Mixing valve opening degree control method and device, equipment and storage medium

Abstract

The invention discloses a mixing valve opening degree control method, device and equipment and a storage medium, and relates to the technical field of engine control, and the mixing valve opening degree control method comprises the steps that the opening degree adjustment coefficient of a mixing valve is calculated according to at least one of the current ignition angle efficiency, the current delay angle and the current air inlet density, obtaining a target opening degree adjustment coefficient; according to the target opening degree adjustment coefficient, the current opening degree change rate and the learning correction coefficient, the opening degree change rate of the mixing valve is calculated, and the target opening degree change rate is obtained; and controlling the opening degree of the mixing valve according to the target opening degree change rate. The mixing valve opening degree adjusting coefficient is determined based on the ignition angle efficiency, the knocking condition and the gas amount condition, and then the final mixing valve opening degree change rate is determined according to the mixing valve opening degree adjusting coefficient, so that the target opening degree change rate of the mixing valve is optimized in the process that the mixing valve requests to enter the non-full-opening state; and the engine dynamic property requirement and the engine safety protection are further improved.

Description

Technical Field

[0001] The present application relates to the field of engine control technology, and in particular to a mixing valve opening control method, device, equipment and storage medium. 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 EGR rate. Therefore, how to optimize the mixing valve opening rate from the perspective of balancing power and engine safety protection when the mixing valve changes from full opening to non-full opening has become an urgent problem to be solved. Summary of the invention

[0003] The main purpose of the present application is to provide a method, device, equipment and storage medium for controlling the opening of a mixing valve, aiming to solve the technical problem of how to optimize the target opening change rate of the mixing valve when the mixing valve requests to enter a non-fully open process, so as to further improve the power performance and engine safety protection during the control process.

[0004] To achieve the above objectives, the present application proposes a method for controlling the opening of a mixing valve, the method comprising: Calculating an opening adjustment coefficient of the mixing valve according to at least one of a current ignition angle efficiency, a current delay angle, and a current intake air density to obtain a target opening adjustment coefficient; Calculating the opening change rate of the mixing valve according to the target opening adjustment coefficient, the current opening change rate and the learning correction coefficient to obtain the target opening change rate; The opening of the mixing valve is controlled according to the target opening change rate.

[0005] In one embodiment, the step of calculating the opening adjustment coefficient of the mixing valve according to at least one of the current ignition angle efficiency, the current delay angle, and the current intake air density to obtain the target opening adjustment coefficient includes: Obtaining an ignition angle efficiency difference according to the historical ignition angle efficiency and the current ignition angle efficiency; Comparing the ignition angle efficiency difference with a preset efficiency difference to obtain an ignition angle efficiency difference comparison result; When the ignition angle efficiency difference comparison result is that the ignition angle efficiency difference is less than the preset efficiency difference, the target opening adjustment coefficient is determined to be the first opening adjustment coefficient.

[0006] In one embodiment, after the step of comparing the ignition angle efficiency difference with a preset efficiency difference to obtain an ignition angle efficiency difference comparison result, the method further includes: When the ignition angle efficiency difference comparison result is that the ignition angle efficiency difference is greater than or equal to the preset efficiency difference, acquiring an extreme delay angle and an extreme intake density; Obtaining a target postponement angle ratio according to the current postponement angle and the extreme postponement angle; Obtaining a target intake density ratio according to the extreme intake density and the current intake density; When the target delay angle ratio is greater than or equal to the preset delay angle ratio and the target intake density ratio is less than or equal to the preset intake density ratio, the target opening adjustment coefficient is determined to be a second opening adjustment coefficient, and the second opening adjustment coefficient is less than the first opening adjustment coefficient.

[0007] In one embodiment, the step of calculating the opening adjustment coefficient of the mixing valve according to at least one of the current ignition angle efficiency, the current delay angle, and the current intake air density to obtain the target opening adjustment coefficient includes: Obtaining a target ignition angle efficiency ratio according to the historical ignition angle efficiency, the current ignition angle efficiency and the basic ignition angle efficiency; Determining a corresponding ignition angle efficiency correction coefficient according to the target ignition angle efficiency ratio and the current engine speed; Determine a delay angle correction coefficient according to a target delay angle ratio corresponding to a current delay angle; Determine an intake air density correction coefficient according to a target intake air density ratio corresponding to the current intake air density; The opening adjustment coefficient of the mixing valve is calculated according to the ignition angle efficiency correction coefficient, the delay angle correction coefficient and the intake density correction coefficient to obtain a target opening adjustment coefficient.

[0008] In one embodiment, the step of calculating the opening change rate of the mixing valve according to the target opening adjustment coefficient, the current opening change rate and the initial learning correction coefficient to obtain the target opening change rate includes: When the mixing valve state, the supercharger state, the intake pressure change rate, the requested torque change rate and the engine mileage all meet the preset coefficient update conditions, the engine torque difference, the target delayed ignition angle, the exhaust gas circulation ratio difference and the opening change rate ratio are obtained; When the engine torque difference is greater than a torque difference threshold, the target delayed ignition angle is less than or equal to an ignition angle threshold, the exhaust gas circulation ratio difference is less than or equal to a ratio difference threshold, and the opening change rate ratio is less than or equal to a change rate ratio threshold, performing a difference calculation based on an initial learning correction coefficient and a first update coefficient to obtain an updated learning correction coefficient; The opening change rate of the mixing valve is calculated according to the target opening adjustment coefficient, the current opening change rate and the updated learning correction coefficient to obtain the target opening change rate.

[0009] In one embodiment, after the step of obtaining the engine torque difference, the target delayed ignition angle, the exhaust gas recirculation ratio difference and the opening change rate ratio when the mixing valve state, the supercharger state, the intake pressure change rate, the requested torque change rate and the engine mileage all meet the preset coefficient update conditions, the step further includes: When the engine torque difference is greater than a torque difference threshold, the target delayed ignition angle is less than or equal to an ignition angle threshold, the exhaust gas circulation ratio difference is greater than a ratio difference threshold, and the opening change rate ratio is less than or equal to a change rate ratio threshold, performing a difference calculation based on an initial learning correction coefficient and a second update coefficient to obtain an updated learning correction coefficient, wherein the second update coefficient is less than the first update coefficient; The opening change rate of the mixing valve is calculated according to the target opening adjustment coefficient, the current opening change rate and the updated learning correction coefficient to obtain the target opening change rate.

[0010] In one embodiment, after the step of obtaining the engine torque difference, the target delayed ignition angle, the exhaust gas recirculation ratio difference and the opening change rate ratio when the mixing valve state, the supercharger state, the intake pressure change rate, the requested torque change rate and the engine mileage all meet the preset coefficient update conditions, the step further includes: When the engine torque difference is greater than a torque difference threshold, the target delayed ignition angle is greater than an ignition angle threshold, the exhaust gas circulation ratio difference is less than or equal to a ratio difference threshold, and the opening change rate ratio is less than or equal to a change rate ratio threshold, calculating according to the initial learning correction coefficient and the third update coefficient to obtain an updated learning correction coefficient, wherein the third update coefficient is less than the second update coefficient; The opening change rate of the mixing valve is calculated according to the target opening adjustment coefficient, the current opening change rate and the updated learning correction coefficient to obtain the target opening change rate.

