CN111779828B - Gear control method and device during power supply abnormity and gear shifting system - Google Patents

Gear control method and device during power supply abnormity and gear shifting system Download PDF

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Publication number
CN111779828B
CN111779828B CN202010626369.9A CN202010626369A CN111779828B CN 111779828 B CN111779828 B CN 111779828B CN 202010626369 A CN202010626369 A CN 202010626369A CN 111779828 B CN111779828 B CN 111779828B
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Prior art keywords
gear
signal
control unit
vehicle
power supply
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CN111779828A (en
Inventor
王明玉
王歆誉
狄忠举
李洪涛
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FAW Group Corp
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FAW Group Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/68—Inputs being a function of gearing status
    • F16H59/70—Inputs being a function of gearing status dependent on the ratio established
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H2061/005—Supply of electric power, e.g. batteries for back up supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
    • F16H2061/1256—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected
    • F16H2061/1292—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected the failing part is the power supply, e.g. the electric power supply

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Transmission Device (AREA)

Abstract

The embodiment of the invention discloses a gear control method and device and a gear shifting system during abnormal power supply, wherein the gear control method during abnormal power supply comprises the following steps: acquiring a gear signal and a gear shifting signal; when power supply is abnormal and power supply is recovered after power loss, if the gear corresponding to the gear shift signal is a non-P gear, the gear shift signal is obtained again according to the state of the gear shift signal; and controlling the gear of the vehicle transmission according to the newly acquired gear shifting signal. The gear control method, the gear control device and the gear shifting system in power supply abnormality provided by the embodiment of the invention can effectively prevent the danger of vehicle accidents caused by the fact that a user drives a vehicle to run at a high speed to control the gear of a vehicle transmission to be neutral when the power supply abnormality occurs, and improve the safety of the user in driving the vehicle.

Description

Gear control method and device during power supply abnormity and gear shifting system
Technical Field
The embodiment of the invention relates to a gear control technology, in particular to a gear control method and device and a gear shifting system during power supply abnormity.
Background
In the running process of a vehicle, if a power supply failure occurs in a gear shifting system, for example, when an electronic gear shifter control unit or a transmission control unit in the gear shifting system is powered on again due to abnormal power loss of the power supply, a gear signal and a gear shifting signal of the vehicle need to be confirmed again to control the vehicle, so that the gear signal needs to be identified to ensure the running safety of the vehicle when the gear shifting system fails.
At present, in the existing gear control method, when a power supply failure occurs in a gear shifting system, the gear of a vehicle transmission is usually directly controlled to be neutral, and if the vehicle is in a high-speed driving state at this time, a risk of vehicle accidents may exist, so that the driving safety of the vehicle is affected.
Disclosure of Invention
The embodiment of the invention provides a gear control method and device and a gear shifting system during power supply abnormality, which are used for effectively preventing the danger of vehicle accidents caused by the fact that a user drives a vehicle to run at a high speed to control the gear of a vehicle transmission to be neutral when the power supply abnormality occurs, and improving the safety of the user in driving the vehicle.
In a first aspect, an embodiment of the present invention provides a gear control method in case of power supply abnormality, including:
acquiring a gear signal and a gear shifting signal; the gear signal is an actual gear signal of a vehicle transmission, and the gear shift signal is a gear signal of an electronic gear shifter;
when power supply is abnormal and power supply is recovered after power loss, if the gear corresponding to the gear shift signal is a non-P gear, the gear shift signal is obtained again according to the state of the gear shift signal;
and controlling the gear of the vehicle transmission according to the newly acquired gear shifting signal.
Optionally, controlling the gear of the vehicle transmission according to the retrieved gear shift signal comprises:
and if the gear signal corresponds to a gear position and the gear position corresponding to the newly acquired gear shifting signal is the gear position corresponding to the gear signal, controlling the gear of the vehicle transmission to be changed into the gear position corresponding to the newly acquired gear shifting signal.
