Automatic transmission clutch clamping stagnation fault diagnosis system and working method thereof

Abstract

The invention discloses an automatic transmission clutch clamping stagnation fault diagnosis system and a working method thereof, and belongs to the technical field of transmissions. The signal input module recognizes gear shifting input signals, then gathers the gear shifting input signals and calculates a gear shifting rotating speed difference value; the gear shifting process judging module judges whether gear shifting enters a rotating speed stage or not; judging whether the duration of the gear shifting rotating speed difference smaller than or equal to the diagnosis rotating speed difference is larger than or equal to the fault diagnosis time or not, if yes, confirming that the clutch is in a clamping stagnation state, and outputting a clutch clamping stagnation signal; otherwise, determining that the clutch state is normal, and outputting a clutch normal signal; and the fault processing module performs rechecking and subsequent processing operation after receiving the clamping stagnation signal of the clutch. Whether the clutch has the clamping stagnation fault or not can be diagnosed in the gear shifting process, effective follow-up processing operation can be carried out, the reliability and durability of the automatic transmission are improved, the driving safety is improved, and accidents caused by the clutch fault are reduced.

Description

Technical Field

[0001] The invention relates to an automatic transmission clutch jam fault diagnosis system and a working method thereof, belonging to the technical field of transmissions. Background Art

[0002] One of the core functions of an automatic transmission is to enable the vehicle to automatically switch to the best transmission ratio, i.e., different gears, at different speeds to adapt to different driving conditions and needs by precisely controlling the clutches and brakes in the hydraulic system. This process relies on a complex hydraulic system, especially the precise control of the solenoid valves, to adjust the clutch and brake engagement pressure. Typically, the establishment of each gear involves the coordinated work of two or more clutches, some of which are engaged to transmit power, while others may remain disengaged to interrupt the power transmission path. During the gear shifting process, in order to smoothly transition to a new gear, one or more clutches need to be gradually disengaged, while another or other clutches need to be quickly and accurately engaged. This precise coordinated control is the key to ensuring smooth gear shifting and transmission efficiency.

[0003] However, in actual applications, the clutch may become stuck due to a variety of reasons (such as friction material wear, oil accumulation, mechanical component failure, etc.), that is, it cannot be separated or engaged as expected. Clutch sticking failure is particularly dangerous during the gear shifting process because it prevents the normal formation of the new gear, resulting in power transmission interruption or abnormality, which may cause excessive wear and damage to the mechanical components inside the gearbox, and even pose a serious threat to vehicle driving safety.

[0004] Currently, the automatic transmission diagnostic technology on the market mainly focuses on abnormality detection after the gear shift is completed, and identifies potential problems by monitoring the deviation of vehicle performance parameters (such as vehicle speed, engine speed, etc.) after the gear shift from the expected value. However, this method has significant limitations because it cannot diagnose clutch sticking faults in real time during the gear shift process, and thus cannot take timely measures to avoid more serious consequences. Summary of the invention

[0005] In order to solve the problems existing in the background technology, the present invention provides an automatic transmission clutch sticking fault diagnosis system and a working method thereof.

[0006] To achieve the above object, the present invention adopts the following technical scheme: an automatic transmission clutch jam fault diagnosis system, comprising

[0007] A signal input module is used to aggregate and pre-process the shift input signals to calculate the required shift speed difference;

[0008] A gear shifting process determination module, used for calculating the gear shifting process according to the gear shifting input signal;

[0009] A fault diagnosis module is used to diagnose whether the clutch has a stuck fault;

[0010] The fault handling module is used to review and perform subsequent processing operations after a fault occurs.

[0011] A working method of an automatic transmission clutch jam fault diagnosis system of the present invention comprises the following steps:

[0012] S1: After the signal input module identifies the gear shift input signal, it summarizes the gear shift input signal and calculates the gear shift speed difference Ndif;

[0013] The calculation formula of the shift speed difference Ndif is as follows:

[0014] Ndif=N-Na

[0015] Na=No×ga

[0016] Where:

[0017] Ndif is the gear shift speed difference;

[0018] N is the actual input shaft speed in the actual gear;

[0019] Na is the target input shaft speed of the actual gear;

[0020] No is the target output shaft speed of the actual gear;

[0021] ga is the actual gear ratio.

