CN110985655B - Control method and device of intermediate shaft brake, vehicle and storage medium - Google Patents
Control method and device of intermediate shaft brake, vehicle and storage medium Download PDFInfo
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- CN110985655B CN110985655B CN201911233561.5A CN201911233561A CN110985655B CN 110985655 B CN110985655 B CN 110985655B CN 201911233561 A CN201911233561 A CN 201911233561A CN 110985655 B CN110985655 B CN 110985655B
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- deceleration rate
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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
- 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
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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
- F16H2061/0218—Calculation or estimation of the available ratio range, i.e. possible gear ratios, e.g. for prompting a driver with a display
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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
- F16H2061/0411—Synchronisation before shifting by control of shaft brakes
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Transmission Device (AREA)
Abstract
The invention discloses a control method and a control device of an intermediate shaft brake, a vehicle and a storage medium, and belongs to the technical field of automatic transmission control, wherein the control method of the intermediate shaft brake comprises the following steps: the method comprises the steps of firstly obtaining oil temperature of a transmission of the automatic transmission, determining an upper limit value of a deceleration rate of an intermediate shaft and a lower limit value of the deceleration rate of the intermediate shaft of the automatic transmission, then periodically detecting the deceleration rate of the intermediate shaft within a first preset time length, sending a closing instruction to an on-off valve of an intermediate shaft brake when the current deceleration rate of the intermediate shaft is greater than the lower limit value of the deceleration rate of the intermediate shaft, and sending an opening instruction to the on-off valve of the intermediate shaft brake when the current deceleration rate of the intermediate shaft is less than or equal to the lower limit value of the deceleration rate of. The invention enables the deceleration rate of the intermediate shaft to be adaptive to the brake release characteristic, and can also compensate the lag of the pneumatic control of the switch valve of the intermediate shaft brake, thereby preventing the occurrence of the over-braking condition and compensating the lag of the pneumatic control of the switch valve of the intermediate shaft brake.
Description
Technical Field
The invention relates to the technical field of automatic transmission control, in particular to a control method and device of an intermediate shaft brake, a vehicle and a storage medium.
Background
The sliding gear sleeve shifting mode is widely applied to Automatic Transmissions (ATM). When the sliding gear sleeve shifts gears, the gears need to be shifted within a proper speed difference range, and when the shifting speed difference is not proper, the sliding gear sleeve shifts gears, so that the problems of large shifting impact, failed shifting, even damage to the sliding gear sleeve and the like can occur.
In the gear-up process of the AMT adopting the sliding gear sleeve gear-shifting mode, the rotating speed of the intermediate shaft is reduced, so that the sliding gear sleeve completes the gear-shifting action under a proper rotating speed difference. In order to shorten the gear shifting time and quickly complete the speed reduction of the intermediate shaft, an intermediate shaft brake which takes a wet friction plate as a braking element and a cylinder as an executing element is widely adopted in an AMT (automated mechanical transmission) adopting a sliding gear sleeve gear shifting mode, and the rotating speed of the intermediate shaft is quickly reduced to a target rotating speed through the braking action of the intermediate shaft brake so as to meet the gear shifting requirement of the sliding gear sleeve.
Because pneumatic control has strong time lag and the friction characteristic of a wet friction plate is complex, when the intermediate shaft deceleration control is carried out, the problem of over braking can occur. When the overbraking problem appears, the sliding gear sleeve shifts gears in the process, the intermediate shaft is decelerated too fast, so that the shifting speed difference is not proper, and the problems of failure in shifting gears or large shifting impact and the like appear.
Disclosure of Invention
The invention aims to provide a control method, a control device, a vehicle and a storage medium of an intermediate shaft brake, which can adapt the deceleration rate of the intermediate shaft to the brake release characteristic, can compensate the lag of the pneumatic control of an on-off valve of the intermediate shaft brake, and can prevent the occurrence of an over-braking condition.
As the conception, the technical scheme adopted by the invention is as follows:
a control method of an intermediate shaft brake, comprising the steps of:
s1, acquiring the transmission oil temperature of the automatic transmission;
s2, determining an upper limit value and a lower limit value of the intermediate shaft deceleration rate of the automatic transmission according to the oil temperature of the transmission and the reference value of the intermediate shaft deceleration rate;
s3, periodically detecting the deceleration rate of the intermediate shaft within a first preset time period, sending a closing instruction to an intermediate shaft brake switch valve when the current deceleration rate of the intermediate shaft is greater than the lower limit value of the deceleration rate of the intermediate shaft, wherein the closing instruction is used for indicating the intermediate shaft brake switch valve to be closed, and sending an opening instruction to the intermediate shaft brake switch valve when the current deceleration rate of the intermediate shaft is less than or equal to the lower limit value of the deceleration rate of the intermediate shaft, and the opening instruction is used for controlling the intermediate shaft brake switch valve to be opened;
s4, judging whether the intermediate shaft deceleration value is larger than or equal to the difference value between the first intermediate shaft rotation speed and the intermediate shaft rotation speed control target value at the moment corresponding to the intermediate shaft deceleration value, if so, executing a step S5, and if not, executing a step S3;
s5, stopping detecting the deceleration rate of the intermediate shaft;
and S6, sending a releasing instruction to the intermediate shaft brake switch valve, wherein the releasing instruction is used for indicating the intermediate shaft brake switch valve to be closed.
Optionally, before step S2, the method further comprises:
s20, acquiring a target value of the intermediate shaft deceleration difference;
and S30, determining an intermediate shaft deceleration rate reference value according to the intermediate shaft deceleration speed difference target value and the transmission oil temperature.
Optionally, after the step S6, the method further includes:
s7, judging whether the brake of the intermediate shaft is released or not, if so, executing a step S8, and if not, executing a step S6;
s8, judging whether the current intermediate shaft rotating speed is less than or equal to the intermediate shaft rotating speed control target value, if so, ending the process, and if not, executing a step S9;
s9, intermittently sending a first fine adjustment instruction and a second fine adjustment instruction to the intermediate shaft brake switch valve within a second preset time length so as to enable the intermediate shaft to decelerate at an intermediate shaft micro deceleration rate, wherein the first fine adjustment instruction is used for indicating the intermediate shaft brake switch valve to be opened, and the second fine adjustment instruction is used for indicating the intermediate shaft brake switch valve to be closed;
and S10, judging whether the middle shaft rotating speed after fine adjustment is less than or equal to the middle shaft rotating speed control target value, if so, ending the process, and if not, executing the step S9.
