Control methods, devices, equipment, and storage media for the process of a mixing valve changing from fully open to partially open.

Abstract

This application discloses a control method, device, equipment, and storage medium for a mixing valve transitioning from fully open to partially open, relating to the field of engine control technology. The method involves obtaining the initial mixing valve opening change rate under the current transition condition from fully open to partially open; determining a first multiplication correction coefficient based on the actual gas pressure after the throttle and the target gas pressure after the throttle, and the actual gas pressure before the throttle; determining a second multiplication correction coefficient based on the maximum boost capacity, minimum boost capacity, and actual boost capacity; determining a third multiplication correction coefficient based on the ignition angle efficiency; obtaining the target mixing valve opening change rate based on the initial mixing valve opening change rate, the first multiplication correction coefficient, the second multiplication correction coefficient, the third multiplication correction coefficient, and the learning update coefficient; and controlling the mixing valve based on the target mixing valve opening and the target mixing valve opening change rate to optimize the control of the mixing valve opening change rate.

Description

Technical Field

[0001] This application relates to the field of engine control technology, and in particular to control methods, devices, equipment and storage media for the process of a mixing valve changing from fully open to partially open. Background Technology

[0002] Exhaust gas recirculation (EGR) draws exhaust gas from the exhaust system and introduces it into the intake system. Studies have shown that EGR systems have certain advantages in improving emissions, reducing fuel consumption, and improving anti-knock capabilities. In low-pressure EGR systems, the control of the mixing valve is particularly important for improving the EGR rate. Currently, the basic target EGR rate is determined based on engine speed and load, and corresponding correction rates are obtained based on specific operating conditions. An initial target EGR rate is then determined based on the basic target EGR rate and the correction rates. The activation status of EGR is then determined based on the EGR activation conditions, and the EGR state is classified according to the determination results to determine the final target EGR rate. The initial target EGR rate is calculated from throttle opening, manifold differential pressure, and minimum ignition angle, but precise control of the mixing valve's target opening is not possible.

[0003] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The main objective of this application is to provide a control method, device, equipment, and storage medium for the process of a mixing valve changing from fully open to partially open, aiming to solve the technical problem that the existing technology cannot accurately control the target opening degree of the mixing valve when controlling the opening degree of the mixing valve.

[0005] To achieve the above objectives, this application proposes a control method for a mixing valve during the process of switching from fully open to partially open, the control method comprising:

[0006] Obtain the initial rate of change of the mixing valve opening when the mixing valve is in the transition condition from fully open to partially open;

[0007] Based on the actual gas pressure after the throttle and the target gas pressure after the throttle, the first correction factor for multiplication is determined by the actual gas pressure after the throttle and the actual gas pressure before the throttle.

[0008] The second correction coefficient for multiplication is determined based on the maximum boost capacity, minimum boost capacity, and actual boost capacity.

[0009] The third correction coefficient for multiplication is determined based on the ignition angle efficiency;

[0010] The target mixing valve opening change rate is obtained based on the initial mixing valve opening change rate, the first multiplication correction coefficient, the second multiplication correction coefficient, the third multiplication correction coefficient, and the learning update coefficient. The mixing valve is then controlled based on the target mixing valve opening and the target mixing valve opening change rate.

[0011] In one embodiment, the step of determining the multiplication first correction coefficient based on the actual gas pressure after the throttle and the target gas pressure after the throttle, and the actual gas pressure before the throttle, includes:

[0012] The first pressure ratio is obtained based on the actual gas pressure after the throttle and the target gas pressure after the throttle.

[0013] The second pressure ratio is obtained based on the actual gas pressure after the throttle and the actual gas pressure before the throttle.

[0014] The steps include determining the current engine speed and obtaining a first correction coefficient based on the first pressure ratio and the current engine speed;

[0015] The second correction factor is obtained based on the second pressure ratio;

[0016] The first correction factor for multiplication is determined based on the first correction factor and the second correction factor.

[0017] In one embodiment, the step of determining the current engine speed and obtaining a first correction coefficient based on the first pressure ratio and the current engine speed includes:

[0018] Determine the engine speed in the current sampling period and the engine speed in the previous sampling period, and obtain the engine speed fluctuation based on the engine speed in the current sampling period and the engine speed in the previous sampling period;

[0019] Determine the first pressure ratio under the current sampling period and the first pressure ratio under the previous sampling period, and obtain the first pressure fluctuation based on the first pressure ratio under the current sampling period and the first pressure ratio under the previous sampling period;

[0020] When the engine speed fluctuation does not exceed a preset speed fluctuation value and the first pressure fluctuation does not exceed a preset first pressure fluctuation value, the first correction coefficient is maintained; otherwise, the first correction coefficient is obtained based on the ratio of the current engine speed to the first pressure.

[0021] In one embodiment, the step of obtaining the second correction coefficient based on the second pressure ratio includes:

[0022] Obtain the second pressure ratio in the current sampling period and the second pressure ratio in the previous sampling period;

[0023] The second pressure fluctuation is obtained based on the second pressure ratio under the current sampling period and the second pressure ratio under the previous sampling period;

[0024] When the second pressure fluctuation does not exceed the preset second pressure fluctuation value, the second correction coefficient is maintained; otherwise, the second correction coefficient is obtained based on the second pressure ratio.

[0025] In one embodiment, the step of determining the second multiplication correction coefficient based on the maximum boost capacity, minimum boost capacity, and actual boost capacity includes:

[0026] The first boost ratio is obtained based on the target boost ratio and the maximum boost ratio.

[0027] When the first boost ratio is greater than the first preset value, the multiplication second correction coefficient is set to the first preset multiplication second correction coefficient;

[0028] The second boost ratio is obtained based on the target boost ratio and the minimum boost ratio.

[0029] When the second boost ratio is less than the second preset value, the multiplication second correction coefficient is set to the second preset multiplication second correction coefficient;

[0030] The third boost capacity ratio is obtained based on the actual boost capacity and the target boost capacity.

[0031] When the first boost ratio is less than a first preset value, or when the second boost ratio is greater than a second preset value, wherein the first preset value is less than the second preset value.

[0032] The second correction factor is determined based on the current engine speed, the first boost ratio, the second boost ratio, and the third boost ratio.

[0033] In one embodiment, after the step of setting the multiplication second correction coefficient to the first preset multiplication second correction coefficient when the first boost ratio is greater than the first preset value, the method further includes:

[0034] Determine the difference between the target boost pressure and the actual boost pressure;

[0035] Determine the fluctuation range of the target boost pressure and the fluctuation range of the actual boost pressure;

[0036] When the difference is within a preset pressure range, the fluctuation range of the target boost pressure is within a preset fluctuation range, and the fluctuation range of the actual boost pressure is within the preset fluctuation range, the lock-in time is determined based on the actual boost pressure, the target boost pressure, and the engine speed.

