CN114294413A - Method, device, equipment and medium for correcting boundary current of dead zone of shift flow valve - Google Patents
Method, device, equipment and medium for correcting boundary current of dead zone of shift flow valve Download PDFInfo
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Abstract
The invention belongs to the technical field of transmission control, and discloses a method, a device, equipment and a medium for correcting a boundary current of a dead zone of a shift flow valve, wherein the method comprises the following steps: after the shifting fork is shifted, judging whether a correction condition is met or not according to the acceleration of the output shaft of the vehicle, the oil temperature of the transmission and the accumulated gear shifting times; if yes, pushing in the shifting fork twice; judging whether the variable quantity of the voltage of the shifting fork in unit time reaches a variable quantity threshold value or not; if so, adding one to the dead zone reduction counter number, and if not, adding one to the dead zone expansion counter number; judging whether the number of times of the dead zone reduction counter reaches a dead zone reduction number threshold or judging whether the number of times of the dead zone expansion counter reaches a dead zone expansion number threshold; and if so, determining the corrected boundary current according to the current boundary current. The influence on the normal working condition running of the whole vehicle caused by frequent triggering of the self-learning of the dead zone range can be avoided, and a dead zone reduction and dead zone expansion counting mechanism is introduced, so that the influence on the system is small due to the fact that the dead zone reduction and dead zone expansion counting mechanism is close to the actual physical characteristic.
Description
Technical Field
The invention relates to the technical field of transmission control, in particular to a method, a device, equipment and a medium for correcting a boundary current of a dead zone of a shift flow valve.
Background
In the field of transmission control, the mode of controlling shifting of a shifting fork through a shifting pressure electromagnetic valve and a shifting flow electromagnetic valve is gradually applied to a transmission hydraulic control system. Through the current control of the control unit to the gear shifting flow electromagnetic valve, the oil quantity of the transmission hydraulic oil flowing through the hydraulic oil duct can be controlled, the movement speed of the transmission gear shifting fork is further accurately controlled, and the gear shifting control of the transmission is realized. Due to the existence of the neutral dead zone of the shift flow solenoid valve, the stability of a hydraulic system of the transmission and the dynamic response characteristic of the system can be seriously influenced.
In the automobile industry, the production cost of the electromagnetic valve can be increased by accurately detecting the middle dead zone of the large-batch flow electromagnetic valve, each flow and current point of the flow electromagnetic valve cannot be measured one by one in the actual production process, and certain deviation can also occur in the middle dead zone area of the flow electromagnetic valve in the use process of a vehicle. The speed changer electronic control unit TCU needs to accurately identify the middle position dead zone of the flow electromagnetic valve, the response characteristic of a speed changer hydraulic system can be improved, and the risk that the speed changer is shifted wrongly and faults of the speed changer are caused due to inaccurate identification of the middle position dead zone of the flow valve is avoided.
In addition, the shift fork begins to study from the middle part among the prior art, and in the driving process, can only use idle shift fork to study the flow valve dead zone scope of shifting, has certain risk when the driver has the demand of shifting gears.
Disclosure of Invention
The invention aims to provide a method, a device, equipment and a medium for correcting the dead zone boundary current of a shift flow valve, so as to solve the problem that the dead zone range of the shift flow valve cannot be learned in the driving process.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, a method for correcting a shift flow valve dead zone boundary current comprises the following steps:
after the shifting fork is shifted, judging whether a correction condition is met or not according to the acceleration of the output shaft of the vehicle, the oil temperature of the transmission and the accumulated gear shifting times;
if yes, pushing in the shifting fork twice;
judging whether the voltage variation of the shifting fork in unit time reaches a variation threshold value;
if so, adding one to the dead zone reduction counter number, and if not, adding one to the dead zone expansion counter number;
judging whether the number of times of the dead zone reduction counter reaches a dead zone reduction number threshold or judging whether the number of times of the dead zone expansion counter reaches a dead zone expansion number threshold;
and if so, determining the corrected boundary current according to the current boundary current.
As an optimal scheme of the method for correcting the boundary current of the dead zone of the shift flow valve, after the shifting fork is engaged, the method comprises the following steps:
in the driving process, the shifting fork is shifted and then collides with the wall to rebound after preset time.
