CN114251447A - A method and device for diagnosing sliding wear faults of wet dual-clutch transmission - Google Patents
A method and device for diagnosing sliding wear faults of wet dual-clutch transmission Download PDFInfo
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- CN114251447A CN114251447A CN202011028965.3A CN202011028965A CN114251447A CN 114251447 A CN114251447 A CN 114251447A CN 202011028965 A CN202011028965 A CN 202011028965A CN 114251447 A CN114251447 A CN 114251447A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe ; Circumventing or fixing failures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/022—Power-transmitting couplings or clutches
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe ; Circumventing or fixing failures
- F16H2061/1208—Detecting malfunction or potential malfunction, e.g. fail safe ; Circumventing or fixing failures with diagnostic check cycles; Monitoring of failures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe ; Circumventing or fixing failures
- F16H2061/1256—Detecting malfunction or potential malfunction, e.g. fail safe ; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected
- F16H2061/1276—Detecting malfunction or potential malfunction, e.g. fail safe ; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected the failing part is a friction device, e.g. clutches or brakes
- F16H2061/128—Detecting malfunction or potential malfunction, e.g. fail safe ; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected the failing part is a friction device, e.g. clutches or brakes the main clutch
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- Control Of Transmission Device (AREA)
Abstract
The embodiment of the invention provides a method and a device for diagnosing a slip fault of a wet dual-clutch transmission, wherein the method comprises the following steps: judging the current running state of the vehicle according to the real-time acquired vehicle working condition information; when the current running state of the vehicle is judged to be the driving mode state, fault diagnosis is carried out on the clutch according to a preset first diagnosis strategy; when the current running state of the vehicle is judged to be a gear shifting mode state and the current gear shifting type is power upshift or coasting downshift, performing fault diagnosis on the clutch according to a preset second diagnosis strategy; and when the current running state of the vehicle is judged to be the gear shifting mode state and the current gear shifting type is power downshift or sliding upshift, performing fault diagnosis on the clutch according to a preset third diagnosis strategy. According to the invention, different diagnosis methods are adopted according to different operation stages of the whole vehicle, and the fault diagnosis can be accurately and timely carried out on the clutch, so that the further damage of the transmission after the function failure of the clutch is avoided and the possible running risk is avoided.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a method and a device for diagnosing a slip wear fault of a wet type dual-clutch transmission.
Background
The wet-type double-clutch transmission has the characteristics of simple structure, high transmission efficiency and the like, and has good application prospect. The clutch is a key component of the automatic transmission and plays a role in transmitting or cutting off the power of the engine, and the state of the clutch directly influences the running state and the performance of the transmission.
The realization of the clutch function in the wet double clutch transmission relates to the combined action of a plurality of systems such as mechanical, hydraulic and electric control systems, and the like, wherein the failure of any one part can cause the failure of the function of the clutch part, thereby influencing the normal work of the transmission. The performance reduction caused by the faults of the electric control system and the hydraulic system or long-term use cannot be diagnosed completely through the pressure diagnosis or the electric control system of the clutch, and the mechanical faults such as the change or the excessive wear of the characteristics of a clutch plate caused by long-term wear of the clutch in the use process of the clutch or the ablation or the adhesion of a friction plate of the clutch caused by severe environments such as high temperature cannot be shown on the pressure of the clutch, so that the missed diagnosis of the faults of the clutch is easy to occur by diagnosing through the existing diagnosis method aiming at the mechanical failure mode of the clutch, and therefore, a corresponding protection mechanism can be triggered, and the performance of the transmission and the driving experience of a vehicle are influenced.
Disclosure of Invention
The embodiment of the invention aims to provide a method and a device for diagnosing the slip wear fault of a wet type dual-clutch transmission, so as to solve the technical problems, accurately and timely diagnose the clutch fault, and avoid the further damage of the transmission after the function failure of the clutch and the possible driving risk.
In order to solve the technical problem, an embodiment of the present invention provides a method for diagnosing a slip fault of a wet dual clutch transmission, including:
judging the current running state of the vehicle according to the real-time acquired vehicle working condition information;
when the current running state of the vehicle is judged to be the driving mode state, fault diagnosis is carried out on the clutch according to a preset first diagnosis strategy;
when the current running state of the vehicle is judged to be a gear shifting mode state and the current gear shifting type is power upshift or coasting downshift, performing fault diagnosis on the clutch according to a preset second diagnosis strategy;
and when the current running state of the vehicle is judged to be the gear shifting mode state and the current gear shifting type is power downshift or sliding upshift, performing fault diagnosis on the clutch according to a preset third diagnosis strategy.