[0037] In one embodiment, the step of determining the third multiplication correction coefficient based on the ignition angle efficiency includes:

[0038] Determine the ignition angle efficiency in the current sampling period and the ignition angle efficiency in the previous sampling period;

[0039] The change in ignition angle efficiency is obtained based on the ignition angle efficiency in the current sampling period and the ignition angle efficiency in the previous sampling period.

[0040] When the change in ignition angle efficiency is lower than the first preset change in ignition angle efficiency, the third multiplication correction coefficient is set to the first preset third multiplication correction coefficient.

[0041] When the change in ignition angle efficiency is not less than the second preset change in ignition angle efficiency, the angle difference between the engine knock retardation angle and the maximum permissible retardation angle is determined, and the retardation angle ratio is obtained based on the angle difference and the maximum permissible retardation angle, wherein the first preset change in ignition angle efficiency is less than the second preset ignition angle efficiency ratio.

[0042] The intake density ratio is obtained by determining the engine's current actual intake density and its maximum intake density.

[0043] When the angle difference is not less than the preset angle difference and the intake density ratio does not exceed the preset intake density ratio, the multiplication third correction coefficient is set to the second preset multiplication third correction coefficient;

[0044] Otherwise, the third correction factor of the multiplication is determined based on the ratio of the change in ignition angle efficiency to the basic ignition angle efficiency, the engine speed, the retarding angle ratio, and the intake air density ratio.

[0045] In one embodiment, the step of obtaining the target mixing valve opening change rate based on the initial mixing valve opening change rate, the first multiplication correction coefficient, the second multiplication correction coefficient, the third multiplication correction coefficient, and the learning update coefficient, and controlling the mixing valve based on the target mixing valve opening and the target mixing valve opening change rate includes:

[0046] The target mixing valve opening change rate is obtained by multiplying the initial mixing valve opening change rate, the first multiplication correction coefficient, the second multiplication correction coefficient, the third multiplication correction coefficient, and the learning update coefficient.

[0047] The mixing valve is controlled based on the target opening degree of the mixing valve and the rate of change of the target mixing valve opening degree.

[0048] In one embodiment, before the step of obtaining the initial mixing valve opening change rate under the current mixing valve transition condition from fully open to partially open, the method further includes:

[0049] Determine the state of the booster when the mixing valve is in the transition condition from fully open to partially open;

[0050] When the turbocharger is in the closed-loop control active state, the target intake pressure change rate of the engine and the requested torque change rate of the engine are determined.

[0051] When the engine target intake pressure change rate is greater than the preset intake pressure change rate and the engine requested torque change rate is greater than the preset engine requested torque change rate, it is determined that the engine mileage corresponding to the learning coefficient has not been updated.

[0052] When the mileage is greater than the preset mileage, the step of obtaining the initial mixing valve opening change rate under the current mixing valve transition condition from fully open to partially open is executed.

[0053] Furthermore, to achieve the above objectives, this application also proposes a control device for the process of a mixing valve changing from fully open to partially open, the control device comprising:

[0054] The operating condition confirmation module is used to obtain the initial rate of change of the mixing valve opening when the mixing valve is in the transition condition from fully open to partially open.

[0055] The first correction module is used to determine the multiplication first correction coefficient based on the actual gas pressure after the throttle and the target gas pressure after the throttle, and the actual gas pressure after the throttle and the actual gas pressure before the throttle.

[0056] The second correction module is used to determine the multiplicative second correction coefficient based on the maximum boost capacity, minimum boost capacity and actual boost capacity;

[0057] The third correction module is used to determine the multiplicative third correction coefficient based on the ignition angle efficiency;

[0058] The mixing valve control module is used to obtain the target mixing valve opening change rate based on the initial mixing valve opening change rate, the multiplication first correction coefficient, the multiplication second correction coefficient, the multiplication third correction coefficient, and the learning update coefficient, and to control the mixing valve based on the target mixing valve opening and the target mixing valve opening change rate.

[0059] Furthermore, to achieve the above objectives, this application also proposes a control device for the process of a mixing valve changing from fully open to partially open. The device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. The computer program is configured to implement the steps of the control method for the process of a mixing valve changing from fully open to partially open as described above.

[0060] In addition, to achieve the above objectives, this application also proposes a storage medium, which is a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the steps of the control method for the mixing valve during the process from fully open to partially open as described above.

[0061] In addition, to achieve the above objectives, this application also provides a computer program product, which includes a computer program that, when executed by a processor, implements the steps of the control method for the mixing valve during the process from fully open to partially open as described above.

[0062] One or more technical solutions proposed in this application have at least the following technical effects: by obtaining the initial mixing valve opening change rate under the current transition condition from fully open to partially open, determining a multiplication first correction coefficient based on the actual gas pressure after the throttle and the target gas pressure after the throttle, and the actual gas pressure before the throttle, determining a multiplication second correction coefficient based on the maximum boost capacity, minimum boost capacity, and actual boost capacity, determining a multiplication third correction coefficient based on the ignition angle efficiency, obtaining the target mixing valve opening change rate based on the initial mixing valve opening change rate, the multiplication first correction coefficient, the multiplication second correction coefficient, the multiplication third correction coefficient, and the learning update coefficient, controlling the mixing valve based on the target mixing valve opening and the target mixing valve opening change rate, and optimizing the control of the mixing valve opening change rate. Attached Figure Description

[0063] 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.

[0064] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0065] Figure 1 A flowchart illustrating an embodiment of the control method for the mixing valve during the process of switching from fully open to partially open according to this application;

[0066] Figure 2 A schematic diagram of a low-pressure EGR system architecture provided in an embodiment of the control method for the mixing valve during the process from fully open to partially open according to this application;

[0067] Figure 3 A flowchart of a control method provided in an embodiment of the control method for the mixing valve during the process of switching from fully open to partially open according to this application;

[0068] Figure 4 This is a schematic diagram of the module structure of the control device for the mixing valve during the process of switching from fully open to partially open according to an embodiment of this application;

[0069] Figure 5 This is a schematic diagram of the hardware operating environment involved in the control method of the mixing valve during the process of switching from fully open to partially open in the embodiments of this application.

[0070] The purpose, features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0071] It should be understood that the specific embodiments described herein are merely used to explain the technical solutions of the present application and are not intended to limit the present application.

[0072] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0073] The main solution of this application embodiment is as follows: Obtain the initial mixing valve opening change rate under the transition condition from fully open to partially open; determine a multiplication first correction coefficient based on the actual gas pressure after the throttle and the target gas pressure after the throttle, and the actual gas pressure before the throttle; determine a multiplication second correction coefficient based on the maximum boost capacity, minimum boost capacity, and actual boost capacity; determine a multiplication third correction coefficient based on the ignition angle efficiency; obtain the target mixing valve opening change rate based on the initial mixing valve opening change rate, the first multiplication correction coefficient, the second multiplication correction coefficient, the third multiplication correction coefficient, and the learning update coefficient; and control the mixing valve based on the target mixing valve opening and the target mixing valve opening change rate.

