Vehicle driving mode switching method, system and vehicle

Abstract

The application provides a vehicle driving mode switching method and system and a vehicle, and the method comprises the following steps: in the case that the vehicle is currently in a first driving mode, acquiring a first driving parameter value of the vehicle; when the first driving parameter value exceeds a preset threshold value, acquiring an operating state parameter value of the vehicle; when the operating state parameter value is in a first operating state parameter value range, controlling the vehicle to switch from the first driving mode to a second driving mode corresponding to the first operating state parameter value range, wherein the vehicle is safer in the second driving mode than in the first driving mode within the first operating state parameter value range. The application aims to control the vehicle to switch from the current driving mode to a safer driving mode corresponding to the current driving state parameter of the vehicle according to the operating state parameter of the vehicle, so as to reduce the risk of accidents of the vehicle.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicle engineering, in particular to a vehicle driving mode switching method, system and vehicle. BACKGROUND

[0002] The transfer case is an important component of the automobile power system, and its main function is to distribute power to the front and rear drive shafts, and transmit torque to the four wheels through the main reduction and drive shafts, thereby realizing four-wheel drive. The transfer case usually includes a high-speed drive mode and a low-speed drive mode. The high-speed drive mode includes an intelligent four-wheel drive mode, a high-speed two-wheel drive mode, and a high-speed four-wheel drive mode. By switching the transfer case mode, the power performance and fuel economy of the vehicle in different road conditions can be improved.

[0003] However, different driving modes are suitable for different road conditions, and the existing switching between driving modes requires the driver to judge the road conditions and click the keys to switch between various driving modes. For drivers who are not familiar with different driving modes of the vehicle, it is difficult to accurately switch between various modes according to the judgment of the road conditions. SUMMARY

[0004] Therefore, the present application provides a vehicle driving mode switching method, system and vehicle, which aims to switch the vehicle from the current driving mode to a safer driving mode corresponding to the current driving state parameter of the vehicle according to the running state parameter of the vehicle, so as to reduce the risk of accidents.

[0005] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0006] A vehicle driving mode switching method, the method comprising:

[0007] In the case that the vehicle is currently in a first driving mode, obtaining a first driving parameter value of the vehicle;

[0008] When the first driving parameter value exceeds a preset threshold, obtaining a running state parameter value of the vehicle;

[0009] When the running state parameter value is in a first running state parameter value range, controlling the vehicle to switch from the first driving mode to a second driving mode corresponding to the first running state parameter value range, wherein the vehicle is safer to run in the second driving mode than in the first driving mode within the first running state parameter value range.

[0010] Further, after controlling the vehicle to switch from the first driving mode to the second driving mode corresponding to the first running state parameter value range, the method further comprises:

[0011] When the acquired running state parameter value of the vehicle is in a second running state parameter value range, the vehicle is controlled to switch from the second driving mode to a first driving mode corresponding to the second running state parameter value range, wherein the vehicle is safer in the first driving mode than in the second driving mode in the second running state parameter value range.

[0012] Further, when the vehicle is currently in the first driving mode, before acquiring the first driving parameter value of the vehicle, the method further comprises:

[0013] detecting an opening operation of a professional mode button of the vehicle by a user, the professional mode button being used to control the activation or deactivation of the vehicle driving mode switching method;

[0014] when no opening operation of the professional mode button of the vehicle by the user is detected, starting detection of whether the vehicle is currently in the first driving mode.

[0015] Further, the first driving mode comprises a high-speed four-wheel drive mode, and the second driving mode comprises an intelligent four-wheel drive mode.

[0016] Further, the running state parameter value comprises a yaw angular acceleration of the vehicle, a front-rear wheel speed difference of the vehicle, and a vehicle speed of the vehicle.

[0017] The first running state parameter value range comprises a longitudinal acceleration of the vehicle < 3 m / s2, a yaw angular acceleration of the vehicle < 2 m / s2, a front-rear wheel speed difference of the vehicle < 3.5%, and a vehicle speed of the vehicle ≥ 90 km / h.

[0018] The second running state parameter value range comprises a longitudinal acceleration of the vehicle < 3 m / s2, a yaw angular acceleration of the vehicle < 2 m / s2, a front-rear wheel speed difference of the vehicle < 3.5%, and a vehicle speed of the vehicle ≤ 60 km / h.

