Vehicle control method and vehicle

Abstract

The present disclosure relates to a vehicle control method and vehicle to address the technical problem in related art whereby the vehicle loses its four-wheel drive function by opening the friction plates to dissipate heat when the friction plates overheat. The method comprises: determining whether the temperature of the friction plates in the vehicle's transfer case assembly is greater than a preset temperature threshold when the friction plates are in a compressed state; if the temperature is greater than the preset temperature threshold, controlling a mechanical locking mechanism in the transfer case assembly to enter a locked state and controlling a transfer case transmission mechanism in the transfer case assembly to open the friction plates. In the locked state, the mechanical locking mechanism locks the transfer case transmission mechanism and the vehicle's wheel drive mechanism, thereby enabling the vehicle to enter a four-wheel drive state.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle technology, and in particular, to a vehicle control method and a vehicle. Background Art

[0002] The timely four-wheel drive will only be converted to four-wheel drive when appropriate, and it will still be a two-wheel drive drive system under other circumstances. In actual driving, some road conditions require four-wheel drive, such as driving on slippery ice and snow roads and uneven roads, or when the wheels are stuck in mud pits and slipping, or climbing hills. The vehicle requires a larger driving force, and both the front and rear wheels need power drive to improve the vehicle's passing performance. The transfer case is an important transmission component in four-wheel drive vehicles. It realizes the four-wheel drive function of the vehicle by outputting the transmission input torque to the front and rear axles. Specifically, the transfer case realizes the four-wheel drive function by compressing the internal friction plate, but due to the limitation of the torque capacity of the friction plate, the vehicle has the problem of friction plate overheating when driving in four-wheel drive on unpaved roads.

[0003] In the prior art, when the friction plate overheats, the compressed friction plate is opened to dissipate heat to prevent friction plate abrasion caused by overheating. However, opening the friction plate can cause the vehicle to lose its four-wheel drive function, thereby reducing the vehicle's off-road capability and even posing a safety hazard. Summary of the Invention

[0004] The purpose of the present disclosure is to provide a vehicle control method and a vehicle to solve the technical problem in the related art that when the friction plate is overheated, the friction plate is opened for heat dissipation, resulting in the vehicle losing the four-wheel drive function.

[0005] In order to achieve the above objectives, a first aspect of the present disclosure provides a vehicle control method, the method comprising:

[0006] When a friction plate in a transfer case assembly of the vehicle is in a compressed state, determining whether a temperature of the friction plate is greater than a preset temperature threshold;

[0007] When the temperature is greater than a preset temperature threshold, the mechanical locking mechanism in the transfer case assembly is controlled to enter a locked state, and the transfer case transmission mechanism in the transfer case assembly is controlled to open the friction plate, wherein, in the locked state, the mechanical locking mechanism locks the transfer case transmission mechanism and the wheel drive mechanism of the vehicle, so that the vehicle is in a four-wheel drive state.

[0008] Optionally, when the friction plate in the transfer case assembly of the vehicle is in a compressed state, determining whether the temperature of the friction plate is greater than a preset temperature threshold comprises:

[0009] obtaining a terrain mode request signal of the vehicle;

[0010] determining a mode type corresponding to the terrain mode request signal;

[0011] When the mode type is the four-wheel drive standard mode, determining whether the temperature of the friction plate is greater than a preset temperature threshold;

[0012] When the temperature is less than or equal to a preset temperature threshold, the transfer case transmission mechanism is controlled to compress the friction plate, so that the vehicle enters a four-wheel drive state.

[0013] Optionally, the method further includes:

[0014] After controlling the transfer case transmission mechanism to open the friction plate, timing the heat dissipation time of the friction plate to obtain the heat dissipation time;

[0015] When the heat dissipation time reaches a preset time threshold, if the vehicle speed is greater than a preset speed threshold, the transfer case transmission mechanism is controlled to press the friction plate, and the mechanical locking mechanism is controlled to enter a released state.

[0016] Optionally, timing the heat dissipation time of the friction plate includes:

[0017] During the process of timing the heat dissipation time of the friction plate, if a flameout signal of the vehicle is received, the first time duration and the time when the flameout signal occurs are saved; and

[0018] When the vehicle is ignited, determining a second duration according to the ignition timing and the timing of the ignition-off signal;

[0019] The sum of the first duration and the second duration is used as the heat dissipation duration.

