Boost pressure deviation diagnosis control method, device, equipment and storage medium

Abstract

The present invention discloses a boost pressure deviation diagnosis control method, device, equipment and storage medium. The method activates boost pressure deviation fault diagnosis when it is detected that the supercharger matched with the current engine meets the boost pressure diagnosis working condition; calculates the intake pressure deviation of the current engine, and reports the boost pressure deviation fault when the intake pressure deviation exceeds a preset diagnosis threshold; determines the corresponding torque limiting control strategy according to the boost pressure deviation fault, and controls the current engine according to the torque limiting control strategy. The method can take into account the boost pressure deviation diagnosis under different superchargers and transient deviation working conditions, improves the accuracy of the boost pressure deviation diagnosis, promptly prompts the vehicle problems, and reminds the owner to repair it as soon as possible, thereby ensuring driving safety, avoiding the situation where the supercharger is damaged or the engine is destroyed during driving due to the difference in boost pressure, and improving the speed and efficiency of the boost pressure deviation diagnosis control.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control technology, and in particular to a boost pressure deviation diagnosis control method, device, equipment and storage medium. Background Art

[0002] The turbocharger is the core component of a supercharged engine. It often operates under high temperature, high load and high speed conditions, with a maximum speed of over 200,000 rpm. In addition, the automotive turbocharger has a bleed valve structure to prevent over-boosting or supercharger overspeed. Supercharger overspeed is very harmful. It will not only cause damage and failure of the supercharger impeller shaft system, but in severe cases, debris and oil will enter the cylinder and destroy the entire engine.

[0003] This is because neither boost pressure nor air flow is directly measured from the supercharger's workload, and because the engine system is complex, abnormal conditions such as intake blockage or air leakage in the boost line may cause the supercharger to overspeed. However, the supercharger speed calculated based on the boost pressure and air flow may still be within the normal range. This causes calculation and diagnosis distortion, which may lead to serious problems such as continued supercharger overspeed damage or even engine destruction due to misjudgment. Therefore, it is necessary to study and improve existing deficiencies, including the above-mentioned ones.

[0004] The existing technology mainly determines the status of the supercharger speed sensor by judging the boost pressure deviation, but cannot take into account the boost pressure deviation diagnosis of the supercharger solution without a supercharger speed sensor. It has poor compatibility with different superchargers and transient deviation conditions, lacks effective monitoring and detection methods, and is not convenient for timely maintenance of the supercharger. Summary of the Invention

[0005] The main purpose of the present invention is to provide a boost pressure deviation diagnostic control method, device, equipment and storage medium, aiming to solve the technical problems in the prior art that the boost pressure deviation diagnosis of a supercharger solution without a supercharger speed sensor cannot be taken into account, there is a lack of effective monitoring and detection means, the compatibility with different superchargers and transient deviation conditions is poor, it is not convenient to timely inspect and repair the supercharger, and it is easy to cause the supercharger to be damaged by continuous overspeed or even destroy the engine.

[0006] In a first aspect, the present invention provides a boost pressure deviation diagnosis and control method, the boost pressure deviation diagnosis and control method comprising the following steps:

[0007] When it is detected that the supercharger of the current engine meets the boost pressure diagnosis working conditions, the boost pressure deviation fault diagnosis is activated;

[0008] calculating an intake pressure deviation of the current engine, and reporting a boost pressure deviation fault when the intake pressure deviation exceeds a preset diagnostic threshold;

[0009] A corresponding torque limiting control strategy is determined according to the boost pressure deviation fault, and the current engine is controlled according to the torque limiting control strategy.

[0010] Optionally, when it is detected that the supercharger currently matched with the engine meets the boost pressure diagnosis working condition, activating the boost pressure deviation fault diagnosis includes:

[0011] When it is detected that the current state of the current engine, the engine speed, the engine torque, the supercharger position and the control mode all meet the preset diagnostic requirements, determining that the supercharger associated with the current engine meets the boost pressure diagnostic working condition;

[0012] When the supercharger meets the boost pressure diagnosis operating condition, a boost pressure deviation fault diagnosis function is activated.

[0013] Optionally, when detecting that the current state, engine speed, engine torque, supercharger position, and control mode of the current engine all meet preset diagnostic requirements, determining that the supercharger associated with the current engine meets the boost pressure diagnostic operating condition includes:

[0014] Acquiring a current state of the current engine, and when the current state is a running state and no faults that limit and affect pressure diagnosis occur, determining that the current state meets a preset diagnostic requirement;

[0015] obtaining the current engine speed of the engine, and determining that the engine speed meets the preset diagnostic requirement when the engine speed is within a preset diagnostic speed range and a speed change rate satisfies a preset speed diagnostic time;

[0016] acquiring the engine torque of the current engine, and determining that the engine torque meets the preset diagnostic requirement when the engine torque is within a preset diagnostic torque range and a torque change rate satisfies a preset torque diagnostic time;

[0017] obtaining a variable cross-section of the supercharger, and determining that a supercharger position of the supercharger meets the preset diagnostic requirement when the variable cross-section reaches a maximum protection position or a minimum protection position;

[0018] When the current engine control mode is in the combustion control mode, determining that the control mode meets the preset diagnostic requirement;

[0019] When it is detected that the current state, the engine speed, the engine torque, the supercharger position, and the control mode all meet the preset diagnostic requirements, it is determined that the supercharger associated with the current engine meets the boost pressure diagnostic operating condition.

[0020] Optionally, the calculating the intake pressure deviation of the current engine and reporting a boost pressure deviation fault when the intake pressure deviation exceeds a preset diagnostic threshold includes:

[0021] Obtaining a positive calculated value and a negative calculated value of the intake pressure of the current engine;

[0022] Calculating the intake pressure deviation of the current engine according to the intake pressure forward calculated value and the intake pressure reverse calculated value;

[0023] When the intake pressure deviation exceeds a preset diagnosis threshold, a boost pressure deviation fault is reported.