Further, before performing fault diagnosis on the clutch according to a preset first diagnosis strategy when the current running state of the vehicle is judged to be the driving mode state, the method further includes:
and when the state of the engine rotating speed sensor is abnormal or the state of the clutch rotating speed sensor is abnormal, the fault diagnosis of the clutch is quitted.
Further, the method for diagnosing the slip fault of the wet dual-clutch transmission further comprises the following steps:
and when the current running state of the vehicle is judged to be the gear shifting mode state and the current gear shifting type is power interruption gear shifting, quitting the fault diagnosis of the clutch.
Further, the diagnosing the fault of the clutch according to the preset first diagnosis strategy specifically includes:
calculating a difference value between the rotating speed of the engine and the target rotating speed of the clutch, and integrating the difference value with time to obtain a first monitoring target quantity;
and if the first monitoring target quantity is larger than a preset integral threshold value, diagnosing that the clutch has the fault of excessively high sliding friction rotating speed.
Further, the calculating a difference between the engine speed and the clutch target speed, and integrating the difference with time to obtain a first monitoring target quantity specifically includes:
calculating the difference value between the engine rotating speed and the clutch target rotating speed, and judging whether the difference value is smaller than the maximum sliding friction rotating speed in the driving mode;
if so, integrating the difference value with time to obtain the first monitoring target quantity;
and if not, integrating the maximum sliding grinding rotating speed and time to obtain the first monitoring target quantity.
Further, the diagnosing the fault of the clutch according to a preset second diagnosis strategy specifically includes:
calculating the difference value between the rotating speed of the engine and the actual rotating speed of the target clutch, and subtracting the first initial difference value from the difference value to obtain a second monitoring target quantity; the first initial difference value is the difference value between the engine speed at the moment when the gear shifting stage is just started and the actual speed of the target clutch;
and if the second monitoring target quantity is larger than a preset first speed difference threshold value and the gear shifting time exceeds a preset gear shifting time threshold value, diagnosing that the target clutch has the fault of high slip rotating speed.
Further, the diagnosing the fault of the clutch according to a preset third diagnosis strategy specifically includes:
calculating the difference value between the rotating speed of the engine and the actual rotating speed of the non-target clutch, and subtracting the second initial difference value from the difference value to obtain a third monitoring target quantity; the second initial difference value is the difference value between the engine speed at the beginning of entering the gear shifting stage and the actual speed of the non-target clutch;
and if the third monitoring target quantity is smaller than a preset second speed difference threshold value and the gear shifting time exceeds a preset gear shifting time threshold value, diagnosing that the non-target clutch has a low slip-friction speed fault.
In order to solve the same technical problem, the invention also provides a slip fault diagnosis device for a wet dual-clutch transmission, which comprises a controller, wherein the controller is used for:
judging the current running state of the vehicle according to the real-time acquired vehicle working condition information;
when the current running state of the vehicle is judged to be the driving mode state, fault diagnosis is carried out on the clutch according to a preset first diagnosis strategy;
when the current running state of the vehicle is judged to be a gear shifting mode state and the current gear shifting type is power upshift or coasting downshift, performing fault diagnosis on the clutch according to a preset second diagnosis strategy;
and when the current running state of the vehicle is judged to be the gear shifting mode state and the current gear shifting type is power downshift or sliding upshift, performing fault diagnosis on the clutch according to a preset third diagnosis strategy.
Further, the controller is further configured to:
and when the state of the engine rotating speed sensor is abnormal or the state of the clutch rotating speed sensor is abnormal, the fault diagnosis of the clutch is quitted.
Further, the controller is further configured to:
and when the current running state of the vehicle is judged to be the gear shifting mode state and the current gear shifting type is power interruption gear shifting, quitting the fault diagnosis of the clutch.