[0020] Optionally, the method further includes:

[0021] When the mode type is the four-wheel drive mud mode, the four-wheel drive sand mode, the four-wheel drive low-speed mode or the four-wheel drive rock mode, the mechanical locking mechanism is controlled to enter a locking state, so that the vehicle enters the four-wheel drive state.

[0022] Optionally, when the mode type is the four-wheel drive mud mode, the four-wheel drive sand mode, the four-wheel drive low-speed mode, or the four-wheel drive rock mode, controlling the mechanical locking mechanism to enter the locked state includes:

[0023] sending a mode switching signal to a transmission of the vehicle when the mode type is a four-wheel drive low speed mode or a four-wheel drive rock mode;

[0024] After the transmission is locked in neutral according to the mode switching signal, the transfer case transmission mechanism is controlled to increase torque at low speed, and the mechanical locking mechanism is controlled to enter the locked state.

[0025] Optionally, the method further includes:

[0026] When the mode type is four-wheel drive mud mode, four-wheel drive sand mode, four-wheel drive low-speed mode or four-wheel drive rock mode, if controlling the mechanical locking mechanism to enter the locking state fails, the mode type is changed to four-wheel drive standard mode, and the transfer case transmission mechanism is controlled to press the friction plate, so that the vehicle enters the four-wheel drive state.

[0027] A second aspect of the present disclosure further provides a vehicle, comprising:

[0028] a transfer case assembly, the transfer case assembly comprising a transfer case controller, a transfer case transmission mechanism, and a mechanical locking mechanism, the transfer case controller being connected to the mechanical locking mechanism, the transfer case transmission mechanism being connected to a torque output end of a transmission of the vehicle, the mechanical locking mechanism being used to lock the transfer case transmission mechanism and a wheel drive mechanism of the vehicle;

[0029] The transfer case controller is used to execute the method described in any one of the first aspects above.

[0030] Optionally, the vehicle further comprises a vehicle body stabilization system connected to the transfer case controller and an instrument connected to the vehicle body stabilization system;

[0031] The transfer case controller is further configured to send a driving mode feedback signal to the vehicle body stability system in response to the terrain mode request signal;

[0032] The vehicle body stabilization system is used to:

[0033] upon receiving the driving mode feedback signal, determining whether a mode type of the driving mode feedback signal matches a mode type of the terrain mode request signal;

[0034] When the mode type of the driving mode feedback signal matches the mode type of the terrain mode request signal, controlling the instrument to display terrain mode reminder information corresponding to the mode type of the terrain mode request signal;

[0035] When the mode type of the driving mode feedback signal does not match the mode type of the terrain mode request signal, the instrument is controlled to display information indicating that the mode type requested by the terrain mode request signal has not been entered.

[0036] Optionally, the transfer case controller is connected to the meter, and the transfer case controller is further configured to send a driving mode feedback signal to the meter in response to the terrain mode request signal;

[0037] The instrument is used to:

[0038] determining a mode type of the driving mode feedback signal upon receiving the driving mode feedback signal;

[0039] When the driving mode feedback signal indicates a mode type of four-wheel drive mud mode, four-wheel drive sand mode, four-wheel drive low speed mode, or four-wheel drive rock mode, determining whether the current vehicle speed is greater than a speed calibration value corresponding to the mode type;

[0040] When the current vehicle speed is greater than the calibrated vehicle speed value, a preset vehicle speed warning message is displayed.

[0041] Through the above technical solution, at least the following technical effects can be achieved:

[0042] When the friction plate in the transfer case assembly of the vehicle is in a compressed state, it is determined whether the temperature of the friction plate is greater than a preset temperature threshold. If the temperature is greater than the preset temperature threshold, the mechanical locking mechanism in the transfer case assembly is controlled to enter a locked state, and the transfer case transmission mechanism in the transfer case assembly is controlled to open the friction plate. In the locked state, the mechanical locking mechanism locks the transfer case transmission mechanism and the vehicle's wheel drive mechanism, so that the vehicle is in a four-wheel drive state. This method can open the friction plate to dissipate heat when the friction plate overheats, and simultaneously control the mechanical locking mechanism in the transfer case assembly to enter a locked state, so that the vehicle is in a four-wheel drive state. This solves the technical problem in related arts where the vehicle loses its four-wheel drive function by opening the friction plate to dissipate heat when the friction plate overheats.

