阅读说明：本技术 一种双离合变速器离合器半结合点压力自适应方法及系统 (Self-adaptive method and system for pressure of half-joint point of clutch of double-clutch transmission ) 是由 武晓俊 熊杰 李晓波 邓云飞 石兴磊 刘学武 于 2020-05-19 设计创作，主要内容包括：本发明提供一种双离合变速器离合器半结合点压力自适应方法及系统,该方法包括当判断双离合变速器的目标离合器满足离合器半结合点压力自适应条件,则控制目标离合器充油和目标同步器充油；控制目标同步器的压力以预设斜率增加,获取目标同步器的换挡压力；根据目标同步器的换挡压力、目标同步器的摩擦锥面数量、目标同步器的摩擦半径和目标同步器的锥角,计算目标同步器的同步力矩和目标离合器半结合点传递扭矩；根据目标离合器半结合点传递扭矩与目标离合器半结合点传递扭矩范围的关系,自适应更新目标离合器半结合点压力值。通过本发明,解决了现有双离合变速器磨损导致离合器半结合点变化,影响车辆控制问题。(The invention provides a clutch half-joint pressure self-adaptive method and a clutch half-joint pressure self-adaptive system of a double-clutch transmission, wherein the method comprises the steps of controlling the oil charge of a target clutch and the oil charge of a target synchronizer when judging that the target clutch of the double-clutch transmission meets the clutch half-joint pressure self-adaptive condition; controlling the pressure of the target synchronizer to increase by a preset slope, and acquiring the gear shifting pressure of the target synchronizer; calculating the synchronous torque of the target synchronizer and the semi-joint point transmission torque of the target clutch according to the gear shifting pressure of the target synchronizer, the number of friction conical surfaces of the target synchronizer, the friction radius of the target synchronizer and the cone angle of the target synchronizer; and self-adaptively updating the pressure value of the target clutch half-joint point according to the relation between the target clutch half-joint point transmission torque and the target clutch half-joint point transmission torque range. The invention solves the problem that the control of a vehicle is influenced by the change of the half-joint point of the clutch caused by the abrasion of the existing double-clutch transmission.)

1. A dual clutch transmission clutch half-nip pressure adaptation method, comprising:

step S11, when the target clutch of the double-clutch transmission is judged to meet the clutch half-joint pressure self-adaptive condition, controlling the target clutch to fill oil and keeping the clutch half-joint pressure value of the target clutch at the clutch half-joint pressure value of the previous moment of the target clutch;

step S12, controlling the oil filling of a target synchronizer corresponding to the target clutch to enable the target synchronizer to move a shifting fork at a preset pressure value, and finishing the oil filling of the target synchronizer when the position displacement of the target synchronizer is larger than or equal to a preset third threshold value;

step S13, controlling the target synchronizer to increase pressure by a preset slope, and acquiring the gear shifting pressure of the target synchronizer when the difference value between the rotating speed of the target clutch and the input rotating speed of the dual-clutch transmission meets a preset condition;

step S14, calculating the target clutch half-joint point transmission torque according to the shift pressure of the target synchronizer;

and step S15, updating the target clutch half-joint point pressure value according to the relation between the target clutch half-joint point transmission torque and the target clutch half-joint point transmission torque range.

2. The method of claim 1, wherein determining that a target clutch of the dual clutch transmission satisfies a clutch half-nip pressure adaptive condition specifically comprises:

judging whether the double-clutch transmission has no faults of a temperature sensor, a pressure sensor and an electromagnetic valve, judging whether the oil temperature of the double-clutch transmission is greater than a self-adaptive lowest temperature threshold value, judging whether the double-clutch transmission is currently in a steady-state gear and a shaft of a target clutch is an uncontrolled shaft, judging whether all shifting forks on the shaft of the target clutch are in a neutral position, judging whether the input torque of the double-clutch transmission is a positive value and greater than a lowest torque threshold value, and judging whether the current steady-state gear is not subjected to over-half joint point self-adaptation;

when the double-clutch transmission is in a fault without a temperature sensor, a pressure sensor and an electromagnetic valve, when the oil temperature of the double-clutch transmission is larger than a preset self-adaptive minimum temperature threshold value, when the double-clutch transmission is currently in a steady-state gear and a shaft where a target clutch is located is an uncontrolled shaft, and when all shifting forks on the shaft where the target clutch is located are in a neutral position, and when the input torque of the double-clutch transmission is a positive value and is larger than the preset minimum torque threshold value and the current steady-state gear is not subjected to excessive clutch connection point self-adaptation and is simultaneously established, the target clutch is judged to meet a clutch connection point pressure self-adaptation condition, otherwise, the target clutch is judged to not meet the clutch connection point pressure self-adaptation condition.

3. The method of claim 1, wherein the step of controlling the target clutch fill and maintaining the target clutch at a clutch half-engagement point pressure value at a previous time half-engagement point pressure value of the target clutch comprises:

controlling the target clutch to fill oil and keeping the pressure value of the half-joint point of the clutch of the target clutch as the pressure value of the half-joint point of the clutch at the previous moment of the target clutch, and finishing the oil filling of the target clutch when the absolute value of the difference between the actual pressure value of the clutch of the target clutch and the pressure value of the half-joint point of the clutch of the target clutch is smaller than or equal to a preset first threshold value and the absolute value of the difference between the rotating speed of the target clutch and the input rotating speed of the automatic transmission is smaller than or equal to a preset second threshold value.

4. The method according to claim 1, wherein step S13 specifically includes:

s131, controlling the target synchronizer to increase pressure by a preset slope, acquiring a first rotation speed difference value at the initial time of pressure increase of the target synchronizer, and continuously acquiring a second rotation speed difference value, wherein when the absolute value of the difference value between the second rotation speed difference value and the first rotation speed difference value is greater than or equal to a preset fourth threshold value, the pressure of the target synchronizer stops increasing, the first rotation speed difference value is the absolute value of the difference value between the rotation speed of the target clutch and the input rotation speed of the dual-clutch transmission at the initial time of pressure increase of the target synchronizer, and the second rotation speed difference value is the absolute value of the difference value between the rotation speed of the target clutch and the input rotation speed of the dual-clutch transmission after the initial time;

and S132, controlling the target synchronizer to maintain a last-moment pressure value, and when the last-moment pressure maintaining time is longer than a preset time threshold, acquiring the last-moment pressure value as the shifting pressure of the target synchronizer.

