CN114714902A - Vehicle control method and vehicle - Google Patents

Vehicle control method and vehicle Download PDF

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Publication number
CN114714902A
CN114714902A CN202110925451.6A CN202110925451A CN114714902A CN 114714902 A CN114714902 A CN 114714902A CN 202110925451 A CN202110925451 A CN 202110925451A CN 114714902 A CN114714902 A CN 114714902A
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China
Prior art keywords
mode
vehicle
wheel
transfer case
drive
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CN202110925451.6A
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Chinese (zh)
Inventor
杨亚光
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Great Wall Motor Co Ltd
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Great Wall Motor Co Ltd
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Priority to CN202110925451.6A priority Critical patent/CN114714902A/en
Priority to PCT/CN2022/102053 priority patent/WO2023016115A1/en
Publication of CN114714902A publication Critical patent/CN114714902A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/34—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles
    • B60K17/344—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having a transfer gear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K31/00—Vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed, i.e. preventing speed from exceeding an arbitrarily established velocity or maintaining speed at a particular velocity, as selected by the vehicle operator
    • B60K31/18—Vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed, i.e. preventing speed from exceeding an arbitrarily established velocity or maintaining speed at a particular velocity, as selected by the vehicle operator including a device to audibly, visibly, or otherwise signal the existence of unusual or unintended speed to the driver of the vehicle
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
    • 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
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/40—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism comprising signals other than signals for actuating the final output mechanisms
    • F16H63/42—Ratio indicator devices
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
    • F16D2066/001—Temperature

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Arrangement And Driving Of Transmission Devices (AREA)

Abstract

The disclosure relates to a vehicle control method and a vehicle, and aims to solve the technical problem that in the related art, when a friction plate is overheated, the friction plate is opened to dissipate heat, so that the vehicle loses the four-wheel drive function. The method comprises the following steps: under the condition that a friction plate in a transfer case assembly of the vehicle is in a pressing state, judging whether the temperature of the friction plate is larger than a preset temperature threshold value or not; and under the condition that the temperature is greater than a preset temperature threshold value, controlling a mechanical locking mechanism in the transfer case assembly to enter a locking state, and controlling a transfer case transmission mechanism in the transfer case assembly to open the friction plate, wherein in the locking state, the mechanical locking mechanism locks the transfer case transmission mechanism and a wheel driving mechanism of the vehicle, so that the vehicle is in a four-wheel driving state.

Description

Vehicle control method and vehicle
Technical Field
The disclosure relates to the technical field of vehicles, in particular to a vehicle control method and a vehicle.
Background
Timely four-wheel drive is converted to four-wheel drive only when appropriate, and remains a two-wheel drive system in other cases. In the actual running process, the running road conditions need four-wheel drive, for example, when the vehicle runs on wet and icy roads and uneven roads or the wheels fall into mud pits to skid or climb, the vehicle needs larger driving force, and the front wheel and the rear wheel both need power drive to improve the passing performance of the vehicle. The transfer case is an important transmission component in a four-wheel drive vehicle, and achieves a four-wheel drive function of the vehicle by outputting transmission input torque to a front axle and a rear axle. Specifically, the transfer case realizes the four-wheel drive function by pressing the inner friction plates, but due to the limitation of the torque capacity of the friction plates, the problem of overheating of the friction plates exists when the vehicle runs on a non-paved road in the four-wheel drive mode.
In the related art, when a friction plate is overheated, the friction plate is prevented from being ablated due to overheating of the friction plate by opening a pressed friction plate for heat dissipation. However, the friction plate is opened, so that the vehicle loses the four-wheel drive function, the off-road capability of the vehicle is reduced, and even potential safety hazards are brought.
Disclosure of Invention
The invention aims to provide a vehicle control method and a vehicle, and aims to solve the technical problem that in the related art, when a friction plate is overheated, the friction plate is opened to dissipate heat, so that the vehicle loses the four-wheel drive function.
In order to achieve the above object, a first aspect of the present disclosure provides a vehicle control method including:
under the condition that a friction plate in a transfer case assembly of the vehicle is in a pressing state, judging whether the temperature of the friction plate is greater than a preset temperature threshold value or not;
and under the condition that the temperature is greater than a preset temperature threshold value, controlling a mechanical locking mechanism in the transfer case assembly to enter a locking state, and controlling a transfer case transmission mechanism in the transfer case assembly to open the friction plate, wherein in the locking state, the mechanical locking mechanism locks the transfer case transmission mechanism and a wheel driving mechanism of the vehicle, so that the vehicle is in a four-wheel drive state.
