CN113551031B - Automatic gearbox gear selection control method and system - Google Patents
Automatic gearbox gear selection control method and system Download PDFInfo
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- CN113551031B CN113551031B CN202111013605.0A CN202111013605A CN113551031B CN 113551031 B CN113551031 B CN 113551031B CN 202111013605 A CN202111013605 A CN 202111013605A CN 113551031 B CN113551031 B CN 113551031B
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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
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/68—Inputs being a function of gearing status
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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
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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
- F16H61/0213—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 characterised by the method for generating shift signals
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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
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/30—Constructional features of the final output mechanisms
- F16H63/32—Gear shift yokes, e.g. shift forks
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gear-Shifting Mechanisms (AREA)
- Control Of Transmission Device (AREA)
Abstract
The invention provides a gear selection control method and a gear selection control system for an automatic gearbox, wherein the method comprises the following steps: and acquiring a current shifting fork position and a requested target gear, and determining the shifting fork target position according to the requested target gear. And carrying out gear selection control identification according to the current shifting fork position and the shifting fork target position so as to determine gear selection driving force. And acquiring an electric cylinder characteristic curve, and establishing a corresponding table of driving force and driving current according to the electric cylinder characteristic curve. And looking up the corresponding table according to the gear selection driving force to obtain expected current, and converting a PWM driving signal according to the expected current and a set duty ratio to drive a gear selection shifting head. The invention can improve the reliability of the automatic gearbox and increase the safety of the automobile.
Description
Technical Field
The invention relates to the technical field of automobile gearbox control, in particular to a gear selection control method and system for an automatic gearbox.
Background
At present, the automatic gear whole vehicle of the commercial vehicle is gradually paid attention to and welcomed by the market, and the main application working conditions of the commercial vehicle are long-distance transportation, urban goods pulling and the like, so that driving fatigue can be relieved by the automatic gear, and driving feeling is improved. Because the control strategy is the core technology of the automatic gearbox control system, no directly applicable scheme exists in the prior art, as for deeper technical schemes, different manufacturers have different control schemes, and the AMT automatic gearbox formed by the gear selecting and shifting actuating mechanism based on the wet clutch and the electric cylinder control mode which is independently researched and developed by a certain host factory in China has the working principle that: the speed changing box control system TCU calculates the vehicle state in real time, when the required gear is identified, the TCU can firstly disengage the clutch to carry out gear picking, gear selecting and gear engaging operations, and then the TCU is combined with the clutch after the gear is engaged. However, in the control mode, short-time power interruption exists in the gear shifting process, so that the problem of low gear shifting accuracy is caused. Therefore, the method has important research significance on providing a matching strategy for the gear selecting and shifting control of the ATM.
Disclosure of Invention
The invention provides a gear selection control method and system for an automatic gearbox, which solve the problem of low accuracy of the gear selection control of the conventional automatic gearbox, can improve the reliability of the automatic gearbox, and can improve the use safety of an automobile.
In order to achieve the above purpose, the invention provides the following technical scheme:
a gear selection control method for an automatic gearbox comprises the following steps:
acquiring a current shifting fork position and a requested target gear, and determining a shifting fork target position according to the requested target gear;
carrying out gear selection control identification according to the current shifting fork position and the shifting fork target position so as to determine gear selection driving force;
acquiring an electric cylinder characteristic curve, and establishing a corresponding table of driving force and driving current according to the electric cylinder characteristic curve;
and looking up the corresponding table according to the gear selection driving force to obtain expected current, and converting a PWM driving signal according to the expected current and a set duty ratio to drive a gear selection shifting head.
Preferably, the method further comprises the following steps:
selecting an initial driving force according to the current shift fork position if the gear selection control is identified as gear selection-gear off control, gear selection-gear up-gear control or gear selection-gear down-gear control;
after the work lasts for a set time, acquiring the angular displacement speed and the displacement of the shifting fork, and determining the target displacement difference value of the current shifting fork according to the displacement of the shifting fork;
and selecting a driving force variation gradient according to the shifting fork angular displacement speed and the target displacement difference value, and outputting a gear selection driving force according to the driving force variation gradient.