Compared with the prior art, the invention has the following beneficial effects:
the embodiment of the invention provides a method and a device for diagnosing a slip fault of a wet dual-clutch transmission, wherein the method comprises the following steps: judging the current running state of the vehicle according to the real-time acquired vehicle working condition information; when the current running state of the vehicle is judged to be the driving mode state, fault diagnosis is carried out on the clutch according to a preset first diagnosis strategy; when the current running state of the vehicle is judged to be a gear shifting mode state and the current gear shifting type is power upshift or coasting downshift, performing fault diagnosis on the clutch according to a preset second diagnosis strategy; and when the current running state of the vehicle is judged to be the gear shifting mode state and the current gear shifting type is power downshift or sliding upshift, performing fault diagnosis on the clutch according to a preset third diagnosis strategy. According to the invention, different diagnosis methods are adopted according to different operation stages of the whole vehicle, and the fault diagnosis can be accurately and timely carried out on the clutch, so that the further damage of the transmission after the function failure of the clutch is avoided and the possible running risk is avoided.
Drawings
FIG. 1 is a schematic flow chart of a method for diagnosing a slip fault of a wet dual clutch transmission according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a clutch slip fault diagnosis provided by an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating clutch slip diagnostics in a drive mode according to one embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating clutch slip diagnostics during a shift mode according to an embodiment of the present invention;
FIG. 5 is another flow chart illustrating clutch slip diagnostics during a shift mode according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 5, an embodiment of the present invention provides a method for diagnosing a slip fault of a wet dual clutch transmission, including:
and S1, judging the current running state of the vehicle according to the real-time acquired automobile working condition information.
In the embodiment of the invention, step S1 is to distinguish the running state of the whole vehicle, whether the vehicle is in a driving condition or a gear shifting condition. The running state of the whole vehicle is mainly distinguished according to the driving state of the whole vehicle and the gear shifting type. The driving state (driving mode state) mainly refers to accelerator stepping starting, powered stable gear operation and unpowered stable gear operation, and at the moment, the transmission has no gear shifting action and a single clutch is in a sliding and grinding working condition; the double-clutch automatic transmission has the advantages that the non-power-interruption gear shifting can be realized, the gear shifting monitored by the embodiment of the invention is the non-power-interruption gear shifting process, and the gear shifting is divided into four types, namely power upshifting, power downshifting, sliding upshifting and sliding downshifting according to the power and gear ascending and descending according to the characteristics of the clutch. Each gear shifting process is divided into an oil charge phase, a torque phase and a rotating speed phase, and the sequence of the gear shifting stages of different gear shifting types is different. The clutch slip monitoring is mainly to monitor the speed phase of the gear shift, and the step S1 is executed specifically to determine the current stage of the vehicle according to the vehicle state, the gear shift type and the gear shift stage, and there are different diagnostic methods according to the characteristics of the different stages.
In the embodiment of the present invention, further, before step S2, the method further includes the steps of:
and when the state of the engine rotating speed sensor is abnormal or the state of the clutch rotating speed sensor is abnormal, the fault diagnosis of the clutch is quitted.
It should be noted that, because the clutch slip is mainly the slip between the driving part and the driven part of the clutch, the failure of monitoring the slip rotation speed mainly monitors whether the speed difference between the driving part and the driven part of the clutch is out of limit, the rotation speed of the driving disk of the clutch refers to the rotation speed of the engine, the rotation speed of the driven disk refers to the rotation speed of the clutch, and the states of the engine rotation speed sensor and the two clutch rotation speed sensors are normal to ensure the credible sensor values, so that the failure diagnosis can be performed.
In an embodiment of the present invention, further, the method for diagnosing a slip fault of a wet dual clutch transmission further includes the steps of:
and when the current running state of the vehicle is judged to be the gear shifting mode state and the current gear shifting type is power interruption gear shifting, quitting the fault diagnosis of the clutch.
It should be noted that since one of the advantages of a dual clutch transmission is that power-off shifts can be achieved without power interruption, and power-off shifts can only be used under certain special operating conditions, clutch slippage monitoring diagnostics will preclude power-off shifts.
And S2, when the current running state of the vehicle is judged to be the driving mode state, carrying out fault diagnosis on the clutch according to a preset first diagnosis strategy.
In this embodiment of the present invention, further, the diagnosing a fault of the clutch according to a preset first diagnostic strategy specifically includes:
calculating a difference value between the rotating speed of the engine and the target rotating speed of the clutch, and integrating the difference value with time to obtain a first monitoring target quantity;
and if the first monitoring target quantity is larger than a preset integral threshold value, diagnosing that the clutch has the fault of excessively high sliding friction rotating speed.
