CN111306293A - Synchronizer gear shifting pneumatic control method based on switch valve - Google Patents
Synchronizer gear shifting pneumatic control method based on switch valve Download PDFInfo
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- CN111306293A CN111306293A CN202010122195.2A CN202010122195A CN111306293A CN 111306293 A CN111306293 A CN 111306293A CN 202010122195 A CN202010122195 A CN 202010122195A CN 111306293 A CN111306293 A CN 111306293A
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- gear
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- shifting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/04—Smoothing ratio shift
- F16H61/0403—Synchronisation before shifting
Abstract
The invention provides a synchronizer gear-shifting pneumatic control method based on a switch valve, which divides a synchronizer gear-shifting process into a gear-disengaging stage, a synchronizing stage, a ring-shifting stage and a gear-entering stage according to the movement position and the movement speed of the synchronizer. The pneumatic buffer control function in the gear-picking stage, the pneumatic buffer control function in the ring-shifting stage and the pneumatic buffer control function in the gear-entering stage are adopted, so that the impact of the synchronizer ring starting to contact is reduced in the gear-shifting process of the synchronizer, the service life of the synchronizer is prolonged, the reliability of the locking function is ensured, the phenomenon of tooth hitting abnormal sound is prevented, the end face impact noise after gear shifting is reduced, and the gear-shifting quality is improved.
Description
Technical Field
The invention belongs to the technical field of automatic transmission control, and particularly relates to a synchronizer gear shifting pneumatic control method based on a switching valve.
Background
Synchronizer shifting is a typical shifting method and is widely applied to automatic transmissions. The synchronizer shifting actuator comprises an electric shifting actuator, a hydraulic shifting actuator and a pneumatic shifting actuator. The pneumatic gear shifting mode has the advantages of low cost, rapid gear shifting action, simple structure and the like, and the pneumatic gear shifting actuator is widely applied to the automatic transmission provided with the synchronizer.
However, the pneumatic control has the defects of large compressibility, strong time lag, strong nonlinearity and the like of compressed air. In the shifting process of the synchronizer, the shifting impact and the shifting noise caused by the pneumatic shifting actuator are large, the shifting quality is reduced, the service life of the synchronizer is reduced, and even the phenomenon of tooth hitting and abnormal sound caused by the failure of the synchronization function of the synchronizer is caused; when the gear shifting of the synchronizer is finished, the movement speed of the synchronizer is high, and high end face impact noise is generated.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a synchronizer gear-shifting pneumatic control method based on a switching valve, so that the service life of the synchronizer is prolonged, the locking function is ensured to be reliable, and the gear-shifting quality is improved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a synchronizer gear-shifting pneumatic control method based on a switching valve comprises the following specific steps:
according to the movement position and the movement speed of the synchronizer, the gear shifting process of the synchronizer is divided into a gear-off stage, a synchronization stage, a ring-shifting stage and a gear-in stage.
Step 1: when the gear shifting process starts, judging whether the transmission meets a reverse air supply gear shifting condition, and when the reverse air supply gear shifting condition is met, performing reverse air supply gear shifting control; when the reverse air supply gear-off condition is not met, forward air supply control is carried out;
step 2: judging whether to enter a synchronization stage, and performing forward air supply control after entering the synchronization stage;
and step 3: judging whether entering a ring shifting stage;
after entering a ring shifting stage, judging whether pneumatic buffering conditions of the ring shifting stage are met; when the pneumatic buffering condition in the gear entering stage is not met, forward air supply control is carried out; when the pneumatic buffering condition of the ring shifting stage is met, carrying out pneumatic buffering ring shifting control; when the shifting ring is overtime, the pneumatic buffering shifting ring control is quitted, and the positive air supply control is carried out;
and 4, step 4: judging whether entering a gear entering stage;
after entering the gear entering stage, judging whether the pneumatic buffering condition of the gear entering stage is met, and performing forward air supply control when the pneumatic buffering condition of the gear entering stage is not met; when the pneumatic buffering condition in the gear entering stage is met, carrying out pneumatic buffering gear entering control, judging whether the gear entering is overtime, and when the gear entering is overtime, carrying out forward air supply control;
and 5: judging whether the gear is in place;
step 6: and (5) delaying gas supply and finishing gear shifting.