[0019] Further, the method further comprises:

[0020] when the first driving parameter value exceeds a preset threshold, outputting corresponding first warning information;

[0021] when the running state parameter value is in the first running state parameter value range, outputting corresponding first prompt information;

[0022] after the vehicle is switched from the first driving mode to the second driving mode, when the acquired running state parameter value of the vehicle is in the second running state parameter value range, outputting corresponding second prompt information.

[0023] The vehicle driving mode switching method has the following advantages:

[0024] The vehicle driving mode switching method provided by the application can switch the vehicle from the first driving mode to the second driving mode corresponding to the current running state parameter value of the vehicle when the first driving mode is locked and the first driving parameter value of the vehicle exceeds the preset threshold, so as to reduce the probability of safety accidents.

[0025] The vehicle driving mode switching method provided by the application can switch the vehicle from the first driving mode to the second driving mode corresponding to the current running state parameter value of the vehicle when the first driving mode is locked and the first driving parameter value of the vehicle exceeds the preset threshold, so as to reduce the probability of safety accidents.

[0026] Another object of the application is to provide a vehicle driving mode switching system, which is used to switch the vehicle from the current driving mode to the safer driving mode corresponding to the current running state parameter of the vehicle according to the running state parameter of the vehicle, so as to reduce the risk of accidents of the vehicle.

[0027] To achieve the above object, the technical scheme of the application is as follows:

[0028] A vehicle driving mode switching system, which comprises:

[0029] A first data acquisition module, which is used to acquire the first driving parameter value of the vehicle when the vehicle is in the first driving mode.

[0030] A second data acquisition module, which is used to acquire the running state parameter value of the vehicle when the first driving parameter value exceeds the preset threshold.

[0031] A control module, which is used to switch the vehicle from the first driving mode to the second driving mode corresponding to the first running state parameter value range when the running state parameter value is in the first running state parameter value range, wherein the vehicle is safer in the second driving mode than in the first driving mode in the first running state parameter value range.

[0032] The vehicle driving mode switching system has the same advantages as the vehicle driving mode switching method, which will not be described here.

[0033] Another object of the application is to provide a vehicle, which is used to switch the vehicle from the current driving mode to the safer driving mode corresponding to the current running state parameter of the vehicle according to the running state parameter of the vehicle, so as to reduce the risk of accidents of the vehicle.

[0034] To achieve the above object, the technical scheme of the present application is as follows:

[0035] A vehicle comprising the vehicle driving mode switching system configured to perform the steps of the vehicle driving mode switching method.

[0036] The vehicle has the same advantages as the vehicle driving mode switching system, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0037] The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the application, and are incorporated herein for explanation by reference. These drawings are not to be construed as limiting the present application, and are included to explain embodiments of the present application and to provide a further understanding of the present application. In the drawings:

[0038] Figure 1 is a flowchart of a vehicle driving mode switching method according to an embodiment of the present application;

[0039] Figure 2 is a control diagram of a vehicle driving mode switching method according to an embodiment of the present application;

[0040] Figure 3 is a schematic diagram of a vehicle driving mode switching system according to an embodiment of the present application;

[0041] Figure 4 is a module connection relationship diagram of a vehicle driving mode switching system according to an embodiment of the present application;

[0042] Figure 5 is a signal representation diagram of a vehicle driving mode switching system according to an embodiment of the present application. DETAILED DESCRIPTION

[0043] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0044] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0045] Embodiment One

[0046] Figure 1 is a flowchart of a vehicle driving mode switching method according to an embodiment of the present application. Referring to Figure 1 , the vehicle driving mode switching method provided by the present application comprises the following steps:

[0047] Step S11: In the case that the vehicle is currently in the first driving mode, the first driving parameter value of the vehicle is obtained.

[0048] In the embodiment, on the vehicle with the time-sharing four-wheel drive function, the vehicle can be manually switched between various drive modes according to the driver's will. However, due to the different ranges of the various drive modes, in a driving state, the selection of the wrong drive mode can cause an accident. Therefore, in the case that the vehicle is currently in the first drive mode, the application starts to detect the first driving parameter value of the vehicle, to determine whether the first driving parameter value of the vehicle in the first drive mode is lower than the preset threshold, to determine whether it is safe for the vehicle to travel in the current first driving parameter value.