As a preferable scheme of the method for correcting the boundary current of the dead zone of the shift flow valve, the judging whether the correction condition is met according to the acceleration of the output shaft of the vehicle, the oil temperature of the transmission and the accumulated shift times includes:
judging whether the acceleration of the output shaft of the vehicle is smaller than an acceleration threshold value or not;
judging whether the transmission system has no fault;
judging whether the oil temperature of the transmission is within a preset temperature range or not;
judging whether the accumulated gear shifting times reach preset times or not;
if yes, judging that the correction condition is met.
As a preferable scheme of the method for correcting the boundary current of the dead zone of the shift flow valve, the determining whether the accumulated number of shifts reaches a preset number includes:
if the accumulated number of gear shifts reaches 104N to 104And when the value is between N +1000, N is a natural number, and the accumulated gear shifting times are judged to reach the preset times.
As a preferable scheme of the method for correcting the boundary current of the dead zone of the shift flow valve, the twice pushing of the shifting fork comprises the following steps:
determining a pushing command pressure of the shifting fork according to the oil temperature of the transmission;
and determining the pushing command flow of the shifting fork according to the current dead zone boundary current and the fixed current offset value.
As a preferable embodiment of the method for correcting the dead zone boundary current of the shift flow valve, the determining whether the variation of the voltage of the shift fork in unit time reaches a variation threshold includes:
acquiring a first fork voltage of a position of the fork when the command pressure and the push command flow are given;
acquiring a second shifting fork voltage of the shifting fork after the shifting fork gives the command pressure and the push command flow per unit time length;
determining a variation amount of a voltage of the shift fork according to the first shift fork voltage and the second shift fork voltage;
and judging whether the variation is larger than the variation threshold value.
As a preferable scheme of the method for correcting the dead zone boundary current of the shift flow valve, the dead zone reduction number threshold is smaller than the dead zone expansion number threshold.
As a preferable scheme of the method for correcting the dead zone boundary current of the shift flow valve, the determining the corrected boundary current according to the current boundary current includes:
when the number of times of the dead zone reduction counter reaches the threshold of the number of times of dead zone reduction, the current boundary current is increased by a learning step length to be used as the corrected boundary current, or when the number of times of the dead zone expansion counter reaches the threshold of the number of times of dead zone expansion, the current boundary current is decreased by the learning step length to be used as the corrected boundary current;
and correspondingly clearing the dead zone reduction counter or the dead zone expansion counter.
As a preferable aspect of the method for correcting the shift flow valve dead zone boundary current, the determining a corrected boundary current according to the current boundary current includes:
judging whether the corrected boundary current is in a physical range of a middle dead zone;
if yes, updating the current boundary current according to the corrected boundary current;
and finishing the correction.
As a preferable scheme of the method for correcting the dead zone boundary current of the shift flow valve, if the corrected boundary current is not in the middle dead zone physical range, the correction is finished.
In a second aspect, a shift flow valve dead band boundary current modification apparatus, comprising:
the correction condition judgment module is used for judging whether the correction condition is met or not according to the acceleration of the output shaft of the vehicle, the oil temperature of the transmission and the accumulated gear shifting times after the shifting fork is put into gear;
the twice pushing module is used for pushing the shifting fork twice if the shifting fork is in the first state;
the variable quantity judging module is used for judging whether the variable quantity of the voltage of the shifting fork in unit time reaches a variable quantity threshold value or not;
the counting module is used for adding one to the dead zone reduction counter number if the dead zone reduction counter is in the positive state, and adding one to the dead zone expansion counter number if the dead zone reduction counter is in the negative state;
the counter number judging module is used for judging whether the number of times of the dead zone reduction counter reaches a dead zone reduction number threshold or judging whether the number of times of the dead zone expansion counter reaches a dead zone expansion number threshold;
and the correction module is used for obtaining the corrected boundary current according to the current boundary current if the current boundary current is correct.
In a third aspect, an apparatus comprises a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor when executing the computer program implementing the shift flow valve dead band boundary current modification method as described above.
In a fourth aspect, a medium stores computer instructions that cause a computer to perform the shift flow valve dead band boundary current correction method as described above.
The invention has the beneficial effects that: the dead zone correction method, the device, the equipment and the medium of the gear shifting flow valve judge the correction condition according to the acceleration of a vehicle output shaft, the oil temperature of a transmission and the accumulated gear shifting times, can avoid the influence on the normal working condition running of the whole vehicle due to frequent triggering of self-learning of the dead zone range, introduce a dead zone reduction and dead zone expansion counting mechanism, determine the correction boundary current according to the current boundary current after the update condition is met, are closer to the actual physical characteristic, and have the advantages of small influence on the system, safety and reliability.