Optionally, after the step S6, the method further includes:
s11, judging whether the brake of the intermediate shaft is released or not, if so, executing a step S12, and if not, executing a step S6;
s12, judging whether the current intermediate shaft rotating speed is less than or equal to the intermediate shaft rotating speed control target value, if so, ending the process, and if not, executing a step S13;
s13, acquiring a first time length for the rotating speed of a target intermediate shaft to be reduced to the intermediate shaft rotating speed control target value, wherein the target intermediate shaft rotating speed is the rotating speed of the intermediate shaft after a release instruction is sent to the intermediate shaft brake switch valve;
s14, judging whether the first time length is smaller than or equal to a free deceleration time length threshold of the intermediate shaft, if so, ending the process, and if not, executing a step S15;
s15, intermittently sending a first fine adjustment instruction and a second fine adjustment instruction to the intermediate shaft brake switch valve within a second preset time length so as to enable the intermediate shaft to decelerate at an intermediate shaft micro deceleration rate, wherein the first fine adjustment instruction is used for indicating the intermediate shaft brake switch valve to be opened, and the second fine adjustment instruction is used for indicating the intermediate shaft brake switch valve to be closed;
and S16, judging whether the middle shaft rotating speed after fine adjustment is less than or equal to the middle shaft rotating speed control target value, if so, ending the process, and if not, executing the step S15.
Optionally, the first time period is equal to a ratio of a target difference value to a free-fall speed of the intermediate shaft, the target difference value being a difference between the current intermediate shaft rotational speed and the intermediate shaft rotational speed control target value.
Optionally, before the step S4, the method further includes:
when the intermediate shaft brake switch valve is in an open state, determining an intermediate shaft deceleration value according to the transmission oil temperature and the intermediate shaft deceleration rate upper limit value;
and when the intermediate shaft brake switch valve is in a closed state, determining the intermediate shaft deceleration value according to the transmission oil temperature and the current intermediate shaft deceleration rate.
Optionally, the step S20 includes:
s201, obtaining the rotating speed of a starting intermediate shaft;
s202, acquiring a target rotation speed control value of the intermediate shaft;
s203, determining the difference value between the starting intermediate shaft rotating speed and the intermediate shaft rotating speed control target value as an intermediate shaft speed reduction difference target value.
A control device of an intermediate shaft brake, comprising:
the automatic transmission control device comprises a first obtaining module, a second obtaining module and a control module, wherein the first obtaining module is used for obtaining transmission oil temperature of the automatic transmission;
the first determination module is used for determining an upper limit value and a lower limit value of a middle shaft deceleration rate of the automatic transmission according to the transmission oil temperature and a reference value of the middle shaft deceleration rate;
the device comprises a first sending module, a second sending module and a control module, wherein the first sending module is used for periodically detecting the deceleration rate of the intermediate shaft within a first preset time length, sending a closing instruction to an intermediate shaft brake switch valve when the current deceleration rate of the intermediate shaft is greater than the lower limit value of the deceleration rate of the intermediate shaft, the closing instruction being used for indicating the intermediate shaft brake switch valve to be closed, and sending an opening instruction to the intermediate shaft brake switch valve when the current deceleration rate of the intermediate shaft is less than or equal to the lower limit value of the deceleration rate of the intermediate shaft, the opening instruction being used for controlling the intermediate shaft brake switch valve to be;
the first judgment module is used for judging whether the intermediate shaft deceleration value is greater than or equal to the difference value between the first intermediate shaft rotation speed and the intermediate shaft rotation speed control target value at the moment corresponding to the intermediate shaft deceleration value;
the stopping module is used for stopping detecting the deceleration rate of the intermediate shaft;
the second sending module is used for sending a releasing instruction to the intermediate shaft brake switch valve, and the releasing instruction is used for indicating the intermediate shaft brake switch valve to be closed.
A vehicle, comprising:
one or more processors;
storage means for storing one or more programs;
when the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the control method of the intermediate shaft brake described above.
A storage medium, on which a computer program is stored, which, when being executed by a vehicle controller, implements the method of controlling an intermediate shaft brake described above.
The beneficial effects of the invention at least comprise:
in the control method, the device, the vehicle and the storage medium of the intermediate shaft brake provided by the invention, the upper limit value of the deceleration rate of the intermediate shaft and the lower limit value of the deceleration rate of the intermediate shaft are firstly determined, and then the deceleration rate of the intermediate shaft is controlled between the upper limit value of the deceleration rate of the intermediate shaft and the lower limit value of the deceleration rate of the intermediate shaft by controlling the opening and closing of the switch valve of the intermediate shaft brake, so that the deceleration rate of the intermediate shaft can adapt to the brake release characteristic, the lag of the pneumatic control of the switch valve of the intermediate shaft brake can be compensated, the occurrence of the over-braking condition can be further prevented, the rotation rate of the intermediate shaft and the deceleration rate of the intermediate shaft required by the gear shifting of the sliding gear.
In addition, according to the control method, the control device, the vehicle and the storage medium of the intermediate shaft brake, whether the intermediate shaft brake is released or not can be judged firstly, when the intermediate shaft brake is not released and the current intermediate shaft rotating speed is greater than the intermediate shaft rotating speed control target value, the intermediate shaft rotating speed can be gradually adjusted by intermittently sending the first fine adjustment instruction and the second fine adjustment instruction to the intermediate shaft brake switch valve, and therefore the rotating speed of the intermediate shaft can be guaranteed to be lower than the intermediate shaft rotating speed control target value.
In addition, the control method and device of the intermediate shaft brake, the vehicle and the storage medium provided by the invention can determine whether the intermediate shaft rotating speed and the intermediate shaft deceleration rate need to be adjusted or not according to the time length for reducing the intermediate shaft rotating speed to the intermediate shaft rotating speed control target value, so that the efficiency of adjusting the intermediate shaft rotating speed is improved.
Drawings
FIG. 1 is a flow chart of a control method for an intermediate shaft brake according to an embodiment of the invention;
FIG. 2 is a graph showing the relationship between the deceleration rate of the intermediate shaft and time and the relationship between the opening of the brake switch valve of the intermediate shaft and time according to the first embodiment of the present invention;
FIG. 3 is a flow chart of a control method of an intermediate shaft brake according to a second embodiment of the invention;
FIG. 4 is a flow chart of a control method of an intermediate shaft brake provided by a third embodiment of the invention;
FIG. 5 is a schematic structural diagram of a control device of an intermediate shaft brake according to a fourth embodiment of the present invention;
fig. 6 is a schematic structural diagram of a vehicle according to a fifth embodiment of the present invention.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
Example one
The embodiment provides a control method of an intermediate shaft brake, which can reduce the probability of over-braking during the deceleration control of the intermediate shaft.