[0043] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0045] Figure 1 is a flow chart of a vehicle control method provided by an embodiment of the present disclosure;

[0046] Figure 2 is a block diagram of a vehicle provided by an embodiment of the present disclosure;

[0047] Figure 3is a schematic diagram of vehicle signal transmission provided by an embodiment of the present disclosure;

[0048] Figure 4 It is a flowchart of another vehicle control method provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0049] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0050] It should be understood that the various steps described in the method embodiments of the present disclosure can be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present disclosure is not limited in this respect. The term "including" and its variations used herein are open inclusions, i.e., "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the description below. It should be noted that the concepts of "first", "second", etc. mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units. In addition, the modifications of "one" and "a plurality of" mentioned in the present disclosure are illustrative and not restrictive. Those skilled in the art should understand that unless otherwise clearly indicated in the context, they should be understood as "one or more".

[0051] In the prior art, when the friction plate overheats, the compressed friction plate is opened to dissipate heat to prevent friction plate abrasion caused by overheating. However, opening the friction plate can cause the vehicle to lose its four-wheel drive function, thereby reducing the vehicle's off-road capability and even posing a safety hazard.

[0052] In view of this, the present disclosure provides a vehicle control method and a vehicle to solve the technical problem in the related art that when the friction plate is overheated, the friction plate is opened for heat dissipation, resulting in the vehicle losing the four-wheel drive function.

[0053] The technical solution of the present disclosure is described in detail below with reference to embodiments.

[0054] The present disclosure provides a vehicle control method, such as Figure 1 As shown, the method includes:

[0055] S101 : When a friction plate in a transfer case assembly of the vehicle is in a compressed state, determine whether a temperature of the friction plate is greater than a preset temperature threshold.

[0056] S102 . When the temperature is greater than a preset temperature threshold, control the mechanical locking mechanism in the transfer case assembly to enter a locked state, and control the transfer case transmission mechanism in the transfer case assembly to open the friction plate.

[0057] Wherein, in the locked state, the mechanical locking mechanism locks the transfer case transmission mechanism and the wheel drive mechanism of the vehicle, so that the vehicle is in a four-wheel drive state.

[0058] Using the above method, when the friction plates in the vehicle's transfer case assembly are in a compressed state, it is determined whether the temperature of the friction plates is greater than a preset temperature threshold. If the temperature is greater than the preset temperature threshold, the mechanical locking mechanism in the transfer case assembly is controlled to enter a locked state, thereby causing the mechanical locking mechanism to lock the transfer case transmission mechanism and the vehicle's wheel drive mechanism, placing the vehicle in a four-wheel drive state. The transfer case transmission mechanism in the transfer case assembly is controlled to open the friction plates to prevent the friction plates from overheating. This method can open the friction plates to dissipate heat when the friction plates overheat, while preventing the vehicle from losing its four-wheel drive function. This solves the technical problem in related technologies where the vehicle loses its four-wheel drive function by opening the friction plates to dissipate heat when the friction plates overheat.

[0059] In order to enable those skilled in the art to better understand the vehicle control method provided by the present disclosure, the above steps are described in detail with examples below.

[0060] It should be noted that the vehicle terrain mode request signal provided in the embodiments of the present disclosure includes, but is not limited to, the following four-wheel drive modes: four-wheel drive standard mode, four-wheel drive mud mode, four-wheel drive sand mode, four-wheel drive low-speed mode, and four-wheel drive rock mode. In related art, in four-wheel drive standard mode, the vehicle enters the four-wheel drive state by controlling the transfer case transmission mechanism to compress the friction plates.

