CN109667926B - Low-speed pre-gear-shifting method of wet type double-clutch automatic transmission - Google Patents

Low-speed pre-gear-shifting method of wet type double-clutch automatic transmission Download PDF

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CN109667926B
CN109667926B CN201910061701.9A CN201910061701A CN109667926B CN 109667926 B CN109667926 B CN 109667926B CN 201910061701 A CN201910061701 A CN 201910061701A CN 109667926 B CN109667926 B CN 109667926B
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gear
executing
speed
judging whether
engaging
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CN109667926A (en
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向光军
黄辉
韩涌波
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Chongqing Changan Automobile Co Ltd
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Chongqing Changan Automobile Co Ltd
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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
    • F16H61/0202—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 the signals being electric
    • F16H61/0204—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 the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
    • 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
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/02—Selector apparatus
    • F16H59/0208—Selector apparatus with means for suppression of vibrations or reduction of noise
    • 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
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/36—Inputs being a function of speed
    • F16H59/46—Inputs being a function of speed dependent on a comparison between speeds
    • 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
    • F16H2061/0075—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 a particular control method

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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 low-speed pre-gear-shifting method of a wet type double-clutch automatic transmission, which comprises the following steps: calculating the position of the gear shift lever and judging if the gear shift lever is atExecuting a P gear pre-engagement strategy if the gear shift lever is in the R gear, executing an N gear pre-engagement strategy if the gear shift lever is in the N gear, and executing a D gear pre-engagement strategy if the gear shift lever is in the D gear; when the gear R is operated, if the gear R is operated, the vehicle speed V isRGreater than a set first speed threshold VR1Quitting 1 gear if the number of the quitting gear is less than a set frequency threshold b within a set time threshold T and the R gear speed VRIs less than a set second speed threshold VR2If the number of the gear backs in the T is more than or equal to b, the gear 1 is not engaged; in 1-gear operation, if 1-gear vehicle speed V1Greater than a third speed threshold VDAnd the R gear is in the gear, the R gear is withdrawn; the invention can solve the problem of knocking sound caused by pre-engaging the gear during low-speed running while ensuring the response time.