Optionally, in step 1, the reverse air supply gear-off condition is as follows: the transmission oil temperature is higher than the reverse air make-up oil temperature, and the reverse air make-up oil temperature is determined as follows: and opening the forward switch valve and closing the reverse switch valve to perform a synchronizer gear shifting action, wherein the movement speed of the synchronizer moving to the synchronous position is higher than the lowest transmission oil temperature corresponding to the allowable movement speed.
Optionally, the reverse air supply gear shifting control in the step 1 is as follows: after the shifting process is started, the forward switching valve is kept open. After the forward opening and closing valve is opened for a certain period of time, the reverse opening and closing valve is opened for a certain period of time and then closed.
Optionally, in the reverse air supply gear shifting control, the time delay for opening the reverse switch valve after the forward switch valve is opened is determined according to different oil temperature intervals of the transmission, and the time threshold for opening the reverse switch valve is determined according to different oil temperature intervals of the transmission.
Optionally, in the reverse air supply gear shifting control, when any one of the following conditions is met, the reverse switch valve is closed:
(1) the opening time of the reverse switch valve is greater than the time threshold value of the reverse opening electromagnetic valve;
(2) the synchronizer movement speed is less than the movement speed threshold
Optionally, in step 3, the condition for entering the ring dialing stage is determined as follows: the synchronizer starts to move from a static state.
Optionally, in step 3, the pneumatic buffer conditions in the ring shifting stage are as follows: the ratio of the residual dial ring displacement to the current synchronizer movement speed is smaller than the response time value of the switch valve.
Optionally, in step 3, the pneumatic buffer dial ring is controlled to close the forward switch valve and open the reverse switch valve
Optionally, in step 4, the pneumatic buffer conditions in the gear shift stage are as follows: the oil temperature of the transmission is higher than that of the pneumatic buffer oil in the gear entering stage. The temperature of the pneumatic buffer oil in the gear entering stage is determined as follows: when the forward switch valve is opened and the reverse switch valve is closed to perform a forward gear movement action, the movement speed of the synchronizer at the gear movement end moment is higher than the lowest oil temperature of the transmission corresponding to the allowable movement speed.
Optionally, in step 4, the pneumatic buffer gear entering control is as follows: the actions of opening the forward switch valve and closing the reverse switch valve for a period of time and closing the forward switch valve and simultaneously opening the reverse switch valve are alternately carried out.
Optionally, in step 6, the delayed gas supply is: and opening the forward switch valve for a period of time, and then closing the forward switch valve, and simultaneously keeping the reverse switch valve closed.
Optionally, in step 2, step 3, and step 4, the forward air supply control is: the forward opening/closing valve is opened and the reverse opening/closing valve is closed.
The beneficial effects are as follows:
firstly, in the gear shifting process of the synchronizer, the impact of the synchronizer ring starting to contact is reduced, the service life of the synchronizer is prolonged, the locking function is reliable, and the phenomenon of gear striking abnormal sound is prevented.
In the gear shifting process of the synchronizer, the end face impact noise after gear shifting is reduced, and the gear shifting quality is improved.
Drawings
FIG. 1 is a flow chart of a switching valve based synchronizer shift pneumatic control method of an embodiment of the present invention
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
According to the moving position and the moving speed of the synchronizer, the gear shifting process of the synchronizer is divided into a gear-off stage, a synchronization stage, a ring-shifting stage and a gear-in stage. The gear-off stage is a gear-shifting process from the beginning of a gear-shifting process to the movement of the synchronizer to a synchronous position; the synchronous stage is a gear shifting stage from the movement of the synchronizer to the synchronous position to the start of the movement of the synchronizer, and in the synchronous stage, the movement of the synchronizer is kept in a stop state after the movement of the synchronizer is stopped; the shifting ring stage is a gear shifting process from the end of the synchronization stage to the complete unlocking of the axial movement of the synchronizer, and the gear entering stage is a gear shifting stage from the end of the shifting ring stage of the synchronizer to the in-place gear entering stage.
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
In one embodiment, as shown in fig. 1, a pneumatic control method for shifting a synchronizer based on a switching valve comprises the following steps:
step 1: when the gear shifting process starts, whether the transmission meets the reverse air supply gear-disengaging condition or not is judged. When the reverse air supply gear shifting condition is met, reverse air supply gear shifting control is carried out; and when the reverse air supply gear-disengaging condition is not met, forward air supply control is carried out.
Step 2: and judging whether to enter a synchronization stage, and performing forward air supply control after entering the synchronization stage.
And step 3: and judging whether to enter a ring shifting stage.