Drawings
FIG. 1 is a schematic illustration of a transmission hydraulic system according to a first and second embodiment of the present application;
FIG. 2 is a schematic flow chart of a dead band correction method for a shift flow valve according to a first embodiment of the present application;
FIG. 3 is a schematic flow chart of a method of correcting a shift flow valve dead band according to a second embodiment of the present application;
FIG. 4 is a schematic structural diagram of a dead band correction arrangement for a shift flow valve according to a third embodiment of the present application;
fig. 5 is a schematic structural diagram of an electronic device according to a fourth embodiment of the present application.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. 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 of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The first embodiment is as follows:
the embodiment provides a method for correcting the dead zone boundary current of a gear shifting flow valve, which is based on a hydraulic system of a transmission as shown in a figure 1. As shown in FIG. 1, the hydraulic system of the transmission comprises a shift pressure valve 1, an ACS valve 2 and a shifting fork 3 which are connected in sequence, and the correction method is applied to the system so as to shift the dead zone upper boundary current I of the ACS valve 2highAnd lower boundary current I of dead zonelowAnd (6) correcting.
Flow of shift flow valve dead zone boundary current correction methodWith reference to fig. 2, the present embodiment is directed to the lower boundary current I of the dead zonelowAnd (6) correcting.
Referring to fig. 2, the method includes step S100, after the shifting fork is put into gear, determining whether a correction condition is satisfied according to the acceleration of the vehicle output shaft, the oil temperature of the transmission and the accumulated number of gear shifts.
Specifically, what is meant after the shift fork put into gear is: in the driving process, the shifting fork enters the gear and then collides the wall to rebound after preset time. Further, in this embodiment, set up the shift fork and advance to keep off after through 0.6s, the shift fork advances to keep off and hits the wall and kick-backs. The time can ensure that the shifting fork is not influenced by the action of shifting force and generates new displacement and deformation.
The acceleration of the output shaft of the vehicle needs to be smaller than the acceleration limit value, and the acceleration limit value set in the embodiment is ± 10RPM/T, that is, the change of the rotation speed of the output shaft is smaller than 10RPM in each system operation period, and the system operation period is set to 10ms in the embodiment.
The oil temperature of the transmission is set within a limit range, and the set temperature limit is 40-120 degc.
The accumulated number of gear shifts includes all gear engaging and gear disengaging applied to the ACS flow valve, and in this embodiment, the accumulated number of gear shifts is set to 10 if the accumulated number of gear shifts reaches4N to 104N is a natural number when N +1000 is in the range, and for example, when N is 1 and the cumulative number of shifts reaches within ten thousand to ten thousand, and the above-described conditions concerning the acceleration of the vehicle output shaft and the oil temperature of the transmission are simultaneously satisfied, it is determined that the correction condition is satisfied. Or, when N is 2, the accumulated number of shifts reaches within twenty-four to twenty-one thousand, and the above-described conditions on the acceleration of the vehicle output shaft and the oil temperature of the transmission are satisfied, it is determined again that the correction condition is satisfied.
According to the condition judgment, the condition meeting the correction condition can be avoided, and the influence on the normal working condition running of the whole vehicle due to frequent triggering of the self-learning of the dead zone range can be avoided. Meanwhile, the durability change of the ACS valve is considered, and the valve can be corrected in time, so that the performance and the reliability of the system are ensured.
If the correction condition is satisfied, step S200 is performed to push in the shift fork twice. Specifically, a push-in command pressure of the shift fork is determined according to the transmission oil temperature, and a push-in command flow rate of the shift fork is determined according to the current dead zone boundary current and the fixed current offset value.
The pushing command pressure of the shifting fork is related to the oil temperature of the transmission, and the pushing command pressure of the shifting fork is determined by looking up a table in a map related to the oil temperature of the transmission according to the acquired oil temperature of the transmission. In the embodiment, the oil temperature of the transmission is in a range of 40degc-120degc, and the pushing command pressure of the shifting fork is in a range of 3Bar-5Bar, and is obtained according to a table look-up.
The push-in command flow of the fork is obtained according to the following formula:
push-in command flow is equal to current lower boundary current Q of dead zonelow-fixed current offset value Offset. In the present embodiment, for example, the present dead zone current ranges from 0.6A to 0.8A, i.e., the present dead zone lower boundary current is 0.6A and the present dead zone upper boundary current is 0.8A. Fixed current offset value OffsetFor calibration, in the embodiment of the present application, the calibration value is set to 50 mA.