[0061] Therefore, in a possible embodiment, when the friction plates in the vehicle's transfer case assembly are in a compressed state, determining whether the temperature of the friction plates is greater than a preset temperature threshold involves: first obtaining a terrain mode request signal from the vehicle, determining the mode type corresponding to the terrain mode request signal, and, if the mode type is a four-wheel drive standard mode, determining whether the temperature of the friction plates is greater than a preset temperature threshold; and finally, if the temperature is less than or equal to the preset temperature threshold, controlling the transfer case transmission mechanism to compress the friction plates, thereby enabling the vehicle to enter a four-wheel drive state. Obtaining the temperature of the friction plates before compressing the friction plates avoids compressing the friction plates to implement the vehicle's four-wheel drive function when the temperature is too high, thereby preventing the problem of friction plate burnout due to overheating of the friction plates.

[0062] Alternatively, if the friction plate temperature exceeds a preset temperature threshold, the mechanical locking mechanism in the transfer case assembly is controlled to enter a locked state, placing the vehicle in four-wheel drive. In other words, if the friction plate temperature is too high, the mechanical locking mechanism enables the vehicle's four-wheel drive function, preventing friction plate overheating and resulting in friction plate burnout while maintaining the vehicle's four-wheel drive function. The preset temperature threshold is lower than the friction plate overheat temperature. For example, the preset temperature threshold can be the friction plate overheat temperature minus 50 degrees Celsius, a value not specifically limited in this disclosure.

[0063] In a possible manner, after controlling the transfer case transmission mechanism to open the friction plate, the heat dissipation time of the friction plate is timed to obtain the heat dissipation time, and when the heat dissipation time reaches a preset time threshold, if the vehicle speed is greater than the preset speed threshold, the transfer case transmission mechanism presses the friction plate and controls the mechanical locking mechanism to enter the release state.

[0064] Optionally, during the process of timing the heat dissipation time of the friction plate, if a vehicle shutdown signal is received, the first time duration and the time when the shutdown signal occurs are saved, and when the vehicle is ignited, the second time duration is determined based on the ignition time and the time when the shutdown signal occurs, and finally the sum of the first time duration and the second time duration is used as the heat dissipation time duration.

[0065] That is, after the transfer case transmission mechanism is controlled to open the friction plates, the heat dissipation time of the friction plates is timed, and based on the received vehicle speed signal, a determination is made as to whether the vehicle speed meets the switching conditions. If both the heat dissipation time reaches a preset time threshold and the vehicle speed exceeds a preset speed threshold, the transfer case transmission mechanism compresses the friction plates and controls the mechanical locking mechanism to enter a released state. The preset time threshold can be set based on the time it takes for the friction plates to open until their temperature drops below a preset temperature threshold, for example, 25 seconds, and the vehicle speed can be between 40 km / h and 60 km / h, for example, 50 km / h. This disclosure does not specifically limit this.

[0066] Moreover, when the vehicle is turned off, the heat dissipation time of the friction plate will stop counting. At this time, the final heat dissipation time can be obtained by accumulating the previously recorded heat dissipation time by the time when the flameout signal occurs and the ignition time.

[0067] By acquiring the vehicle speed signal and recording the cooling time of the friction pads, the above method can switch back to tightening the friction pads to put the vehicle in four-wheel drive mode after the friction pads are opened for cooling, provided that the cooling time reaches a preset threshold and the vehicle speed exceeds a preset threshold. This avoids problems such as gear wear caused by prolonged use of the mechanical lock in standard four-wheel drive mode.

[0068] In a possible manner, a terrain mode request signal of the vehicle is obtained, and a mode type corresponding to the terrain mode request signal is determined. When the mode type is four-wheel drive mud mode, four-wheel drive sand mode, four-wheel drive low-speed mode or 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.

[0069] Generally speaking, users choose the appropriate mode to meet their driving needs in demanding off-road conditions, such as 30%-60% slopes with crossed axles, deep sand escapes, and deep mud escapes. In these situations, due to the limitations of the friction plate torque capacity, the vehicle's four-wheel drive performance is insufficient, resulting in poor vehicle passability and even friction plate burnout. Therefore, when the mode type is four-wheel drive mud mode, four-wheel drive sand mode, four-wheel drive low-speed mode, or four-wheel drive rock mode, the vehicle enters four-wheel drive mode by controlling the mechanical locking mechanism to enter a locked state. This retains the original advantages of timely four-wheel drive, such as intelligence and good fuel economy, while enhancing the vehicle's strong off-road capabilities and effectively reducing the risk of transfer case friction plate burnout.