[0074] In this embodiment, for ease of description, the following description focuses on the control device that identifies the process of the mixing valve changing from fully open to partially open.

[0075] Because existing technology determines the basic target EGR rate based on engine speed and load, obtains the corresponding correction rate based on special operating conditions, determines the initial target EGR rate based on the basic target EGR rate and each correction rate, judges whether EGR is activated based on the EGR activation state conditions, classifies the EGR state based on the judgment result, and determines the final target EGR rate, the initial target EGR rate is calculated from throttle opening, manifold pressure difference and minimum ignition angle, it cannot accurately control the target opening of the mixing valve.

[0076] This application provides a solution that optimizes the rate of change of the opening of the mixing valve based on the stability of the mixing valve control, the need to improve engine power performance, the stability of intake pressure and boost pressure control, engine safety protection, and the accuracy of EGR rate control.

[0077] As can be seen from the above embodiments, this application obtains the initial mixing valve opening change rate under the current mixing valve's transition condition from fully open to partially open, determines a multiplication first correction coefficient based on the actual gas pressure after the throttle and the target gas pressure after the throttle, and the actual gas pressure before the throttle and the actual gas pressure after the throttle, determines a multiplication second correction coefficient based on the maximum boost capacity, minimum boost capacity, and actual boost capacity, determines a multiplication third correction coefficient based on the ignition angle efficiency, obtains the target mixing valve opening change rate based on the initial mixing valve opening change rate, the multiplication first correction coefficient, the multiplication second correction coefficient, the multiplication third correction coefficient, and the learning update coefficient, controls the mixing valve based on the target mixing valve opening and the target mixing valve opening change rate, and optimizes the control of the mixing valve opening change rate.

[0078] It should be noted that the executing entity in this embodiment can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, or mobile phone, or an electronic device capable of performing the above functions, such as a control device for the mixing valve during the process of changing from fully open to partially open. The following description uses a control device for the mixing valve during the process of changing from fully open to partially open as an example to illustrate this embodiment and the subsequent embodiments.

[0079] Based on this, embodiments of this application provide a control method for a mixing valve during the process of changing from fully open to partially open, referring to... Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the control method for the mixing valve during the process of switching from fully open to partially open according to this application.

[0080] In this embodiment, the control method for the mixing valve during the process from fully open to partially open includes steps S10 to S50:

[0081] Step S10: Obtain the initial mixing valve opening change rate under the current transition condition from fully open to partially open.

[0082] It should be noted that the low-pressure EGR system includes an air filter, mixing valve, turbocharger compressor, throttle body, engine, turbocharger turbine, catalytic converter, particulate filter, EGR cooler, EGR valve, EGR temperature sensor, EGR differential pressure sensor, flow meter, and linear oxygen sensor. (Refer to...) Figure 2 , Figure 2This is a schematic diagram of a low-pressure EGR system architecture. The turbocharger compressor compresses fresh air for boost; the turbocharger turbine controls the turbine's efficiency by adjusting the opening of the turbocharger's exhaust bypass valve, thus achieving different boost capacities. Compared to a non-low-pressure EGR system, the low-pressure EGR system adds the following components: an EGR cooler, an EGR temperature sensor, an EGR valve, an EGR differential pressure sensor, a mixing valve, a flow meter, and an oxygen sensor. The flow meter is installed between the air filter and the mixing valve to detect the flow rate of fresh air entering the engine; the mixing valve regulates the pressure at the EGR valve outlet, increasing the pressure differential across the EGR valve and improving the EGR rate; the oxygen sensor is installed between the compressor and the throttle valve, near the throttle valve, to detect the flow rate of the air-fuel mixture entering the cylinder; the EGR cooler cools the exhaust gas, facilitating increased exhaust gas flow and reduced exhaust gas temperature; the EGR valve throttles the exhaust gas flow into the cylinder; the EGR temperature sensor detects the temperature of the exhaust gas entering the EGR valve; and the EGR differential pressure sensor detects the pressure at the EGR inlet and outlet.

[0083] It should be noted that the mixing valve opening degree refers to the extent to which the mixing valve is open. The larger the opening degree, the greater the gas flow rate. The initial mixing valve opening degree change rate refers to the degree of change in the mixing valve opening degree before control optimization begins, and is used to reflect the rate at which the mixing valve opens or closes. The transition condition from fully open to partially open refers to the process of the mixing valve changing from an inactive state to an active state.

[0084] In the specific implementation, the current operating condition of the mixing valve is determined. When the current operating condition is in the transition state from fully open to partially open, the current opening degree of the mixing valve can be obtained. and the rate of change of the initial mixing valve opening .

[0085] Step S20: Based on the actual gas pressure after the throttle and the target gas pressure after the throttle, determine the first correction coefficient for multiplication between the actual gas pressure after the throttle and the actual gas pressure before the throttle.

[0086] It should be noted that the terms "before the throttle" and "after the throttle" are determined based on the direction of gas flow towards the throttle. Gas flows from before the throttle, through the throttle, to after the throttle. The first correction factor refers to the first control factor of the mixing valve used for control.

[0087] In practical implementation, it is based on the actual gas pressure after the throttle valve. and target gas pressure after throttle valve ratio Actual gas pressure after throttle body and actual gas pressure before throttle body ratio Determine the first correction factor for multiplication. .

[0088] In one feasible implementation, the step of determining the multiplication first correction coefficient based on the actual gas pressure after the throttle and the target gas pressure after the throttle, and the actual gas pressure after the throttle and the actual gas pressure before the throttle, includes:

[0089] The first pressure ratio is obtained based on the actual gas pressure after the throttle and the target gas pressure after the throttle.

[0090] The second pressure ratio is obtained based on the actual gas pressure after the throttle and the actual gas pressure before the throttle.

[0091] The steps include determining the current engine speed and obtaining a first correction coefficient based on the first pressure ratio and the current engine speed;

[0092] The second correction factor is obtained based on the second pressure ratio;

[0093] The first correction factor for multiplication is determined based on the first correction factor and the second correction factor.

[0094] It should be noted that the first pressure ratio is the ratio of the actual gas pressure after the throttle to the target gas pressure after the throttle, and the second pressure ratio is the ratio of the actual gas pressure before the throttle to the target gas pressure before the throttle. The first correction coefficient and the second correction coefficient are both parameters that correct the multiplication of the first correction coefficient. The first correction coefficient is obtained by the first pressure ratio and the current engine speed, and the second correction coefficient is obtained by the second pressure ratio.

[0095] In practical implementation, the first correction coefficient of the multiplication can be... Represented as:

[0096]

[0097] in, Based on The first correction factor is determined by the engine speed n. Based on The determined second correction factor.