Optionally, controlling the gear of the vehicle transmission according to the retrieved gear shift signal comprises:
if the gear signal corresponds to a non-gear position, acquiring the current speed of the vehicle;
and if the current vehicle speed is greater than the preset vehicle speed threshold value, controlling the gear of the vehicle transmission to be changed into a neutral gear, and sending a fault prompt that the gear shifting signal is an unknown gear signal.
Optionally, after obtaining the current vehicle speed of the vehicle, the method further includes:
and if the current vehicle speed is less than the preset vehicle speed threshold value, controlling the gear of the vehicle transmission to be changed into a neutral gear, and sending a prompt that the gear shifting signal is a neutral gear signal.
Optionally, after acquiring the gear signal and the gear shift signal, the method further includes:
and when power supply is abnormal and power supply is recovered after power loss, if the gear corresponding to the gear shift signal is the P gear, controlling the gear of the vehicle transmission to be shifted to the P gear.
Optionally, if the gear signal corresponds to the gear position, the corresponding gear position is a P gear, an R gear, an N gear, or a D gear.
In a second aspect, an embodiment of the present invention further provides a shift position control device in case of power supply abnormality, including:
the signal acquisition module is used for acquiring a gear signal and a gear shifting signal; the gear signal is an actual gear signal of a vehicle transmission, and the gear shift signal is a gear signal of an electronic gear shifter;
the gear determining module is used for acquiring the gear shifting signal again according to the state of the gear shifting signal if the gear corresponding to the gear shifting signal is a non-P gear when power supply is abnormal and power is lost and power supply is recovered;
and the gear control module is used for controlling the gear of the vehicle transmission according to the newly acquired gear shifting signal.
In a third aspect, embodiments of the present invention also provide a gear shift system, including: an electronic shifter control unit and a transmission control unit, the electronic shifter control unit being electrically connected to the transmission control unit, the gear control device according to the second aspect being integrated in the electronic shifter control unit.
Optionally, the electronic shifter control unit communicates with the transmission control unit through a CAN bus, and when the transmission control unit is powered abnormally and is powered off and then is powered back, the transmission control unit is configured to acquire a gear shift signal of the electronic shifter control unit and control a gear of the vehicle transmission according to the gear shift signal.
Optionally, the automatic transmission further comprises a P gear position sensor and a P gear actuator, and the P gear position sensor and the P gear actuator are both electrically connected with the electronic shifter control unit.
The embodiment of the invention provides a gear control method and device and a gear shifting system during power supply abnormity. According to the gear control method, the gear control device and the gear shifting system during power supply abnormality and power failure, when power supply is recovered after power supply abnormality and power failure, if the gear corresponding to the gear shifting signal is not the P gear, the gear shifting signal is obtained again according to the state of the gear shifting signal, so that the gear of the vehicle transmission is controlled according to the obtained gear shifting signal, and the condition that the gear of the vehicle transmission is directly controlled to be neutral is avoided. Compared with the existing gear control method, the embodiment of the invention can effectively prevent the danger of vehicle accidents caused by that a user drives the vehicle to run at high speed to control the gear of the vehicle transmission to be neutral when the power supply is abnormal, and improves the safety of the user in driving the vehicle.
Drawings
Fig. 1 is a flowchart of a method for controlling gear shift during abnormal power supply according to an embodiment of the present invention;
fig. 2 is a flowchart of a gear control method in case of abnormal power supply according to a second embodiment of the present invention;
fig. 3 is a block diagram of a shift control device in case of abnormal power supply according to a third embodiment of the present invention;
FIG. 4 is a block diagram of a shift system according to a fourth embodiment of the present invention;
fig. 5 is a flowchart of a gear control method in case of abnormal power supply according to a fourth embodiment of the present invention;
fig. 6 is a flowchart of another gear control method for power supply abnormality according to the fourth embodiment of the present invention;
fig. 7 is a flowchart of another method for controlling gear shift during power supply abnormality according to the fourth embodiment of the present invention.
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.
