Pressurization control method and device, equipment, storage medium and product

Abstract

The invention discloses a supercharging control method, device and equipment, a storage medium and a product, and relates to the technical field of engine control. The method comprises the steps that when a supercharging actuator quits supercharging closed-loop enabling, the initial opening maintaining duration of the supercharging actuator is determined, and the initial opening maintaining duration of the supercharging actuator is determined; the initial opening maintaining duration is a duration initial value when the target opening of the actuator corresponding to the supercharging actuator is kept unchanged; on the basis of the throttle valve working control mode, the initial opening maintaining duration is optimized, and the optimized opening maintaining duration is obtained; and pressurization control is conducted according to the optimized opening maintaining duration. According to the method, when the pressurization actuator quits the pressurization closed loop enabling, the problems of air inlet control smoothness and stability possibly caused when the pressurization closed loop quits are optimized, and the maintaining duration control of the target opening degree of the pressurization actuator after the pressurization closed loop quits is optimized; the stability of the air inlet pressure and the pressure of an outlet of the supercharger in the pressurization closed loop quitting process is improved.

Description

Technical Field

[0001] The present application relates to the field of engine control technology, and in particular to a boost control method, device, equipment, storage medium and product. Background Art

[0002] To respond to requests for intake boost and torque, the boost system controls the system to maximize exhaust energy for boost. Boost control determines engine performance and fuel economy. Closed-loop boost control actively controls the action of the boost actuator to ensure that actual boost pressure tracks the target boost pressure. In non-closed-loop boost control, the actuator opening is not actively controlled. When there is no intake boost demand, closed-loop boost control is disengaged, ensuring control stability and smoothness. However, disengaging the closed-loop boost control may lead to issues with control smoothness and stability. Summary of the Invention

[0003] The main purpose of this application is to provide a boost control method, device, equipment, storage medium and product, aiming to solve the technical problem of how to improve the smoothness and stability of intake control caused by the exit of the boost closed loop.

[0004] To achieve the above objectives, the present application proposes a boost control method, which includes:

[0005] When the boost actuator exits the boost closed-loop enable, determining the initial opening maintenance time of the boost actuator, wherein the initial opening maintenance time is an initial value of the time during which the actuator target opening corresponding to the boost actuator remains unchanged;

[0006] Optimizing the initial opening maintenance time based on the throttle operation control mode to obtain an optimized opening maintenance time;

[0007] Boost pressure control is performed according to the optimized opening maintenance time.

[0008] In one embodiment, the step of determining the duration for which the initial opening of the boost actuator is maintained when the boost actuator exits the boost closed-loop enable includes:

[0009] When the boost actuator exits the boost closed loop enable state, the pressure ratio of the actual throttle outlet pressure to the actual throttle inlet pressure is determined;

[0010] The initial opening maintenance time of the boost actuator is determined according to the pressure ratio and the current real-time engine speed.

[0011] In one embodiment, the step of determining the initial opening maintenance time of the boost actuator based on the pressure ratio and the current real-time engine speed includes:

[0012] Starting from the moment when the boost actuator exits the boost closed loop enable, determining whether the pressure difference between the throttle outlet target pressure and the throttle outlet actual pressure is within a preset fluctuation range;

[0013] If the pressure difference exceeds the preset fluctuation range, the time point at that time is used as the maintenance time point;

[0014] The duration of the initial opening maintenance time of the boost actuator is obtained by subtracting a preset number of sampling periods from the maintenance time point.

[0015] In one embodiment, the step of determining whether the pressure difference between the throttle outlet target pressure and the throttle outlet actual pressure is within a preset fluctuation range includes:

[0016] Determine a first pressure difference after first-order low-pass filtering corresponding to an original value of the pressure difference between the throttle outlet target pressure and the throttle outlet actual pressure in the Nth sampling period;

[0017] calculating an absolute value of a difference between the first pressure difference and an original value of the pressure difference;

[0018] calculating a product of a ratio limit coefficient and a minimum of the first pressure difference and an original value of the pressure difference;

[0019] It is determined whether the absolute value is smaller than the product.

[0020] In one embodiment, the step of determining a first pressure difference after first-order low-pass filtering corresponding to an original value of the pressure difference between the throttle outlet target pressure and the actual throttle outlet pressure in the Nth sampling period includes:

[0021] Determine a second pressure difference after first-order low-pass filtering corresponding to an original value of the pressure difference between the throttle outlet target pressure and the throttle outlet actual pressure in the N-1th sampling period;

[0022] The first pressure difference after the first-order low-pass filtering corresponding to the original value of the pressure difference in the Nth sampling period is determined according to the second pressure difference after the first-order low-pass filtering and the pressure difference filter coefficient.

[0023] In one embodiment, the step of optimizing the initial opening maintenance time based on the throttle operation control mode to obtain the optimized opening maintenance time includes:

[0024] If the throttle working control mode is the throttle full-open control mode, the optimized opening maintenance time is set to 0;

[0025] If the throttle operation control mode is the throttle overshoot prevention control mode, the current maintenance time is determined according to the preset time coefficient and the preset learning coefficient, and the current maintenance time is used as the optimized opening maintenance time;

[0026] Otherwise, the initial opening maintaining time is used as the optimized opening maintaining time.