[0049] Optionally, in the application, the first driving parameter value is preferably the vehicle speed of the vehicle. In addition, in order to more accurately determine whether it is safe for the vehicle to travel in the current first driving parameter value, the first driving parameter value can include multiple values, specifically including the vehicle speed of the vehicle, the longitudinal acceleration of the vehicle, the yaw angular acceleration of the vehicle, the front-rear wheel speed difference of the vehicle, etc., and the respective preset thresholds are set for the multiple first driving parameter values. When the multiple first driving parameter values are respectively lower than the respective preset thresholds, it is determined that the vehicle is currently in a safe state.

[0050] Step S12: When the first driving parameter value exceeds the preset threshold, an operating state parameter value of the vehicle is obtained.

[0051] In this embodiment, the first driving parameter value is the vehicle speed. In the first drive mode, when the vehicle speed exceeds a preset threshold, there is a certain safety hazard, but it has not yet constituted a substantial safety hazard. Only a warning message needs to be output to the user, prompting them to slow down, and the vehicle's operating status will be continuously monitored. After the user takes the corresponding deceleration action in time, the vehicle can maintain the locked state of the first drive mode. However, if the user does not take the corresponding deceleration action, and the vehicle speed continues to exceed the preset threshold for a certain period of time, or the vehicle continues to accelerate beyond another preset threshold, the first drive mode needs to be unlocked, that is, the current first drive mode needs to be exited, and the vehicle needs to switch to the second drive mode to reduce the probability of an accident. Directly unlocking the first drive mode and switching to the second drive mode when the vehicle speed continues to exceed the preset threshold for a certain period of time or the vehicle continues to accelerate beyond another preset threshold will cause the vehicle to vibrate, impact, or experience torque loss, resulting in a poor driving experience for the driver. Therefore, when the vehicle speed exceeds another preset threshold, and other operating parameters of the vehicle meet specific requirements, the first drive mode is unlocked, and the system switches to the second drive mode. This mechanism effectively prevents vehicle vibration, impacts, and torque loss, providing a better driving experience. Therefore, in the first drive mode, when the vehicle speed exceeds the preset threshold, a warning message is issued, and monitoring of the vehicle's operating parameters is initiated. The other preset threshold is included in the operating parameter values.

[0052] In this embodiment, the preset threshold is preferably 80 km / h, and another preset threshold is set to 9080 km / h. It should be understood that the above preset threshold and the other preset threshold are only the corresponding preferred values, and can be set to other values ​​according to actual needs.

[0053] In this embodiment, when the first driving parameter value includes the above-mentioned multiple different types of state parameters, in the first driving mode, when the multiple first driving parameter values ​​of the vehicle exceed their respective preset thresholds at the same time, the monitoring of the vehicle's operating state parameter value is initiated to obtain the vehicle's operating state parameter value.

[0054] In this application, the method further includes: when the first driving parameter value exceeds a preset threshold, outputting a corresponding first warning message.

[0055] In this embodiment, when the vehicle is currently in the first drive mode and the first driving parameter value exceeds a preset threshold, the vehicle already poses a driving safety hazard. At this time, a warning message can be directly sent to the driver via the vehicle's display instrument panel, indicating that the vehicle speed is too high in the current first drive mode and requesting a reduction in speed. If the driver reduces the speed in time, the subsequent unlocking operation of the first drive mode can be avoided, and the vehicle will remain in the locked state of the first drive mode. However, if the driver does not reduce the speed in time, it is necessary to determine whether to unlock the first drive mode and switch to the safer second drive mode based on the monitored vehicle operating status parameter values.

[0056] Step S13: When the operating status parameter value is within the first operating status parameter value range, control the vehicle to switch from the first driving mode to the second driving mode corresponding to the first operating status parameter value range, wherein the vehicle is safer to operate in the second driving mode than in the first driving mode when it is within the first operating status parameter value range.

[0057] In this embodiment, when multiple operating state parameter values ​​of the vehicle are detected to be within their respective first operating state parameter value ranges, it can be determined that the user has not controlled the vehicle to perform a deceleration operation. At this time, the vehicle speed has reached another preset threshold that allows for a drive mode switch. At the same time, multiple other operating state parameters of the vehicle, excluding the other preset threshold, have also reached a state where a drive mode switch can be performed without causing vibration, impact, or torque loss. At this time, the vehicle is controlled to release the lock on the first drive mode and switch from the first drive mode to a safer second drive mode corresponding to the current first operating state parameter value range, thereby reducing the probability of vehicle accidents.

[0058] In this application, the method further includes: when the running status parameter value is within the first running status parameter value range, outputting a corresponding first prompt message.

