CN113803456A - Control method for gear engaging reversing valve of double-clutch automatic transmission - Google Patents
Control method for gear engaging reversing valve of double-clutch automatic transmission Download PDFInfo
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- CN113803456A CN113803456A CN202110870148.0A CN202110870148A CN113803456A CN 113803456 A CN113803456 A CN 113803456A CN 202110870148 A CN202110870148 A CN 202110870148A CN 113803456 A CN113803456 A CN 113803456A
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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
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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
- F16H61/0262—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 hydraulic
- F16H61/0276—Elements specially adapted for hydraulic control units, e.g. valves
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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
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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
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
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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
- F16H2061/0043—Cleaning of hydraulic parts, e.g. removal of an orifice clogging
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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
- F16H2061/0075—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by a particular control method
- F16H2061/0087—Adaptive control, e.g. the control parameters adapted by learning
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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
- F16H2061/0459—Smoothing ratio shift using map for shift parameters, e.g. shift time, slip or pressure gradient, for performing controlled shift transition and adapting shift parameters by learning
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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
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
- F16H2061/1248—Resuming normal operation
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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
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
- F16H2061/1256—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected
- F16H2061/126—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected the failing part is the controller
- F16H2061/1264—Hydraulic parts of the controller, e.g. a sticking valve or clogged channel
Abstract
A control method for a gear engaging reversing valve of a double-clutch automatic transmission comprises the following steps: 1) the shifting fork control system calculates the shifting fork control state; 2) judging the state of a reversing valve corresponding to the control state of the shifting fork according to the control state of the shifting fork; 3) according to the state of the reversing valve judged in the step 2), the reversing valve control system switches the state of the reversing valve; 4) and the reversing valve control system outputs the current state of the reversing valve according to the state switching result of the reversing valve.
Description
Technical Field
The invention relates to the technical field of automobile automatic transmissions, in particular to a control method for a gear engaging reversing valve of a double-clutch automatic transmission.
Background
Because the double-clutch transmission is provided with two sets of power transmission systems, the current driving requirement can be met, and simultaneously, the gear engagement of the next target gear can be completed in advance according to the driving intention, and after the target gear is updated, the hydraulic system or the motor driving system immediately controls the two clutches to complete the switching.
The double-clutch transmission system with the reversing valve is characterized in that a shifting fork is arranged on a hydraulic piston, the gear engaging driving force of the shifting fork is from a transmission hydraulic system, the shifting actions of 4 shifting forks can be controlled through two oil path reversing valves and two pressure electromagnetic valves of the hydraulic system, two oil cavities at two ends of the hydraulic piston of the hydraulic system can be respectively filled with pressure oil, the shifting actions are realized by controlling the piston to move through the hydraulic system, and therefore the shifting fork is driven to move to realize the gear disengaging and gear engaging actions of a synchronizer. In the hydraulic system, the movement of the piston is controlled by two oil path reversing valves and two pressure electromagnetic valves, wherein the reversing valves are used for controlling the on-off of the oil path corresponding to the target shifting fork, the pressure electromagnetic valves control the pressure at two ends of the piston in the state that the oil path of the target piston is opened, and the motion state of the piston is controlled by adjusting the difference value of the pressure at two ends of the piston. Before the gear engaging or disengaging action is executed, the reversing valve is controlled to open the corresponding oil duct, after the oil duct is completely opened, the two pressure electromagnetic valves are controlled to adjust the pressure applied to the two ends of the piston, the motion state of the piston is changed to drive the shifting fork to move, and therefore the gear engaging or disengaging action is completed.
