CN110985662A - Control method for preventing clutch fault of automatic transmission - Google Patents
Control method for preventing clutch fault of automatic transmission Download PDFInfo
- Publication number
- CN110985662A CN110985662A CN202010126227.6A CN202010126227A CN110985662A CN 110985662 A CN110985662 A CN 110985662A CN 202010126227 A CN202010126227 A CN 202010126227A CN 110985662 A CN110985662 A CN 110985662A
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- CN
- China
- Prior art keywords
- clutch
- value
- automatic transmission
- gear
- failure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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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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- 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
- F16H2061/1216—Display or indication of detected 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
- F16H2061/1224—Adapting to failures or work around with other constraints, e.g. circumvention by avoiding use of failed parts
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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
- F16H2061/1232—Bringing the control into a predefined state, e.g. giving priority to particular actuators or gear ratios
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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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Transmission Device (AREA)
Abstract
The invention discloses a control method for preventing a clutch of an automatic transmission from being in fault, which comprises a fault monitoring step and a priority gear selecting step; when the neutral gear is detected, the vehicle and the transmission are in normal states, the difference value of the rotating speeds of the engine and the turbine is detected, the absolute value of the difference value is compared with the standard value, when the absolute value of the difference value is larger than or equal to the standard value, the clutch is controlled to form a fixed gear, the vehicle runs according to the fixed gear, abnormal combination faults of the clutch inside the transmission can be diagnosed in advance, gear priority selection is carried out, a user can still drive or maintain the transmission, secondary damage to the transmission is avoided, and operation is more flexible.
Description
Technical Field
The invention belongs to the technical field of automatic transmission control, and particularly relates to a control method for preventing a clutch of an automatic transmission from being in fault.
Background
Current 6-to 8-speed Automatic Transmissions (AT) with a hydrodynamic torque converter usually consist of five shift elements, 1 brake B1, 4 clutches C1, C2, C3, C4, the brake being a special clutch and therefore hereinafter referred to collectively as a clutch, i.e. 5 clutches in total, and therefore 5 solenoid valve clutch controls.
FIG. 1 is a logic diagram of the gears of a current automatic transmission, wherein 3 clutches corresponding to each gear are labeled, for example, gear 1 requires B1, C1 and C4 to be closed, and gear 5 requires C1, C2 and C4 to be closed; to quickly enter forward or reverse gear when in neutral, both clutches (B1, C4) are normally held engaged when in neutral.
FIG. 2 is a logic timing diagram of the difference between the engine speed and the turbine speed when the current clutch is not normally engaged, when the automatic transmission is in neutral without failure, the throttle signal is zero, and only two clutches (B1 and C4) are engaged, the torque cannot be transmitted, and at this time, the turbine end of the hydraulic torque converter is unloaded, and the engine speed is close to the turbine speed. When the other clutches (C1, C2, C3) are abnormally combined and fail, the engine speed and the turbine speed have large speed difference, and the gearbox can generate impact or cause neutral driving failure.
In the process of implementing the invention, the inventor finds that the prior art has at least the following defects: further damage during transmission use is caused by the lack of fail-safe measures when the clutch is not properly engaged.
At present, automatic transmissions with hydraulic torque converters at home and abroad have no method for diagnosing and protecting the working condition in advance.
Disclosure of Invention
The invention aims to solve the technical problem of providing a control method for preventing the clutch of the automatic transmission from being failed, overcoming the defects of the existing control method, realizing the neutral gear engagement after the vehicle is stopped, judging the abnormal combination failure of the clutch by monitoring the difference value of the rotating speed of an engine and the rotating speed of a turbine, and carrying out gear priority selection protection measures to avoid causing secondary damage of the transmission.
In order to solve the technical problems, the technical scheme of the invention is as follows: a control method for preventing a clutch failure of an automatic transmission includes a failure monitoring step and a priority gear selection step;
when the neutral gear is detected, the vehicle and the transmission are in normal states, the difference value of the rotating speeds of the engine and the turbine is detected, the absolute value of the difference value is compared with the standard value, when the absolute value of the difference value is larger than or equal to the standard value, the clutch is controlled to form a fixed gear, and the vehicle runs according to the fixed gear.
