CN110873178B - Control method of automatic transmission during 'cradle' abuse operation of vehicle - Google Patents
Control method of automatic transmission during 'cradle' abuse operation of vehicle Download PDFInfo
- Publication number
- CN110873178B CN110873178B CN202010054272.5A CN202010054272A CN110873178B CN 110873178 B CN110873178 B CN 110873178B CN 202010054272 A CN202010054272 A CN 202010054272A CN 110873178 B CN110873178 B CN 110873178B
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- Prior art keywords
- clutch
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- oil
- speed
- gear
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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
- F16H61/04—Smoothing ratio shift
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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
- F16H61/18—Preventing unintentional or unsafe shift, e.g. preventing manual shift from highest gear to reverse gear
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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
- F16H61/04—Smoothing ratio shift
- F16H61/06—Smoothing ratio shift by controlling rate of change of fluid pressure
- F16H61/061—Smoothing ratio shift by controlling rate of change of fluid pressure using electric control means
- F16H2061/062—Smoothing ratio shift by controlling rate of change of fluid pressure using electric control means for controlling filling of clutches or brake servos, e.g. fill time, fill level or pressure during filling
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Transmission Device (AREA)
Abstract
The invention discloses a control method of an automatic transmission during misuse operation of a vehicle cradle, which comprises the following steps that when a TCU receives change of a position signal of a gear level, the vehicle speed condition judgment is carried out on the time of starting oil filling of an OC clutch: when the current vehicle speed of the vehicle is detected to be less than or equal to V1, no delay exists in gear shifting; after a gear command is received, normally draining oil by the OG clutch and normally filling oil by the OC clutch to finish gear shifting; when the current speed of the vehicle is detected to be greater than V2, after a gear command is received, normally draining oil by the OG clutch, and when the speed of the vehicle is reduced to V3, oil is filled by the OC clutch, and finally gear shifting is finished; when the vehicle speed signal cannot be detected, the rotating speed n of the output shaft is monitored, oil drainage of the OG clutch and oil filling of the OC clutch are controlled to complete gear shifting, damage to gearbox hardware caused by abuse operation is avoided, and the service life of the automatic transmission is maximized.
Description
Technical Field
The invention belongs to the technical field of automatic transmission control, and particularly relates to a control method of an automatic transmission during 'cradle' abuse operation of a vehicle.
Background
Cradle mode: one mode of vehicle abuse; when the vehicle is running, the driver changes the driving intention, and performs a switching operation of a gear opposite to the current running direction before the vehicle is not stopped (reverse gear is engaged during forward running, or forward gear is engaged during reverse running).
An OC clutch: OnComing clutch, refers to the clutch that will carry on the oil-filled action;
an OG clutch: an OffGoing clutch, which refers to a clutch to be subjected to oil drainage action;
if a gear shifting switching operation opposite to the driving direction is carried out in the driving process (from an R gear to a D gear or from the D gear to the R gear), oil drainage is finished by the OG clutch, the vehicle speed is still in a high state at the moment, if the OC clutch is filled with oil immediately, not only is gear shifting impact accompanied, but also the load of the clutch is increased suddenly at the moment, irreversible damage can be caused to the hardware of the gearbox, a friction plate of the clutch can be sintered under the extreme condition, parts are invalid, and the transmission is scrapped.
In order to prevent the above situation, the following measures exist in the prior art:
when the transmission enters the R gear, a physical safety lock is added, and the P gear of the vehicle can be entered only after the physical safety lock is manually opened.
The inventor finds that the prior art has the following defects: the above situation is a mistake-proof and abuse-proof measure carried out by a physical hardware means, and the damage of the transmission is still caused by the operation that a person mistakenly opens a physical safety lock to enter the R gear in the running process of the vehicle.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a control method of an automatic transmission during misuse operation of a vehicle cradle, which overcomes the defects of the existing control method, and after the control method is adopted, the control logic in TCU software judges the time for starting oil filling of an OC clutch according to a vehicle speed signal, a gear signal and the like, so that the clutch forming a command gear when the gear switching operation opposite to the current driving direction is carried out by a driver under the condition that the vehicle speed is not zero is prevented from instantly increasing the load after oil filling is combined to cause friction plate sintering and damage a gearbox.
In order to solve the technical problems, the technical scheme of the invention is as follows: a method for controlling an automatic transmission during a "cradle" abuse operation of a vehicle, comprising the steps of:
when the vehicle speed is not zero and the driver performs R → D or D → R gear shifting operation, and the TCU receives the gear shifting lever position signal (command gear) to change, the oil drainage of the OG clutch is carried out, and simultaneously the time for starting oil filling of the OC clutch is controlled according to the vehicle speed.