[0011] In one embodiment, after the step of obtaining the engine torque difference, the target delayed ignition angle, the exhaust gas recirculation ratio difference and the opening change rate ratio when the mixing valve state, the supercharger state, the intake pressure change rate, the requested torque change rate and the engine mileage all meet the preset coefficient update conditions, the step further includes: When the engine torque difference is greater than a torque difference threshold, the target delayed ignition angle is greater than an ignition angle threshold, the exhaust gas circulation ratio difference is greater than a ratio difference threshold, and the opening change rate ratio is less than or equal to a change rate ratio threshold, calculating according to the initial learning correction coefficient and four update coefficients to obtain an updated learning correction coefficient, wherein the fourth update coefficient is greater than the first update coefficient; The opening change rate of the mixing valve is calculated according to the target opening adjustment coefficient, the current opening change rate and the updated learning correction coefficient to obtain the target opening change rate.

[0012] In one embodiment, after the step of obtaining the engine torque difference, the target delayed ignition angle, the exhaust gas recirculation ratio difference and the opening change rate ratio when the mixing valve state, the supercharger state, the intake pressure change rate, the requested torque change rate and the engine mileage all meet the preset coefficient update conditions, the step further includes: When the engine torque difference is less than or equal to a torque difference threshold, the target delayed ignition angle is less than or equal to an ignition angle threshold, the exhaust gas circulation ratio difference is less than or equal to a ratio difference threshold, and the opening change rate ratio is less than or equal to a change rate ratio threshold, calculating according to the initial learning correction coefficient and the fifth update coefficient to obtain an updated learning correction coefficient, wherein the fifth update coefficient is greater than the fourth update coefficient; The opening change rate of the mixing valve is calculated according to the target opening adjustment coefficient, the current opening change rate and the updated learning correction coefficient to obtain the target opening change rate.

[0013] In addition, to achieve the above-mentioned purpose, the present application also proposes a mixing valve opening control device, the mixing valve opening control device comprising: a calculation module, configured to calculate an opening adjustment coefficient of the mixing valve according to at least one of a current ignition angle efficiency, a current delay angle, and a current intake air density, so as to obtain a target opening adjustment coefficient; The calculation module is further used to calculate the opening change rate of the mixing valve according to the target opening adjustment coefficient, the current opening change rate and the learning correction coefficient to obtain the target opening change rate; A control module is used to control the opening of the mixing valve according to the target opening change rate.

[0014] In addition, to achieve the above-mentioned purpose, the present application also proposes a mixing valve opening control device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, and the computer program is configured to implement the steps of the mixing valve opening control method described above.

[0015] 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 mixing valve opening control method described above are implemented.

[0016] 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 mixing valve opening control method described above are implemented.

[0017] The present application obtains a target opening adjustment coefficient by calculating the opening adjustment coefficient of the mixing valve according to at least one of the current ignition angle efficiency, the current delay angle, and the current intake air density; obtains a target opening change rate by calculating the opening change rate of the mixing valve according to the target opening adjustment coefficient, the current opening change rate, and the learning correction coefficient; and controls the opening of the mixing valve according to the target opening change rate. By determining the mixing valve opening adjustment coefficient based on the ignition angle efficiency, the knock condition, and the gas volume condition, and then determining the final mixing valve opening change rate according to the mixing valve opening adjustment coefficient, the target opening change rate of the mixing valve is optimized during the mixing valve request to enter the non-full opening process, so as to further improve the engine power requirements and engine safety protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] 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.

[0020] Figure 1 A flow chart of a mixing valve opening control method according to the present invention; Figure 2 A schematic diagram of the low-pressure EGR system architecture provided in Example 1 of the mixing valve opening control method of the present application; Figure 3 A flow chart of the second embodiment of the mixing valve opening control method of the present application; Figure 4 A brief flow chart of the mixing valve opening control method provided in Example 2 of the present application; Figure 5 This is a schematic diagram of the module structure of the mixing valve opening control device according to an embodiment of the present application; Figure 6 Schematic diagram of the equipment structure of the hardware operating environment involved in the mixing valve opening control method in the embodiment of the present application.

[0021] 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

[0022] 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.

[0023] 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.

[0024] The main solution of the embodiment of the present application is: calculate the opening adjustment coefficient of the mixing valve according to at least one of the current ignition angle efficiency, the current delay angle and the current intake density to obtain the target opening adjustment coefficient; calculate the opening change rate of the mixing valve according to the target opening adjustment coefficient, the current opening change rate and the learning correction coefficient to obtain the target opening change rate; control the opening of the mixing valve according to the target opening change rate.

[0025] 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 EGR rate. Therefore, how to optimize the mixing valve opening rate from the perspective of balancing power and engine safety protection when the mixing valve changes from full opening to non-full opening has become an urgent problem to be solved.

[0026] The present application obtains a target opening adjustment coefficient by calculating the opening adjustment coefficient of the mixing valve according to at least one of the current ignition angle efficiency, the current delay angle, and the current intake air density; obtains a target opening change rate by calculating the opening change rate of the mixing valve according to the target opening adjustment coefficient, the current opening change rate, and the learning correction coefficient; and controls the opening of the mixing valve according to the target opening change rate. By determining the mixing valve opening adjustment coefficient based on the ignition angle efficiency, the knock condition, and the gas volume condition, and then determining the final mixing valve opening change rate according to the mixing valve opening adjustment coefficient, the target opening change rate of the mixing valve is optimized during the mixing valve request to enter the non-full opening process, so as to further improve the engine power requirements and engine safety protection.

[0027] 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 a mixing valve opening control device capable of realizing the above functions, etc. The following takes the mixing valve opening control device as an example of the execution subject to illustrate this embodiment and the following embodiments.

[0028] Based on this, the embodiment of the present application provides a method for controlling the opening of a mixing valve, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the mixing valve opening control method of the present application.

[0029] In this embodiment, the mixing valve opening control method includes steps S10 to S30: Step S10, calculating the opening adjustment coefficient of the mixing valve according to at least one of the current ignition angle efficiency, the current delay angle and the current intake air density to obtain a target opening adjustment coefficient; It should be noted that if Figure 2 As shown, the low-pressure exhaust gas recirculation (EGR) system in this embodiment includes an air filter, a mixing valve, a supercharger compressor, a throttle, an engine, a supercharger turbine, a catalyst, a particulate matter trap, an EGR cooler, an EGR valve, an EGR temperature sensor, an EGR differential pressure sensor, a flow meter and a 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.

[0030] It can be understood that the current ignition angle efficiency refers to the ignition angle efficiency in this sampling period, the current delay angle refers to the current engine knock delay angle, the current intake density refers to the current actual intake density of the engine, and the target opening adjustment coefficient refers to the multiplication correction coefficient of the final mixing valve opening change rate ( ).

[0031] In a specific implementation, the final multiplication correction coefficient of the mixing valve opening change rate is obtained by calculating at least one of the ignition angle efficiency, the current engine knock delay angle and the current actual intake density of the engine in this sampling period.

[0032] In a feasible implementation, step S10 may include steps A11 to A13: Step A11, obtaining an ignition angle efficiency difference according to the historical ignition angle efficiency and the current ignition angle efficiency; It can be understood that the historical ignition angle efficiency refers to the ignition angle efficiency in the previous sampling cycle, and the ignition angle efficiency difference refers to the difference between the ignition angle efficiency in the current sampling cycle and the ignition angle efficiency in the previous sampling cycle.