Preferably, the method further comprises the following steps:
when the gear selection control is identified as gear selection-upward gear control, selecting an initial driving force larger than the spring restoring force of the gear selection rod to push the gear selection rod to move upwards;
after the gear selection rod moves, gradually reducing the driving force to ensure that the gear selection rod moves forwards at a constant speed;
when the gear selection lever reaches a neutral position of a neutral line corresponding to the target position of the shifting fork, setting reverse driving force until the gear selection lever stops;
setting a driving force toward the requested target gear, moving the select lever toward the requested target gear, and gradually reducing the driving force to stably stop the select lever at the requested target gear.
Preferably, the method further comprises the following steps:
when the gear selection control is identified as gear selection-downward gear engagement control, selecting the initial driving force to be 0, and enabling the gear selection rod to move downward under the action of the restoring force of the spring;
after the gear selection rod moves, gradually increasing the driving force to ensure that the gear selection rod moves forwards at a constant speed;
when the gear selection rod reaches a neutral position of the neutral line corresponding to the target position of the shifting fork, increasing the driving force to stop the gear selection rod;
and setting the driving force to be 0 again, moving the gear selection rod again, controlling the driving force to slowly increase, and moving the gear selection rod to the requested target gear until the gear selection rod is stably stopped at the requested target gear.
Preferably, the method further comprises the following steps:
selecting an initial driving force to push a gear selection lever to move towards a neutral position when the gear selection control is identified as gear selection-gear selection control;
after the gear selection rod moves, gradually reducing the driving force to ensure that the gear selection rod moves forwards at a constant speed;
and when the gear selection lever reaches the neutral position of the neutral line corresponding to the target position of the shifting fork, setting reverse driving force until the gear selection lever stops.
The invention also provides a gear selection control system of the automatic gearbox, which comprises:
the first acquisition unit is used for acquiring a current shifting fork position and a requested target gear and determining a shifting fork target position according to the requested target gear;
the gear selection control identification unit is used for carrying out gear selection control identification according to the current shifting fork position and the shifting fork target position so as to determine gear selection driving force;
the second acquisition unit is used for acquiring an electric cylinder characteristic curve and establishing a corresponding table of driving force and driving current according to the electric cylinder characteristic curve;
and the driving unit is used for looking up the corresponding table according to the gear selection driving force so as to obtain expected current, and converting a PWM driving signal according to the expected current and a set duty ratio so as to drive the gear selection shifting head.
Preferably, the method further comprises the following steps:
a driving force selection unit for selecting an initial driving force according to the current shift fork position when the gear selection control is recognized as gear selection-off control, gear selection-up-shift control, or gear selection-down-shift control;
the third acquisition unit is used for acquiring the shifting fork angular displacement speed and shifting fork displacement after the work lasts for the set time, and determining the target displacement difference value of the current shifting fork according to the shifting fork displacement;
and the driving force control unit is used for selecting a driving force change gradient according to the shifting fork angular displacement speed and the target displacement difference value and outputting a gear selection driving force according to the driving force change gradient.
Preferably, the method further comprises the following steps:
an up-shift control unit for selecting an initial driving force greater than a spring restoring force of the select lever to push the select lever to move upward when the select control is identified as a select-up-shift control;
the upward gear control unit also gradually reduces the driving force after the gear selection rod moves so as to ensure that the gear selection rod moves forwards at a constant speed;
the upward gear control unit also sets reverse driving force when the gear selection rod reaches a neutral position of a neutral line corresponding to the target position of the shifting fork until the gear selection rod stops;
the upward engagement control unit further sets a driving force toward the requested target gear, moves the select lever toward the requested target gear, and gradually decreases the driving force to stably stop the select lever at the requested target gear.
