Method and system for detecting and handling automatic transmission pressure filter clogging failure

Abstract

The application discloses an automatic transmission pressure filter blockage fault detection and processing method and system, comprising the following steps: S1: calculating a pressure filter blockage fault flag bit Fail filter ; S2: calculating a pressure filter blockage fault trigger pressure P b ; S3: calculating a main oil pressure lifting offset P off_L based on the pressure filter blockage fault flag bit Fail filter , a clutch target pressure P tgt_cl and the pressure filter blockage fault trigger pressure P b ; S4: calculating a main oil pressure basic value P base_L , and calculating a main oil pressure command pressure P demand_L according to the main oil pressure basic value P base_L and the main oil pressure lifting offset P off_L . The application can detect and process the automatic transmission pressure filter blockage fault in real time, protects the transmission hardware and improves the vehicle driving comfort, and prolongs the service life of the pressure filter.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of automatic transmission control, and particularly relates to an automatic transmission pressure filter blockage fault detection and processing method and system. BACKGROUND

[0002] During production, assembly and use, impurities such as aluminum chips, iron chips and non-metallic particles inevitably remain in the transmission system. In order to better protect the hydraulic elements such as the oil pump and the electromagnetic valve, the automatic transmission usually simultaneously sets filters on the oil suction circuit and the pressure oil circuit. After the impurities in the transmission system are filtered by the oil suction filter, some fine impurities reach the pressure filter through the oil pump and adhere to the filter screen. With the increase of mileage, the impurities on the filter screen continuously accumulate, the effective filtering area of the filter continuously decreases, and the pressure loss between the front and rear ends of the filter when the main oil circuit of the transmission flows through the pressure filter becomes larger and larger, thereby affecting the pressure and flow control of the subsequent clutch and gear shifting branch oil circuit, which can cause engine flying and gear shifting failure and other fault phenomena, seriously affecting the vehicle driving comfort, and individual transmission may also have serious functional failure such as clutch ablation.

[0003] Therefore, it is necessary to develop an automatic transmission pressure filter blockage fault detection and processing method and system. SUMMARY

[0004] The application aims to provide an automatic transmission pressure filter blockage fault detection and processing method and system, which can detect and process the automatic transmission pressure filter blockage fault in real time, protect the transmission hardware, improve the vehicle driving comfort, and prolong the service life of the pressure filter.

[0005] In a first aspect, the application provides an automatic transmission pressure filter blockage fault detection and processing method, which comprises the following steps:

[0006] S1: calculating a pressure filter blockage fault flag Fail filter ;

[0007] S2: calculating a pressure filter blockage fault trigger pressure P b ;

[0008] S3: calculating a main oil pressure increase offset P filter based on the pressure filter blockage fault flag Fail tgt_cl , a clutch target pressure P b , and a pressure filter blockage fault trigger pressure P off_ ;

[0009] S4: calculating a main oil pressure basic value P base_, according to the master oil pressure basic value P base_L and the master oil pressure boost offset P off_ , the master oil pressure command pressure P demand_L is calculated.

[0010] Optionally, the step S1 is specifically:

[0011] S11: judging whether the clutch has a pressure following fault, specifically including the following determination conditions:

[0012] Condition 1: the master oil pressure solenoid is fault-free;

[0013] Condition 2: the clutch solenoid is fault-free;

[0014] Condition 3: the clutch pressure sensor is fault-free;

[0015] Condition 4: the difference ΔP between the clutch target pressure P tgt_cl and the first set pressure threshold is greater than 0;

[0016] Condition 5: the difference ΔP between the clutch actual pressure P act_cl and the second set pressure threshold is greater than 0;

[0017] Condition 6: the difference ΔP between the clutch target pressure P act_cl and the actual pressure is greater than the set pressure difference threshold ΔP max ;

[0018] When all the above conditions are met, it is determined that the clutch has a pressure following fault, the clutch pressure following fault flag PFail cl is 1, and if not, the clutch pressure following fault flag PFail cl is 0.