[0033] In a specific implementation, the difference between the ignition angle efficiency in the previous sampling period and the ignition angle efficiency in the current sampling period is calculated to obtain the ignition angle efficiency difference.

[0034] Step A12, comparing the ignition angle efficiency difference with a preset efficiency difference to obtain an ignition angle efficiency difference comparison result; It can be understood that the preset efficiency difference refers to the critical value of the ignition angle efficiency difference used to determine the power demand. In this embodiment, -0.2 is taken as an example. The ignition angle efficiency difference comparison result refers to the comparison result between the ignition angle efficiency difference and the preset efficiency difference.

[0035] In a specific implementation, the difference between the ignition angle efficiency in this sampling cycle and the ignition angle efficiency in the previous sampling cycle is compared with a critical value of the ignition angle efficiency difference used to judge the power demand, and a comparison result of the ignition angle efficiency difference and the preset efficiency difference is obtained, that is, the ignition angle efficiency difference comparison result.

[0036] In a feasible implementation, step A12 may include steps B121 to B124: Step B121, when the ignition angle efficiency difference comparison result is that the ignition angle efficiency difference is greater than or equal to the preset efficiency difference, obtaining an extreme delay angle and an extreme intake density; It can be understood that the extreme delay angle refers to the maximum allowable delay angle of the engine, and the extreme intake density refers to the maximum intake density of the engine.

[0037] In a specific implementation, when the ignition angle efficiency difference comparison result is that the difference between the ignition angle efficiency in this sampling cycle and the ignition angle efficiency in the previous sampling cycle is greater than or equal to the ignition angle efficiency difference critical value used to judge the power demand, it indicates that the power demand is large at this time, and then the maximum allowable delay angle of the engine and the maximum intake density of the engine are obtained.

[0038] Step B122, obtaining a target postponement angle ratio according to the current postponement angle and the extreme postponement angle; It can be understood that the target retard angle ratio refers to the ratio of the difference between the engine knock retard angle and the maximum allowable retard angle to the maximum allowable retard angle.

[0039] In a specific implementation, the difference between the current engine knock delay angle and the maximum allowable engine delay angle is calculated to obtain the difference between the engine knock delay angle and the maximum allowable delay angle, and then the difference between the engine knock delay angle and the maximum allowable delay angle and the maximum allowable delay angle are calculated to obtain the difference between the engine knock delay angle and the maximum allowable delay angle and the ratio thereof to the maximum allowable delay angle, i.e., the target delay angle ratio.

[0040] Step B123, obtaining a target intake density ratio according to the extreme intake density and the current intake density; It can be understood that the target intake density ratio refers to the ratio of the current actual intake density of the engine to the maximum intake density.

[0041] In a specific implementation, the maximum intake density of the engine and the current actual intake density of the engine are calculated to obtain the ratio of the current actual intake density of the engine to the maximum intake density, that is, the target intake density ratio.

[0042] Step B124, when the target delay angle ratio is greater than or equal to the preset delay angle ratio and the target intake density ratio is less than or equal to the preset intake density ratio, determine the target opening adjustment coefficient as a second opening adjustment coefficient, and the second opening adjustment coefficient is less than the first opening adjustment coefficient.

[0043] It can be understood that the preset delay angle ratio refers to a preset critical value for determining the size of the delay angle ratio, and -0.6 is taken as an example in this embodiment. The preset intake density ratio refers to a preset critical value for determining the size of the intake density ratio, and 0.92 is taken as an example in this embodiment. The second opening adjustment coefficient refers to a preset mixing valve opening adjustment coefficient, and 0 is taken as an example in this embodiment.

[0044] In a specific implementation, when the difference between the engine knock delay angle and the maximum allowable delay angle and the ratio to the maximum allowable delay angle is greater than or equal to a preset critical value for judging the size of the delay angle ratio, and the ratio of the engine's current actual intake density to the maximum intake density is less than or equal to a preset critical value for judging the size of the intake density ratio, 0 is taken as the final mixing valve opening adjustment coefficient.

[0045] It should be noted that if both conditions are met, i) the change in ignition angle efficiency Not less than the preset value, in this example, 0.25; ii) Engine knock delay angle and maximum allowable delay angle (In this example, 10° is used to ensure that the knock delay angle is not too large to cause excessive loss of engine power) and the maximum allowable delay angle Ratio , not less than the preset value, in this example -0.6; iii) the actual current intake density of the engine With maximum intake density Ratio It does not exceed the preset value, which is 0.92 in this example. Then r3=0 to meet the dynamic requirements.

[0046] Step A13: when the ignition angle efficiency difference comparison result is that the ignition angle efficiency difference is less than the preset efficiency difference, determining the target opening adjustment coefficient as the first opening adjustment coefficient.

[0047] It can be understood that the first opening adjustment coefficient refers to a preset mixing valve opening adjustment coefficient, and this embodiment takes 1 as an example for illustration.

[0048] In a specific implementation, when the ignition angle efficiency difference comparison result is that the difference between the ignition angle efficiency in the current sampling cycle and the ignition angle efficiency in the previous sampling cycle is less than the ignition angle efficiency difference critical value used to judge the power demand, 1 is taken as the final mixing valve opening adjustment coefficient ( ).

[0049] It should be noted that if the change in ignition angle efficiency (the difference between the ignition angle efficiency in this sampling period and the ignition angle efficiency in the previous sampling period, the sampling period in this example is 10ms) is lower than the preset value, which is -0.2 in this example, then At this time, the dynamic demand is not large, and the priority is to meet the stability of the mixing valve opening control.

[0050] In a feasible implementation, step S10 may include steps B11 to B15: Step B11, obtaining a target ignition angle efficiency ratio according to the historical ignition angle efficiency, the current ignition angle efficiency and the basic ignition angle efficiency; It can be understood that the basic ignition angle efficiency refers to the ignition angle efficiency under a preset basic sampling period, and the target ignition angle efficiency ratio refers to the ratio of the ignition angle efficiency difference to the basic ignition angle efficiency.

[0051] In the specific implementation, the difference between the ignition angle efficiency in the current sampling cycle and the ignition angle efficiency in the previous sampling cycle is calculated to obtain the difference between the ignition angle efficiency in the current sampling cycle and the ignition angle efficiency in the previous sampling cycle, and the difference between the ignition angle efficiency in the current sampling cycle and the ignition angle efficiency in the previous sampling cycle is calculated with the ignition angle efficiency in the pre-set basic sampling cycle to obtain the ratio of the ignition angle efficiency difference to the basic ignition angle efficiency, that is, the target ignition angle efficiency ratio.

[0052] Step B12, determining a corresponding ignition angle efficiency correction coefficient according to the target ignition angle efficiency ratio and the current engine speed; It can be understood that the current engine speed refers to the speed at which the engine is currently running, and the ignition angle efficiency correction factor refers to the correction factor corresponding to the target ignition angle efficiency ratio and the current engine speed.

[0053] In a specific implementation, the correction coefficient is calculated according to the ratio of the ignition angle efficiency difference to the basic ignition angle efficiency and the current engine speed, and the correction coefficient corresponding to the target ignition angle efficiency ratio and the current engine speed is obtained.

[0054] Step B13, determining a delay angle correction coefficient according to a ratio of the current delay angle to the target delay angle; It can be understood that the delay angle correction coefficient refers to the correction coefficient corresponding to the target delay angle ratio.