Preferably, the method further comprises the following steps:
a down-shift control unit for selecting an initial driving force of 0 to move the select lever downward by a restoring force of a spring when the select control is identified as the select-down-shift control;
the downward gear control unit also increases the driving force step by step after the gear selection rod moves, so that the gear selection rod moves forwards at a constant speed;
the downward gear control unit also increases the driving force when the gear selection rod reaches a neutral position of a neutral line corresponding to the target position of the shifting fork, so that the gear selection rod stops;
the down-shift control unit also sets the driving force to 0 again, moves the select lever again, controls the driving force to increase slowly, and moves the select lever to the requested target gear until the select lever is stably stopped at the requested target gear.
Preferably, the method further comprises the following steps:
an off-shift control unit for selecting an initial driving force to push the select lever to move toward a neutral position when the select control is identified as a select-off-shift control;
the gear-selecting control unit also gradually reduces the driving force after the gear-selecting rod moves, so that the gear-selecting rod moves forwards at a constant speed;
and the gear-selecting control unit also sets reverse driving force when the gear-selecting rod reaches a neutral position of a neutral line corresponding to the target position of the shifting fork until the gear-selecting rod stops.
The invention provides a gear selection control method and a gear selection control system for an automatic gearbox. The problem of current automatic transmission select shift control to have the accuracy low is solved, automatic transmission's reliability can be improved, the security that the car used is increased.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings used in the embodiments will be briefly described below.
FIG. 1 is a schematic diagram of a method for controlling the gear selection of an automatic transmission according to the present invention.
Fig. 2 is a plan view of the mechanical position of the AMT gear selecting and shifting actuator provided by the present invention.
Fig. 3 is a schematic diagram of a stepped characteristic curve of the electric cylinder drive provided by the present invention.
Detailed Description
In order to make the technical field of the invention better understand the scheme of the embodiment of the invention, the embodiment of the invention is further described in detail with reference to the drawings and the implementation mode.
Aiming at the AMT automatic gearbox formed by the existing wet clutch and electric cylinder control mode gear selecting and shifting actuating mechanism, a matched control strategy is lacked for gear selecting control, and accurate and effective gear selecting and shifting control cannot be realized. The invention provides a gear selection control method and a gear selection control system for an automatic gearbox, which can ensure that a gear selection shifting head can be accurately adjusted to a corresponding position within a specified time by better dynamically adjusting a gear selection electric cylinder, thereby ensuring the smooth execution of subsequent gear engagement or gear disengagement control. The problem that the accuracy is low in the existing automatic gearbox gear selection control can be solved, the reliability of the automatic gearbox can be improved, and the use safety of an automobile is improved.
As shown in fig. 1, a gear selection control method for an automatic transmission includes:
s1: the method comprises the steps of obtaining a current shifting fork position and a requested target gear, and determining a shifting fork target position according to the requested target gear.
S2: and carrying out gear selection control identification according to the current shifting fork position and the shifting fork target position so as to determine gear selection driving force.
S3: and acquiring an electric cylinder characteristic curve, and establishing a corresponding table of driving force and driving current according to the electric cylinder characteristic curve.
S4: and looking up the corresponding table according to the gear selection driving force to obtain expected current, and converting a PWM driving signal according to the expected current and a set duty ratio to drive a gear selection shifting head.