[0019] S12: when the clutch pressure following fault flag PFail cl is 1, it is determined that the pressure filter has a blockage fault, the pressure filter blockage fault flag Fail filter is 1, and if the clutch pressure following fault flag PFail cl is 0, the pressure filter blockage fault flag Fail filter remains unchanged.

[0020] Optionally, the step S2 is specifically:

[0021] S21: judging whether the pressure filter blockage fault flag Fail filter is 1, if yes, executing step S22, and if not, recording the clutch target pressure P tgt_cl as the pressure filter blockage fault trigger pressure P b , i.e. P b =Ptgt_cl ;

[0022] S22: judging clutch pressure follow-up fault flag bit PFail cl whether it changes from 0 to 1, if yes, executing step S23, if no, executing step S24;

[0023] S23: judging clutch target pressure P tgt_cl whether it is less than previous task cycle pressure filter blockage fault trigger pressure P b_z , if yes, recording clutch target pressure P tgt_cl as new pressure filter blockage fault trigger pressure P b , i.e. P b = P tgt_cl , if no, executing step S24;

[0024] S24: pressure filter blockage fault trigger pressure P b remains unchanged, i.e. P b = P b_z .

[0025] Optionally, the step 3 is specifically:

[0026] S31: judging whether pressure filter blockage fault flag bit Fail filter is 0, if yes, setting main oil pressure boost offset P off_L to 0, if no, executing step S32;

[0027] S32: judging whether clutch target pressure P tgt_cl is greater than pressure filter blockage fault trigger pressure P b , if yes, cumulatively increasing main oil pressure boost offset P Inc by a set boost step size δ off_L until main oil pressure boost offset P off_L reaches a set maximum main oil pressure boost offset threshold, if no, executing step S33;

[0028] S33: cumulatively decreasing main oil pressure boost offset P Dec by a set de-boost step size δ off_L until main oil pressure boost offset P off_L decreases to 0.

[0029] Optionally, in the step S4, calculating main oil pressure base value P base_L is specifically:

[0030] S41: determining first base value P tgt_cli of main oil pressure according to transmission torque clutch target pressure P base_L1 ;

[0031] S42: Calculate the required pressure P of the torque transmission clutch based on the driver's requested torque and the clutch PT curve, by referring to a table. Eng_cli And as the second base value P of the main oil pressure. base_L2 ;

[0032] S43: Set the third base value P of the main hydraulic pressure according to the overall vehicle driving status. base_L3 ;

[0033] S44: Based on the target pressure P for shifting the shift fork. tgt_syni Determine the fourth basic value P of the main oil pressure. base_L4 ;

[0034] S45: Calculate the main hydraulic pressure base offset P by referring to the table based on the transmission oil temperature and the main hydraulic pressure base offset characteristic curve. baseoff_L ;

[0035] S46: Based on the first baseline value P of the main oil pressure base_L1 Second basic value P base_L2 The third basic value P base_L3 The fourth fundamental value P base_L4 and main hydraulic base offset P baseoff_L Calculate the base value of main oil pressure P base_L .

[0036] Optionally, in step S41, if two clutches transmit torque simultaneously, the larger of the target pressures of the two torque-transmitting clutches is taken as the first base value P of the main oil pressure. base_L1 .

[0037] Optionally, in step S42, if two clutches transmit torque simultaneously, the larger of the required pressures of the two torque-transmitting clutches is taken as the second base value P of the main oil pressure. base_L2 .

[0038] Optionally, in S46, the main oil pressure base value P base_L The calculation formula is as follows:

[0039] P base_L =max(P base_L1 P base_L2 P base_L3 P base_L4 )+P baseoff_L .

[0040] Optionally, in step S4, based on the main oil pressure baseline value P base_L and main oil pressure boost offset P off_L Calculate the main hydraulic pressure command pressure P demand_L Specifically: P demand_L =P base_L +P off_L.