[0022] S2: The gear shift process determination module determines whether the gear shift enters the speed stage. If the gear shift enters the speed stage, S3 is performed. Otherwise, S3 is performed after the gear shift enters the speed stage.

[0023] The gear shifting determination method is as follows:

[0024] If the gear shift speed difference Ndif is greater than or equal to the target speed difference Ngap, it is determined to enter the speed stage;

[0025] If the gear shift speed difference Ndif is less than the target speed difference Ngap, and the gear shifting time t does not exceed the forced gear shifting time T0, wait until the gear shift speed difference Ndif is equal to the target speed difference Ngap before entering the speed stage;

[0026] If the gear shift speed difference Ndif is less than or equal to the target speed difference Ngap, and the gear shifting time t exceeds the forced gear shifting time T0, the gear shifting is forced to enter the speed stage.

[0027] S3: Determine whether the duration of the shift speed difference Ndif being less than or equal to the diagnosis speed difference Nd is greater than or equal to the fault diagnosis time T1. If yes, it is determined that the clutch is in a stuck state and a clutch stuck signal is output; otherwise, it is determined that the clutch is in a normal state and a clutch normal signal is output;

[0028] S4: After receiving the clutch sticking signal, the fault handling module returns the gear shift. After the gear shift is returned, the gear shift is triggered again. If the gear shift can be completed normally, the clutch sticking signal is cleared. If the gear shift cannot be completed normally and the clutch sticking signal is output again, the gear shift is returned again. When the number of sticking times reaches the set target value, the clutch sticking fault is reported, and the gear shift is prohibited or the target gear is prohibited from issuing a gear position that does not require a stuck clutch. If multiple clutches are stuck, the fixed gear will no longer shift.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention can diagnose whether a clutch has a stuck fault during the gear shifting process, and can perform effective subsequent processing operations, thereby improving the reliability and durability of the automatic transmission, enhancing driving safety, and reducing the occurrence of accidents caused by clutch failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a flow chart of the working method of the present invention;

[0032] Figure 2 It is a schematic diagram of the clutch working process. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] An automatic transmission clutch jam fault diagnosis system, comprising:

[0035] A signal input module is used to aggregate and pre-process the shift input signals to calculate the required shift speed difference;

[0036] A gear shifting process determination module, used for calculating the gear shifting process according to the gear shifting input signal;

[0037] A fault diagnosis module is used to diagnose whether the clutch has a stuck fault;

[0038] The fault handling module is used to review and perform subsequent processing operations after a fault occurs.

[0039] A working method of an automatic transmission clutch jam fault diagnosis system of the present invention comprises the following steps:

[0040] S1: After the signal input module identifies the gear shift input signal, it summarizes the gear shift input signal and calculates the gear shift speed difference Ndif;

[0041] The calculation formula of the shift speed difference Ndif is as follows:

[0042] Ndif=N-Na

[0043] Na=No×ga

[0044] Where:

[0045] Ndif is the gear shift speed difference;

[0046] N is the actual input shaft speed in the actual gear;

[0047] Na is the target input shaft speed of the actual gear;

[0048] No is the target output shaft speed of the actual gear;

[0049] ga is the actual gear ratio.

[0050] S2: The gear shift process determination module determines whether the gear shift (the process of the input shaft speed changing from the actual input shaft speed N of the actual gear to the target input shaft speed Nt of the target gear) has entered the speed stage. If the gear shift enters the speed stage, S3 is performed. Otherwise, S3 is performed after the gear shift enters the speed stage.

[0051] The gear shifting determination method is as follows:

[0052] If the gear shift speed difference Ndif is greater than or equal to the target speed difference Ngap, it is determined to enter the speed stage;

[0053] If the gear shift speed difference Ndif is less than the target speed difference Ngap, and the gear shifting time t does not exceed the forced gear shifting time T0, wait until the gear shift speed difference Ndif is equal to the target speed difference Ngap before entering the speed stage;

[0054] If the gear shift speed difference Ndif is less than or equal to the target speed difference Ngap, and the gear shifting time t exceeds the forced gear shifting time T0, the gear shifting is forced to enter the speed stage.