Example one
Fig. 1 is a flowchart of a method for controlling a shift position during power supply abnormality according to a first embodiment of the present invention, which is applicable to shift position control of a vehicle, and can be executed by a shift position control device during power supply abnormality, which can be integrated in an electronic shifter control unit of a shift system, and specifically includes the following steps:
step 110, acquiring a gear signal and a gear shifting signal.
The gear signal is an actual gear signal of the vehicle transmission, the gear signal is a gear signal of the electronic gear shift, the gear signal and the gear shift signal can be obtained through a transmission control unit and a P gear position sensor in a gear shift system electrically connected with the vehicle transmission respectively, and a gear control device integrated in the electronic gear shift control unit of the gear shift system when power supply is abnormal can obtain the gear signal and the gear shift signal of the vehicle transmission through an input port which is arranged on the gear control device and electrically connected with the P gear position sensor and the transmission control unit respectively, so that gear control is performed according to the gear signal and the gear shift signal of the vehicle transmission.
And step 120, when power supply is abnormal and power supply is recovered after power loss, if the gear corresponding to the gear shift signal is a non-P gear, reacquiring the gear shift signal according to the state of the gear shift signal.
Specifically, if the electronic shifter control unit has power supply abnormality and recovers power supply after power loss, whether the gear corresponding to the obtained shift signal is a P gear or not needs to be confirmed, and if the gear corresponding to the shift signal is the P gear, the gear of the vehicle transmission can be controlled to be changed into the P gear; if the gear corresponding to the gear shift signal is a non-P gear, the gear control device can reacquire the gear shift signal in the transmission control unit according to the state of the gear shift signal through an input port which is arranged on the gear control device and electrically connected with the transmission control unit, and if the gear shift signal corresponds to an R gear, the reacquired gear shift signal also corresponds to the R gear, so as to carry out gear control according to the reacquired gear shift signal.
And step 130, controlling the gear of the vehicle transmission according to the newly acquired gear shifting signal.
Specifically, whether the newly acquired gear shift signal corresponds to the gear position or not can be determined, if the newly acquired gear shift signal corresponds to the gear position, the gear of the vehicle transmission can be controlled to be changed to the gear position corresponding to the newly acquired gear shift signal, and if the newly acquired gear shift signal corresponds to the D gear, the gear of the vehicle transmission is controlled to be changed to the D gear, so that the gear of the vehicle transmission is controlled according to the newly acquired gear shift signal, the condition that the gear of the vehicle transmission is directly controlled to be in a neutral position is avoided, the danger of vehicle accidents caused by the fact that a user drives the vehicle at a high speed to control the gear of the vehicle transmission to be in the neutral position when power supply is abnormal can be effectively prevented, and the safety of the user in driving the vehicle is improved.
According to the gear control method during power supply abnormality, when power supply is recovered after power supply abnormality and power loss, if the gear corresponding to the gear shift signal is not the P gear, the gear shift signal is acquired again according to the state of the gear shift signal, so that the gear of the vehicle transmission is controlled according to the acquired gear shift signal, and the condition that the gear of the vehicle transmission is directly controlled to be neutral is avoided. Compared with the existing gear control method, the embodiment of the invention can effectively prevent the danger of vehicle accidents caused by that a user drives the vehicle to run at high speed to control the gear of the vehicle transmission to be neutral when the power supply is abnormal, and improves the safety of the user in driving the vehicle.
Example two
Fig. 2 is a flowchart of a power supply abnormality gear control method according to a second embodiment of the present invention, which is based on the first embodiment, and is applicable to gear control of a vehicle, and the method can be executed by a power supply abnormality gear control device, which can be integrated in an electronic shifter control unit of a gear shifting system, and specifically includes the following steps:
step 210, acquiring a gear signal and a gear shifting signal.