Fig. 1 is a flowchart of a control method for an intermediate shaft brake according to an embodiment of the present invention, where the embodiment is applicable to an intermediate shaft deceleration control process, and the method can be executed by a control device for the intermediate shaft brake, where the control device can be implemented in software and/or hardware and integrated in a vehicle, and specifically, the method includes the following steps:
and S1, acquiring the transmission oil temperature of the automatic transmission.
When the intermediate shaft brake starts braking, the transmission oil temperature in the automatic transmission can be obtained firstly. The transmission oil temperature may be measured by a temperature measuring device (e.g., a thermometer or a thermocouple) located in the automatic transmission, and the transmission oil temperature measured by the temperature measuring device may be stored in the temperature measuring device or a storage module in the control device of the countershaft brake. At this time, the acquisition module in the control device of the intermediate shaft brake may acquire the transmission oil temperature of the automatic transmission from the temperature measuring device or the storage module.
And S2, determining an upper limit value and a lower limit value of the intermediate shaft deceleration rate of the automatic transmission according to the oil temperature of the transmission and the reference value of the intermediate shaft deceleration rate.
The reference values of the oil temperature of the transmission and the deceleration rate of the intermediate shaft can reflect the range of the deceleration rate which can be borne by a structure (such as the intermediate shaft) in the automatic transmission, so that the upper limit value and the lower limit value of the deceleration rate of the intermediate shaft can be determined according to the obtained reference values of the oil temperature of the transmission and the deceleration rate of the intermediate shaft. The upper limit value of the intermediate shaft deceleration rate is the maximum value of the deceleration rate which can be accepted by the intermediate shaft, and the lower limit value of the intermediate shaft deceleration rate is the minimum value of the deceleration rate which can be structured by the intermediate shaft.
Optionally, before executing step S2, the following steps may also be executed:
and S20, acquiring a target value of the intermediate shaft deceleration difference.
And S30, determining an intermediate shaft deceleration rate reference value according to the intermediate shaft deceleration speed difference target value and the transmission oil temperature.
The reference value of the intermediate shaft deceleration rate is related to the target value of the intermediate shaft deceleration speed difference and the oil temperature of the transmission, namely, the reference value of the intermediate shaft deceleration rate is determined by the target value of the intermediate shaft deceleration speed difference and the oil temperature of the transmission together so as to improve the accuracy of determining the upper limit value of the intermediate shaft deceleration rate and the lower limit value of the intermediate shaft deceleration rate.
Further, the intermediate shaft deceleration difference target value may be obtained by calculation, and specifically, the step S20 includes:
s201, acquiring the rotation speed of the starting intermediate shaft.
The starting intermediate shaft rotational speed is the rotational speed of the intermediate shaft at the time of starting control of the intermediate shaft brake, that is, the rotational speed of the intermediate shaft at the time of starting braking by the intermediate shaft brake.
S202, acquiring a target control value of the rotation speed of the intermediate shaft.
After the start intermediate shaft rotation speed is acquired, the intermediate shaft rotation speed control target value may be acquired. The intermediate shaft rotation speed control target value may be data that is input by a user into a control device of an intermediate shaft brake in advance, and the intermediate shaft rotation speed control target value may be determined according to the performance of the vehicle and the transmission. Alternatively, the intermediate shaft rotational speed control target value may be stored in a storage module of the control device of the intermediate shaft brake. It should be noted that the sequence of step S201 and step S202 may be adjusted according to actual conditions, for example, the target control value of the intermediate shaft rotation speed is obtained first, and then the starting intermediate shaft rotation speed is obtained. Alternatively, the starting intermediate shaft rotation speed and the intermediate shaft rotation speed control target value may be obtained at the same time, which is not limited in this embodiment.
And S203, determining the difference value between the starting intermediate shaft rotating speed and the intermediate shaft rotating speed control target value as an intermediate shaft deceleration difference target value.
S3, periodically detecting the deceleration rate of the intermediate shaft within a first preset time period, sending a closing instruction to the intermediate shaft brake switch valve when the current deceleration rate of the intermediate shaft is greater than the lower limit value of the deceleration rate of the intermediate shaft, wherein the closing instruction is used for indicating the intermediate shaft brake switch valve to be closed, and sending an opening instruction to the intermediate shaft brake switch valve when the current deceleration rate of the intermediate shaft is less than or equal to the lower limit value of the deceleration rate of the intermediate shaft, and the opening instruction is used for controlling the intermediate shaft brake switch valve to be opened.
Wherein, the first preset duration and the period for detecting the deceleration rate of the intermediate shaft can be determined by the user according to requirements. And the period for detecting the deceleration rate of the intermediate shaft is less than a first preset time length. The intermediate shaft deceleration rate can be controlled within a predetermined range formed by the intermediate shaft deceleration rate upper limit value and the intermediate shaft deceleration rate lower limit value by step S3. Alternatively, in order to improve the control accuracy, the period for detecting the deceleration rate of the intermediate shaft may be smaller, which is not limited in the embodiment.
For example, fig. 2 shows a relationship curve of the deceleration rate of the intermediate shaft and time when the intermediate shaft brake starts braking, and a relationship curve of the opening degree of the switching valve of the intermediate shaft brake and time. Where a1 represents the lower limit value of the intermediate shaft deceleration rate, a2 represents the upper limit value of the intermediate shaft deceleration rate, curve B represents the curve of the deceleration rate of the intermediate shaft against time, curve D represents the curve of the opening of the intermediate shaft brake switch valve against time, and the switch valve opening in fig. 2 represents the opening of the intermediate shaft brake switch valve, and represents that the intermediate shaft brake switch valve is open when the switch valve opening is 1 and the intermediate shaft brake switch valve is closed when the switch valve opening is 0.
As shown in fig. 2, at time t1, the intermediate shaft deceleration rate is lower than the intermediate shaft deceleration rate lower limit value a1, and at this time, an on command is sent to the intermediate shaft brake switch valve to control the intermediate shaft brake switch valve to open, so that the intermediate shaft deceleration rate is increased. When the intermediate shaft deceleration rate is higher than or equal to the intermediate shaft deceleration rate lower limit value a1 (e.g., within time t 4), a closing command needs to be sent to the intermediate shaft brake switching valve to control the intermediate shaft brake switching valve to close. It should be noted that, since control time is required from the detection that the intermediate shaft deceleration rate is equal to the intermediate shaft deceleration rate lower limit value a1 to the transmission of the closing command to the intermediate shaft brake on-off valve, when the intermediate shaft deceleration rate is equal to the intermediate shaft deceleration rate lower limit value a1, the intermediate shaft brake on-off valve cannot be closed immediately, but needs to be closed after the delay time t4, that is, the time period for which the intermediate shaft brake on-off valve is opened is t1+ t 4. After the intermediate shaft brake switch valve is closed, the intermediate shaft deceleration rate can be continuously increased for a period of time and then gradually reduced. When the intermediate shaft deceleration rate is detected to be lower than the intermediate shaft deceleration rate lower limit value A1 (for example, within the time t 3), an opening command needs to be sent to the intermediate shaft brake switch valve to open the intermediate shaft brake switch valve, and similarly, a delay time t5 exists in the control process. Within the preset duration, the control process is executed for multiple times, and the deceleration rate of the intermediate shaft can be controlled within the preset range.