[0027] In one embodiment, after the step of determining the current maintenance duration according to a preset time coefficient and a preset learning coefficient and using the current maintenance duration as the optimized opening maintenance duration if the throttle operation control mode is the throttle overshoot prevention control mode, the method further includes:

[0028] Recording a first actual number of times that a first update condition is satisfied in each driving cycle;

[0029] When the first actual number of times is greater than a preset number of times, updating the preset learning coefficient;

[0030] Among them, the first update condition is that the boost actuator exits the boost closed loop enable, the throttle working control mode is the throttle anti-overshoot control mode, the pressure difference between the throttle outlet target pressure and the throttle outlet actual pressure exceeds the preset fluctuation range for a continuous time exceeding a first preset time value, the actual outlet pressure fluctuation of the supercharger compressor exceeds the preset value for a continuous time exceeding a second preset time value, the ratio between the difference between the current maintenance time and the preset time coefficient and the preset time coefficient is not greater than the preset ratio, and the engine mileage in the time period from the last update of the preset learning coefficient to the current moment exceeds the preset mileage.

[0031] In one embodiment, after the step of determining the current maintenance duration according to a preset time coefficient and a preset learning coefficient and using the current maintenance duration as the optimized opening maintenance duration if the throttle operation control mode is the throttle overshoot prevention control mode, the method further includes:

[0032] Recording a second actual number of times that the second update condition is satisfied in each driving cycle;

[0033] When the second actual number of times is greater than a preset number of times, updating the preset learning coefficient;

[0034] Among them, the second update condition is that the boost actuator exits the boost closed loop enable, the throttle working control mode is the throttle anti-overshoot control mode, the pressure difference between the throttle outlet target pressure and the throttle outlet actual pressure is within a preset fluctuation range, the actual outlet pressure fluctuation of the supercharger compressor does not exceed the preset value, the ratio of the difference between the current maintenance time and the preset time coefficient to the preset time coefficient is greater than the preset ratio, and the engine mileage in the time period from the last update of the preset learning coefficient to the current moment exceeds the preset mileage.

[0035] In one embodiment, after the step of determining the current maintenance duration according to a preset time coefficient and a preset learning coefficient and using the current maintenance duration as the optimized opening maintenance duration if the throttle operation control mode is the throttle overshoot prevention control mode, the method further includes:

[0036] Recording a third actual number of times that the third update condition is satisfied in each driving cycle;

[0037] When the third actual number is greater than a preset number, updating the preset learning coefficient;

[0038] Among them, the third update condition is that the boost actuator exits the boost closed loop enable, the throttle working control mode is the throttle anti-overshoot control mode, the pressure difference between the throttle outlet target pressure and the throttle outlet actual pressure is within a preset fluctuation range, the actual outlet pressure fluctuation of the supercharger compressor exceeds the preset value for a continuous time exceeding a second preset time value, the ratio between the difference between the current maintenance time and the preset time coefficient and the preset time coefficient is greater than the preset ratio, and the engine mileage in the time period from the last update of the preset learning coefficient to the current moment exceeds the preset mileage.

[0039] In addition, to achieve the above-mentioned purpose, the present application also proposes a boost control device, which includes:

[0040] an initial duration determination module, configured to determine the initial opening maintenance duration of the boost actuator when the boost actuator exits the boost closed-loop enable state, wherein the initial opening maintenance duration is an initial value of the duration during which the actuator target opening corresponding to the boost actuator remains unchanged;

[0041] An initial duration optimization module, configured to optimize the initial opening maintenance duration based on a throttle operation control mode to obtain an optimized opening maintenance duration;

[0042] The boost control module is used to perform boost control according to the optimized opening maintenance time.

[0043] In addition, to achieve the above-mentioned purpose, the present application also proposes a boost control device, which includes: 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 boost control method as described above.

[0044] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium and stores a computer program. When the computer program is executed by a processor, the steps of the boost control method described above are implemented.

[0045] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the steps of the boost control method described above are implemented.

[0046] The present application provides a boost control method, which determines the initial opening maintenance time of the boost actuator when the boost actuator exits the boost closed loop enable, and the initial opening maintenance time is the initial value of the time during which the actuator target opening corresponding to the boost actuator remains unchanged; optimizes the initial opening maintenance time based on the throttle working control mode to obtain the optimized opening maintenance time; and performs boost control according to the optimized opening maintenance time. The present application optimizes the intake control smoothness and stability problems that may be caused by the exit of the boost closed loop when the boost actuator exits the boost closed loop enable, and optimizes the control of the maintenance time of the boost actuator target opening after the boost closed loop exits, thereby improving the stability of the intake pressure and the supercharger outlet pressure during the exit of the boost closed loop. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0049] Figure 1 A flow chart of the first embodiment of the boost control method of the present application;

[0050] Figure 2 This is a schematic diagram of the architecture of the low-pressure EGR system in this application;

[0051] Figure 3A flow chart of the second embodiment of the boost control method of the present application;

[0052] Figure 4 A flow chart of the third embodiment of the boost control method of the present application;

[0053] Figure 5 This is a schematic diagram of the module structure of the boost control device according to an embodiment of the present application;

[0054] Figure 6 Schematic diagram of the device structure of the hardware operating environment involved in the boost control method in the embodiment of the present application.

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

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

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

[0058] The main solution of the embodiment of the present application is: when the boost actuator exits the boost closed-loop enable, determining the initial opening maintenance time of the boost actuator, the initial opening maintenance time being the initial value of the time during which the actuator target opening corresponding to the boost actuator remains unchanged; optimizing the initial opening maintenance time based on the throttle working control mode to obtain the optimized opening maintenance time; and performing boost control according to the optimized opening maintenance time.

