CN114776801B - Feedforward control method for clutch pressure in automatic transmission garage shifting - Google Patents
Feedforward control method for clutch pressure in automatic transmission garage shifting Download PDFInfo
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- CN114776801B CN114776801B CN202210406663.8A CN202210406663A CN114776801B CN 114776801 B CN114776801 B CN 114776801B CN 202210406663 A CN202210406663 A CN 202210406663A CN 114776801 B CN114776801 B CN 114776801B
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- automatic transmission
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- clutch
- garage
- shifting
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
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
- F16H61/04—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
-
- 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 transmission. The transmission hydraulic system pressure is between 8 and 10bar, the internal brake pressure of the automatic transmission is between 1.5 and 1.8bar, and the time is between 0.5 and 1 s; when the TCU recognizes that the gear signal changes, the pressure of a main oil way of the hydraulic system and the pressure of a brake in the automatic transmission are increased; the first stage of shifting a garage, namely controlling the prefill time and the kisspeoint point maintaining time of a shifting clutch in an automatic transmission; in the first half of the second stage of the garage shifting, the turbine speed change of the automatic transmission reaches 50% of the process of the second stage of the garage shifting, a target solenoid valve current is calculated as a target feedforward value, the solenoid valve current is transited to the target feedforward value within a calibratable time, and all the processes of the second stage of the garage shifting are completed; in the third stage of the garage shift, the internal shift clutch pressure of the automatic transmission is rapidly increased to complete the shift. The invention is used for feedforward control of clutch pressure in automatic transmission garage shifting.
Description
Technical Field
The invention belongs to the technical field of automatic transmissions, and particularly relates to a feedforward control method for clutch pressure in automatic transmission garage shifting.
Background
Currently, most of the shift pressure control in an AT transmission (automatic transmission) employs a combination of open loop slope control and closed loop PID control. However, such control methods may cause insufficient or excessive pressure during shifting when dealing with shifting at different engine torques.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide a feedforward control method for clutch pressure in automatic transmission garage shifting.
The invention provides a feedforward control method of clutch pressure in the process of shifting a garage of an automatic transmission, which is used for ensuring that the pressure in the process of shifting the garage under different engine torques is always at a proper level.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a method of feedforward control of clutch pressure in a garage shift of an automatic transmission, the method comprising the steps of:
step one: firstly, the pressure of a hydraulic system of the transmission is required to be kept between 8 and 10bar, the pressure of a brake in the automatic transmission is kept between 1.5 and 1.8bar, and the time is kept between 0.5 and 1 s;
step two: when the TCU recognizes that the gear signal changes, the pressure of a main oil way of the hydraulic system is rapidly increased by 1.5-2.5 times of the pressure of an internal brake of the automatic transmission on the basis of the original pressure;
step three: in the first stage of shifting, controlling the pre-filling time and the half clutch point maintaining time of the clutch in the automatic transmission in two stages, wherein the pre-filling time is 0.1s-0.15s, and the half clutch point maintaining time is 0.25s-0.3s;
step four: in the first half part of the second stage of the garage shifting, the solenoid valve current corresponding to the clutch in the automatic transmission is increased with a fixed slope until the turbine speed change of the automatic transmission reaches 50% of the process of the second stage of the garage shifting, then the target solenoid valve current under the current engine torque is calculated as a target feedforward value according to the basic characteristics of the clutch, the solenoid valve current is transited to the target feedforward value in the calibratable time, and simultaneously closed-loop PID regulation is matched until the turbine speed change of the transmission completes all the processes of the second stage of the garage shifting;
step five: in the third stage of the garage shift, the internal clutch pressure of the automatic transmission is rapidly increased to complete the shift.
Further, in the fourth step, the calculation method of the second stage process of the garage shifting comprises the following steps: shift progress= (current turbine speed-target turbine speed before shift)/(target turbine speed before shift-target turbine speed after shift).
Further, in the fourth step, the calculation method of the target feedforward value is as follows: target feed forward value = clutch torque versus pressure correspondence feature point + delta; wherein: delta represents a calibratable adjustment.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, a control strategy is designed for ensuring the smoothness and responsiveness of gear shifting in the process of shifting a garage of an automatic transmission through analyzing the characteristics of a hydraulic system, so that the pressure in the process of shifting the garage is controlled more accurately, and the gear shifting quality is improved.
2. The invention can effectively solve the problems of gear shift setbacks and impact caused by the change of conditions such as throttle, rotating speed and the like in the process of gear shift, can ensure that the clutch pressure always follows the change of torque and rotating speed through feedforward adjustment, ensures that the change of the turbine rotating speed is smooth in the whole gear shift process, has smooth gear shift feeling and ensures that the pressure is always at a proper level.
Drawings
FIG. 1 is a control chart of a garage shift process using a feed forward control method of clutch pressure in a garage shift of an automatic transmission according to the present invention.
