A control method, device, electronic device and storage medium for a supercharger

Abstract

The present invention provides a control method, device, electronic device and storage medium for a supercharger, the method comprising: obtaining the current throttle valve opening of the throttle valve; determining the throttle valve state based on the current throttle valve opening; if the throttle valve state is the first state, obtaining the current engine speed, cyclic injection amount and intake pressure; determining the feedforward opening and filtering time of the supercharger based on the current speed, cyclic injection amount and intake pressure; filtering the feedforward opening according to the filtering time to obtain the first supercharger required opening; controlling the supercharger to open according to the first supercharger required opening. When the present invention detects that the throttle valve has a small pressure build-up or a large variation, that is, the throttle valve state is the first state, it is determined that the intake pressure is unstable, the feedforward opening is filtered according to the filtering time corresponding to the intake pressure difference, the first supercharger required opening is determined, and the control method of the supercharger opening is optimized in time.

Description

Technical Field

[0001] The present invention relates to the field of engine technology, and in particular to a control method, device, electronic equipment and storage medium for a supercharger. Background Art

[0002] For the variable geometry turbocharger VGT, the intake flow of the engine under different working conditions is controlled by controlling the VGT valve opening to achieve the best air-fuel ratio, thereby improving the engine's power and economy.

[0003] In the prior art, the control of the supercharger opening is often carried out through the throttle valve and the supercharger. The throttle valve is controlled to hold the valve to increase the exhaust temperature, and the supercharger is controlled to perform a closed loop based on the corresponding intake pressure. Since the two actuator controls are coupled, when the throttle valve fluctuates, the intake pressure is unstable, which will cause the supercharger opening to fluctuate violently, resulting in reduced engine performance, increased noise, reduced valve reliability and other problems. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides a control method, device, electronic device and storage medium for a supercharger to solve the problems existing in the prior art such as drastic fluctuation of supercharger opening, reduced engine performance, increased noise, reduced valve reliability, etc.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] A first aspect of an embodiment of the present invention shows a method for controlling a supercharger, the method comprising:

[0007] Get the current throttle opening of the throttle valve;

[0008] determining a throttle valve state based on the current throttle valve opening;

[0009] If the throttle valve state is the first state, obtaining the current engine speed, cycle injection amount and intake pressure;

[0010] Determining a feedforward opening and a filtering time of a supercharger based on the current speed, the cycle injection amount and the intake pressure;

[0011] Filtering the feedforward opening according to the filtering time to obtain a required opening of the first supercharger;

[0012] The supercharger is controlled to open according to the first supercharger required opening degree.

[0013] Optionally, determining the throttle valve state based on the throttle valve opening includes:

[0014] Obtaining the exhaust temperature at the engine exhaust pipe;

[0015] When it is determined based on the exhaust temperature that the engine is in a thermal management mode, determining whether the current throttle valve opening is less than or equal to a preset opening threshold;

[0016] If so, determining that the throttle valve state is a first state;

[0017] If not, it is determined that the throttle valve state is the second state.

[0018] Optionally, determining the throttle valve state based on the throttle valve opening includes:

[0019] Calculating the difference between the current throttle valve opening and the throttle valve opening collected at a previous time to obtain a first change rate;

[0020] determining whether the first change rate is greater than or equal to a throttle valve change rate threshold;

[0021] If so, determining that the throttle valve state is a first state;

[0022] If not, it is determined that the throttle valve state is the second state.

[0023] Optionally, determining the feedforward opening and filtering time of the supercharger based on the current speed, the cyclic injection amount and the actual intake pressure includes:

[0024] Determine the feedforward opening of the supercharger based on the current speed and the cyclic injection amount;

[0025] Calculating the difference between the actual intake pressure and the preset intake pressure to obtain the intake pressure difference;

[0026] A filtering time of a supercharger feedforward opening is determined based on the intake air pressure difference.

[0027] Optionally, also include:

[0028] If the throttle valve state is in the second state, processing is performed based on the engine speed, the cycle injection amount, and the actual pressure to determine the required opening of the second supercharger;

[0029] The VGT is controlled to open according to the required opening degree of the second supercharger.