In practical applications, the AMT gear selecting and shifting actuator mechanical position plan view is shown in fig. 2, and when the shift position is in the initial state of the neutral position, the gear selecting dial is at the lowest position of the neutral line (corresponding to Fork 1). When a requested gear is sent, if the requested gear is 1 gear, the TCU needs to control the gear selection electric cylinder to drive the gear selection shifting block to reach the horizontal position of Fork2 firstly, and then control the gear shifting electric cylinder to drive the shifting block to be engaged into the 1 gear position after the TCU is stable, and at the moment, the gear selection and shifting control of the requested 1 gear is completed; if the neutral position is requested again, the TCU needs to control the gear selection electric cylinder to be at the middle position of Fork2 to avoid the clamping stagnation of the shift Fork contacting with the shift Fork groove, then control the gear shifting electric cylinder to push to the neutral position of neutral line, and then control the gear selection electric cylinder to return to the original neutral position of Fork 1. The gear selecting shifting Fork system is composed of a three-order spring system, the spring is in a release state by default, the spring is in a neutral position of a Fork1 neutral line at the moment, and when the gear selecting electric cylinder drives, a shifting head can be pushed to compress the spring to perform gear selecting control. As shown in fig. 3, there is a characteristic curve that is stepped like due to the difference in the spring constant of the third order. The overall control idea of the method is as follows: after the requested gear is sent out, the TCU calculates the gear selection driving force through a strategy according to the current shifting fork position and the requested target gear which are collected by the sensor, obtains the driving current through a table look-up of a characteristic curve of the cylinder, and finally converts the driving current into a PWM driving signal to be sent to the actuator for terminal control so as to drive the gear selection shifting head. The method comprises the steps of carrying out gear selection control identification according to the current shifting fork position and the shifting fork target position to determine gear selection driving force, and obtaining a PWM driving signal according to the gear selection driving force to drive a gear selection shifting head. The problem of current automatic transmission select shift control to have the accuracy low is solved, automatic transmission's reliability can be improved, the security that the car used is increased.
The method further comprises the following steps:
s5: selecting an initial driving force according to the current shift fork position if the gear selection control is recognized as gear selection-gear off control, gear selection-gear up-gear control, or gear selection-gear down-gear control.
S6: and after the work lasts for a set time, acquiring the angular displacement speed and the displacement of the shifting fork, and determining the target displacement difference value of the current shifting fork according to the displacement of the shifting fork.
S7: and selecting a driving force variation gradient according to the shifting fork angular displacement speed and the target displacement difference value, and outputting a gear selection driving force according to the driving force variation gradient.
The method further comprises the following steps:
s8: when the gear selection control is identified as the gear selection-up shift control, the initial driving force is selected to be larger than the spring restoring force of the gear selection lever to push the gear selection lever to move upward.
S9: after the gear selection rod moves, gradually reducing the driving force to ensure that the gear selection rod moves forwards at a constant speed;
s10: and when the gear selection lever reaches the neutral position of the neutral line corresponding to the target position of the shifting fork, setting reverse driving force until the gear selection lever stops.
S11: and setting a driving force toward the requested target gear, moving the select lever toward the requested target gear, and gradually reducing the driving force to stably stop the select lever at the requested target gear.
In practical application, the control process can be divided into 7 stages:
1) a large driving force is set so that the shift select lever is moved.
2) The driving force is controlled to be reduced, and the gear selection displacement is prevented from being pushed too far.
3) The control driving force is slightly increased so that the shift selection displacement is stabilized in the first stage.
4) The control driving force is rapidly increased until the select lever is completely stopped.
5) The control driving force is changed slowly so that the shift select lever is moved again.
6) The driving force is controlled to fall to avoid the gear selection lever from pushing through the target position.
7) The control driving force is changed slowly so that the select lever is stabilized at the target position.
The method further comprises the following steps:
s12: when the gear selection control is identified as the gear selection-down gear control, the initial driving force is selected to be 0, so that the gear selection lever moves down by the spring return force.
S13: after the gear selection rod moves, the driving force is increased step by step, so that the gear selection rod moves forwards at a constant speed.
S14: and when the gear selection lever reaches the neutral position of the neutral line corresponding to the target position of the shifting fork, increasing the driving force to stop the gear selection lever.
S15: and setting the driving force to be 0 again, moving the gear selection rod again, controlling the driving force to slowly increase, and moving the gear selection rod to the requested target gear until the gear selection rod is stably stopped at the requested target gear.
In practical application, when the gear is in a middle position, namely a neutral position, the gear is judged to be currently gear selection-downward gear engagement control through the gear. The initial driving force value is set to be 0, the spring is in a release state in a free state, so that the gear selecting shifting block can be pushed to move downwards, when a selected gear moves away and starts to move, the initial driving force is selected according to the current control shifting fork position, after the gear selecting shifting fork works for a period of time, the driving force change gradient is selected according to the shifting fork angular displacement speed and the target displacement difference, and the gear selecting driving force under the working condition is finally output.