[0024] Optionally, obtaining the positive calculated value and the negative calculated value of the intake pressure of the current engine includes:

[0025] Acquiring the intake pressure of the current engine, performing temperature correction on the intake pressure using an efficiency model of the supercharger at different opening degrees, and obtaining a positive calculated value of the intake pressure;

[0026] A manifold pressure value entering the intake manifold is obtained, and an intake pressure inverse calculation value is determined by using a pressure ratio model at different throttle openings and the manifold pressure value.

[0027] Optionally, when the intake pressure deviation exceeds a preset diagnostic threshold, reporting a boost pressure deviation fault includes:

[0028] determining a preset diagnostic threshold value by using a preset diagnostic limit table and a correction coefficient, and comparing the intake pressure deviation with the preset diagnostic threshold value;

[0029] When the intake pressure deviation exceeds the preset diagnostic threshold and the anti-shake confirmation is passed, a boost pressure deviation fault is reported.

[0030] Optionally, determining a corresponding torque limit control strategy according to the boost pressure deviation fault, and controlling the current engine according to the torque limit control strategy includes:

[0031] obtaining a deviation degree of the boost pressure deviation fault;

[0032] Determine, based on the degree of deviation, to select a matching torque limiting control strategy from preset control strategies;

[0033] The current engine is controlled according to the torque limiting control strategy until the boost pressure deviation fault is eliminated.

[0034] In a second aspect, to achieve the above-mentioned object, the present invention further provides a boost pressure deviation diagnosis control device, the boost pressure deviation diagnosis control device comprising:

[0035] An activation diagnostic module is used to activate boost pressure deviation fault diagnosis when it is detected that the supercharger matched with the current engine meets the boost pressure diagnostic working condition;

[0036] a fault reporting module, configured to calculate an intake pressure deviation of the current engine and report a boost pressure deviation fault when the intake pressure deviation exceeds a preset diagnostic threshold;

[0037] The torque limit control module is configured to determine a corresponding torque limit control strategy according to the boost pressure deviation fault, and control the current engine according to the torque limit control strategy.

[0038] On the third aspect, in order to achieve the above-mentioned purpose, the present invention also proposes a boost pressure deviation diagnostic control device, which includes: a memory, a processor, and a boost pressure deviation diagnostic control program stored on the memory and executable on the processor, and the boost pressure deviation diagnostic control program is configured to implement the steps of the boost pressure deviation diagnostic control method as described above.

[0039] Fourthly, in order to achieve the above-mentioned purpose, the present invention also proposes a storage medium, on which a boost pressure deviation diagnostic control program is stored. When the boost pressure deviation diagnostic control program is executed by a processor, the steps of the boost pressure deviation diagnostic control method as described above are implemented.

[0040] The boost pressure deviation diagnosis and control method proposed in the present invention activates boost pressure deviation fault diagnosis when it is detected that the supercharger matched with the current engine meets the boost pressure diagnosis working condition; calculates the intake pressure deviation of the current engine, and reports the boost pressure deviation fault when the intake pressure deviation exceeds a preset diagnosis threshold; determines a corresponding torque limiting control strategy according to the boost pressure deviation fault, and controls the current engine according to the torque limiting control strategy. It can take into account the boost pressure deviation diagnosis under different superchargers and transient deviation working conditions, improve the accuracy of the boost pressure deviation diagnosis, promptly prompt the vehicle problems, and remind the owner to repair it as soon as possible, thereby ensuring driving safety, avoiding the damage of the supercharger and the destruction of the engine during driving due to the difference in boost pressure, and improving the speed and efficiency of the boost pressure deviation diagnosis control. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A schematic diagram of the device structure of the hardware operating environment involved in the embodiment of the present invention;

[0042] Figure 2 This is a flow chart of a first embodiment of a boost pressure deviation diagnosis and control method according to the present invention;

[0043] Figure 3 This is a flow chart of a second embodiment of a boost pressure deviation diagnosis and control method according to the present invention;

[0044] Figure 4 This is a flow chart of a third embodiment of a boost pressure deviation diagnosis and control method according to the present invention;

[0045] Figure 5 This is a flow chart of a fourth embodiment of a boost pressure deviation diagnosis and control method according to the present invention;

[0046] Figure 6 This is a functional module diagram of the first embodiment of the boost pressure deviation diagnosis and control device of the present invention.

[0047] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0048] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0049] The solution of the embodiment of the present invention mainly includes: activating boost pressure deviation fault diagnosis when detecting that the supercharger matched with the current engine meets the boost pressure diagnosis working condition; calculating the intake pressure deviation of the current engine, and reporting a boost pressure deviation fault when the intake pressure deviation exceeds a preset diagnostic threshold; determining a corresponding torque limiting control strategy based on the boost pressure deviation fault, and controlling the current engine according to the torque limiting control strategy. This can take into account the boost pressure deviation diagnosis under different supercharger and transient deviation working conditions, improve the accuracy of boost pressure deviation diagnosis, promptly indicate the vehicle problem, and prompt the owner to repair it as soon as possible, ensure driving safety, avoid the situation that the supercharger is damaged or the engine is damaged during driving due to the difference in boost pressure, and improve the speed and efficiency of boost pressure deviation diagnosis control. This solves the technical problems of the prior art that the boost pressure deviation diagnosis cannot take into account the boost pressure deviation diagnosis of supercharger solutions without supercharger speed sensors, lacks effective monitoring and detection means, has poor compatibility with different superchargers and transient deviation working conditions, is not convenient for timely supercharger repair, and is prone to damage or even damage to the engine due to continuous overspeed of the supercharger.