Optionally, the determining whether the temperature of the friction plate is greater than a preset temperature threshold before determining that the temperature of the friction plate is greater than a preset temperature threshold when the friction plate in the transfer case assembly of the vehicle is in a pressed state includes:
acquiring a terrain mode request signal of the vehicle;
determining a mode type corresponding to the terrain mode request signal;
under the condition that the mode type is a four-wheel drive standard mode, judging whether the temperature of the friction plate is greater than a preset temperature threshold value or not;
and under the condition that the temperature is less than or equal to a preset temperature threshold value, controlling the transfer case transmission mechanism to press a friction plate, so that the vehicle enters a four-wheel drive state.
Optionally, the method further comprises:
timing the heat dissipation time of the friction plate after controlling the transfer case transmission mechanism to open the friction plate to obtain the heat dissipation time;
and under the condition that the heat dissipation time reaches a preset time threshold, if the vehicle speed of the vehicle is greater than the preset vehicle speed threshold, controlling the transfer case transmission mechanism to press the friction plate, and controlling the mechanical locking mechanism to enter a release state.
Optionally, timing the heat dissipation duration of the friction plate includes:
in the process of timing the heat dissipation duration of the friction plate, if a flameout signal of the vehicle is received, storing the timed first duration and the occurrence time of the flameout signal; and the number of the first and second electrodes,
when the vehicle is ignited, determining a second time length according to the ignition time and the occurrence time of the flameout signal;
and taking the sum of the first duration and the second duration as the heat dissipation duration.
Optionally, the method further comprises:
and under the condition that the mode type is a four-wheel-drive mud land mode, a four-wheel-drive sand land mode, a four-wheel-drive low-speed mode or a four-wheel-drive rock mode, controlling the mechanical locking mechanism to enter a locking state, so that the vehicle enters a four-wheel-drive state.
Optionally, in the case that the mode type is a four-wheel-drive mud land mode, a four-wheel-drive sand land mode, a four-wheel-drive low-speed mode or a four-wheel-drive rock mode, the controlling the mechanical locking mechanism to enter the locked state includes:
transmitting a mode switching signal to a transmission of the vehicle in case the mode type is a four-wheel drive low speed mode or a four-wheel drive rock mode;
and after the transmission locks the neutral gear according to the mode switching signal, controlling the transmission mechanism of the transfer case to increase the torque at a low speed, and controlling the mechanical locking mechanism to enter the locking state.
Optionally, the method further comprises:
and if the mode type is a four-wheel-drive mud land mode, a four-wheel-drive sand land mode, a four-wheel-drive low-speed mode or a four-wheel-drive rock mode, if the mechanical locking mechanism fails to be controlled to enter the locking state, changing the mode type into a four-wheel-drive standard mode, and controlling the transfer case transmission mechanism to press the friction plate, so that the vehicle enters a four-wheel-drive state.
The second aspect of the present disclosure also provides a vehicle including:
the transfer case assembly comprises a transfer case controller, a transfer case transmission mechanism and a mechanical locking mechanism, wherein the transfer case controller is connected with the mechanical locking mechanism, the transfer case transmission mechanism is connected with a torque output end of a transmission of the vehicle, and the mechanical locking mechanism is used for locking the transfer case transmission mechanism and a wheel driving mechanism of the vehicle;
the transfer case controller is configured to perform the method of any of the first aspect above.
Optionally, the vehicle further comprises a body stabilizing system connected with the transfer case controller and a meter connected with the body stabilizing system;
the transfer case controller is further configured to send a drive mode feedback signal to the body stability system in response to the terrain mode request signal;
the body stabilization system is configured to:
under the condition that the driving mode feedback signal is received, judging whether the mode type of the driving mode feedback signal is matched with the mode type of the terrain mode request signal or not;
under the condition that the mode type of the driving mode feedback signal is matched with the mode type of the terrain mode request signal, controlling the instrument to display terrain mode reminding information corresponding to the mode type of the terrain mode request signal;
and controlling the meter to display information for prompting that the mode type requested by the terrain mode request signal is not entered in the case that the mode type of the driving mode feedback signal does not match the mode type of the terrain mode request signal.
Optionally, the transfer case controller is connected to the meter, the transfer case controller being further configured to send a drive mode feedback signal to the meter in response to the terrain mode request signal;
the meter is configured to:
determining a mode type of the driving mode feedback signal in case of receiving the driving mode feedback signal;
under the condition that the mode type of the driving mode feedback signal is a four-wheel-drive mud land mode, a four-wheel-drive sand land mode, a four-wheel-drive low-speed mode or a four-wheel-drive rock mode, judging whether the current vehicle speed of the vehicle is greater than a vehicle speed calibration value corresponding to the mode type;
and displaying preset vehicle speed alarm information under the condition that the current vehicle speed is greater than the vehicle speed calibration value.