[0059] In existing technologies, boost systems are controlled to maximize exhaust energy for boost in response to engine intake boost and torque increases. Boost control determines engine power and economy, among other things. Boost closed-loop control actively controls the action of the boost actuator to ensure tracking of actual boost pressure with target boost pressure. In contrast, in non-closed-loop boost control, the boost actuator opening is not actively controlled. When there is no intake boost demand, closed-loop boost control is discontinued, ensuring control stability and smoothness. However, discontinuing the closed-loop boost control can lead to issues with control smoothness and stability.

[0060] The present application provides a solution, which determines the initial opening maintenance time of the boost actuator when the boost actuator exits the boost closed loop enablement, and the initial opening maintenance time is the initial value of the time during which the actuator target opening corresponding to the boost actuator remains unchanged; optimizes the initial opening maintenance time based on the throttle working control mode to obtain the optimized opening maintenance time; and performs boost control according to the optimized opening maintenance time. The present application optimizes the intake control smoothness and stability problems that may be caused by the exit of the boost closed loop when the boost actuator exits the boost closed loop enablement, and optimizes the control of the maintenance time of the boost actuator target opening after the boost closed loop exits, thereby improving the stability of the intake pressure and the supercharger outlet pressure during the exit of the boost closed loop.

[0061] Based on this, the embodiment of the present application provides a boost control method, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the boost control method of the present application.

[0062] In this embodiment, the boost control method includes steps S10 to S30:

[0063] Step S10, when the boost actuator exits the boost closed loop enable, determining the initial opening maintenance time of the boost actuator, wherein the initial opening maintenance time is the initial value of the time during which the actuator target opening corresponding to the boost actuator remains unchanged.

[0064] It is understandable that the boost control method in this embodiment is applied to a low-pressure EGR system. Figure 2The architecture of the low-pressure EGR system is explained. A system with a low-pressure EGR system and an exhaust gas turbocharger includes components such as the air filter, mixing valve, supercharger compressor, throttle, engine, supercharger turbine, catalyst, particulate matter filter, EGR cooler, EGR valve, EGR temperature sensor, EGR differential pressure sensor, flow meter, and linear oxygen sensor. The supercharger compressor compresses fresh air for boosting, while the supercharger turbine controls the operating efficiency of the turbine by controlling the opening of the supercharger's wastegate valve, thereby achieving different boost capacities. Compared to a non-low-pressure EGR system, a low-pressure EGR system has the following additional components: an EGR cooler, EGR temperature sensor, EGR valve, EGR differential pressure sensor, mixing valve, flow meter, and linear oxygen sensor. Among them, the flow meter is installed between the air filter and the mixing valve, which is used to detect the fresh air flow entering the engine and is optional (that is, whether to install it can be determined according to the vehicle model, which is optional. If it is not selected, the estimation method is used to obtain the corresponding information); the mixing valve is used to adjust the pressure at the EGR valve outlet, increase the pressure difference at both ends of the EGR valve, and increase the EGR rate; the oxygen sensor is optional and is installed between the compressor and the throttle, close to the throttle, and is used to detect the mixture flow entering the cylinder; the EGR cooler is used to cool the exhaust gas, which is convenient for increasing the exhaust gas flow and reducing the exhaust gas temperature; the EGR valve has a throttling effect and controls 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.

[0065] It is understandable that in this embodiment, when the boost actuator exits the boost closed loop enable, how to set the boost actuator target opening is a matter to be considered in this application, specifically, determining the boost actuator target opening pct after the boost actuator exits the boost closed loop enable. BoostActuatorDsrd The corresponding hold time is the duration during which the opening remains constant. Failure to do so can lead to intake pressure stability issues. Assuming the boost control demand is maximum, the boost actuator target opening is 100%; assuming the boost control demand is minimum, the boost actuator target opening is 0%. Otherwise, the boost actuator target opening is between 0% and 100%.

[0066] It should be understood that the determination of whether the boost actuator has exited the boost closed-loop enable state can be made by determining when the boost closed-loop condition transitions from being satisfied to being unsatisfied. This means that the condition is satisfied during the previous sampling cycle and unsatisfied during the current sampling cycle. In this example, the sampling period can be 10ms. Calibration can be performed on an engine test bench to measure the initial duration that the target actuator opening remains unchanged, starting from the first sampling cycle in which the boost closed-loop condition is unsatisfied.

[0067] Step S20 , optimizing the initial opening maintenance time based on the throttle operation control mode to obtain an optimized opening maintenance time.

[0068] It's understandable that the initial value t for the duration the actuator target opening is maintained is primarily determined through calibration on an engine test bench. However, during on-vehicle calibration testing, this duration will need to be optimized, specifically based on the throttle control mode.

[0069] Step S30 , performing boost control according to the optimized opening maintenance time.

[0070] This embodiment provides a boost control method. When the boost actuator exits the boost closed-loop enablement, the initial opening maintenance time of the boost actuator is determined. The initial opening maintenance time is the initial value of the time during which the target opening of the actuator corresponding to the boost actuator remains unchanged. The initial opening maintenance time is optimized based on the throttle operating control mode to obtain an optimized opening maintenance time. Boost control is performed based on the optimized opening maintenance time. This embodiment optimizes the intake control smoothness and stability issues that may arise when the boost closed-loop exits the boost closed-loop enablement, optimizes the control of the maintenance time of the boost actuator target opening after the boost closed-loop exit, and improves the stability of the intake pressure and supercharger outlet pressure during the boost closed-loop exit process.

[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 embodiment 1 can be referred to the above introduction and will not be described in detail later. Figure 3 , step S10, the boost control method further includes steps S101 to S102:

[0072] Step S101 : when the boost actuator exits the boost closed-loop enable state, the pressure ratio of the actual throttle outlet pressure to the actual throttle inlet pressure is determined.

