase value; When the intake pressure responsiveness evaluation result shows that the intake pressure responsiveness meets the preset second response condition, a learning coefficient reduction value is determined based on the EGR rate responsiveness evaluation result, and a current learning coefficient is determined based on the learning coefficient reduction value.

10. A device for determining a target opening of a mixing valve, characterized in that: The device comprises: a first coefficient determination module, configured to obtain throttle gas pressure data and engine speed data, and determine a first correction coefficient of a current change rate and a second correction coefficient of a current change rate based on the throttle gas pressure data and / or the engine speed data; a coefficient second determination module, configured to obtain mixing valve state information, supercharger state information, and engine state information, and determine a current learning coefficient based on the mixing valve state information, the supercharger state information, and the engine state information; a third coefficient determination module, configured to determine a change rate multiplication correction coefficient based on the current change rate first correction coefficient, the current change rate second correction coefficient, and the current learning coefficient; The target opening determination module is used to determine the mixing valve target opening change rate based on the change rate multiplication correction coefficient, and determine the target mixing valve opening based on the mixing valve target opening change rate.

11. A device for determining a target opening of a mixing valve, characterized in that: The device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the method for determining a target opening degree of a mixing valve according to any one of claims 1 to 9.

12. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the method for determining the target opening of a mixing valve according to any one of claims 1 to 9 are implemented.

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