The gear signal is an actual gear signal of the vehicle transmission, the gear signal is a gear signal of the electronic gear shift, the gear signal and the gear shift signal can be obtained through a transmission control unit and a P gear position sensor in a gear shift system electrically connected with the vehicle transmission respectively, and a gear control device integrated in the electronic gear shift control unit of the gear shift system when power supply is abnormal can obtain the gear signal and the gear shift signal of the vehicle transmission through an input port which is arranged on the gear control device and electrically connected with the P gear position sensor and the transmission control unit respectively, so that gear control is performed according to the gear signal and the gear shift signal of the vehicle transmission.
And step 220, when power supply is abnormal and power supply is recovered after power loss, if the gear corresponding to the gear shift signal is a non-P gear, the gear shift signal is acquired again according to the state of the gear shift signal.
Specifically, if the electronic shifter control unit has power supply abnormality and recovers power supply after power loss, whether the gear corresponding to the obtained shift signal is a P gear or not needs to be confirmed, and if the gear corresponding to the shift signal is the P gear, the gear of the vehicle transmission can be controlled to be changed into the P gear; if the gear corresponding to the gear shift signal is a non-P gear, the gear control device can reacquire the gear shift signal in the transmission control unit according to the state of the gear shift signal through an input port which is arranged on the gear control device and electrically connected with the transmission control unit, and if the gear shift signal corresponds to an R gear, the reacquired gear shift signal also corresponds to the R gear, so as to carry out gear control according to the reacquired gear shift signal.
And step 230, if the gear signal corresponds to a gear position, and the gear position corresponding to the newly acquired gear shift signal is the gear position corresponding to the gear signal, controlling the gear of the vehicle transmission to be changed into the gear position corresponding to the newly acquired gear shift signal.
When the acquired gear signal corresponds to the gear position, the corresponding gear position is P gear, R gear, N gear or D gear, and if the gear position corresponding to the newly acquired gear shift signal is the gear position corresponding to the gear signal, such as D gear, namely the gear expected by the driver, the gear of the vehicle transmission is controlled to be changed into D gear, so that the control on the gear of the vehicle transmission is realized, and the vehicle can continuously run according to the gear expected by the driver.
And 240, if the gear signal corresponds to a non-gear position, acquiring the current speed of the vehicle.
The gear control device can acquire the current speed of the vehicle through an input port which is arranged on the gear control device and electrically connected with the vehicle speed sensor, so that the gear is controlled according to the current speed of the vehicle.
And step 250, if the current vehicle speed is greater than a preset vehicle speed threshold value, controlling the gear of the vehicle transmission to be changed into a neutral gear, and sending a fault prompt that a gear shifting signal is an unknown gear signal.
Specifically, if the current vehicle speed is greater than the preset vehicle speed threshold value of 3K m/h, the gear of the vehicle transmission is controlled to be changed into a neutral gear, and a fault prompt that the gear shift signal is an unknown gear signal is sent, namely the gear is not displayed on an instrument of the vehicle, so that the fault of the gear shift signal is prompted to a driver.
It should be noted that the preset vehicle speed threshold may be specifically set according to actual conditions, and is not limited herein.
And step 260, if the current vehicle speed is less than the preset vehicle speed threshold value, controlling the gear of the vehicle transmission to be changed into a neutral gear, and sending a prompt that the gear shifting signal is a neutral gear signal.
Specifically, if the current vehicle speed is less than the preset vehicle speed threshold value of 3K m/h, the gear of the vehicle transmission is controlled to be changed into the neutral gear, and the neutral gear is displayed on the instrument of the vehicle when the gear shift signal is the neutral gear signal, so that the driver is prompted to change the gear of the vehicle transmission into the neutral gear.
In the gear control method during power supply abnormality provided in this embodiment, when power supply is restored after power supply abnormality and power loss, if the gear corresponding to the shift signal is a non-P gear, the shift signal is acquired again according to the state of the gear signal, if the gear signal corresponds to the gear position, the gear position corresponding to the acquired shift signal is the gear position corresponding to the gear signal, the gear of the vehicle transmission is controlled to be changed to the gear position corresponding to the acquired shift signal, and if the gear signal corresponds to a non-gear position, the gear is controlled according to the current vehicle speed of the vehicle, so that the gear of the vehicle transmission is prevented from being directly controlled to a neutral position. Compared with the existing gear control method, the embodiment of the invention can effectively prevent the danger of vehicle accidents caused by that a user drives the vehicle to run at high speed to control the gear of the vehicle transmission to be neutral when the power supply is abnormal, and improves the safety of the user in driving the vehicle.