Under the working condition of small-torque driving or braking and back dragging of the vehicle, the axial pressing force of the combined teeth can be overcome in the step S200, so that the shifting fork can be continuously hung in, the observation effect can be improved, and the influence caused by fine motion of the shifting fork is reduced; conservative fixed current offset value OffsetThe dead zone of the learned gear shifting flow valve can be guaranteed to be in a reliable range.
After the step S200, a step S300 is performed to determine whether the variation of the voltage of the shift fork per unit time reaches a variation threshold.
Step S300 specifically includes the following steps:
acquiring a first shifting fork voltage of a position of a shifting fork when a command pressure and a pushing command flow are given;
acquiring a second shifting fork voltage of the shifting fork after the shifting fork gives a command pressure and pushes a command flow for 1 second;
determining the variable quantity of the voltage of the shifting fork according to the first shifting fork voltage and the second shifting fork voltage;
and judging whether the variation is larger than a variation threshold.
Then, if the variation is larger than the variation threshold, step S400 is performed to increment the dead zone reduction counter by one.
Then, if the variation is smaller than the variation threshold, step S401 is performed to increment the number of times of the dead zone expansion counter by one.
It can be understood that if the variation is greater than the variation threshold, the shift fork moves in the shift direction by more than a certain deviation, which indicates that the shift flow valve is turned on, and counts once, and the dead zone reduction counter CountUp + 1, and if the variation is less than the variation threshold, the shift fork does not move, or moves in the shift-out direction by more than a certain deviation, which indicates that the shift flow valve is not turned on or turned on reversely, and counts once, and the dead zone expansion counter CountDown + 1.
After the step S400, step S500 is executed to determine whether the number of times of the dead zone reduction counter reaches a dead zone reduction number threshold, in this embodiment, the dead zone reduction number threshold is set to 5, that is, after the dead zone reduction counter reaches 5 times, step S600 is executed to determine and correct the lower boundary current according to the current lower boundary current. If the number of times of the dead zone reduction counter has not reached 5 times, the process returns to step S200.
Step S501 is executed after step S401, and it is determined whether the number of times of the dead zone expansion counter reaches a dead zone expansion number threshold, in this embodiment, the dead zone expansion number threshold is set to 7, that is, after the dead zone expansion counter reaches 7 times, step S600 is executed, and the lower boundary current is determined and corrected according to the current lower boundary current. If the number of times of the dead zone expansion counter has not reached 7 times, the process returns to step S200.
The dead zone expansion time threshold is larger than the dead zone reduction time threshold, namely, the learning of the dead zone range expansion is more difficult to trigger than the learning of the dead zone range reduction, thereby effectively ensuring the reliability of the system.
Specifically, step S600 performed after step S500 includes: adding a learning step length to the current lower boundary current to serve as a corrected lower boundary current; the dead zone reduction counter is cleared as the corrected boundary current. One learning step in this embodiment is set to 10 mA.
Step S600 performed after step S501 includes: reducing the current lower boundary current by a learning step as a corrected lower boundary current; and clearing the dead zone expansion counter.
Preferably, step S600 is followed by a verification step, so as to effectively ensure the reliability of the system. After step S600, step S700 is performed to determine whether the corrected lower boundary current is within the middle dead zone physical range. It should be noted that the middle dead zone physical range is a statistical value of the output current of the shift flow valve detected through multiple offline. In the embodiment of the application, the median dead zone physical range is set to 0.4A-1A.
If the corrected lower boundary current is within the physical range of the middle dead zone, step S800 is performed, and the current lower boundary current is updated according to the corrected lower boundary current, that is, the current corrected lower boundary current is used as the current lower boundary current in the next correction method step. After step S800, step S900 is performed to end the correction.
If the determination structure in step S700 is that the corrected lower boundary current is not in the middle dead zone physical range, and it is described that the lower boundary value of the dead zone of the shift flow valve cannot be corrected, step S900 is executed.
According to the method for correcting the dead zone boundary current of the gear shifting flow valve, the correction condition is judged according to the acceleration of the output shaft of the vehicle, the oil temperature of the transmission and the accumulated gear shifting times, the influence on the normal working condition running of the whole vehicle due to frequent triggering of self-learning of the dead zone range can be avoided, a dead zone reduction and dead zone expansion counting mechanism is introduced, the correction boundary current is determined according to the current boundary current after the updating condition is met, the method is closer to the actual physical characteristic, and the method has the advantages of small influence on the system, safety and reliability.