[0041] In a second aspect, the application provides an automatic transmission pressure filter clogging fault detection and processing system, comprising a controller and a memory, wherein the memory stores a computer readable program, and when the computer readable program is called by the controller, the steps of the automatic transmission pressure filter clogging fault detection and processing method described in the application can be executed.

[0042] The application has the following advantages: the application first determines whether the pressure filter has a clogging fault, and if the pressure filter is detected to have a clogging fault, the main oil pressure of the transmission dry circuit is gradually increased, so as to increase the pressure difference between the inlet and outlet of the pressure filter, enhance the filter flow capacity, increase the inlet pressure of the clutch pressure control valve, and gradually reduce the difference between the target pressure and the actual pressure of the clutch until the difference is completely eliminated, thereby improving the clutch pressure and torque control accuracy and avoiding engine flywheel and clutch ablation. The application protects the transmission hardware and improves the driving comfort of the vehicle, and to some extent, also prolongs the service life of the pressure filter. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the application, and therefore should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0044] Figure 1 It is an automatic transmission oil circuit schematic diagram in the embodiment;

[0045] Figure 2 It is a main step flowchart of the embodiment;

[0046] Figure 3 It is a flowchart of the embodiment;

[0047] In the figure: 1. oil suction filter, 2. oil pump, 3. main oil pressure electromagnetic valve, 4. first clutch electromagnetic valve, 5. first clutch pressure sensor, 6. second clutch electromagnetic valve, 7. second clutch pressure sensor, 8. pressure filter, 9. pressure filter bypass valve, 10. shift electromagnetic valve. DETAILED DESCRIPTION

[0048] The application will be described in detail below with reference to the drawings.

[0049] As Figure 1As shown, in this embodiment, the automatic transmission hydraulic system includes an oil suction filter 1, an oil pump 2, a main oil pressure solenoid valve 3, a first clutch solenoid valve 4, a first clutch pressure sensor 5, a second clutch solenoid valve 6, a second clutch pressure sensor 7, a pressure filter 8, a pressure filter bypass valve 9, and a shift solenoid valve 10. The oil suction filter 1 is used for rough filtration of the oil to adsorb larger impurities in the oil and protect the hydraulic oil pump. The oil pump 2 is used to provide system flow for the automatic transmission. The main oil pressure solenoid valve 3 is located at the front end of the pressure filter 8 and controls the main oil path pressure to provide inlet pressure for each branch oil path. The first clutch solenoid valve 4 is located on the branch oil path after the pressure filter 8 and controls the first clutch oil path pressure and flow. The first clutch pressure sensor 5 is located on the outlet oil path of the first clutch solenoid valve 4 to detect the first clutch oil path pressure. The second clutch solenoid valve 6 is located on the branch oil path after the pressure filter 8 and controls the second clutch oil path pressure and flow. The second clutch pressure sensor 7 is located on the outlet oil path of the second clutch solenoid valve 6 to detect the second clutch oil path pressure. The pressure filter 8 is used for fine filtration of the transmission oil to adsorb smaller impurities in the oil and protect various control valves on the branch oil path. The pressure filter bypass valve 9 is connected in parallel with the pressure filter 8 in the main oil path. When the pressure filter 8 is severely clogged and the pressure difference between the inlet and outlet of the pressure filter 8 reaches the design pressure difference threshold, the pressure filter bypass valve 9 will open and the oil will flow into each branch oil path through the pressure filter bypass valve 9. The shift solenoid valve 10 is located on the branch oil path after the pressure filter 8 and controls the pressure and flow on the shift oil path. In order to improve the efficiency of the automatic transmission hydraulic system, the main oil pressure is set as low as possible under the premise of ensuring the normal operation of each branch oil path. At this time, if the pressure filter 8 is clogged, the pressure loss on the main oil path increases, the inlet pressure of the clutch solenoid valve at the rear end of the pressure filter 8 decreases, and the clutch torque transmission capability is therefore limited, which may cause engine runaway and clutch ablation failures. In order to avoid such problems, when the pressure filter 8 is detected to be clogged, the main oil pressure of the dry circuit can be increased to increase the pressure of the branch oil path at the rear end of the pressure filter 8. When the pressure difference between the front and rear ends of the pressure filter 8 exceeds the design pressure difference threshold, the oil flows into each branch through the pressure filter bypass valve 9 to ensure the pressure and flow control requirements of each branch.