[0098] In pressure ratio The smaller the value, the slower the intake pressure control response. To improve intake pressure control accuracy, it is necessary to reduce the rate of change of the mixing valve opening, thereby increasing the gas flow into the turbocharger compressor, increasing the throttle inlet pressure, and increasing the actual intake pressure; in terms of pressure ratio... If the value is too high, it indicates that the intake pressure control response is too fast. To improve the accuracy of intake pressure control, the rate of change of the mixing valve opening is increased, thereby reducing the gas flow entering the turbocharger compressor as quickly as possible, reducing the throttle inlet pressure, and thus reducing the actual intake pressure. This example demonstrates this at different engine speeds n. The value is 1, and different pressure ratios are adjusted. Get This ensures 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 ±3 kPa for more than 0.5 seconds continuously.

[0099] In one feasible implementation, the step of determining the current engine speed and obtaining a first correction coefficient based on the first pressure ratio and the current engine speed includes:

[0100] Determine the engine speed in the current sampling period and the engine speed in the previous sampling period, and obtain the engine speed fluctuation based on the engine speed in the current sampling period and the engine speed in the previous sampling period;

[0101] Determine the first pressure ratio under the current sampling period and the first pressure ratio under the previous sampling period, and obtain the first pressure fluctuation based on the first pressure ratio under the current sampling period and the first pressure ratio under the previous sampling period;

[0102] When the engine speed fluctuation does not exceed a preset speed fluctuation value and the first pressure fluctuation does not exceed a preset first pressure fluctuation value, the first correction coefficient is maintained; otherwise, the first correction coefficient is obtained based on the ratio of the current engine speed to the first pressure.

[0103] It should be noted that the first pressure fluctuation refers to the difference between the first pressure ratio in the current sampling period and the first pressure ratio in the previous sampling period.

[0104] In the specific implementation, to avoid engine speed n and Too frequent fluctuations lead to Excessive adjustments leading to large changes in the correction coefficient r1 can cause excessive fluctuations in the mixing valve opening control, resulting in poor mixing valve control stability. This can be addressed by:

[0105] 1) The engine speed fluctuation n (the difference between the engine speed in the current sampling period and the engine speed in the previous sampling period, with a sampling period of 10ms in this example) does not exceed the preset value (±40rpm in this example) and,

[0106] 2) In Fluctuation (pressure ratio during this sampling period) Pressure ratio compared to the previous sampling period The difference (with a sampling period of 10ms in this example) does not exceed a preset value (±0.1 in this example); when all of the above conditions are met, the correction coefficient is... No updates.

[0107] After calibration Afterwards, through adjustments Determine In pressure ratio The larger the value, the smaller the pressure difference between the throttle inlet and outlet. This necessitates reducing the rate of change of the mixing valve opening to mitigate the impact of intake pressure reduction by slowing the decrease in throttle inlet pressure. Similarly, it ensures that the difference between the actual and target intake pressure does not exceed ±3 kPa for more than 0.5 seconds during the transition from fully open to partially open mixing valve. Specifically, in... When it is 1, The value is 0, mainly because the parameter of the ratio of throttle outlet pressure to inlet pressure is only adjusted when the throttle inlet pressure response is poor. Otherwise, no adjustment is needed to avoid affecting the accuracy of the EGR rate response (ensuring that the continuous time when the difference between the target EGR rate and the actual EGR rate exceeds the preset value ±0.15 does not exceed 0.3s).

[0108] In one feasible implementation, the step of obtaining the second correction coefficient based on the second pressure ratio includes:

[0109] Obtain the second pressure ratio in the current sampling period and the second pressure ratio in the previous sampling period;

[0110] The second pressure fluctuation is obtained based on the second pressure ratio under the current sampling period and the second pressure ratio under the previous sampling period;

[0111] When the second pressure fluctuation does not exceed the preset second pressure fluctuation value, the second correction coefficient is maintained; otherwise, the second correction coefficient is obtained based on the second pressure ratio.

[0112] It should be noted that the second pressure fluctuation refers to the difference between the second pressure ratio and the second pressure ratio in the previous sampling period.

[0113] In specific implementations, to avoid Too frequent fluctuations lead to If the adjustment is too large, causing the correction coefficient r1 to change too much, resulting in excessive fluctuations in the opening control of the mixing valve and poor control stability, the following measures will be taken:

[0114] exist Fluctuation (pressure ratio during this sampling period) Pressure ratio compared to the previous sampling period When the sampling period (10ms in this example) does not exceed the preset value (±0.03 in this example), the correction coefficient is... No updates.

[0115] Step S30: Determine the second correction coefficient for multiplication based on the maximum boost capacity, minimum boost capacity, and actual boost capacity.

[0116] It should be noted that the second correction factor of the multiplication refers to the second control factor of the mixing valve used for control.

[0117] In practice, the multiplication correction factor two is determined based on the maximum boost pressure, minimum boost pressure, current target boost pressure, and actual boost pressure. And the locking time t1, where the locking time t1 refers to the time to maintain the current opening degree of the mixing valve unchanged. After the locking time t1 ends, based on the multiplication correction coefficient two Correct the rate of change of the mixing valve opening.

[0118] In one feasible implementation, the step of determining the multiplicative second correction coefficient based on the maximum boost capacity, minimum boost capacity, and actual boost capacity includes:

[0119] The first boost ratio is obtained based on the target boost ratio and the maximum boost ratio.

[0120] When the first boost ratio is greater than the first preset value, the multiplication second correction coefficient is set to the first preset multiplication second correction coefficient;

[0121] The second boost ratio is obtained based on the target boost ratio and the minimum boost ratio.

[0122] When the second boost ratio is less than the second preset value, the multiplication second correction coefficient is set to the second preset multiplication second correction coefficient;

[0123] The third boost capacity ratio is obtained based on the actual boost capacity and the target boost capacity.

[0124] When the first boost ratio is less than a first preset value, or when the second boost ratio is greater than a second preset value, wherein the first preset value is less than the second preset value.

[0125] The second correction factor is determined based on the current engine speed, the first boost ratio, the second boost ratio, and the third boost ratio.

[0126] It should be noted that the first preset multiplication second correction coefficient and the second preset multiplication second correction coefficient are both fixed correction coefficients that are preset and their specific values ​​are obtained through actual vehicle testing. The first preset value and the second preset value are preset values ​​used to determine the first boost ratio and the second boost ratio, wherein the first preset value is less than the second preset value.

[0127] In practical implementation, it depends on the target boosting capacity. With maximum boost capacity Obtain the first boost capacity ratio The ratio of the current target boost capacity to the maximum boost capacity. If the value is greater than the first preset value, which is 0.95 in this example, then the locking time t1 depends on the value of the first preset value. Simultaneously, the correction coefficient r2 for the target opening change rate of the mixing valve is set to 1 to meet the boost capacity requirements, achieve boost control stability, and meet the vehicle's power requirements. This is the actual boost pressure. The calibration method is:

[0128] 1) Ensure that the difference between the target boost pressure and the actual boost pressure is controlled within ±2 kPa.