The combination of the directional valves is shown in the following table:
| reversing valve 1 | Reversing valve 2 | Corresponding transmission shaft | Corresponding transmission shifting fork | Corresponding transmission gear |
| Closing device | Closing device | Shaft 1 | Shifting fork 1 | Gear numbers 1, 2 |
| Closing device | Opening device | Shaft 1 | Shifting fork 2 | Gear numbers 3, 4 |
| Opening device | Closing device | Shaft 2 | Shifting fork 3 | Gear numbers 5 and 6 |
| Opening device | Opening device | Shaft 2 | Shifting fork 4 | Gear numbers 7 and 8 |
Because the double-clutch transmission system with the reversing valve needs to control the reversing valve to open the corresponding oil duct before gear shifting, gear shifting can be carried out after the oil duct is opened, the action of the reversing valve needs time, and the problems of gear shifting mistake, gear disorder and the like of the transmission system can be caused if the reversing valve is not in place, so that the double-clutch transmission system with the reversing valve has certain disadvantages in gear shifting response, system stability and reliability.
At present, in order to avoid the defects of a double-clutch transmission system with a reversing valve internationally and domestically, a direct gear shifting system without the reversing valve is adopted, and each shifting fork is directly controlled by a corresponding gear shifting electromagnetic valve; there are hub-type gear shifting systems that use brushless motors, one motor controlling one gear shifting hub that drives 1 or more shift forks. Both of these optimizations are based on hardware system optimizations, and the technical solutions will be changed significantly, and the manufacturing costs will also increase to different degrees. Therefore, there is a need for a directional control method that improves the stability of a dual clutch transmission system without requiring a change in hardware configuration.
Disclosure of Invention
The invention aims to provide a control method of a gear engaging reversing valve of a dual-clutch automatic transmission, aiming at the defects of the prior art, which can improve the switching response speed of the reversing valve, shorten the gear shifting time of the transmission and improve the accuracy, stability and reliability of gear shifting of a dual-clutch transmission system.
The technical scheme of the invention is as follows: a control method for a gear engaging reversing valve of a double-clutch automatic transmission comprises the following steps:
1) the shifting fork control system calculates the shifting fork control state;
2) judging the state of a reversing valve corresponding to the control state of the shifting fork according to the control state of the shifting fork;
3) according to the state of the reversing valve judged in the step 2), the reversing valve control system switches the state of the reversing valve;
4) and the reversing valve control system outputs the current state of the reversing valve according to the state switching result of the reversing valve.
Further, the shifting fork control state in the step 1) comprises a back-empty state, a gear engaging state, a self-learning state, a self-diagnosis state, a self-cleaning state, an idle state and a default state.
Further, the default state has the lowest priority.
Furthermore, when the control state of the shifting fork is a return-to-empty state or a gear engaging state, the reversing valve is switched to a corresponding state according to the position of the shifting fork; when the shifting fork control state is a self-learning state, the reversing valve performs self-learning processing; when the shifting fork control state is a self-diagnosis state, the reversing valve carries out self-diagnosis processing; when the control state of the shifting fork is a self-cleaning state, the reversing valve enters self-cleaning control; when the shifting fork control state is an idle state, preprocessing control of gear up, gear down or holding is carried out on the reversing valve according to driving intention; when the shifting fork control state is the acquiescent state, the reversing valve keeps the original state unchanged.
Further, the reversing valve carries out self-learning processing according to the following steps:
1) the shifting fork control system calculates the working state of the reversing valve according to the position of each shifting fork and outputs the working state of the reversing valve to the reversing valve control system;
2) each shifting fork sequentially executes twice sweeping actions according to a set sequence, and an electric value of each shifting fork corresponding to a gear which is successfully shifted is determined;
3) when all the shifting forks are swept completely and the sweeping result meets the set requirement, outputting the self-learning state as a success state; when the shifting fork is in the sweeping process, the self-learning state is output as an execution state; when the shifting fork is interrupted in the sweeping process or the sweeping result does not meet the requirement, outputting the self-learning state as failure; otherwise, the self-learning state outputs a default state.
Further, the reversing valve carries out self-diagnosis treatment according to the following steps:
1) when one reversing valve cannot be opened, the reversing valve control system outputs an opening request to the reversing valve, if the opening request maintaining time reaches a set value, the reversing valve control system outputs a high-frequency switch switching request to the reversing valve, and the reversing valve is opened through a high-frequency switch;
2) when one reversing valve cannot be closed, the reversing valve control system outputs a closing request to the reversing valve, and if the closing request maintaining time reaches a set value, the reversing valve control system outputs a high-frequency switch switching request to the reversing valve, and the reversing valve is closed through a high-frequency switch.