[0030] Optionally, the required opening degree of the second supercharger is determined based on the engine speed, the cycle injection amount, and the actual intake pressure, including:

[0031] Determining a feedforward opening of a supercharger based on a current speed and a cyclic injection amount of the engine;

[0032] Calculating the difference between the actual intake pressure and the preset intake pressure to obtain the intake pressure difference;

[0033] Perform PID control adjustment based on the intake pressure difference to obtain the pressure closed-loop output opening;

[0034] The second supercharger required opening is determined based on the feedforward opening and the pressure closed-loop output opening.

[0035] A second aspect of an embodiment of the present invention shows a control device for a supercharger, the device comprising:

[0036] An acquisition unit, used for acquiring a current throttle valve opening of the throttle valve;

[0037] a determining unit, configured to determine a throttle valve state based on the current throttle valve opening;

[0038] A first processing unit is used to obtain the current speed, cyclic injection amount and intake pressure of the engine if the throttle valve state is the first state; determine the feedforward opening and filtering time of the supercharger based on the current speed, cyclic injection amount and intake pressure; filter the feedforward opening according to the filtering time to obtain the first supercharger required opening;

[0039] The first control unit is used to control the supercharger to open according to the first supercharger required opening degree.

[0040] Optionally, also include:

[0041] a second processing unit, configured to determine a required opening of a second supercharger based on an engine speed, a cycle injection amount, and an actual pressure if the throttle valve state is in a second state;

[0042] The second control unit is used to control the supercharger to open according to the required opening degree of the second supercharger.

[0043] A third aspect of an embodiment of the present invention shows an electronic device, which is used to run a program, wherein when the program is run, the supercharger control method shown in the first aspect of the embodiment of the present invention is executed.

[0044] A fourth aspect of an embodiment of the present invention shows a computer storage medium, wherein the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the supercharger control method shown in the first aspect of the embodiment of the present invention.

[0045] Based on the above-mentioned embodiment of the present invention, a control method, device, electronic device and storage medium for a supercharger are provided, and the method includes: obtaining a current throttle valve opening of a throttle valve; determining a throttle valve state based on the current throttle valve opening; if the throttle valve state is a first state, obtaining the current engine speed, cyclic injection amount and intake pressure; determining a feedforward opening and a filtering time of the supercharger based on the current speed, cyclic injection amount and intake pressure; filtering the feedforward opening according to the filtering time to obtain a first supercharger required opening; and controlling the VGT to open according to the first supercharger required opening. In an embodiment of the present invention, when it is detected that the throttle valve's pressure build-up is small or the amplitude of change is relatively large, that is, the throttle valve state is the first state, it is determined that the intake pressure at this time is unstable, and the feedforward opening is filtered according to the filtering time corresponding to the intake pressure difference, and the first supercharger required opening is determined to control the opening of the supercharger VGT, and the control method of the supercharger opening is optimized in time, thereby avoiding the problems of drastic fluctuations in the supercharger opening due to the coupling of the throttle valve and supercharger control, unstable intake pressure, reduced engine performance, increased noise, reduced valve reliability, etc., thereby improving the performance advantage of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention 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, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0047] Figure 1 A schematic diagram of the interaction between an engine, a throttle valve, a supercharger and an electronic control unit according to an embodiment of the present invention;

[0048] Figure 2 A schematic flow chart of a method for controlling a supercharger according to an embodiment of the present invention;

[0049] Figure 3 The control logic diagram of the ECU during supercharger opening control shown in the embodiment of the present invention;

[0050] Figure 4 The present invention is a schematic structural diagram of a control device for a supercharger according to an embodiment of the present invention. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0053] It should be noted that the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0054] In this application, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0055] See also Figure 1 , which is a schematic diagram of the interaction between an engine, a throttle valve, a supercharger and an electronic control unit shown in an embodiment of the present invention.

[0056] The electronic control unit ECU10 is connected to the engine 20, the throttle valve 30, and the supercharger 40 respectively; the supercharger 40, the throttle valve 30, and the engine 20 are arranged in sequence from left to right.