Description

Low-speed pre-gear-shifting method of wet type double-clutch automatic transmission
Technical Field
The invention belongs to the field of wet type double-clutch automatic transmissions, and particularly relates to a low-speed pre-gear-shifting method of a wet type double-clutch automatic transmission.
Background
Gear pre-engagement is a technique proposed to increase shift speed to reduce unnecessary shift-in and shift-out operations. The common shift logic is that the driver starts to engage when he wishes to shift and then the shift is completed, while pre-engagement is a technique to engage the driver in advance when he does not wish to shift but has the possibility of shifting. In the application process of the wet type double-clutch automatic transmission, when the 1-gear running (namely low-speed running) is carried out, in order to improve the response of reverse crawling and starting after the 1-gear brake is stopped, the reverse gear needs to be pre-engaged; if the 1 st gear and the reverse gear are always pre-engaged during low-speed driving, knocking sound caused by pre-engaged gears which do not transmit torque can occur when the 1 st gear and the reverse gear crawl or start, and thus, although the response problem is solved, great complaints of customers about abnormal sound can be caused.
Disclosure of Invention
The invention aims to provide a low-speed pre-gear-shifting method of a wet type double-clutch automatic transmission, which aims to solve the problem of knocking caused by low-speed running pre-gear-shifting while ensuring response time.
The invention discloses a low-speed pre-gear-shifting method of a wet type double-clutch automatic transmission, which comprises the following steps: and calculating the position of the gear shift lever and judging, executing a P-gear pre-engagement strategy if the gear shift lever is in a P gear, executing an R-gear pre-engagement strategy if the gear shift lever is in an R gear, executing an N-gear pre-engagement strategy if the gear shift lever is in an N gear, and executing a D-gear pre-engagement strategy if the gear shift lever is in a D gear.
Wherein the R-gear pre-engagement strategy is:
setting the number of gear-reversing times to be equal to 0, starting timing, judging whether the gear R is in the gear, if so, executing the second step, otherwise, engaging the gear R, and then executing the second step;
secondly, judging whether the timing time is greater than a set time threshold T, if so, ending, otherwise, executing a third step;
step three, judging whether the gear 1 is in the gear, if so, executing the step four, otherwise, executing the step five;
fourthly, judging the R gear speed VRWhether it is greater than a set first speed threshold VR1If yes, 1 gear is withdrawn, the number of times of gear withdrawal is increased by 1, then the second step is executed in a returning mode, otherwise, the second step is executed in a directly returning mode;
fifthly, judging whether the number of times of gear withdrawal is less than a set number threshold b and the R gear speed VRIs less than a set second speed threshold VR2And if so, engaging 1 gear and then returning to execute the second step, otherwise, directly returning to execute the second step.
Wherein the D gear pre-engagement strategy is:
the method comprises the steps of firstly, judging whether a gear 1 is in a gear, if so, executing a second step, otherwise, engaging the gear 1, and then executing the second step;
secondly, judging whether the speed V of the 1-gear vehicle is in a gear V1Greater than a third speed threshold VDAnd the R gear is in the gear, if so, the R gear is reversed, and then the process is ended, otherwise, the process is directly ended.
Wherein the P gear pre-engaging strategy is as follows: firstly, judging whether the 1 st gear is in the gear, if the 1 st gear is in the gear, keeping the 1 st gear in the gear state, and if the 1 st gear is not in the gear, engaging the 1 st gear; and then judging whether the R gear is in the gear, if the R gear is in the gear, backing the R gear, and if the R gear is not in the gear, keeping the R gear not in the gear state. And when the gear P is shifted, the response time of starting is ensured by pre-engaging the gear 1 and returning the gear R.
Wherein the N-gear pre-engaging strategy is as follows: and judging whether the 1 st gear is in the gear, if the 1 st gear is in the gear, keeping the 1 st gear in the gear state, and if the 1 st gear is not in the gear, engaging the 1 st gear. In the N gear, the response time of starting is also ensured by pre-engaging the 1 gear.
The invention has the following effects:
when the gear R is operated, if the gear R is operated, the vehicle speed V isRGreater than a set first speed threshold VR1Quitting 1 gear if the number of the quitting gear is less than a set frequency threshold b within a set time threshold T and the R gear speed VRIs less than a set second speed threshold VR2If the number of the gear steps is larger than or equal to the set number threshold value b within the set time threshold value T, the gear 1 is not engaged; in 1-gear operation, if 1-gear vehicle speed V1Greater than a third speed threshold VDAnd the R gear is in the gear, the R gear is withdrawn; the method reduces the number of the gear entering and the gear returning of the gear 1 and the gear R when the response time of the gear R and the gear 1 is ensured, and effectively solves the knocking problem of the wet type double-clutch automatic transmission during low-speed operation.
Drawings
FIG. 1 is a logic flow diagram of an embodiment.
FIG. 2 is a flowchart illustrating implementation of an R-range pre-engagement strategy according to an embodiment.
FIG. 3 is a flowchart illustrating implementation of a D-range pre-engagement strategy according to an embodiment.
FIG. 4 is a flowchart illustrating implementation of a P-range pre-engagement strategy according to an embodiment.
FIG. 5 is a flowchart illustrating implementation of an N-gear pre-engagement strategy according to an embodiment.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The low-speed pre-shift method of the wet dual clutch automatic transmission shown in fig. 1 to 5 is: and calculating the position of the gear shift lever and judging, executing a P-gear pre-engagement strategy if the gear shift lever is in a P gear, executing an R-gear pre-engagement strategy if the gear shift lever is in an R gear, executing an N-gear pre-engagement strategy if the gear shift lever is in an N gear, and executing a D-gear pre-engagement strategy if the gear shift lever is in a D gear.
As shown in fig. 2, the R range pre-engagement strategy is:
setting the number of gear-reversing times to be equal to 0, starting timing, judging whether the R gear is in the gear, if so, keeping the R gear in the gear state, and executing the second step, otherwise, engaging the R gear, and then executing the second step;
secondly, judging whether the timing time is greater than a set time threshold T, if so, ending, otherwise, executing a third step;
step three, judging whether the gear 1 is in the gear, if so, keeping the gear 1 in the gear state, and executing the step four, otherwise, executing the step five;
fourthly, judging the R gear speed VRWhether it is greater than a set first speed threshold VR1If yes, 1 gear is withdrawn, the number of times of gear withdrawal is increased by 1, then the second step is executed in a returning mode, otherwise, the second step is executed in a directly returning mode;
fifthly, judging whether the number of times of gear withdrawal is less than a set number threshold b and the R gear speed VRIs less than a set second speed threshold VR2If yes, the 1 gear is engaged, then the second step is executed, otherwise, the second step is directly executed; i.e. if the number of downshifts within the set time threshold T is greater than or equal to the set number threshold b, then no further gear 1 is engaged.
As shown in fig. 3, the D-range pre-engagement strategy is:
the method comprises the steps that firstly, whether the gear 1 is in a gear or not is judged, if yes, the gear 1 is kept in a gear state, and the second step is executed, otherwise, the gear 1 is engaged, and then the second step is executed;
secondly, judging whether the speed V of the 1-gear vehicle is in a gear V1Greater than a third speed threshold VDAnd the R gear is in the gear, if so, the R gear is reversed, and then the process is ended, otherwise, the process is directly ended.
Firstly, judging whether the 1 st gear is in the gear, if the 1 st gear is in the gear, keeping the 1 st gear in the gear state, and if the 1 st gear is not in the gear, engaging the 1 st gear; then at 1 st gear speed V1Greater than a third speed threshold VDIf the R gear is not in the gear, the R gear is kept in the gear-out stateState.
As shown in fig. 4, the P range pre-engagement strategy is:
the method comprises the steps that firstly, whether the gear 1 is in a gear or not is judged, if yes, the gear 1 is kept in a gear state, and the second step is executed, otherwise, the gear 1 is engaged, and then the second step is executed;
and secondly, judging whether the R gear is in the gear, if so, backing the R gear, and then finishing, otherwise, directly finishing.
Firstly, judging whether the 1 st gear is in the gear, if the 1 st gear is in the gear, keeping the 1 st gear in the gear state, and if the 1 st gear is not in the gear, engaging the 1 st gear; and then judging whether the R gear is in the gear, if the R gear is in the gear, backing the R gear, and if the R gear is not in the gear, keeping the R gear not in the gear state.
As shown in fig. 5, the N-gear pre-engagement strategy is: and judging whether the 1 st gear is in the gear, if so, keeping the 1 st gear in the gear state, and finishing, otherwise, engaging the 1 st gear, and finishing. That is, it is determined whether or not 1 st gear is in the first gear, and if 1 st gear is in the first gear, the 1 st gear is maintained, and if 1 st gear is not in the first gear, 1 st gear is engaged.