[0050] As shown in Figure 2 and Figure 3 In this embodiment, an automatic transmission pressure filter clogging fault detection and processing method includes the following steps:

[0051] S1: Calculate the pressure filter clogging fault flag Fail filter In this embodiment, whether the pressure filter is clogged is determined according to the clutch pressure following condition, including the following steps:

[0052] S11: Determine if the clutch has a pressure follow-up failure, specifically including the following judgment conditions:

[0053] Condition 1: The main hydraulic solenoid valve is functioning correctly;

[0054] Condition 2: The clutch solenoid valve is not faulty;

[0055] Condition 3: The clutch pressure sensor is fault-free;

[0056] Condition 4: Clutch target pressure P tgt_cl The pressure exceeds the first preset threshold.

[0057] Condition 5: Actual clutch pressure P act_cl The pressure exceeds the second set pressure threshold.

[0058] Based on conditions 4 and 5, the clutch is determined to be a torque transmission clutch with good pressure tracking and no influence from uncertain factors such as oil filling. According to the system characteristics of this embodiment, preferably, the pressure threshold is set to 4 bar.

[0059] Condition 6: Clutch target pressure P act_cl The difference between the actual pressure and the pressure AP is greater than the set differential pressure threshold ΔP. max .

[0060] In this embodiment, based on the design parameters of the pressure filter bypass valve 9, the differential pressure threshold is preferably set to 2 bar.

[0061] If all the above conditions are met, it is determined that a clutch pressure follow-up fault has occurred, and the clutch pressure follow-up fault flag PFail is activated. cl If the value is 1, then the clutch pressure follows the fault flag bit PFail. cl It is 0.

[0062] S12: When clutch pressure follows the fault flag PFail cl When the value is 1, it indicates that the pressure filter is clogged, and the pressure filter clog fault flag is set to Fail. filter If the clutch pressure is 1, the fault flag bit PFail indicates that the clutch pressure is 1. cl If the value is 0, the pressure filter blockage fault flag will be Fail. filter It remains unchanged.

[0063] S2: Calculate the pressure filter blockage failure trigger pressure P b Specifically, it includes the following steps:

[0064] S21: Determine if the pressure filter is clogged (Fail) filter If the value is 1, proceed to step S22; otherwise, set the clutch target pressure P. tgt_clThe recorded pressure P is the pressure filter blockage fault trigger pressure. b That is, P b =P tgt_cl .

[0065] S22: Determine clutch pressure following the fault flag PFail cl Does it change from 0 to 1? If yes, proceed to step S23; otherwise, proceed to step S24.

[0066] S23: Determine the clutch target pressure P tgt_cl Is the pressure P less than the pressure triggered by the filter blockage fault in the previous task cycle? b_z If so, then the clutch target pressure P will be... tgt_cl Recorded as the new pressure filter clog fault trigger pressure P b That is, P b =P tgt_cl If not, proceed to step S24.

[0067] S24: Pressure filter blockage fault triggers pressure P b Keeps unchanged, i.e., P b =P b_z .

[0068] In this embodiment, the transmission system includes two clutches (i.e., the first clutch and the second clutch). Steps S1 and S2 should be performed on each clutch separately, and the respective pressure filter blockage fault trigger pressure should be recorded as P. b1 and P b2 .

[0069] By recording the pressure trigger pressure for a clogged transmission filter, the control system can immediately increase the main hydraulic pressure during subsequent clutch operation if the clutch target pressure exceeds the trigger pressure. This prevents the engine from running away due to clutch pressure failure. As mileage accumulates and transmission fluid contamination worsens, the trigger pressure for a clogged transmission filter can be adaptively updated to enhance clutch protection.