Further, the reversing valve carries out self-cleaning control according to the following steps:
1) judging whether to execute self-cleaning control or not according to the current shifting fork state and whether the shifting fork has an execution pressure request or not;
2) if the current shifting fork has an execution pressure request, the self-cleaning control is not executed, the state of the reversing valve is kept to be output in the original state, otherwise, a self-cleaning mode is selected according to the state of the reversing valve, the opening and closing states of the reversing valve are repeatedly switched, and the next self-cleaning mode is started after the self-cleaning mode is completed.
Further, the reversing valve control system performs preprocessing control according to the following steps:
1) judging whether to execute the preprocessing control of the commutator according to the current shifting fork state and whether the shifting fork has an execution pressure request;
2) if the shifting fork has an execution pressure request at present, the preprocessing of the reversing valve is not executed, the state of the reversing valve is kept to be output in the original state, and otherwise, the driving intention is calculated;
3) calculating an upshift vehicle speed and a downshift vehicle speed according to the current gear and the gear shift map, and if the current vehicle speed is higher than the upshift vehicle speed and the driving intention is an upshift, sending an intention upshift instruction; if the current vehicle speed is lower than the downshift vehicle speed and the driving intention is downshift, sending an intention downshift instruction; if the current vehicle speed is between the upshift vehicle speed and the downshift vehicle speed, the operation intention of the driver is acceleration, and if the current vehicle speed is greater than the lowest upshift vehicle speed, the driving intention is upshift, and an intention upshift instruction is sent; if the current vehicle speed is between the upshift vehicle speed and the downshift vehicle speed, the operation intention of the driver is deceleration, and if the current vehicle speed is lower than the highest downshift vehicle speed, the driving intention is downshift, and an intention downshift instruction is sent; otherwise, recognizing that no driving intention changes, and not sending an intention instruction;
4) calculating an intended gear according to the driving intention, wherein when the driving intention is an upshift, the intended gear = an actual gear + 1; when the driving intent is a downshift, the intended gear = actual gear-1;
5) and calculating the state of the reversing valve according to the combination of the intended gear and the state of the synchronizer, and sending a corresponding state switching instruction to the reversing valve.
Further, the reversing valve performs state switching according to the following steps:
1) judging whether the state of the reversing valve needs to be switched or not according to the current state of the reversing valve and the target state of the reversing valve, if not, keeping the original output state of the reversing valve, and finishing the switching of the reversing valve; if the switching is needed, the state switching of the reversing valve is carried out through PWM control;
2) and if the target state of the reversing valve is not changed, the verification is passed, and the target state of the reversing valve is output, otherwise, the first step is returned to judge whether the state of the reversing valve needs to be switched.
Further, the PWM control switches the state of the reversing valve twice.
The beneficial effects of adopting the above technical scheme are:
1. the control method judges the gear shifting trend of the dual-clutch automatic transmission by identifying the driving intention, identifies a possible next gear, and controls the action of the reversing valve in advance by using the idle time so as to shorten the gear shifting time and improve the gear shifting response of a transmission system.
2. According to the control method, the self-cleaning control is carried out on the reversing valve by utilizing the idle time, the switching failure of the reversing valve switch caused by long-time non-opening of the reversing valve or the pollution of oil products of the transmission in the use process is avoided, the problem of gear disorder is solved, and the gear shifting accuracy of a transmission system and the reliability of the system can be improved.
3. According to the control method, the reversing valve is subjected to self-diagnosis control, and when the reversing valve has a clamping failure, the function of the reversing valve can be recovered as far as possible, so that the limping home capability of the transmission system is improved.
4. The control method can avoid the problem of disorder gear caused by wrong state switching by judging and confirming the state switching of the reversing valve, thereby improving the accuracy of gear shifting of the transmission system and the stability of the system.
The invention is further described with reference to the drawings and the specific embodiments in the following description.