[0055] In a specific implementation, a correction coefficient is calculated based on the difference between the engine knock delay angle corresponding to the current delay angle and the maximum allowable delay angle and the ratio thereof to the maximum allowable delay angle to obtain a correction coefficient corresponding to the target delay angle ratio, i.e., a delay angle correction coefficient.

[0056] Step B14, determining an intake air density correction coefficient according to a target intake air density ratio corresponding to the current intake air density; It can be understood that the intake density correction coefficient refers to the correction coefficient corresponding to the target intake density ratio.

[0057] In a specific implementation, the correction coefficient is calculated according to the ratio of the current actual intake density of the engine to the maximum intake density, and the correction coefficient corresponding to the target intake density ratio, ie, the intake density correction coefficient, is obtained.

[0058] Step B15, calculating the opening adjustment coefficient of the mixing valve according to the ignition angle efficiency correction coefficient, the delay angle correction coefficient and the intake density correction coefficient to obtain a target opening adjustment coefficient.

[0059] It can be understood that the correction coefficients corresponding to the target ignition angle efficiency ratio and the current engine speed, the correction coefficients corresponding to the target delay angle ratio and the correction coefficients corresponding to the target intake density ratio are summarized and calculated to obtain the final multiplication correction coefficient of the mixing valve opening change rate ( ).

[0060] It should be noted that in other cases, optimization is carried out from the perspectives of optimizing dynamic control, improving the impact of engine knock deterioration and mixing valve control accuracy.

[0061]

[0062] in, is the change in efficiency based on the ignition angle and basic ignition angle efficiency Ignition efficiency ratio and the correction factor determined by the engine speed n, Based on Determine the correction factor, Based on Determine the correction factor.

[0063] It should be noted that the ignition efficiency is The smaller the value, the smaller the change in ignition efficiency demand, and therefore the smaller the increase in power demand. At this time, the response to the mixing valve opening control can be given priority, so the larger the correction coefficient r3 is; in the ignition efficiency ratio If it is too large, it means that the change in ignition efficiency demand is greater, and therefore the increase in power demand is greater. At this time, we can consider responding to power demand first, so the correction coefficient r3 is smaller. In this example, at different engine speeds n, is -1, When it is not less than 0.95, by adjusting the different ignition efficiency ratios Get , ensuring that during the transition from fully open to partially open mixing valve, the difference between the engine target torque and the actual torque is controlled within ±5Nm for no more than 0.5s.

[0064] It is understandable that, similarly, in order to avoid the engine speed n and ignition efficiency ratio Too frequent fluctuations lead to If the adjustment change is too large and the correction coefficient r3 changes too much, the mixing valve opening control fluctuation is too large, resulting in poor mixing valve control stability, then the following processing is performed: when 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 is 10ms in this example) does not exceed the preset value (±40rpm in this example) and the ignition efficiency is Fluctuation (ignition efficiency ratio in this sampling period Compared with the ignition 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 is not updated.

[0065] It should be understood that after calibration After that, different engine speeds n are fixed and tested. When it is not less than 0.95, adjust To determine , to ensure that the difference between the target engine torque and the actual torque is within ±5Nm for no more than 0.5s during the transition from fully open to partially open mixing valve. and Then, different engine speeds n are fixed and tested. = -1, adjust To determine , to ensure that the difference between the target torque and the actual torque of the engine is controlled within ±5Nm for no more than 0.5s during the transition from fully open to partially open mixing valve. : .in To learn the update coefficient, its default value is 0 and can be saved after the vehicle is powered off.

[0066] Step S20, calculating the opening change rate of the mixing valve according to the target opening adjustment coefficient, the current opening change rate and the learning correction coefficient to obtain the target opening change rate; It can be understood that the learning correction coefficient refers to a parameter used to continuously adjust and optimize the operation of the engine, and the target opening change rate refers to the final mixing valve opening change rate.

[0067] In a specific implementation, the final mixing valve opening change rate is calculated based on the multiplication correction coefficient of the final mixing valve opening change rate, the current mixing valve opening change rate and the learning correction coefficient to obtain the final mixing valve opening change rate.

[0068] Step S30, controlling the opening of the mixing valve according to the target opening change rate.

[0069] It can be understood that the opening of the engine mixing valve is controlled according to the final mixing valve opening change rate, that is, based on the ignition angle efficiency, knock conditions, and gas volume conditions, the mixing valve opening change rate is controlled and optimized to improve the engine power requirements and engine safety protection (avoid aggravated knock) to achieve precise control of the mixing valve.

[0070] This embodiment calculates the opening adjustment coefficient of the mixing valve according to at least one of the current ignition angle efficiency, the current delay angle and the current intake air density to obtain the target opening adjustment coefficient; calculates the opening change rate of the mixing valve according to the target opening adjustment coefficient, the current opening change rate and the learning correction coefficient to obtain the target opening change rate; and controls the opening of the mixing valve according to the target opening change rate. By determining the mixing valve opening adjustment coefficient based on the ignition angle efficiency, the knock condition and the gas volume condition, and then determining the final mixing valve opening change rate according to the mixing valve opening adjustment coefficient, it is achieved to optimize the mixing valve target opening change rate during the mixing valve request to enter the non-full opening process, so as to further improve the engine power demand and engine safety protection.

[0071] 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 , step S20 in the mixing valve opening control method further includes steps S21 to S23: Step S21, when the mixing valve state, the supercharger state, the intake pressure change rate, the requested torque change rate and the engine mileage all meet the preset coefficient update conditions, the engine torque difference, the target delayed ignition angle, the exhaust gas circulation ratio difference and the opening change rate ratio are obtained; It can be understood that the mixing valve state refers to the current operating state of the mixing valve, the supercharger state refers to the current operating state of the supercharger, the intake pressure change rate refers to the engine target intake pressure change rate, the requested torque change rate refers to the engine requested torque change rate, the engine mileage refers to the engine mileage corresponding to the learning coefficient not being updated, the engine torque difference refers to the difference between the engine target torque and the actual torque, the target delayed ignition angle refers to the delayed ignition angle after the engine has knock, the exhaust gas circulation ratio difference refers to the difference between the target EGR rate and the actual EGR rate, and the opening change rate ratio refers to The preset coefficient update condition refers to the pre-set condition for updating the learning correction coefficient.

[0072] In a specific implementation, when the current operating state of the mixing valve, the current operating state of the supercharger, the engine target intake pressure change rate, the engine request torque change rate, and the engine mileage corresponding to the learning coefficient not being updated all meet the pre-set conditions for updating the learning correction coefficient, it indicates that the update of the learning correction coefficient is activated, and then the difference between the engine target torque and the actual torque, the delayed ignition angle after the engine knock occurs, the difference between the target EGR rate and the actual EGR rate, and ratio.

[0073] It should be noted that the learning coefficient The purpose of updating is to improve the power responsiveness and EGR rate response accuracy during the control process. The update method can only be activated when the following conditions (engine is in a large transient state) are met at the same time: the mixing valve is in the transition process from full open to non-full open; the supercharger is in the closed-loop control activation state; the absolute value of the engine target intake pressure change rate exceeds the preset value, which is 25kPa / 10ms in this example; the absolute value of the engine request torque change rate exceeds the preset value, which is 30Nm / 10ms in this example. The engine mileage corresponding to the learning coefficient not being updated exceeds the preset value, which is 20,000 kilometers in this example.