[0057] One end of the supercharger 40 is directly connected to the engine 20 .

[0058] It should be noted that the supercharger 40 is a variable geometry turbocharger VGT.

[0059] Based on the architecture shown in the above embodiment of the present invention, the control process of the supercharger is specifically implemented including:

[0060] ECU10 obtains the current throttle valve opening of the throttle valve 30; determines the throttle valve state based on the current throttle valve opening; if the throttle valve state is the first state, obtains the current speed, cyclic injection amount and intake pressure of the engine 20; determines the feedforward opening and filtering time of the supercharger based on the current speed, cyclic injection amount and intake pressure; filters the feedforward opening according to the filtering time to obtain the first supercharger required opening; controls the supercharger 40 to open according to the first supercharger required opening.

[0061] In an embodiment of the present invention, when it is detected that the throttle valve's pressure build-up is small or the amplitude of change is relatively large, that is, the throttle valve state is in the first state, the intake pressure is unstable at this time, and the feedforward opening is filtered according to the filtering time corresponding to the intake pressure difference, and the required opening of the first supercharger is determined to control the opening of the supercharger VGT, and the control method of the supercharger opening is optimized in time, thereby avoiding the problems of drastic fluctuations in the supercharger opening due to the coupling of the throttle valve and supercharger control, unstable intake pressure, reduced engine performance, increased noise, reduced valve reliability, etc., thereby improving the performance advantage of the engine.

[0062] See also Figure 2 , is a flow chart of a method for controlling a supercharger according to an embodiment of the present invention, the method comprising:

[0063] Step S201: obtaining the current throttle valve opening of the throttle valve;

[0064] In the specific process of implementing step S201, the throttle valve opening is detected by using an opening detection device provided on the throttle valve.

[0065] Step S202: determining a throttle valve state based on the current throttle valve opening;

[0066] It should be noted that there are multiple implementation methods in the process of implementing step S202.

[0067] The first implementation method includes the following steps:

[0068] Step S11: obtaining the exhaust temperature at the engine exhaust pipe;

[0069] Step S12: judging whether the engine is in the thermal management mode based on the exhaust temperature, if so, executing step S13, if not, returning to executing step S11.

[0070] In the process of implementing step S11 and step S12, the exhaust temperature of the engine exhaust pipe is obtained by the temperature sensor provided at the engine exhaust pipe to determine whether the exhaust temperature is lower than the first temperature. If so, it means that the exhaust temperature needs to be increased, and step S13 is executed at this time. If not, return to execute step S11.

[0071] It should be noted that the first temperature represents a lower temperature which is set based on multiple experiments, and the embodiment of the present invention is not limited to this.

[0072] Step S13: Determine whether the engine is in thermal management mode, and judge whether the current throttle valve opening is less than or equal to a preset opening threshold. If so, execute step S14; if greater, execute step S15.

[0073] In the specific implementation of step S13, after determining that the engine is in thermal management mode, compare the current throttle valve opening with the preset opening threshold. If the throttle valve opening is less than or equal to the preset opening threshold, execute step S14; if the throttle valve opening is greater than the preset opening threshold, execute step S15.

[0074] It should be noted that the preset opening threshold is also set in advance based on multiple experiments, for example, it can be set to 30%, which is not limited in the embodiment of the present invention.

[0075] Step S14: Determine that the throttle valve state is the first state.

[0076] Step S15: Determine that the throttle valve state is the second state.

[0077] It should be noted that the first state refers to the throttle valve state being set to 1, indicating that the throttle valve is in an open state.

[0078] The second state refers to the throttle valve state being set to 0, indicating that the throttle valve is in a closed state.

[0079] In an embodiment of the present invention, when it is detected that the throttle valve's holding pressure is small and the intake pressure is unstable, the control method of the supercharger opening is optimized in time, that is, the process from step S203 to step S207 is executed to control the opening size of the VGT by the required opening of the first supercharger, thereby improving the stability of the engine's intake system, avoiding the problems of drastic fluctuations in the supercharger opening due to the coupling of the throttle valve and supercharger control, unstable intake pressure, reduced engine performance, increased noise, reduced valve reliability, etc., thereby improving the performance advantage of the engine.