An optimization scheme is characterized in that a TCU receives a gear signal change command, the current speed of a vehicle is detected, if the speed of the vehicle is less than or equal to V1, a control method is not involved, oil is drained from an OG clutch normally, oil is filled into an OC clutch normally, gear shifting is completed, and gear shifting is not delayed in the process.
If the current vehicle speed is detected to be greater than V2, normal oil drainage of the OG clutch is detected, the vehicle speed is controlled to be reduced to V3, the OC clutch starts oil filling, and finally gear shifting is completed.
According to the optimization scheme, when a vehicle speed signal cannot be detected, the rotating speed n of an output shaft with the direction is detected, and the driving direction and the driving speed are monitored simultaneously; to assist in controlling the point in time for oil drain of the OG clutch and oil fill of the OC clutch to complete the shift.
The rotating speed of the output shaft is as follows:
wherein, n: output shaft rotational speed (r/s), v: vehicle speed (m/s), r: tire radius (m).
In an optimized scheme, V1, V2 and V3 are generally set to be 5km/h, and can also be calibrated independently.
By adopting the technical scheme, compared with the prior art, the invention has the following advantages: the condition judgment that the target gear OC clutch starts to charge oil is provided in TCU software under the working condition that the speed of the whole vehicle is high and the gear shift lever is hung at the position opposite to the current driving direction, so that the damage of abuse operation on the hardware of the gearbox is solved, and the service life of the automatic transmission is maximized. Although the gear shifting time is prolonged under a specific working condition, the gear shifting device plays a great role in protecting the hardware of the gearbox, and simultaneously ensures that the driving smoothness is free from impact and jitter by delaying gear shifting when the vehicle speed is high.
Drawings
FIG. 1 is a graph of shift oil pressure change during "abuse" shifting in low-speed driving;
FIG. 2 is a graph of shift oil pressure change at present for "abuse" shifting at higher vehicle speeds;
FIG. 3 is a graph of shift oil pressure change during intervention of the control method for "abuse" shifting at higher vehicle speeds 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 will be described with reference to the accompanying drawings, and it will be understood by those skilled in the art that the following should not be construed as limiting the scope of the present invention.
Embodiment, as shown in fig. 1 and 3, a method of controlling an automatic transmission during a "cradle" abuse operation of a vehicle includes the steps of;
when the vehicle speed is not zero and the driver performs R → D or D → R gear shifting operation, and the TCU receives the gear shifting lever position signal (command gear) to change, the oil drainage of the OG clutch is carried out, and simultaneously the time for starting oil filling of the OC clutch is controlled according to the vehicle speed.
The TCU receives a gear signal change command, starts to detect the current speed of the vehicle, and if the speed of the vehicle is less than or equal to V1, the control method is not involved, oil is drained normally through the OG clutch, oil is filled normally through the OC clutch, gear shifting is completed, and gear shifting is not delayed in the process.
If the vehicle speed is greater than V2, normally draining oil by the OG clutch, controlling the vehicle speed to be reduced to V3, starting oil filling by the OC clutch, and finally finishing gear shifting, wherein the gear shifting delay exists in the process.
V1, V2, V3 are typically set at 5km/h, and may also be individually calibrated.
When the vehicle speed signal cannot be detected, detecting the rotating speed n of the output shaft with the direction, and simultaneously monitoring the driving direction and the driving speed; to assist in controlling the point in time for oil drain of the OG clutch and oil fill of the OC clutch to complete the shift.
The rotating speed of the output shaft is as follows:
the formula:
，
wherein, n: output shaft rotational speed (r/s), v: vehicle speed (m/s), r: tire radius (m).
The time between the commanded gear and the actual gear state change is collectively referred to as the shift time; the rotating speed (belt direction) of the output shaft is recorded as positive when the output shaft normally moves forward in TCU software, and the rotating speed of the output shaft is recorded as negative when the vehicle is in reverse gear; the control method prolongs certain gear shifting time under specific working conditions, but plays a great role in protecting the hardware of the gearbox, and simultaneously ensures the smoothness of gear shifting.
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 (3)
1. A method for controlling an automatic transmission during a "cradle" abuse operation of a vehicle, comprising the steps of:
when the vehicle speed is not zero and the driver performs R → D or D → R gear shift operation, and the TCU receives the gear shift lever position signal to change, the oil leakage of the OG clutch is carried out, and simultaneously the time for starting oil filling of the OC clutch is controlled according to the vehicle speed:
the TCU receives a gear signal change command, starts to detect the current speed of the vehicle, and if the speed is less than or equal to V1, the control method is not involved, oil is drained normally through the OG clutch, oil is filled normally through the OC clutch, gear shifting is completed, and gear shifting is not delayed in the process;
if the current speed is detected to be greater than V2, normally draining oil by the OG clutch, controlling the speed to be reduced to V3, starting oil filling by the OC clutch, and finally finishing gear shifting;
v1, V2, V3 were set at 5 km/h.