[0129] 2) At the same time, when the target boost pressure fluctuation range is ±2kPa, the actual boost pressure fluctuation range is also within ±2kPa.

[0130] The ratio of the current target boost capacity to the minimum boost capacity If the value is less than the preset value, and in this example it is 1.02, then the locking time t1 is 0, and the correction coefficient r2 for the target opening change rate of the mixing valve is set to 1.15; in order to quickly reduce the boost pressure, thereby improving the vehicle's power performance.

[0131] In other cases, t1 equals 0, and

[0132]

[0133] in, Based on The correction factor is determined by the engine speed n. Based on Determined correction factor Based on Determined correction factor.

[0134] In pressure ratio The smaller the value, the slower the boost pressure control response. To improve boost pressure control accuracy, it is necessary to reduce the rate of change of the mixing valve opening, thereby increasing the gas flow rate entering the booster compressor, improving the boost capacity, and thus increasing the actual boost pressure. In terms of pressure ratio... If the value is too high, it indicates that the boost pressure control response is too fast. To improve the boost pressure control accuracy, the rate of change of the mixing valve opening is increased, thereby reducing the gas flow entering the turbocharger compressor as quickly as possible, reducing the boost capacity, and thus reducing the actual boost pressure. This example demonstrates different engine speeds n. No greater than 0.5 When the pressure ratio is not less than 1.2, different pressure ratios can be adjusted. Get To ensure that the difference between the target boost pressure and the actual boost pressure is controlled within ±2 kPa for no more than 0.5 s during the transition from fully open to partially open mixing valve, the continuous time should not exceed 0.5 s.

[0135] Similarly, to avoid engine speed n and Too frequent fluctuations lead to If the adjustment is too large, causing the correction coefficient r2 to change too much, resulting in excessive fluctuations in the opening control of the mixing valve and poor control stability, the following measures will be taken:

[0136] If the engine speed fluctuation (n) (the difference between the engine speed in the current sampling period and the engine speed in the previous sampling period, with a sampling period of 10ms in this example) does not exceed the preset value (±40rpm in this example) and Fluctuation (pressure ratio during this sampling period) Pressure ratio compared to the previous sampling period If the difference between the two sampling periods (10ms in this example) does not exceed the preset value (±0.15 in this example), the correction coefficient r2 will not be updated.

[0137] After calibration Then, by fixing different engine speeds n, the test was conducted when...

[0138] Greater than 0.5 and not greater than 0.95 When it is not less than 1.2, adjust. Determine This ensures that the difference between the target boost pressure and the actual boost pressure is controlled within ±2 kPa for no more than 0.5 s during the transition from fully open to partially open mixing valve.

[0139] After calibration and Then, by fixing different engine speeds n, the test was conducted when... No greater than 0.5 When the value is less than 1.2 and not less than 1.02, adjust. Determine This ensures that the difference between the target boost pressure and the actual boost pressure is controlled within ±2 kPa for no more than 0.5 s during the transition from fully open to partially open mixing valve.

[0140] Step S40: Determine the third correction coefficient for multiplication based on the ignition angle efficiency.

[0141] It should be noted that the third correction factor of the multiplication refers to the third control factor of the mixing valve used for control.

[0142] In specific implementation, the ignition angle efficiency under the current sampling period and the ignition angle efficiency under the previous sampling period are determined; the change in ignition angle efficiency is obtained based on the ignition angle efficiency under the current sampling period and the ignition angle efficiency under the previous sampling period; when the change in ignition angle efficiency is lower than the first preset change in ignition angle efficiency, the third correction coefficient of the multiplication is set to the first preset third correction coefficient of the multiplication; when the change in ignition angle efficiency is not lower than the second preset change in ignition angle efficiency, the angle difference between the engine knock retardation angle and the maximum allowable retardation angle is determined, and the change in ignition angle efficiency is determined based on the angle difference and the maximum allowable retardation angle. The maximum permissible retardation angle is used to obtain the retardation angle ratio, wherein the change in efficiency of the first preset ignition angle is less than the second preset ignition angle efficiency ratio; the current actual intake air density and the maximum intake air density of the engine are determined to obtain the intake air density ratio; when the angle difference is not less than the preset angle difference and the intake air density ratio does not exceed the preset intake air density ratio, the multiplication third correction coefficient is set to the second preset multiplication third correction coefficient; otherwise, the multiplication third correction coefficient is determined based on the ignition angle efficiency ratio of the change in ignition angle efficiency and the basic ignition angle efficiency, the engine speed, the retardation angle ratio, and the intake air density ratio. Specifically, it can be:

[0143] If the change in ignition angle efficiency (the difference between the ignition angle efficiency in the current sampling period and the ignition angle efficiency in the previous sampling period, with the sampling period set to 10ms in this example) is lower than the first preset change in ignition angle efficiency, which is set to -0.2 in this example, then... At this point, the power requirement is not high, and the priority is to ensure the stability of the mixing valve opening control.

[0144] If both conditions are met:

[0145] i) Change in ignition angle efficiency Not lower than the preset value; in this example, it is set to 0.25.

[0146] ii) Engine knock retardation angle and maximum permissible retardation angle (This example uses 10° to ensure that the knock delay angle is not too large, which could lead to excessive loss of engine power.) and with the maximum permissible delay angle ratio It should not be less than the preset value; in this example, it is -0.6.

[0147] iii) Current actual intake air density of the engine With maximum intake density ratio The value should not exceed the preset value; in this example, it is set to 0.92. Therefore, r3 = 0 to meet the power requirements.

[0148] In other cases, optimizations are made from the perspectives of improving power control, mitigating the effects of engine knock, and enhancing the control accuracy of the mixing valve.

[0149]

[0150] in, Based on the change in ignition angle efficiency Compared with basic ignition angle efficiency The ratio of ignition angle efficiency to ignition angle efficiency The correction factor is determined by the engine speed n. Based on Determined correction factor Based on Determined correction factor.

[0151] ignition angle efficiency ratio The smaller the value, the smaller the change in ignition angle efficiency requirement, and therefore the smaller the increase in power requirement. In this case, response mixing valve opening control can be prioritized, so the larger the correction coefficient r3, the better. When the value is too large, it indicates a greater change in ignition angle efficiency requirements, thus leading to a greater increase in power demand. In this case, prioritizing power demand should be considered, therefore the smaller the correction coefficient r3, the better. This example demonstrates different engine speeds n... -1, When the efficiency ratio is not less than 0.95, it can be adjusted by changing the ignition angle. Get This ensures that the difference between the engine's target torque and actual torque is controlled within ±5 Nm for no more than 0.5 seconds during the transition from fully open to partially open mixing valve.