EXAMPLE III
Fig. 3 is a block diagram of a gear control device during abnormal power supply according to a third embodiment of the present invention, where the gear control device includes a signal acquisition module 310, a gear determination module 320, and a gear control module 330; the signal acquiring module 310 is configured to acquire a gear signal and a gear shift signal; the gear signal is an actual gear signal of a vehicle transmission, and the gear shift signal is a gear signal of an electronic gear shifter; the gear determining module 320 is configured to, when power supply is abnormal and power is lost and power is restored, if a gear corresponding to the gear shift signal is a non-P gear, reacquire the gear shift signal according to a state of the gear shift signal; the gear control module 330 is used to control the gears of the vehicle transmission based on the retrieved shift signal.
On the basis of the above embodiment, the gear control module 330 includes a first gear control unit, configured to control the gear of the vehicle transmission to be changed to the gear position corresponding to the reacquired shift signal if the gear signal corresponds to the gear position and the gear position corresponding to the reacquired shift signal is the gear position corresponding to the gear signal.
In one embodiment, the gear control module 330 includes a vehicle speed obtaining unit and a second gear control unit, where the vehicle speed obtaining unit is configured to obtain a current vehicle speed of the vehicle if the gear signal corresponds to a no-gear position; and the second gear control unit is used for controlling the gear of the vehicle transmission to be changed into a neutral gear and sending a fault prompt that the gear shift signal is an unknown gear signal if the current vehicle speed is greater than a preset vehicle speed threshold value.
Preferably, the gear control module 330 includes a third gear control unit, configured to control the gear of the vehicle transmission to be changed to a neutral gear if the current vehicle speed is less than a preset vehicle speed threshold, and to issue a prompt that the shift signal is a neutral gear signal.
Preferably, the gear determining module 320 includes a fourth gear control unit, configured to, when power supply is abnormal and power is lost and power is restored, control the gear of the vehicle transmission to shift to the P gear if the gear corresponding to the shift signal is the P gear.
The gear control device in the power supply abnormality provided by the embodiment has the corresponding beneficial effects of the gear control method in the power supply abnormality.
Example four
Fig. 4 is a block diagram of a gear shift system according to a fourth embodiment of the present invention, where the gear shift system includes: an electronic shifter control unit 10 and a transmission control unit 20, the electronic shifter control unit 10 being electrically connected to the transmission control unit 20, the gear control device 11 as described in the third embodiment being integrated in the electronic shifter control unit 10.
Wherein the gear shift system is provided on the vehicle, the electronic shifter control unit 10 and the transmission control unit 20 are both electrically connected to the vehicle transmission 30, the gear position of the vehicle transmission 30 is controlled by the gear shift system, and the gear position of the vehicle transmission 30 can be displayed on the meter 40 electrically connected to the transmission control unit 20.
Optionally, the electronic shifter control unit 10 communicates with the transmission control unit 20 through a CAN bus, and when the transmission control unit 20 recovers power supply after power supply abnormality and power loss occurs, the transmission control unit 20 is configured to acquire a shift signal of the electronic shifter control unit 10 and control a gear of a vehicle transmission according to the shift signal.
The electronic shifter control unit 10 and the transmission control unit 20 can transmit gear signals to each other, the electronic shifter control unit 10 controls the gear of the vehicle transmission through the transmission control unit 20, and when power supply abnormality occurs and power is lost in the transmission control unit 20 and then power supply is recovered, the transmission control unit 20 acquires the gear shifting signal in the electronic shifter control unit 10 and controls the gear of the vehicle transmission according to the gear shifting signal, so that control over the gear of the vehicle transmission is achieved through the electronic shifter control unit 10 and the transmission control unit 20.