[0055] S3: Determine whether the duration of the shift speed difference Ndif being less than or equal to the diagnosis speed difference Nd (preferably 30 rpm) is greater than or equal to the fault diagnosis time T1. If yes, it is determined that the clutch is in a stuck state and a clutch stuck signal is output; otherwise, it is determined that the clutch is in a normal state and a clutch normal signal is output;

[0056] S4: After receiving the clutch stuck signal, the fault processing module returns the gear shift, that is, the gear position returns to the gear position before the gear shift operation. After the gear shift is returned, the gear shift is triggered again. If the gear shift can be completed normally, the clutch stuck signal is cleared; if the gear shift cannot be completed normally and the clutch stuck signal is output again, the gear shift is returned again. When the number of stuck times reaches the set target value (preset to 3 times), the clutch stuck fault is reported, and the gear shift is prohibited or the target gear position is prohibited from issuing a gear position for non-stuck clutch operation. If multiple clutches are stuck, the fixed gear position will not shift.

[0057] The shift control process is to control the clutch on the engagement side to engage, and control the clutch on the disengagement side to disengage.

[0058] The gear position is formed by simultaneously engaging at least two clutches.

[0059] The sticking fault is a clutch failure that cannot be separated.

[0060] The sticking fault diagnosis includes upshifting and downshifting.

[0061] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0062] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An automatic transmission clutch jam fault diagnosis system, characterized in that: include A signal input module is used to aggregate and pre-process the shift input signals to calculate the required shift speed difference; A gear shifting process determination module, used for calculating the gear shifting process according to the gear shifting input signal; A fault diagnosis module is used to diagnose whether there is a clutch jam fault; The fault handling module is used to review and perform subsequent processing operations after a fault occurs.

2. A working method of the automatic transmission clutch sticking fault diagnosis system according to claim 1, characterized in that: The method comprises the following steps: S1: After the signal input module identifies the gear shift input signal, it summarizes the gear shift input signal and calculates the gear shift speed difference Ndif; S2: The gear shift process determination module determines whether the gear shift enters the speed stage. If the gear shift enters the speed stage, S3 is performed. Otherwise, S3 is performed after the gear shift enters the speed stage. S3: Determine whether the duration of the shift speed difference Ndif being less than or equal to the diagnosis speed difference Nd is greater than or equal to the fault diagnosis time T1. If yes, it is determined that the clutch is in a stuck state and a clutch stuck signal is output; otherwise, it is determined that the clutch is in a normal state and a clutch normal signal is output; S4: After receiving the clutch stuck signal, the fault processing module returns the shift and triggers the shift again after the shift is returned. If the shift can be completed normally, the clutch stuck signal is cleared. If the gear shift cannot be completed normally and the clutch sticking signal is output again, the gear shift will be returned and processed again. When the number of sticking times reaches the set target value, the clutch sticking fault will be reported, and the gear shift will be prohibited or the target gear will be prohibited from issuing a non-stuck clutch working gear. If multiple clutches are stuck, the fixed gear will no longer shift.

3. The method according to claim 2, characterized in that: The calculation formula of the shift speed difference Ndif in S1 is as follows: Ndif=N-Na Na=No×ga Where: Ndif is the gear shift speed difference; N is the actual input shaft speed in the actual gear; Na is the target input shaft speed of the actual gear; No is the target output shaft speed of the actual gear; ga is the actual gear ratio.

4. The method according to claim 2, characterized in that: The determination method of the gear shift described in S2 is as follows: If the gear shift speed difference Ndif is greater than or equal to the target speed difference Ngap, it is determined to enter the speed stage; If the gear shift speed difference Ndif is less than the target speed difference Ngap, and the gear shifting time t does not exceed the forced gear shifting time T0, wait until the gear shift speed difference Ndif is equal to the target speed difference Ngap before entering the speed stage; If the gear shift speed difference Ndif is less than or equal to the target speed difference Ngap, and the gear shifting time t exceeds the forced gear shifting time T0, the gear shifting is forced to enter the speed stage.

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