[0080] The second implementation method comprises the following steps:

[0081] Step S21: Calculate the difference between the current throttle valve opening and the throttle valve opening collected at the last time to obtain a first change rate.

[0082] It should be noted that the last time is set according to the preset sampling frequency. If it is one second, the last time is the last second.

[0083] In the specific implementation of step S21, the ECU collects the throttle valve opening in real time through the collection frequency, and inputs the signal corresponding to the throttle valve opening collected at the last time into the delay device; when the current throttle valve opening is obtained, the delay device transmits the throttle valve opening corresponding to the signal collected at the last time to the ECU. The ECU calculates the difference between the current throttle valve opening and the throttle valve opening collected at the last time to obtain the first change rate.

[0084] It should be noted that the delay device DelayZ -1 The function is to delay the throttle valve opening signal for a period of time, that is, to delay it until the next acquisition frequency before transmitting it out.

[0085] For example, the current throttle valve opening is 25%, and the throttle valve opening last second is 10%. -1 After that, the delay device DelayZ -1 Output the opening value of the previous second, 10%.

[0086] Step S22: Determine whether the first change rate is greater than or equal to the throttle valve change rate threshold. If so, it means that the throttle valve opening changes dramatically, and execute step S23; if not, execute step S24.

[0087] In the process of implementing step S22, the absolute value of the first change rate is taken, and the first change rate is compared with the throttle change rate threshold. If the first change rate is greater than or equal to the throttle change rate threshold, step S23 is executed; if the first change rate is less than the throttle change rate threshold, step S24 is executed.

[0088] It should be noted that the throttle valve change rate threshold is also set in advance based on multiple experiments, for example, it can be set to 20%, which is not limited in this embodiment of the present invention.

[0089] Step S23: Determine that the throttle valve state is the first state.

[0090] Step S24: Determine that the throttle valve state is the second state.

[0091] It should be noted that the specific implementation process of step S23 and step S24 is the same as the specific implementation process of step S14 and step S15 mentioned above, and they can refer to each other.

[0092] In the embodiment of the present invention, when a relatively large change amplitude is detected, it is also necessary to timely optimize the control method of the supercharger opening, that is, to execute the process from step S203 to step S207, so as to control the opening size of the VGT by the required opening of the first supercharger, thereby improving the stability of the engine intake system, avoiding the problems such as drastic fluctuations in the supercharger opening due to the coupling of the throttle valve and the supercharger control, unstable intake pressure, reduced engine performance, increased noise, reduced valve reliability, etc., thereby improving the performance advantage of the engine.

[0093] Step S203: Determine whether the throttle valve state is the first state, if so, execute step S204, if not, it means that the throttle valve state is the second state, and execute step S208.

[0094] In the process of implementing step S203, if the engine is in thermal management mode and the current throttle valve opening is less than or equal to the preset opening threshold, it is determined that the throttle valve state is in the first state, and step S204 is executed; if the engine is not in thermal management mode, or the current throttle valve opening is greater than the preset opening threshold, first continue to determine whether the throttle valve opening has a drastic change. If it is determined that the throttle valve opening has a drastic change, it also means that the throttle valve state is in the first state. If the throttle valve opening does not change drastically, it is determined that the throttle valve state is the second state, and step S208 is executed.

[0095] In the embodiment of the present invention, only one of the conditions in steps S11 to S14 or steps S21 to S23 needs to be satisfied to indicate that the throttle valve is in the first state.

[0096] Step S204: obtaining the current engine speed, cycle injection amount and actual intake pressure;

[0097] Step S205: determining the feedforward opening and filtering time of the supercharger based on the current speed, cyclic injection amount and intake pressure;

[0098] It should be noted that the specific process of implementing step S205 includes the following steps:

[0099] Step S31: Determine the feedforward opening of the supercharger based on the current speed and the cyclic injection amount;

[0100] It should be noted that the feedforward opening is calibrated using the engine speed Epm_nEng and the cycle injection amount lnjCtl_qUnBal. Specifically, under various working conditions, the feedforward opening corresponding to the engine speed Epm_nEng and the cycle injection amount lnjCtl_qUnBal under different working conditions is obtained through experiments; and the feedforward opening is written into the ECU to calibrate the feedforward opening corresponding to the speed Epm_nEng and the cycle injection amount lnjCtl_qUnBal under different working conditions. The calibrated feedforward opening is stored in the form of a MAP diagram.