Through the technical scheme, the following technical effects can be at least achieved:
under the condition that a friction plate in a transfer case assembly of a vehicle is in a pressing state, judging whether the temperature of the friction plate is larger than a preset temperature threshold value or not, and under the condition that the temperature is larger than the preset temperature threshold value, controlling a mechanical locking mechanism in the transfer case assembly to enter a locking state, and controlling a transfer case transmission mechanism in the transfer case assembly to open the friction plate, wherein under the locking state, the mechanical locking mechanism locks the transfer case transmission mechanism and a wheel driving mechanism of the vehicle, so that the vehicle is in a four-wheel drive state. By the method, when the friction plate is overheated, the friction plate is opened to dissipate heat, and meanwhile, the mechanical locking mechanism in the transfer case assembly is controlled to enter a locking state, so that the vehicle is in a four-wheel drive state, and the technical problem that the vehicle loses the four-wheel drive function due to the fact that the friction plate is opened to dissipate heat when the friction plate is overheated in the related art is solved.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a schematic flow chart diagram of a vehicle control method provided by an embodiment of the present disclosure;
FIG. 2 is a block diagram of a vehicle provided by an embodiment of the present disclosure;
FIG. 3 is a schematic illustration of a vehicle signaling provided by an embodiment of the present disclosure;
fig. 4 is a flowchart illustrating another vehicle control method according to an embodiment of the disclosure.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
It should be understood that the various steps recited in the method embodiments of the present disclosure may be performed in a different order, and/or performed in parallel. Moreover, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the present disclosure is not limited in this respect. The term "include" and variations thereof as used herein are open-ended, i.e., "including but not limited to". The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Relevant definitions for other terms will be given in the following description. It should be noted that the terms "first", "second", and the like in the present disclosure are only used for distinguishing different devices, modules or units, and are not used for limiting the order or interdependence of the functions performed by the devices, modules or units. In addition, references to "a", "an", and "the" modifications in this disclosure are intended to be illustrative rather than limiting, and one skilled in the art will appreciate that "one or more" will be understood unless the context clearly dictates otherwise.
In the related art, when the friction plate is overheated, the friction plate is prevented from being ablated due to overheating of the friction plate by opening the pressed friction plate for heat dissipation. However, the friction plate is opened, so that the vehicle loses the four-wheel drive function, the off-road capability of the vehicle is reduced, and even potential safety hazards are brought.
In view of this, the present disclosure provides a vehicle control method and a vehicle, so as to solve the technical problem in the related art that when a friction plate is overheated, the friction plate is opened to dissipate heat, so that the vehicle loses the four-wheel drive function.
The following provides a detailed description of embodiments of the present disclosure.
The disclosed embodiment provides a vehicle control method, as shown in fig. 1, the method including:
s101, under the condition that a friction plate in a transfer case assembly of the vehicle is in a pressing state, judging whether the temperature of the friction plate is larger than a preset temperature threshold value or not.
S102, controlling a mechanical locking mechanism in the transfer case assembly to enter a locking state and controlling a transfer case transmission mechanism in the transfer case assembly to open the friction plate under the condition that the temperature is greater than a preset temperature threshold value.
Wherein, in the locked state, the mechanical locking mechanism locks the transfer case transmission mechanism with a wheel drive mechanism of the vehicle such that the vehicle is in a four-wheel drive state.
By adopting the method, under the condition that the friction plate in the transfer case assembly of the vehicle is in a pressing state, whether the temperature of the friction plate is larger than a preset temperature threshold value or not is judged, and under the condition that the temperature is larger than the preset temperature threshold value, the mechanical locking mechanism in the transfer case assembly is controlled to enter a locking state, so that the mechanical locking mechanism locks the transfer case transmission mechanism and a wheel driving mechanism of the vehicle, the vehicle is in a four-wheel driving state, the transfer case transmission mechanism in the transfer case assembly is controlled to open the friction plate, and the friction plate is prevented from being overheated. By the method, when the friction plate is overheated, the friction plate is opened to dissipate heat, meanwhile, the vehicle is prevented from losing the four-wheel drive function, and the technical problem that in the related technology, the vehicle loses the four-wheel drive function due to the fact that the friction plate is opened to dissipate heat when the friction plate is overheated is solved.
In order to make the vehicle control method provided by the present disclosure more understandable to those skilled in the art, the above steps are exemplified in detail below.
It should be noted that the mode types of the terrain mode request signal of the vehicle provided by the embodiment of the present disclosure include, but are not limited to, the following four-wheel drive mode: a four-wheel drive standard mode, a four-wheel drive mud mode, a four-wheel drive sand mode, a four-wheel drive low speed mode, and a four-wheel drive rock mode. In the related art, in the four-wheel drive standard mode, the friction plate is pressed by controlling the transmission mechanism of the transfer case, so that the vehicle enters a four-wheel drive state.