Optionally, the gear shifting system further includes a P-range position sensor 50 and a P-range actuator 60, and both the P-range position sensor 50 and the P-range actuator 60 are electrically connected to the electronic shifter control unit 10.
Specifically, the electronic shifter control unit 10 is electrically connected to the vehicle transmission 30 through a P range position sensor 50 and a P range actuator 60, the electronic shifter control unit 10 acquires a range signal of the vehicle transmission 30 through the P range position sensor 50, and can determine whether the range of the vehicle transmission 30 is the P range or the non-P range according to the range signal, and the shift of the range of the vehicle transmission 30 to the P range is controlled through the P range actuator 60.
In one embodiment, fig. 5 is a flowchart of a method for controlling a gear position during power supply abnormality according to a fourth embodiment of the present invention, where when a power supply failure occurs in both the electronic shifter control unit and the transmission control unit, the specific steps of the shift system controlling the gear position of the vehicle transmission are as follows:
the method comprises the following steps: the electronic shifter control unit identifies a gear of the vehicle transmission through a P-range position sensor.
The electronic shifter control unit is electrically connected with the vehicle transmission through a P gear position sensor, and the gear of the vehicle transmission is determined to be P gear or non-P gear through the P gear position sensor.
Step two: when the identified gear of the vehicle transmission is a non-P gear, the electronic shifter control unit identifies a gear signal fed back by the transmission control unit.
Specifically, the electronic shifter control unit identifies the gear signal fed back by the transmission control unit, and thus determines the gear corresponding to the gear signal, i.e., the driver's desired gear. In addition, if the identified gear position of the vehicle transmission is the P-range, the electronic shifter control unit controls the gear position of the vehicle transmission to be the P-range.
Step three: and when the identified gear signal corresponds to a non-gear position, if the current vehicle speed of the vehicle is greater than a preset vehicle speed threshold value, the electronic gear shifter control unit controls the gear of the vehicle transmission to be neutral and sends out a prompt of gear signal failure.
Specifically, the identified gear signal corresponds to a no-gear position, which indicates that the transmission control unit does not identify the gear signal, the electronic gear shift control unit can acquire the current vehicle speed of the vehicle through the vehicle speed sensor, and if the current vehicle speed is greater than a preset vehicle speed threshold value of 3Km/h, the electronic gear shift control unit can determine that the identified gear signal is an unknown gear signal. The electronic gear shifter control unit controls the gear of the vehicle transmission to be changed into a neutral gear through the transmission control unit and controls the instrument not to display the gear, namely the instrument does not display the gear to prompt a driver of a gear signal fault. In addition, when the identified gear signal corresponds to a gear position, the electronic shifter control unit controls the gear of the vehicle transmission to be shifted to the gear position corresponding to the gear signal according to the gear signal.
It should be noted that the preset vehicle speed threshold may be specifically set according to actual conditions, and is not limited herein.
Step four: and if the current vehicle speed of the vehicle is less than the preset vehicle speed threshold value, the electronic gear shift control unit controls the gear of the vehicle transmission to be neutral.
If the current vehicle speed is less than the preset vehicle speed threshold value of 3Km/h, the electronic gear shift control unit can determine that the identified gear signal is a neutral gear signal, and the electronic gear shift control unit controls the gear of the vehicle transmission to be changed into a neutral gear through the transmission control unit and controls the instrument to display the neutral gear. In one power-on process, after the electronic shifter control unit and the transmission control unit recognize a valid gear signal once, when communication faults of the electronic shifter control unit and the transmission control unit occur again, fault processing of the gear signal by the electronic shifter control unit or the transmission control unit maintains the valid value of the gear signal at the moment before the fault occurs.