An optimization scheme, the fault monitoring step comprises:
in step S1, detecting whether the working state of the vehicle is normal, including the vehicle is in a starting and stopping state, the engine speed is normal, the throttle signal is normal and the throttle signal is zero, if yes, entering step S2, otherwise, ending;
in step S2, detecting whether the operating state of the automatic transmission is normal, including that the transmission is in neutral and the turbine speed is normal, if yes, entering step S3, otherwise, ending;
in step S3, the engine speed and the turbine speed are detected, and the absolute value of the difference is calculated, and then the process proceeds to step S4;
in step S4, it is determined whether the absolute value of the difference is greater than or equal to a calibrated value, if so, it indicates that at least one of the clutches C1, C2, C3 has an abnormally combined fault and step S5 is entered, otherwise, it is ended;
step S5, prompt "clutch not normally engaged failure".
In an optimization scheme, the priority gear selection step comprises the following steps:
in step S6, when the "abnormal engagement failure of the clutches" is detected, the TCU control clutches C1, C2, and C3 are engaged to form the fixed gear Dn, and the other clutches B1 and C4 are disengaged, so that the vehicle travels in the fixed gear Dn.
One optimization, calibration is 400.
By adopting the technical scheme, compared with the prior art, the invention has the following advantages: abnormal combination faults of the clutch in the gearbox can be diagnosed in advance, gear preference is carried out, a user can still drive or maintain, secondary damage to the gearbox is avoided, and operation is more flexible.
Drawings
FIG. 1 is a present clutch automatic transmission shift logic diagram;
FIG. 2 is a timing diagram illustrating the difference between engine speed and turbine speed when the clutch is not engaged;
FIG. 3 is a flow chart of a control method for preventing an automatic transmission clutch failure in an embodiment of the present invention.
Detailed Description
In order to more clearly understand the technical features, objects and effects of the present invention, the embodiments of the present invention are described with reference to the accompanying drawings, and it should be understood by those skilled in the art that the following does not limit the scope of the present invention.
In an embodiment, as shown in fig. 3, a control method for preventing clutch failure of an automatic transmission is provided, in which a torque converter is arranged at the front end of the automatic transmission, the front end of the torque converter is a pump impeller which is synchronous with the rotation speed of an output end of an engine, and the rear end of the torque converter is a turbine impeller which is rigidly connected with an input shaft of the transmission and is synchronous with the rotation speed.
The control method comprises a fault monitoring step and a priority gear selection step, wherein the vehicle and the transmission are in a normal state when neutral gear is detected, the difference value of the rotating speeds of the engine and the turbine is detected, the absolute value of the difference value is compared with a calibrated value, when the absolute value of the difference value is larger than or equal to the calibrated value, the clutch is controlled to form a fixed gear, and the vehicle runs according to the fixed gear.
Specifically, the fault monitoring step includes:
in step S1, detecting whether the working state of the vehicle is normal, including the vehicle is in a starting and stopping state, the engine speed is normal, the throttle signal is normal and the throttle signal is zero, if yes, entering step S2, otherwise, ending;
in step S2, detecting whether the operating state of the automatic transmission is normal, including that the transmission is in neutral and the turbine speed is normal, if yes, entering step S3, otherwise, ending;
in step S3, the engine speed and the turbine speed are detected, and the absolute value of the difference is calculated, and then the process proceeds to step S4;
in step S4, it is determined whether the absolute value of the difference is greater than or equal to a calibrated value, if so, it indicates that at least one of the three clutches C1, C2, C3 other than the two clutches B1, C4 required for neutral has an abnormally combined fault and proceeds to step S5, otherwise, it ends;
step S5, the user is prompted for "clutch improper engagement failure".
The priority gear selecting step comprises the following steps:
and step S6, when the 'abnormal clutch combination fault' is detected, the TCU controls the three clutches C1, C2 and C3 to be combined to form a fixed gear Dn, the two clutches B1 and C4 required by other neutral gears are opened, the vehicle runs according to the fixed gear Dn, and a user drives the vehicle.
The calibration value is denoted by a and is generally set to 400, and different gearboxes have different calibration values and can be specifically set according to the gearboxes.
The foregoing is illustrative of the best mode of the invention and details not described herein are within the common general knowledge of a person of ordinary skill in the art. The scope of the present invention is defined by the appended claims, and any equivalent modifications based on the technical teaching of the present invention are also within the scope of the present invention.
Claims (4)
1. A control method for preventing a clutch failure of an automatic transmission includes a failure monitoring step and a priority gear selection step;
when the neutral gear is detected, the vehicle and the transmission are in normal states, the difference value of the rotating speeds of the engine and the turbine is detected, the absolute value of the difference value is compared with the standard value, when the absolute value of the difference value is larger than or equal to the standard value, the clutch is controlled to form a fixed gear, and the vehicle runs according to the fixed gear.