[0101] In the specific implementation of step S31, the current speed and cyclic injection amount of the engine are obtained; the corresponding MAP diagram is searched according to the current speed and cyclic injection amount obtained, and the feedforward opening matching the current speed and cyclic injection amount of the engine is obtained.

[0102] It should be noted that the cycle injection amount refers to the amount of fuel injected into the cylinder per cycle.

[0103] Step S32: Calculating the difference between the actual intake pressure and the preset intake pressure to obtain the intake pressure difference;

[0104] Step S33: Determine the filtering time of the supercharger feedforward opening based on the intake pressure difference.

[0105] It should be noted that the filtering time is calibrated using the intake pressure difference. Specifically, under various low-temperature environments, the filtering time corresponding to the difference between the actual intake pressure PCR_pDes and the preset intake pressure PCR_pAct of the engine under different operating conditions is obtained through experiments; the filtering time corresponding to the difference between the actual intake pressure PCR_pDes and the preset intake pressure PCR_pAct under different operating conditions is calibrated, and the calibrated filtering time is stored in the form of a CUR graph.

[0106] In the process of implementing step S32 and step S33, the actual current intake pressure PCR_pDes of the engine is obtained, and then the intake pressure difference between the actual intake pressure PCR_pDes and the preset intake pressure PCR_pAct is calculated; the corresponding CUR diagram is searched according to the calculated intake pressure difference to obtain the filtering time matching the intake pressure difference.

[0107] It should be noted that when the difference between the actual intake pressure and the set pressure is relatively large, the filtering time corresponding to the intake pressure difference is relatively small, and when the difference between the actual intake pressure and the set pressure is relatively small, the filtering time corresponding to the intake pressure difference is relatively large.

[0108] Step S206: filtering the feedforward opening according to the filtering time to obtain a required opening of the first supercharger;

[0109] In the process of implementing step S206, the input feedforward opening x, filtering time T and preset sampling time DT0.02 are filtered to control the filtering of the feedforward opening through the filtering time, so that the feedforward opening exceeding the preset value is filtered out to obtain the feedforward opening y maintained within the preset value, that is, the required opening of the first supercharger.

[0110] It should be noted that the preset value is set in advance based on experiments, and the embodiment of the present invention does not limit this.

[0111] Step S207: controlling the supercharger to open according to the first supercharger required opening degree.

[0112] In the process of implementing step S207, the supercharger VGT is controlled according to the required opening of the first supercharger to change the throat area of ​​the turbine housing by axially moving the sliding side wall in the turbine housing, thereby adjusting the intake flow of the engine, so that the engine can obtain a reasonable air-fuel ratio under any operating condition.

[0113] In the embodiment of the present invention, when it is detected that the throttle valve pressure is small or the variation is large, and the intake pressure is unstable, the control method of the supercharger opening is optimized in time, and the filter processing of the supercharger valve feedforward opening based on the intake pressure difference is applied. When the actual intake pressure is greatly different from the set pressure, a shorter filtering time is applied to ensure the responsiveness of the intake system; thereby avoiding the problems of drastic fluctuations in the supercharger opening due to unstable intake pressure, reduced engine performance, increased noise, and reduced valve reliability. When the actual intake pressure is different from the set pressure, a relatively large filtering time is applied to reduce the fluctuation amplitude of the supercharger valve, prevent the supercharger valve from drastically fluctuating, and improve the reliability of the supercharger valve.

[0114] Step S208: Determine the required opening of the second supercharger based on the engine speed, the cycle injection amount, and the actual intake pressure.

[0115] It should be noted that the specific process of implementing step S208 includes the following steps:

[0116] Step S51: determining the feedforward opening of the supercharger based on the current speed and cyclic injection amount of the engine.