Therefore, in a possible mode, in a case where a friction plate in a transfer assembly of a vehicle is in a pressed state, before determining whether a temperature of the friction plate is greater than a preset temperature threshold, the method includes: the method comprises the steps of firstly obtaining a terrain mode request signal of a vehicle, determining a mode type corresponding to the terrain mode request signal, judging whether the temperature of a friction plate is greater than a preset temperature threshold value or not under the condition that the mode type is a four-wheel drive standard mode, and finally controlling a transfer case transmission mechanism to press the friction plate to enable the vehicle to enter a four-wheel drive state under the condition that the temperature is less than or equal to the preset temperature threshold value. The temperature of the friction plate is obtained before the friction plate is pressed, so that the four-wheel drive function of a vehicle is realized by pressing the friction plate under the condition of overhigh temperature, and the problem that the friction plate is ablated due to overheating of the friction plate is avoided.
Or under the condition that the temperature of the friction plate is greater than the preset temperature threshold value, controlling a mechanical locking mechanism in the transfer case assembly to enter a locking state, and enabling the vehicle to be in a four-wheel drive state. That is to say, under the condition that the friction disc temperature is too high, realize the four-wheel drive function of vehicle through mechanical locking mechanism, guaranteed the vehicle and be the four-wheel drive function when avoiding the friction disc to overheat to lead to the friction disc ablation. The preset temperature threshold is smaller than the overheat temperature of the friction plate, for example, the preset temperature threshold may be a temperature value obtained by subtracting 50 degrees celsius from the overheat temperature of the friction plate, which is not specifically limited in the present disclosure.
In a possible mode, after the transfer case transmission mechanism is controlled to open the friction plate, the heat dissipation time of the friction plate is counted to obtain the heat dissipation time, and under the condition that the heat dissipation time reaches a preset time threshold, if the vehicle speed of the vehicle is greater than the preset vehicle speed threshold, the transfer case transmission mechanism compresses the friction plate, and the mechanical locking mechanism is controlled to enter a release state.
Optionally, in the process of timing the heat dissipation duration of the friction plate, if a flameout signal of the vehicle is received, the timed first duration and the occurrence time of the flameout signal are stored, when the vehicle is ignited, the second duration is determined according to the ignition time and the occurrence time of the flameout signal, and finally the sum of the first duration and the second duration is used as the heat dissipation duration.
That is to say, after the transfer case transmission mechanism is controlled to open the friction plate, the heat dissipation time of the friction plate is counted, whether the vehicle speed of the vehicle meets the switching condition is judged according to the received vehicle speed signal, and under the condition that the heat dissipation time reaches the preset time threshold and the vehicle speed is greater than the preset vehicle speed threshold, the transfer case transmission mechanism compresses the friction plate and controls the mechanical locking mechanism to enter the release state. The preset time threshold may be set according to a time period from the time when the friction plate is opened to the time when the temperature of the friction plate is lower than the preset temperature threshold, for example, 25 seconds, and the vehicle speed may be between 40km/h and 60km/h, for example, 50km/h, which is not limited in this disclosure.
And under the condition that the vehicle is flamed out, the timing of the heat dissipation duration of the friction plate can be stopped, and the final heat dissipation duration can be obtained through the heat dissipation duration recorded before the occurrence moment of the flameout signal and the accumulated ignition moment.
By adopting the method, the vehicle is in a four-wheel drive state by acquiring the vehicle speed signal and recording the heat dissipation time of the friction plate, and switching back to a mode of pressing the friction plate when the heat dissipation time reaches the preset time threshold and the vehicle speed is greater than the preset vehicle speed threshold after the friction plate is opened for heat dissipation. The problems of gear abrasion and the like caused by long-time use of a mechanical lock in a four-wheel drive standard mode are avoided.
In a possible mode, a terrain mode request signal of the vehicle is obtained, a mode type corresponding to the terrain mode request signal is determined, and under the condition that the mode type is a four-wheel-drive mud land mode, a four-wheel-drive sand land mode, a four-wheel-drive low-speed mode or a four-wheel-drive rock mode, the mechanical locking mechanism is controlled to enter a locking state, so that the vehicle enters a four-wheel-drive state.