[0070] It is worth noting that when the mode type is four-wheel drive low-speed mode or four-wheel drive rock mode, a mode switching signal is sent to the vehicle's transmission. After the transmission is locked in neutral according to the mode switching signal, the transfer case transmission mechanism is controlled to increase torque at low speed, and the mechanical locking mechanism is controlled to enter a locked state.

[0071] For example, after the transmission is locked in neutral, the drive motor uses the shift fork to shift the transfer case into low-speed mode for torque boosting, which then causes the mechanical locking mechanism to engage. In this mode, the transfer case's four-wheel drive performance is at its peak, significantly enhancing the vehicle's off-road capabilities. The speed ratio for low-speed torque boosting can be 2.64, which is not specifically limited in this disclosure.

[0072] Furthermore, if the mechanical locking mechanism fails to lock when in 4WD Mud Mode, 4WD Sand Mode, 4WD Low Speed ​​Mode, or 4WD Rock Mode, the mode is changed to 4WD Standard Mode and the transfer case transmission mechanism is controlled to compress the friction plates, putting the vehicle into 4WD mode. This means that if the mechanical locking mechanism fails, the vehicle can enter 4WD mode by compressing the friction plates. Furthermore, if the friction plates overheat, they can be opened to dissipate heat. Alternatively, if the friction plates fail, the mechanical locking mechanism can be controlled to lock, putting the vehicle into 4WD mode, ensuring the vehicle's 4WD function remains operational.

[0073] Based on the same inventive concept, the embodiment of the present disclosure further provides a vehicle, such as Figure 2As shown, the vehicle 20 includes: a transfer case assembly 200, the transfer case assembly 200 includes a transfer case controller 201, a transfer case transmission mechanism 202, and a mechanical locking mechanism 203, the transfer case controller 201 is connected to the mechanical locking mechanism 203, the transfer case transmission mechanism 202 is connected to the torque output end of the vehicle's transmission, the mechanical locking mechanism 203 is used to lock the transfer case transmission mechanism 202 and the vehicle's wheel drive mechanism, and the transfer case controller 201 is used to execute the above-mentioned vehicle control method.

[0074] With the above-described vehicle, when the friction plates in the vehicle's transfer case assembly are in a compressed state, a determination is made as to whether the temperature of the friction plates is greater than a preset temperature threshold. If the temperature is greater than the preset temperature threshold, the mechanical locking mechanism in the transfer case assembly is controlled to enter a locked state, thereby causing the mechanical locking mechanism to lock the transfer case transmission mechanism and the vehicle's wheel drive mechanism, placing the vehicle in a four-wheel drive state. The transfer case transmission mechanism in the transfer case assembly is controlled to open the friction plates to prevent them from overheating. This vehicle can open the friction plates to dissipate heat when the friction plates overheat, while preventing the vehicle from losing its four-wheel drive function. This resolves the technical problem in related technologies where dissipating heat by opening the friction plates when the friction plates overheat causes the vehicle to lose its four-wheel drive function.

[0075] In a possible embodiment, the vehicle further includes a vehicle stability system connected to the transfer case controller and an instrument panel connected to the vehicle stability system. The transfer case controller is further configured to send a drive mode feedback signal to the vehicle stability system in response to a terrain mode request signal. Upon receiving the drive mode feedback signal, the vehicle stability system is configured to determine whether a mode type of the drive mode feedback signal matches a mode type of the terrain mode request signal. If the mode type of the drive mode feedback signal matches the mode type of the terrain mode request signal, the instrument panel is configured to display a terrain mode reminder message corresponding to the mode type of the terrain mode request signal. If the mode type of the drive mode feedback signal does not match the mode type of the terrain mode request signal, the instrument panel is configured to display a message indicating that the vehicle has not entered the mode type requested by the terrain mode request signal.

[0076] Optionally, the mode type of the driving mode feedback signal that matches the four-wheel drive mud mode request signal and the four-wheel drive sand mode request signal is 4WD Lock mode, the mode type of the driving mode feedback signal that matches the four-wheel drive low speed mode request signal or the four-wheel drive rock mode request signal is 4L mode, and the mode type of the driving mode feedback signal that matches the four-wheel drive standard mode request signal is AWD mode.