5. The method according to claim 1, wherein step S14 specifically includes:

s141, calculating the synchronizing torque of the target synchronizer according to the shifting pressure of the target synchronizer, the number of friction conical surfaces of the target synchronizer, the friction radius of the target synchronizer and the cone angle of the target synchronizer;

and S142, calculating the half-joint-point transmission torque of the target clutch according to the transmission ratio from the driven end of the target clutch to the driving end of the target synchronizer and the fact that the torque transmitted to the target clutch end by the synchronous torque of the target synchronizer is equal to the half-joint-point transmission torque of the target clutch.

6. The method according to claim 1, wherein step S15 specifically includes:

comparing the target clutch half-engagement point transfer torque to the target clutch half-engagement point transfer torque range;

when the target clutch half-joint point transmission torque is larger than a lower limit threshold value of a preset target clutch half-joint point transmission torque and is smaller than an upper limit threshold value of the preset target clutch half-joint point transmission torque, adaptively updating the target clutch half-joint point pressure value to be a target clutch half-joint point pressure value before updating;

when the target clutch half-joint point transmission torque is larger than or equal to the upper limit threshold of the preset target clutch half-joint point transmission torque, adaptively updating the target clutch half-joint point pressure value to be equal to the difference value of the target clutch half-joint point pressure value before updating and a first adjustment step length of the clutch half-joint point pressure;

when the absolute value of the difference value of the target clutch half-joint point transmission torque and the upper limit threshold value of the preset target clutch half-joint point transmission torque is larger than the maximum value of the difference value of the preset target clutch half-joint point, the first adjustment step length of the clutch half-joint point pressure is the maximum value of the adjustment step length of the preset clutch half-joint point pressure;

when the absolute value of the difference between the target clutch half-engagement point transmission torque and the preset target clutch half-engagement point transmission torque upper limit threshold is greater than or equal to 0 and less than or equal to the preset target clutch half-engagement point difference threshold,

the first adjustment step length of the pressure of the half-joint point of the clutch is as follows: multiplying the maximum value of the preset clutch half-joint point pressure adjustment step length by the absolute value of the difference value of the target clutch half-joint point transmission torque and the upper limit threshold value of the preset target clutch half-joint point transmission torque, and then dividing the absolute value by the maximum value of the preset target clutch half-joint point difference value;

when the target clutch half-joint point transmission torque is smaller than or equal to the lower limit threshold of the preset target clutch half-joint point transmission torque, adaptively updating the target clutch half-joint point pressure value to be equal to the sum of the target clutch half-joint point pressure value before updating and a second adjustment step length of the clutch half-joint point pressure;

when the absolute value of the difference value of the lower limit threshold value of the target clutch half-joint point transmission torque and the preset target clutch half-joint point transmission torque is larger than the maximum value of the difference value of the preset target clutch half-joint point, the clutch half-joint point pressure adjusting step length is the maximum value of the preset clutch half-joint point pressure adjusting step length;

when the absolute value of the difference value of the lower limit threshold value of the target clutch half-joint point transmission torque and the preset target clutch half-joint point transmission torque is greater than or equal to 0 and is less than or equal to the preset target clutch half-joint point difference maximum value, the second adjustment step length of the clutch half-joint point pressure is as follows: and multiplying the maximum value of the preset clutch half-joint point pressure adjusting step length by the absolute value of the difference value of the target clutch half-joint point transmission torque and the lower limit threshold value of the preset target clutch half-joint point transmission torque, and then dividing the absolute value by the maximum value of the preset target clutch half-joint point difference value.

7. A dual clutch transmission clutch half-nip pressure adaptive system, the system comprising:

the judging unit is used for judging whether a target clutch of the wet type double-clutch and double-clutch transmission meets a clutch half-joint pressure self-adaptive condition or not;

the first control unit is used for controlling the target clutch to charge oil and keeping the pressure value of the clutch half-joint point of the target clutch at the previous moment of the target clutch if the target clutch of the wet type double-clutch transmission meets the self-adaptive condition of the pressure of the clutch half-joint point;

the second control unit is used for controlling oil filling of a target synchronizer corresponding to the target clutch, so that the target synchronizer moves a shifting fork at a preset pressure value, and when the position displacement of the target synchronizer is larger than or equal to a preset third threshold value, the oil filling of the target synchronizer is finished;

the third control unit is used for controlling the pressure of the target synchronizer to increase by a preset slope, and acquiring the shifting pressure of the target synchronizer when the difference value of the rotating speed of the target clutch and the input rotating speed of the dual-clutch transmission meets a preset condition;

a first calculation unit configured to calculate the target clutch half-engagement point transmission torque according to a shift pressure of the target synchronizer;

and the adjusting unit is used for updating the pressure value of the half-joint point of the target clutch according to the relation between the transmission torque of the half-joint point of the target clutch and the transmission torque range of the half-joint point of the target clutch.

8. The system of claim 7, wherein the determining unit comprises:

the first judgment module is used for judging whether the double-clutch transmission has no faults of a temperature sensor, a pressure sensor and an electromagnetic valve;

the second judgment module is used for judging whether the oil temperature of the dual-clutch transmission is greater than a self-adaptive minimum temperature threshold value or not;

the third judgment module is used for judging whether the double-clutch transmission is in a steady-state gear currently or not and whether a shaft where a target clutch is located is an uncontrolled shaft;

the fourth judging module is used for judging whether all shifting forks on the shaft of the target clutch are in neutral positions or not;

the fifth judgment module is used for judging whether the input torque of the dual-clutch transmission is a positive value and is greater than the lowest torque threshold value;

the sixth judgment module is used for judging whether the semi-joint self-adaption is not carried out on the current steady-state gear;

and the judging module is used for judging that the target clutch meets the clutch half-joint pressure adaptive condition when the double-clutch transmission is not provided with the faults of the temperature sensor, the pressure sensor and the electromagnetic valve and the oil temperature of the double-clutch transmission is greater than a preset adaptive minimum temperature threshold value, when the double-clutch transmission is currently in a steady-state gear, the shaft of the target clutch is an uncontrolled shaft, and when all shifting forks on the shaft of the target clutch are in a neutral position, when the input torque of the double-clutch transmission is a positive value and is greater than a preset minimum torque threshold value and the current steady-state gear is not subjected to half-joint self-adaptation and is simultaneously established, otherwise, judging that the target clutch does not meet the clutch half-joint pressure adaptive condition.