Generally speaking, under the working condition of strong off-road, for example, the slope is 30% -60% and the slope is in the condition of soil slope with crossed axes, deep sand is taken off the trouble, deep mud is taken off the trouble and the like, the user can meet the driving requirement by selecting the corresponding mode type. In such a case, the inadequate four-wheel drive performance of the vehicle results in poor vehicle throughput due to the limited torque capacity of the friction discs, and even the friction discs can ablate. Therefore, in the case where the mode type is the four-wheel-drive mud land mode, the four-wheel-drive sand land mode, the four-wheel-drive low-speed mode or the four-wheel-drive rock mode, the vehicle is brought into the four-wheel-drive state by controlling the mechanical locking mechanism to enter the locked state. Therefore, the advantages of the existing intelligentization of timely four-wheel drive, good fuel economy and the like are reserved, the strong off-road capability of the vehicle is improved, and the risk of ablation of the friction plate of the transfer case is effectively reduced.
It should be noted that, when the mode type is the four-wheel drive low-speed mode or the four-wheel drive rock mode, a mode switching signal is sent to the transmission of the vehicle, and after the transmission performs neutral locking according to the mode switching signal, the transmission mechanism of the transfer case is controlled to perform low-speed torque increase, and the mechanical locking mechanism is controlled to enter a locking state.
For example, after the transmission is locked in a neutral gear, the driving motor enables the transfer case to be in a low-speed mode through a shifting fork to carry out torque increasing operation, and then the mechanical locking mechanism is locked. In the mode, the four-wheel drive performance of the transfer case is in the strongest state, and the off-road capability of the vehicle is greatly improved. The speed ratio of the low-speed torque-up may be 2.64, which is not specifically limited by the present disclosure.
In addition, if the mode type is the four-wheel-drive mud land mode, the four-wheel-drive sand land mode, the four-wheel-drive low-speed mode or the four-wheel-drive rock mode, if the mechanical locking mechanism is controlled to be in the locking state, the mode type is changed into the four-wheel-drive standard mode, and the transfer case transmission mechanism is controlled to press the friction plate, so that the vehicle is in the four-wheel-drive state. That is, in the event of a failure of the mechanical locking mechanism, the vehicle can be brought into a four-wheel-drive state by pressing the friction plates, and in the event of overheating of the friction plates, heat can be dissipated by opening the friction plates. Or under the condition that the friction plate has a fault, the mechanical locking mechanism can be controlled to enter a locking state, so that the vehicle enters a four-wheel drive state, and the four-wheel drive function of the vehicle can be normally used.
Based on the same inventive concept, the disclosed embodiment further provides a vehicle, as shown in fig. 2, the vehicle 20 includes: the transfer case assembly 200 comprises a transfer case controller 201, a transfer case transmission mechanism 202 and a mechanical locking mechanism 203, wherein the transfer case controller 201 is connected with the mechanical locking mechanism 203, the transfer case transmission mechanism 202 is connected with a torque output end of a transmission of the vehicle, the mechanical locking mechanism 203 is used for locking the transfer case transmission mechanism 202 and a wheel driving mechanism of the vehicle, and the transfer case controller 201 is used for executing the vehicle control method.
By adopting the vehicle, under the condition that the friction plate in the transfer case assembly of the vehicle is in a pressing state, whether the temperature of the friction plate is larger than a preset temperature threshold value or not is judged, and under the condition that the temperature is larger than the preset temperature threshold value, the mechanical locking mechanism in the transfer case assembly is controlled to enter a locking state, so that the mechanical locking mechanism locks the transfer case transmission mechanism and a wheel driving mechanism of the vehicle, the vehicle is in a four-wheel driving state, the transfer case transmission mechanism in the transfer case assembly is controlled to open the friction plate, and the friction plate is prevented from being overheated. Through this vehicle, can avoid the vehicle to lose the four-wheel drive function when the friction disc is overheated, open the heat dissipation of friction disc, solve among the prior art and dispel the heat through opening the friction disc when the friction disc is overheated, lead to the vehicle to lose the technical problem of four-wheel drive function.
In a possible manner, the vehicle further comprises a body stabilization system connected to the transfer case controller and a meter connected to the body stabilization system. The transfer case controller is also configured to send a drive mode feedback signal to the body stability system in response to the terrain mode request signal. The vehicle body stabilizing system is used for judging whether the mode type of a driving mode feedback signal is matched with the mode type of a terrain mode request signal or not under the condition that the driving mode feedback signal is received, and controlling the instrument to display terrain mode reminding information corresponding to the mode type of the terrain mode request signal under the condition that the mode type of the driving mode feedback signal is matched with the mode type of the terrain mode request signal, or controlling the instrument to display information for reminding that the mode type requested by the terrain mode request signal is not entered under the condition that the mode type of the driving mode feedback signal is not matched with the mode type of the terrain mode request signal.
Alternatively, the mode type of the driving mode feedback signal matched with the four-wheel-drive mud ground mode request signal and the four-wheel-drive sand ground mode request signal is a 4WD Lock mode, the mode type of the driving mode feedback signal matched with the four-wheel-drive low-speed mode request signal or the four-wheel-drive rock mode request signal is a 4L mode, and the mode type of the driving mode feedback signal matched with the four-wheel-drive standard mode request signal is an AWD mode.