[0050] Reference Figure 1 , Figure 1 This is a schematic diagram of the device structure of the hardware operating environment involved in the embodiment of the present invention.

[0051] like Figure 1As shown, the device may include: a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the user interface 1003 may optionally include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a Wi-Fi interface). The memory 1005 may be a high-speed RAM memory or a stable memory (Non-Volatile Memory), such as a disk memory. The memory 1005 may optionally be a storage device independent of the aforementioned processor 1001.

[0052] Those skilled in the art will understand that Figure 1 The device structure shown in the figure does not constitute a limitation of the device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0053] like Figure 1 As shown, the memory 1005 as a storage medium may include an operating device, a network communication module, a user interface module, and a boost pressure deviation diagnosis control program.

[0054] The device of the present invention calls the boost pressure deviation diagnosis control program stored in the memory 1005 through the processor 1001 and performs the following operations:

[0055] When it is detected that the supercharger of the current engine meets the boost pressure diagnosis working conditions, the boost pressure deviation fault diagnosis is activated;

[0056] calculating an intake pressure deviation of the current engine, and reporting a boost pressure deviation fault when the intake pressure deviation exceeds a preset diagnostic threshold;

[0057] A corresponding torque limiting control strategy is determined according to the boost pressure deviation fault, and the current engine is controlled according to the torque limiting control strategy.

[0058] The device of the present invention calls the boost pressure deviation diagnosis control program stored in the memory 1005 through the processor 1001, and further performs the following operations:

[0059] When it is detected that the current state of the current engine, the engine speed, the engine torque, the supercharger position and the control mode all meet the preset diagnostic requirements, determining that the supercharger associated with the current engine meets the boost pressure diagnostic working condition;

[0060] When the supercharger meets the boost pressure diagnosis operating condition, a boost pressure deviation fault diagnosis function is activated.

[0061] The device of the present invention calls the boost pressure deviation diagnosis control program stored in the memory 1005 through the processor 1001, and further performs the following operations:

[0062] Acquiring a current state of the current engine, and when the current state is a running state and no faults that limit and affect pressure diagnosis occur, determining that the current state meets a preset diagnostic requirement;

[0063] obtaining the current engine speed of the engine, and determining that the engine speed meets the preset diagnostic requirement when the engine speed is within a preset diagnostic speed range and a speed change rate satisfies a preset speed diagnostic time;

[0064] acquiring the engine torque of the current engine, and determining that the engine torque meets the preset diagnostic requirement when the engine torque is within a preset diagnostic torque range and a torque change rate satisfies a preset torque diagnostic time;

[0065] obtaining a variable cross-section of the supercharger, and determining that a supercharger position of the supercharger meets the preset diagnostic requirement when the variable cross-section reaches a maximum protection position or a minimum protection position;

[0066] When the current engine control mode is in the combustion control mode, determining that the control mode meets the preset diagnostic requirement;

[0067] When it is detected that the current state, the engine speed, the engine torque, the supercharger position, and the control mode all meet the preset diagnostic requirements, it is determined that the supercharger associated with the current engine meets the boost pressure diagnostic operating condition.

[0068] The device of the present invention calls the boost pressure deviation diagnosis control program stored in the memory 1005 through the processor 1001, and further performs the following operations:

[0069] Obtaining a positive calculated value and a negative calculated value of the intake pressure of the current engine;

[0070] Calculating the intake pressure deviation of the current engine according to the intake pressure forward calculated value and the intake pressure reverse calculated value;

[0071] When the intake pressure deviation exceeds a preset diagnosis threshold, a boost pressure deviation fault is reported.

[0072] The device of the present invention calls the boost pressure deviation diagnosis control program stored in the memory 1005 through the processor 1001, and further performs the following operations:

[0073] Acquiring the intake pressure of the current engine, performing temperature correction on the intake pressure using an efficiency model of the supercharger at different opening degrees, and obtaining a positive calculated value of the intake pressure;

[0074] A manifold pressure value entering the intake manifold is obtained, and an intake pressure inverse calculation value is determined by using a pressure ratio model at different throttle openings and the manifold pressure value.

[0075] The device of the present invention calls the boost pressure deviation diagnosis control program stored in the memory 1005 through the processor 1001, and further performs the following operations:

[0076] determining a preset diagnostic threshold value by using a preset diagnostic limit table and a correction coefficient, and comparing the intake pressure deviation with the preset diagnostic threshold value;

[0077] When the intake pressure deviation exceeds the preset diagnostic threshold and the anti-shake confirmation is passed, a boost pressure deviation fault is reported.

[0078] The device of the present invention calls the boost pressure deviation diagnosis control program stored in the memory 1005 through the processor 1001, and further performs the following operations:

[0079] obtaining a deviation degree of the boost pressure deviation fault;

[0080] Determine, based on the degree of deviation, to select a matching torque limiting control strategy from preset control strategies;

[0081] The current engine is controlled according to the torque limiting control strategy until the boost pressure deviation fault is eliminated.

[0082] Through the above scheme, this embodiment activates the boost pressure deviation fault diagnosis when it is detected that the supercharger matched with the current engine meets the boost pressure diagnosis working condition; calculates the intake pressure deviation of the current engine, and reports the boost pressure deviation fault when the intake pressure deviation exceeds a preset diagnostic threshold; determines the corresponding torque limit control strategy according to the boost pressure deviation fault, and controls the current engine according to the torque limit control strategy. It can take into account the boost pressure deviation diagnosis under different superchargers and transient deviation working conditions, improve the accuracy of the boost pressure deviation diagnosis, promptly prompt the vehicle problems, and remind the owner to repair it as soon as possible, thereby ensuring driving safety, avoiding the damage of the supercharger and the destruction of the engine during driving due to the difference in boost pressure, and improving the speed and efficiency of the boost pressure deviation diagnosis control.