[0077] Specifically, 4WD Lock mode indicates a high-speed four-wheel drive mode locked using a mechanical locking mechanism, 4L mode indicates a low-speed four-wheel drive mode locked using a mechanical locking mechanism, and AWD mode indicates a high-speed four-wheel drive mode using friction plates. The matching relationship between the mode type of the terrain mode request signal and the mode type of the drive mode feedback signal is shown in Table 1 below. Reserved mode request signals and reserved feedback signals are also reserved to accommodate newly added operating modes.

[0078] Table 1

[0079]

[0080] For example, the vehicle stability system sends a 4WD mud mode request signal to the transfer case controller. If the transfer case controller sends a drive mode feedback signal indicating a 4WD Lock mode, the system determines that the drive mode feedback signal matches the terrain mode request signal. The system then sends a 4WD mud mode request signal to the instrument panel. Upon receiving the terrain mode request signal, the instrument panel displays a text prompt indicating "Entering Mud Mode." Alternatively, if the transfer case controller sends a drive mode feedback signal indicating a 4WD Lock mode, the system determines that the drive mode feedback signal does not match the terrain mode request signal. The system then sends a 4WD standard mode request signal to the instrument panel. Upon receiving the terrain mode request signal, the instrument panel displays a text prompt indicating "Entering Standard Mode." For other mode request signals, reference may be made to the 4WD mud mode request signal, which will not be discussed further herein.

[0081] In addition, the transfer case controller is connected to the instrument panel and is further configured to send a drive mode feedback signal to the instrument panel in response to the terrain mode request signal. Upon receiving the drive mode feedback signal, the instrument panel is configured to determine the mode type of the drive mode feedback signal and, if the drive mode feedback signal indicates a four-wheel drive mud mode, four-wheel drive sand mode, four-wheel drive low speed mode, or four-wheel drive rock mode, determine whether the vehicle's current speed exceeds a calibrated speed value corresponding to the mode type. If the current vehicle speed exceeds the calibrated speed value, the instrument panel is configured to display a preset speed warning message.

[0082] It should be noted that, while the transfer case mode remains unchanged, the controller continuously sends a drive mode feedback signal to the instrument cluster in response to the terrain mode request signal. If the number of missing frames of the received drive mode feedback signal exceeds a preset frame threshold, the displayed speed warning message is canceled. Alternatively, if the current vehicle speed is less than the calibrated speed, the displayed speed warning message is canceled. This timely speeding warning helps prevent safety issues caused by excessive speed in four-wheel drive mode.

[0083] For example, when the transfer case controller sends a drive mode feedback signal of type "4WD Lock Mode" to the instrument cluster, the current vehicle speed is obtained. If the current speed exceeds a preset speed calibration value, the instrument cluster displays a speed warning message stating "4H Mode, Please Slow Down." When the vehicle speed falls below the preset speed calibration value, the instrument cluster immediately cancels the speed warning message. The speed calibration value may be 80 km / h, which is not specifically limited in this disclosure. Furthermore, if the number of lost signal frames in the received drive mode feedback signal exceeds a preset frame threshold and / or the current vehicle speed is less than the speed calibration value, the instrument cluster cancels the speed warning message. The frame threshold may be 10 frames, which is not specifically limited in this disclosure. Furthermore, except for the preset speed calibration value being less than that of the 4WD Lock mode and the displayed speed warning message, the control method for the drive mode feedback signal of type "4L Mode" is the same as that for the 4WD Lock mode, and is not further described in this disclosure. Among them, the preset vehicle speed calibration value of the 4L mode can be 40km / h, and the displayed vehicle speed warning message can be "Please slow down in 4L mode", which is not specifically limited in this disclosure.