After entering a ring shifting stage, judging whether pneumatic buffering conditions of the ring shifting stage are met; and when the pneumatic buffering condition in the gear entering stage is not met, forward air supply control is performed. When the pneumatic buffering condition of the ring shifting stage is met, carrying out pneumatic buffering ring shifting control; and when the shifting ring is overtime, the pneumatic buffering shifting ring control is withdrawn, and the forward air supply control is carried out.
And 4, step 4: and judging whether to enter a gear entering stage.
And after entering the gear entering stage, judging whether the pneumatic buffering condition of the gear entering stage is met, and performing forward air supply control when the pneumatic buffering condition of the gear entering stage is not met. When the pneumatic buffering condition of the gear entering stage is met, the pneumatic buffering gear entering control is carried out, whether the gear entering is overtime or not is judged, and when the gear entering is overtime, the forward air supply control is carried out.
And 5: and judging whether the gear is in place or not.
Step 6: and (5) delaying gas supply and finishing gear shifting.
In another embodiment, in the step 1, the reverse air supply gear-off condition is as follows: the transmission oil temperature is higher than the reverse air make-up oil temperature, and the reverse air make-up oil temperature is determined as follows: and opening the forward switch valve and closing the reverse switch valve to perform a synchronizer gear shifting action, wherein the movement speed of the synchronizer moving to the synchronous position is higher than the lowest transmission oil temperature corresponding to the allowable movement speed.
In another embodiment, the reverse air supply gear shifting control in step 1 is as follows: after the shifting process is started, the forward switching valve is kept open. After the forward opening and closing valve is opened for a certain period of time, the reverse opening and closing valve is opened for a certain period of time and then closed.
In another embodiment, in the reverse air supply gear shifting control, the time delay for opening the reverse switch valve after the forward switch valve is opened is determined according to different oil temperature intervals of the transmission, and the time threshold for opening the reverse switch valve is determined according to different oil temperature intervals of the transmission.
In another embodiment, in the reverse air supply gear shifting control, when any one of the following conditions is met, the reverse switch valve is closed:
(1) the opening time of the reverse switch valve is greater than the time threshold value of the reverse opening electromagnetic valve;
(2) the synchronizer movement speed is less than the movement speed threshold
In another embodiment, in step 3, the condition for entering the ring dialing stage is determined as follows: the synchronizer starts to move from a static state.
In another embodiment, in the step 4, the pneumatic buffering conditions in the ring pulling stage are as follows: the ratio of the residual dial ring displacement to the current synchronizer movement speed is smaller than the response time value of the switch valve.
In another embodiment, in the step 4, the pneumatic buffer dial ring is controlled to close the forward switch valve and open the reverse switch valve
In another embodiment, in step 6, the pneumatic buffer conditions in the gear shift stage are as follows: the oil temperature of the transmission is higher than that of the pneumatic buffer oil in the gear entering stage. The temperature of the pneumatic buffer oil in the gear entering stage is determined as follows: when the forward switch valve is opened and the reverse switch valve is closed to perform a forward gear movement action, the movement speed of the synchronizer at the gear movement end moment is higher than the lowest oil temperature of the transmission corresponding to the allowable movement speed.
In another embodiment, in step 6, the pneumatic buffer gear-in control is: the actions of opening the forward switch valve and closing the reverse switch valve for a period of time and closing the forward switch valve and simultaneously opening the reverse switch valve are alternately carried out.
In another embodiment, in step 8, the time-lapse gas supply is: and opening the forward switch valve for a period of time, and then closing the forward switch valve, and simultaneously keeping the reverse switch valve closed.
In another embodiment, in the step 2, the step 4, and the step 6, the forward air supply control is: the forward opening/closing valve is opened and the reverse opening/closing valve is closed.