9. The system of claim 7, wherein the first control unit is specifically configured to:

controlling the target clutch to fill oil and keeping the pressure value of the half-joint point of the clutch of the target clutch as the pressure value of the half-joint point of the clutch at the previous moment of the target clutch, and finishing the oil filling of the target clutch when the absolute value of the difference between the actual pressure value of the clutch of the target clutch and the pressure value of the half-joint point of the clutch of the target clutch is smaller than or equal to a preset first threshold value and the absolute value of the difference between the rotating speed of the target clutch and the input rotating speed of the automatic transmission is smaller than or equal to a preset second threshold value.

10. The system of claim 7, wherein said third control unit comprises:

the first control module is used for controlling the pressure of the target synchronizer to increase by a preset slope, acquiring a first rotation speed difference value at the initial time of the pressure increase of the target synchronizer, and continuously acquiring a second rotation speed difference value, wherein when the absolute value of the difference between the second rotation speed difference value and the first rotation speed difference value is larger than or equal to a preset fourth threshold value, the pressure of the target synchronizer stops increasing, the first rotation speed difference value is the absolute value of the difference between the rotation speed of the target clutch and the input rotation speed of the dual-clutch transmission at the initial time of the pressure increase of the target synchronizer, and the second rotation speed difference value is the absolute value of the difference between the rotation speed of the target clutch and the input rotation speed of the dual-clutch transmission after the initial time;

and the second control module is used for controlling the target synchronizer to maintain a last-moment pressure value, and acquiring the last-moment pressure value as the shifting pressure of the target synchronizer when the last-moment pressure maintaining time is longer than a preset time threshold.

Technical Field

The invention relates to the technical field of automobile control, in particular to a self-adaptive method and a self-adaptive system for pressure of a half joint point of a clutch of a double-clutch transmission.

Background

The clutch half-joint point of the wet type double-clutch transmission plays an important role in starting, crawling and gear lifting control, and directly influences the accuracy of the control, but the change of the clutch half-joint point can be caused along with the use process of the double-clutch transmission, the aging of a hydraulic system and the abrasion of a friction plate or a hydraulic cylinder of the transmission, so that the starting, crawling and gear lifting control is influenced.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a self-adaptive method and a self-adaptive system for the pressure of a clutch half-joint point of a dual-clutch transmission, which are used for solving the problems that the change of the clutch half-joint point can be caused along with the use process of the dual-clutch transmission, the aging of a hydraulic system and the abrasion of a friction plate or a hydraulic cylinder of the transmission, so that the starting, the crawling and the control of a lifting gear are influenced.

The invention provides a self-adaptive method for the pressure of a half joint point of a clutch of a double-clutch transmission, which comprises the following steps:

step S11, when the target clutch of the double-clutch transmission is judged to meet the clutch half-joint pressure self-adaptive condition, controlling the target clutch to fill oil and keeping the clutch half-joint pressure value of the target clutch at the clutch half-joint pressure value of the previous moment of the target clutch;

step S12, controlling the oil filling of a target synchronizer corresponding to the target clutch to enable the target synchronizer to move a shifting fork at a preset pressure value, and finishing the oil filling of the target synchronizer when the position displacement of the target synchronizer is larger than or equal to a preset third threshold value;

step S13, controlling the target synchronizer to increase pressure by a preset slope, and acquiring the gear shifting pressure of the target synchronizer when the difference value between the rotating speed of the target clutch and the input rotating speed of the dual-clutch transmission meets a preset condition;

step S14, calculating the target clutch half-joint point transmission torque according to the shift pressure of the target synchronizer;

and step S15, updating the target clutch half-joint point pressure value according to the relation between the target clutch half-joint point transmission torque and the target clutch half-joint point transmission torque range.

Further, the determining that the target clutch of the dual clutch transmission satisfies the clutch half-joint pressure adaptive condition specifically includes:

judging whether the double-clutch transmission has no faults of a temperature sensor, a pressure sensor and an electromagnetic valve, judging whether the oil temperature of the double-clutch transmission is greater than a self-adaptive lowest temperature threshold value, judging whether the double-clutch transmission is currently in a steady-state gear and a shaft of a target clutch is an uncontrolled shaft, judging whether all shifting forks on the shaft of the target clutch are in a neutral position, judging whether the input torque of the double-clutch transmission is a positive value and greater than a lowest torque threshold value, and judging whether the current steady-state gear is not subjected to over-half joint point self-adaptation;

when the double-clutch transmission is in a fault without a temperature sensor, a pressure sensor and an electromagnetic valve, when the oil temperature of the double-clutch transmission is larger than a preset self-adaptive minimum temperature threshold value, when the double-clutch transmission is currently in a steady-state gear and a shaft where a target clutch is located is an uncontrolled shaft, and when all shifting forks on the shaft where the target clutch is located are in a neutral position, and when the input torque of the double-clutch transmission is a positive value and is larger than the preset minimum torque threshold value and the current steady-state gear is not subjected to excessive clutch connection point self-adaptation and is simultaneously established, the target clutch is judged to meet a clutch connection point pressure self-adaptation condition, otherwise, the target clutch is judged to not meet the clutch connection point pressure self-adaptation condition.

Further, the step of controlling the target clutch to fill oil and maintaining the clutch half-engagement point pressure value of the target clutch at the clutch half-engagement point pressure value of the previous time of the target clutch specifically includes:

controlling the target clutch to fill oil and keeping the pressure value of the half-joint point of the clutch of the target clutch as the pressure value of the half-joint point of the clutch at the previous moment of the target clutch, and finishing the oil filling of the target clutch when the absolute value of the difference between the actual pressure value of the clutch of the target clutch and the pressure value of the half-joint point of the clutch of the target clutch is smaller than or equal to a preset first threshold value and the absolute value of the difference between the rotating speed of the target clutch and the input rotating speed of the automatic transmission is smaller than or equal to a preset second threshold value.