Fig. 6 is a flowchart of another method for controlling gears in power supply abnormality according to a fourth embodiment of the present invention, in which when a power supply failure occurs in the electronic shifter control unit, the specific steps of the gear shifting system controlling the gears of the vehicle transmission are as follows:
the method comprises the following steps: the electronic shifter control unit and the transmission control unit identify a gear signal.
The electronic shifter control unit and the transmission control unit identify the gear signal of the vehicle transmission, namely the gear signal expected by the driver, and if the vehicle runs at a high speed in the D gear, the gear corresponding to the gear signal expected by the driver is the D gear.
Step two: judging whether the control unit of the electronic gear shifter is powered on again after power failure; if yes, executing the step three; if not, returning to the step one.
Step three: if the gear identified by the electronic shifter control unit through the P-gear position sensor is not the P-gear, the electronic shifter control unit receives a gear signal sent by the transmission control unit.
Specifically, in the power-on process of the electronic shifter control unit, when the P gear position sensor detects that the gear of the vehicle transmission is a non-P gear, the gear signal of the transmission control unit is identified, so that the gear is controlled according to the gear signal of the transmission control unit.
Step four: the electronic shifter control unit controls a gear of the vehicle transmission according to the received gear signal when the received gear signal is a valid gear signal.
If the gear of the vehicle transmission corresponding to the effective gear signal is the D gear, the electronic gear shifter control unit can control the gear of the vehicle transmission to be the D gear through the transmission control unit according to the received gear signal, namely when the vehicle runs at the high speed of the D gear, even if the electronic gear shifter control unit has power supply failure, the gear shifting system can still control the gear of the vehicle transmission according to the gear signal expected by a driver.
Fig. 7 is a flowchart of another method for controlling a gear position during power supply abnormality according to a fourth embodiment of the present invention, where when a power supply failure occurs in a transmission control unit, a gear shift system controls a gear position of a vehicle transmission in the following specific steps:
the method comprises the following steps: the electronic shifter control unit and the transmission control unit identify a gear signal.
Step two: judging whether the transmission control unit is powered on or not; if yes, executing the step three; if not, returning to the step one.
Step three: the transmission control unit receives a gear signal sent by the electronic shifter control unit.
Step four: when the received gear signal is a valid gear signal, the transmission control unit controls the gear of the vehicle transmission according to the received gear signal.
The effective gear signals correspond to gear positions, if the gear of the vehicle transmission corresponding to the effective gear signals is a D gear, the transmission control unit can control the gear of the vehicle transmission to be the D gear according to the received gear signals, namely when the vehicle runs at the high speed of the D gear, even if the transmission control unit has power supply failure, the gear shifting system can still control the gear of the vehicle transmission according to the gear signals expected by a driver.
In addition, when the gear shifting system cannot identify a valid gear signal, the transmission control unit controls the gear of the vehicle transmission to be neutral and controls the instrument not to display the gear so as to prompt a driver that the vehicle has a gear signal fault.
In conclusion, when the electronic gear shifter control unit is restarted due to the power supply abnormality, the electronic gear shifter control unit identifies the current gear information by combining the gear signal of the transmission control unit, and the gear shifting system can work normally; when the system is restarted due to power supply abnormality of the transmission control unit, the transmission control unit continuously controls the transmission according to the gear signal of the electronic shifter control unit, and the gear shifting system can work normally. When any one of the electronic gear shift control unit and the transmission control unit is abnormal in power supply, accurate control over the gear of the vehicle transmission can be achieved through redundancy of the other gear signal, the high-speed running working condition of the vehicle is avoided, power interruption of the whole vehicle due to power supply failure of a gear shifting system is avoided, and safety of the vehicle is improved.