Example two:
the embodiment provides a method for correcting the dead zone boundary current of a gear shifting flow valve, which is based on a hydraulic system of a transmission as shown in a figure 1. As shown in FIG. 1, the hydraulic system of the transmission comprises a shift pressure valve 1, an ACS valve 2 and a shifting fork 3 which are connected in sequence, and the correction method is applied to the system so as to shift the dead zone upper boundary current I of the ACS valve 2highAnd lower boundary current I of dead zonelowAnd (6) correcting.
Referring to fig. 3, a flow chart of a shift flow valve dead zone boundary current correction method is shownExample is to limit the current I on the dead zonehighAnd (6) correcting.
Referring to fig. 3, the method includes step S1000, after the shifting fork is put into gear, judging whether a correction condition is satisfied according to the acceleration of the vehicle output shaft, the oil temperature of the transmission and the accumulated number of gear shifts.
Specifically, what is meant after the shift fork put into gear is: in the driving process, the shifting fork enters the gear and then collides the wall to rebound after preset time. Further, in this embodiment, set up the shift fork and advance to keep off after through 0.7s, the shift fork advances to keep off and hits the wall and kick-backs. The time can ensure that the shifting fork is not influenced by the action of shifting force and generates new displacement and deformation.
The acceleration of the output shaft of the vehicle needs to be smaller than the acceleration limit value, and the acceleration limit value set in the embodiment is ± 11RPM/T, that is, the change of the rotation speed of the output shaft is smaller than 11RPM in each system operation period, and the system operation period is set to 11ms in the embodiment.
The transmission oil temperature is set within a limit range, and the set temperature limit in the scheme is 35 deg-130 deg.
The accumulated number of gear shifts includes all gear engaging and gear disengaging applied to the ACS flow valve, and in this embodiment, the accumulated number of gear shifts is set to 10 if the accumulated number of gear shifts reaches4N to 104N is a natural number when N +1000 is in the range, and for example, when N is 1 and the cumulative number of shifts reaches within ten thousand to ten thousand, and the above-described conditions concerning the acceleration of the vehicle output shaft and the oil temperature of the transmission are simultaneously satisfied, it is determined that the correction condition is satisfied. Or, when N is 2, the accumulated number of shifts reaches within twenty-four to twenty-one thousand, and the above-described conditions on the acceleration of the vehicle output shaft and the oil temperature of the transmission are satisfied, it is determined again that the correction condition is satisfied.
According to the condition judgment, the condition meeting the correction condition can be avoided, and the influence on the normal working condition running of the whole vehicle due to frequent triggering of the self-learning of the dead zone range can be avoided. Meanwhile, the durability change of the ACS valve is considered, and the valve can be corrected in time, so that the performance and the reliability of the system are ensured.
If the correction condition is satisfied, the shift fork is pushed in twice in step S2000. Specifically, a push-in command pressure of the shift fork is determined according to the transmission oil temperature, and a push-in command flow rate of the shift fork is determined according to the current dead zone boundary current and the fixed current offset value.
The pushing command pressure of the shifting fork is related to the oil temperature of the transmission, and the pushing command pressure of the shifting fork is determined by looking up a table in a map related to the oil temperature of the transmission according to the acquired oil temperature of the transmission. In the embodiment, the oil temperature of the transmission is within a range of 35degc-130degc, and the pushing command pressure of the shifting fork is within a range of 3.2Bar-5.2Bar, which is obtained according to a table look-up.
The push-in command flow of the fork is obtained according to the following formula:
push-in command flow equal to current dead zone upper bound current Qlow-fixed current offset value Offset。
In the present embodiment, for example, the present dead zone current ranges from 0.55A to 0.85A, i.e., the present dead zone lower boundary current is 0.55A and the present dead zone upper boundary current is 0.85A. Fixed current offset value OffsetFor calibration, in the embodiment of the present application, the calibration value is set to 50 mA.
Under the working condition of small-torque driving or braking and back dragging of the vehicle, the axial pressing force of the combined teeth can be overcome in the step S200, so that the shifting fork can be continuously hung in, the observation effect can be improved, and the influence caused by fine motion of the shifting fork is reduced; conservative fixed current offset value OffsetThe dead zone of the learned gear shifting flow valve can be guaranteed to be in a reliable range.
After the step S2000, a step S3000 is performed to determine whether the variation of the voltage of the shift fork per unit time reaches a variation threshold.