Further, step S13 specifically includes:

s131, controlling the target synchronizer to increase pressure by a preset slope, acquiring a first rotation speed difference value at the initial time of pressure increase of the target synchronizer, and continuously acquiring a second rotation speed difference value, wherein when the absolute value of the difference value between the second rotation speed difference value and the first rotation speed difference value is greater than or equal to a preset fourth threshold value, the pressure of the target synchronizer stops increasing, the first rotation speed difference value is the absolute value of the difference value between the rotation speed of the target clutch and the input rotation speed of the dual-clutch transmission at the initial time of pressure increase of the target synchronizer, and the second rotation speed difference value is the absolute value of the difference value between the rotation speed of the target clutch and the input rotation speed of the dual-clutch transmission after the initial time;

and S132, controlling the target synchronizer to maintain a last-moment pressure value, and when the last-moment pressure maintaining time is longer than a preset time threshold, acquiring the last-moment pressure value as the shifting pressure of the target synchronizer.

Further, step S14 specifically includes:

s141, calculating the synchronizing torque of the target synchronizer according to the shifting pressure of the target synchronizer, the number of friction conical surfaces of the target synchronizer, the friction radius of the target synchronizer and the cone angle of the target synchronizer;

and S142, calculating the half-joint-point transmission torque of the target clutch according to the transmission ratio from the driven end of the target clutch to the driving end of the target synchronizer and the fact that the torque transmitted to the target clutch end by the synchronous torque of the target synchronizer is equal to the half-joint-point transmission torque of the target clutch.

Further, step S15 specifically includes:

comparing the target clutch half-engagement point transfer torque to the target clutch half-engagement point transfer torque range;

when the target clutch half-joint point transmission torque is larger than a lower limit threshold value of a preset target clutch half-joint point transmission torque and is smaller than an upper limit threshold value of the preset target clutch half-joint point transmission torque, adaptively updating the target clutch half-joint point pressure value to be a target clutch half-joint point pressure value before updating;

when the target clutch half-joint point transmission torque is larger than or equal to the upper limit threshold of the preset target clutch half-joint point transmission torque, adaptively updating the target clutch half-joint point pressure value to be equal to the difference value of the target clutch half-joint point pressure value before updating and a first adjustment step length of the clutch half-joint point pressure;

when the absolute value of the difference value of the target clutch half-joint point transmission torque and the upper limit threshold value of the preset target clutch half-joint point transmission torque is larger than the maximum value of the difference value of the preset target clutch half-joint point, the first adjustment step length of the clutch half-joint point pressure is the maximum value of the adjustment step length of the preset clutch half-joint point pressure;

when the absolute value of the difference between the target clutch half-engagement point transmission torque and the preset target clutch half-engagement point transmission torque upper limit threshold is greater than or equal to 0 and less than or equal to the preset target clutch half-engagement point difference threshold,

the first adjustment step length of the pressure of the half-joint point of the clutch is as follows: multiplying the maximum value of the preset clutch half-joint point pressure adjustment step length by the absolute value of the difference value of the target clutch half-joint point transmission torque and the upper limit threshold value of the preset target clutch half-joint point transmission torque, and then dividing the absolute value by the maximum value of the preset target clutch half-joint point difference value;

when the target clutch half-joint point transmission torque is smaller than or equal to the lower limit threshold of the preset target clutch half-joint point transmission torque, adaptively updating the target clutch half-joint point pressure value to be equal to the sum of the target clutch half-joint point pressure value before updating and a second adjustment step length of the clutch half-joint point pressure;

when the absolute value of the difference value of the lower limit threshold value of the target clutch half-joint point transmission torque and the preset target clutch half-joint point transmission torque is larger than the maximum value of the difference value of the preset target clutch half-joint point, the clutch half-joint point pressure adjusting step length is the maximum value of the preset clutch half-joint point pressure adjusting step length;

when the absolute value of the difference value of the lower limit threshold value of the target clutch half-joint point transmission torque and the preset target clutch half-joint point transmission torque is greater than or equal to 0 and is less than or equal to the preset target clutch half-joint point difference maximum value, the second adjustment step length of the clutch half-joint point pressure is as follows: and multiplying the maximum value of the preset clutch half-joint point pressure adjusting step length by the absolute value of the difference value of the target clutch half-joint point transmission torque and the lower limit threshold value of the preset target clutch half-joint point transmission torque, and then dividing the absolute value by the maximum value of the preset target clutch half-joint point difference value.

The invention provides a semi-joint pressure self-adaptive system of a clutch of a double-clutch transmission, which comprises:

the judging unit is used for judging whether a target clutch of the wet type double-clutch and double-clutch transmission meets a clutch half-joint pressure self-adaptive condition or not;

the first control unit is used for controlling the target clutch to charge oil and keeping the pressure value of the clutch half-joint point of the target clutch at the previous moment of the target clutch if the target clutch of the wet type double-clutch transmission meets the self-adaptive condition of the pressure of the clutch half-joint point;

the second control unit is used for controlling oil filling of a target synchronizer corresponding to the target clutch, so that the target synchronizer moves a shifting fork at a preset pressure value, and when the position displacement of the target synchronizer is larger than or equal to a preset third threshold value, the oil filling of the target synchronizer is finished;

the third control unit is used for controlling the pressure of the target synchronizer to increase by a preset slope, and acquiring the shifting pressure of the target synchronizer when the difference value of the rotating speed of the target clutch and the input rotating speed of the dual-clutch transmission meets a preset condition;

a first calculation unit configured to calculate the target clutch half-engagement point transmission torque according to a shift pressure of the target synchronizer;

and the adjusting unit is used for updating the pressure value of the half-joint point of the target clutch according to the relation between the transmission torque of the half-joint point of the target clutch and the transmission torque range of the half-joint point of the target clutch.

Further, the judging unit includes:

the first judgment module is used for judging whether the double-clutch transmission has no faults of a temperature sensor, a pressure sensor and an electromagnetic valve;

the second judgment module is used for judging whether the oil temperature of the dual-clutch transmission is greater than a self-adaptive minimum temperature threshold value or not;

the third judgment module is used for judging whether the double-clutch transmission is in a steady-state gear currently or not and whether a shaft where a target clutch is located is an uncontrolled shaft;

the fourth judging module is used for judging whether all shifting forks on the shaft of the target clutch are in neutral positions or not;

the fifth judgment module is used for judging whether the input torque of the dual-clutch transmission is a positive value and is greater than the lowest torque threshold value;

the sixth judgment module is used for judging whether the semi-joint self-adaption is not carried out on the current steady-state gear;

and the judging module is used for judging that the target clutch meets the clutch half-joint pressure adaptive condition when the double-clutch transmission is not provided with the faults of the temperature sensor, the pressure sensor and the electromagnetic valve and the oil temperature of the double-clutch transmission is greater than a preset adaptive minimum temperature threshold value, when the double-clutch transmission is currently in a steady-state gear, the shaft of the target clutch is an uncontrolled shaft, and when all shifting forks on the shaft of the target clutch are in a neutral position, when the input torque of the double-clutch transmission is a positive value and is greater than a preset minimum torque threshold value and the current steady-state gear is not subjected to half-joint self-adaptation and is simultaneously established, otherwise, judging that the target clutch does not meet the clutch half-joint pressure adaptive condition.