[0070] S3: Based on the pressure filter blockage fault flag Fail filter Clutch target pressure P tgt_cl Pressure filter blockage triggers pressure P b Calculate the main hydraulic pressure boost offset P off_L .

[0071] In this embodiment, regardless of whether a pressure filter blockage fault is detected via the first clutch or the second clutch, the main oil pressure increase offset P off_L The calculations are all the same, and specifically include the following steps:

[0072] S31: Fail indicator for pressure filter blockage filter If the value is 0, then set the main hydraulic pressure increase offset value P. off_L If the value is 0, proceed to step S32.

[0073] S32: Determine the clutch target pressure P tgt_cl Is the pressure P greater than the pressure filter blockage fault trigger pressure? b If so, then use the set boost step size δ Inc The cumulative increase in main oil pressure raises the offset P off_L Until the main oil pressure increases by offset P off_L If the set maximum main oil pressure rise offset threshold is reached, proceed to step S33.

[0074] S33: With the set decompression step size δ Dec Cumulative reduction in main oil pressure increases offset P off_L Until the main oil pressure increases by the offset P off_L It dropped to 0.

[0075] S4: Calculate the base value of main oil pressure P base_L Based on the main oil pressure baseline value P base_L and main oil pressure boost offset P off_L Calculate the main hydraulic pressure command pressure P demand_L Specifically, it includes the following steps:

[0076] S41: Based on the target pressure P of the torque transmission clutch tgt_cli Determine the first baseline value P of the main oil pressure base_L1 That is, P base_L1 =P tgt_cli If two clutches transmit torque simultaneously, the larger of the target pressures of the two torque-transmitting clutches is taken as the first base value P of the main hydraulic pressure. base_L1 In this embodiment, P base_L1 =max(P tgt_cl1 P tgt_cl2 ), where P tgt_cl1 P is the target pressure for torque transmission by the first clutch. tgt_cl2 The target pressure for torque transmission by the second clutch.

[0077] S42: Based on the driver's requested torque and the clutch PT curve, calculate the required pressure P of the torque transmission clutch by referring to the table. Eng_cli If two clutches transmit torque simultaneously, the larger of the required pressures of the two torque-transmitting clutches is taken as the second base value P of the main hydraulic pressure. base_L2 In this embodiment, P base_L2 =max(P Eng_cl1 P Eng_cl2 ); where PEng_cl1 the demand pressure for the first clutch to transmit torque, wherein P Eng_cl2 the demand pressure for the second clutch to transmit torque.

[0078] Here, the clutch PT curve is obtained by initial value self-learning of the offline PT curve, and the PT curve is adaptively updated during the driving process in the service life of the transmission.

[0079] S43: According to the vehicle driving state, such as waiting, crawling, starting, shifting and driving in gear, a third basic value P base_L3 = P idle or P creep or P launch or P handover or P driving is set for the main oil pressure, wherein P idle is the third basic value when the vehicle is in the waiting state; P creep is the third basic value when the vehicle is in the crawling state; P launch is the third basic value when the vehicle is in the starting state; P handover is the third basic value when the vehicle is in the shifting state; P driving is the third basic value when the vehicle is in the driving in gear state.

[0080] In order to avoid the hydraulic system from being unstable due to frequent adjustment of the main oil pressure, a basic main oil pressure is set for each determined driving state of the vehicle, and in the embodiment, the preferred setting is as follows: P idle = 4 bar, P creep = 5 bar, P Launch = 6 bar, P handover = 8 bar, and P driving = 7 bar.

[0081] S44: According to the pawl gear engagement target pressure P tgt_syni , a fourth basic value P base_L4 of the main oil pressure is determined, i.e. P base_L4 = P tgt_syni .

[0082] S45: According to the transmission oil temperature and the main oil pressure basic offset characteristic curve, the main oil pressure basic offset P baseoff_L is calculated.

[0083] In the embodiment, the main oil pressure basic offset characteristic curve is obtained by bench test. In the embodiment, the preferred main oil pressure basic offset characteristic curve is shown in Table 1 (unit: bar).