Specifically, the 4WD Lock mode represents a high-speed four-wheel drive mode using a mechanical locking mechanism for locking, the 4L mode represents a low-speed four-wheel drive mode using a mechanical locking mechanism for locking, and the AWD mode represents a high-speed four-wheel drive mode using a friction plate. The matching relationship between the mode type of the terrain mode request signal and the mode type of the driving mode feedback signal is shown in the following table 1, a reserved mode request signal and a reserved feedback signal are reserved, and the following newly-added working condition modes can be compatible.
TABLE 1
Figure BDA0003209117090000111
Illustratively, the vehicle body stabilizing system sends a four-wheel drive mud land mode request signal to the transfer case controller, the mode type of a drive mode feedback signal fed back to the vehicle body stabilizing system by the transfer case controller is a 4WD Lock mode, the mode type of the drive mode feedback signal is judged to be matched with the mode type of a terrain mode request signal, then the vehicle body stabilizing system sends the four-wheel drive mud land mode request signal to the instrument, and the instrument displays text prompt information of 'entering mud land mode' after receiving the terrain mode request signal. Or the type of the driving mode feedback signal fed back to the vehicle body stabilizing system by the transfer case controller is not the 4WD Lock mode, the mode type of the driving mode feedback signal is judged not to be matched with the mode type of the terrain mode request signal, then the vehicle body stabilizing system sends a four-wheel drive standard mode request signal to the instrument, and the instrument displays the text prompt information of 'entering the standard mode' after receiving the terrain mode request signal. In addition, the other mode request signals may refer to the four-wheel mud-driving mode request signal, which is not described herein again.
In addition, a transfer case controller is connected to the meter, the transfer case controller being further configured to send a drive mode feedback signal to the meter for responding to the terrain mode request signal. The instrument is used for determining the mode type of a driving mode feedback signal under the condition that the driving mode feedback signal is received, judging whether the current vehicle speed of a vehicle is greater than a vehicle speed calibration value corresponding to the mode type or not under the condition that the mode type of the driving mode feedback signal is a four-wheel drive mud land mode, a four-wheel drive sand land mode, a four-wheel drive low-speed mode or a four-wheel drive rock mode, and displaying preset vehicle speed alarm information under the condition that the current vehicle speed is greater than the vehicle speed calibration value.
It should be noted that, under the condition that the mode type is not changed, the transfer case controller continuously sends a driving mode feedback signal for responding to the terrain mode request signal to the instrument, and if the missing signal frame of the driving mode feedback signal received by the instrument is greater than the preset frame number threshold, the displayed vehicle speed alarm information is cancelled. Or canceling the displayed vehicle speed alarm information under the condition that the acquired current vehicle speed of the vehicle is less than the vehicle speed calibration value. By timely reminding the driver of overspeed, the safety problem caused by the fact that the vehicle is driven at the four-wheel drive state at an over-high speed is avoided.
For example, in the case that the transfer case controller sends a driving mode feedback signal of the type "4 WD Lock mode" to the meter, the current vehicle speed of the vehicle is acquired, and if the current vehicle speed is greater than a preset vehicle speed calibration value, the meter displays vehicle speed alarm information of "4H mode please slow down". When the vehicle speed is less than the preset vehicle speed calibration value, the instrument immediately cancels the display of the vehicle speed alarm information. The vehicle speed calibration value may be 80km/h, which is not specifically limited by this disclosure. In addition, the meter cancels the display of the vehicle speed alarm information when the lost signal frame of the received drive mode feedback signal is greater than the preset frame number threshold and/or when the acquired current vehicle speed of the vehicle is less than the vehicle speed calibration value, and the frame number threshold may be 10 frames, which is not specifically limited by the disclosure. In addition, the driving mode feedback signal of the type "4L mode" has the same control method as the 4WD Lock mode except that the preset vehicle speed calibration value is smaller than the preset vehicle speed calibration value of the 4WD Lock mode and the displayed vehicle speed alarm information is different, and the details of the disclosure are not repeated herein. The preset vehicle speed calibration value of the 4L mode may be 40km/h, and the displayed vehicle speed alarm information may be "slow speed reduction and slow running in the 4L mode", which is not specifically limited in this disclosure.