Drawings
FIG. 1 is a flow chart of the main control for the control of the diverter valve of the present invention;
FIG. 2 is a flow chart of the self-cleaning control of the diverter valve of the present invention;
FIG. 3 is a flow chart of the preconditioning control of the diverter valve of the present invention;
fig. 4 is a flow chart of the state switching control of the reversing valve of the invention.
Detailed Description
Referring to fig. 1-4, an embodiment of a dual clutch automatic transmission shift selector valve control method includes the steps of:
1) and the shifting fork control system calculates the shifting fork control state, and the reversing valve control system switches the state of the reversing valve according to the shifting fork control state.
2) Judging whether the current shifting fork control state is a return-to-empty state or not according to the target gear and the current shifting fork gear, if the target gear is empty and the current shifting fork gear is not in a vacant position or the target gear is not empty and the shifting fork corresponding to the current gear and the shifting fork corresponding to the target gear are coaxial but not the same, judging that the shifting fork control state is the return-to-empty state, and calculating the shifting fork required to be returned to empty according to the target gear and the current shifting fork gear state;
if the target gear is empty and the current shifting fork gear is not in the empty position, the shifting fork corresponding to the current gear needs to be returned to the empty position, and the reversing valve is switched to the corresponding state according to the position of the shifting fork; if the target gear is not empty, and the shifting fork corresponding to the current gear and the shifting fork corresponding to the target gear are coaxial but not the same, the shifting fork corresponding to the current gear needs to be emptied, and an opening or closing instruction is sent to each reversing valve according to the position of the shifting fork, so that each reversing valve is switched to a corresponding state, namely, whether another shifting fork coaxial with the target gear needs to be emptied or not is detected, two gears are prevented from being coaxially hung, and the transmission is prevented from being locked. For example: 1, 3, 5 and 7 gears are arranged on an odd shaft of the transmission, and when the target gear is 1 gear, and the control state of the shifting fork is that 5 gears are on the odd shaft, the shifting fork needs to be returned to the neutral position firstly.
Otherwise, judging whether the shifting fork control state is the gear engaging state.
3) Judging whether the shifting fork control state is a shifting state or not according to the target gear and the coaxial gear of the target gear, if the target gear is not empty, the gear coaxial with the target gear is empty, or the gear coaxial with the target gear but different shifting forks are empty, judging that the shifting fork control state is the shifting state, calculating the shifting fork required to be shifted according to the target gear and the shifting fork control state, namely the shifting fork corresponding to the target gear needs to be shifted, and sending an opening or closing instruction to each reversing valve according to the position of the shifting fork to enable each reversing valve to be switched to a corresponding state; otherwise, judging whether the shifting fork control state is a self-learning state.
4) And if the target gear is empty and the shifting fork self-learning function is in an activated state, the shifting fork control state is a self-learning state, at the moment, the reversing valve performs self-learning processing, and otherwise, whether the shifting fork control state is a self-diagnosis state is judged.
The reversing valve self-learns according to the following steps:
4-1) calculating the working state of the reversing valve by the shifting fork control system according to the position of each shifting fork, and outputting the working state of the reversing valve to the reversing valve control system;
4-2) the shifting forks sequentially execute sweeping actions according to a set sequence, and each shifting fork respectively executes twice sweeping actions, so that the electric value of each shifting fork corresponding to a gear which is successfully shifted is determined;
4-3) when all the shifting forks are completely swept and the sweeping result meets the set requirement, the self-learning module outputs the self-learning state and outputs the self-learning state as a success state; when the shifting fork is in the sweeping process, the self-learning module outputs a self-learning state as an execution state; when the shifting fork is interrupted in the sweeping process or the sweeping result does not meet the requirement or the sweeping exceeds the time limit, the self-learning module outputs the self-learning state as failure; otherwise, the self-learning state outputs a default state. The self-learning sweep may serve the purpose of eliminating part manufacturing and assembly variations.
5) If the shifting fork control system receives a fault substitution input value sent by the fault processing module and the fault substitution meets the requirement, the shifting fork control state is a self-diagnosis state, at the moment, the reversing valve carries out self-diagnosis processing, and if not, whether the shifting fork control state is a self-cleaning state or not is judged.