In the figure: (1) representing a first phase of a gear shift; (2) representing a second phase of the shift; (3) representing a third phase of the shift; (4) a shift handle signal; (5) indicating that the gear shifting handle is shifted into a D or R gear from P or N; (6) representing a turbineA rotational speed signal; (7) representing the main oil pressure solenoid valve current; (8) representing an automatic transmission internal brake solenoid current; (9) representing the internal clutch solenoid current of the automatic transmission; and (c) represents an automatic transmission internal clutch pre-charge oil control;indicating that the internal clutch of the automatic transmission remains at a half-off point; />Indicating that the internal clutch of the automatic transmission is controlled by the open loop slope until the rotation speed of the turbine changes to 50% of the process;indicating that the current of a clutch electromagnetic valve in the automatic transmission transits to a target feedforward value in a specified time through feedforward control, and completing the whole process of rotating speed change under the combined action of closed-loop PID regulation; />Indicating that the internal clutch pressure of the automatic transmission at the third stage is rapidly increased to complete the gear shift.
Detailed Description
The first embodiment is as follows: as shown in fig. 1, the present embodiment describes a feedforward control method of clutch pressure in a garage shift of an automatic transmission, the method including the steps of:
step one: firstly, the pressure of a hydraulic system of the transmission is required to be kept between 8 and 10bar, the pressure of a brake in the automatic transmission is kept between 1.5 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 shift begins.
Step two: when the TCU (transmission control unit) recognizes the change of a gear signal, the pressure of a main oil way of a hydraulic system and the pressure of a brake in an automatic transmission are rapidly 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 oil line pressure is sufficient to support the completion of the shift during the shift.
Step three: in a first stage of shifting a garage (P\N-D\R, namely, shifting into a D or R gear from P or N), controlling the pre-filling time and the half-clutch point (half-clutch point) holding time of a clutch in the automatic transmission in two stages, wherein the pre-filling time is 0.1s-0.15s, and the half-clutch point (half-clutch point) holding time is 0.25s-0.3s; the function of this stage is to ensure that the first stage clutch of the shift is done with pressure build up and is in a semi-engaged state.
Step four: in the first half part of the second stage of the shift (P\N-D\R, i.e. shift from P or N to D or R gear), the solenoid valve current corresponding to the clutch in the automatic transmission is increased with a fixed slope (calibratable slope) until the turbine speed change of the automatic transmission reaches 50% of the process of the second stage of the shift, then the target solenoid valve current under the current engine torque is calculated as a target feedforward value according to the basic characteristics of the clutch, the solenoid valve current is transited to the target feedforward value in the calibratable time, and simultaneously closed loop PID (proportional integral derivative control) adjustment is matched until the turbine speed change of the transmission completes all the processes of the second stage of the shift; the function of this step is to ensure that the second stage of gear shifting is capable of effecting a change in the speed of the transmission turbine to form a D-speed or R-speed ratio.
The calculation method of the second stage process of the garage shifting comprises the following steps: shift progress= (current turbine speed-target turbine speed before shift)/(target turbine speed before shift-target turbine speed after shift).
The calculation method of the target feedforward value comprises the following steps: target feed forward value = clutch torque versus pressure correspondence feature point + delta; wherein: delta represents a calibratable adjustment.
Step five: in the third stage of shifting (P\N-D\R, i.e. shifting into a D or R gear from P or N), the clutch pressure in the automatic transmission is rapidly increased to complete the gear shifting; the function of this step is to ensure that the clutch can be fully compressed after the shift is completed, and no slipping phenomenon occurs.
The above embodiments are only illustrative of the present patent and do not limit the protection scope thereof, and those skilled in the art can also change the parts thereof, which are within the protection scope of the present patent without exceeding the spirit of the present patent.
Claims (3)
1. A feedforward control method of clutch pressure in automatic transmission garage shifting is characterized in that: the method comprises the following steps:
step one: firstly, the pressure of a hydraulic system of the transmission is required to be kept between 8 and 10bar, the pressure of a brake in the automatic transmission is kept between 1.5 and 1.8bar, and the time is kept between 0.5 and 1 s;
step two: when the TCU recognizes that the gear signal changes, the pressure of a main oil way of the hydraulic system is rapidly increased by 1.5-2.5 times of the pressure of an internal brake of the automatic transmission on the basis of the original pressure;
step three: in the first stage of shifting, controlling the pre-filling time and the half clutch point maintaining time of the clutch in the automatic transmission in two stages, wherein the pre-filling time is 0.1s-0.15s, and the half clutch point maintaining time is 0.25s-0.3s;
step four: in the first half part of the second stage of the garage shifting, the solenoid valve current corresponding to the clutch in the automatic transmission is increased with a fixed slope until the turbine speed change of the automatic transmission reaches 50% of the process of the second stage of the garage shifting, then the target solenoid valve current under the current engine torque is calculated as a target feedforward value according to the basic characteristics of the clutch, the solenoid valve current is transited to the target feedforward value in the calibratable time, and simultaneously closed-loop PID regulation is matched until the turbine speed change of the transmission completes all the processes of the second stage of the garage shifting;
step five: in the third stage of the garage shift, the internal clutch pressure of the automatic transmission is rapidly increased to complete the shift.
