CN109595336B - Torque pressure adjusting method for clutch of wet-type double-clutch automatic transmission - Google Patents
Torque pressure adjusting method for clutch of wet-type double-clutch automatic transmission Download PDFInfo
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- CN109595336B CN109595336B CN201811566722.8A CN201811566722A CN109595336B CN 109595336 B CN109595336 B CN 109595336B CN 201811566722 A CN201811566722 A CN 201811566722A CN 109595336 B CN109595336 B CN 109595336B
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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
- F16H61/02—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 characterised by the signals used
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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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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
Abstract
The invention discloses a method for adjusting the torque pressure of a clutch of a wet-type double-clutch automatic transmission, which comprises the following steps: of clutchesThe torque range is divided into N sections of torque areas; obtaining actual engine torque TactAnd actual clutch pressure Pact(ii) a Actual engine torque T when within a certain torque rangeactWhen the number of the sampling points is larger than or equal to the upper limit a of the sampling points, calculating the actual engine torque TactAverage value of (A) TavgAnd corresponding actual clutch pressure PactAverage value P ofavg(ii) a When the number of torque areas reaching the upper limit a of the sampling point is larger than or equal to the threshold value g of the torque areas, calculating the gradient k of the torque and pressure relation curve of each adjacent torque area, and obtaining the average gradient kavg(ii) a According to the average slope kavgCalculating the transmission torque Tfin＝kavg*(Pfin-Z). The method for adjusting the clutch torque pressure of the wet double-clutch automatic transmission adjusts the torque transmitted by the clutch by correcting the slope of the curve of the pressure and the transmission torque, thereby effectively avoiding the abnormal transmission of the engine torque.
Description
Technical Field
The invention relates to the field of double-clutch automatic transmissions, in particular to a method for adjusting clutch torque pressure of a wet double-clutch automatic transmission.
Background
A typical wet dual clutch automatic transmission consists of two clutches nested coaxially or arranged in parallel, two input shafts nested coaxially and inside and outside, two output shafts arranged in parallel, a plurality of synchronizer devices arranged on the output shafts, a plurality of shift forks and 1 differential. The odd and even gears of the transmission are respectively arranged on two input shafts, and through the switching of two clutches and the action of different synchronizers, the torque conversion and the output are realized through different output shafts, and the transmission power flow is as follows: engine output torque → dual clutch → transmission input shaft → transmission output shaft → wheels. The dual clutches are engaged or disengaged according to control commands throughout the transmission of the power flow.
The main function of the dual clutch of a wet dual clutch automatic transmission is to transmit engine torque. The purpose of transmitting torques of different sizes is realized by applying pressures of different sizes to the friction plates of the clutch. Generally, the pressure applied to the friction plates of the dual clutch and the transmitted torque exhibit a linear relationship, which depends mainly on the friction coefficient of the friction plates. As the friction plate of the clutch wears, the friction coefficient changes, resulting in abnormal transmission of engine torque.
Therefore, how to provide a method for adjusting the clutch torque pressure of the wet-type dual-clutch automatic transmission, which can effectively avoid the abnormal transmission of the engine torque, is a technical problem to be solved in the field.
Disclosure of Invention
The invention aims to provide a novel technical scheme of a clutch torque pressure adjusting method of a wet double-clutch automatic transmission, which can effectively avoid abnormal transmission of engine torque.
According to a first aspect of the present invention, a wet dual clutch automatic transmission clutch torque pressure adjustment method is provided.
The method for adjusting the clutch torque pressure of the wet double-clutch automatic transmission comprises the following steps:
s1: dividing the torque range of the clutch into N sections of torque areas;
s2: obtaining actual engine torque TactAnd actual clutch pressure PactAnd the actual engine torque T is comparedactClassifying according to the torque area;
s3: actual engine torque T when within a certain torque rangeactWhen the number of the sampling points is larger than or equal to the upper limit a of the sampling points, calculating a actual engine torques T in the torque areaactAverage value of (A) TavgAnd corresponding actual clutch pressure PactAverage value P ofavg；
S4: when the number of torque areas reaching the upper limit a of the sampling points is greater than or equal to the threshold value g of the torque areas, countingCalculating the slope k of the torque and pressure relation curve of each adjacent torque area in the torque area reaching the upper limit a of the sampling point, and obtaining the average slope kavg；
S5: according to the average slope kavgCalculating the transmission torque Tfin＝kavg*(Pfin-Z), wherein PfinIs clutch pressure, Z is clutch engagement point pressure, and PfinIs greater than Z.