[0084] Figure 3 FIG. 1 is a schematic diagram showing a vehicle signal transmission according to an exemplary embodiment. Figure 3 As shown, the driver's operation of selecting the terrain mode switch triggers a terrain switch mode signal to pass through the body controller via the LIN line. The body controller sends a terrain mode signal corresponding to the terrain switch mode signal via the CAN bus to the body stability system. The body stability system sends a terrain mode request signal corresponding to the terrain mode signal to the transfer case controller. The transfer case controller controls the mechanical locking mechanism to enter a released state or a locked state, or compresses the friction plate according to the terrain mode request signal, and sends a driving mode feedback signal for responding to the terrain mode request signal to the body stability system and the instrument. After receiving the driving mode feedback signal, the body stability system needs to send a corresponding terrain mode request signal to the instrument.

[0085] In order to make it easier for those skilled in the art to understand the method provided by the embodiment of the present disclosure, the following takes the four-wheel drive rock mode request signal as an example to describe in detail the steps of the vehicle control method provided by the embodiment of the present disclosure. Figure 4 As shown, the method includes:

[0086] S401. The vehicle stability system sends a four-wheel drive rock mode request signal to the transfer case controller.

[0087] S402 : After receiving the four-wheel drive rock mode request signal, the transfer case controller sends a mode switching signal to the transmission.

[0088] S403: The transmission is locked in neutral.

[0089] S404: The transfer case controller controls the transfer case transmission mechanism to increase torque at low speed and controls the mechanical locking mechanism to enter a locked state.

[0090] S405 : The transfer case controller sends a driving mode feedback signal of the 4L mode to the vehicle body stability system.

[0091] S406 : The transfer case controller sends a driving mode feedback signal of the 4L mode to the instrument.

[0092] S407: The vehicle body stability system sends a four-wheel drive rock mode request signal to the instrument panel, and the instrument panel displays a text prompt message "Entering Rock Mode".

[0093] S408: The meter obtains the current speed of the vehicle and determines whether the current speed is greater than a preset speed calibration value.

[0094] Furthermore, when the current vehicle speed is greater than the preset vehicle speed calibration value, step S409 is executed; otherwise, step S410 is executed.

[0095] S409. The instrument panel displays the vehicle speed warning message "4L mode, please slow down."

[0096] S410: The instrument panel does not display the vehicle speed warning message "Please slow down in 4L mode."

[0097] S411 : The meter determines whether the number of lost signal frames of the received driving mode feedback signal is greater than a preset frame number threshold.

[0098] Furthermore, if the number of lost signal frames of the driving mode feedback signal is greater than a preset frame number threshold, step S410 is executed; otherwise, step S409 is executed.

[0099] Using this method, when the vehicle stability system sends a terrain mode request signal to the transfer case controller indicating the four-wheel drive rock mode, the transfer case controller first sends a mode switch signal to the transmission, which then locks the transmission in neutral. The transfer case then controls the transfer case's transmission mechanism for low-speed torque boost and locks the mechanical locking mechanism. This maximizes the vehicle's four-wheel drive performance, significantly enhancing its off-road capabilities. Furthermore, the transfer case controller sends drive mode feedback signals to the instrument cluster and stabilizer to alert the driver of the vehicle's drive mode and provides a speed warning in the event of overspeeding, reducing the risk of accidents.

[0100] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A vehicle control method, characterized in that: The method comprises: When a friction plate in a transfer case assembly of the vehicle is in a compressed state, determining whether a temperature of the friction plate is greater than a preset temperature threshold; When the temperature is greater than a preset temperature threshold, the mechanical locking mechanism in the transfer case assembly is controlled to enter a locked state, and the transfer case transmission mechanism in the transfer case assembly is controlled to open the friction plate, wherein, in the locked state, the mechanical locking mechanism locks the transfer case transmission mechanism and the wheel drive mechanism of the vehicle, so that the vehicle is in a four-wheel drive state.

2. The method according to claim 1, characterized in that When the friction plate in the transfer case assembly of the vehicle is in a compressed state, determining whether the temperature of the friction plate is greater than a preset temperature threshold comprises: obtaining a terrain mode request signal of the vehicle; determining a mode type corresponding to the terrain mode request signal; When the mode type is the four-wheel drive standard mode, determining whether the temperature of the friction plate is greater than a preset temperature threshold; When the temperature is less than or equal to a preset temperature threshold, the transfer case transmission mechanism is controlled to compress the friction plate, so that the vehicle enters a four-wheel drive state.