[0073] Step S102: determining the initial opening maintenance time of the boost actuator according to the pressure ratio and the current real-time engine speed.

[0074] It should be noted that when the boost actuator exits the boost closed loop enable, the actual throttle outlet pressure p BfThrAct The actual inlet pressure p AftThrAct Ratio r PreRatio =p BfThrAct / p AftThrAct , and the current engine real-time speed n determine the boost actuator target opening pct BoostActuatorDsrd Maintain the initial value t for the duration that remains unchanged. That is, determine pct BoostActuatorDsrd =pctBoostActuatorDsrd (z) duration, where pct BoostActuatorDsrd (z) is the actuator target opening in the last sampling period, that is, the actuator target opening when the boost closed-loop condition is met in the last sampling period. In a feasible embodiment, step S102 may include steps S1021 to S1023:

[0075] Step S1021 , starting from the moment when the boost actuator exits the boost closed-loop enable, determines whether the pressure difference between the throttle outlet target pressure and the throttle outlet actual pressure is within a preset fluctuation range.

[0076] It is understandable that the initial opening maintenance time can be calculated according to the following formula:

[0077] t=f(r PreRatio ,n),

[0078] The ignition angle efficiency is 1, the EGR rate is 0, and it is determined whether the fluctuation of the pressure difference between the throttle outlet target pressure and the throttle outlet actual pressure is within a preset fluctuation range.

[0079] Step S1022: If the pressure difference exceeds the preset fluctuation range, the time point at this time is used as the maintenance time point.

[0080] Step S1023 : Subtracting a preset number of sampling periods from the maintenance duration point as the initial opening maintenance duration of the boost actuator.

[0081] It is understood that if the pressure difference exceeds the preset fluctuation range, the time point at that point is used as the maintenance duration point, and the duration of the preset number of sampling periods minus the maintenance duration point is used as the initial opening maintenance duration of the boost actuator. That is, from the first sampling period in which the boost closed-loop condition is not met to the preset number of sampling periods after the initial duration value t (the preset number of sampling periods after the initial duration value t can be, for example, two sampling periods before the actuator target opening transition control is implemented to ensure pressure stability), the ignition angle efficiency is 1, the EGR rate is 0, and the fluctuation of the difference between the throttle outlet target pressure and the actual throttle outlet pressure is within the preset range.

[0082] In a feasible implementation, step S1021 may include steps A01 to A04:

[0083] Step A01 : determining a first pressure difference after first-order low-pass filtering corresponding to the original value of the pressure difference between the throttle outlet target pressure and the throttle outlet actual pressure in the Nth sampling period.

[0084] It is worth noting that the original value p of the pressure difference in the Nth sampling period can be calculated by the following formula:AftThrErr (N) corresponds to the first pressure difference p after the first-order low-pass filter AftThrErrFilter (N):

[0085] p AftThrErrFilter (N) = K AftThrErr ×[p AftThrErr (N)-p AftThrErrFilter (N-1)]+p AftThrErrFilter (N-1).

[0086] In a feasible implementation, step A01 may include steps A10 to A20:

[0087] Step A10: Determine a second pressure difference after first-order low-pass filtering corresponding to the original value of the pressure difference between the throttle outlet target pressure and the throttle outlet actual pressure in the N-1th sampling period.

[0088] Step A20: Determine the first pressure difference after the first low-pass filtering corresponding to the original value of the pressure difference in the Nth sampling period according to the second pressure difference after the first low-pass filtering and the pressure difference filter coefficient.

[0089] It can be understood that in the above formula, p AftThrErrFilter (N-1) is the pressure difference after filtering in the N-1th sampling period, N = 1, 2, 3..., p AftThrErr The original value of the pressure difference between the throttle outlet target pressure and the throttle outlet actual pressure, p AftThrErr (N) is the pressure difference p in the Nth sampling period AftThrErr Original value, p AftThrErrFilter is the pressure difference after first-order low-pass filtering, p AftThrErrFilter (N) is the pressure difference after filtering in the Nth sampling period, p AftThrErrFilter (0) is equal to the pressure difference p at the 0th sampling period AftThrErr (0), and then calculate the first pressure difference according to the above formula. In particular, the 0th sampling period occurs when the vehicle is powered on; the sampling period interval can be 10ms in this example. K AftThrErr Coefficient: K AftThrErr =N / 4×n / 1000×k AftThrErr , k AftThrErr is the pressure difference filter coefficient, which can be taken as 0.25 in this example.

[0090] Step A02: Calculate the absolute value of the difference between the first pressure difference and the original value of the pressure difference.

[0091] Step A03: Calculate the product of the minimum of the first pressure difference and the original value of the pressure difference and the ratio limit coefficient.

[0092] Step A04: determine whether the absolute value is smaller than the product.

[0093] It is worth noting that the specific conditions for determining whether the pressure difference between the throttle outlet target pressure and the throttle outlet actual pressure is within the preset fluctuation range are as shown in the following formula:

[0094] |p AftThrErrFilter (N)-p AftThrErr (N)| <min[p AftThrErr (N), p AftThrErrFilter (N)]×r AftThrErrLim ,

[0095] If the above conditions are met from the first sampling period when the boost closed-loop condition is not met to the two sampling periods after the initial value t is reached, it means that the fluctuation of the difference between the throttle outlet target pressure and the throttle outlet actual pressure is within the preset range, where r AftThrErrLim In this example, you can take 0.1.