Optionally, the torque zones in step S1 are equal steps.
Optionally, the upper limit a of the sampling point is 100.
Alternatively, the torque zone threshold g is 5.
Optionally, before the step S1, the method further includes:
step S01: and judging whether the oil temperature in the transmission of the wet double-clutch automatic transmission reaches an oil temperature threshold value, whether the difference value of the rotating speed of the driven plate of the clutch and the rotating speed of the driving plate reaches a micro-friction rotating speed range and whether the duration time of the difference value of the rotating speed of the driven plate of the clutch and the rotating speed of the driving plate in the micro-friction range reaches micro-friction time, if so, executing the step S1.
Optionally, the oil temperature threshold is 60-100 ℃, the micro-sliding friction rotating speed range is 10-50 rpm, and the micro-sliding friction time is 1000 ms.
Optionally, after the step S5, the method further includes:
s6: determining the transfer torque Tfin＝kavg*(Pfin-Z) is within the torque threshold range of the clutch and, if so, is to transmit torque Tfin＝kavg*(Pfin-Z) adjusting the clutch.
Optionally, after the step S5, the method further includes:
s6: determining the transfer torque Tfin＝kavg*(Pfin-Z) is within the torque threshold range of the clutch, if yes, step S7 is executed;
s7: to transmit torque TfinAnd D times of the difference value of the original transmission torque is used for adjusting the clutch, wherein D is more than or equal to 0 and less than 1.
Optionally, D in step S7 is 0.5.
Optionally, after the step S7, the method further includes:
s8: clearing the actual engine torque T in the torque region up to the upper limit a of the sampling pointactAnd actual clutch pressure PactThe steps S2-S7 are executed in a loop.
The method for adjusting the clutch torque pressure of the wet double-clutch automatic transmission adjusts the torque transmitted by the clutch by correcting the slope of the curve of the pressure and the transmission torque, thereby effectively avoiding the abnormal transmission of the engine torque.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a flowchart of an embodiment of a method of adjusting clutch torque pressure of a wet dual clutch automatic transmission according to the present disclosure.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
As shown in fig. 1, the wet dual clutch automatic transmission clutch torque pressure adjusting method of the present disclosure includes the steps of:
step S1: the torque range of the clutch is divided into N sections of torque regions. In specific implementation, each torque zone in step S1 has equal step size.
For example: the maximum transmission torque of a certain wet double clutch automatic transmission is 300Nm, and the transmission torque can be divided into 10 torque regions at intervals of 30 Nm.
Generally, the more divided torque regions, the more accurate the adjustment result will be, but the adjustment time will increase. In addition, when the torque area is divided, a partial torque range can be divided, for example, 100Nm to 200Nm is divided into 5 areas, so that the adjustment time is shortened, and meanwhile, the torque instability and large errors of a low-torque area section and a high-torque area section can be avoided, and the error of the adjustment result is caused.
Step S2: obtaining actual engine torque TactAnd actual clutch pressure PactAnd the actual engine torque T is comparedactThe classification is made according to the torque region. When the actual engine torque T is obtainedactAnd when the torque of a certain section is within a certain torque area, adding 1 to the number of sampling points of the torque area.
Step S3: actual engine torque T when within a certain torque rangeactWhen the number of the sampling points is larger than or equal to the upper limit a of the sampling points, calculating a actual engine torques T in the torque areaactAverage value of (A) TavgAnd corresponding actual clutch pressure PactAverage value P ofavg。
The upper limit a of the sampling point can be flexibly set according to actual requirements. For example, the upper limit a of the sampling point is 100. When the number of sampling points in a certain torque area exceeds the upper limit a, the average value T can be updated in an iterative modeavgAnd Pavg(ii) a Alternatively, (a-1) T may be takenavgWith the latest actual engine torque TactDividing the sum by the upper limit a of the sampling point to obtain a new average value TavgAnd taking (a-1) PactWith the latest actual clutch pressure PactDividing the sum by the upper limit a of the sampling point as a new average value Pact。
Step S4: when the number of torque areas reaching the upper limit a of the sampling point is larger than or equal to the threshold value g of the torque areas, calculating the gradient k of the torque and pressure relation curve of each adjacent torque area in the torque areas reaching the upper limit a of the sampling point, and acquiring the average gradient kavg. The torque area threshold value g can be flexibly set according to actual requirements. For example, the torque zone threshold g is 5.