In this embodiment of the present invention, further, the calculating a difference between the engine speed and the clutch target speed, and integrating the difference with time to obtain a first monitoring target quantity specifically includes:
calculating the difference value between the engine rotating speed and the clutch target rotating speed, and judging whether the difference value is smaller than the maximum sliding friction rotating speed in the driving mode;
if so, integrating the difference value with time to obtain the first monitoring target quantity;
and if not, integrating the maximum sliding grinding rotating speed and time to obtain the first monitoring target quantity.
It should be noted that, steps S2-S4 are to calculate the monitoring target quantities under different states according to the vehicle running state and perform fault diagnosis, where step S2 is to perform fault diagnosis under the driving mode state; firstly, comparing the difference value of the engine rotating speed and the target clutch rotating speed with the maximum slipping rotating speed in a driving mode, taking the minimum value as A (preventing the slipping fault of the clutch from being misinformed when the integral result quickly reaches the preset upper limit value due to overlarge rotating speed difference between the engine and the clutch in the starting process), then integrating A with time and multiplying the integral factor by the integral factor, wherein the integral factor is related to whether the whole vehicle is started by stepping on an accelerator or runs in a stable gear, and in the integrating process, if the A value in a certain period is smaller than the preset value, the integral value is attenuated by a certain step length, so that the situation that the false alarm is generated because the integral result is always accumulated is prevented. When the calculated integral value (first monitoring target value) is larger than a preset integral upper limit (integral threshold value), a fault that the clutch is in a slipping rotating speed state is diagnosed, and the clutch cannot be combined.
And S3, when the current running state of the vehicle is judged to be the gear shifting mode state and the current gear shifting type is power upshift or coasting downshift, performing fault diagnosis on the clutch according to a preset second diagnosis strategy.
In this embodiment of the present invention, further, the diagnosing a fault of the clutch according to a preset second diagnosis strategy specifically includes:
calculating the difference value between the rotating speed of the engine and the actual rotating speed of the target clutch, and subtracting the first initial difference value from the difference value to obtain a second monitoring target quantity; the first initial difference value is the difference value between the engine speed at the moment when the gear shifting stage is just started and the actual speed of the target clutch;
and if the second monitoring target quantity is larger than a preset first speed difference threshold value and the gear shifting time exceeds a preset gear shifting time threshold value, diagnosing that the target clutch has the fault of high slip rotating speed.
It should be noted that, step S3 is a fault diagnosis of the entire vehicle in the power upshift or coasting downshift shift stage, specifically, the difference between the engine speed and the actual speed of the target clutch is calculated first, and the initial difference between the engine speed that just starts to enter the shift stage and the actual speed of the target clutch is subtracted from the difference to obtain a second monitored target amount; and when the second monitoring target quantity is judged to be larger than the preset threshold value and the gear shifting time exceeds the preset time, the fault that the target clutch is worn at an excessively high rotating speed is diagnosed, and the target clutch cannot be combined.
And S4, when the current running state of the vehicle is judged to be the gear shifting mode state and the current gear shifting type is power downshift or coasting upshift, performing fault diagnosis on the clutch according to a preset third diagnosis strategy.
In this embodiment of the present invention, further, the diagnosing a fault of the clutch according to a preset third diagnostic strategy specifically includes:
calculating the difference value between the rotating speed of the engine and the actual rotating speed of the non-target clutch, and subtracting the second initial difference value from the difference value to obtain a third monitoring target quantity; the second initial difference value is the difference value between the engine speed at the beginning of entering the gear shifting stage and the actual speed of the non-target clutch;
and if the third monitoring target quantity is smaller than a preset second speed difference threshold value and the gear shifting time exceeds a preset gear shifting time threshold value, diagnosing that the non-target clutch has a low slip-friction speed fault.
It should be noted that, step S4 is a fault diagnosis of the whole vehicle in the power downshift or coasting upshift stage, specifically, a difference between the engine speed and the actual speed of the non-target clutch is calculated, and the initial difference between the engine speed at the beginning of entering the shift stage and the actual speed of the non-target clutch is subtracted from the difference to obtain a third monitoring target amount; and when the third monitoring target quantity is smaller than the preset threshold value and the gear shifting time exceeds the preset gear shifting time, triggering a fault that the slip-grinding rotating speed of the non-target clutch is too low, and enabling the non-target clutch not to be separated.