[0096] It can be understood that based on the above calibration basis, it is determined that t=f(r PreRatio ,n), under the same speed n, if the pressure ratio r PreRatio The smaller the value, the smaller the initial value t is, to meet the difference between the throttle outlet target pressure and the actual throttle outlet pressure p AftThrErr The fluctuation is within the preset range; PreRatio Under the same conditions, if the speed n is smaller, the initial value of time t is larger to meet the difference p between the throttle outlet target pressure and the actual throttle outlet pressure. AftThrErr The fluctuation is within the preset range.

[0097] In this embodiment, by determining the pressure ratio of the actual throttle outlet pressure to the actual throttle inlet pressure when the boost actuator exits the boost closed-loop enablement, starting from the moment the boost actuator exits the boost closed-loop enablement, it is judged whether the pressure difference between the throttle outlet target pressure and the actual throttle outlet pressure is within a preset fluctuation range; if it exceeds the preset fluctuation range, the time point at this time is used as the maintenance duration point; the duration of the preset number of sampling cycles subtracted from the maintenance duration point is used as the initial opening maintenance duration of the boost actuator, so that the maintenance duration point can be determined more accurately, thereby increasing the stability of the intake pressure and the supercharger outlet pressure.

[0098] Based on the first embodiment of the present application, in the third embodiment of the present application, the same or similar contents as those in the first embodiment can be referred to the above introduction and will not be described in detail later. Figure 4, step S20, the boost control method further includes steps S201 to S203:

[0099] Step S201: If the throttle operation control mode is the throttle full-open control mode, the optimized opening maintenance time is set to 0.

[0100] It should be noted that during the actual vehicle calibration test, when the boost actuator target opening remains unchanged after the boost closed loop enabling condition is exited, its duration will be optimized in the following situations. The first situation is if the throttle valve is requested to be fully open, that is, the throttle valve working control mode is the throttle valve fully open control mode, then the optimized opening maintenance duration is set to 0, and the boost closed loop is immediately forced to be enabled, and the boost actuator opening control under the boost closed loop enabling condition is executed. The boost actuator target opening pct BoostActuatorDsrd Execute according to the closed-loop control PID requirements.

[0101] Step S202 : If the throttle operating control mode is the throttle overshoot prevention control mode, the current maintenance duration is determined according to the preset time coefficient and the preset learning coefficient, and the current maintenance duration is used as the optimized opening maintenance duration.

[0102] It is understandable that the second case is when the throttle enters the throttle overshoot prevention control mode, then according to the preset time coefficient C1 and the preset learning coefficient r t1 Determine the current maintenance time t1, and use the current maintenance time as the optimized opening maintenance time. The boost closed loop is enabled based on the current maintenance time t1 and then exits the boost closed loop. The calculation formula for the current maintenance time t1 is as follows:

[0103] t1=C1×(1+r t1 ),

[0104] Where C1 is 0.5s, r t1 is the learning coefficient at time t1, r t1 The initial value is 0 and is retained after the vehicle is powered off. The t1 time is limited between the maximum value tmax (which can be 0.8s in this example) and the minimum value tmin (which can be 0s in this example) to avoid excessive adjustments that may lead to poor intake system control robustness.

[0105] Step S203: Otherwise, the initial opening maintaining time is used as the optimized opening maintaining time.

[0106] It should be understood that, in cases other than the first and second cases mentioned above, no special processing is performed, and the target opening of the boost actuator is 05.

[0107] In a feasible implementation manner, after step S202, steps B10 to B20 may also be included:

[0108] Step B10, recording the first actual number of times the first update condition is met in each driving cycle, wherein the first update condition is that the boost actuator exits the boost closed-loop enable, the throttle operating control mode is the throttle anti-overshoot control mode, the pressure difference between the throttle outlet target pressure and the throttle outlet actual pressure exceeds the preset fluctuation range for a continuous time exceeding a first preset time value, the actual outlet pressure fluctuation of the supercharger compressor exceeds the preset value for a continuous time exceeding a second preset time value, the ratio between the difference between the current maintenance time and the preset time coefficient and the preset time coefficient is not greater than a preset ratio, and the engine mileage in the time period from the last update of the preset learning coefficient to the current moment exceeds the preset mileage.

[0109] It should be noted that as the engine lifecycle progresses, including component aging and operational capacity considerations, the time t1 learned and updated is necessary to improve control stability due to engine production variations and component wear over different engine lifecycles. When the first update condition is met, the time t1 learning coefficient is updated.

[0110] The first update condition is that the following six conditions are met at the same time:

[0111] 1. The boost closed loop enabling condition is exited;

[0112] 2. The throttle valve enters the throttle valve overshoot prevention control mode;

[0113] 3. The difference between the throttle outlet target pressure and the actual throttle outlet pressure p AftThrErr The fluctuation is not within the preset range for a continuous time exceeding the preset value (0.2s in this example);

[0114] 4. The actual pressure fluctuation at the turbocharger compressor outlet exceeds the preset value (20kPa / 10ms in this example) for a continuous time exceeding the preset value, which is 0.35s in this example;

[0115] 5. The time (t1-C1) / C1 should not be greater than the preset value, which is 0.3 in this example. Avoid excessive adjustments.

[0116] 6. Learning coefficient r at time t1 t1 The mileage of the engine that has not been updated exceeds the preset mileage. In this example, it is 10,000 kilometers. Here, the time t1 learning coefficient r is recorded. t1 Unupdated engine mileage, learning coefficient r at time t1 t1After the update is completed, the mileage will be reset to zero, and then the corresponding vehicle mileage will be accumulated continuously. Only when the mileage exceeds the preset mileage can the time t1 learning coefficient r be updated. t1 Otherwise, the update is not allowed. The mileage in the second and third update conditions below is the same as here.