2. A method of controlling an automatic transmission in a cradle abuse operation of a vehicle according to claim 1, wherein:
when the vehicle speed signal cannot be detected, detecting the rotating speed n of the output shaft with the direction, and simultaneously monitoring the driving direction and the driving speed; to assist in controlling the point in time for oil drain of the OG clutch and oil fill of the OC clutch to complete the shift.
3. A method of controlling an automatic transmission in a cradle abuse operation of a vehicle according to claim 2, characterized by:
the rotating speed of the output shaft is as follows:
wherein, n: output shaft rotational speed (r/s), v: vehicle speed (m/s), r: tire radius (m).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010054272.5A CN110873178B (en) | 2020-01-17 | 2020-01-17 | Control method of automatic transmission during 'cradle' abuse operation of vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010054272.5A CN110873178B (en) | 2020-01-17 | 2020-01-17 | Control method of automatic transmission during 'cradle' abuse operation of vehicle |
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| CN110873178A CN110873178A (en) | 2020-03-10 |
| CN110873178B true CN110873178B (en) | 2020-06-05 |
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| CN202010054272.5A Active CN110873178B (en) | 2020-01-17 | 2020-01-17 | Control method of automatic transmission during 'cradle' abuse operation of vehicle |
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| CN112524239B (en) * | 2020-12-08 | 2022-04-26 | 潍柴动力股份有限公司 | Control method and system of clutch |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0552900A1 (en) * | 1992-01-23 | 1993-07-28 | Eaton Corporation | Range section actuator control system and method for preventing damage to range section synchronizers |
| CN104662340A (en) * | 2012-09-26 | 2015-05-27 | 加特可株式会社 | Automatic transmission equipped with friction element having locking mechanism attached thereto, and control method therefor |
| CN106438992A (en) * | 2016-11-09 | 2017-02-22 | 盛瑞传动股份有限公司 | Control method of gear locking mechanism capable of preventing automatic gearbox misoperation |
| CN106917866A (en) * | 2015-12-28 | 2017-07-04 | 长城汽车股份有限公司 | The shift control method of speed changer, device and vehicle |
| CN108331917A (en) * | 2017-01-17 | 2018-07-27 | 丰田自动车株式会社 | The shift controller of vehicle |
| CN108799483A (en) * | 2018-07-06 | 2018-11-13 | 盛瑞传动股份有限公司 | The deliberately guard method of damage automatic transmission |
| CN108869731A (en) * | 2017-05-12 | 2018-11-23 | 丰田自动车株式会社 | The control device of vehicle |
| CN109854735A (en) * | 2019-03-27 | 2019-06-07 | 江铃汽车股份有限公司 | A kind of new A/T gear position switchover policy |
-
2020
- 2020-01-17 CN CN202010054272.5A patent/CN110873178B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0552900A1 (en) * | 1992-01-23 | 1993-07-28 | Eaton Corporation | Range section actuator control system and method for preventing damage to range section synchronizers |
| CN104662340A (en) * | 2012-09-26 | 2015-05-27 | 加特可株式会社 | Automatic transmission equipped with friction element having locking mechanism attached thereto, and control method therefor |
| CN106917866A (en) * | 2015-12-28 | 2017-07-04 | 长城汽车股份有限公司 | The shift control method of speed changer, device and vehicle |
| CN106438992A (en) * | 2016-11-09 | 2017-02-22 | 盛瑞传动股份有限公司 | Control method of gear locking mechanism capable of preventing automatic gearbox misoperation |
| CN108331917A (en) * | 2017-01-17 | 2018-07-27 | 丰田自动车株式会社 | The shift controller of vehicle |
| CN108869731A (en) * | 2017-05-12 | 2018-11-23 | 丰田自动车株式会社 | The control device of vehicle |
| CN108799483A (en) * | 2018-07-06 | 2018-11-13 | 盛瑞传动股份有限公司 | The deliberately guard method of damage automatic transmission |
| CN109854735A (en) * | 2019-03-27 | 2019-06-07 | 江铃汽车股份有限公司 | A kind of new A/T gear position switchover policy |
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| CN110873178A (en) | 2020-03-10 |
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Inventor after: Wang Hongzhi Inventor after: Liu Qiang Inventor after: Cao Yong Inventor after: Yang Lei Inventor after: Zong Wei Inventor after: Guo Taimin Inventor after: Wang Shengtao Inventor after: Li Zhizong Inventor before: Wang Hongzhi Inventor before: Liu Qiang Inventor before: Cao Yong Inventor before: Yang Lei Inventor before: Zong Wei Inventor before: Guo Taimin Inventor before: Wang Shengtao Inventor before: Li Zongzhi |
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