[0059] In this embodiment, when the vehicle's operating status parameter value is within the range of the first operating status parameter value obtained through monitoring, the vehicle is controlled to unlock the first driving mode and switch from the first driving mode to the second driving mode. Then, a prompt message indicating that the first driving mode has been unlocked is output on the vehicle's display instrument.

[0060] In this application, the method further includes: when the obtained operating state parameter value of the vehicle is within the range of the second operating state parameter value, controlling the vehicle to switch from the second driving mode to the first driving mode corresponding to the range of the second operating state parameter value, wherein the vehicle is safer to operate in the first driving mode than in the second driving mode when it is within the range of the second operating state parameter value.

[0061] In this embodiment, to prevent a brief misoperation that causes the vehicle speed to exceed a preset threshold while the vehicle's operating status parameters are within the first operating status parameter range, causing the vehicle to switch from the first drive mode to the second drive mode, the vehicle's operating status parameters are continuously monitored in real time after the switch. Once the operating status parameters return to the range suitable for the first drive mode, the vehicle is then switched back from the second drive mode to the first drive mode. In other words, the vehicle is switched back to the first drive mode only when its operating status parameters are within the second operating status parameter range, and the first drive mode lock is restored. This switch back to the first drive mode only when the vehicle's operating status parameters are within the second operating status parameter range is also to prevent vehicle vibration, impact, or torque loss during the switch.

[0062] In this application, the method further includes: after the vehicle switches from the first driving mode to the second driving mode, when the obtained operating status parameter value of the vehicle is within the range of the second operating status parameter value, outputting a corresponding second prompt message.

[0063] In this embodiment, after the vehicle switches from the first drive mode to the second drive mode, the vehicle's operating status parameter values ​​continue to be monitored in real time. When the vehicle's operating status parameter values ​​are detected to be within the range of the second operating status parameter values, the vehicle is controlled to switch from the second drive mode back to the first drive mode. After switching to the first drive mode, the lock state of the first drive mode is restored, and then a prompt message indicating that the lock state of the first drive mode has been restored is output on the vehicle's display instrument panel.

[0064] In this application, before obtaining the first driving parameter value of the vehicle when the vehicle is currently in the first driving mode, the method further includes: detecting the user's activation operation of the expert mode button on the vehicle, the expert mode button being used to control the activation or deactivation of the vehicle driving mode switching method; if no user's activation operation of the expert mode button on the vehicle is detected, initiating the detection of whether the vehicle is currently in the first driving mode.

[0065] In this embodiment, the system detects the user's activation of the expert mode button on the vehicle, which is used to control the activation or deactivation of the vehicle driving mode switching method; if no user activation of the expert mode button is detected, the system then initiates the detection of whether the vehicle is currently in the first driving mode.

[0066] Since the vehicle driving mode switching method described in this application is primarily aimed at drivers who lack sufficient understanding of the vehicle's driving modes or cannot accurately grasp the timing of switching between different driving modes, drivers who are skilled at selecting appropriate times and manually controlling the vehicle's driving modes may not wish to use the method described in this application to switch between the first and second driving modes. Therefore, a separate expert mode button is provided in the vehicle's HUT (Head Unit). When the driver does not activate this expert mode button, the vehicle driving mode switching method described in this application is enabled; when the driver activates the expert mode button, the method is disabled, and the driver continues to manually control the switching between different driving modes. Furthermore, the vehicle's expert mode has higher priority than any driving mode switching command in the all-terrain mode. Therefore, the system first detects whether the user has activated the vehicle's expert mode using the expert mode button. Only when the user has not activated the vehicle's expert mode is the detection of whether the vehicle is currently in the first driving mode initiated, and the first driving parameter value of the vehicle is determined based on the detection result. If the vehicle is not currently in the first drive mode, no further steps are required; if the vehicle is currently in the first drive mode, the first driving parameter value of the vehicle is obtained, and subsequent steps S12-S13 are executed.

[0067] The vehicle driving mode switching method provided by this invention allows drivers who are not familiar with the vehicle's driving modes to, when using the first driving mode lock, control the transfer case to release the lock on the first driving mode after the vehicle's first driving parameter exceeds a preset threshold, and switch from the first driving mode to a safer second driving mode corresponding to the vehicle's current operating state parameter value, thereby reducing the probability of safety accidents.