[0152] Similarly, to avoid the ratio of engine speed n to ignition angle efficiency... Too frequent fluctuations lead to If the adjustment is too large, causing the correction coefficient r3 to change too much, resulting in excessive fluctuations in the opening control of the mixing valve and poor control stability, the following measures will be taken:

[0153] If the engine speed fluctuation (n) (the difference between the engine speed in the current sampling period and the engine speed in the previous sampling period, with a sampling period of 10ms in this example) does not exceed the preset value (±40rpm in this example) and the ignition angle efficiency ratio is... Fluctuation (Ignition angle efficiency ratio in this sampling period) Compared with the ignition angle efficiency in the previous sampling period When the sampling period (10ms in this example) does not exceed the preset value (±0.08 in this example), the correction coefficient r3 will not be updated.

[0154] After calibration Then, by fixing different engine speeds n, tests were conducted.

[0155] When it is not less than 0.95, adjust. Determine This ensures that the difference between the engine's target torque and actual torque is controlled within ±5 Nm for no more than 0.5 s during the transition from fully open to partially open mixing valve.

[0156] After calibration and Then, by fixing different engine speeds n, the test was conducted when... -1, adjust Determine This ensures that the difference between the engine's target torque and actual torque is controlled within ±5 Nm for no more than 0.5 s during the transition from fully open to partially open mixing valve.

[0157] Step S50: Obtain the target mixing valve opening change rate based on the initial mixing valve opening change rate, the first multiplication correction coefficient, the second multiplication correction coefficient, the third multiplication correction coefficient, and the learning update coefficient; and control the mixing valve based on the target mixing valve opening and the target mixing valve opening change rate.

[0158] In the specific implementation, the initial mixing valve opening change rate, the first multiplication correction coefficient, the second multiplication correction coefficient, the third multiplication correction coefficient, and the learning update coefficient are multiplied together to obtain the target mixing valve opening change rate; the mixing valve is controlled based on the target mixing valve opening and the target mixing valve opening change rate. During the transition from fully open to partially open mixing valve, the final mixing valve opening change rate is... :

[0159] ,in The learning and updating coefficients are set to 0 by default and can be saved after the vehicle is powered off.

[0160] Among them, the learning coefficient The purpose of the update is to improve the dynamic responsiveness and EGR rate response accuracy during the control process. The update method can only be activated when the following conditions are met simultaneously (the engine is under large transient conditions):

[0161] 1) The mixing valve is in the transition process from fully open to partially open.

[0162] 2) The turbocharger is in closed-loop control active state.

[0163] 3) The absolute value of the engine target intake pressure change rate exceeds the preset value, which is 25 kPa / 10 ms in this example.

[0164] 4) The absolute value of the engine's requested torque change rate exceeds the preset value, which is 30 Nm / 10 ms in this example.

[0165] 5) The engine mileage corresponding to the learning coefficient not being updated exceeds the preset value. In this example, it is set to 20,000 kilometers.

[0166] If all of the above conditions are met, then determine:

[0167] In the first scenario, torque response is poor, but EGR rate response is good:

[0168] 1) The time during which the difference between the engine's target torque and actual torque exceeds ±5 Nm exceeds 0.7 s;

[0169] 2) The difference between the target EGR rate and the actual EGR rate shall not exceed the preset value ±0.1;

[0170] 3) The ratio does not exceed the preset value; in this example, it is -15% / 10ms.

[0171] This necessitates further improvement in torque response accuracy.

[0172] ,in This is the self-learning correction coefficient obtained from the previous learning.

[0173] In the second scenario, the torque response is good, but the EGR rate response is poor.

[0174] 1) The continuous time during which the difference between the engine's target torque and actual torque exceeds ±5 Nm shall not exceed 0.5 s;

[0175] 2) The difference between the target EGR rate and the actual EGR rate exceeds the preset value; in this example, it is set to ±0.15.

[0176] 3) The difference between the target opening degree of the mixing valve and the actual opening degree of the mixing valve exceeds the preset value; in this example, it is taken as ±1.5%.

[0177] 4) The ratio exceeds the preset value; in this example, it is set to -15% / 10ms.

[0178] This necessitates improving the achievement of the EGR rate. In other cases, then If the learning coefficients are updated, they will not be updated again in this driving cycle.

[0179] Reference Figure 3 The flowchart illustrates how to determine the action behavior of a mixing valve based on its target opening degree and the optimized rate of change of opening degree.

[0180] This embodiment provides a control method for a mixing valve transitioning from fully open to partially open. The method involves obtaining the initial mixing valve opening change rate under the current transition condition from fully open to partially open. A first multiplication correction coefficient is determined based on the actual gas pressure after the throttle and the target gas pressure after the throttle, and the actual gas pressure before the throttle. A second multiplication correction coefficient is determined based on the maximum boost capacity, minimum boost capacity, and actual boost capacity. A third multiplication correction coefficient is determined based on the ignition angle efficiency. The target mixing valve opening change rate is obtained based on the initial mixing valve opening change rate, the first multiplication correction coefficient, the second multiplication correction coefficient, the third multiplication correction coefficient, and the learning update coefficient. The mixing valve is then controlled based on the target mixing valve opening and the target mixing valve opening change rate, thus optimizing the control of the mixing valve opening change rate.

[0181] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the control method of the mixing valve in this application from fully open to partially open. Any simple modifications based on this technical concept are within the protection scope of this application.

[0182] This application also provides a control device for the process of a mixing valve changing from fully open to partially open. Please refer to [reference needed]. Figure 4 The control device for the mixing valve during the process of changing from fully open to partially open includes:

[0183] The operating condition confirmation module is used to obtain the initial rate of change of the mixing valve opening when the mixing valve is in the transition condition from fully open to partially open.

[0184] The first correction module is used to determine the multiplication first correction coefficient based on the actual gas pressure after the throttle and the target gas pressure after the throttle, and the actual gas pressure after the throttle and the actual gas pressure before the throttle.

[0185] The second correction module is used to determine the multiplicative second correction coefficient based on the maximum boost capacity, minimum boost capacity and actual boost capacity;

[0186] The third correction module is used to determine the multiplicative third correction coefficient based on the ignition angle efficiency;

[0187] The mixing valve control module is used to obtain the target mixing valve opening change rate based on the initial mixing valve opening change rate, the multiplication first correction coefficient, the multiplication second correction coefficient, the multiplication third correction coefficient, and the learning update coefficient, and to control the mixing valve based on the target mixing valve opening and the target mixing valve opening change rate.

[0188] The control device for the mixing valve during the process of changing from fully open to partially open provided in this application employs the control method for the mixing valve during the process of changing from fully open to partially open in the above embodiments, which can solve the technical problem that the prior art cannot accurately control the target opening degree of the mixing valve when controlling the opening degree of the mixing valve. Compared with the prior art, the beneficial effects of the control device for the mixing valve during the process of changing from fully open to partially open provided in this application are the same as the beneficial effects of the control method for the mixing valve during the process of changing from fully open to partially open provided in the above embodiments, and other technical features in the control device for the mixing valve during the process of changing from fully open to partially open are the same as the features disclosed in the method of the above embodiments, and will not be repeated here.