When the number of torque areas reaching the upper limit a of the sampling point is greater than or equal to the threshold value g of the torque areas, g-1 slopes k can be calculated, so that the average slope k is obtainedavg。
Step S5: according to the average slope kavgCalculating the transmission torque Tfin＝kavg*(Pfin-Z)。PfinIs clutch pressure, Z is clutch engagement point pressure, and PfinIs greater than Z. When the clutch pressure is above the clutch mesh point Z, the clutch pressure is directly proportional to the torque transmitted by the clutch, while the torque transmitted by the clutch mesh point is 0 Nm.
In an embodiment of the method for adjusting the clutch torque pressure of the wet dual clutch automatic transmission of the present disclosure, in order to improve the adjustment accuracy, step S1 is preceded by:
step S01: and judging whether the oil temperature in the transmission of the wet double-clutch automatic transmission reaches an oil temperature threshold value, whether the difference value of the rotating speed of the driven plate of the clutch and the rotating speed of the driving plate reaches a micro-friction rotating speed range and whether the duration time of the difference value of the rotating speed of the driven plate of the clutch and the rotating speed of the driving plate in the micro-friction range reaches micro-friction time, if so, executing the step S1.
Further, the oil temperature threshold value is 60-100 ℃, the micro-sliding friction rotating speed range is 10-50 rpm, and the micro-sliding friction time is 1000 ms.
In an embodiment of the method for adjusting the clutch torque pressure of the wet dual clutch automatic transmission according to the present disclosure, in order to improve the adjustment accuracy, the method further includes, after step S5:
step S6: determining the transfer torque Tfin＝kavg*(Pfin-Z) is within a torque threshold range of the clutch. The torque threshold range for the clutch is determined by the clutch hardware characteristics. If so, to transmit torque Tfin＝kavg*(Pfin-Z) adjusting the clutch. If not, steps S1-S5 need to be re-executed.
In an embodiment of the method for adjusting the clutch torque pressure of the wet dual clutch automatic transmission according to the present disclosure, in order to improve the adjustment accuracy, the method further includes, after step S5:
step S6: determining the transfer torque Tfin＝kavg*(Pfin-Z) is within a torque threshold range of the clutch. The torque threshold range for the clutch is determined by the clutch hardware characteristics. If so, to transmit torque Tfin＝kavg*(Pfin-Z) adjusting the clutch. If not, steps S1-S5 need to be re-executed.
Step S7: to transmit torque TfinAnd D times of the difference value of the original transmission torque is used for adjusting the clutch, wherein D is more than or equal to 0 and less than 1. Thus, the change of the transmission torque can be effectively avoided to be overlarge, and the running stability is improved. The raw transmission torque refers to the transmission torque of the clutch calculated from the torque and pressure curves of the clutch before adjustment.
Further, D in step S7 is 0.5.
In an embodiment of the method for adjusting the clutch torque pressure of the wet dual clutch automatic transmission according to the present disclosure, in order to improve the adjustment accuracy, the method further includes, after step S7:
step S8: clearing the actual engine torque T in the torque region up to the upper limit a of the sampling pointactAnd actual clutch pressure PactThe steps S2-S7 are executed in a loop.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. A method for adjusting the clutch torque pressure of a wet double-clutch automatic transmission is characterized by comprising the following steps:
s1: dividing the torque range of the clutch into N sections of torque areas;
s2: obtaining actual engine torque TactAnd actual clutch pressure PactAnd the actual engine torque T is comparedactClassifying according to the torque area;
s3: actual engine torque T when within a certain torque rangeactWhen the number of the sampling points is larger than or equal to the upper limit a of the sampling points, calculating a actual engine torques T in the torque areaactAverage value of (A) TavgAnd corresponding actual clutch pressure PactAverage value P ofavg；
S4: when the number of torque areas reaching the upper limit a of the sampling point is larger than or equal to a torque area threshold value g, calculating the slope k of the engine torque and pressure relation curve of each adjacent torque area in the torque areas reaching the upper limit a of the sampling point, and acquiring the average slope kavg；
S5: according to the average slope kavgCalculating the transmission torque Tfin＝kavg*(Pfin-Z), wherein PfinIs clutch pressure, Z is clutch engagement point pressure, and PfinIs greater than Z.