And S4, judging whether the intermediate shaft deceleration value is larger than or equal to the difference value between the first intermediate shaft rotation speed and the intermediate shaft rotation speed control target value at the moment corresponding to the intermediate shaft deceleration value, if so, executing a step S5, and if not, continuing to execute a step S3.
Whether the intermediate shaft deceleration value is larger than or equal to the first intermediate shaft deceleration value and the acquisition time of the intermediate shaft deceleration value in the difference value between the first intermediate shaft rotation speed and the intermediate shaft rotation speed control target value at the time corresponding to the intermediate shaft deceleration value are in one-to-one correspondence, namely, the intermediate shaft deceleration value at the first time corresponds to the difference value between the first intermediate shaft rotation speed and the intermediate shaft rotation speed control target value at the first time, so that the control accuracy of the control method of the intermediate shaft brake is improved. The intermediate shaft rotation speed control target value may be manually input into the control device of the intermediate shaft brake by a user, and the intermediate shaft deceleration value may be acquired before the intermediate shaft deceleration value is determined. It should be noted that the intermediate shaft deceleration value may be an intermediate shaft deceleration value at the end of the first preset time period, and accordingly, the first intermediate shaft rotation speed is the rotation speed of the intermediate shaft at the end. For example, if the first preset time period is 5 seconds, the starting time of the first preset time period is 3 seconds, at this time, the intermediate shaft deceleration value is the intermediate shaft deceleration value at the 8 th second, and the first intermediate shaft deceleration is the rotation speed of the intermediate shaft at the 8 th second.
In addition, if the intermediate shaft deceleration value is less than the difference between the first intermediate shaft rotational speed and the intermediate shaft rotational speed control target value, it is indicated that the intermediate shaft deceleration value does not reach the condition for ending the intermediate shaft brake control, at this time, the intermediate shaft deceleration rate needs to be controlled by the intermediate shaft brake switching valve continuously, and then it is determined again whether the adjusted intermediate shaft deceleration value is greater than or equal to the difference between the adjusted first intermediate shaft rotational speed and the intermediate shaft rotational speed control target value until the adjusted intermediate shaft deceleration value is greater than or equal to the difference between the adjusted first intermediate shaft rotational speed and the intermediate shaft rotational speed control target value, at this time, step S5 may be executed.
Optionally, in this embodiment, before step S4, the method further includes:
after the first preset time period is ended, whether the intermediate shaft brake switch valve is in an open state or a closed state is judged, and when the intermediate shaft brake switch valve is in the open state, the intermediate shaft deceleration value in the step S4 can be determined according to the oil temperature of the transmission and the upper limit value of the intermediate shaft deceleration rate. When the intermediate shaft brake switch valve is in a closed state, the intermediate shaft deceleration value can be determined according to the oil temperature of the transmission and the current intermediate shaft deceleration rate.
And S5, stopping detecting the deceleration rate of the intermediate shaft.
The control device that may control the intermediate shaft brake may stop detecting the intermediate shaft deceleration rate when the intermediate shaft deceleration value is greater than or equal to a difference between the first intermediate shaft rotation speed and the intermediate shaft rotation speed control target value. That is, when the intermediate shaft deceleration value is greater than or equal to the difference between the first intermediate shaft rotational speed and the intermediate shaft rotational speed control target value, the brake control of the intermediate shaft brake is stopped. That is, when the intermediate shaft deceleration value is greater than or equal to the difference between the first intermediate shaft rotational speed and the intermediate shaft rotational speed control target value, the opening command or the closing command is no longer transmitted to the intermediate shaft brake switching valve. The gear shifting device has the advantages that the deceleration of the intermediate shaft is adjusted through the intermediate shaft rotating speed micro-control function, the problem that the gear shifting time is long due to the fact that the intermediate shaft brake releases braking in advance is solved, and the gear shifting time is shortened on the premise that the gear shifting quality is guaranteed.
And S6, sending a releasing instruction to the intermediate shaft brake switch valve, wherein the releasing instruction is used for instructing the intermediate shaft brake switch valve to close.
In order to avoid the intermediate shaft brake switching valve being in an open state when the brake control of the intermediate shaft brake is stopped, it is also necessary to send a release instruction for instructing the intermediate shaft brake switching valve to close to the intermediate shaft brake switching valve.
In the control method of the intermediate shaft brake provided by the embodiment, the upper limit value of the deceleration rate of the intermediate shaft and the lower limit value of the deceleration rate of the intermediate shaft are determined firstly, and then the deceleration rate of the intermediate shaft is controlled between the upper limit value of the deceleration rate of the intermediate shaft and the lower limit value of the deceleration rate of the intermediate shaft by controlling the opening and closing of the switch valve of the intermediate shaft brake, so that the deceleration rate of the intermediate shaft can adapt to the brake release characteristic, the lag of the pneumatic control of the switch valve of the intermediate shaft brake can be compensated, the occurrence of the over-braking condition can be prevented, the intermediate shaft speed and the deceleration rate of the intermediate shaft required by the shifting of the sliding gear sleeve can be ensured, the shifting success.
Example two
Fig. 3 is a flowchart of a control method for an intermediate shaft brake according to a second embodiment of the present invention, where the present embodiment is optimized based on the second embodiment, and the method includes the following steps:
and S1, acquiring the transmission oil temperature of the automatic transmission.
And S2, determining an upper limit value and a lower limit value of the intermediate shaft deceleration rate of the automatic transmission according to the oil temperature of the transmission and the reference value of the intermediate shaft deceleration rate.
S3, periodically detecting the deceleration rate of the intermediate shaft within a first preset time period, sending a closing instruction to the intermediate shaft brake switch valve when the current deceleration rate of the intermediate shaft is greater than the lower limit value of the deceleration rate of the intermediate shaft, wherein the closing instruction is used for indicating the intermediate shaft brake switch valve to be closed, and sending an opening instruction to the intermediate shaft brake switch valve when the current deceleration rate of the intermediate shaft is less than or equal to the lower limit value of the deceleration rate of the intermediate shaft, and the opening instruction is used for controlling the intermediate shaft brake switch valve to be opened.
