CN114776801A - Feed-forward control method for clutch pressure in automatic transmission garage shifting gear shifting - Google Patents
Feed-forward control method for clutch pressure in automatic transmission garage shifting gear shifting Download PDFInfo
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- CN114776801A CN114776801A CN202210406663.8A CN202210406663A CN114776801A CN 114776801 A CN114776801 A CN 114776801A CN 202210406663 A CN202210406663 A CN 202210406663A CN 114776801 A CN114776801 A CN 114776801A
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- shifting
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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
- F16H61/04—Smoothing ratio shift
- F16H61/06—Smoothing ratio shift by controlling rate of change of fluid pressure
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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
- F16H61/065—Smoothing ratio shift by controlling rate of change of fluid pressure using fluid control means
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Control Of Transmission Device (AREA)
Abstract
A feedforward control method for clutch pressure in automatic transmission garage shifting belongs to the technical field of automatic transmissions. The pressure of a hydraulic system of the transmission is between 8 and 10bar, the pressure of an internal brake of the automatic transmission is between 1.5 and 1.8bar, and the time is between 0.5 and 1 s; when the TCU identifies the change of the gear signal, the pressure of a main oil circuit of the hydraulic system and the pressure of an internal brake of the automatic transmission are increased; the first stage of garage shifting, namely controlling the pre-charging time of a shifting clutch in the automatic transmission and maintaining the kisspeint point time; in the first half part of the second stage of the garage shifting and gear shifting, the change of the turbine speed of the automatic transmission reaches 50 percent of the progress of the second stage of the garage shifting and gear shifting, the target electromagnetic valve current is calculated to be used as a target feedforward value, the electromagnetic valve current is transited to the target feedforward value within the calibratable time, and the whole progress of the second stage of the garage shifting and gear shifting is completed; and in the third stage of garage shifting and gear shifting, the pressure of a gear shifting clutch inside the automatic transmission is quickly increased to complete gear shifting. The invention is used for the feedforward control of the clutch pressure in the automatic transmission garage shifting.
Description
Technical Field
The invention belongs to the technical field of automatic transmissions, and particularly relates to a feed-forward control method for clutch pressure in automatic transmission garage shifting.
Background
Currently, most garage shift pressure control on AT transmissions (automatic transmissions) uses a combination of open loop slope control and closed loop PID control. However, when dealing with gear shifting with different engine torques, such a control method may cause insufficient or excessive pressure during the gear shifting process.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide a feed-forward control method for clutch pressure in automatic transmission garage shifting.
The invention provides a feed-forward control method of clutch pressure in the shifting process of an automatic transmission garage, which is used for ensuring that the pressure in the shifting process of the garage is always in a proper level under different engine torques.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for feed-forward control of clutch pressure in automatic transmission garage shifts, said method comprising the steps of:
the method comprises the following steps: firstly, the pressure of a hydraulic system of the transmission is required to be kept between 8 and 10bar, the pressure of an internal brake of the automatic transmission is kept between 1.5bar and 1.8bar, and the time is kept between 0.5 and 1 s;
step two: when the TCU identifies the gear signal change, the pressure of a main oil circuit of the hydraulic system and the pressure of a brake in the automatic transmission are quickly increased by 1.5-2.5 times on the basis of the original pressure;
step three: in the first stage of garage shifting, controlling the pre-charging time of an internal clutch of the automatic transmission and the time for keeping a kisspeint point in two stages, wherein the pre-charging time is 0.1s-0.15s, and the time for keeping the kisspeint point is 0.25s-0.3 s;
step four: in the first half part of the second stage of the garage shifting gear shifting, the current of the electromagnetic valve corresponding to the clutch in the automatic transmission is increased by a fixed slope until the change of the turbine rotating speed of the automatic transmission reaches 50% of the process of the second stage of the garage shifting gear shifting, then the current of the target electromagnetic valve under the current engine torque is calculated according to the basic characteristics of the clutch to be used as a target feedforward value, the current of the electromagnetic valve is transited to the target feedforward value within the calibratable time, and meanwhile, the current of the electromagnetic valve is matched with closed-loop PID adjustment until the change of the turbine rotating speed of the transmission completes the whole process of the second stage of the garage shifting gear shifting;
step five: in the third stage of garage shifting, the pressure of the clutch inside the automatic transmission is quickly raised to complete shifting.
Further, in step four, the calculation method of the second stage process of garage shifting and gear shifting comprises the following steps: the shift schedule is (current turbine speed-pre-shift target turbine speed)/(pre-shift target turbine speed-post-shift target turbine speed).
Further, in the fourth step, the target feedforward value is calculated by: target feedforward value ═ clutch TP characteristic point + delta; wherein: delta indicates calibratable adjustment.