The reversing valve carries out self-diagnosis treatment according to the following steps:
5-1) presetting the opening maintaining time, the closing maintaining time and the state maintaining time of the high-frequency switch switching request;
5-2) when one reversing valve can not be opened, the reversing valve control system outputs an opening request to the reversing valve, if the opening request maintaining time reaches a set value, the reversing valve control system outputs a high-frequency switch switching request to the reversing valve, and the reversing valve is opened through the high-frequency switch.
5-3) when one reversing valve can not be closed, the reversing valve control system outputs a closing request to the reversing valve, if the closing request maintaining time reaches a set value, the reversing valve control system outputs a high-frequency switch switching request to the reversing valve, and the reversing valve is closed through the high-frequency switch.
When the reversing valve has a clamping failure, the function of the reversing valve can be recovered as much as possible through the high-frequency switch.
6) If the maintaining time of the closing state of the reversing valve exceeds a set value or the maintaining time of the opening state of the reversing valve exceeds a set value or the time of the reversing valve from the last self-cleaning exceeds a set value, the control state of the shifting fork is the self-cleaning state, at the moment, the reversing valve enters self-cleaning control, and if not, whether the control state of the shifting fork is the idle state is judged.
The reversing valve carries out self-cleaning control according to steps, and the reversing valve keeps the flexibility of state switching by repeatedly switching the closing or opening state of the reversing valve:
6-1) judging whether to execute self-cleaning control according to the current shifting fork control state, whether the shifting fork has an execution pressure request, and whether the current shifting fork control state and the maintenance time of the execution pressure request meet the set requirements;
6-2) if the current shifting fork has an execution pressure request, the self-cleaning control is not executed, the state of the reversing valve is kept to be output in the original state, and otherwise, self-cleaning is executed according to the state of the reversing valve;
6-3) when the maintaining time of the closing state of the reversing valve exceeds a set value, starting a self-cleaning mode 1, repeatedly executing a switching request by the reversing valve, firstly requesting the reversing valve to be opened, enabling the reversing valve to be maintained in an opening state, when the maintaining time of the opening state exceeds a preset time, then requesting the reversing valve to be closed, enabling the reversing valve to be maintained in a closing state, when the maintaining time of the closing state exceeds the preset time, requesting the reversing valve to be opened again, maintaining the opening state, and adding 1 to the self-cleaning times, wherein the current magnitude of the opening and the closing of the reversing valve in the embodiment adopts a software default value;
if the self-cleaning times reach the set value of the mode 1, outputting the control state of the self-cleaning mode 1 as finished, and executing a self-cleaning mode 2; if the cleaning times do not reach the set value of the mode 1, outputting the control state of the self-cleaning mode 1 as the execution process, and continuously executing the self-cleaning mode 1;
6-4) when the maintaining time of the opening state of the reversing valve exceeds a set value, starting a self-cleaning mode 2, repeatedly executing a switch request by the reversing valve, firstly requesting to switch off the switching valve and keeping the reversing valve in a closed state, when the maintaining time of the closed state exceeds the preset time, then requesting to open the reversing valve and keeping the reversing valve in the open state, when the maintaining time of the open state exceeds the preset time, requesting to close the reversing valve again and keeping the closed state, and simultaneously adding 1 to the self-cleaning times, wherein the current magnitude of the opening and closing of the reversing valve in the embodiment adopts a software default value;
if the self-cleaning times reach the set value of the mode 2, outputting the control state of the self-cleaning mode 2 as finished, and executing a self-cleaning mode N; if the cleaning times do not reach the set value of the mode 2, outputting the control state of the self-cleaning mode 2 as the execution process, and continuously executing the self-cleaning mode 2;
6-5) when the time from the last self-cleaning of the reversing valve exceeds a set value, starting a self-cleaning mode N, repeatedly switching the reversing valve according to the set opening time and the set closing time in the mode, adding 1 to the self-cleaning frequency when finishing one-time switching request or switching-off request, and adjusting the opening and closing current of the reversing valve according to the state switching frequency in the repeated process of the reversing valve to ensure the self-cleaning effect of the reversing valve;
if the self-cleaning times reach the set value of the mode N, outputting the control state of the self-cleaning mode N to be finished, and starting the next self-cleaning mode; if the self-cleaning times do not reach the set value of the mode N, the control state of the self-cleaning mode N is output as the execution, and the self-cleaning mode N is continuously executed.