The method further comprises the following steps:
s16: when the gear selection control is identified as a gear selection-off control, the initial driving force is selected to push the gear selection lever to move to the neutral position.
S17: after the gear selection rod moves, the driving force is gradually reduced, so that the gear selection rod moves forwards at a constant speed.
S18: and when the gear selection lever reaches the neutral position of the neutral line corresponding to the target position of the shifting fork, setting reverse driving force until the gear selection lever stops.
Therefore, the invention provides a gear selection control method of an automatic gearbox, which is characterized in that gear selection control identification is carried out according to the current shifting fork position and the shifting fork target position so as to determine the gear selection driving force, and a PWM driving signal is obtained according to the gear selection driving force so as to drive a gear selection shifting block. The problem of current automatic transmission select shift control to have the accuracy low is solved, automatic transmission's reliability can be improved, the security that the car used is increased.
The invention also provides a gear selection control system of the automatic gearbox, which comprises: the first acquisition unit is used for acquiring a current shifting fork position and a requested target gear and determining a shifting fork target position according to the requested target gear;
the gear selection control identification unit is used for carrying out gear selection control identification according to the current shifting fork position and the shifting fork target position so as to determine gear selection driving force;
the second acquisition unit is used for acquiring an electric cylinder characteristic curve and establishing a corresponding table of driving force and driving current according to the electric cylinder characteristic curve;
and the driving unit is used for looking up the corresponding table according to the gear selection driving force so as to obtain expected current, and converting a PWM driving signal according to the expected current and a set duty ratio so as to drive the gear selection shifting head.
Preferably, the method further comprises the following steps:
a driving force selection unit for selecting an initial driving force according to the current shift fork position when the gear selection control is recognized as gear selection-off control, gear selection-up-shift control, or gear selection-down-shift control;
the third acquisition unit is used for acquiring the shifting fork angular displacement speed and shifting fork displacement after the work lasts for the set time, and determining the target displacement difference value of the current shifting fork according to the shifting fork displacement;
and the driving force control unit is used for selecting a driving force change gradient according to the shifting fork angular displacement speed and the target displacement difference value and outputting a gear selection driving force according to the driving force change gradient.
Preferably, the method further comprises the following steps:
an up-shift control unit for selecting an initial driving force greater than a spring restoring force of the select lever to push the select lever to move upward when the select control is identified as a select-up-shift control;
the upward gear control unit also gradually reduces the driving force after the gear selection rod moves so as to ensure that the gear selection rod moves forwards at a constant speed;
the upward gear control unit also sets reverse driving force when the gear selection rod reaches a neutral position of a neutral line corresponding to the target position of the shifting fork until the gear selection rod stops;
the upward engagement control unit further sets a driving force toward the requested target gear, moves the select lever toward the requested target gear, and gradually decreases the driving force to stably stop the select lever at the requested target gear.
Preferably, the method further comprises the following steps:
a down-shift control unit for selecting an initial driving force of 0 to move the select lever downward by a restoring force of a spring when the select control is identified as the select-down-shift control;
the downward gear control unit also increases the driving force step by step after the gear selection rod moves, so that the gear selection rod keeps moving forward at a constant speed;
the downward gear control unit also increases the driving force when the gear selection rod reaches a neutral position of a neutral line corresponding to the target position of the shifting fork, so that the gear selection rod stops;
the down-shift control unit also sets the driving force to 0 again, moves the select lever again, controls the driving force to increase slowly, and moves the select lever to the requested target gear until the select lever is stably stopped at the requested target gear.
Preferably, the method further comprises the following steps:
a gear selection control unit for selecting an initial driving force to push the gear selection lever to move towards a neutral position when the gear selection control is identified as gear selection-gear selection control;
the gear-selecting control unit also gradually reduces the driving force after the gear-selecting rod moves, so that the gear-selecting rod moves forwards at a constant speed;
and the gear-selecting control unit also sets reverse driving force when the gear-selecting rod reaches a neutral position of a neutral line corresponding to the target position of the shifting fork until the gear-selecting rod stops.