[0068] The vehicle driving mode switching method provided by this invention improves the accuracy of switching from the first driving mode to the second driving mode by setting a restriction condition when the vehicle's operating state parameter value is within the range of the first operating state parameter value, and reduces the unpleasant driving experience such as shock or torque interruption that may be caused to the driver during the mode switching process.

[0069] Example 2

[0070] In this application, the first drive mode includes a high-speed four-wheel drive mode, and the second drive mode includes an intelligent four-wheel drive mode.

[0071] In this embodiment, the switching between two specific high-speed four-wheel drive modes and intelligent four-wheel drive mode is explained.

[0072] Step S21: When the vehicle is currently in the first driving mode, obtain the first driving parameter value of the vehicle.

[0073] In this embodiment, on a vehicle with part-time four-wheel drive, the driver can manually switch between various driving modes according to their wishes. However, since different driving modes have different applicable ranges, selecting the wrong driving mode in a driving state may lead to accidents. Specifically, the high-speed four-wheel drive mode is mainly suitable for slippery surfaces such as snow, hills, and mud. However, because there is no differential speed between the axles in high-speed four-wheel drive mode, the vehicle's steering and braking performance is significant at high speeds. High-speed driving increases the risk of vehicle resonance or rollover during cornering. Therefore, this application, when the vehicle is currently in high-speed four-wheel drive mode, initiates the detection of the vehicle's first driving parameter value to determine whether the first driving parameter value in high-speed four-wheel drive mode is lower than a preset threshold, thereby determining whether driving the vehicle with the current first driving parameter value is safe.

[0074] Optionally, in this application, since the high-speed four-wheel drive mode is highly sensitive to vehicle speed, the preferred first driving parameter value is the vehicle speed. Furthermore, to more accurately determine whether the vehicle is safe to drive at the current first driving parameter value, multiple first driving parameter values ​​can be selected, including vehicle speed, vehicle longitudinal acceleration, vehicle yaw rate acceleration, and the front-rear wheel speed difference, etc., with each of these first driving parameter values ​​having its own preset threshold. When each of the aforementioned first driving parameter values ​​is lower than its respective preset threshold, the vehicle is determined to be in a safe state.

[0075] Step S22: When the first driving parameter value exceeds the preset threshold, obtain the vehicle's operating status parameter value.

[0076] In this embodiment, the first driving parameter value is the vehicle speed. In high-speed four-wheel drive mode, when the vehicle speed exceeds a preset threshold, there is a certain safety hazard, but it has not yet constituted a substantial safety hazard. Only a warning message needs to be output to the user, prompting them to slow down, and the vehicle's operating status is continuously monitored. After the user takes timely deceleration action, the vehicle can maintain the high-speed four-wheel drive mode lock. However, if the user does not take corresponding deceleration action, and the vehicle speed continues to exceed the preset threshold for a certain period of time, or the vehicle continues to accelerate beyond another preset threshold, the high-speed four-wheel drive mode lock needs to be released, i.e., the current high-speed four-wheel drive mode is exited, and the vehicle switches to intelligent four-wheel drive mode to reduce the probability of an accident. Directly releasing the high-speed four-wheel drive mode lock and switching to intelligent four-wheel drive mode when the vehicle speed continues to exceed the preset threshold for a certain period of time or the vehicle continues to accelerate beyond another preset threshold will cause the vehicle to vibrate, impact, or experience torque loss, resulting in a poor driving experience for the driver. Therefore, when the vehicle speed exceeds another preset threshold, and other vehicle operating parameters meet specific requirements, the high-speed four-wheel drive mode is unlocked, and the system switches to intelligent four-wheel drive mode. This mechanism effectively prevents vehicle vibration, impacts, and torque loss, providing a better driving experience. Therefore, in high-speed four-wheel drive mode, when the vehicle speed exceeds a preset threshold, a warning message is issued, and monitoring of the vehicle's operating parameters is initiated. The other preset threshold is included in the operating parameter values.

[0077] In this embodiment, when the first driving parameter value includes the above-mentioned multiple different types of state parameters, in the first driving mode, when the multiple first driving parameter values ​​of the vehicle exceed their respective preset thresholds at the same time, the monitoring of the vehicle's operating state parameter value is initiated to obtain the vehicle's operating state parameter value.

[0078] In this application, the method further includes: when the first driving parameter value exceeds a preset threshold, outputting a corresponding first warning message.