3. The method according to claim 1, characterized in that The method further comprises: After controlling the transfer case transmission mechanism to open the friction plate, timing the heat dissipation time of the friction plate to obtain the heat dissipation time; When the heat dissipation time reaches a preset time threshold, if the vehicle speed is greater than a preset speed threshold, the transfer case transmission mechanism is controlled to press the friction plate, and the mechanical locking mechanism is controlled to enter a released state.

4. The method according to claim 3, characterized in that The timing of the heat dissipation time of the friction plate includes: During the process of timing the heat dissipation time of the friction plate, if a flameout signal of the vehicle is received, the first time duration and the time when the flameout signal occurs are saved; and When the vehicle is ignited, determining a second duration according to the ignition timing and the timing of the ignition-off signal; The sum of the first duration and the second duration is used as the heat dissipation duration.

5. The method according to claim 2, characterized in that The method further comprises: When the mode type is the four-wheel drive mud mode, the four-wheel drive sand mode, the four-wheel drive low-speed mode or the four-wheel drive rock mode, the mechanical locking mechanism is controlled to enter a locking state, so that the vehicle enters the four-wheel drive state.

6. The method according to claim 5, characterized in that When the mode type is the four-wheel drive mud mode, the four-wheel drive sand mode, the four-wheel drive low-speed mode, or the four-wheel drive rock mode, controlling the mechanical locking mechanism to enter the locked state includes: sending a mode switching signal to a transmission of the vehicle when the mode type is a four-wheel drive low speed mode or a four-wheel drive rock mode; After the transmission is locked in neutral according to the mode switching signal, the transfer case transmission mechanism is controlled to increase torque at low speed, and the mechanical locking mechanism is controlled to enter the locked state.

7. The method according to any one of claims 5 or 6, characterized in that The method further comprises: When the mode type is four-wheel drive mud mode, four-wheel drive sand mode, four-wheel drive low-speed mode or four-wheel drive rock mode, if controlling the mechanical locking mechanism to enter the locking state fails, the mode type is changed to four-wheel drive standard mode, and the transfer case transmission mechanism is controlled to press the friction plate, so that the vehicle enters the four-wheel drive state.

8. A vehicle, characterized in that: The vehicle comprises: a transfer case assembly, the transfer case assembly comprising a transfer case controller, a transfer case transmission mechanism, and a mechanical locking mechanism, the transfer case controller being connected to the mechanical locking mechanism, the transfer case transmission mechanism being connected to a torque output end of a transmission of the vehicle, the mechanical locking mechanism being used to lock the transfer case transmission mechanism and a wheel drive mechanism of the vehicle; The transfer case controller is configured to execute the method according to any one of claims 1 to 7.

9. The vehicle according to claim 8, characterized in that The vehicle further includes a vehicle body stabilization system connected to the transfer case controller and an instrument connected to the vehicle body stabilization system; The transfer case controller is further configured to send a driving mode feedback signal to the vehicle body stability system in response to a terrain mode request signal; The vehicle body stabilization system is used to: upon receiving the driving mode feedback signal, determining whether a mode type of the driving mode feedback signal matches a mode type of the terrain mode request signal; When the mode type of the driving mode feedback signal matches the mode type of the terrain mode request signal, controlling the instrument to display terrain mode reminder information corresponding to the mode type of the terrain mode request signal; When the mode type of the driving mode feedback signal does not match the mode type of the terrain mode request signal, the instrument is controlled to display information indicating that the mode type requested by the terrain mode request signal has not been entered.

10. The vehicle according to claim 9, characterized in that The transfer case controller is connected to the meter, and the transfer case controller is further configured to send a driving mode feedback signal to the meter in response to the terrain mode request signal; The instrument is used to: determining a mode type of the driving mode feedback signal upon receiving the driving mode feedback signal; When the driving mode feedback signal indicates a mode type of four-wheel drive mud mode, four-wheel drive sand mode, four-wheel drive low speed mode, or four-wheel drive rock mode, determining whether the current vehicle speed is greater than a speed calibration value corresponding to the mode type; When the current vehicle speed is greater than the calibrated vehicle speed value, a preset vehicle speed warning message is displayed.

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