And S4, judging whether the intermediate shaft deceleration value is larger than or equal to the difference value between the first intermediate shaft rotation speed and the intermediate shaft rotation speed control target value at the moment corresponding to the intermediate shaft deceleration value, if so, executing a step S5, and if not, executing a step S3.
And S5, stopping detecting the deceleration rate of the intermediate shaft.
And S6, sending a releasing instruction to the intermediate shaft brake switch valve, wherein the releasing instruction is used for instructing the intermediate shaft brake switch valve to close.
For the details of the steps S1 to S6, refer to the steps S1 to S6 in the first embodiment, which are not repeated in this embodiment.
And S7, judging whether the brake of the intermediate shaft is released, if so, executing a step S8, and otherwise, executing a step S6.
After the release instruction is sent to the intermediate shaft brake switching valve, the release condition of the intermediate shaft brake can be judged. Alternatively, it may be determined whether the brake of the intermediate shaft is released according to whether the intermediate shaft enters the free deceleration state. For example, when the counter shaft enters the free-wheeling state, it may be determined that the counter shaft brake has been released, at which point step S8 may be continued; when the intermediate shaft does not enter the free deceleration state, it may be determined that the intermediate shaft brake is not released, and at this time, the step S6 needs to be continuously executed, that is, a release instruction is sent to the intermediate shaft brake switching valve, and then the contact of the intermediate shaft brake is determined.
The intermediate shaft enters a free deceleration state, namely the deceleration rate of the intermediate shaft is not influenced by other conditions. For example, the deceleration rate of the intermediate shaft when the intermediate shaft enters the free deceleration state can be queried in a factory specification of the intermediate shaft, at this time, it is only required to judge whether the deceleration rate of the deceleration intermediate shaft is equal to the deceleration rate of the intermediate shaft when the intermediate shaft enters the free deceleration state, if so, it can be determined that the intermediate shaft enters the free deceleration state, and if not, it can be determined that the intermediate shaft does not enter the free deceleration state.
And S8, judging whether the current intermediate shaft rotating speed is less than or equal to the intermediate shaft rotating speed control target value, if so, ending the process, and if not, executing the step S9.
After the intermediate shaft brake is released, the current intermediate shaft rotation speed needs to be compared with the intermediate shaft rotation speed control target value to prevent the intermediate shaft rotation speed after the intermediate shaft brake is released from being too large. And when the current intermediate shaft rotating speed is less than or equal to the intermediate shaft rotating speed control target value, ending the control of the intermediate shaft brake by the control method of the intermediate shaft brake. When the current intermediate shaft rotation speed is less than or equal to the intermediate shaft rotation speed control target value, the intermediate shaft brake needs to be continuously controlled.
And S9, intermittently sending a first fine adjustment instruction and a second fine adjustment instruction to the intermediate shaft brake on-off valve within a second preset time length so as to enable the intermediate shaft to decelerate at an intermediate shaft micro deceleration rate, wherein the first fine adjustment instruction is used for indicating the intermediate shaft brake on-off valve to be opened, and the second fine adjustment instruction is used for indicating the intermediate shaft brake on-off valve to be closed.
When the current intermediate shaft rotating speed is less than or equal to the intermediate shaft rotating speed control target value, the intermediate shaft rotating speed is still larger, and at the moment, the intermediate shaft brake switch valve needs to be started again to adjust the intermediate shaft rotating speed. For example, a first fine adjustment command may be sent to the intermediate shaft brake switch valve first, and after a period of time, a second fine adjustment command may be sent to the intermediate shaft brake switch valve, so as to cycle until a second preset time period elapses.
And S10, judging whether the middle shaft rotating speed after fine adjustment is less than or equal to the middle shaft rotating speed control target value, if so, ending the process, and if not, executing the step S9.
The fine-tuned intermediate shaft rotation speed may be the intermediate shaft rotation speed fine-tuned in step S9, and if the fine-tuned intermediate shaft rotation speed is still greater than the intermediate shaft rotation speed control target value, the intermediate shaft needs to be fine-tuned again until the fine-tuned intermediate shaft rotation speed is less than or equal to the intermediate shaft rotation speed control target value.
In the control method of the intermediate shaft brake provided in the second embodiment, it may be determined whether the intermediate shaft brake is released or not, and when the intermediate shaft brake is not released and the current rotational speed of the intermediate shaft is greater than the intermediate shaft rotational speed control target value, the intermediate shaft rotational speed may be gradually adjusted by intermittently sending the first fine adjustment instruction and the second fine adjustment instruction to the intermediate shaft brake switch valve, so as to ensure that the rotational speed of the intermediate shaft may be lower than the intermediate shaft rotational speed control target value.
EXAMPLE III
Fig. 4 is a flowchart of a control method for an intermediate shaft brake according to a third embodiment of the present invention, where the present embodiment is optimized based on the above embodiments, and the method includes the following steps:
and S1, acquiring the transmission oil temperature of the automatic transmission.
And S2, determining an upper limit value and a lower limit value of the intermediate shaft deceleration rate of the automatic transmission according to the oil temperature of the transmission and the reference value of the intermediate shaft deceleration rate.
And S3, periodically detecting the deceleration rate of the intermediate shaft within a first preset time period, sending a closing instruction to the intermediate shaft brake switch valve when the current deceleration rate of the intermediate shaft is greater than the lower limit value of the deceleration rate of the intermediate shaft, wherein the closing instruction is used for indicating the intermediate shaft brake switch valve to be closed, and sending an opening instruction to the intermediate shaft brake switch valve when the current deceleration rate of the intermediate shaft is less than or equal to the lower limit value of the deceleration rate of the intermediate shaft, and the opening instruction is used for controlling the intermediate shaft brake switch valve to be opened.
And S4, judging whether the intermediate shaft deceleration value is larger than or equal to the difference value between the first intermediate shaft rotation speed and the intermediate shaft rotation speed control target value at the moment corresponding to the intermediate shaft deceleration value, if so, executing a step S5, and if not, executing a step S3.
And S5, stopping detecting the deceleration rate of the intermediate shaft.
And S6, sending a releasing instruction to the intermediate shaft brake switch valve, wherein the releasing instruction is used for instructing the intermediate shaft brake switch valve to close.
For the details of the steps S1 to S6, refer to the steps S1 to S6 in the first embodiment, which are not repeated in this embodiment.
And S11, judging whether the brake of the intermediate shaft is released or not, if so, executing a step S12, and if not, executing a step S6.
For the specific case of step S11, reference may be made to step S7 in the second embodiment, which is not described again in this embodiment.
And S12, judging whether the current intermediate shaft rotating speed is less than or equal to the intermediate shaft rotating speed control target value, if so, ending the process, and if not, executing the step S13.
For the specific case of step S12, reference may be made to step S8 in the second embodiment, which is not described again in this embodiment.