FIG. 3 is a schematic diagram illustrating a vehicle signaling according to an exemplary embodiment. As shown in fig. 3, a driver's operation on a terrain mode switch to select a terrain mode switch triggers a terrain mode switch signal to pass through a vehicle body controller via a LIN line, the vehicle body controller sends a terrain mode signal corresponding to the terrain mode switch signal to a vehicle body stabilization system via a CAN bus, the vehicle body stabilization system sends a terrain mode request signal corresponding to the terrain mode signal to a transfer case controller, the transfer case controller controls a mechanical locking mechanism to enter a release state or a locking state according to the terrain mode request signal or presses a friction plate, and sends a driving mode feedback signal for responding to the terrain mode request signal to the vehicle body stabilization system and a meter, and the vehicle body stabilization system needs to send a corresponding terrain mode request signal to the meter after receiving the driving mode feedback signal.
In order to make the method provided by the embodiment of the present disclosure easier to understand by those skilled in the art, the steps of the vehicle control method provided by the embodiment of the present disclosure will be described in detail below by taking the four-wheel drive rock mode request signal as an example. As shown in fig. 4, the method includes:
s401, the vehicle body stabilizing system sends a four-wheel drive rock mode request signal to the transfer case controller.
And S402, after receiving the four-wheel drive rock mode request signal, the transfer case controller sends a mode switching signal to the transmission.
And S403, neutral locking is performed on the transmission.
And S404, controlling the transfer case transmission mechanism to perform low-speed torque increase by the transfer case controller, and controlling the mechanical locking mechanism to enter a locking state.
And S405, the transfer case controller sends a driving mode feedback signal with the type of 4L mode to the vehicle body stabilizing system.
And S406, the transfer case controller sends a driving mode feedback signal with the type of 4L mode to the instrument.
S407, the vehicle body stabilizing system sends a four-wheel drive rock mode request signal to the instrument, and the instrument displays a character prompt message of 'entering a rock mode'.
And S408, acquiring the current speed of the vehicle by the instrument, and judging whether the current speed is greater than a preset speed calibration value.
Further, in case that the current vehicle speed is greater than the preset vehicle speed calibration value, step S409 is executed, otherwise step S410 is executed.
And S409, displaying vehicle speed alarm information of 'please slow down in 4L mode' by the instrument.
S410, the instrument does not display the vehicle speed alarm information of 'please slow down in 4L mode'.
S411, the instrument judges whether the lost signal frame of the received drive mode feedback signal is larger than a preset frame number threshold value.
Further, in case that the missing signal frame of the driving mode feedback signal is greater than the preset frame number threshold, step S410 is performed, otherwise, step S409 is performed.
By adopting the method, under the condition that the mode type of the terrain mode request signal sent to the transfer case controller by the vehicle body stabilizing system is the four-wheel drive rock mode, the transfer case controller firstly sends a mode switching signal to the transmission, and after the transmission is locked in a neutral gear, the transmission mechanism of the transfer case is controlled to carry out low-speed torque increase, and the mechanical locking mechanism is controlled to enter a locking state. At the moment, the four-wheel drive performance of the vehicle is in the strongest state, and the off-road capability of the vehicle is greatly improved. In addition, the transfer case controller sends a driving mode feedback signal to the instrument and the vehicle body stabilizer to remind a driver of the driving mode of the vehicle and the vehicle speed alarm under the condition of overspeed, so that the risk of traffic accidents of the vehicle is reduced.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. A vehicle control method, characterized by comprising:
under the condition that a friction plate in a transfer case assembly of the vehicle is in a pressing state, judging whether the temperature of the friction plate is greater than a preset temperature threshold value or not;
and under the condition that the temperature is greater than a preset temperature threshold value, controlling a mechanical locking mechanism in the transfer case assembly to enter a locking state, and controlling a transfer case transmission mechanism in the transfer case assembly to open the friction plate, wherein in the locking state, the mechanical locking mechanism locks the transfer case transmission mechanism and a wheel driving mechanism of the vehicle, so that the vehicle is in a four-wheel drive state.
2. The method of claim 1, wherein the determining whether the temperature of a friction plate in a transfer case assembly of the vehicle is greater than a preset temperature threshold before in the case that the friction plate is in a pressed state comprises:
acquiring a terrain mode request signal of the vehicle;
determining a mode type corresponding to the terrain mode request signal;
under the condition that the mode type is a four-wheel drive standard mode, judging whether the temperature of the friction plate is greater than a preset temperature threshold value or not;
and under the condition that the temperature is less than or equal to a preset temperature threshold value, controlling the transfer case transmission mechanism to press a friction plate, so that the vehicle enters a four-wheel drive state.
3. The method of claim 1, further comprising:
timing the heat dissipation time of the friction plate after controlling the transfer case transmission mechanism to open the friction plate to obtain the heat dissipation time;
and under the condition that the heat dissipation time length reaches a preset time length threshold value, if the vehicle speed of the vehicle is greater than a preset vehicle speed threshold value, controlling the transfer case transmission mechanism to press the friction plate, and controlling the mechanical locking mechanism to enter a release state.