2. The control method for preventing a clutch failure of an automatic transmission according to claim 1, wherein the failure monitoring step includes:
in step S1, detecting whether the working state of the vehicle is normal, including the vehicle is in a starting and stopping state, the engine speed is normal, the throttle signal is normal and the throttle signal is zero, if yes, entering step S2, otherwise, ending;
in step S2, detecting whether the operating state of the automatic transmission is normal, including that the transmission is in neutral and the turbine speed is normal, if yes, entering step S3, otherwise, ending;
in step S3, the engine speed and the turbine speed are detected, and the absolute value of the difference is calculated, and then the process proceeds to step S4;
in step S4, it is determined whether the absolute value of the difference is greater than or equal to a calibrated value, if so, it indicates that at least one of the clutches C1, C2, C3 has an abnormally combined fault and step S5 is entered, otherwise, it is ended;
step S5, prompt "clutch not normally engaged failure".
3. The control method for preventing a clutch failure of an automatic transmission according to claim 1, wherein the priority gear selection step includes:
in step S6, when the "abnormal engagement failure of the clutches" is detected, the TCU control clutches C1, C2, and C3 are engaged to form the fixed gear Dn, and the other clutches B1 and C4 are disengaged, so that the vehicle travels in the fixed gear Dn.
4. The control method for preventing a clutch failure of an automatic transmission according to claim 2, wherein the calibration value is 400.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010126227.6A CN110985662A (en) | 2020-02-28 | 2020-02-28 | Control method for preventing clutch fault of automatic transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010126227.6A CN110985662A (en) | 2020-02-28 | 2020-02-28 | Control method for preventing clutch fault of automatic transmission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110985662A true CN110985662A (en) | 2020-04-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010126227.6A Pending CN110985662A (en) | 2020-02-28 | 2020-02-28 | Control method for preventing clutch fault of automatic transmission |
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| Country | Link |
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| CN (1) | CN110985662A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113267334A (en) * | 2021-07-19 | 2021-08-17 | 盛瑞传动股份有限公司 | Method and device for judging hydraulic automatic transmission fault, vehicle and storage medium |
| CN113738864A (en) * | 2021-09-29 | 2021-12-03 | 蜂巢传动科技河北有限公司 | AT transmission control method and system, AT transmission and vehicle |
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| US5599254A (en) * | 1994-02-09 | 1997-02-04 | Unisia Jecs Corporation | Method and apparatus for diagnosing a fault in a lock-up mechanism of a torque converter fitted to an automatic transmission |
| JP2003269602A (en) * | 2002-03-18 | 2003-09-25 | Aisin Aw Co Ltd | Control device of automatic transmission |
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| CN110439994A (en) * | 2018-05-02 | 2019-11-12 | 通用汽车环球科技运作有限责任公司 | Converter clutch position is assessed based on accumulation slippage |
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2020
- 2020-02-28 CN CN202010126227.6A patent/CN110985662A/en active Pending
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| US5599254A (en) * | 1994-02-09 | 1997-02-04 | Unisia Jecs Corporation | Method and apparatus for diagnosing a fault in a lock-up mechanism of a torque converter fitted to an automatic transmission |
| US5520586A (en) * | 1995-06-06 | 1996-05-28 | Ford Motor Company | Adaptive control for automatic transmission engagement |
| JP2003269602A (en) * | 2002-03-18 | 2003-09-25 | Aisin Aw Co Ltd | Control device of automatic transmission |
| CN1497251A (en) * | 2002-10-11 | 2004-05-19 | 丰田自动车株式会社 | Device and method for determining fault of automatic transmission |
| CN101111699A (en) * | 2005-01-25 | 2008-01-23 | 格特拉格传动机构和齿轮工厂赫尔曼·哈根迈尔有限公司&两合公司 | Multi-step variable speed transmission and method controlling to detect failure thereof |
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| KR20080051419A (en) * | 2006-12-05 | 2008-06-11 | 현대자동차주식회사 | Method for diagnosing malfunction of damper clutch |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113267334A (en) * | 2021-07-19 | 2021-08-17 | 盛瑞传动股份有限公司 | Method and device for judging hydraulic automatic transmission fault, vehicle and storage medium |
| CN113738864A (en) * | 2021-09-29 | 2021-12-03 | 蜂巢传动科技河北有限公司 | AT transmission control method and system, AT transmission and vehicle |
| CN113738864B (en) * | 2021-09-29 | 2022-10-28 | 蜂巢传动科技河北有限公司 | AT transmission control method and system, AT transmission and vehicle |
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