Compared with the prior art, the invention has the beneficial effects that:
1. aiming at ensuring the gear shifting smoothness and responsiveness in the automatic transmission garage shifting process, the invention designs a control strategy by analyzing the characteristics of a hydraulic system, so as to more accurately control the pressure in the garage shifting process and improve the gear shifting quality.
2. The invention can effectively improve the problems of gear shifting pause and impact caused by the change of conditions such as an accelerator, rotating speed and the like in the garage shifting process, can ensure that the pressure of the clutch always follows the change of torque and rotating speed through feedforward regulation, ensures that the change of the rotating speed of the turbine is smooth in the whole gear shifting process, the gear shifting feeling is smooth, and the pressure is always in a proper level.
Drawings
FIG. 1 is a control diagram of a garage shift process using a feed forward control method of clutch pressure in an automatic transmission garage shift of the present invention.
In the figure: first stage of gear shifting; representing a second stage of gear shifting; indicating a third gear shifting stage; fourthly, representing a signal of a gear shifting handle; indicating that the shift handle is shifted from P or N to D or R gear; sixthly, representing a turbine rotating speed signal; seventhly, the current of the main oil pressure solenoid valve is represented; indicating the current of the electromagnetic valve of the internal brake of the automatic transmission; ninthly, representing the current of the electromagnetic valve of the clutch inside the automatic transmission; the inside of the automatic transmission is indicated by the control of pre-charging of the clutch;
indicating that the automatic transmission internal clutch remains at the kisssopoint;
represents the automatic transmission internal clutch open loop slope control to the turbine speed change to 50% of the process;
the current of the electromagnetic valve of the clutch inside the automatic transmission is shown to be transited to a target feedforward value within a specified time through feedforward control, and the current and the closed-loop PID regulation jointly act to complete a whole process of rotating speed change;
the pressure of the clutch inside the automatic transmission is rapidly increased to complete the gear shifting in the third stage.
Detailed Description
The first embodiment is as follows: as shown in fig. 1, the present embodiment describes a feed-forward control method of clutch pressure in automatic transmission garage shifts, the method including the steps of:
the method comprises the following steps: firstly, the pressure of a hydraulic system of the transmission is required to be kept between 8 and 10bar, the pressure of an internal brake of the automatic transmission is kept between 1.5bar and 1.8bar, and the time is kept between 0.5 and 1 s; the function of this step is to ensure that the main oil circuit completes pressure build-up before the gear shift begins.
Step two: when the TCU (transmission control unit) identifies the change of gear signals, the pressure of a main oil circuit of a hydraulic system and the pressure of a brake in the automatic transmission are quickly increased by 1.5-2.5 times on the basis of the original pressure; the function of this step is to ensure that the main line pressure is sufficient to support the completion of the shift during the shift.
Step three: in the first stage of garage shifting (P \ N-D \ R, namely, the gear is shifted into a D or R gear from P or N), the pre-charging time of an internal clutch of the automatic transmission and the time for keeping a kisspeint point (half-clutch point) are controlled in two stages, wherein the pre-charging time is 0.1s-0.15s, and the time for keeping the kisspeint point (half-clutch point) is 0.25s-0.3 s; the function of this stage is to ensure that the first stage of the shift is pressure build and is in a partially engaged state.
Step four: in the first half part of the second stage of garage shifting (P \ N-D \ R, namely, the gear is shifted into D or R by P or N), the current of the electromagnetic valve corresponding to the clutch in the automatic transmission is increased by a fixed slope (a calibratable slope) until the change of the turbine speed of the automatic transmission reaches 50% of the process of the second stage of garage shifting, then the current of the target electromagnetic valve under the current engine torque is calculated according to the basic characteristics of the clutch to be used as a target feedforward value, the current of the electromagnetic valve is transited to the target feedforward value within the calibratable time, and meanwhile, the current of the electromagnetic valve is adjusted by matching with a closed-loop PID (proportional integral derivative control) until the change of the turbine speed of the transmission completes the whole process of the second stage of garage shifting; the step has the function of ensuring that the second gear shifting stage can change the rotating speed of the turbine of the transmission to form a D gear or R gear speed ratio.
The calculation method of the second stage process of garage transfer and gear shift comprises the following steps: the shift schedule is (current turbine speed-pre-shift target turbine speed)/(pre-shift target turbine speed-post-shift target turbine speed).
The calculation method of the target feedforward value comprises the following steps: target feedforward value ═ clutch TP characteristic point + delta; wherein: delta indicates calibratable adjustment.
Step five: in the third stage of garage shifting (P \ N-D \ R, namely shifting from P or N to D or R gear), the pressure of the clutch in the automatic transmission is rapidly increased to complete shifting; the step has the function of ensuring that the clutch can be completely pressed after the gear shifting is finished, and the slipping phenomenon does not occur.