Further, the first control unit is specifically configured to:

controlling the target clutch to fill oil and keeping the pressure value of the half-joint point of the clutch of the target clutch as the pressure value of the half-joint point of the clutch at the previous moment of the target clutch, and finishing the oil filling of the target clutch when the absolute value of the difference between the actual pressure value of the clutch of the target clutch and the pressure value of the half-joint point of the clutch of the target clutch is smaller than or equal to a preset first threshold value and the absolute value of the difference between the rotating speed of the target clutch and the input rotating speed of the automatic transmission is smaller than or equal to a preset second threshold value.

Further, the third control unit includes:

the first control module is used for controlling the pressure of the target synchronizer to increase by a preset slope, acquiring a first rotation speed difference value at the initial time of the pressure increase of the target synchronizer, and continuously acquiring a second rotation speed difference value, wherein when the absolute value of the difference between the second rotation speed difference value and the first rotation speed difference value is larger than or equal to a preset fourth threshold value, the pressure of the target synchronizer stops increasing, the first rotation speed difference value is the absolute value of the difference between the rotation speed of the target clutch and the input rotation speed of the dual-clutch transmission at the initial time of the pressure increase of the target synchronizer, and the second rotation speed difference value is the absolute value of the difference between the rotation speed of the target clutch and the input rotation speed of the dual-clutch transmission after the initial time;

and the second control module is used for controlling the target synchronizer to maintain a last-moment pressure value, and acquiring the last-moment pressure value as the shifting pressure of the target synchronizer when the last-moment pressure maintaining time is longer than a preset time threshold.

The implementation of the invention has the following beneficial effects:

according to the invention, the target clutch half-joint point transmission torque is obtained through calculation, the target clutch half-joint point transmission torque and the target clutch half-joint point transmission torque range are compared, and when the target clutch half-joint point transmission torque is not in the normal range, the pressure value of the target clutch half-joint point is adjusted, so that the vehicle starting, creeping and gear lifting control are normal, and the problems that the starting, creeping and gear lifting control are influenced due to the change of the clutch half-joint point caused by the use process of the existing double-clutch transmission, the aging of a hydraulic system and the abrasion of a friction plate or a hydraulic cylinder of the transmission are solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a transmission configuration of a dual clutch transmission provided by an embodiment of the present invention.

FIG. 2 is a flow chart of a dual clutch transmission clutch half-nip pressure adaptation method provided by an embodiment of the present invention.

FIG. 3 is a main flow chart of a dual clutch transmission clutch half-nip pressure adaptation method provided by an embodiment of the present invention.

Fig. 4 is a flowchart of an adaptive operation of half-join-point pressure according to an embodiment of the present invention.

Fig. 5 is a schematic diagram of a process provided by an embodiment of the invention.

FIG. 6 is a block diagram of a dual clutch transmission clutch half-nip pressure adaptive system provided by an embodiment of the present invention.

Detailed Description

In this patent, it is determined whether the target clutch half-engagement point transmission torque is within a normal range, and a pressure value of the target clutch half-engagement point is adjusted or not according to the determination result.

As shown in fig. 1, the embodiment of the present invention provides a transmission structure of a dual clutch transmission, in which a synchronizer generates a synchronizing torque under the action of a shifting pressure, the synchronizing torque is transmitted to a clutch driven end through a transmission ratio from the clutch to the synchronizer, and after the torque overcomes a torque transmitted by a clutch half-joint pressure, a difference between a clutch and an input rotation speed is enlarged.

As shown in FIG. 2, an embodiment of the present invention provides a dual clutch transmission clutch half-nip pressure adaptation method, comprising:

the method is described with reference to fig. 3 to 5 together.

And step S11, when judging whether the target clutch of the double-clutch transmission meets the clutch half-joint pressure self-adaptive condition, controlling the target clutch to fill oil and keeping the clutch half-joint pressure value of the target clutch at the clutch half-joint pressure value of the previous moment of the target clutch.

It should be noted that the target clutch refers to a clutch that is in an idle state in an initial stage, and one clutch is always in an idle state in the dual clutch transmission.

Equivalent to step1 in fig. 3, the step of determining that the target clutch of the dual clutch transmission satisfies the clutch half-nip pressure adaptive condition specifically includes:

judging whether the double-clutch transmission has no faults of a temperature sensor, a pressure sensor and an electromagnetic valve, judging whether the oil temperature of the double-clutch transmission is greater than a self-adaptive lowest temperature threshold value, judging whether the double-clutch transmission is currently in a steady-state gear and a shaft of a target clutch is an uncontrolled shaft, judging whether all shifting forks on the shaft of the target clutch are in a neutral position, judging whether the input torque of the double-clutch transmission is a positive value and greater than a lowest torque threshold value, and judging whether the current steady-state gear is not subjected to over-half joint point self-adaptation;

when the double-clutch transmission is in a fault without a temperature sensor, a pressure sensor and an electromagnetic valve, when the oil temperature of the double-clutch transmission is larger than a preset self-adaptive minimum temperature threshold value, when the double-clutch transmission is currently in a steady-state gear and a shaft where a target clutch is located is an uncontrolled shaft, and when all shifting forks on the shaft where the target clutch is located are in a neutral position, and when the input torque of the double-clutch transmission is a positive value and is larger than the preset minimum torque threshold value and the current steady-state gear is not subjected to excessive clutch connection point self-adaptation and is simultaneously established, the target clutch is judged to meet a clutch connection point pressure self-adaptation condition, otherwise, the target clutch is judged to not meet the clutch connection point pressure self-adaptation condition.