[0084] -30℃ -10℃ 0℃ 20℃ 40℃ 90℃ 120℃ 8 6 5 3 2.5 2 2

[0085] Table 1

[0086] S46: calculating the master oil pressure basic value P base_L1 , according to the first basic value P base_L2 , the second basic value P base_L3 , the third basic value P base_L4 , and the master oil pressure basic offset P baseoff_L . base_L

[0087] P base_L = max(P base_L1 , P base_L2 , P base_L3 , P base_L4 ) + P baseoff_L .

[0088] S47: calculating the master oil pressure command pressure P base_L , according to the master oil pressure basic value P off_L and the master oil pressure boost offset P demand_L , and the calculation formula is: P demand_L = P base_L + P off_L .

[0089] In the embodiment, an automatic transmission pressure filter blockage fault detection and processing system includes a controller and a memory, the memory stores a computer readable program, and when the computer readable program is called by the controller, the steps of the automatic transmission pressure filter blockage fault detection and processing method as described in the embodiment can be executed.

[0090] The computer readable program is divided into functional modules, which can be divided into: a pressure filter blockage fault detection unit, a pressure filter blockage fault trigger pressure calculation unit, a pressure filter blockage fault processing unit, and a master oil pressure command pressure calculation unit; wherein the pressure filter blockage fault detection unit is used to calculate the pressure filter blockage fault flag bit Fail filter , that is, to determine whether the pressure filter has a blockage fault. The pressure filter blockage fault trigger pressure calculation unit is used to calculate the pressure filter blockage fault trigger pressure P b . The pressure filter blockage fault processing unit is used to calculate the master oil pressure boost offset P off _ ; and the master oil pressure command pressure calculation unit is used to calculate the master oil pressure command pressure P demand _ .

[0091] ​The above embodiments are the preferred embodiments of the present application, but the embodiments of the present application are not limited to the above embodiments, and any changes, modifications, substitutions, combinations, simplifications, etc. made without departing from the spirit and principles of the present application should be equivalent replacement manners and should be included in the protection scope of the present application.

Claims

1. A method for detecting and handling automatic transmission pressure filter clogging faults, characterized in that, Includes the following steps: S1: Calculate the pressure filter blockage fault flag (Fail) filter ; S2: Calculate the pressure filter blockage failure trigger pressure P b Specifically: S21: Determine if the pressure filter is clogged (Fail) filter If the value is 1, proceed to step S22; otherwise, set the clutch target pressure P. tgt_cl The recorded pressure P is the pressure filter blockage fault trigger pressure. b That is, P b =P tgt_cl ; S22: Determine clutch pressure following the fault flag PFail cl Does it change from 0 to 1? If yes, proceed to step S23; otherwise, proceed to step S24. S23: Determine the clutch target pressure P tgt_cl Is the pressure P less than the pressure triggered by the filter blockage fault in the previous task cycle? b_z If so, then the clutch target pressure P will be... tgt_cl Recorded as the new pressure filter clog fault trigger pressure P b That is, P b =P tgt_cl If not, proceed to step S24; S24: Pressure filter blockage fault triggers pressure P b Keeps unchanged, i.e., P b =P b_z ; S3: Based on the pressure filter blockage fault flag Fail filter Clutch target pressure P tgt_cl Pressure filter blockage triggers pressure P b Calculate the main hydraulic pressure boost offset P off_L Specifically: S31: Fail indicator for pressure filter blockage filter If the value is 0, then set the main hydraulic pressure increase offset value P. off_L If the value is 0, proceed to step S32; S32: Determine the clutch target pressure P tgt_cl Is the pressure P greater than the pressure filter blockage fault trigger pressure? b If so, then use the set boost step size δ Inc The cumulative increase in main oil pressure raises the offset P off_L Until the main oil pressure increases by the offset P off_L If the set maximum main oil pressure rise offset threshold is reached, proceed to step S33; S33: With the set decompression step size δ Dec Cumulative reduction in main oil pressure increases offset P off_L Until the main oil pressure increases by the offset P off_L Reduced to 0; S4: Calculate the base value of main oil pressure P base_L Based on the main oil pressure baseline value P base_L and main oil pressure boost offset P off_L Calculate the main hydraulic pressure command pressure P demand_L Specifically: S41: Based on the target pressure P of the torque transmission clutch tgt_cli Determine the first baseline value P of the main oil pressure base_L1 ; S42: Calculate the required pressure P of the torque transmission clutch based on the driver's requested torque and the clutch PT curve, by referring to a table. Enh_cli And as the second base value P of the main oil pressure. base_L2 ; S43: Set the third base value P of the main hydraulic pressure according to the overall vehicle driving status. base_L3 ; S44: Based on the target pressure P for shifting the shift fork tgt_syni Determine the fourth basic value P of the main oil pressure. base_L4 ; S45: Calculate the main hydraulic pressure base offset P by referring to the table based on the transmission oil temperature and the main hydraulic pressure base offset characteristic curve. baseoff_L ; S46: Based on the first baseline value P of the main oil pressure base_L1 Second basic value P base_L2 The third basic value P base_L3 The fourth fundamental value P base_L4 and main hydraulic base offset P baseoff_L Calculate the base value of main oil pressure P base_L .