2. The wet dual clutch automatic transmission clutch torque pressure adjusting method as claimed in claim 1, wherein the respective torque zones in the step S1 are in equal steps.
3. The wet dual clutch automatic transmission clutch torque pressure adjusting method as claimed in claim 1, wherein a sampling point upper limit a is 100.
4. The wet dual clutch automatic transmission clutch torque pressure adjustment method as claimed in claim 1, wherein the torque zone threshold g is 5.
5. The wet dual clutch automatic transmission clutch torque pressure adjusting method as claimed in any one of claims 1 to 4, further comprising before said step S1:
step S01: and judging whether the oil temperature in the transmission of the wet double-clutch automatic transmission reaches an oil temperature threshold value, whether the difference value of the rotating speed of the driven plate of the clutch and the rotating speed of the driving plate reaches a micro-friction rotating speed range and whether the duration time of the difference value of the rotating speed of the driven plate of the clutch and the rotating speed of the driving plate in the micro-friction range reaches micro-friction time, if so, executing the step S1.
6. The method as claimed in claim 5, wherein the oil temperature threshold is 60-100 ℃, the micro-slip rotation speed range is 10-50 rpm, and the micro-slip time is 1000 ms.
7. The wet dual clutch automatic transmission clutch torque pressure adjusting method as claimed in any one of claims 1 to 4, further comprising after the step S5:
s6: determining the transfer torque Tfin＝kavg*(Pfin-Z) is within the torque threshold range of the clutch and, if so, is to transmit torque Tfin＝kavg*(Pfin-Z) adjusting the clutch.
8. The wet dual clutch automatic transmission clutch torque pressure adjusting method as claimed in any one of claims 1 to 4, further comprising after the step S5:
s6: determining the transfer torque Tfin＝kavg*(Pfin-Z) is within the torque threshold range of the clutch, if yes, step S7 is executed;
s7: to transmit torque TfinAnd D times of the difference value of the original transmission torque is used for adjusting the clutch, wherein D is more than or equal to 0 and less than 1.
9. The wet dual clutch automatic transmission clutch torque pressure adjustment method as claimed in claim 8, wherein D in the step S7 is 0.5.
10. The wet dual clutch automatic transmission clutch torque pressure adjustment method as claimed in claim 8, further comprising after said step S7:
s8: clearing the actual engine torque T in the torque region up to the upper limit a of the sampling pointactAnd actual clutch pressure PactThe steps S2-S7 are executed in a loop.
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| CN110778620B (en) * | 2019-11-14 | 2020-08-21 | 安徽江淮汽车集团股份有限公司 | Clutch transmission torque calibration method, device, storage medium and device |
| CN112303226B (en) * | 2020-11-27 | 2022-04-19 | 重庆青山工业有限责任公司 | Pressure and torque curve correction method for wet-type double clutches |
| CN113586621B (en) * | 2021-06-10 | 2022-11-01 | 东风汽车集团股份有限公司 | Vehicle, gearbox and clutch torque control method and device |
| CN113586686B (en) * | 2021-08-31 | 2023-08-22 | 重庆长安汽车股份有限公司 | Self-adaptive adjustment method and device for clutch characteristic curve |
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| ATE348970T1 (en) * | 2002-03-07 | 2007-01-15 | Luk Lamellen & Kupplungsbau | DUAL CLUTCH TRANSMISSION AND METHOD FOR CONTROLLING AT LEAST TWO CLUTCHES IN A DUAL CLUTCH TRANSMISSION OF A VEHICLE |
| WO2014045357A1 (en) * | 2012-09-19 | 2014-03-27 | ヤマハ発動機株式会社 | Vehicle control device, vehicle, and engine |
| CN106555876B (en) * | 2015-09-29 | 2019-03-15 | 长城汽车股份有限公司 | The oil-filled control method of clutch in a kind of double-clutch speed changer |
| KR101806667B1 (en) * | 2016-02-15 | 2017-12-08 | 현대자동차주식회사 | Method for learning touch point of dual clutch transmission |
| CN106870718B (en) * | 2017-03-07 | 2018-07-20 | 安徽江淮汽车集团股份有限公司 | A kind of the upshift control method and system of wet dual-clutch automatic transmission |
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