Therefore, the invention provides a gear selection control system of an automatic gearbox, which carries out gear selection control identification according to the current shifting fork position and the shifting fork target position so as to determine the gear selection driving force, and acquires a PWM driving signal according to the gear selection driving force so as to drive a gear selection shifting block. The problem of current automatic transmission select the gear shift control to have the accuracy low is solved, automatic transmission's reliability can be improved, the security that increases the car and use.
The construction, features and functions of the present invention have been described in detail with reference to the embodiments shown in the drawings, but the present invention is not limited to the embodiments shown in the drawings, and all equivalent embodiments modified or modified by the spirit and scope of the present invention should be protected without departing from the spirit of the present invention.
Claims (6)
1. A gear selection control method of an automatic gearbox is characterized by comprising the following steps:
acquiring a current shifting fork position and a requested target gear, and determining a shifting fork target position according to the requested target gear;
carrying out gear selection control identification according to the current shifting fork position and the shifting fork target position so as to determine gear selection driving force;
acquiring an electric cylinder characteristic curve, and establishing a corresponding table of driving force and driving current according to the electric cylinder characteristic curve;
looking up the corresponding table according to the gear selection driving force to obtain expected current, and converting a PWM driving signal according to the expected current and a set duty ratio to drive a gear selection shifting head;
selecting an initial driving force according to the current shift fork position if the gear selection control is identified as gear selection-gear picking control, gear selection-gear up-gear control or gear selection-gear down-gear control;
after the work lasts for a set time, acquiring the angular displacement speed and the displacement of the shifting fork, and determining the target displacement difference value of the current shifting fork according to the displacement of the shifting fork;
selecting a driving force variation gradient according to the shifting fork angular displacement speed and the target displacement difference value, and outputting a gear selection driving force according to the driving force variation gradient;
selecting an initial driving force greater than a spring restoring force of the select lever to push the select lever to move upward when the select control is identified as a select-up shift control;
after the gear selecting rod moves, gradually reducing the driving force to ensure that the gear selecting rod moves forwards at a constant speed;
when the gear selecting rod reaches a neutral position corresponding to the target position of the shifting fork, setting reverse driving force until the gear selecting rod stops;
and setting a driving force toward the requested target gear position, moving the select lever toward the requested target gear position, and gradually reducing the driving force to stably stop the select lever at the requested target gear position.
2. The automatic transmission gear selection control method according to claim 1, characterized by further comprising:
when the gear selection control is identified as gear selection-downward gear engagement control, selecting the initial driving force to be 0, and enabling the gear selection rod to move downward under the action of the restoring force of the spring;
after the gear selecting rod moves, gradually increasing the driving force to ensure that the gear selecting rod moves forwards at a constant speed;
when the gear selecting rod reaches a neutral position corresponding to the target position of the shifting fork, increasing the driving force to stop the gear selecting rod;
and setting the driving force to be 0 again, moving the gear selecting rod again, controlling the driving force to slowly increase, and moving the gear selecting rod to the requested target gear until the gear selecting rod is stably stopped at the requested target gear.
3. The automatic transmission gear selection control method according to claim 2, characterized by further comprising:
when the gear selection control is identified as gear selection-gear picking control, selecting initial driving force to push a gear selection rod to move towards a neutral position;
after the gear selecting rod moves, gradually reducing the driving force to ensure that the gear selecting rod moves forwards at a constant speed;
and when the gear selecting rod reaches the neutral position of the neutral line corresponding to the target position of the shifting fork, setting reverse driving force until the gear selecting rod stops.