[0074] In a feasible implementation manner, step S21 may include steps A211 to A212: Step A211, when the engine torque difference is greater than a torque difference threshold, the target delayed ignition angle is less than or equal to an ignition angle threshold, the exhaust gas circulation ratio difference is greater than a ratio difference threshold, and the opening change rate ratio is less than or equal to a change rate ratio threshold, performing a difference calculation based on an initial learning correction coefficient and a second update coefficient to obtain an updated learning correction coefficient, wherein the second update coefficient is less than the first update coefficient; It can be understood that in this embodiment, the second update coefficient is 0.02, which is used to update the learning correction coefficient.

[0075] It should be noted that in the second case of this embodiment, the torque responsiveness is poor, the engine knock intensity is weak, and the EGR rate responsiveness is poor: the continuous time when the difference between the engine target torque and the actual torque exceeds ±5Nm exceeds 0.7s; the ignition angle is delayed by no more than 2° after the engine knock occurs; the difference between the target EGR rate and the actual EGR rate exceeds the preset value, which is ±0.15 in this example; The ratio does not exceed the preset value, which is -15% / 10ms in this example. The mixing valve opening can be adjusted appropriately to improve the torque response accuracy. .

[0076] Step A212, calculating the opening change rate of the mixing valve according to the target opening adjustment coefficient, the current opening change rate and the updated learning correction coefficient to obtain the target opening change rate.

[0077] In a specific implementation, the final mixing valve opening change rate is calculated based on the multiplication correction coefficient of the final mixing valve opening change rate, the current mixing valve opening change rate and the updated learning correction coefficient to obtain the final mixing valve opening change rate.

[0078] In a feasible implementation manner, step S21 may include steps B211 to B212: Step B211, when the engine torque difference is greater than the torque difference threshold, the target delayed ignition angle is greater than the ignition angle threshold, the exhaust gas circulation ratio difference is less than or equal to the ratio difference threshold, and the opening change rate ratio is less than or equal to the change rate ratio threshold, calculating according to the initial learning correction coefficient and the third update coefficient to obtain an updated learning correction coefficient, wherein the third update coefficient is less than the second update coefficient; It can be understood that in this embodiment, the third update coefficient is 0.01, which is used to update the learning correction coefficient.

[0079] It should be noted that in the third case of this embodiment, the torque responsiveness is poor, the engine knock intensity is strong, and the EGR rate responsiveness is good: the difference between the engine target torque and the actual torque exceeds ±5Nm for more than 0.7s; the continuous time of delaying the ignition angle by more than 6° after the engine knock occurs exceeds 0.1s; the difference between the target EGR rate and the actual EGR rate does not exceed the preset value ±0.1; The ratio does not exceed the preset value, which is -15% / 10ms in this example. Based on the engine knock protection angle, it is necessary to accelerate the mixing valve to enter the non-full opening, reduce the engine charging capacity, and reduce the knock risk. ,in It is the self-learning correction coefficient obtained from the last learning.

[0080] Step B212, calculating the opening change rate of the mixing valve according to the target opening adjustment coefficient, the current opening change rate and the updated learning correction coefficient to obtain the target opening change rate.

[0081] In a specific implementation, the final mixing valve opening change rate is calculated based on the multiplication correction coefficient of the final mixing valve opening change rate, the current mixing valve opening change rate and the updated learning correction coefficient to obtain the final mixing valve opening change rate.

[0082] In a feasible implementation manner, step S21 may include steps C211 to C212: Step C211, when the engine torque difference is greater than the torque difference threshold, the target delayed ignition angle is greater than the ignition angle threshold, the exhaust gas circulation ratio difference is greater than the ratio difference threshold, and the opening change rate ratio is less than or equal to the change rate ratio threshold, calculate according to the initial learning correction coefficient and the fourth update coefficient to obtain an updated learning correction coefficient, and the fourth update coefficient is greater than the first update coefficient It can be understood that in this embodiment, the fourth update coefficient is 0.06, which is used to update the learning correction coefficient.

[0083] It should be noted that in the fourth case of this implementation, the torque responsiveness is poor, the engine knock intensity is strong, and the EGR rate responsiveness is poor: the difference between the engine target torque and the actual torque exceeds ±5Nm for more than 0.7s; the continuous time when the ignition angle is delayed by more than 6° after the engine knocks exceeds 0.1s; the difference between the target EGR rate and the actual EGR rate exceeds the preset value, which is ±0.15 in this example; If the ratio does not exceed the preset value, in this example, -15% / 10ms, it is necessary to accelerate the mixing valve to a non-full opening state based on the engine knock protection angle, reduce the engine charging capacity, and reduce the knock risk. .

[0084] Step C212, calculating the opening change rate of the mixing valve according to the target opening adjustment coefficient, the current opening change rate and the updated learning correction coefficient to obtain the target opening change rate.

[0085] In a specific implementation, the final mixing valve opening change rate is calculated based on the multiplication correction coefficient of the final mixing valve opening change rate, the current mixing valve opening change rate and the updated learning correction coefficient to obtain the final mixing valve opening change rate.

[0086] In a feasible implementation manner, step S21 may include steps D211 to D212: Step D211, when the engine torque difference is less than or equal to the torque difference threshold, the target delayed ignition angle is less than or equal to the ignition angle threshold, the exhaust gas circulation ratio difference is less than or equal to the ratio difference threshold, and the opening change rate ratio is less than or equal to the change rate ratio threshold, calculating according to the initial learning correction coefficient and the fifth update coefficient to obtain an updated learning correction coefficient, wherein the fifth update coefficient is greater than the fourth update coefficient; It can be understood that in this embodiment, the fourth update coefficient is 0.08, which is used to update the learning correction coefficient.

[0087] It should be noted that in the fifth case of this embodiment, the torque responsiveness is good, the engine knock intensity is weak, and the EGR rate responsiveness is good: the difference between the engine target torque and the actual torque does not exceed ±5Nm; the ignition angle is delayed by no more than 2° after the engine knock occurs; the difference between the target EGR rate and the actual EGR rate does not exceed the preset value ±0.1; The ratio does not exceed the preset value. In this example, -15% / 10ms is taken. Then the torque response accuracy needs to be further improved. .

[0088] Step D212, calculating the opening change rate of the mixing valve according to the target opening adjustment coefficient, the current opening change rate and the updated learning correction coefficient to obtain the target opening change rate.

[0089] In a specific implementation, the final mixing valve opening change rate is calculated based on the multiplication correction coefficient of the final mixing valve opening change rate, the current mixing valve opening change rate and the updated learning correction coefficient to obtain the final mixing valve opening change rate.

[0090] Step S22, when the engine torque difference is greater than a torque difference threshold, the target delayed ignition angle is less than or equal to an ignition angle threshold, the exhaust gas circulation ratio difference is less than or equal to a ratio difference threshold, and the opening change rate ratio is less than or equal to a change rate ratio threshold, performing a difference calculation based on the initial learning correction coefficient and the first update coefficient to obtain an updated learning correction coefficient; It can be understood that the torque difference threshold refers to the critical value for determining the torque difference, the ignition angle threshold refers to the critical value for delaying the ignition angle, and the ratio difference threshold refers to the critical value for determining the exhaust gas circulation ratio difference. In this embodiment, the first update coefficient is 0.05, which is used to update the learning correction coefficient. The updated learning correction coefficient refers to the updated correction learning coefficient. .