The above embodiments are merely illustrative of the present patent and do not limit the scope of the patent, and those skilled in the art can make modifications to the parts thereof without departing from the spirit and scope of the patent.
Claims (3)
1. A feed-forward control method for clutch pressure in automatic transmission garage shifting is characterized in that: the method comprises the following steps:
the method comprises the following steps: firstly, the pressure of a hydraulic system of the transmission is kept between 8 and 10bar, the pressure of an internal brake of the automatic transmission is kept between 1.5bar and 1.8bar, and the time is kept between 0.5 and 1 s;
step two: when the TCU identifies the change of the gear signal, the pressure of a main oil circuit of a hydraulic system and the pressure of a brake in the automatic transmission are quickly increased by 1.5-2.5 times on the basis of the original pressure;
step three: in the first stage of shifting the gear, controlling the pre-charging time of an internal clutch of the automatic transmission and keeping the time of a kisspeint point in two stages, wherein the pre-charging time is 0.1s-0.15s, and the time of the kisspeint point is 0.25s-0.3 s;
step four: in the first half part of the second stage of the garage shifting gear shifting, the current of the electromagnetic valve corresponding to the clutch in the automatic transmission is increased by a fixed slope until the change of the turbine speed of the automatic transmission reaches 50% of the process of the second stage of the garage shifting gear shifting, then the current of the target electromagnetic valve under the current engine torque is calculated according to the basic characteristics of the clutch and is used as a target feedforward value, the current of the electromagnetic valve is transited to the target feedforward value within the calibratable time, and meanwhile, the closed-loop PID regulation is matched until the change of the turbine speed of the transmission completes the whole process of the second stage of the garage shifting gear shifting;
step five: in the third stage of garage shifting, the pressure of the clutch inside the automatic transmission is quickly raised to complete shifting.
2. A feed-forward control method of clutch pressure in automatic transmission garage shifts as set forth in claim 1, characterized in that: in the fourth step, the calculation method of the second stage process of garage shifting comprises the following steps: the shift schedule is (current turbine speed-pre-shift target turbine speed)/(pre-shift target turbine speed-post-shift target turbine speed).
3. A feed-forward control method of clutch pressure in automatic transmission garage shifts according to claim 1 or 2, characterized in that: in the fourth step, the calculation method of the target feedforward value comprises the following steps: the target feedforward value is clutch TP characteristic point + delta; wherein: delta denotes calibratable adjustment.
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| CN202210406663.8A CN114776801B (en) | 2022-04-18 | 2022-04-18 | Feedforward control method for clutch pressure in automatic transmission garage shifting |
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| CN202210406663.8A CN114776801B (en) | 2022-04-18 | 2022-04-18 | Feedforward control method for clutch pressure in automatic transmission garage shifting |
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| CN114776801B CN114776801B (en) | 2024-03-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117006241A (en) * | 2023-09-19 | 2023-11-07 | 哈尔滨东安汽车发动机制造有限公司 | PID control method of clutch pressure during automatic transmission power downshift |
| CN117823619A (en) * | 2024-03-06 | 2024-04-05 | 成都赛力斯科技有限公司 | Clutch control method, device and vehicle |
| CN119878809A (en) * | 2025-01-02 | 2025-04-25 | 潍柴动力股份有限公司 | Gear shifting control method, system, equipment and storage medium for gearbox |
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| CN112443657A (en) * | 2021-02-01 | 2021-03-05 | 北京航空航天大学 | Main oil circuit pressure control method for preventing clutch from slipping in quick oil filling stage |
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2022
- 2022-04-18 CN CN202210406663.8A patent/CN114776801B/en active Active
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| US6155949A (en) * | 1999-06-14 | 2000-12-05 | General Motors Corporation | Multiple gain trim valve for a selectively engageable friction device |
| US20100211275A1 (en) * | 2009-02-13 | 2010-08-19 | Toyota Jidosha Kabushiki Kaisha | Control device of vehicular automatic transmission and method of controlling the same |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117006241A (en) * | 2023-09-19 | 2023-11-07 | 哈尔滨东安汽车发动机制造有限公司 | PID control method of clutch pressure during automatic transmission power downshift |
| CN117823619A (en) * | 2024-03-06 | 2024-04-05 | 成都赛力斯科技有限公司 | Clutch control method, device and vehicle |
| CN117823619B (en) * | 2024-03-06 | 2024-04-30 | 成都赛力斯科技有限公司 | Clutch control method and device and vehicle |
| CN119878809A (en) * | 2025-01-02 | 2025-04-25 | 潍柴动力股份有限公司 | Gear shifting control method, system, equipment and storage medium for gearbox |
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| CN114776801B (en) | 2024-03-22 |
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