[0083] Based on the above hardware structure, an embodiment of the boost pressure deviation diagnosis and control method of the present invention is proposed.

[0084] Reference Figure 2 , Figure 21 is a flow chart of a first embodiment of a boost pressure deviation diagnosis and control method according to the present invention.

[0085] In a first embodiment, the boost pressure deviation diagnosis control method includes the following steps:

[0086] Step S10: activating boost pressure deviation fault diagnosis when it is detected that the supercharger currently matched with the engine meets the boost pressure diagnosis working condition.

[0087] It should be noted that before performing boost pressure diagnosis, it is necessary to first confirm whether the current operating conditions meet the boost pressure diagnosis conditions. When it is detected that the supercharger of the current engine meets the boost pressure diagnosis conditions, the boost pressure deviation fault diagnosis can be activated.

[0088] Step S20: Calculate the intake pressure deviation of the current engine, and report a boost pressure deviation fault when the intake pressure deviation exceeds a preset diagnostic threshold.

[0089] It should be understood that when the boost pressure deviation diagnostic condition is met, the current engine intake pressure deviation can be calculated, and then whether to report a boost pressure deviation fault can be determined based on whether the deviation exceeds a preset diagnostic threshold.

[0090] Step S30: determining a corresponding torque limiting control strategy according to the boost pressure deviation fault, and controlling the current engine according to the torque limiting control strategy.

[0091] It can be understood that the corresponding torque limiting control strategy is determined according to the boost pressure deviation fault, different boost pressure deviation faults correspond to different torque limiting control strategies, and then the current engine is controlled according to the torque limiting control strategy to eliminate the boost pressure deviation fault.

[0092] Through the above scheme, this embodiment activates the boost pressure deviation fault diagnosis when it is detected that the supercharger matched with the current engine meets the boost pressure diagnosis working condition; calculates the intake pressure deviation of the current engine, and reports the boost pressure deviation fault when the intake pressure deviation exceeds a preset diagnostic threshold; determines the corresponding torque limit control strategy according to the boost pressure deviation fault, and controls the current engine according to the torque limit control strategy. It can take into account the boost pressure deviation diagnosis under different superchargers and transient deviation working conditions, improve the accuracy of the boost pressure deviation diagnosis, promptly prompt the vehicle problems, and remind the owner to repair it as soon as possible, thereby ensuring driving safety, avoiding the damage of the supercharger and the destruction of the engine during driving due to the difference in boost pressure, and improving the speed and efficiency of the boost pressure deviation diagnosis control.

[0093] Furthermore, Figure 3 FIG. 1 is a flow chart of a second embodiment of a boost pressure deviation diagnosis and control method according to the present invention. Figure 3 As shown, a second embodiment of the boost pressure deviation diagnosis and control method of the present invention is proposed based on the first embodiment. In this embodiment, step S10 specifically includes the following steps:

[0094] Step S11: When it is detected that the current state of the current engine, the engine speed, the engine torque, the supercharger position and the control mode all meet the preset diagnostic requirements, it is determined that the supercharger matched with the current engine meets the boost pressure diagnostic working condition.

[0095] It should be noted that when it is detected that the current state of the current engine, engine speed, engine torque, supercharger position and control mode all meet the pre-set preset diagnostic requirements, it can be directly determined that the supercharger supporting the current engine meets the boost pressure diagnostic working condition.

[0096] Furthermore, the step S11 specifically includes the following steps:

[0097] Acquiring a current state of the current engine, and when the current state is a running state and no faults that limit and affect pressure diagnosis occur, determining that the current state meets a preset diagnostic requirement;

[0098] obtaining the current engine speed of the engine, and determining that the engine speed meets the preset diagnostic requirement when the engine speed is within a preset diagnostic speed range and a speed change rate satisfies a preset speed diagnostic time;

[0099] acquiring the engine torque of the current engine, and determining that the engine torque meets the preset diagnostic requirement when the engine torque is within a preset diagnostic torque range and a torque change rate satisfies a preset torque diagnostic time;

[0100] obtaining a variable cross-section of the supercharger, and determining that a supercharger position of the supercharger meets the preset diagnostic requirement when the variable cross-section reaches a maximum protection position or a minimum protection position;

[0101] When the current engine control mode is in the combustion control mode, determining that the control mode meets the preset diagnostic requirement;

[0102] When it is detected that the current state, the engine speed, the engine torque, the supercharger position, and the control mode all meet the preset diagnostic requirements, it is determined that the supercharger associated with the current engine meets the boost pressure diagnostic operating condition.

[0103] It can be understood that the engine is in a running state and there is no fault that limits the impact on pressure diagnosis, so this state is considered to be in compliance.

[0104] In the specific implementation, the diagnostic speed range can be set according to the engine operating range; the engine speed change rate: through high-pass filtering, a relatively stable speed operating condition is screened out; and a delay time is set. After the speed range and change rate meet a certain time, this state is met.

[0105] It can be understood that the required torque range for diagnosis is set according to the engine operating range; engine torque change: relatively stable torque operating conditions are screened out through high-pass filtering; and the delay time is set. After the torque range and change rate meet a certain time, this state is met.

[0106] It should be understood that for an adjustable cross-section supercharger, when there is a boost pressure deviation, the variable cross-section meets the closed-loop requirement of the boost pressure through closed-loop control. When the variable cross-section reaches the maximum or minimum protection position, it is considered that the supercharger has reached the maximum closed-loop control capability, and this state is met.

[0107] It should be noted that when the current engine control mode is in the combustion control mode, it is determined that the control mode meets the preset diagnostic requirements. When all the above conditions are met, it can be determined that the boost pressure diagnostic conditions are met, and the boost pressure deviation fault diagnosis can be activated at this time.