4. The method of claim 3, wherein timing the heat dissipation period of the friction plate comprises:
in the process of timing the heat dissipation duration of the friction plate, if a flameout signal of the vehicle is received, storing the timed first duration and the occurrence time of the flameout signal; and the number of the first and second electrodes,
when the vehicle is ignited, determining a second time length according to the ignition time and the occurrence time of the flameout signal;
and taking the sum of the first duration and the second duration as the heat dissipation duration.
5. The method of claim 2, further comprising:
and under the condition that the mode type is a four-wheel-drive mud land mode, a four-wheel-drive sand land mode, a four-wheel-drive low-speed mode or a four-wheel-drive rock mode, controlling the mechanical locking mechanism to enter a locking state, so that the vehicle enters a four-wheel-drive state.
6. The method of claim 5, wherein the controlling the mechanical locking mechanism into a locked state if the mode type is a four-wheel-drive mud mode, a four-wheel-drive sand mode, a four-wheel-drive low-speed mode, or a four-wheel-drive rock mode comprises:
transmitting a mode switching signal to a transmission of the vehicle in case the mode type is a four-wheel drive low speed mode or a four-wheel drive rock mode;
and after the transmission locks the neutral gear according to the mode switching signal, controlling the transmission mechanism of the transfer case to increase the torque at a low speed, and controlling the mechanical locking mechanism to enter the locking state.
7. The method according to any one of claims 5 or 6, further comprising:
and if the mode type is a four-wheel-drive mud land mode, a four-wheel-drive sand land mode, a four-wheel-drive low-speed mode or a four-wheel-drive rock mode, if the mechanical locking mechanism fails to be controlled to enter the locking state, changing the mode type into a four-wheel-drive standard mode, and controlling the transfer case transmission mechanism to press the friction plate, so that the vehicle enters a four-wheel-drive state.
8. A vehicle, characterized in that the vehicle comprises:
the transfer case assembly comprises a transfer case controller, a transfer case transmission mechanism and a mechanical locking mechanism, wherein the transfer case controller is connected with the mechanical locking mechanism, the transfer case transmission mechanism is connected with a torque output end of a transmission of the vehicle, and the mechanical locking mechanism is used for locking the transfer case transmission mechanism and a wheel driving mechanism of the vehicle;
the transfer case controller is configured to perform the method of any of claims 1-7.
9. The vehicle of claim 8, further comprising a body stabilization system coupled to the transfer case controller and a meter coupled to the body stabilization system;
the transfer case controller is further configured to send a drive mode feedback signal to the body stability system in response to the terrain mode request signal;
the body stabilization system is configured to:
under the condition that the driving mode feedback signal is received, judging whether the mode type of the driving mode feedback signal is matched with the mode type of the terrain mode request signal;
under the condition that the mode type of the driving mode feedback signal is matched with the mode type of the terrain mode request signal, controlling the instrument to display terrain mode reminding information corresponding to the mode type of the terrain mode request signal;
and under the condition that the mode type of the driving mode feedback signal is not matched with the mode type of the terrain mode request signal, controlling the meter to display information for prompting that the mode type requested by the terrain mode request signal is not entered.
10. The vehicle of claim 9, wherein the transfer case controller is coupled to the meter, the transfer case controller further configured to send a drive mode feedback signal to the meter in response to the terrain mode request signal;
the meter is configured to:
determining a mode type of the driving mode feedback signal in case of receiving the driving mode feedback signal;
under the condition that the mode type of the driving mode feedback signal is a four-wheel-drive mud land mode, a four-wheel-drive sand land mode, a four-wheel-drive low-speed mode or a four-wheel-drive rock mode, judging whether the current vehicle speed of the vehicle is greater than a vehicle speed calibration value corresponding to the mode type;
and displaying preset vehicle speed alarm information under the condition that the current vehicle speed is greater than the vehicle speed calibration value.
CN202110925451.6A 2021-08-12 2021-08-12 Vehicle control method and vehicle Pending CN114714902A (en)

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JPS61178232A (en) * 1985-01-31 1986-08-09 Nissan Motor Co Ltd Driving force transmission for four-wheel drive vehicle
US7630812B2 (en) * 2004-02-09 2009-12-08 Ford Global Technologies, Llc Method and system for controlling a transfer case clutch to protect against excessive heat
JP6589579B2 (en) * 2015-11-11 2019-10-16 株式会社ジェイテクト Driving force transmission control device
CN110645288B (en) * 2019-09-05 2021-02-05 南通大学 Transfer case torque control method for eliminating temperature influence
CN112855871B (en) * 2021-01-19 2022-02-11 燕山大学 Two-gear transfer case with electric control power distribution and mechanical locking

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