Compared with the prior art, the embodiment of the invention monitors the clutch sliding wear condition in the running process of the whole vehicle, finds the fault condition of the clutch in time, provides key input for corresponding fault processing, enables control software to take safety protection measures in time and prevents the vehicle running risk caused by the failure of the clutch; the problem that in the prior art, multiple gear shifting is performed and the clutch fault can be confirmed only by subsequent operation of a driver is solved; meanwhile, the embodiment of the invention solves the problems of false alarm and false alarm of the clutch fault at present, and prevents the limitation of the function of the transmission caused by false diagnosis in the running process of the vehicle from influencing the driving performance of the vehicle.
It should be noted that the above method or flow embodiment is described as a series of acts or combinations for simplicity, but those skilled in the art should understand that the present invention is not limited by the described acts or sequences, as some steps may be performed in other sequences or simultaneously according to the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are exemplary embodiments and that no single embodiment is necessarily required by the inventive embodiments.
In order to solve the same technical problem, the invention also provides a slip fault diagnosis device for a wet dual-clutch transmission, which comprises a controller, wherein the controller is used for:
judging the current running state of the vehicle according to the real-time acquired vehicle working condition information;
when the current running state of the vehicle is judged to be the driving mode state, fault diagnosis is carried out on the clutch according to a preset first diagnosis strategy;
when the current running state of the vehicle is judged to be a gear shifting mode state and the current gear shifting type is power upshift or coasting downshift, performing fault diagnosis on the clutch according to a preset second diagnosis strategy;
and when the current running state of the vehicle is judged to be the gear shifting mode state and the current gear shifting type is power downshift or sliding upshift, performing fault diagnosis on the clutch according to a preset third diagnosis strategy.
Further, the controller is further configured to:
and when the state of the engine rotating speed sensor is abnormal or the state of the clutch rotating speed sensor is abnormal, the fault diagnosis of the clutch is quitted.
Further, the controller is further configured to:
and when the current running state of the vehicle is judged to be the gear shifting mode state and the current gear shifting type is power interruption gear shifting, quitting the fault diagnosis of the clutch.
It can be understood that the above device embodiment corresponds to the method embodiment of the present invention, and the slip fault diagnosis device for a wet dual-clutch transmission according to the embodiment of the present invention can implement the slip fault diagnosis method for a wet dual-clutch transmission according to any one of the method embodiments of the present invention.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A method for diagnosing a slip fault of a wet dual-clutch transmission is characterized by comprising the following steps:
judging the current running state of the vehicle according to the real-time acquired vehicle working condition information;
when the current running state of the vehicle is judged to be the driving mode state, fault diagnosis is carried out on the clutch according to a preset first diagnosis strategy;
when the current running state of the vehicle is judged to be a gear shifting mode state and the current gear shifting type is power upshift or coasting downshift, performing fault diagnosis on the clutch according to a preset second diagnosis strategy;
and when the current running state of the vehicle is judged to be the gear shifting mode state and the current gear shifting type is power downshift or sliding upshift, performing fault diagnosis on the clutch according to a preset third diagnosis strategy.
2. The slip fault diagnosis method for a wet dual clutch transmission according to claim 1, wherein before the fault diagnosis of the clutch according to a preset first diagnosis strategy when the current running state of the vehicle is determined as the driving mode state, the method further comprises:
and when the state of the engine rotating speed sensor is abnormal or the state of the clutch rotating speed sensor is abnormal, the fault diagnosis of the clutch is quitted.
3. The method of claim 1, further comprising:
and when the current running state of the vehicle is judged to be the gear shifting mode state and the current gear shifting type is power interruption gear shifting, quitting the fault diagnosis of the clutch.
4. The method for diagnosing the slip fault of the wet dual-clutch transmission according to claim 1, wherein the diagnosing the clutch fault according to a preset first diagnostic strategy specifically comprises:
calculating a difference value between the rotating speed of the engine and the target rotating speed of the clutch, and integrating the difference value with time to obtain a first monitoring target quantity;
and if the first monitoring target quantity is larger than a preset integral threshold value, diagnosing that the clutch has the fault of excessively high sliding friction rotating speed.
5. The method for diagnosing a slip fault of a wet dual clutch transmission according to claim 4, wherein the calculating a difference between an engine speed and a clutch target speed and integrating the difference with time to obtain a first monitoring target value specifically comprises:
calculating the difference value between the engine rotating speed and the clutch target rotating speed, and judging whether the difference value is smaller than the maximum sliding friction rotating speed in the driving mode;
if so, integrating the difference value with time to obtain the first monitoring target quantity;
and if not, integrating the maximum sliding grinding rotating speed and time to obtain the first monitoring target quantity.