[0091] It should be noted that in the first case of this embodiment, the torque responsiveness is poor, the engine knock intensity is weak, and the EGR rate responsiveness is good: the continuous time when the difference between the engine target torque and the actual torque exceeds ±5Nm exceeds 0.7s; the ignition angle is delayed by no more than 2° after the engine knock occurs; the difference between the target EGR rate and the actual EGR rate does not exceed the preset value ±0.1; The ratio does not exceed the preset value, which is -15% / 10ms in this example. Then the torque response accuracy needs to be further improved. ,in It is the self-learning correction coefficient obtained from the last learning.

[0092] Step S23, calculating the opening change rate of the mixing valve according to the target opening adjustment coefficient, the current opening change rate and the updated learning correction coefficient to obtain the target opening change rate.

[0093] In a specific implementation, the final mixing valve opening change rate is calculated based on the multiplication correction coefficient of the final mixing valve opening change rate, the current mixing valve opening change rate and the updated learning correction coefficient to obtain the final mixing valve opening change rate.

[0094] It should be noted that in the sixth case of this embodiment, the torque responsiveness is good, the engine knock intensity is weak, and the EGR rate responsiveness is poor: the difference between the engine target torque and the actual torque does not exceed ±5Nm; the ignition angle is delayed by no more than 2° after the engine knock occurs; the difference between the target EGR rate and the actual EGR rate exceeds the preset value, which is ±0.15 in this example; The ratio does not exceed the preset value, which is -15% / 10ms in this example. The mixing valve opening can be adjusted appropriately to improve the torque response accuracy. .

[0095] In the specific implementation, in the seventh case of this embodiment, the torque responsiveness is good, the engine knock intensity is strong, and the EGR rate responsiveness is good: the difference between the engine target torque and the actual torque does not exceed ±5Nm; the continuous time of delaying the ignition angle by more than 6° after the engine knock occurs exceeds 0.1s; the difference between the target EGR rate and the actual EGR rate does not exceed the preset value ±0.1; The ratio does not exceed the preset value, which is -15% / 10ms in this example. Based on the engine knock protection angle, it is necessary to accelerate the mixing valve to enter the non-full opening, reduce the engine charging capacity, and reduce the knock risk. .

[0096] It should be noted that in the eighth case of this embodiment, the torque responsiveness is good, the engine knock intensity is strong, and the EGR rate responsiveness is poor: the difference between the engine target torque and the actual torque does not exceed ±5Nm; the continuous time of delaying the ignition angle by more than 6° after the engine knock occurs exceeds 0.1s; the difference between the target EGR rate and the actual EGR rate exceeds the preset value, which is ±0.15 in this example; The ratio does not exceed the preset value, which is -15% / 10ms in this example. Based on the engine knock protection angle, it is necessary to accelerate the mixing valve to enter the non-full opening, reduce the engine charging capacity, and reduce the knock risk. .

[0097] In other cases, , if the learning coefficient is updated, the current driving cycle will no longer be updated.

[0098] This embodiment obtains the engine torque difference, target delayed ignition angle, exhaust gas circulation ratio difference and opening change rate ratio when the mixing valve state, supercharger state, intake pressure change rate, requested torque change rate and engine mileage all meet the preset coefficient update conditions; when the engine torque difference is greater than the torque difference threshold, the target delayed ignition angle is less than or equal to the ignition angle threshold, the exhaust gas circulation ratio difference is less than or equal to the ratio difference threshold and the opening change rate ratio is less than or equal to the change rate ratio threshold, the difference is calculated based on the initial learning correction coefficient and the first update coefficient to obtain the updated learning correction coefficient; the mixing valve opening change rate is calculated based on the target opening adjustment coefficient, the current opening change rate and the updated learning correction coefficient to obtain the target opening change rate. In the above manner, the accuracy of calculating the mixing valve opening change rate is improved.

[0099] For example, in order to help understand the implementation process of the mixing valve opening control method obtained by combining this embodiment with the above-mentioned embodiment 1, please refer to Figure 4 , Figure 4 A brief flow diagram of a mixing valve opening control method is provided, specifically: based on ignition angle efficiency, knock conditions, and gas volume conditions, the mixing valve opening change rate is controlled and optimized to improve engine power requirements and engine safety protection (avoiding aggravated knock).

[0100] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the mixing valve opening control method of the present application. More simple transformations based on this technical concept are all within the scope of protection of the present application.

[0101] This application also provides a mixing valve opening control device, please refer to Figure 5 , the mixing valve opening control device comprises: A calculation module 10, for calculating an opening adjustment coefficient of the mixing valve according to at least one of a current ignition angle efficiency, a current delay angle, and a current intake air density, to obtain a target opening adjustment coefficient; The calculation module 10 is further used to calculate the opening change rate of the mixing valve according to the target opening adjustment coefficient, the current opening change rate and the learning correction coefficient to obtain the target opening change rate; The control module 20 is used to control the opening of the mixing valve according to the target opening change rate.

[0102] Optionally, the calculation module 10 is further used for: Obtaining an ignition angle efficiency difference according to the historical ignition angle efficiency and the current ignition angle efficiency; Comparing the ignition angle efficiency difference with a preset efficiency difference to obtain an ignition angle efficiency difference comparison result; When the ignition angle efficiency difference comparison result is that the ignition angle efficiency difference is less than the preset efficiency difference, the target opening adjustment coefficient is determined to be the first opening adjustment coefficient.

[0103] Optionally, the calculation module 10 is further used for: When the ignition angle efficiency difference comparison result is that the ignition angle efficiency difference is greater than or equal to the preset efficiency difference, acquiring an extreme delay angle and an extreme intake density; Obtaining a target postponement angle ratio according to the current postponement angle and the extreme postponement angle; Obtaining a target intake density ratio according to the extreme intake density and the current intake density; When the target delay angle ratio is greater than or equal to the preset delay angle ratio and the target intake density ratio is less than or equal to the preset intake density ratio, the target opening adjustment coefficient is determined to be a second opening adjustment coefficient, and the second opening adjustment coefficient is less than the first opening adjustment coefficient.

[0104] Optionally, the calculation module 10 is further used for: Obtaining a target ignition angle efficiency ratio according to the historical ignition angle efficiency, the current ignition angle efficiency and the basic ignition angle efficiency; Determining a corresponding ignition angle efficiency correction coefficient according to the target ignition angle efficiency ratio and the current engine speed; Determine a delay angle correction coefficient according to a target delay angle ratio corresponding to a current delay angle; Determine an intake air density correction coefficient according to a target intake air density ratio corresponding to the current intake air density; The opening adjustment coefficient of the mixing valve is calculated according to the ignition angle efficiency correction coefficient, the delay angle correction coefficient and the intake density correction coefficient to obtain a target opening adjustment coefficient.

[0105] Optionally, the calculation module 10 is further used for: When the mixing valve state, the supercharger state, the intake pressure change rate, the requested torque change rate and the engine mileage all meet the preset coefficient update conditions, the engine torque difference, the target delayed ignition angle, the exhaust gas circulation ratio difference and the opening change rate ratio are obtained; When the engine torque difference is greater than a torque difference threshold, the target delayed ignition angle is less than or equal to an ignition angle threshold, the exhaust gas circulation ratio difference is less than or equal to a ratio difference threshold, and the opening change rate ratio is less than or equal to a change rate ratio threshold, performing a difference calculation based on an initial learning correction coefficient and a first update coefficient to obtain an updated learning correction coefficient; The opening change rate of the mixing valve is calculated according to the target opening adjustment coefficient, the current opening change rate and the updated learning correction coefficient to obtain the target opening change rate.