[0117] Step B20: When the first actual number of times is greater than a preset number of times, update the preset learning coefficient.

[0118] It is understood that the actual number of times CNT that the update condition is met in each driving cycle is recorded. CNT is updated at most once in each driving cycle, and CNT is immediately cleared after the learning coefficient is updated at time t1. Once CNT is greater than the preset number of times (20 in this example), it is updated immediately. When the first update condition is met, r t1 =r t1 (z)+0.2, where r t1 (z) is the learning coefficient at time t1 of the last learning update.

[0119] In a feasible implementation manner, after step S202, steps B30 to B40 may also be included:

[0120] Step B30, recording the second actual number of times the second update condition is met in each driving cycle; wherein the second update condition is that the boost actuator exits the boost closed-loop enable, the throttle operating control mode is the throttle anti-overshoot control mode, the pressure difference between the throttle outlet target pressure and the throttle outlet actual pressure is within a preset fluctuation range, the actual outlet pressure fluctuation of the supercharger compressor does not exceed a preset value, the ratio between the difference between the current maintenance time and the preset time coefficient and the preset time coefficient is greater than a preset ratio, and the engine mileage in the time period from the last update of the preset learning coefficient to the current moment exceeds the preset mileage.

[0121] It is understood that the second update condition is that the following six conditions are met at the same time:

[0122] 1. The boost closed loop enabling condition is exited;

[0123] 2. The throttle valve enters the throttle valve overshoot prevention control mode;

[0124] 3. The fluctuation of the difference between the throttle outlet target pressure and the actual throttle outlet pressure is within the preset range;

[0125] 4. The actual pressure fluctuation at the turbocharger compressor outlet does not exceed the preset value (20kPa / 10ms in this example);

[0126] 5. The time (t1-C1) / C1 is greater than the preset value, which is 0.5 in this example. Avoid excessive adjustments.

[0127] 6. Learning coefficient r at time t1 t1 The mileage of the unupdated engine exceeds the preset mileage, which is 5,000 kilometers in this example.

[0128] Step B40: When the second actual number of times is greater than the preset number of times, update the preset learning coefficient.

[0129] It is understandable that when the second update condition is met, r t1 =r t1 (z)-0.1, where r t1 (z) is the learning coefficient at time t1 of the last learning update.

[0130] In a feasible implementation manner, after step S202, steps B50 to B60 may also be included:

[0131] Step B50, recording the third actual number of times the third update condition is satisfied in each driving cycle; wherein the third update condition is that the boost actuator exits the boost closed-loop enable, the throttle operating control mode is the throttle anti-overshoot control mode, the pressure difference between the throttle outlet target pressure and the throttle outlet actual pressure is within a preset fluctuation range, the actual outlet pressure fluctuation of the supercharger compressor exceeds the preset value for a continuous time exceeding a second preset time value, the ratio between the difference between the current maintenance time and the preset time coefficient and the preset time coefficient is greater than a preset ratio, and the engine mileage in the time period from the last update of the preset learning coefficient to the current moment exceeds the preset mileage.

[0132] It is understood that the third update condition is that the following six conditions are met at the same time:

[0133] 1. The boost closed loop enabling condition is exited;

[0134] 2. The throttle valve enters the throttle valve overshoot prevention control mode;

[0135] 3. The fluctuation of the difference between the throttle outlet target pressure and the actual throttle outlet pressure is within the preset range;

[0136] 4. The actual pressure fluctuation at the turbocharger compressor outlet exceeds the preset value (20kPa / 10ms in this example) for a continuous time exceeding the preset value, which is 0.35s in this example;

[0137] 5. The time (t1-C1) / C1 is greater than the preset value, which is 0.5 in this example. Avoid excessive adjustments.

[0138] 6. Learning coefficient r at time t1 t1 The mileage of the unupdated engine exceeds the preset mileage, which is 5,000 kilometers in this example.

[0139] Step B60: When the third actual number is greater than the preset number, update the preset learning coefficient.

[0140] It should be understood that when the third update condition is met, r t1 =r t1 (z)-0.02, where r t1 (z) is the learning coefficient at time t1 of the last learning update.

[0141] It is understandable that in other cases besides the above three cases, r t1 =r t1 (z), after the time t1 learning coefficient is updated, the new time t1 learning coefficient is used for subsequent control.

[0142] In this embodiment, if the throttle working control mode is the throttle fully open control mode, the optimized opening maintenance time is set to 0; if the throttle working control mode is the throttle anti-overshoot control mode, the current maintenance time is determined according to the preset time coefficient and the preset learning coefficient, and the current maintenance time is used as the optimized opening maintenance time; otherwise, the initial opening maintenance time is used as the optimized opening maintenance time, so that the target opening maintenance time of the boost actuator can be more accurately controlled to ensure the stability of the intake pressure and the supercharger outlet pressure, and the time learning coefficient is also updated, so as to reduce the instability and inaccuracy caused by wear and aging of parts.

[0143] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the boost 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.

[0144] This application also provides a boost control device, please refer to Figure 5 , the boost control device includes:

[0145] An initial duration determination module 10 is configured to determine an initial opening maintenance duration of the boost actuator when the boost actuator exits the boost closed-loop enable state, wherein the initial opening maintenance duration is an initial value of the duration during which the actuator target opening corresponding to the boost actuator remains unchanged;

[0146] An initial duration optimization module 20 is configured to optimize the initial opening maintenance duration based on the throttle operation control mode to obtain an optimized opening maintenance duration;

[0147] The boost control module 30 is configured to perform boost control according to the optimized opening maintenance time.