Corresponding to step2 in fig. 3, specifically, controlling the target clutch to fill oil and maintain the clutch half-engagement point pressure value of the target clutch at the clutch half-engagement point pressure value of the previous time of the target clutch includes:

controlling the target clutch to fill oil and keeping the pressure value of the half-joint point of the clutch of the target clutch as the pressure value of the half-joint point of the clutch at the previous moment of the target clutch, and finishing the oil filling of the target clutch when the absolute value of the difference value between the actual pressure value of the clutch of the target clutch and the pressure value of the half-joint point of the clutch of the target clutch is smaller than or equal to a preset first threshold value and the absolute value of the difference value between the rotating speed of the target clutch and the input rotating speed of the double-clutch transmission is smaller than a preset second threshold value.

With reference to fig. 5, controlling the target clutch to fill oil and keeping a clutch half-coupling point pressure value of the target clutch at a previous time half-coupling point pressure value of the target clutch corresponding to a self-learning preparation stage, wherein in a clutch pressure and time coordinate system, the clutch half-coupling point pressure value of the target clutch corresponds to a target pressure value identified by a solid line, an actual clutch pressure value of the target clutch corresponds to an actual pressure value identified by a dotted line, and an absolute value of a difference value between the two is gradually reduced as the self-learning preparation stage progresses;

in the rotating speed and time coordinate system, the rotating speed of the target clutch corresponds to the clu1 rotating speed marked by a dotted line, namely the rotating speed of the first clutch, and the first clutch is the target clutch at the moment; the input speed of the dual clutch transmission corresponds to the input speed identified by the solid line.

When the target clutch of the wet type dual-clutch transmission is judged to meet the clutch half-joint pressure self-adaptive condition, the clutch half-joint pressure value of the target clutch is the clutch half-joint pressure value ClutchKissPtPressTargt at the moment before the target clutch used by the dual-clutch transmission, and the actual clutch pressure value ClutchPress of the target clutch and the rotating speed ClutchSpeed of the target clutch are detected at the same time; ending the target clutch fill when the absolute value of the difference between ClutchPress and ClutchKissPtPresstTargt is less than or equal to a preset first threshold, the preset first threshold being ClutchPressthreshold, i.e., | ClutchPress-ClutchKissPtPresstTargt | ≦ ClutchPressthreshold, and the absolute value of the difference between the target clutch rotational speed ClutchSpeed and the input rotational speed InputSpeed of the dual clutch transmission is less than or equal to a preset second threshold, the preset second threshold being ClutchSpeedDvaluedThrhold, i.e., | ClutchSpeed-InputSpeed | ≦ ClutchSpeedDvaluedThread.

And S12, controlling the target synchronizer corresponding to the target clutch to fill oil, enabling the target synchronizer to move a shifting fork at a preset pressure value, and finishing the oil filling of the target synchronizer when the position displacement of the target synchronizer is larger than or equal to a preset third threshold value.

It should be noted that the target synchronizer refers to a synchronizer that is in an idle state in an initial stage.

It should be further noted that the preset pressure value ensures that the shifting fork moves, after the preset pressure is set for the target synchronizer, the preset pressure corresponds to the target pressure, the position displacement of the target synchronizer is detected, and when the position displacement syncpositionmore of the target synchronizer is greater than or equal to a preset third threshold syncpositionmore threshold, that is, syncpositionmore is greater than or equal to syncpositionmore threshold, the oil filling of the target synchronizer is finished.

Referring to fig. 5, step S12 corresponds to stage a of the self-learning process, where the target synchronizer is in the neutral position.

And step S13, controlling the target synchronizer to increase pressure by a preset slope, and acquiring the gear shifting pressure of the target synchronizer when the difference value of the rotating speed of the target clutch and the input rotating speed of the dual-clutch transmission meets a preset condition.

Step S13 includes:

step S131, controlling the target synchronizer to increase pressure by a preset slope, acquiring a first rotation speed difference value at the initial time of pressure increase of the target synchronizer, and continuously acquiring a second rotation speed difference value, wherein when the absolute value of the difference between the second rotation speed difference value and the first rotation speed difference value is greater than or equal to a preset fourth threshold value, the pressure of the target synchronizer stops increasing, wherein the first rotation speed difference value is the absolute value of the difference between the rotation speed of the target clutch and the input rotation speed of the dual-clutch transmission at the initial time of pressure increase of the target synchronizer, and the second rotation speed difference value is the absolute value of the difference between the rotation speed of the target clutch and the input rotation speed of the dual-clutch transmission after the initial time;

step S132, controlling the target synchronizer to maintain a last-moment pressure value, and when the last-moment pressure maintaining time is longer than a preset time threshold, acquiring the last-moment pressure value as the gear shifting pressure of the target synchronizer.

Referring to fig. 5, step S131 corresponds to the stage b in the self-learning process, and at the initial time when the pressure of the target synchronizer increases with the preset slope, and at the same time, in the rotational speed and time coordinate system, the rotational speed of the target clutch, i.e., the rotational speed clu1 indicated by the dotted line, and the input rotational speed of the dual clutch transmission, i.e., the input rotational speed indicated by the solid line, are obtained, the first rotational speed difference is equal to the initial time when the pressure of the target synchronizer increases with the preset slope, the absolute value of the difference between the input rotational speed of the dual clutch transmission and the rotational speed clu1 is obtained, the second rotational speed difference is gradually increased as viewed from the figure, and step S131 ends at the initial time of stage c in the self-learning process.

Referring to fig. 5, in step S132, corresponding to the stage c in the self-learning process, the pressure value of the control target synchronizer is not changed, where the pressure value of the control target synchronizer refers to the target pressure.

And step S14, calculating the target clutch half-joint point transmission torque according to the shift pressure of the target synchronizer.

Step S14 specifically includes step S141 and step S142, specifically:

and step S141, calculating the synchronizing torque of the target synchronizer according to the shifting pressure of the target synchronizer, the number of friction conical surfaces of the target synchronizer, the friction radius of the target synchronizer and the cone angle of the target synchronizer.

Specifically, the formula for implementing step S141 is specifically:

syncacttorqisspt ═ (consurface q × FrictCoeff × frictratadius × SyncActPressStep)/sin (ConAngle), where syncacttorqisspt is the synchronization torque of the target synchronizer, consurface q is the number of friction cones of the target synchronizer, FrictCoeff is the friction coefficient of the cone of the target synchronizer, frictratadius is the friction radius of the target synchronizer, SyncActPressStep is the shift pressure of the target synchronizer, and ConAngle is the cone angle of the target synchronizer.

It should be noted that the shift pressure of the target synchronizer in step S141 is the pressure value of the target synchronizer at the end of step S132.