And S13, acquiring a first time length for the target intermediate shaft rotating speed to be reduced to the intermediate shaft rotating speed control target value, wherein the target intermediate shaft rotating speed is the rotating speed of the intermediate shaft after the releasing instruction is sent to the intermediate shaft brake switch valve.
In this embodiment, after the release instruction is sent to the intermediate shaft brake switch valve, the sending time may be recorded, and when the intermediate shaft rotation speed decreases to the intermediate shaft rotation speed control target value, the arrival time may be recorded again, and the difference between the two times may be used as the first time period in step S13. It is therefore possible to determine the time taken for the intermediate shaft rotational speed to fall to the intermediate shaft rotational speed control target value.
And S14, judging whether the first time length is less than or equal to the time length threshold value of the free deceleration of the intermediate shaft, if so, ending the process, and if not, executing the step S15.
After the first time length is obtained, the first time length can be compared with a free deceleration time length threshold of the intermediate shaft, if the first time length is smaller than or equal to the free deceleration time length threshold of the intermediate shaft, the control on the intermediate shaft can be finished, and if the first time length is larger than the free deceleration time length threshold of the intermediate shaft, the rotating speed of the intermediate shaft needs to be further adjusted. The intermediate shaft free speed reduction time length threshold value can be the time for reducing the target intermediate shaft rotating speed to the intermediate shaft rotating speed control target value when the intermediate shaft is subjected to free speed reduction.
And S15, intermittently sending a first fine adjustment instruction and a second fine adjustment instruction to the intermediate shaft brake switch valve within a second preset time length so as to enable the intermediate shaft to decelerate at an intermediate shaft micro deceleration rate, wherein the first fine adjustment instruction is used for indicating the intermediate shaft brake switch valve to be opened, and the second fine adjustment instruction is used for indicating the intermediate shaft brake switch valve to be closed.
For the specific case of step S15, reference may be made to step S9 in the second embodiment, which is not described again in this embodiment.
And S16, judging whether the middle shaft rotating speed after fine adjustment is less than or equal to the middle shaft rotating speed control target value, if so, ending the process, and if not, executing the step S15.
For the specific case of step S16, reference may be made to step S10 in the second embodiment, which is not described again in this embodiment.
Optionally, the first time period is equal to a ratio of a target difference value to a free deceleration rate of the intermediate shaft, and the target difference value is a difference between a current intermediate shaft rotation speed and an intermediate shaft rotation speed control target value.
In the embodiment, whether the intermediate shaft rotating speed and the intermediate shaft deceleration rate need to be adjusted or not can be determined by the time length for reducing the intermediate shaft rotating speed to the intermediate shaft rotating speed control target value, so that the efficiency of adjusting the intermediate shaft rotating speed is improved.
Example four
The present embodiment provides a control device of an intermediate shaft brake that can adopt the braking method of the intermediate shaft brake in the above-described embodiments, as shown in fig. 5, the control device of the intermediate shaft brake including:
the first obtaining module 501 is configured to obtain a transmission oil temperature of an automatic transmission.
The first determination module 502 is configured to determine an upper intermediate shaft deceleration rate limit and a lower intermediate shaft deceleration rate limit of the automatic transmission according to the transmission oil temperature and an intermediate shaft deceleration rate reference value.
The first sending module 503 is configured to periodically detect the intermediate shaft deceleration rate within a first preset time period, send a closing instruction to the intermediate shaft brake switch valve when the current intermediate shaft deceleration rate is greater than the intermediate shaft deceleration rate lower limit, where the closing instruction is used to instruct the intermediate shaft brake switch valve to close, and send an opening instruction to the intermediate shaft brake switch valve when the current intermediate shaft deceleration rate is less than or equal to the intermediate shaft deceleration rate lower limit, where the opening instruction is used to control the intermediate shaft brake switch valve to open.
The first determining module 504 is configured to determine whether the intermediate shaft deceleration value is greater than or equal to a difference between a first intermediate shaft rotation speed at a time corresponding to the intermediate shaft deceleration value and the intermediate shaft rotation speed control target value.
And a stopping module 505 for stopping detecting the countershaft deceleration rate.
And a second sending module 506, configured to send a release instruction to the intermediate shaft brake switch valve, where the release instruction is used to instruct the intermediate shaft brake switch valve to close.
Further, the control device of the intermediate shaft brake described above may further include:
and the second judgment module is used for judging whether the braking of the intermediate shaft is released.
And the third judging module is used for judging whether the current intermediate shaft rotating speed is less than or equal to the intermediate shaft rotating speed control target value.
The second obtaining module is used for obtaining a first duration that the target intermediate shaft rotating speed is reduced to the intermediate shaft rotating speed control target value, and the target intermediate shaft rotating speed is the rotating speed of the intermediate shaft after the releasing instruction is sent to the intermediate shaft brake switch valve.
And the fourth judging module is used for judging whether the first time length is less than or equal to a time length threshold value of free deceleration of the intermediate shaft.
And the fine adjustment module is used for intermittently sending a first fine adjustment instruction and a second fine adjustment instruction to the switch valve of the intermediate shaft brake within a second preset time length so as to enable the intermediate shaft to decelerate at an intermediate shaft micro deceleration rate, the first fine adjustment instruction is used for indicating the switch valve of the intermediate shaft brake to be opened, and the second fine adjustment instruction is used for indicating the switch valve of the intermediate shaft brake to be closed.
And the fifth judging module is used for judging whether the middle shaft rotating speed after fine adjustment is less than or equal to the middle shaft rotating speed control target value.
The control device of the intermediate shaft brake provided by the fourth embodiment of the invention belongs to the same inventive concept as the control method of the intermediate shaft brake provided by the previous embodiment, and the technical details which are not described in detail in the present embodiment can be referred to the previous embodiment, and the present embodiment has the same beneficial effects as the execution of the control method of the intermediate shaft brake.
EXAMPLE five
Fig. 6 is a schematic structural view of the vehicle in the present embodiment. FIG. 6 illustrates a block diagram of an exemplary vehicle 312 used to implement embodiments of the present invention. The vehicle 312 shown in fig. 6 is only an example, and should not bring any limitations to the function and scope of use of the embodiments of the present invention.
As shown in fig. 6, the vehicle 312 is represented in the form of a general-purpose terminal. The components of the vehicle 312 may include, but are not limited to: a vehicle body (not shown), one or more processors 316, a memory device 328, and a bus 318 connecting the various system components, including the memory device 328 and the processors 316.
The vehicle 312 includes a variety of computer system readable media. Such media may be any available media that is accessible by vehicle 312 and includes both volatile and nonvolatile media, removable and non-removable media.