2. The method for detecting and handling automatic transmission pressure filter blockage faults according to claim 1, characterized in that: Step S1 specifically involves: S11: Determine if the clutch has a pressure follow-up failure, specifically including the following judgment conditions: Condition 1: The main hydraulic solenoid valve is functioning correctly; Condition 2: The clutch solenoid valve is fault-free; Condition 3: The clutch pressure sensor is fault-free; Condition 4: Clutch target pressure P tgt_cl The pressure exceeds the first preset threshold. Condition 5: Actual clutch pressure P act_cl The pressure exceeds the second set pressure threshold. Condition 6: Clutch target pressure P act_cl The difference between the actual pressure and the set differential pressure threshold ΔP is greater than the set differential pressure threshold ΔP. max ; If all the above conditions are met, it is determined that a clutch pressure follow-up fault has occurred, and the clutch pressure follow-up fault flag PFail is activated. cl If the value is 1, then the clutch pressure follows the fault flag bit PFail. cl =0; S12: When clutch pressure follows the fault flag PFail cl When the value is 1, it indicates that the pressure filter is clogged, and the pressure filter clog fault flag is set to Fail. filter If the clutch pressure is 1, the fault flag bit PFail indicates that the clutch pressure is 1. cl If the value is 0, the pressure filter blockage fault flag will be Fail. filter It remains unchanged.

3. The method for detecting and handling automatic transmission pressure filter blockage faults according to claim 2, characterized in that: In step S41, if two clutches transmit torque simultaneously, the larger of the target pressures of the two torque-transmitting clutches is taken as the first base value P of the main oil pressure. base_L1 .

4. The method for detecting and handling automatic transmission pressure filter blockage according to claim 2, characterized in that: In step S42, if two clutches transmit torque simultaneously, the larger of the required pressures of the two torque-transmitting clutches is taken as the second base value P of the main oil pressure. base_L2 .

5. The method for detecting and handling automatic transmission pressure filter blockage faults according to claim 2, characterized in that: In step S46, the main oil pressure base value P base_L The calculation formula is as follows: P base_L =max(P base_L1 ,P base_L2 ,P base_L3 ,P base_L4 )+P baseoff_L 。 6. The method for detecting and handling automatic transmission pressure filter blockage according to claim 1, characterized in that: In step S4, based on the main oil pressure baseline value P base_L and main oil pressure boost offset P off_L Calculate the main hydraulic pressure command pressure P demand_L Specifically: P demand_L =P base_L +P off_L .

7. A system for detecting and handling clogging faults in an automatic transmission pressure filter, characterized in that: It includes a controller and a memory, wherein the memory stores a computer-readable program, which, when invoked by the controller, can perform the steps of the automatic transmission pressure filter clogging fault detection and handling method as described in any one of claims 1 to 6.

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