Step S3000 specifically includes the following steps:
acquiring a first shifting fork voltage of a position of a shifting fork when a command pressure and a pushing command flow are given;
acquiring a second shifting fork voltage of the shifting fork after the shifting fork gives a command pressure and pushes a command flow for 1 second;
determining the variable quantity of the voltage of the shifting fork according to the first shifting fork voltage and the second shifting fork voltage;
and judging whether the variation is larger than a variation threshold.
Then, if the variation is larger than the variation threshold, step S4000 is performed, and the number of times of the dead zone reduction counter is increased by one.
Then, if the variation is smaller than the variation threshold, step S4001 is performed to increment the number of times of the dead zone expansion counter by one.
It can be understood that if the variation is greater than the variation threshold, the shift fork moves in the shift direction by more than a certain deviation, which indicates that the shift flow valve is turned on, and counts once, and the dead zone reduction counter CountUp + 1, and if the variation is less than the variation threshold, the shift fork does not move, or moves in the shift-out direction by more than a certain deviation, which indicates that the shift flow valve is not turned on or turned on reversely, and counts once, and the dead zone expansion counter CountDown + 1.
Step S4000 is followed by step S5000 of determining whether the number of times of the dead zone reduction counter reaches a dead zone reduction number threshold, in the embodiment of the present application, the dead zone reduction number threshold is set to 5, that is, after the dead zone reduction counter reaches 5 times, step S6000 is performed, and the corrected upper boundary current is determined according to the current upper boundary current. If the number of times of the dead zone reduction counter has not reached 5 times, the process returns to step S2000.
Step S5001 is executed after step S4001, and it is determined whether the number of times of the dead zone expansion counter reaches a dead zone expansion number threshold, in this embodiment, the dead zone expansion number threshold is set to 7, that is, after the number of times of the dead zone expansion counter reaches 7 times, step S6000 is executed, and the corrected upper boundary current is determined according to the current upper boundary current. If the number of times of the dead zone expansion counter has not reached 7 times, the process returns to step S2000.
The dead zone expansion time threshold is larger than the dead zone reduction time threshold, namely, the learning of the dead zone range expansion is more difficult to trigger than the learning of the dead zone range reduction, thereby effectively ensuring the reliability of the system.
Specifically, step S6000 executed after step S5000 includes: adding a learning step length as a corrected upper boundary current to the current upper boundary current; the dead zone reduction counter is cleared as the corrected boundary current. One learning step in this embodiment is set to 10 mA.
Step S6000 performed after step S5001 includes: reducing the current upper boundary current by one learning step as a corrected upper boundary current; and clearing the dead zone expansion counter.
Preferably, step S6000 is followed by a verification step, so as to effectively ensure the reliability of the system. After step S6000, step S7000 is performed to determine whether the corrected upper boundary current is within the physical range of the middle dead zone. It should be noted that the middle dead zone physical range is a statistical value of the output current of the shift flow valve detected through multiple offline. In the embodiment of the application, the median dead zone physical range is set to 0.4A-1A.
If the corrected upper boundary current is within the physical range of the middle dead zone, step S8000 is performed, and the current upper boundary current is updated according to the corrected upper boundary current, that is, the current corrected upper boundary current is used as the current upper boundary current in the next correction method step. After step S8000, step S9000 ends the correction.
If the determination structure in step S7000 is that the correction upper boundary current is not in the neutral dead zone physical range, and it is described that the dead zone upper boundary value of the shift flow valve cannot be corrected, step S9000 is executed.
According to the method for correcting the dead zone boundary current of the gear shifting flow valve, the correction condition is judged according to the acceleration of the output shaft of the vehicle, the oil temperature of the transmission and the accumulated gear shifting times, the influence on the normal working condition running of the whole vehicle due to frequent triggering of self-learning of the dead zone range can be avoided, a dead zone reduction and dead zone expansion counting mechanism is introduced, the correction boundary current is determined according to the current boundary current after the updating condition is met, the method is closer to the actual physical characteristic, and the method has the advantages of small influence on the system, safety and reliability.
Example three:
the embodiment provides a shift flow valve dead zone boundary current correction device, as shown in fig. 4, the device includes a correction condition judgment module 101, a twice pushing-in module 102, a variation judgment module 103, a counting module 104, a counter number judgment module 105, and a correction module 106.