[0108] Step S12: activating a boost pressure deviation fault diagnosis function when the supercharger meets the boost pressure diagnosis working condition.

[0109] It is understandable that when the supercharger meets the boost pressure diagnosis working condition, the boost pressure deviation fault diagnosis function can be activated to perform a fault diagnosis operation.

[0110] Through the above scheme, this embodiment determines that the supercharger supporting the current engine meets the boost pressure diagnostic working condition when it detects that the current state of the current engine, engine speed, engine torque, supercharger position and control mode all meet the preset diagnostic requirements; when the supercharger meets the boost pressure diagnostic working condition, the boost pressure deviation fault diagnosis function is activated; the fault diagnosis function can be quickly activated, thereby improving the accuracy of the boost pressure deviation fault diagnosis and improving the speed and efficiency of the boost pressure deviation diagnostic control.

[0111] Furthermore, Figure 4 FIG. 1 is a flow chart of a third embodiment of a boost pressure deviation diagnosis and control method according to the present invention. Figure 4 As shown, a third embodiment of the boost pressure deviation diagnosis and control method of the present invention is proposed based on the first embodiment. In this embodiment, step S20 specifically includes the following steps:

[0112] Step S21: Obtain the positive calculated value and the reverse calculated value of the intake pressure of the current engine.

[0113] It should be noted that after the boost pressure deviation diagnosis conditions are met, the intake pressure forward value of the current engine can be calculated based on the intake pressure forward calculation model, and the intake pressure reverse value of the current engine can be calculated based on the intake pressure reverse calculation model.

[0114] Furthermore, the step S21 specifically includes the following steps:

[0115] Acquiring the intake pressure of the current engine, performing temperature correction on the intake pressure using an efficiency model of the supercharger at different opening degrees, and obtaining a positive calculated value of the intake pressure;

[0116] A manifold pressure value entering the intake manifold is obtained, and an intake pressure inverse calculation value is determined by using a pressure ratio model at different throttle openings and the manifold pressure value.

[0117] In the specific implementation, the intake pressure positive calculation model P 11 :According to the intake pressure entering the engine, through the efficiency model of the supercharger compressor at different openings, combined with temperature correction, the positive value of the supercharger intake pressure is estimated; the intake pressure reverse calculation model P 21 : Based on the intake manifold pressure value and the pressure ratio model at different throttle openings, the inverse calculation model of the intake pressure is estimated.

[0118] Step S22: Calculate the intake pressure deviation of the current engine according to the intake pressure forward calculated value and the intake pressure reverse calculated value.

[0119] It can be understood that the intake pressure deviation of the current engine can be obtained by calculating the difference between the positive intake pressure value and the reverse intake pressure value.

[0120] In a specific implementation, the intake pressure deviation P error =P 11 -P 21 ,

[0121] P error A positive value means that the actual boost pressure is less than the model value, and the boost pressure is insufficient;

[0122] P error A negative value means that the actual boost pressure is greater than the model value, and the boost pressure exceeds the required boost pressure;

[0123] For P error In the case of positive and negative values, the diagnostic limits are also divided into two MAP tables: diagnostic limits: different diagnostic limits are set according to the deviations in different speed / torque operating conditions, and confirmed according to the regional diagnostic limits;

[0124] A sample table of diagnostic limits is shown below:

[0125] Speed / torque 600 1000 1400 1600 2000 300 70 75 80 85 90 1000 2000

[0126] Step S23: When the intake pressure deviation exceeds a preset diagnosis threshold, a boost pressure deviation fault is reported.

[0127] It should be understood that when the intake pressure deviation exceeds a preset diagnosis threshold, a boost pressure deviation fault may be reported in a timely manner.

[0128] Furthermore, the step S23 specifically includes the following steps:

[0129] determining a preset diagnostic threshold value by using a preset diagnostic limit table and a correction coefficient, and comparing the intake pressure deviation with the preset diagnostic threshold value;

[0130] When the intake pressure deviation exceeds the preset diagnostic threshold and the anti-shake confirmation is passed, a boost pressure deviation fault is reported.

[0131] It can be understood that the preset diagnostic threshold is determined by the preset diagnostic limit table and the correction coefficient. After comparing the intake pressure deviation with the preset diagnostic threshold, a fault report can be performed when the intake pressure deviation exceeds the preset diagnostic threshold and the anti-shake confirmation is passed.

[0132] In specific implementation, the vehicle operates in multiple environmental states. When operating in different environmental states, there will be a certain deviation in the boost pressure. The boost pressure correction is set according to the ambient temperature and atmospheric pressure.

[0133] An example table of ambient temperature correction is shown below:

[0134] Ambient temperature -30 -10 10 30 50 Diagnostic bias coefficient 1.05 1.02 1 0.97 0.95

[0135] An example table of atmospheric pressure corrections is shown below:

[0136] atmospheric pressure 55 72 82 100 105 Diagnostic bias coefficient 0.92 0.95 0.98 1 1

[0137] When P error When the limit value after the weighted correction coefficient in the diagnostic limit table* is exceeded, a corresponding fault of the boost pressure will be reported after a certain period of anti-shake confirmation.

[0138] This embodiment adopts the above scheme, by obtaining the positive calculated value and the inverse calculated value of the intake pressure of the current engine; calculating the intake pressure deviation of the current engine according to the positive calculated value and the inverse calculated value of the intake pressure; reporting the boost pressure deviation fault when the intake pressure deviation exceeds the preset diagnostic threshold, which can take into account the boost pressure deviation diagnosis under different superchargers and transient deviation conditions, improve the accuracy of the boost pressure deviation diagnosis, promptly prompt the vehicle problems, remind the owner to repair it as soon as possible, and ensure driving safety.