[0148] The boost control device provided in this application utilizes the boost control method described in the aforementioned embodiment to address the technical problem. Compared to the prior art, the boost control device provided in this application achieves the same beneficial effects as the boost control method described in the aforementioned embodiment. Other technical features of the boost control device are the same as those disclosed in the aforementioned embodiment and are not further elaborated here.

[0149] The present application provides a boost control device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the boost control method in the above-mentioned embodiment one.

[0150] Reference below Figure 6 , which shows a schematic diagram of the structure of a boost control device suitable for implementing an embodiment of the present application. The boost 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), and in-vehicle terminals (e.g., in-vehicle navigation terminals), as well as fixed terminals such as digital TVs and desktop computers. Figure 6 The boost control device shown is merely an example and should not limit the functions and scope of use of the embodiments of the present application.

[0151] like Figure 6As shown, the boost control device may include a processing device 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes based on programs stored in a read-only memory (ROM) 1002 or programs loaded from a storage device 1003 into a random access memory (RAM) 1004. RAM 1004 also stores various programs and data required for the operation of the boost control device. Processing device 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems may be connected to I / O interface 1006: input devices 1007 including, for example, a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage device 1003 including, for example, a magnetic tape, hard disk, etc.; and communication devices 1009. Communication device 1009 can allow the boost control device to communicate with other devices wirelessly or wired to exchange data. Although the figure shows a boost control device with various systems, it should be understood that it is not required to implement or have all of the systems shown. More or fewer systems may be implemented or provided instead.

[0152] In particular, according to the embodiments disclosed in the present application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, the embodiments disclosed in the present application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program comprising program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0153] The boost control device provided in this application utilizes the boost control method described in the aforementioned embodiment to address the technical issues surrounding boost control. Compared to the prior art, the boost control device provided in this application achieves the same beneficial effects as the boost control method described in the aforementioned embodiment. Other technical features of the boost control device are the same as those disclosed in the aforementioned embodiment and are not further elaborated upon here.

[0154] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0155] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

[0156] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, a computer program) stored thereon, wherein the computer-readable program instructions are used to execute the boost control method in the above-mentioned embodiment.

[0157] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0158] The computer-readable storage medium may be included in the boost control device, or may exist independently without being assembled into the boost control device.

[0159] The above-mentioned computer-readable storage medium carries one or more programs. When the above-mentioned one or more programs are executed by the boost control device, the boost control device: determines the initial opening maintenance time of the boost actuator when the boost actuator exits the boost closed-loop enable, and the initial opening maintenance time is the initial value of the time during which the actuator target opening corresponding to the boost actuator remains unchanged; optimizes the initial opening maintenance time based on the throttle working control mode to obtain the optimized opening maintenance time; and performs boost control according to the optimized opening maintenance time.

[0160] Computer program code for performing the operations of the present application may be written in one or more programming languages, or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on the remote computer or server. In cases involving 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., through the Internet using an Internet service provider).

[0161] The flow charts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present application. In this regard, each box in the flow chart or block diagram can represent a module, program segment or a part of code, and the module, program segment or a part of 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 box can also occur in a different order than that marked in the accompanying drawings. For example, two 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 box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented by a dedicated hardware-based system that performs the specified function or operation, or can be implemented by a combination of dedicated hardware and computer instructions.

[0162] The modules described in the embodiments of the present application may be implemented in software or hardware, wherein the name of a module does not necessarily limit the unit itself.

[0163] The computer-readable storage medium provided in this application is a computer-readable storage medium storing computer-readable program instructions (i.e., a computer program) for executing the aforementioned boost control method, thereby resolving the technical problem. Compared to the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the boost control method provided in the aforementioned embodiment, and are not further elaborated here.

[0164] The present application also provides a computer program product, comprising a computer program, which implements the steps of the boost control method described above when executed by a processor.

[0165] The computer program product provided in this application can solve the technical problem. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as those of the boost control method provided in the above embodiment, which will not be elaborated here.

[0166] The above description is only part of the embodiments of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made by using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A boost control method, characterized in that: The method includes: When the boost actuator exits the boost closed loop enabling, determining the initial opening maintenance time of the boost actuator, wherein the initial opening maintenance time is an initial value of the time during which the actuator target opening corresponding to the boost actuator remains unchanged; Optimizing the initial opening maintenance time based on the throttle working control mode to obtain an optimized opening maintenance time; The boost control is performed according to the optimized opening maintenance time.

2. The method according to claim 1, characterized in that The step of determining the initial opening maintenance time of the boost actuator when the boost actuator exits the boost closed loop enablement includes: When the boost actuator exits the boost closed loop enabling, the pressure ratio between the actual throttle outlet pressure and the actual throttle inlet pressure is determined; The initial opening maintenance time of the boost actuator is determined according to the pressure ratio and the current real-time engine speed.

3. The method according to claim 2, characterized in that The step of determining the initial opening maintenance time of the boost actuator according to the pressure ratio and the current real-time engine speed comprises: Starting from the moment when the boost actuator exits the boost closed loop enabling, judging whether the pressure difference between the throttle outlet target pressure and the throttle outlet actual pressure is within a preset fluctuation range; If the pressure difference exceeds the preset fluctuation range, the time point at that time is used as the maintenance time point; The duration of the initial opening maintenance duration of the boost actuator is obtained by subtracting a preset number of sampling cycles from the maintenance duration point.