[0189] This application provides a control device for the process of a mixing valve changing from fully open to partially open. The control device for the process of a mixing valve changing from fully open to partially open includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the control method for the process of a mixing valve changing from fully open to partially open as described in Embodiment 1 above.

[0190] The following is for reference. Figure 5 This document illustrates a schematic diagram of a control device suitable for implementing the process of a mixing valve transitioning from fully open to partially open in the embodiments of this application. The control device for the mixing valve transitioning from fully open to partially open in the embodiments of this application may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital radio receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Description), PMPs (Portable Media Players), and in-vehicle terminals (e.g., in-vehicle navigation terminals), as well as fixed terminals such as digital TVs and desktop computers. Figure 5 The control device shown for the mixing valve during the process from fully open to partially open is merely an example and should not impose any limitation on the functionality and scope of the embodiments of this application.

[0191] like Figure 5As shown, the control device for the mixing valve during the process from fully open to partially open may include a processing unit 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in read-only memory (ROM) 1002 or a program loaded from storage device 1003 into random access memory (RAM) 1004. RAM 1004 also stores various programs and data required for the operation of the control device during the mixing valve's transition from fully open to partially open. The processing unit 1001, ROM 1002, and RAM 1004 are interconnected via bus 1005. Input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to I / O interface 1006: input devices 1007 including, for example, touchscreens, touchpads, keyboards, mice, image sensors, microphones, accelerometers, gyroscopes, etc.; output devices 1008 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices 1003 including, for example, magnetic tapes, hard disks, etc.; and communication devices 1009. Communication device 1009 allows the control device for the mixing valve during the process from fully open to partially open to exchange data with other devices wirelessly or via wired means. Although the figure shows a control device for the mixing valve during the process from fully open to partially open with various systems, it should be understood that it is not required to implement or possess all the systems shown. More or fewer systems may be implemented alternatively.

[0192] In particular, according to the embodiments disclosed in the present application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, the embodiments disclosed in the present application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program comprising 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 via 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.

[0193] The control device for the mixing valve during the process of changing from fully open to partially open provided in this application employs the control method for the mixing valve during the process of changing from fully open to partially open in the above embodiments, which can solve the technical problem that the prior art cannot accurately control the target opening degree of the mixing valve when controlling the opening degree of the mixing valve. Compared with the prior art, the beneficial effects of the control device for the mixing valve during the process of changing from fully open to partially open provided in this application are the same as the beneficial effects of the control method for the mixing valve during the process of changing from fully open to partially open provided in the above embodiments, and other technical features of the control device for the mixing valve during the process of changing from fully open to partially open are the same as the features disclosed in the method of the previous embodiment, and will not be repeated here.

[0194] It should be understood that the various parts disclosed in this application can be implemented using 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 suitable manner in one or more embodiments or examples.

[0195] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

[0196] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, the computer-readable program instructions being used to execute the control method for the mixing valve in the above embodiments during the process from fully open to partially open.

[0197] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. 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 conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0198] The aforementioned computer-readable storage medium may be included in the control device during the process of the mixing valve changing from fully open to partially open; or it may exist independently and not be assembled into the control device during the process of the mixing valve changing from fully open to partially open.

[0199] The aforementioned computer-readable storage medium carries one or more programs that, when executed by a control device during the process of the mixing valve changing from fully open to partially open, cause the control device during the process of the mixing valve changing from fully open to partially open to:

[0200] Obtain the initial rate of change of the mixing valve opening when the mixing valve is in the transition condition from fully open to partially open;

[0201] Based on the actual gas pressure after the throttle and the target gas pressure after the throttle, the first correction factor for multiplication is determined by the actual gas pressure after the throttle and the actual gas pressure before the throttle.

[0202] The second correction coefficient for multiplication is determined based on the maximum boost capacity, minimum boost capacity, and actual boost capacity.

[0203] The third correction coefficient for multiplication is determined based on the ignition angle efficiency;

[0204] The target mixing valve opening change rate is obtained based on the initial mixing valve opening change rate, the first multiplication correction coefficient, the second multiplication correction coefficient, the third multiplication correction coefficient, and the learning update coefficient. The mixing valve is then controlled based on the target mixing valve opening and the target mixing valve opening change rate.

[0205] 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 stand-alone 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 via 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).

[0206] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0207] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0208] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the control method for the mixing valve during the process of changing from fully open to partially open. This solves the technical problem in the prior art where the target opening degree of the mixing valve cannot be accurately controlled. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as the beneficial effects of the control method for the mixing valve during the process of changing from fully open to partially open provided in the above embodiments, and will not be repeated here.

[0209] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the control method described above for the process of a mixing valve moving from fully open to partially open.

[0210] The computer program product provided in this application can solve the technical problem that the prior art cannot accurately control the target opening degree of the mixing valve when controlling the opening degree of the mixing valve. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as the beneficial effects of the control method of the mixing valve from fully open to partially open in the above embodiments, and will not be repeated here.

[0211] The above description is only part of the embodiments of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made by using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A control method for a mixing valve during the process of changing from fully open to partially open, characterized in that, The control method for the mixing valve during the process of changing from fully open to partially open includes: Obtain the initial rate of change of the mixing valve opening when the mixing valve is in the transition condition from fully open to partially open; Based on the actual gas pressure after the throttle and the target gas pressure after the throttle, the first correction factor for multiplication is determined by the actual gas pressure after the throttle and the actual gas pressure before the throttle. The second correction coefficient for multiplication is determined based on the maximum boost capacity, minimum boost capacity, and actual boost capacity. The third correction coefficient for multiplication is determined based on the ignition angle efficiency; The target mixing valve opening change rate is obtained based on the initial mixing valve opening change rate, the first multiplication correction coefficient, the second multiplication correction coefficient, the third multiplication correction coefficient, and the learning update coefficient. The mixing valve is then controlled based on the target mixing valve opening and the target mixing valve opening change rate.

2. The method as described in claim 1, characterized in that, The step of determining the first multiplication correction coefficient based on the actual gas pressure after the throttle and the target gas pressure after the throttle, and the actual gas pressure after the throttle and the actual gas pressure before the throttle, includes: The first pressure ratio is obtained based on the actual gas pressure after the throttle and the target gas pressure after the throttle. The second pressure ratio is obtained based on the actual gas pressure after the throttle and the actual gas pressure before the throttle. The steps include determining the current engine speed and obtaining a first correction coefficient based on the first pressure ratio and the current engine speed; The second correction factor is obtained based on the second pressure ratio; The first correction factor for multiplication is determined based on the first correction factor and the second correction factor.