[0139] Furthermore, Figure 5 FIG. 4 is a flow chart of a fourth embodiment of a boost pressure deviation diagnosis and control method according to the present invention. Figure 5 As shown, a fourth embodiment of the boost pressure deviation diagnosis and control method of the present invention is proposed based on the first embodiment. In this embodiment, step S30 specifically includes the following steps:

[0140] Step S31: Obtain the deviation degree of the boost pressure deviation fault.

[0141] It should be noted that after the boost pressure deviation fault is determined, the deviation degree of the boost pressure deviation fault may be obtained.

[0142] Step S32: Determine, based on the degree of deviation, to select a matching torque limiting control strategy from the preset control strategies.

[0143] It is understandable that, according to the degree of deviation, a matching torque limiting control strategy can be selected from the preset control strategies, and different degrees of deviation correspond to different torque limiting control forces.

[0144] In a specific implementation, after a fault is reported, a torque limiting action can be performed according to a preset safety protection strategy, that is, a preset control strategy. The boost pressure deviation is a negative value, which means that the actual boost pressure value is greater than the model value, and the boost pressure exceeds the required boost pressure. At this time, it will cause the pressure of some automobile parts, such as pipelines, to exceed their own tolerance pressure, which is prone to pipe bursting. Therefore, the output torque is adjusted by limiting, for example, the output torque is limited from the original 3000 Nm to 2000 Nm. At this time, the engine speed will also be reduced accordingly, avoiding the risk of broken shaft. Of course, the speed of the supercharger can also be affected by limiting the intake flow rate, which is not limited in this embodiment.

[0145] Step S33: Control the current engine according to the torque limiting control strategy until the boost pressure deviation fault is eliminated.

[0146] It should be understood that the current engine may be controlled according to the torque limiting control strategy until the boost pressure deviation fault is eliminated.

[0147] In specific implementation, the boost pressure diagnosis is a continuous diagnosis during vehicle operation. When the boost pressure deviation is detected to be within the diagnostic limit range, after a period of time, it is considered that the fault has been repaired and the torque limit and other protection actions are exited.

[0148] Through the above-mentioned scheme, this embodiment obtains the deviation degree of the boost pressure deviation fault; determines to select a matching torque limiting control strategy from preset control strategies based on the deviation degree; and controls the current engine according to the torque limiting control strategy until the boost pressure deviation fault is eliminated. This embodiment can take into account the boost pressure deviation diagnosis under different superchargers and transient deviation conditions, improve the accuracy of the boost pressure deviation diagnosis, promptly indicate the existing vehicle problems, and remind the owner to repair them as soon as possible, thereby ensuring driving safety, avoiding the damage of the supercharger or the destruction of the engine during driving due to the difference in boost pressure, and improving the speed and efficiency of the boost pressure deviation diagnosis control.

[0149] Accordingly, the present invention further provides a boost pressure deviation diagnosis control device.

[0150] Reference Figure 6 , Figure 6 This is a functional module diagram of the first embodiment of the boost pressure deviation diagnosis and control device of the present invention.

[0151] In a first embodiment of the boost pressure deviation diagnosis control device of the present invention, the boost pressure deviation diagnosis control device includes:

[0152] The activation diagnosis module 10 is used to activate the boost pressure deviation fault diagnosis when it is detected that the supercharger matched with the current engine meets the boost pressure diagnosis working condition.

[0153] The fault reporting module 20 is configured to calculate the intake pressure deviation of the current engine and report a boost pressure deviation fault when the intake pressure deviation exceeds a preset diagnostic threshold.

[0154] The torque limit control module 30 is configured to determine a corresponding torque limit control strategy according to the boost pressure deviation fault, and control the current engine according to the torque limit control strategy.

[0155] The activation diagnostic module 10 is also used to determine that the supercharger supporting the current engine meets the boost pressure diagnostic working condition when it detects that the current state, engine speed, engine torque, supercharger position and control mode of the current engine all meet the preset diagnostic requirements; when the supercharger meets the boost pressure diagnostic working condition, activate the boost pressure deviation fault diagnosis function.

[0156] The activation diagnostic module 10 is further configured to obtain a current state of the current engine, and determine that the current state meets the preset diagnostic requirements when the current state is an operating state and no faults that limit pressure diagnosis occur; obtain an engine speed of the current engine, and determine that the engine speed meets the preset diagnostic requirements when the engine speed is within a preset diagnostic speed range and the speed change rate meets a preset speed diagnostic time; obtain an engine torque of the current engine, and determine that the engine torque meets the preset diagnostic requirements when the engine torque is within a preset diagnostic torque range and the torque change rate meets a preset torque diagnostic time; obtain a variable cross-section of the supercharger, and determine that the supercharger position of the supercharger meets the preset diagnostic requirements when the variable cross-section reaches a maximum protection position or a minimum protection position; and determine that the control mode of the current engine meets the preset diagnostic requirements when the control mode of the current engine is a combustion control mode. When it is detected that the current state, the engine speed, the engine torque, the supercharger position, and the control mode all meet the preset diagnostic requirements, it is determined that the supercharger associated with the current engine meets the boost pressure diagnostic operating condition.

[0157] The fault reporting module 20 is also used to obtain the positive value and the reverse value of the intake pressure of the current engine; calculate the intake pressure deviation of the current engine based on the positive value and the reverse value of the intake pressure; and report the boost pressure deviation fault when the intake pressure deviation exceeds a preset diagnostic threshold.

[0158] The fault reporting module 20 is also used to obtain the intake pressure entering the current engine, perform temperature correction on the intake pressure through the efficiency model of the supercharger at different openings, and obtain a positive value of the intake pressure; obtain the manifold pressure value entering the intake manifold, and determine the inverse value of the intake pressure through the pressure ratio model at different throttle openings and the manifold pressure value.