4. The method according to claim 3, characterized in that The step of determining whether the pressure difference between the throttle outlet target pressure and the throttle outlet actual pressure is within a preset fluctuation range comprises: Determine a first pressure difference after first-order low-pass filtering corresponding to an original value of the pressure difference between the throttle outlet target pressure and the throttle outlet actual pressure in the Nth sampling cycle; calculating an absolute value of a difference between the first pressure difference and an original value of the pressure difference; calculating the product of the minimum of the first pressure difference and the original value of the pressure difference and the ratio limit coefficient; It is determined whether the absolute value is smaller than the product.

5. The method according to claim 4, characterized in that The step of determining the first pressure difference after first-order low-pass filtering corresponding to the original value of the pressure difference between the throttle outlet target pressure and the throttle outlet actual pressure in the Nth sampling period comprises: Determine a second pressure difference after first-order low-pass filtering corresponding to the original value of the pressure difference between the throttle outlet target pressure and the throttle outlet actual pressure in the N-1th sampling cycle; The first pressure difference after the first-order low-pass filtering corresponding to the original value of the pressure difference in the Nth sampling period is determined according to the second pressure difference after the first-order low-pass filtering and the pressure difference filtering coefficient.

6. The method according to any one of claims 1 to 5, characterized in that The step of optimizing the initial opening maintenance time based on the throttle working control mode to obtain the optimized opening maintenance time comprises: If the throttle working control mode is the throttle full-open control mode, the optimized opening maintenance time is set to 0; If the throttle working control mode is the throttle overshoot prevention control mode, the current maintenance time is determined according to the preset time coefficient and the preset learning coefficient, and the current maintenance time is used as the optimized opening maintenance time; Otherwise, the initial opening degree maintenance time length is used as the optimized opening degree maintenance time length.

7. The method according to claim 6, characterized in that If the throttle working control mode is the throttle overshoot prevention control mode, the current maintenance duration is determined according to the preset time coefficient and the preset learning coefficient, and the current maintenance duration is used as the optimized opening maintenance duration. After that, the step also includes: Recording a first actual number of times that a first update condition is satisfied in each driving cycle; When the first actual number of times is greater than a preset number of times, updating the preset learning coefficient; Among them, the first update condition is that the boost actuator exits the boost closed loop enable, the throttle working control mode is the throttle anti-overshoot control mode, the pressure difference between the throttle outlet target pressure and the throttle outlet actual pressure exceeds the preset fluctuation range for a continuous time exceeding the first preset time value, the actual outlet pressure fluctuation of the supercharger compressor exceeds the preset value for a continuous time exceeding the second preset time value, the difference between the current maintenance time and the preset time coefficient and the ratio between the preset time coefficient is not greater than the preset ratio, and the engine mileage in the time period from the last update of the preset learning coefficient to the current moment exceeds the preset mileage.

8. The method according to claim 6, characterized in that If the throttle working control mode is the throttle overshoot prevention control mode, the current maintenance duration is determined according to the preset time coefficient and the preset learning coefficient, and the current maintenance duration is used as the optimized opening maintenance duration. After that, the step also includes: Recording a second actual number of times that a second update condition is satisfied in each driving cycle; When the second actual number is greater than a preset number, updating the preset learning coefficient; Among them, the second update condition is that the boost actuator exits the boost closed loop enable, the throttle working control mode is the throttle anti-overshoot control mode, the pressure difference between the throttle outlet target pressure and the throttle outlet actual pressure is within a preset fluctuation range, the outlet actual pressure fluctuation of the supercharger compressor does not exceed the preset value, the ratio of the difference between the current maintenance time and the preset time coefficient to the preset time coefficient is greater than the preset ratio, and the engine mileage in the time period from the last update of the preset learning coefficient to the current moment exceeds the preset mileage.

9. The method according to claim 6, characterized in that If the throttle working control mode is the throttle overshoot prevention control mode, the current maintenance duration is determined according to the preset time coefficient and the preset learning coefficient, and the current maintenance duration is used as the optimized opening maintenance duration. After that, the step also includes: Recording a third actual number of times that a third update condition is satisfied in each driving cycle; When the third actual number of times is greater than a preset number of times, updating the preset learning coefficient; Among them, the third update condition is that the boost actuator exits the boost closed loop enable, the throttle working control mode is the throttle anti-overshoot control mode, the pressure difference between the throttle outlet target pressure and the throttle outlet actual pressure is within a preset fluctuation range, the actual outlet pressure fluctuation of the supercharger compressor exceeds the preset value for a continuous time exceeding a second preset time value, the difference between the current maintenance time and the preset time coefficient and the ratio between the preset time coefficient is greater than the preset ratio, and the engine mileage in the time period from the last update of the preset learning coefficient to the current moment exceeds the preset mileage. All of the following conditions are met at the same time.

10. A boost control device, characterized in that: The boost control device comprises: An initial duration determination module, used to determine the initial opening maintenance duration of the boost actuator when the boost actuator exits the boost closed loop enable, wherein the initial opening maintenance duration is an initial value of the duration during which the actuator target opening corresponding to the boost actuator remains unchanged; An initial duration optimization module, used to optimize the initial opening maintenance duration based on the throttle working control mode to obtain an optimized opening maintenance duration; A boost control module is used to perform boost control according to the optimized opening maintenance time.

11. A boost 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 boost 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 boost control method according to any one of claims 1 to 9 are implemented.

13. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the steps of the boost control method according to any one of claims 1 to 9 are implemented.

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