It should be further noted that fig. 4 corresponds to all the steps S14 to S15 in this embodiment.

And step S142, calculating the half-joint-point transmission torque of the target clutch according to the transmission ratio from the driven end of the target clutch to the driving end of the target synchronizer and the fact that the torque transmitted to the target clutch end by the synchronous torque of the target synchronizer is equal to the half-joint-point transmission torque of the target clutch.

Specifically, the formula for implementing step S142 is specifically:

ClutchKissPtActTorq ═ SyncActTorqKissPt/TrnmRadioClutch2Sync, wherein ClutchKissPtActTorq is torque transmitted by a half-joint point of a target clutch, SyncActTorqKissPt is synchronous torque of the target synchronizer, and TrnmRadioClutch2Sync is a transmission ratio from a driven end of the target clutch to a driving end of the target synchronizer.

And step S15, updating the target clutch half-joint point pressure value according to the relation between the target clutch half-joint point transmission torque and the target clutch half-joint point transmission torque range.

Specifically, the target clutch half-engagement point transmission torque is compared with the target clutch half-engagement point transmission torque range;

it should be noted that clutchkissptcattreq (TorqDefineLimMin, TorqDefineLimMax) is a target clutch half-engagement point transmission torque range, the TorqDefineLimMin is a lower threshold of a preset target clutch half-engagement point transmission torque, the TorqDefineLimMax is an upper threshold of the preset target clutch half-engagement point transmission torque, the target clutch half-engagement point transmission torque range is generally obtained according to experiments, and if the target clutch half-engagement point transmission torque is not within a normal range, it indicates that a target clutch half-engagement point pressure value needs to be adjusted.

When the target clutch half-joint point transmission torque is larger than a lower limit threshold value of a preset target clutch half-joint point transmission torque and is smaller than an upper limit threshold value of the preset target clutch half-joint point transmission torque, adaptively updating the target clutch half-joint point pressure value to be a target clutch half-joint point pressure value before updating;

it should be noted that, when torqdefinellimmin < clutchkisscpttorq < torqdefinellimmiax, the target clutch half-engagement point pressure value remains unchanged, i.e., ClutchKissPtPressNw ═ ClutchKissPtPressBf, where ClutchKissPtPressNw is the target clutch half-engagement point pressure after adaptive update, and ClutchKissPtPressBf is the target clutch half-engagement point pressure value before update.

When the target clutch half-joint point transmission torque is larger than or equal to the upper limit threshold of the preset target clutch half-joint point transmission torque, adaptively updating the target clutch half-joint point pressure value to be equal to the difference value of the clutch half-joint point pressure value before updating and the first adjustment step length of the clutch half-joint point pressure;

it should be noted that when ClutchKissPtActTorq ≧ TorqDefineLimMax, the current target clutch half-engagement point pressure is greater and needs to be decreased, i.e., ClutchKissPtPressnw ═ ClutchKissPtPressBf-ClutchKissPtPressAdaptStep 1, where ClutchKissPtPressAdaptStep1 is the first adjustment step for the clutch half-engagement point pressure.

When the absolute value of the difference value of the target clutch half-joint point transmission torque and the upper limit threshold value of the preset target clutch half-joint point transmission torque is larger than the maximum value of the difference value of the preset target clutch half-joint point, the first adjustment step length of the clutch half-joint point pressure is the maximum value of the adjustment step length of the preset clutch half-joint point pressure;

it should be noted that kissptttorqdiff 1 ═ cluttchkisssttorq-TorqDefineLimMax |, where kissptttorqdiff 1 > kispttorqdiffmax, which is a preset target clutch half-engagement transmission torque difference maximum value, said kispttttorqdiff 1 is an absolute value of a difference between the target clutch half-engagement point transmission torque and an upper threshold value of the preset target clutch half-engagement point transmission torque; cluttchkisssptpressadaptstepp 1 ═ cluttkissptpressadaptstepmax, where cluttkissptpressadaptstepmax is a preset clutch half-engagement point pressure adjustment step maximum value.

When the absolute value of the difference between the target clutch half-engagement point transmission torque and the preset target clutch half-engagement point transmission torque upper limit threshold is greater than or equal to 0 and less than or equal to the preset target clutch half-engagement point difference threshold,

the first adjustment step length of the pressure of the half-joint point of the clutch is as follows: multiplying the maximum value of the preset clutch half-joint point pressure adjustment step length by the absolute value of the difference value of the target clutch half-joint point transmission torque and the upper limit threshold value of the preset target clutch half-joint point transmission torque, and then dividing the absolute value by the maximum value of the preset target clutch half-joint point difference value;

it should be noted that when 0 ≦ kisspttrqdiff 1 ≦ kisspttrqdiffmax, ClutchKissPtPressAdaptStep1 ≦ kissphttfdiff (clutchkissptpresspressadaptstepmax × kispttorquf 1)/kispttorqufmax, the ClutchKissPtPressAdaptStep1 is a first clutch half-engagement-point pressure adjustment step size, the clutchkisskisspresspresspressadaptstepmax is a preset clutch half-engagement-point pressure adjustment step size maximum value, the kisspttqtorqf diff1 is an absolute value of a difference between the target clutch half-engagement-point transmission torque and an upper threshold value of the preset target clutch half-engagement-point transmission torque, and the kisptttqtdiffmax is a preset target clutch half-engagement-point difference maximum value.

When the target clutch half-joint point transmission torque is smaller than or equal to the lower limit threshold of the preset target clutch half-joint point transmission torque, adaptively updating the target clutch half-joint point pressure value to be equal to the sum of the target clutch half-joint point pressure value before updating and a second adjustment step length of the clutch half-joint point pressure;

it should be noted that clutchkisssapttttorq ≦ torqdefinelimn, the current clutch half-engagement point pressure is smaller and needs to be larger, i.e., clutchkissstptpressnw ═ clutchkisptpressbf + clutchkisptpressptpresspressadaptstep 2, where clutchkissstptpressadaptstep 2 clutch half-engagement point pressure is the second adjustment step.

When the absolute value of the difference value of the lower limit threshold value of the target clutch half-joint point transmission torque and the preset target clutch half-joint point transmission torque is larger than the maximum value of the difference value of the preset target clutch half-joint point, the second adjustment step length of the clutch half-joint point pressure is the maximum value of the preset clutch half-joint point pressure adjustment step length;

note that kissptthtrqdiff 2 is | cluttchkisssptacttorq-TorqDefineLimMin |, when said kissptthtrqdiff 2 > kispttorqdiffmax, cluttchkisssptpresspresspresspressadaptstepp 2 is | -cluttchkiskisptpresspresspressadaptstepmax.