[0159] The fault reporting module 20 is further configured to determine a preset diagnostic threshold value through a preset diagnostic limit table and a correction coefficient, and compare the intake pressure deviation with the preset diagnostic threshold value; and report a boost pressure deviation fault when the intake pressure deviation exceeds the preset diagnostic threshold value and anti-shake confirmation is passed.

[0160] The torque limit control module 30 is further configured to obtain a degree of deviation of the boost pressure deviation fault; determine a matching torque limit control strategy from preset control strategies based on the degree of deviation; and control the current engine according to the torque limit control strategy until the boost pressure deviation fault is eliminated.

[0161] The steps implemented by the functional modules of the boost pressure deviation diagnosis and control device may refer to the various embodiments of the boost pressure deviation diagnosis and control method of the present invention, and will not be described in detail here.

[0162] In addition, an embodiment of the present invention further provides a storage medium, wherein a boost pressure deviation diagnosis control program is stored on the storage medium. When the boost pressure deviation diagnosis control program is executed by a processor, the following operations are implemented:

[0163] When it is detected that the supercharger of the current engine meets the boost pressure diagnosis working conditions, the boost pressure deviation fault diagnosis is activated;

[0164] calculating an intake pressure deviation of the current engine, and reporting a boost pressure deviation fault when the intake pressure deviation exceeds a preset diagnostic threshold;

[0165] A corresponding torque limiting control strategy is determined according to the boost pressure deviation fault, and the current engine is controlled according to the torque limiting control strategy.

[0166] Furthermore, when the boost pressure deviation diagnosis control program is executed by the processor, the following operations are also implemented:

[0167] When it is detected that the current state of the current engine, the engine speed, the engine torque, the supercharger position and the control mode all meet the preset diagnostic requirements, determining that the supercharger associated with the current engine meets the boost pressure diagnostic working condition;

[0168] When the supercharger meets the boost pressure diagnosis operating condition, a boost pressure deviation fault diagnosis function is activated.

[0169] Furthermore, when the boost pressure deviation diagnosis control program is executed by the processor, the following operations are also implemented:

[0170] Acquiring a current state of the current engine, and when the current state is a running state and no faults that limit and affect pressure diagnosis occur, determining that the current state meets a preset diagnostic requirement;

[0171] obtaining the current engine speed of the engine, and determining that the engine speed meets the preset diagnostic requirement when the engine speed is within a preset diagnostic speed range and a speed change rate satisfies a preset speed diagnostic time;

[0172] acquiring the engine torque of the current engine, and determining that the engine torque meets the preset diagnostic requirement when the engine torque is within a preset diagnostic torque range and a torque change rate satisfies a preset torque diagnostic time;

[0173] obtaining a variable cross-section of the supercharger, and determining that a supercharger position of the supercharger meets the preset diagnostic requirement when the variable cross-section reaches a maximum protection position or a minimum protection position;

[0174] When the current engine control mode is in the combustion control mode, determining that the control mode meets the preset diagnostic requirement;

[0175] When it is detected that the current state, the engine speed, the engine torque, the supercharger position, and the control mode all meet the preset diagnostic requirements, it is determined that the supercharger associated with the current engine meets the boost pressure diagnostic operating condition.

[0176] Furthermore, when the boost pressure deviation diagnosis control program is executed by the processor, the following operations are also implemented:

[0177] Obtaining a positive calculated value and a negative calculated value of the intake pressure of the current engine;

[0178] Calculating the intake pressure deviation of the current engine according to the intake pressure forward calculated value and the intake pressure reverse calculated value;

[0179] When the intake pressure deviation exceeds a preset diagnosis threshold, a boost pressure deviation fault is reported.

[0180] Furthermore, when the boost pressure deviation diagnosis control program is executed by the processor, the following operations are also implemented:

[0181] Acquiring the intake pressure of the current engine, performing temperature correction on the intake pressure using an efficiency model of the supercharger at different opening degrees, and obtaining a positive calculated value of the intake pressure;

[0182] A manifold pressure value entering the intake manifold is obtained, and an intake pressure inverse calculation value is determined by using a pressure ratio model at different throttle openings and the manifold pressure value.

[0183] Furthermore, when the boost pressure deviation diagnosis control program is executed by the processor, the following operations are also implemented:

[0184] determining a preset diagnostic threshold value by using a preset diagnostic limit table and a correction coefficient, and comparing the intake pressure deviation with the preset diagnostic threshold value;

[0185] When the intake pressure deviation exceeds the preset diagnostic threshold and the anti-shake confirmation is passed, a boost pressure deviation fault is reported.

[0186] Furthermore, when the boost pressure deviation diagnosis control program is executed by the processor, the following operations are also implemented:

[0187] obtaining a deviation degree of the boost pressure deviation fault;

[0188] Determine, based on the degree of deviation, to select a matching torque limiting control strategy from preset control strategies;

[0189] The current engine is controlled according to the torque limiting control strategy until the boost pressure deviation fault is eliminated.

[0190] Those skilled in the art will understand that all or part of the steps in the above-mentioned implementation method can be completed by instructing related hardware through a program. The program is stored in a storage medium and includes a number of instructions for enabling a device (which can be a single-chip microcomputer, chip, etc.) or a processor to execute all or part of the steps of the method described in each embodiment of the present application; and the aforementioned storage medium is a computer-readable storage medium, including: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program codes.