3. The method as described in claim 2, characterized in that, The step of determining the current engine speed and obtaining a first correction coefficient based on the first pressure ratio and the current engine speed includes: Determine the engine speed in the current sampling period and the engine speed in the previous sampling period, and obtain the engine speed fluctuation based on the engine speed in the current sampling period and the engine speed in the previous sampling period; Determine the first pressure ratio under the current sampling period and the first pressure ratio under the previous sampling period, and obtain the first pressure fluctuation based on the first pressure ratio under the current sampling period and the first pressure ratio under the previous sampling period; When the engine speed fluctuation does not exceed a preset speed fluctuation value and the first pressure fluctuation does not exceed a preset first pressure fluctuation value, the first correction coefficient is maintained; otherwise, the first correction coefficient is obtained based on the ratio of the current engine speed to the first pressure.

4. The method as described in claim 2, characterized in that, The step of obtaining the second correction coefficient based on the second pressure ratio includes: Obtain the second pressure ratio in the current sampling period and the second pressure ratio in the previous sampling period; The second pressure fluctuation is obtained based on the second pressure ratio under the current sampling period and the second pressure ratio under the previous sampling period; When the second pressure fluctuation does not exceed the preset second pressure fluctuation value, the second correction coefficient is maintained; otherwise, the second correction coefficient is obtained based on the second pressure ratio.

5. The method as described in claim 1, characterized in that, The step of determining the second multiplicative correction coefficient based on the maximum boost capacity, minimum boost capacity, and actual boost capacity includes: The first boost ratio is obtained based on the target boost ratio and the maximum boost ratio. When the first boost ratio is greater than the first preset value, the multiplication second correction coefficient is set to the first preset multiplication second correction coefficient; The second boost ratio is obtained based on the target boost ratio and the minimum boost ratio. When the second boost ratio is less than the second preset value, the multiplication second correction coefficient is set to the second preset multiplication second correction coefficient; The third boost capacity ratio is obtained based on the actual boost capacity and the target boost capacity. When the first boost ratio is less than a first preset value, or when the second boost ratio is greater than a second preset value, wherein the first preset value is less than the second preset value. The second correction factor is determined based on the current engine speed, the first boost ratio, the second boost ratio, and the third boost ratio.

6. The method as described in claim 5, characterized in that, The step of setting the multiplication second correction coefficient to the first preset multiplication second correction coefficient when the first boost ratio is greater than the first preset value further includes: Determine the difference between the target boost pressure and the actual boost pressure; Determine the fluctuation range of the target boost pressure and the fluctuation range of the actual boost pressure; When the difference is within a preset pressure range, the fluctuation range of the target boost pressure is within a preset fluctuation range, and the fluctuation range of the actual boost pressure is within the preset fluctuation range, the lock-in time is determined based on the actual boost pressure, the target boost pressure, and the engine speed.

7. The method as described in claim 1, characterized in that, The steps for determining the third correction coefficient based on the ignition angle efficiency include: Determine the ignition angle efficiency in the current sampling period and the ignition angle efficiency in the previous sampling period; The change in ignition angle efficiency is obtained based on the ignition angle efficiency in the current sampling period and the ignition angle efficiency in the previous sampling period. When the change in ignition angle efficiency is lower than the first preset change in ignition angle efficiency, the third multiplication correction coefficient is set to the first preset third multiplication correction coefficient. When the change in ignition angle efficiency is not less than the second preset change in ignition angle efficiency, the angle difference between the engine knock retardation angle and the maximum permissible retardation angle is determined, and the retardation angle ratio is obtained based on the angle difference and the maximum permissible retardation angle, wherein the first preset change in ignition angle efficiency is less than the second preset ignition angle efficiency ratio. The intake density ratio is obtained by determining the engine's current actual intake density and its maximum intake density. When the angle difference is not less than the preset angle difference and the intake density ratio does not exceed the preset intake density ratio, the multiplication third correction coefficient is set to the second preset multiplication third correction coefficient; Otherwise, the third correction factor of the multiplication is determined based on the ratio of the change in ignition angle efficiency to the basic ignition angle efficiency, the engine speed, the retarding angle ratio, and the intake air density ratio.

8. The method as described in claim 1, characterized in that, The step of obtaining the target mixing valve opening change rate based on the initial mixing valve opening change rate, the first multiplication correction coefficient, the second multiplication correction coefficient, the third multiplication correction coefficient, and the learning update coefficient, and controlling the mixing valve based on the target mixing valve opening and the target mixing valve opening change rate includes: The target mixing valve opening change rate is obtained by multiplying the initial mixing valve opening change rate, the first multiplication correction coefficient, the second multiplication correction coefficient, the third multiplication correction coefficient, and the learning update coefficient. The mixing valve is controlled based on the target opening degree of the mixing valve and the rate of change of the target mixing valve opening degree.

9. The method as described in claim 1, characterized in that, Before the step of obtaining the initial mixing valve opening change rate under the current mixing valve transition condition from fully open to partially open, the method further includes: Determine the state of the booster when the mixing valve is in the transition condition from fully open to partially open; When the turbocharger is in the closed-loop control active state, the target intake pressure change rate of the engine and the requested torque change rate of the engine are determined. When the engine target intake pressure change rate is greater than the preset intake pressure change rate and the engine requested torque change rate is greater than the preset engine requested torque change rate, it is determined that the engine mileage corresponding to the learning coefficient has not been updated. When the mileage is greater than the preset mileage, the step of obtaining the initial mixing valve opening change rate under the current mixing valve transition condition from fully open to partially open is executed.

10. A control device for a mixing valve during the process of changing from fully open to partially open, characterized in that, The device includes: The operating condition confirmation module is used to obtain the initial rate of change of the mixing valve opening when the mixing valve is in the transition condition from fully open to partially open. The first correction module is used to determine the multiplication first correction coefficient based on the actual gas pressure after the throttle and the target gas pressure after the throttle, and the actual gas pressure after the throttle and the actual gas pressure before the throttle. The second correction module is used to determine the multiplicative second correction coefficient based on the maximum boost capacity, minimum boost capacity and actual boost capacity; The third correction module is used to determine the multiplicative third correction coefficient based on the ignition angle efficiency; The mixing valve control module is used to obtain the target mixing valve opening change rate based on the initial mixing valve opening change rate, the multiplication first correction coefficient, the multiplication second correction coefficient, the multiplication third correction coefficient, and the learning update coefficient, and to control the mixing valve based on the target mixing valve opening and the target mixing valve opening change rate.

11. A control device for the process of a mixing valve changing from fully open to partially open, characterized in that, The device includes: 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 a control method for the mixing valve during the process of switching from fully open to partially open as described in 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, it implements the steps of the control method for the mixing valve during the process from fully open to partially open as described in any one of claims 1 to 9.

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