A program/utility 340 having a set (at least one) of program modules 342 may be stored, for example, in storage 328, such program modules 342 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which examples or some combination thereof may comprise an implementation of a network environment. Program modules 342 generally perform the functions and/or methodologies of the described embodiments of the invention.
The vehicle 312 may also communicate with one or more external devices 314 (e.g., keyboard, pointing terminal, display 324, etc.), with one or more terminals that enable a user to interact with the vehicle 312, and/or with any terminals (e.g., network card, modem, etc.) that enable the vehicle 312 to communicate with one or more other computing terminals. Such communication may occur via input/output (I/O) interfaces 322. Also, the vehicle 312 may communicate with one or more networks (e.g., a Local Area Network (LAN), Wide Area Network (WAN), and/or a public Network, such as the internet) via the Network adapter 320. As shown in FIG. 6, the network adapter 320 communicates with the other modules of the vehicle 312 via the bus 318. It should be appreciated that although not shown in the figures, other hardware and/or software modules may be used in conjunction with the vehicle 312, including but not limited to: microcode, end drives, Redundant processors, external disk drive Arrays, RAID (Redundant Arrays of Independent Disks) systems, tape drives, and data backup storage systems, among others.
The processor 316 executes various functional applications and data processing by running a program stored in the storage device 328, for example, to implement a control method of the intermediate shaft brake provided by the embodiment of the present invention, including:
s1, acquiring the transmission oil temperature of the automatic transmission;
s2, determining an upper limit value and a lower limit value of the intermediate shaft deceleration rate of the automatic transmission according to the oil temperature of the transmission and the reference value of the intermediate shaft deceleration rate;
s3, periodically detecting the deceleration rate of the intermediate shaft within a first preset time length, sending a closing instruction to an intermediate shaft brake switch valve when the current deceleration rate of the intermediate shaft is greater than the lower limit value of the deceleration rate of the intermediate shaft, wherein the closing instruction is used for indicating the intermediate shaft brake switch valve to be closed, and sending an opening instruction to the intermediate shaft brake switch valve when the current deceleration rate of the intermediate shaft is less than or equal to the lower limit value of the deceleration rate of the intermediate shaft, and the opening instruction is used for controlling the intermediate shaft brake switch valve to be opened;
s4, judging whether the intermediate shaft deceleration value is larger than or equal to the difference value between the first intermediate shaft rotation speed and the intermediate shaft rotation speed control target value at the moment corresponding to the intermediate shaft deceleration value, if so, executing a step S5, and if not, executing a step S3;
s5, stopping detecting the deceleration rate of the intermediate shaft;
and S6, sending a releasing instruction to the intermediate shaft brake switch valve, wherein the releasing instruction is used for instructing the intermediate shaft brake switch valve to close.
The fifth embodiment of the invention provides a vehicle and a control method of an intermediate shaft brake provided by the above embodiments, which belong to the same inventive concept, and the technical details which are not described in detail in the present embodiment can be referred to the above embodiments, and the present embodiment has the same beneficial effects as the execution of the control method of the intermediate shaft brake.
EXAMPLE six
A sixth embodiment of the present invention further provides a storage medium, on which a computer program is stored, where the program, when executed by a vehicle controller, implements the control method for the intermediate shaft brake according to the sixth embodiment of the present invention.
Of course, the storage medium containing the computer executable instructions provided by the embodiment of the present invention is not limited to the operations in the control method of the intermediate shaft brake described above, and can also perform the related operations in the control method of the intermediate shaft brake provided by the embodiment of the present invention, and has the corresponding functions and advantages.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, and the computer software product may be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions to enable a computer device (which may be a robot, a personal computer, a server, or a network device) to execute the method for controlling the countershaft brake according to the embodiments of the present invention.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A method of controlling an intermediate shaft brake, comprising the steps of:
s1, acquiring the transmission oil temperature of the automatic transmission;
s2, determining an upper limit value and a lower limit value of the intermediate shaft deceleration rate of the automatic transmission according to the oil temperature of the transmission and the reference value of the intermediate shaft deceleration rate;
s3, periodically detecting the deceleration rate of the intermediate shaft within a first preset time period, sending a closing instruction to an intermediate shaft brake switch valve when the current deceleration rate of the intermediate shaft is greater than the lower limit value of the deceleration rate of the intermediate shaft, wherein the closing instruction is used for indicating the intermediate shaft brake switch valve to be closed, and sending an opening instruction to the intermediate shaft brake switch valve when the current deceleration rate of the intermediate shaft is less than or equal to the lower limit value of the deceleration rate of the intermediate shaft, and the opening instruction is used for controlling the intermediate shaft brake switch valve to be opened;
s4, judging whether the intermediate shaft deceleration value is larger than or equal to the difference value between the first intermediate shaft rotation speed and the intermediate shaft rotation speed control target value at the moment corresponding to the intermediate shaft deceleration value, if so, executing a step S5, and if not, executing a step S3;
s5, stopping detecting the deceleration rate of the intermediate shaft;
and S6, sending a releasing instruction to the intermediate shaft brake switch valve, wherein the releasing instruction is used for indicating the intermediate shaft brake switch valve to be closed.
2. The intermediate shaft brake control method according to claim 1, characterized in that before step S2, the method further comprises:
s20, acquiring a target value of the intermediate shaft deceleration difference;
and S30, determining an intermediate shaft deceleration rate reference value according to the intermediate shaft deceleration speed difference target value and the transmission oil temperature.
3. The intermediate shaft brake control method according to claim 2, characterized in that after the step S6, the method further comprises:
s7, judging whether the braking of the intermediate shaft is released, if so, executing a step S8, otherwise, executing a step S6;
s8, judging whether the current intermediate shaft rotating speed is less than or equal to the intermediate shaft rotating speed control target value, if so, ending the process, and if not, executing a step S9;
s9, intermittently sending a first fine adjustment instruction and a second fine adjustment instruction to the intermediate shaft brake switch valve within a second preset time length so as to enable the intermediate shaft to decelerate at an intermediate shaft micro deceleration rate, wherein the first fine adjustment instruction is used for indicating the intermediate shaft brake switch valve to be opened, and the second fine adjustment instruction is used for indicating the intermediate shaft brake switch valve to be closed;
and S10, judging whether the middle shaft rotating speed after fine adjustment is less than or equal to the middle shaft rotating speed control target value, if so, ending the process, and if not, executing the step S9.