7) And judging whether the shifting fork control state is an idle state or not according to the target gear and the coaxial gear of the target gear, if the target gear is empty and the shifting fork gear coaxial with the target gear is in a vacancy, or the target gear is not empty, the current gear is the same as the target gear and the non-coaxial gear is empty, the shifting fork control state is the idle state, and at the moment, the reversing valve control system carries out pretreatment control of gear up, gear down or maintenance on the reversing valve according to the driving intention, otherwise, the shifting fork control state enters a default state.
The reversing valve control system carries out pretreatment control according to the following steps:
7-1) judging whether to execute the preprocessing control of the commutator according to the current shifting fork control state, whether the shifting fork has an execution pressure request, and whether the current shifting fork control state and the maintenance time of the execution pressure request meet the set requirements;
7-2) if the current shifting fork has an execution pressure request, namely when the shifting fork needing to be returned to the air or put into gear exists in the system, the preprocessing of the reversing valve is not executed, the state of the reversing valve is kept to be output in the original state, and otherwise, the driving intention is calculated;
7-3) when the handle of the vehicle is in a D mode, calculating an upshift vehicle speed and a downshift vehicle speed according to the current gear and the gear shift map, and if the current vehicle speed is higher than the upshift vehicle speed and the driving intention is an upshift, sending an intention upshift instruction; if the current vehicle speed is lower than the downshift vehicle speed and the driving intention is downshift, sending an intention downshift instruction; if the current vehicle speed is between the upshift vehicle speed and the downshift vehicle speed, the operation intention of the driver is acceleration, and if the current vehicle speed is greater than the lowest upshift vehicle speed, the driving intention is upshift, and an intention upshift instruction is sent; if the current vehicle speed is between the upshift vehicle speed and the downshift vehicle speed, the operation intention of the driver is deceleration, and if the current vehicle speed is lower than the highest downshift vehicle speed, the driving intention is downshift, and an intention downshift instruction is sent; otherwise, recognizing that no driving intention changes, and not sending an intention instruction;
7-4) calculating an intended gear from the driving intention, when the driving intention is an upshift, the intended gear = actual gear + 1; when the driving intent is a downshift, the intended gear = actual gear-1;
7-5) calculating the state of the reversing valve according to the combination of the intended gear and the state of the synchronizer, sending a corresponding state switching instruction to the reversing valve, and outputting an opening or closing instruction to the reversing valve according to the position of a shifting fork corresponding to the intended gear when the intended gear is not empty and the gear coaxial with the intended gear is empty, so that the reversing valve is switched to the corresponding state; and when the intention gear is empty, keeping the corresponding opening or closing instruction output of the current reversing valve.
8) When the shifting fork control state is in the default state, the reversing valve keeps the original state unchanged and outputs a state keeping instruction.
9) And the reversing valve control system outputs the current state of the reversing valve according to the state switching result of the reversing valve.