Claims (1)

1. A low-speed pre-gear method of a wet type double-clutch automatic transmission comprises the following steps: calculating the position of a gear shifting lever and judging, if the gear shifting lever is in a P gear, executing a P gear pre-engagement strategy, if the gear shifting lever is in an R gear, executing an R gear pre-engagement strategy, if the gear shifting lever is in an N gear, executing an N gear pre-engagement strategy, and if the gear shifting lever is in a D gear, executing a D gear pre-engagement strategy; the method is characterized in that:
the R gear pre-engaging strategy is as follows:
setting the number of gear-reversing times to be equal to 0, starting timing, judging whether the gear R is in the gear, if so, executing the second step, otherwise, engaging the gear R, and then executing the second step;
secondly, judging whether the timing time is greater than a set time threshold T, if so, ending, otherwise, executing a third step;
step three, judging whether the gear 1 is in the gear, if so, executing the step four, otherwise, executing the step five;
fourthly, judging the R gear speed VRWhether it is greater than a set first speed threshold VR1If yes, 1 gear is withdrawn, the number of times of gear withdrawal is increased by 1, then the second step is executed in a returning mode, otherwise, the second step is executed in a directly returning mode;
fifthly, judging whether the number of times of gear withdrawal is less than a set number threshold b and the R gear speed VRIs less than a set second speed threshold VR2If yes, the 1 gear is engaged, then the second step is executed, otherwise, the second step is directly executed;
the D gear pre-engaging strategy is as follows:
the method comprises the steps of firstly, judging whether a gear 1 is in a gear, if so, executing a second step, otherwise, engaging the gear 1, and then executing the second step;
secondly, judging whether the speed V of the 1-gear vehicle is in a gear V1Greater than a third speed threshold VDAnd the R gear is in the gear, if yes, the R gear is withdrawn, and then the process is ended, otherwise, the process is directly ended;
the P gear pre-engaging strategy is as follows: firstly, judging whether the 1 st gear is in the gear, if the 1 st gear is in the gear, keeping the 1 st gear in the gear state, and if the 1 st gear is not in the gear, engaging the 1 st gear; judging whether the R gear is in the gear, if the R gear is in the gear, backing the R gear, and if the R gear is not in the gear, keeping the R gear not in the gear state;
the N gear pre-engaging strategy is as follows: and judging whether the 1 st gear is in the gear, if the 1 st gear is in the gear, keeping the 1 st gear in the gear state, and if the 1 st gear is not in the gear, engaging the 1 st gear.
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JP6126473B2 (en) * 2013-06-26 2017-05-10 デルタ工業株式会社 Automatic transmission shift device
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