[0117] Step S52: Calculate the difference between the actual intake pressure and the preset intake pressure to obtain the intake pressure difference.

[0118] It should be noted that the specific implementation process of step S51 and step S52 is the same as the specific implementation process of step S41 and step S42 mentioned above and can refer to each other.

[0119] Step S53: performing PID control adjustment based on the intake pressure difference to obtain a pressure closed-loop output opening;

[0120] In the specific implementation of step S53, the intake pressure difference is used as the input of the proportional-integral-differential controller PID, so that the PID performs proportional, integral, and differential processing on the intake pressure difference and outputs the pressure closed-loop output opening.

[0121] Step S54: determining the required opening of the second supercharger based on the feedforward opening and the pressure closed-loop output opening.

[0122] In the specific implementation of step S53, the feedforward opening and the pressure closed-loop output opening are calculated and added to obtain the required opening of the second supercharger.

[0123] Step S209: controlling the supercharger to open according to the second supercharger required opening degree.

[0124] In the specific implementation of step S209, the VGT is controlled according to the required opening of the second supercharger to change the throat area of ​​the turbine housing by axially moving the slidable side wall in the turbine housing, thereby adjusting the intake flow of the engine to achieve the optimal air-fuel ratio.

[0125] In one embodiment of the present application, see Figure 3 , which is the control logic diagram of ECU when supercharger opening is controlled.

[0126] like Figure 3 As shown, the feedforward opening corresponding to the engine speed Epm_nEng and the cycle injection amount lnjCtl_qUnBal under different working conditions is obtained through experiments, marked with a MAP diagram, and stored.

[0127] When the intake pressure is unstable, the corresponding feedforward opening is determined from the MAP based on the current engine speed Epm_nEng and the cycle injection amount lnjCtl_qUnBal;

[0128] Continue to see Figure 3 , based on the filter time corresponding to the difference between the actual intake pressure PCR_pDes and the preset intake pressure PCR_pAct of the engine under different working conditions obtained through experiments; the calibrated filter time is stored in the form of a CUR diagram.

[0129] The difference between the actual intake pressure PCR_pDes and the preset intake pressure PCR_pAct is calculated to obtain the intake pressure difference; when the actual intake pressure PCR_pDes is significantly different from the set pressure PCR_pAct, a shorter filtering time is applied to ensure the responsiveness of the intake system; when the actual intake pressure PCR_pDes is not significantly different from the set pressure PCR_pAct, a relatively longer filtering time is applied to reduce the fluctuation amplitude of the booster valve, prevent the booster valve from fluctuating violently, and improve the reliability of the booster valve.

[0130] Continue to see Figure 3 In the process of satisfying step S11 to step S14, or the specific process of satisfying step S21 to step S23, the throttle valve state can be the first state, that is, the throttle valve state is 1; otherwise, the throttle valve state is determined to be the second state, that is, the throttle valve state is 0.

[0131] If the throttle valve state is 1, PT filtering is performed based on the filtering time and the feedforward opening to obtain the first supercharger required opening, that is, the supercharger required opening 2; if the throttle valve state is 0, PID control is performed using the intake pressure difference, and the output pressure closed-loop output opening and the feedforward opening are added to obtain the second supercharger required opening, that is, the supercharger required opening 1.

[0132] In the embodiment of the present invention, when it is detected that the throttle valve's pressure is small or the variation is large, it indicates that the intake pressure is unstable, and the control method of the supercharger opening is optimized in time, and the feedforward opening is filtered according to the filter time corresponding to the intake pressure difference to determine the required opening of the first supercharger; otherwise, the required opening of the second supercharger is determined based on the feedforward opening and the intake pressure difference after PID adjustment. In order to control the opening of the supercharger VGT, the drastic fluctuation of the supercharger opening, the unstable intake pressure, the reduced engine performance, the increased noise, the reduced valve reliability and other problems caused by the coupling of the throttle valve and the supercharger control are avoided, thereby improving the performance advantage of the engine.