Specifically, the correction condition judgment module 101 is configured to judge whether a correction condition is met according to vehicle output shaft acceleration, transmission oil temperature and accumulated shift times after a shift fork is engaged;
a twice pushing module 102, configured to push the shifting fork twice if yes;
a variation judging module 103, configured to judge whether a variation of a voltage of the shift fork in a unit time reaches a variation threshold;
a counting module 104, configured to increment, if yes, the dead zone reduction counter by one, and otherwise increment, the dead zone expansion counter by one;
a counter number judging module 105 for judging whether the number of times of the dead zone reduction counter reaches a dead zone reduction number threshold or judging whether the number of times of the dead zone expansion counter reaches a dead zone expansion number threshold;
and a correction module 106, configured to obtain a corrected boundary current according to the current boundary current if yes.
The device for correcting the dead zone boundary current of the gear shifting flow valve provided by the embodiment judges the correction condition according to the acceleration of the output shaft of the vehicle, the oil temperature of the transmission and the accumulated gear shifting times, can avoid the influence on the normal working condition running of the whole vehicle due to frequent triggering of self-learning of the dead zone range, introduces a dead zone reduction and dead zone expansion counting mechanism, determines the correction boundary current according to the current boundary current after the update condition is met, is closer to the actual physical characteristic, and has the advantages of small influence on the system, safety and reliability.
Example four:
the present embodiments provide an apparatus comprising a memory and a processor; at least one program stored in the memory for execution by the processor to perform the corresponding aspects of the foregoing method embodiments, compared to the prior art, may implement: the correction condition is judged according to the acceleration of the output shaft of the vehicle, the oil temperature of the transmission and the accumulated gear shifting times, the influence on the normal working condition running of the whole vehicle due to frequent triggering dead zone range self-learning can be avoided, a dead zone reduction and dead zone expansion counting mechanism is introduced, the correction boundary current is determined according to the current boundary current after the update condition is met, the correction boundary current is closer to the actual physical characteristic, and the correction method has the advantages of small influence on a system, safety and reliability.
In an alternative embodiment, an electronic device is provided, as shown in fig. 5, the electronic device 4000 comprising: a processor 4001 and a memory 4003. Processor 4001 is coupled to memory 4003, such as via bus 4002. Optionally, the electronic device 4000 may further comprise a transceiver 4004. In addition, the transceiver 4004 is not limited to one in practical applications, and the structure of the electronic device 4000 is not limited to the embodiment of the present application.
The Processor 4001 may be a CPU (Central Processing Unit), a general-purpose Processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array) or other Programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor 4001 may also be a combination that performs a computational function, including, for example, a combination of one or more microprocessors, a combination of a DSP and a microprocessor, or the like.
The Memory 4003 may be a ROM (Read Only Memory) or other types of static storage devices that can store static information and instructions, a RAM (random access Memory) or other types of dynamic storage devices that can store information and instructions, an EEPROM (Electrically Erasable Programmable Read Only Memory), a CD-ROM (Compact Disc Read Only Memory) or other optical Disc storage, optical Disc storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), a magnetic Disc storage medium or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to these.
The memory 4003 is used for storing application codes for executing the scheme of the present application, and the execution is controlled by the processor 4001. Processor 4001 is configured to execute application code stored in memory 4003 to implement what is shown in the foregoing method embodiments.
Example five:
the present embodiment provides a medium on which a computer program is stored, which, when run on a computer, enables the computer to perform the corresponding content in the foregoing method embodiments. Compared with the prior art, the method can realize that: the correction condition is judged according to the acceleration of the output shaft of the vehicle, the oil temperature of the transmission and the accumulated gear shifting times, the influence on the normal working condition running of the whole vehicle due to frequent triggering dead zone range self-learning can be avoided, a dead zone reduction and dead zone expansion counting mechanism is introduced, the correction boundary current is determined according to the current boundary current after the update condition is met, the correction boundary current is closer to the actual physical characteristic, and the correction method has the advantages of small influence on a system, safety and reliability.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (13)
1. A method for correcting the boundary current of the dead zone of a shift flow valve is characterized by comprising the following steps:
after the shifting fork is shifted, judging whether a correction condition is met or not according to the acceleration of the output shaft of the vehicle, the oil temperature of the transmission and the accumulated gear shifting times;
if yes, pushing in the shifting fork twice;
judging whether the voltage variation of the shifting fork in unit time reaches a variation threshold value;
if so, adding one to the dead zone reduction counter number, and if not, adding one to the dead zone expansion counter number;
judging whether the number of times of the dead zone reduction counter reaches a dead zone reduction number threshold or judging whether the number of times of the dead zone expansion counter reaches a dead zone expansion number threshold;
and if so, determining the corrected boundary current according to the current boundary current.