When the absolute value of the difference value of the lower limit threshold value of the target clutch half-joint point transmission torque and the preset target clutch half-joint point transmission torque is greater than or equal to 0 and is less than or equal to the preset target clutch half-joint point difference maximum value, the second adjustment step length of the clutch half-joint point pressure is as follows: and multiplying the maximum value of the preset clutch half-joint point pressure adjusting step length by the absolute value of the difference value of the target clutch half-joint point transmission torque and the lower limit threshold value of the preset target clutch half-joint point transmission torque, and then dividing the absolute value by the maximum value of the preset target clutch half-joint point difference value.

Note that when 0 ≦ kissptttorqdiff 2 ≦ kissptttorqdiffmax, cluttchkisssptpressreadaptstepstep 2 ═ cluttkissptpresupputstepmax × kispttorqdiff 2)/kispttorqdiffmax.

And after updating the half-joint pressure value of the target clutch is finished, controlling the target synchronizer to enter a neutral position, and controlling the target clutch to be disengaged.

As shown in FIG. 6, an embodiment of the present invention provides a dual clutch transmission clutch half-nip pressure adaptive system, comprising:

a judgment unit 61 for judging whether a target clutch of the wet type dual-clutch transmission satisfies a clutch half-joint pressure adaptive condition;

a first control unit 62, configured to control the target clutch to fill oil and maintain a clutch half-engagement point pressure value of the target clutch at a clutch half-engagement point pressure value before a target clutch if the target clutch of the wet dual-clutch transmission meets a clutch half-engagement point pressure adaptive condition; the second control unit 63 is configured to control the target synchronizer corresponding to the target clutch to fill oil, so that the target synchronizer moves the shift fork at a preset pressure value, and when the position displacement of the target synchronizer is greater than or equal to a preset third threshold, the oil filling of the target synchronizer is finished;

a third control unit 64 configured to control the pressure of the target synchronizer to increase at a preset slope, and acquire the shift pressure of the target synchronizer when a difference between the rotation speed of the target clutch and the input rotation speed of the dual clutch transmission meets a preset condition;

a first calculation unit 65 for calculating the target clutch half-engagement point transmission torque based on the shift pressure of the target synchronizer;

an adjusting unit 66, configured to update the target clutch half-engagement point pressure value according to a relationship between the target clutch half-engagement point transmission torque and the target clutch half-engagement point transmission torque range;

further, the judging unit 61 includes:

the first judgment module is used for judging whether the double-clutch transmission has no faults of a temperature sensor, a pressure sensor and an electromagnetic valve;

the second judgment module is used for judging whether the oil temperature of the dual-clutch transmission is greater than a self-adaptive minimum temperature threshold value or not;

the third judgment module is used for judging whether the double-clutch transmission is in a steady-state gear currently or not and whether a shaft where a target clutch is located is an uncontrolled shaft;

the fourth judging module is used for judging whether all shifting forks on the shaft of the target clutch are in neutral positions or not;

the fifth judgment module is used for judging whether the input torque of the dual-clutch transmission is a positive value and is greater than the lowest torque threshold value;

the sixth judgment module is used for judging whether the semi-joint self-adaption is not carried out on the current steady-state gear;

and the judging module is used for judging that the target clutch meets the clutch half-joint pressure adaptive condition when the double-clutch transmission is not provided with the faults of the temperature sensor, the pressure sensor and the electromagnetic valve and the oil temperature of the double-clutch transmission is greater than a preset adaptive minimum temperature threshold value, when the double-clutch transmission is currently in a steady-state gear, the shaft of the target clutch is an uncontrolled shaft, and when all shifting forks on the shaft of the target clutch are in a neutral position, when the input torque of the double-clutch transmission is a positive value and is greater than a preset minimum torque threshold value and the current steady-state gear is not subjected to half-joint self-adaptation and is simultaneously established, otherwise, judging that the target clutch does not meet the clutch half-joint pressure adaptive condition.

Further, the first control unit 62 is specifically configured to:

controlling the target clutch to fill oil and keeping the pressure value of the half-joint point of the clutch of the target clutch as the pressure value of the half-joint point of the clutch at the previous moment of the target clutch, and finishing the oil filling of the target clutch when the absolute value of the difference between the actual pressure value of the clutch of the target clutch and the pressure value of the half-joint point of the clutch of the target clutch is smaller than or equal to a preset first threshold value and the absolute value of the difference between the rotating speed of the target clutch and the input rotating speed of the automatic transmission is smaller than or equal to a preset second threshold value.

Further, the third control unit 64 includes:

the first control module is used for controlling the pressure of the target synchronizer to increase by a preset slope, acquiring a first rotation speed difference value at the initial time of the pressure increase of the target synchronizer, and continuously acquiring a second rotation speed difference value, wherein when the absolute value of the difference between the second rotation speed difference value and the first rotation speed difference value is larger than or equal to a preset fourth threshold value, the pressure of the target synchronizer stops increasing, the first rotation speed difference value is the absolute value of the difference between the rotation speed of the target clutch and the input rotation speed of the dual-clutch transmission at the initial time of the pressure increase of the target synchronizer, and the second rotation speed difference value is the absolute value of the difference between the rotation speed of the target clutch and the input rotation speed of the dual-clutch transmission after the initial time;

and the second control module is used for controlling the target synchronizer to maintain a last-moment pressure value, and acquiring the last-moment pressure value as the shifting pressure of the target synchronizer when the last-moment pressure maintaining time is longer than a preset time threshold.

The implementation of the invention has the following beneficial effects:

according to the invention, the target clutch half-joint point transmission torque is obtained through calculation, the target clutch half-joint point transmission torque and the target clutch half-joint point transmission torque range are compared, and when the target clutch half-joint point transmission torque is not in the normal range, the pressure value of the target clutch half-joint point is adjusted, so that the vehicle starting, creeping and gear lifting control are normal, and the problems that the starting, creeping and gear lifting control are influenced due to the change of the clutch half-joint point caused by the use process of the existing double-clutch transmission, the aging of a hydraulic system and the abrasion of a friction plate or a hydraulic cylinder of the transmission are solved.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.