When the reversing valve receives an opening or closing instruction, the state switching is carried out according to the following steps:
firstly, determining a target reversing valve and a target state of the reversing valve according to a shifting fork control state;
secondly, the target reversing valve judges whether the state of the target reversing valve needs to be switched or not according to the current state and the target state of the reversing valve, if the current state is the same as the target state, the state of the target reversing valve does not need to be switched, the reversing valve keeps the original output state, and the state switching of the reversing valve is completed; if the current state is different from the target state, the target reversing valve state needs to be switched, and the reversing valve state is switched through PWM control;
thirdly, according to the target state of the target reversing valve, PWM controls the target reversing valve to carry out switch switching twice, so that oil path switching errors caused by clamping stagnation of the reversing valve are prevented, the opening maintaining time and the closing maintaining time of the reversing valve are preset, the opening and closing request currents of the reversing valve are system default values, when the reversing valve completes one switch switching, the switching frequency is increased by 1, when the switching frequency reaches twice, the PWM control is completed, otherwise, the state switching is continued;
and fourthly, checking whether the state switching of the reversing valve is completed or not according to whether the target state of the target reversing valve is changed or not, if the target state of the reversing valve is not changed, the checking is passed, the state switching of the target reversing valve is completed, and the target reversing valve outputs the target state, otherwise, returning to the first step to judge whether the state of the target reversing valve needs to be switched or not.
The control method sets six priority sequences of return, gear engagement, self-learning, self-diagnosis, self-cleaning and idle for the shifting fork control state, sequentially detects the shifting fork control state according to the priority sequence, can avoid the problem of gear disorder caused by state switching errors by judging and confirming the switching of the state of the reversing valve, and can also prevent the gear disorder caused by the change of the target state of the target reversing valve in the state switching process, thereby improving the accuracy of gear shifting of the transmission system and the stability of the system.
In addition, the control method judges the gear shifting trend of the dual-clutch automatic transmission by identifying the driving intention, identifies a possible next gear, and controls the action of the reversing valve in advance by using the idle time so as to shorten the gear shifting time and improve the gear shifting response of a transmission system. Meanwhile, the control method achieves the purpose of self cleaning by repeatedly switching the switch of the reversing valve by using the idle time, avoids the switching failure of the reversing valve due to long-time non-opening of the reversing valve or the pollution of oil products of the transmission in the use process, further solves the problem of gear disorder, and can improve the accuracy of gear shifting of a transmission system and the reliability of the system. The control method can recover the function of the reversing valve as far as possible through the high-frequency switch by performing self-diagnosis control on the reversing valve when the reversing valve has a clamping failure, so that the limp home capability of the transmission system is improved.
Claims (10)
1. A control method for a gear engaging reversing valve of a double-clutch automatic transmission is characterized by comprising the following steps:
1) the shifting fork control system calculates the shifting fork control state;
2) judging the state of a reversing valve corresponding to the control state of the shifting fork according to the control state of the shifting fork;
3) according to the state of the reversing valve judged in the step 2), the reversing valve control system switches the state of the reversing valve;
4) and the reversing valve control system outputs the current state of the reversing valve according to the state switching result of the reversing valve.
2. The dual clutch automatic transmission shift selector valve control method of claim 1, wherein: the shifting fork control states in the step 1) comprise a return-to-empty state, a gear engaging state, a self-learning state, a self-diagnosis state, a self-cleaning state, an idle state and a default state.
3. The dual clutch automatic transmission shift selector valve control method of claim 2, wherein: the default state has the lowest priority.
4. The dual clutch automatic transmission shift selector valve control method of claim 2, wherein: when the control state of the shifting fork is a return-to-empty state or a gear engaging state, the reversing valve is switched to a corresponding state according to the position of the shifting fork; when the shifting fork control state is a self-learning state, the reversing valve performs self-learning processing; when the shifting fork control state is a self-diagnosis state, the reversing valve carries out self-diagnosis processing; when the control state of the shifting fork is a self-cleaning state, the reversing valve enters self-cleaning control; when the shifting fork control state is an idle state, preprocessing control of gear up, gear down or holding is carried out on the reversing valve according to driving intention; when the shifting fork control state is the acquiescent state, the reversing valve keeps the original state unchanged.
5. The dual clutch automatic transmission shift selector valve control method of claim 4, wherein: the reversing valve carries out self-learning processing according to the following steps:
1) the shifting fork control system calculates the working state of the reversing valve according to the position of each shifting fork and outputs the working state of the reversing valve to the reversing valve control system;
2) each shifting fork sequentially executes twice sweeping actions according to a set sequence, and an electric value of each shifting fork corresponding to a gear which is successfully shifted is determined;
3) when all the shifting forks are swept completely and the sweeping result meets the set requirement, outputting the self-learning state as a success state; when the shifting fork is in the sweeping process, the self-learning state is output as an execution state; when the shifting fork is interrupted in the sweeping process or the sweeping result does not meet the requirement, outputting the self-learning state as failure; otherwise, the self-learning state outputs a default state.