2. The shift flow valve dead band boundary current modification method of claim 1, wherein after completion of the shift fork engagement, comprising:
in the driving process, the shifting fork is shifted and then collides with the wall to rebound after preset time.
3. The shift flow valve dead zone boundary current correction method of claim 1, wherein the determining whether a correction condition is satisfied based on vehicle output shaft acceleration, transmission oil temperature, and cumulative shift times comprises:
judging whether the acceleration of the output shaft of the vehicle is smaller than an acceleration threshold value or not;
judging whether the transmission system has no fault;
judging whether the oil temperature of the transmission is within a preset temperature range or not;
judging whether the accumulated gear shifting times reach preset times or not;
if yes, judging that the correction condition is met.
4. The shift flow valve dead band boundary current modification method of claim 3, wherein said determining whether the accumulated number of shifts reaches a preset number comprises:
if the accumulated number of gear shifts reaches 104N to 104When the value is between N +1000, N is a natural number, and the accumulated gear shifting times is judged to reach the preset valueThe number of times.
5. The shift flow valve dead band boundary current modification method of claim 3, wherein the twice pushing the fork comprises:
determining a pushing command pressure of the shifting fork according to the oil temperature of the transmission;
and determining the pushing command flow of the shifting fork according to the current dead zone boundary current and the fixed current offset value.
6. The method of modifying a shift flow valve dead band boundary current of claim 5, wherein said determining whether a change in a voltage of the fork per unit time reaches a change threshold comprises:
acquiring a first fork voltage of a position of the fork when the command pressure and the push command flow are given;
acquiring a second shifting fork voltage of the shifting fork after the shifting fork gives the command pressure and the push command flow per unit time length;
determining a variation amount of a voltage of the shift fork according to the first shift fork voltage and the second shift fork voltage;
and judging whether the variation is larger than the variation threshold value.
7. The shift flow valve dead band boundary current modification method of claim 6, wherein the dead band reduction times threshold is less than the dead band expansion times threshold.
8. The shift flow valve dead band boundary current modification method of claim 7, wherein determining a modified boundary current based on a present boundary current comprises:
when the number of times of the dead zone reduction counter reaches the threshold of the number of times of dead zone reduction, the current boundary current is increased by a learning step length to be used as the corrected boundary current, or when the number of times of the dead zone expansion counter reaches the threshold of the number of times of dead zone expansion, the current boundary current is decreased by the learning step length to be used as the corrected boundary current;
and correspondingly clearing the dead zone reduction counter or the dead zone expansion counter.
9. The shift flow valve dead band boundary current modification method of claim 1, wherein determining a modified boundary current based on a present boundary current thereafter comprises:
judging whether the corrected boundary current is in a physical range of a middle dead zone;
if yes, updating the current boundary current according to the corrected boundary current;
and finishing the correction.
10. The shift flow valve dead band boundary current modification method of claim 1, wherein if the modified boundary current is not within a neutral dead band physical range, ending the modification.
11. A shift flow valve dead band boundary current modification apparatus, comprising:
the correction condition judgment module is used for judging whether the correction condition is met or not according to the acceleration of the output shaft of the vehicle, the oil temperature of the transmission and the accumulated gear shifting times after the shifting fork is put into gear;
the twice pushing module is used for pushing the shifting fork twice if the shifting fork is in the first state;
the variable quantity judging module is used for judging whether the variable quantity of the voltage of the shifting fork in unit time reaches a variable quantity threshold value or not;
the counting module is used for adding one to the dead zone reduction counter number if the dead zone reduction counter is in the positive state, and adding one to the dead zone expansion counter number if the dead zone reduction counter is in the negative state;
the counter number judging module is used for judging whether the number of times of the dead zone reduction counter reaches a dead zone reduction number threshold or judging whether the number of times of the dead zone expansion counter reaches a dead zone expansion number threshold;
and the correction module is used for obtaining the corrected boundary current according to the current boundary current if the current boundary current is correct.
12. An apparatus comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor when executing the computer program implements a shift flow valve dead band boundary current modification method as set forth in any one of claims 1 to 10.
13. A medium storing computer instructions that cause a computer to perform a shift flow valve dead band boundary current modification method as claimed in any one of claims 1 to 10.
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