6. The method for diagnosing the slip fault of the wet dual-clutch transmission according to claim 1, wherein the diagnosing the clutch fault according to the preset second diagnostic strategy specifically comprises:
calculating the difference value between the rotating speed of the engine and the actual rotating speed of the target clutch, and subtracting the first initial difference value from the difference value to obtain a second monitoring target quantity; the first initial difference value is the difference value between the engine speed at the moment when the gear shifting stage is just started and the actual speed of the target clutch;
and if the second monitoring target quantity is larger than a preset first speed difference threshold value and the gear shifting time exceeds a preset gear shifting time threshold value, diagnosing that the target clutch has the fault of high slip rotating speed.
7. The method for diagnosing the slip fault of the wet dual-clutch transmission according to claim 1, wherein the diagnosing the clutch fault according to a preset third diagnostic strategy specifically comprises:
calculating the difference value between the rotating speed of the engine and the actual rotating speed of the non-target clutch, and subtracting the second initial difference value from the difference value to obtain a third monitoring target quantity; the second initial difference value is the difference value between the engine speed at the beginning of entering the gear shifting stage and the actual speed of the non-target clutch;
and if the third monitoring target quantity is smaller than a preset second speed difference threshold value and the gear shifting time exceeds a preset gear shifting time threshold value, diagnosing that the non-target clutch has a low slip-friction speed fault.
8. A wet dual clutch transmission slip fault diagnostic apparatus comprising a controller configured to:
judging the current running state of the vehicle according to the real-time acquired vehicle working condition information;
when the current running state of the vehicle is judged to be the driving mode state, fault diagnosis is carried out on the clutch according to a preset first diagnosis strategy;
when the current running state of the vehicle is judged to be a gear shifting mode state and the current gear shifting type is power upshift or coasting downshift, performing fault diagnosis on the clutch according to a preset second diagnosis strategy;
and when the current running state of the vehicle is judged to be the gear shifting mode state and the current gear shifting type is power downshift or sliding upshift, performing fault diagnosis on the clutch according to a preset third diagnosis strategy.
9. The wet dual clutch transmission slip fault diagnostic device of claim 8, wherein the controller is further configured to:
and when the state of the engine rotating speed sensor is abnormal or the state of the clutch rotating speed sensor is abnormal, the fault diagnosis of the clutch is quitted.
10. The wet dual clutch transmission slip fault diagnostic device of claim 8, wherein the controller is further configured to:
and when the current running state of the vehicle is judged to be the gear shifting mode state and the current gear shifting type is power interruption gear shifting, quitting the fault diagnosis of the clutch.
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| CN202011028965.3A CN114251447B (en) | 2020-09-25 | 2020-09-25 | Wet type double-clutch transmission sliding mill fault diagnosis method and device |
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| CN202011028965.3A CN114251447B (en) | 2020-09-25 | 2020-09-25 | Wet type double-clutch transmission sliding mill fault diagnosis method and device |
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| CN114251447B CN114251447B (en) | 2023-05-30 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115214614A (en) * | 2022-08-01 | 2022-10-21 | 广州汽车集团股份有限公司 | Fault detection method and device, electronic equipment and readable medium |
| CN115247699A (en) * | 2022-05-19 | 2022-10-28 | 广州汽车集团股份有限公司 | Dual-clutch transmission failure prediction method and device, vehicle and storage medium |
| CN116360317A (en) * | 2023-03-30 | 2023-06-30 | 重庆长安汽车股份有限公司 | Method and system for generating control instruction of double clutch |
| CN116624472A (en) * | 2023-06-08 | 2023-08-22 | 中国第一汽车股份有限公司 | Diagnosis method for hydraulic system of double-clutch gearbox and automobile |
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| CN115214614B (en) * | 2022-08-01 | 2023-11-07 | 广州汽车集团股份有限公司 | Fault detection method, device, electronic equipment and readable medium |
| CN116360317A (en) * | 2023-03-30 | 2023-06-30 | 重庆长安汽车股份有限公司 | Method and system for generating control instruction of double clutch |
| CN116624472A (en) * | 2023-06-08 | 2023-08-22 | 中国第一汽车股份有限公司 | Diagnosis method for hydraulic system of double-clutch gearbox and automobile |
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