6. The dual clutch automatic transmission shift selector valve control method of claim 4, wherein: the reversing valve carries out self-diagnosis treatment according to the following steps:
1) when one reversing valve cannot be opened, the reversing valve control system outputs an opening request to the reversing valve, if the opening request maintaining time reaches a set value, the reversing valve control system outputs a high-frequency switch switching request to the reversing valve, and the reversing valve is opened through a high-frequency switch;
2) when one reversing valve cannot be closed, the reversing valve control system outputs a closing request to the reversing valve, and if the closing request maintaining time reaches a set value, the reversing valve control system outputs a high-frequency switch switching request to the reversing valve, and the reversing valve is closed through a high-frequency switch.
7. The dual clutch automatic transmission shift selector valve control method of claim 4, wherein: the reversing valve carries out self-cleaning control according to the following steps:
1) judging whether to execute self-cleaning control or not according to the current shifting fork state and whether the shifting fork has an execution pressure request or not;
2) if the current shifting fork has an execution pressure request, the self-cleaning control is not executed, the state of the reversing valve is kept to be output in the original state, otherwise, a self-cleaning mode is selected according to the state of the reversing valve, the opening and closing states of the reversing valve are repeatedly switched, and the next self-cleaning mode is started after the self-cleaning mode is completed.
8. The dual clutch automatic transmission shift selector valve control method of claim 4, wherein: the reversing valve control system carries out pretreatment control according to the following steps:
1) judging whether to execute the preprocessing control of the commutator according to the current shifting fork state and whether the shifting fork has an execution pressure request;
2) if the shifting fork has an execution pressure request at present, the preprocessing of the reversing valve is not executed, the state of the reversing valve is kept to be output in the original state, and otherwise, the driving intention is calculated;
3) calculating an upshift vehicle speed and a downshift vehicle speed according to the current gear and the gear shift map, and if the current vehicle speed is higher than the upshift vehicle speed and the driving intention is an upshift, sending an intention upshift instruction; if the current vehicle speed is lower than the downshift vehicle speed and the driving intention is downshift, sending an intention downshift instruction; if the current vehicle speed is between the upshift vehicle speed and the downshift vehicle speed, the operation intention of the driver is acceleration, and if the current vehicle speed is greater than the lowest upshift vehicle speed, the driving intention is upshift, and an intention upshift instruction is sent; if the current vehicle speed is between the upshift vehicle speed and the downshift vehicle speed, the operation intention of the driver is deceleration, and if the current vehicle speed is lower than the highest downshift vehicle speed, the driving intention is downshift, and an intention downshift instruction is sent; otherwise, recognizing that no driving intention changes, and not sending an intention instruction;
4) calculating an intended gear according to the driving intention, wherein when the driving intention is an upshift, the intended gear = an actual gear + 1; when the driving intent is a downshift, the intended gear = actual gear-1;
5) and calculating the state of the reversing valve according to the combination of the intended gear and the state of the synchronizer, and sending a corresponding state switching instruction to the reversing valve.
9. The dual clutch automatic transmission shift selector valve control method of claim 1, wherein: the reversing valve is switched in state according to the following steps:
1) judging whether the state of the reversing valve needs to be switched or not according to the current state of the reversing valve and the target state of the reversing valve, if not, keeping the original output state of the reversing valve, and finishing the switching of the reversing valve; if the switching is needed, the state switching of the reversing valve is carried out through PWM control;
2) and if the target state of the reversing valve is not changed, the verification is passed, and the target state of the reversing valve is output, otherwise, the first step is returned to judge whether the state of the reversing valve needs to be switched.
10. The dual clutch automatic transmission shift selector valve control method of claim 9, wherein: the PWM control switches the state of the reversing valve twice.
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