4. The intermediate shaft brake control method according to claim 2, characterized in that after the step S6, the method further comprises:
s11, judging whether the brake of the intermediate shaft is released or not, if so, executing a step S12, and if not, executing a step S6;
s12, judging whether the current intermediate shaft rotating speed is less than or equal to the intermediate shaft rotating speed control target value, if so, ending the process, and if not, executing a step S13;
s13, acquiring a first time length for the rotating speed of a target intermediate shaft to be reduced to the intermediate shaft rotating speed control target value, wherein the target intermediate shaft rotating speed is the rotating speed of the intermediate shaft after a release instruction is sent to the intermediate shaft brake switch valve;
s14, judging whether the first time length is smaller than or equal to a free deceleration time length threshold of the intermediate shaft, if so, ending the process, and if not, executing a step S15;
s15, intermittently sending a first fine adjustment instruction and a second fine adjustment instruction to the intermediate shaft brake switch valve within a second preset time length so as to enable the intermediate shaft to decelerate at an intermediate shaft micro deceleration rate, wherein the first fine adjustment instruction is used for indicating the intermediate shaft brake switch valve to be opened, and the second fine adjustment instruction is used for indicating the intermediate shaft brake switch valve to be closed;
and S16, judging whether the middle shaft rotating speed after fine adjustment is less than or equal to the middle shaft rotating speed control target value, if so, ending the process, and if not, executing the step S15.
5. The control method of an intermediate shaft brake according to claim 4, characterized in that the first period is equal to a ratio of a target difference value, which is a difference between the current intermediate shaft rotation speed and the intermediate shaft rotation speed control target value, to an intermediate shaft free-fall rate.
6. The intermediate shaft brake control method according to any one of claims 1 to 5, wherein before the step S4, the method further includes:
when the intermediate shaft brake switch valve is in an open state, determining an intermediate shaft deceleration value according to the transmission oil temperature and the intermediate shaft deceleration rate upper limit value;
and when the intermediate shaft brake switch valve is in a closed state, determining the intermediate shaft deceleration value according to the transmission oil temperature and the current intermediate shaft deceleration rate.
7. The intermediate shaft brake control method according to any one of claims 2 to 5, wherein the step S20 includes:
s201, obtaining the rotating speed of a starting intermediate shaft;
s202, acquiring a target rotation speed control value of the intermediate shaft;
s203, determining the difference value between the starting intermediate shaft rotating speed and the intermediate shaft rotating speed control target value as an intermediate shaft speed reduction difference target value.
8. A control device for an intermediate shaft brake, comprising:
the automatic transmission control device comprises a first obtaining module, a second obtaining module and a control module, wherein the first obtaining module is used for obtaining transmission oil temperature of the automatic transmission;
the first determination module is used for determining an upper limit value and a lower limit value of a middle shaft deceleration rate of the automatic transmission according to the transmission oil temperature and a reference value of the middle shaft deceleration rate;
the device comprises a first sending module, a second sending module and a control module, wherein the first sending module is used for periodically detecting the deceleration rate of the intermediate shaft within a first preset time length, sending a closing instruction to an intermediate shaft brake switch valve when the current deceleration rate of the intermediate shaft is greater than the lower limit value of the deceleration rate of the intermediate shaft, the closing instruction being used for indicating the intermediate shaft brake switch valve to be closed, and sending an opening instruction to the intermediate shaft brake switch valve when the current deceleration rate of the intermediate shaft is less than or equal to the lower limit value of the deceleration rate of the intermediate shaft, the opening instruction being used for controlling the intermediate shaft brake switch valve to be opened;
the first judgment module is used for judging whether the intermediate shaft deceleration value is greater than or equal to the difference value between the first intermediate shaft rotation speed and the intermediate shaft rotation speed control target value at the moment corresponding to the intermediate shaft deceleration value;
the stopping module is used for stopping detecting the deceleration rate of the intermediate shaft;
the second sending module is used for sending a releasing instruction to the intermediate shaft brake switch valve, and the releasing instruction is used for indicating the intermediate shaft brake switch valve to be closed.
9. A vehicle, characterized by comprising:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement a method of controlling an intermediate shaft brake as defined in any one of claims 1 to 7.
10. A storage medium on which a computer program is stored, which program, when executed by a vehicle controller, carries out a method of controlling an intermediate shaft brake according to any one of claims 1 to 7.
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| CN201911233561.5A CN110985655B (en) | 2019-12-05 | 2019-12-05 | Control method and device of intermediate shaft brake, vehicle and storage medium |
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| CN201911233561.5A CN110985655B (en) | 2019-12-05 | 2019-12-05 | Control method and device of intermediate shaft brake, vehicle and storage medium |
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| CN112145668B (en) * | 2020-09-21 | 2021-11-12 | 东风商用车有限公司 | Method for synchronously controlling rotating speed of commercial vehicle AMT during gear shifting |
| CN112081912B (en) * | 2020-09-25 | 2021-09-28 | 一汽解放汽车有限公司 | Static gear shifting control method and static gear shifting control system |
| CN112360970B (en) * | 2020-11-24 | 2022-03-25 | 一汽解放汽车有限公司 | Static gear-engaging self-adaption method without synchronizer |
| CN114382808B (en) * | 2022-01-21 | 2023-06-23 | 一汽解放汽车有限公司 | Intermediate shaft brake control method |
| CN114382878B (en) * | 2022-01-24 | 2023-03-14 | 一汽解放汽车有限公司 | Transmission intermediate shaft brake control method, storage medium and vehicle |
| CN114382798B (en) * | 2022-01-24 | 2023-06-16 | 一汽解放汽车有限公司 | Intermediate shaft brake control self-learning method, storage medium and vehicle |
| CN114754136B (en) * | 2022-04-28 | 2024-01-16 | 一汽解放汽车有限公司 | Sliding tooth sleeve control method, automobile and computer readable storage medium |
| CN115013520B (en) * | 2022-06-17 | 2024-05-17 | 潍柴动力股份有限公司 | AMT gearbox intermediate shaft braking control method, device and controller |
| CN115031019B (en) * | 2022-07-04 | 2024-07-30 | 一汽解放汽车有限公司 | Brake control method, device, controller and medium |
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| KR100828682B1 (en) * | 2006-09-21 | 2008-05-09 | 현대자동차주식회사 | Apparatus for braking counter shaft of transmission |
| US8308609B2 (en) * | 2010-06-14 | 2012-11-13 | Ford Global Technologies, Llc | Power-off downshift engagement dampening |
| SE1450970A1 (en) * | 2014-08-21 | 2016-02-22 | Scania Cv Ab | Transmission for vehicles, vehicles comprising such a transmission and method for controlling a transmission |
| JP6350458B2 (en) * | 2015-09-03 | 2018-07-04 | トヨタ自動車株式会社 | Vehicle control device |
| CN106641195A (en) * | 2017-01-23 | 2017-05-10 | 中国第汽车股份有限公司 | Heavy 12-gear AMT transmission assembly |
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