[0133] Based on the control method of a supercharger shown in the above embodiment of the present invention, correspondingly, the embodiment of the present invention shows a control device of a supercharger, such as Figure 4 As shown, the device comprises:

[0134] An acquisition unit 401 is used to acquire a current throttle valve opening of a throttle valve;

[0135] A determination unit 402, configured to determine a throttle valve state based on the current throttle valve opening;

[0136] The first processing unit 403 is used to obtain the current speed, cyclic injection amount and intake pressure of the engine if the throttle valve state is the first state; determine the feedforward opening and filtering time of the supercharger based on the current speed, cyclic injection amount and intake pressure; filter the feedforward opening according to the filtering time to obtain the first supercharger required opening;

[0137] The first control unit 404 is configured to control the supercharger to open according to the first supercharger required opening degree.

[0138] It should be noted that the specific implementation process of each unit of the supercharger control device shown in the above embodiment of the present invention is the same as the specific implementation process of the supercharger control method shown in the above embodiment, and they can refer to each other.

[0139] In the embodiment of the present invention, when it is detected that the throttle valve's pressure is small or the variation is large, it indicates that the intake pressure is unstable, and the control method of the supercharger opening is optimized in time, and the feedforward opening is filtered according to the filter time corresponding to the intake pressure difference to determine the required opening of the first supercharger; otherwise, the required opening of the second supercharger is determined based on the feedforward opening and the intake pressure difference after PID adjustment. In order to control the opening of the supercharger VGT, the drastic fluctuation of the supercharger opening, the unstable intake pressure, the reduced engine performance, the increased noise, the reduced valve reliability and other problems caused by the coupling of the throttle valve and the supercharger control are avoided, thereby improving the performance advantage of the engine.

[0140] Optionally, the control device for the supercharger shown in the above embodiment of the present invention further includes:

[0141] a second processing unit, configured to determine a required opening of a second supercharger based on an engine speed, a cycle injection amount, and an actual pressure if the throttle valve state is in a second state;

[0142] The second control unit is used to control the supercharger to open according to the required opening degree of the second supercharger.

[0143] The second processing unit is specifically used for:

[0144] Determining a feedforward opening of a supercharger based on a current speed and a cyclic injection amount of the engine;

[0145] Calculating the difference between the actual intake pressure and the preset intake pressure to obtain the intake pressure difference;

[0146] Perform PID control adjustment based on the intake pressure difference to obtain the pressure closed-loop output opening;

[0147] The second supercharger required opening is determined based on the feedforward opening and the pressure closed-loop output opening.

[0148] Optionally, based on the control device for the supercharger shown in the above embodiment of the present invention, the determining unit 402 is specifically configured to:

[0149] Obtaining the exhaust temperature at the engine exhaust pipe;

[0150] Determining that the engine is in a thermal management mode based on the exhaust temperature, and judging whether the current throttle valve opening is less than or equal to a preset opening threshold;

[0151] If so, determining that the throttle valve state is a first state;

[0152] If not, it is determined that the throttle valve state is the second state.

[0153] Optionally, based on the control device for the supercharger shown in the above embodiment of the present invention, the determining unit 402 is specifically configured to:

[0154] Calculating the difference between the current throttle valve opening and the throttle valve opening collected at a previous time to obtain a first change rate;

[0155] determining whether the first change rate is greater than or equal to a throttle valve change rate threshold;

[0156] If so, determining that the throttle valve state is a first state;

[0157] If not, it is determined that the throttle valve state is the second state.

[0158] Optionally, based on the control device of the supercharger shown in the above embodiment of the present invention, the first processing unit 403 that determines the feedforward opening and filtering time of the supercharger based on the current speed, the cyclic injection amount and the actual intake pressure is specifically used to:

[0159] Determine the feedforward opening of the supercharger based on the current speed and the cyclic injection amount;

[0160] Calculating the difference between the actual intake pressure and the preset intake pressure to obtain the intake pressure difference;

[0161] A filtering time of a supercharger feedforward opening is determined based on the intake air pressure difference.

[0162] The embodiment of the present invention also discloses an electronic device, which is used to run a database storage process, wherein the above-mentioned Figures 2 to 3 A control method for a supercharger is disclosed.