[0191] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0192] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0193] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A boost pressure deviation diagnosis and control method, characterized in that: The boost pressure deviation diagnosis and control method includes: When it is detected that the supercharger of the current engine meets the boost pressure diagnosis working conditions, the boost pressure deviation fault diagnosis is activated; calculating an intake pressure deviation of the current engine, and reporting a boost pressure deviation fault when the intake pressure deviation exceeds a preset diagnostic threshold; determining a corresponding torque limiting control strategy according to the boost pressure deviation fault, and controlling the current engine according to the torque limiting control strategy; The calculating of the intake pressure deviation of the current engine and reporting a boost pressure deviation fault when the intake pressure deviation exceeds a preset diagnostic threshold value includes: Obtaining a positive calculated value and a negative calculated value of the intake pressure of the current engine; Calculating the intake pressure deviation of the current engine according to the intake pressure forward calculated value and the intake pressure reverse calculated value; When the intake pressure deviation exceeds a preset diagnostic threshold, reporting a boost pressure deviation fault; The step of obtaining the positive calculated value and the reverse calculated value of the intake pressure of the current engine includes: Acquiring the intake pressure of the current engine, performing temperature correction on the intake pressure using an efficiency model of the supercharger at different opening degrees, and obtaining a positive calculated value of the intake pressure; A manifold pressure value entering the intake manifold is obtained, and an intake pressure inverse calculation value is determined by using a pressure ratio model at different throttle openings and the manifold pressure value.

2. The boost pressure deviation diagnosis and control method according to claim 1, wherein: When it is detected that the supercharger matched with the current engine meets the boost pressure diagnosis working condition, activating the boost pressure deviation fault diagnosis includes: When it is detected that the current state of the current engine, the engine speed, the engine torque, the supercharger position and the control mode all meet the preset diagnostic requirements, determining that the supercharger associated with the current engine meets the boost pressure diagnostic working condition; When the supercharger meets the boost pressure diagnosis operating condition, a boost pressure deviation fault diagnosis function is activated.

3. The boost pressure deviation diagnosis and control method according to claim 2, wherein: When it is detected that the current state of the current engine, the engine speed, the engine torque, the supercharger position, and the control mode all meet the preset diagnostic requirements, determining that the supercharger associated with the current engine meets the boost pressure diagnostic working condition includes: Acquiring a current state of the current engine, and when the current state is a running state and no faults that limit and affect pressure diagnosis occur, determining that the current state meets a preset diagnostic requirement; obtaining the current engine speed of the engine, and determining that the engine speed meets the preset diagnostic requirement when the engine speed is within a preset diagnostic speed range and a speed change rate satisfies a preset speed diagnostic time; acquiring the engine torque of the current engine, and determining that the engine torque meets the preset diagnostic requirement when the engine torque is within a preset diagnostic torque range and a torque change rate satisfies a preset torque diagnostic time; obtaining a variable cross-section of the supercharger, and determining that a supercharger position of the supercharger meets the preset diagnostic requirement when the variable cross-section reaches a maximum protection position or a minimum protection position; When the current engine control mode is in the combustion control mode, determining that the control mode meets the preset diagnostic requirement; When it is detected that the current state, the engine speed, the engine torque, the supercharger position, and the control mode all meet the preset diagnostic requirements, it is determined that the supercharger associated with the current engine meets the boost pressure diagnostic operating condition.

4. The boost pressure deviation diagnosis and control method according to claim 1, wherein: When the intake pressure deviation exceeds a preset diagnostic threshold, reporting a boost pressure deviation fault includes: determining a preset diagnostic threshold value by using a preset diagnostic limit table and a correction coefficient, and comparing the intake pressure deviation with the preset diagnostic threshold value; When the intake pressure deviation exceeds the preset diagnostic threshold and the anti-shake confirmation is passed, a boost pressure deviation fault is reported.

5. The boost pressure deviation diagnosis and control method according to claim 1, wherein: Determining a corresponding torque limiting control strategy according to the boost pressure deviation fault, and controlling the current engine according to the torque limiting control strategy, includes: obtaining a deviation degree of the boost pressure deviation fault; Determine, based on the degree of deviation, to select a matching torque limiting control strategy from preset control strategies; The current engine is controlled according to the torque limiting control strategy until the boost pressure deviation fault is eliminated.

6. A boost pressure deviation diagnosis and control device, characterized in that: The boost pressure deviation diagnosis control device includes: An activation diagnostic module is used to activate boost pressure deviation fault diagnosis when it is detected that the supercharger matched with the current engine meets the boost pressure diagnostic working condition; a fault reporting module, configured to calculate an intake pressure deviation of the current engine and report a boost pressure deviation fault when the intake pressure deviation exceeds a preset diagnostic threshold; a torque limit control module, configured to determine a corresponding torque limit control strategy according to the boost pressure deviation fault, and control the current engine according to the torque limit control strategy; The fault reporting module is further configured to obtain a positive calculated intake pressure value and a negative calculated intake pressure value of the current engine; calculate an intake pressure deviation of the current engine based on the positive calculated intake pressure value and the negative calculated intake pressure value; and report a boost pressure deviation fault when the intake pressure deviation exceeds a preset diagnostic threshold; The fault reporting module is further used to obtain the intake pressure entering the current engine, perform temperature correction on the intake pressure through the efficiency model of the supercharger at different openings, and obtain a positive value of the intake pressure; obtain the manifold pressure value entering the intake manifold, and determine the inverse value of the intake pressure through the pressure ratio model at different throttle openings and the manifold pressure value.

7. A boost pressure deviation diagnosis and control device, characterized in that: The boost pressure deviation diagnostic control device includes: a memory, a processor, and a boost pressure deviation diagnostic control program stored in the memory and executable on the processor, wherein the boost pressure deviation diagnostic control program is configured to implement the steps of the boost pressure deviation diagnostic control method according to any one of claims 1 to 5.

8. A storage medium, characterized in that: The storage medium stores a boost pressure deviation diagnosis control program, which, when executed by the processor, implements the steps of the boost pressure deviation diagnosis control method according to any one of claims 1 to 5.

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