4. A gear selection control system for an automatic transmission, comprising:
the shifting fork control device comprises a first acquisition unit, a second acquisition unit and a control unit, wherein the first acquisition unit is used for acquiring a current shifting fork position and a requested target gear position and determining a shifting fork target position according to the requested target gear position;
the gear selection control identification unit is used for carrying out gear selection control identification according to the current shifting fork position and the shifting fork target position so as to determine gear selection driving force;
the second acquisition unit is used for acquiring an electric cylinder characteristic curve and establishing a corresponding table of driving force and driving current according to the electric cylinder characteristic curve;
the driving unit is used for looking up the corresponding table according to the gear selection driving force so as to obtain expected current, and converting a PWM driving signal according to the expected current and a set duty ratio so as to drive a gear selection shifting head;
a driving force selection unit for selecting an initial driving force according to the current shift fork position when the gear selection control is recognized as gear selection-gear disengagement control, gear selection-up-gear engagement control, or gear selection-down-gear engagement control;
the third acquisition unit is used for acquiring the shifting fork angular displacement speed and shifting fork displacement after the work lasts for the set time, and determining the target displacement difference value of the current shifting fork according to the shifting fork displacement;
the driving force control unit is used for selecting a driving force change gradient according to the shifting fork angular displacement speed and the target displacement difference value and outputting a gear selection driving force according to the driving force change gradient;
an upward shift control unit for selecting an initial driving force greater than a spring restoring force of the select lever to push the select lever to move upward when the select control is identified as a select-upward shift control;
the upward gear engagement control unit also gradually reduces the driving force after the gear selection rod moves, so that the gear selection rod moves forwards at a constant speed;
the upward gear control unit also sets reverse driving force when the gear selection rod reaches a neutral position corresponding to the target position of the shifting fork until the gear selection rod stops;
the upward engagement control unit further sets a driving force toward the requested target gear position, moves the select lever toward the requested target gear position, and gradually decreases the driving force to stably stop the select lever at the requested target gear position.
5. The automatic transmission gear selection control system according to claim 4, characterized by further comprising:
a down-shift control unit for selecting an initial driving force of 0 to move the select lever downward by a spring return force when the select control is identified as the select-down-shift control;
the downward gear engagement control unit also gradually increases the driving force after the gear selection rod moves so as to ensure that the gear selection rod moves forwards at a constant speed;
the downward gear control unit also increases the driving force when the gear selection rod reaches a neutral position corresponding to the target position of the shifting fork, so that the gear selection rod stops;
the downward shift control unit further sets the driving force to 0 again, moves the select lever again, and controls the driving force to increase slowly, so that the select lever moves toward the requested target gear until the select lever is stably stopped at the requested target gear.
6. The automatic transmission gear selection control system according to claim 5, characterized by further comprising:
the gear-off control unit is used for selecting initial driving force to push the gear selecting rod to move to a neutral position when the gear selecting control is identified as gear selecting-gear-off control;
the gear-off control unit also gradually reduces the driving force after the gear selection rod moves, so that the gear selection rod moves forwards at a constant speed;
and the gear-off control unit also sets reverse driving force until the gear selection rod stops when the gear selection rod reaches a neutral position corresponding to the target position of the shifting fork.
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| US5894208A (en) * | 1995-07-28 | 1999-04-13 | Eaton Corporation | Control for electrically actuated shifting mechanism |
| CN202629053U (en) * | 2012-06-26 | 2012-12-26 | 广东戈兰玛汽车***有限公司 | Electronic control type automated mechanical transmission (AMT) system |
| CN106678355B (en) * | 2017-01-25 | 2018-10-30 | 安徽江淮汽车集团股份有限公司 | Grade control method and system are plucked in a kind of double clutch yokes |
| JP7115339B2 (en) * | 2019-01-28 | 2022-08-09 | 株式会社デンソー | shift range controller |
| CN109707840A (en) * | 2019-01-28 | 2019-05-03 | 汉腾汽车有限公司 | A kind of automobile gear selecting drive control method of AMT speed changer |
| CN109723814A (en) * | 2019-01-28 | 2019-05-07 | 汉腾汽车有限公司 | A kind of shift control method of AMT mechanism |
| CN112524238B (en) * | 2020-12-02 | 2022-05-24 | 安徽江淮汽车集团股份有限公司 | Vehicle control method, vehicle and storage medium |
| CN112392948B (en) * | 2020-12-08 | 2022-02-01 | 安徽江淮汽车集团股份有限公司 | Vehicle power upshift method, TCU and vehicle |
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