In the embodiment, the impact of the synchronizer ring starting to contact is reduced, the phenomenon of tooth hitting abnormal sound is avoided, and the end face impact noise after gear shifting is finished is reduced.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A synchronizer gear-shifting pneumatic control method based on a switching valve is characterized by comprising the following specific steps:
step 1: when the gear shifting process starts, judging whether the transmission meets the reverse air supply gear-disengaging condition or not;
when the reverse air supply gear shifting condition is met, reverse air supply gear shifting control is carried out; when the reverse air supply gear-off condition is not met, forward air supply control is carried out;
step 2: judging whether to enter a synchronization stage, and performing forward air supply control after entering the synchronization stage;
and step 3: judging whether entering a ring shifting stage;
after entering a ring shifting stage, judging whether pneumatic buffering conditions of the ring shifting stage are met; when the pneumatic buffering condition in the gear entering stage is not met, forward air supply control is carried out; when the pneumatic buffering condition of the ring shifting stage is met, carrying out pneumatic buffering ring shifting control; when the shifting ring is overtime, the pneumatic buffering shifting ring control is quitted, and the positive air supply control is carried out;
and 4, step 4: judging whether entering a gear entering stage;
after entering the gear entering stage, judging whether the pneumatic buffering condition of the gear entering stage is met, and performing forward air supply control when the pneumatic buffering condition of the gear entering stage is not met; when the pneumatic buffering condition in the gear entering stage is met, carrying out pneumatic buffering gear entering control, judging whether the gear entering is overtime, and when the gear entering is overtime, carrying out forward air supply control;
and 5: judging whether the gear is in place;
step 6: and (5) delaying gas supply and finishing gear shifting.
2. A switching valve based synchronizer shift pneumatic control method according to claim 1, characterized in that: the reverse air supplementing gear-off condition in the step 1 is as follows: the transmission oil temperature is higher than the reverse air make-up oil temperature, and the reverse air make-up oil temperature is determined as follows: and opening the forward switch valve and closing the reverse switch valve to perform a synchronizer gear shifting action, wherein the movement speed of the synchronizer moving to the synchronous position is higher than the lowest transmission oil temperature corresponding to the allowable movement speed.
3. A switching valve based synchronizer shift pneumatic control method according to claim 1, characterized in that: the reverse air supply gear-off control in the step 1 is as follows: after the gear shifting process is started, keeping opening a forward switch valve; after the forward opening and closing valve is opened for a certain period of time, the reverse opening and closing valve is opened for a certain period of time and then closed.
4. A switching valve based synchronizer shift pneumatic control method according to claim 1, characterized in that: in the reverse air supply gear-shifting control in the step 1, the time delay for opening the reverse switch valve after the forward switch valve is opened is determined according to different oil temperature intervals of the transmission, and the time threshold for opening the reverse switch valve is determined according to different oil temperature intervals of the transmission.
5. A switching valve based synchronizer shift pneumatic control method according to claim 4, characterized in that: in reverse tonifying qi picking off the fender control, when satisfying following arbitrary condition, close reverse ooff valve:
(1) the opening time of the reverse switch valve is greater than the time threshold value of the reverse opening electromagnetic valve;
(2) the synchronizer movement speed is less than the movement speed threshold.
6. A switching valve based synchronizer shift pneumatic control method according to claim 1, characterized in that: the conditions for judging entering the ring dialing stage in the step 3 are as follows: the synchronizer starts to move from a static state.
7. A switching valve based synchronizer shift pneumatic control method according to claim 1, characterized in that: the pneumatic buffering conditions in the ring pulling stage in the step 3 are as follows: the ratio of the residual dial ring displacement to the current synchronizer movement speed is smaller than the response time value of the switch valve.
8. A switching valve based synchronizer shift pneumatic control method according to claim 1, characterized in that: and 3, controlling the pneumatic buffer dial ring to close the forward switch valve and open the reverse switch valve.
9. A switching valve based synchronizer shift pneumatic control method according to claim 1, characterized in that: the pneumatic buffering conditions in the gear-entering stage in the step 4 are as follows: the oil temperature of the transmission is higher than that of the pneumatic buffer oil in the gear entering stage. The temperature of the pneumatic buffer oil in the gear entering stage is determined as follows: when the forward switch valve is opened and the reverse switch valve is closed to perform the forward shift action, the movement speed of the synchronizer at the shift ending moment is higher than the lowest oil temperature of the transmission corresponding to the allowable movement speed; the pneumatic buffer gear-in control is as follows: the actions of opening the forward switch valve and closing the reverse switch valve for a period of time and closing the forward switch valve and simultaneously opening the reverse switch valve are alternately carried out.
10. A switching valve based synchronizer shift pneumatic control method according to claim 1, characterized in that: the forward air supply control in the step 2, the step 3 and the step 4 is as follows: the forward opening/closing valve is opened and the reverse opening/closing valve is closed.
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Cited By (1)
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| CN114439927A (en) * | 2022-02-17 | 2022-05-06 | 一汽解放汽车有限公司 | Synchronizer gear shifting control method based on electric actuator |
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