[0106] Optionally, the calculation module 10 is further used for: When the engine torque difference is greater than a torque difference threshold, the target delayed ignition angle is less than or equal to an ignition angle threshold, the exhaust gas circulation ratio difference is greater than a ratio difference threshold, and the opening change rate ratio is less than or equal to a change rate ratio threshold, performing a difference calculation based on an initial learning correction coefficient and a second update coefficient to obtain an updated learning correction coefficient, wherein the second update coefficient is less than the first update coefficient; The opening change rate of the mixing valve is calculated according to the target opening adjustment coefficient, the current opening change rate and the updated learning correction coefficient to obtain the target opening change rate.

[0107] Optionally, the calculation module 10 is further used for: When the engine torque difference is greater than a torque difference threshold, the target delayed ignition angle is greater than an ignition angle threshold, the exhaust gas circulation ratio difference is less than or equal to a ratio difference threshold, and the opening change rate ratio is less than or equal to a change rate ratio threshold, calculating according to the initial learning correction coefficient and the third update coefficient to obtain an updated learning correction coefficient, wherein the third update coefficient is less than the second update coefficient; The opening change rate of the mixing valve is calculated according to the target opening adjustment coefficient, the current opening change rate and the updated learning correction coefficient to obtain the target opening change rate.

[0108] Optionally, the calculation module 10 is further used for: When the engine torque difference is greater than a torque difference threshold, the target delayed ignition angle is greater than an ignition angle threshold, the exhaust gas circulation ratio difference is greater than a ratio difference threshold, and the opening change rate ratio is less than or equal to a change rate ratio threshold, calculating according to the initial learning correction coefficient and four update coefficients to obtain an updated learning correction coefficient, wherein the fourth update coefficient is greater than the first update coefficient; The opening change rate of the mixing valve is calculated according to the target opening adjustment coefficient, the current opening change rate and the updated learning correction coefficient to obtain the target opening change rate.

[0109] Optionally, the calculation module 10 is further used for: When the engine torque difference is less than or equal to a torque difference threshold, the target delayed ignition angle is less than or equal to an ignition angle threshold, the exhaust gas circulation ratio difference is less than or equal to a ratio difference threshold, and the opening change rate ratio is less than or equal to a change rate ratio threshold, calculating according to the initial learning correction coefficient and the fifth update coefficient to obtain an updated learning correction coefficient, wherein the fifth update coefficient is greater than the fourth update coefficient; The opening change rate of the mixing valve is calculated according to the target opening adjustment coefficient, the current opening change rate and the updated learning correction coefficient to obtain the target opening change rate.

[0110] The mixing valve opening control device provided by the present application adopts the mixing valve opening control method in the above embodiment, which can solve the technical problem of how to optimize the mixing valve target opening change rate when the mixing valve request enters the non-full opening process, so as to further improve the power performance and engine safety protection during the control process. Compared with the prior art, the beneficial effects of the mixing valve opening control device provided by the present application are the same as the beneficial effects of the mixing valve opening control method provided by the above embodiment, and the other technical features of the mixing valve opening control device are the same as the features disclosed in the above embodiment method, which will not be repeated here.

[0111] The present application provides a mixing valve opening control device, which includes: at least one processor; and a memory connected to the at least one processor in communication; 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 so that the at least one processor can execute the mixing valve opening control method in the above-mentioned embodiment one.

[0112] Reference below Figure 6 , which shows a schematic diagram of the structure of a mixing valve opening control device suitable for implementing the embodiment of the present application. The mixing valve opening control device 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 6The mixing valve opening control device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0113] like Figure 6 As shown, the mixing valve opening control device may include a processing device 1001 (such as 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. In RAM1004, various programs and data required for the operation of the mixing valve opening control device are also stored. The processing device 1001, ROM1002 and RAM1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the mixing valve opening control device to communicate with other devices wirelessly or by wire to exchange data. Although the mixing valve opening control 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 can be implemented or provided alternatively.

[0114] 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.

[0115] The mixing valve opening control device provided by the present application adopts the mixing valve opening control method in the above embodiment, which can solve the technical problem of how to optimize the mixing valve target opening change rate when the mixing valve request enters the non-full opening process, so as to further improve the power performance and engine safety protection in the control process. Compared with the prior art, the beneficial effects of the mixing valve opening control device provided by the present application are the same as the beneficial effects of the mixing valve opening control method provided by the above embodiment, and the other technical features in the mixing valve opening control device are the same as the features disclosed in the method of the previous embodiment, which will not be repeated here.

[0116] 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.

[0117] 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.

[0118] 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 mixing valve opening control method in the above-mentioned embodiment.

[0119] 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: Random Access Memory), a read-only memory (ROM: Read Only Memory), an erasable programmable read-only memory (EPROM: Erasable Programmable Read Only Memory or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM: CD-Read Only Memory), 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, which may 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: Radio Frequency), etc., or any suitable combination of the above.

[0120] The computer-readable storage medium may be included in the mixing valve opening control device; or may exist independently without being assembled into the mixing valve opening control device.

[0121] The above-mentioned computer-readable storage medium carries one or more programs. When the above-mentioned one or more programs are executed by the mixing valve opening control device, the mixing valve opening control device: calculates the opening adjustment coefficient of the mixing valve according to at least one of the current ignition angle efficiency, the current delay angle and the current intake density to obtain the target opening adjustment coefficient; calculates the opening change rate of the mixing valve according to the target opening adjustment coefficient, the current opening change rate and the learning correction coefficient to obtain the target opening change rate; controls the opening of the mixing valve according to the target opening change rate.

[0122] 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).

[0123] 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.

[0124] 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.

[0125] The readable storage medium provided in the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned mixing valve opening control method, and can solve the technical problem of how to optimize the mixing valve target opening change rate when the mixing valve request enters the non-full opening process, so as to further improve the power performance and engine safety protection during the control process. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in the present application are the same as the beneficial effects of the mixing valve opening control method provided in the above-mentioned embodiment, and will not be repeated here.

[0126] The present application also provides a computer program product, including a computer program, which implements the steps of the above-mentioned mixing valve opening control method when executed by a processor.

[0127] The computer program product provided by the present application can solve the technical problem of how to optimize the mixing valve target opening change rate when the mixing valve requests to enter the non-full opening process, so as to further improve the power performance and engine safety protection during the control process. 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 opening control method provided by the above embodiment, and will not be repeated here.

[0128] 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 controlling the opening of a mixing valve, characterized in that: The mixing valve opening control method comprises: Calculating an opening adjustment coefficient of the mixing valve according to at least one of a current ignition angle efficiency, a current delay angle, and a current intake air density to obtain a target opening adjustment coefficient; Calculating the opening change rate of the mixing valve according to the target opening adjustment coefficient, the current opening change rate and the learning correction coefficient to obtain the target opening change rate; The opening of the mixing valve is controlled according to the target opening change rate.