The gear shifting system provided by the embodiment has the corresponding beneficial effects of the gear control method in the case of abnormal power supply.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (6)

1. A gear control method in power supply abnormality is characterized by comprising the following steps:
acquiring a gear signal and a gear shifting signal; the gear signal is an actual gear signal of a vehicle transmission, and the gear signal is a gear shifting signal of an electronic gear shifter;
when power supply is abnormal and power supply is recovered after power loss, if the gear corresponding to the gear shift signal is a non-P gear, the gear shift signal is obtained again according to the state of the gear shift signal;
controlling a gear of the vehicle transmission according to the retrieved gear shift signal;
wherein controlling the gear of the vehicle transmission according to the reacquired shift signal comprises:
if the gear signal corresponds to a gear position, and the gear position corresponding to the newly acquired gear shift signal is the gear position corresponding to the gear signal, controlling the gear of the vehicle transmission to be changed into the gear position corresponding to the newly acquired gear shift signal;
if the gear signal corresponds to a non-gear position, acquiring the current speed of the vehicle;
if the current vehicle speed is greater than a preset vehicle speed threshold value, controlling the gear of the vehicle transmission to be changed into a neutral gear, and sending a fault prompt that a gear shifting signal is an unknown gear signal;
wherein, after obtaining the current speed of vehicle, still include:
if the current vehicle speed is less than a preset vehicle speed threshold value, controlling the gear of the vehicle transmission to be changed into a neutral gear, and sending a prompt that a gear shifting signal is a neutral gear signal;
the gear signal corresponds to a gear position, and the corresponding gear position is a P gear, an R gear, an N gear or a D gear.
2. The gear control method according to claim 1, characterized by further comprising, after acquiring the gear signal and the shift signal:
and when power supply is abnormal and power supply is recovered after power loss, if the gear corresponding to the gear shifting signal is the P gear, controlling the gear of the vehicle transmission to be shifted to the P gear.
3. A shift position control device in the case of power supply abnormality, characterized by comprising:
the signal acquisition module is used for acquiring a gear signal and a gear shifting signal; the gear signal is an actual gear signal of a vehicle transmission, and the gear signal is a gear shifting signal of an electronic gear shifter;
the gear determining module is used for acquiring a gear shifting signal again according to the state of the gear shifting signal if the gear corresponding to the gear shifting signal is a non-P gear when power supply is abnormal and power is lost and power supply is recovered;
a gear control module for controlling a gear of the vehicle transmission according to the retrieved gear shift signal;
the gear control module comprises a first gear control unit, and is used for controlling the gear of the vehicle transmission to be changed into the gear position corresponding to the gear signal obtained again if the gear signal corresponds to the gear position and the gear position corresponding to the gear signal obtained again is the gear position corresponding to the gear signal;
the gear control module comprises a vehicle speed acquisition unit and a second gear control unit, wherein the vehicle speed acquisition unit is used for acquiring the current vehicle speed of the vehicle if the gear signal corresponds to a non-gear position; the second gear control unit is used for controlling the gear of the vehicle transmission to be changed into a neutral gear and sending a fault prompt that a gear shift signal is an unknown gear signal if the current vehicle speed is greater than a preset vehicle speed threshold;
the gear control module comprises a third gear control unit, and is used for controlling the gear of the vehicle transmission to be changed into a neutral gear and sending a prompt that a gear shift signal is a neutral gear signal if the current vehicle speed is less than a preset vehicle speed threshold;
the gear signal corresponds to a gear position, and the corresponding gear position is a P gear, an R gear, an N gear or a D gear.
4. A gear shift system, comprising: an electronic shifter control unit and a transmission control unit, the electronic shifter control unit being electrically connected to the transmission control unit, the gear control device of claim 3 being integrated into the electronic shifter control unit.
5. The gear shifting system of claim 4, wherein the electronic shifter control unit communicates with the transmission control unit via a CAN bus, and the transmission control unit is configured to obtain the gear shifting signal of the electronic shifter control unit and control the gear of the vehicle transmission according to the gear shifting signal when the power supply of the transmission control unit is restored after power failure due to power failure.
6. The gear shifting system of claim 4, further comprising a P range position sensor and a P range actuator, both of which are electrically connected to the electronic shifter control unit.
CN202010626369.9A 2020-07-01 2020-07-01 Gear control method and device during power supply abnormity and gear shifting system Active CN111779828B (en)

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