2. The feedforward control method of the clutch pressure in a garage shift of an automatic transmission according to claim 1, characterized by: in the fourth step, the calculation method of the second stage process of the garage shifting comprises the following steps: shift progress= (current turbine speed-target turbine speed before shift)/(target turbine speed before shift-target turbine speed after shift).
3. A feed forward control method of clutch pressure in automatic transmission garage shift according to claim 1 or 2, characterized by: in the fourth step, the calculation method of the target feedforward value is as follows: target feed forward value = clutch torque versus pressure correspondence feature point + delta; wherein: delta represents a calibratable adjustment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN114776801A CN114776801A (en) | 2022-07-22 |
| CN114776801B true CN114776801B (en) | 2024-03-22 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117006241B (en) * | 2023-09-19 | 2024-08-23 | 哈尔滨东安汽车发动机制造有限公司 | PID control method for clutch pressure in automatic transmission power downshifting process |
| 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 |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07113462A (en) * | 1993-10-15 | 1995-05-02 | Mitsubishi Motors Corp | Speed change controller for automatic transmission |
| US6155949A (en) * | 1999-06-14 | 2000-12-05 | General Motors Corporation | Multiple gain trim valve for a selectively engageable friction device |
| CN103671898A (en) * | 2013-12-25 | 2014-03-26 | 盛瑞传动股份有限公司 | Gear-shifting control method for automatic hydraulic speed changer |
| CN103758994A (en) * | 2014-02-20 | 2014-04-30 | 盛瑞传动股份有限公司 | Automatic gearbox self-adaption optimization gear-shifting control method |
| CN104315138A (en) * | 2014-08-27 | 2015-01-28 | 安徽江淮汽车股份有限公司 | Control method for shifting actuator of double-clutch automatic transmission |
| CN105257822A (en) * | 2015-10-13 | 2016-01-20 | 哈尔滨东安汽车发动机制造有限公司 | RN and DN gear shifting control strategy for automatic transmission |
| CN105757142A (en) * | 2013-08-26 | 2016-07-13 | 浙江吉利汽车研究院有限公司 | Control method and apparatus for clutch engagement of automotive automatic transmission |
| CN106402376A (en) * | 2016-10-10 | 2017-02-15 | 联合汽车电子有限公司 | Pressure control method of main oil way of automatic transmission |
| CN107504171A (en) * | 2017-09-22 | 2017-12-22 | 中国第汽车股份有限公司 | The half hitch chalaza determination methods and system of a kind of hydraulic automatic speed variator clutch |
| CN107859737A (en) * | 2017-09-29 | 2018-03-30 | 山东临工工程机械有限公司 | A kind of automatically controlled gear shift system of feedforward control |
| CN109058451A (en) * | 2018-09-07 | 2018-12-21 | 天津福云天翼科技有限公司 | A kind of automobile automatic shifting control method |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4826638B2 (en) * | 2009-02-13 | 2011-11-30 | トヨタ自動車株式会社 | Control device for automatic transmission for vehicle |
-
2022
- 2022-04-18 CN CN202210406663.8A patent/CN114776801B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07113462A (en) * | 1993-10-15 | 1995-05-02 | Mitsubishi Motors Corp | Speed change controller for automatic transmission |
| US6155949A (en) * | 1999-06-14 | 2000-12-05 | General Motors Corporation | Multiple gain trim valve for a selectively engageable friction device |
| CN105757142A (en) * | 2013-08-26 | 2016-07-13 | 浙江吉利汽车研究院有限公司 | Control method and apparatus for clutch engagement of automotive automatic transmission |
| CN103671898A (en) * | 2013-12-25 | 2014-03-26 | 盛瑞传动股份有限公司 | Gear-shifting control method for automatic hydraulic speed changer |
| CN103758994A (en) * | 2014-02-20 | 2014-04-30 | 盛瑞传动股份有限公司 | Automatic gearbox self-adaption optimization gear-shifting control method |
| CN104315138A (en) * | 2014-08-27 | 2015-01-28 | 安徽江淮汽车股份有限公司 | Control method for shifting actuator of double-clutch automatic transmission |
| CN105257822A (en) * | 2015-10-13 | 2016-01-20 | 哈尔滨东安汽车发动机制造有限公司 | RN and DN gear shifting control strategy for automatic transmission |
| CN106402376A (en) * | 2016-10-10 | 2017-02-15 | 联合汽车电子有限公司 | Pressure control method of main oil way of automatic transmission |
| CN107504171A (en) * | 2017-09-22 | 2017-12-22 | 中国第汽车股份有限公司 | The half hitch chalaza determination methods and system of a kind of hydraulic automatic speed variator clutch |
| CN107859737A (en) * | 2017-09-29 | 2018-03-30 | 山东临工工程机械有限公司 | A kind of automatically controlled gear shift system of feedforward control |
| CN109058451A (en) * | 2018-09-07 | 2018-12-21 | 天津福云天翼科技有限公司 | A kind of automobile automatic shifting control method |
| 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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| CN114776801A (en) | 2022-07-22 |
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