2. The method according to claim 1, characterized in that The step of calculating the opening adjustment coefficient of the mixing valve according to at least one of the current ignition angle efficiency, the current delay angle and the current intake air density to obtain the target opening adjustment coefficient comprises: Obtaining an ignition angle efficiency difference according to the historical ignition angle efficiency and the current ignition angle efficiency; Comparing the ignition angle efficiency difference with a preset efficiency difference to obtain an ignition angle efficiency difference comparison result; When the ignition angle efficiency difference comparison result is that the ignition angle efficiency difference is less than the preset efficiency difference, the target opening adjustment coefficient is determined to be the first opening adjustment coefficient.

3. The method according to claim 2, characterized in that After the step of comparing the ignition angle efficiency difference with the preset efficiency difference to obtain the ignition angle efficiency difference comparison result, the method further includes: When the ignition angle efficiency difference comparison result is that the ignition angle efficiency difference is greater than or equal to the preset efficiency difference, acquiring an extreme delay angle and an extreme intake density; Obtaining a target postponement angle ratio according to the current postponement angle and the extreme postponement angle; Obtaining a target intake density ratio according to the extreme intake density and the current intake density; When the target delay angle ratio is greater than or equal to the preset delay angle ratio and the target intake density ratio is less than or equal to the preset intake density ratio, the target opening adjustment coefficient is determined to be a second opening adjustment coefficient, and the second opening adjustment coefficient is less than the first opening adjustment coefficient.

4. The method according to claim 1, characterized in that The step of calculating the opening adjustment coefficient of the mixing valve according to at least one of the current ignition angle efficiency, the current delay angle and the current intake air density to obtain the target opening adjustment coefficient comprises: Obtaining a target ignition angle efficiency ratio according to the historical ignition angle efficiency, the current ignition angle efficiency and the basic ignition angle efficiency; Determining a corresponding ignition angle efficiency correction coefficient according to the target ignition angle efficiency ratio and the current engine speed; Determine a delay angle correction coefficient according to a target delay angle ratio corresponding to a current delay angle; Determine an intake air density correction coefficient according to a target intake air density ratio corresponding to the current intake air density; The opening adjustment coefficient of the mixing valve is calculated according to the ignition angle efficiency correction coefficient, the delay angle correction coefficient and the intake density correction coefficient to obtain a target opening adjustment coefficient.

5. The method according to claim 1, characterized in that The step of calculating the opening change rate of the mixing valve according to the target opening adjustment coefficient, the current opening change rate and the initial learning correction coefficient to obtain the target opening change rate comprises: When the mixing valve state, the supercharger state, the intake pressure change rate, the requested torque change rate and the engine mileage all meet the preset coefficient update conditions, the engine torque difference, the target delayed ignition angle, the exhaust gas circulation ratio difference and the opening change rate ratio are obtained; When the engine torque difference is greater than a torque difference threshold, the target delayed ignition angle is less than or equal to an ignition angle threshold, the exhaust gas circulation ratio difference is less than or equal to a ratio difference threshold, and the opening change rate ratio is less than or equal to a change rate ratio threshold, performing a difference calculation based on an initial learning correction coefficient and a first update coefficient to obtain an updated learning correction coefficient; The opening change rate of the mixing valve is calculated according to the target opening adjustment coefficient, the current opening change rate and the updated learning correction coefficient to obtain the target opening change rate.

6. The method according to claim 5, characterized in that After the step of obtaining the engine torque difference, the target delayed ignition angle, the exhaust gas circulation ratio difference and the opening change rate ratio when the mixing valve state, the supercharger state, the intake pressure change rate, the requested torque change rate and the engine mileage all meet the preset coefficient update conditions, the method further includes: When the engine torque difference is greater than a torque difference threshold, the target delayed ignition angle is less than or equal to an ignition angle threshold, the exhaust gas circulation ratio difference is greater than a ratio difference threshold, and the opening change rate ratio is less than or equal to a change rate ratio threshold, performing a difference calculation based on an initial learning correction coefficient and a second update coefficient to obtain an updated learning correction coefficient, wherein the second update coefficient is less than the first update coefficient; The opening change rate of the mixing valve is calculated according to the target opening adjustment coefficient, the current opening change rate and the updated learning correction coefficient to obtain the target opening change rate.

7. The method according to claim 5, characterized in that After the step of obtaining the engine torque difference, the target delayed ignition angle, the exhaust gas circulation ratio difference and the opening change rate ratio when the mixing valve state, the supercharger state, the intake pressure change rate, the requested torque change rate and the engine mileage all meet the preset coefficient update conditions, the method further includes: When the engine torque difference is greater than a torque difference threshold, the target delayed ignition angle is greater than an ignition angle threshold, the exhaust gas circulation ratio difference is less than or equal to a ratio difference threshold, and the opening change rate ratio is less than or equal to a change rate ratio threshold, calculating according to the initial learning correction coefficient and the third update coefficient to obtain an updated learning correction coefficient, wherein the third update coefficient is less than the second update coefficient; The opening change rate of the mixing valve is calculated according to the target opening adjustment coefficient, the current opening change rate and the updated learning correction coefficient to obtain the target opening change rate.

8. The method according to claim 5, characterized in that After the step of obtaining the engine torque difference, the target delayed ignition angle, the exhaust gas circulation ratio difference and the opening change rate ratio when the mixing valve state, the supercharger state, the intake pressure change rate, the requested torque change rate and the engine mileage all meet the preset coefficient update conditions, the method further includes: When the engine torque difference is greater than a torque difference threshold, the target delayed ignition angle is greater than an ignition angle threshold, the exhaust gas circulation ratio difference is greater than a ratio difference threshold, and the opening change rate ratio is less than or equal to a change rate ratio threshold, calculating according to the initial learning correction coefficient and four update coefficients to obtain an updated learning correction coefficient, wherein the fourth update coefficient is greater than the first update coefficient; The opening change rate of the mixing valve is calculated according to the target opening adjustment coefficient, the current opening change rate and the updated learning correction coefficient to obtain the target opening change rate.

9. The method according to claim 5, characterized in that After the step of obtaining the engine torque difference, the target delayed ignition angle, the exhaust gas circulation ratio difference and the opening change rate ratio when the mixing valve state, the supercharger state, the intake pressure change rate, the requested torque change rate and the engine mileage all meet the preset coefficient update conditions, the method further includes: When the engine torque difference is less than or equal to a torque difference threshold, the target delayed ignition angle is less than or equal to an ignition angle threshold, the exhaust gas circulation ratio difference is less than or equal to a ratio difference threshold, and the opening change rate ratio is less than or equal to a change rate ratio threshold, calculating according to the initial learning correction coefficient and the fifth update coefficient to obtain an updated learning correction coefficient, wherein the fifth update coefficient is greater than the fourth update coefficient; The opening change rate of the mixing valve is calculated according to the target opening adjustment coefficient, the current opening change rate and the updated learning correction coefficient to obtain the target opening change rate.

10. A mixing valve opening control device, characterized in that: The device comprises: a calculation module, configured to calculate an opening adjustment coefficient of the mixing valve according to at least one of a current ignition angle efficiency, a current delay angle, and a current intake air density, so as to obtain a target opening adjustment coefficient; The calculation module is further used to calculate the opening change rate of the mixing valve according to the target opening adjustment coefficient, the current opening change rate and the learning correction coefficient to obtain the target opening change rate; A control module is used to control the opening of the mixing valve according to the target opening change rate.

11. A mixing valve opening control device, 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 mixing valve opening control method 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 mixing valve opening control method according to any one of claims 1 to 9 are implemented.

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