[0163] The embodiment of the present invention also discloses a storage medium, wherein the storage medium includes a storage database storage process, wherein when the database storage process is running, the device where the storage medium is located is controlled to execute the above Figures 2 to 3A control method for a supercharger is disclosed.

[0164] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work.

[0165] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0166] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for controlling a supercharger, characterized in that: The method comprises: Get the current throttle opening of the throttle valve; determining a throttle valve state based on the current throttle valve opening; If the throttle valve state is the first state, obtaining the current engine speed, cycle injection amount and intake pressure; Determining a feedforward opening and a filtering time of a supercharger based on the current speed, the cycle injection amount and the intake pressure; Filtering the feedforward opening according to the filtering time to obtain a required opening of the first supercharger; The supercharger is controlled to open according to the first supercharger required opening degree.

2. The method according to claim 1, characterized in that Determining a throttle valve state based on the throttle valve opening includes: Obtaining the exhaust temperature at the engine exhaust pipe; When it is determined based on the exhaust temperature that the engine is in a thermal management mode, determining whether the current throttle valve opening is less than or equal to a preset opening threshold; If so, determining that the throttle valve state is a first state; If not, it is determined that the throttle valve state is the second state.

3. The method according to claim 1, characterized in that Determining a throttle valve state based on the throttle valve opening includes: Calculating the difference between the current throttle valve opening and the throttle valve opening collected at a previous time to obtain a first change rate; determining whether the first change rate is greater than or equal to a throttle valve change rate threshold; If so, determining that the throttle valve state is a first state; If not, it is determined that the throttle valve state is the second state.

4. The method according to claim 1, characterized in that Determining the feedforward opening and filtering time of the supercharger based on the current speed, the cycle injection amount and the actual intake pressure includes: Determine the feedforward opening of the supercharger based on the current speed and the cyclic injection amount; Calculating the difference between the actual intake pressure and the preset intake pressure to obtain the intake pressure difference; A filtering time of a supercharger feedforward opening is determined based on the intake air pressure difference.

5. The method according to claim 1, characterized in that Also includes: If the throttle valve state is in the second state, processing is performed based on the engine speed, the cycle injection amount, and the actual pressure to determine the required opening of the second supercharger; The supercharger is controlled to open according to the required opening degree of the second supercharger.

6. The method according to claim 5, characterized in that Based on the engine speed, cycle injection amount, and actual intake pressure, the required opening of the second supercharger is determined, including: Determining a feedforward opening of a supercharger based on a current speed and a cyclic injection amount of the engine; Calculating the difference between the actual intake pressure and the preset intake pressure to obtain the intake pressure difference; Perform PID control adjustment based on the intake pressure difference to obtain the pressure closed-loop output opening; The second supercharger required opening is determined based on the feedforward opening and the pressure closed-loop output opening.

7. A control device for a supercharger, characterized in that: The device comprises: An acquisition unit, used for acquiring a current throttle valve opening of the throttle valve; a determining unit, configured to determine a throttle valve state based on the current throttle valve opening; A first processing unit is used to obtain the current speed, cyclic injection amount and intake pressure of the engine if the throttle valve state is the first state; determine the feedforward opening and filtering time of the supercharger based on the current speed, cyclic injection amount and intake pressure; filter the feedforward opening according to the filtering time to obtain the first supercharger required opening; The first control unit is used to control the supercharger to open according to the first supercharger required opening degree.

8. The device according to claim 7, characterized in that Also includes: a second processing unit, configured to determine a required opening of a second supercharger based on an engine speed, a cycle injection amount, and an actual pressure if the throttle valve state is in a second state; The second control unit is used to control the supercharger to open according to the required opening degree of the second supercharger.

9. An electronic device, characterized in that: The electronic device is used to run a program, wherein the program, when running, executes the supercharger control method according to any one of claims 1 to 6.

10. A computer storage medium, characterized in that: The storage medium includes a storage program, wherein when the program is executed, the device where the storage medium is located is controlled to execute the supercharger control method according to any one of claims 1 to 6.

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