[0079] In this embodiment, when the vehicle is currently in high-speed four-wheel drive mode and the first driving parameter value exceeds a preset threshold, a driving safety hazard already exists. At this time, a warning message can be directly sent to the driver via the vehicle's display instrument panel, indicating that the vehicle speed is too high in the current high-speed four-wheel drive mode and requesting a reduction in speed. If the driver reduces the speed in time, the subsequent operation to unlock the high-speed four-wheel drive mode can be avoided, and the vehicle will remain in the locked state of high-speed four-wheel drive mode. However, if the driver does not reduce the speed in time, it is necessary to determine whether to unlock the high-speed four-wheel drive mode and switch the high-speed four-wheel drive mode to intelligent four-wheel drive mode based on the monitored vehicle operating status parameter values.

[0080] Step S23: When the operating status parameter value is within the range of the first operating status parameter value, control the vehicle to switch from high-speed four-wheel drive mode to intelligent four-wheel drive mode.

[0081] In this embodiment, when multiple operating state parameter values ​​of the vehicle are detected to be within their respective first operating state parameter value ranges, the vehicle is controlled to release the lock state of the high-speed four-wheel drive mode and the vehicle is controlled to switch from the high-speed four-wheel drive mode to the intelligent four-wheel drive mode.

[0082] In this application, the method further includes: when the running status parameter value is within the first running status parameter value range, outputting a corresponding first prompt message.

[0083] In this embodiment, when the vehicle's operating status parameter value is within the first operating status parameter value range obtained through monitoring, the vehicle is controlled to unlock the high-speed four-wheel drive mode and switch from the high-speed four-wheel drive mode to the intelligent four-wheel drive mode. Then, a prompt message indicating that the high-speed four-wheel drive mode has been unlocked is output on the vehicle's display instrument.

[0084] In this application, the operating state parameter values ​​include: the vehicle's yaw acceleration, the difference in wheel speed between the front and rear wheels, and the vehicle's speed; the range of the first operating state parameter values ​​includes: the vehicle's longitudinal acceleration < 3 m / s². 2 The vehicle's yaw acceleration is <2 m / s². 2 The difference in wheel speed between the front and rear wheels of the vehicle is less than 3.5%, and the vehicle speed is ≥90km / h.

[0085] In this embodiment, the vehicle's operating state parameters include the vehicle's yaw acceleration, the difference in wheel speed between the front and rear wheels, and the vehicle's speed. When the vehicle's longitudinal acceleration is <3 m / s², the parameters are considered to be within the range of yaw acceleration. 2 And the vehicle's yaw acceleration is <2m / s². 2When the front and rear wheel speed difference is less than 3.5% and the vehicle speed is greater than or equal to 90 km / h, the vehicle is unlocked from the high-speed four-wheel drive mode and switched from the high-speed four-wheel drive mode to the intelligent four-wheel drive mode.

[0086] The vehicle driving mode switching method provided by this invention allows drivers who are not familiar with the vehicle's driving modes to, when using the high-speed four-wheel drive mode lock, control the transfer case to release the high-speed four-wheel drive mode lock after the vehicle speed exceeds a certain speed, and switch from the high-speed four-wheel drive mode to the intelligent four-wheel drive mode, thereby realizing inter-axle differential speed, reducing the vehicle's steering braking and reducing the risk of vehicle rollover.

[0087] The vehicle driving mode switching method provided by this invention improves the accuracy of switching between high-speed four-wheel drive mode and intelligent four-wheel drive mode by setting a constraint condition when the vehicle's operating state parameter value is within a first operating state parameter value range, and reduces unpleasant driving experiences such as shocks and torque loss during mode switching. The intelligent four-wheel drive mode is a driving mode in which the vehicle can automatically identify the current driving environment and automatically switch between two-wheel drive and four-wheel drive modes according to the current driving environment.

[0088] In this application, the method further includes: when the obtained operating state parameter value of the vehicle is within the range of the second operating state parameter value, controlling the vehicle to switch from intelligent four-wheel drive mode to high-speed four-wheel drive mode.

[0089] In this embodiment, to prevent a brief misoperation that causes the vehicle speed to exceed a preset threshold while the vehicle's operating status parameters are within the first operating status parameter range, the vehicle switches from high-speed four-wheel drive mode to intelligent four-wheel drive mode. After switching from high-speed four-wheel drive mode to intelligent four-wheel drive mode, the vehicle's operating status parameters are continuously monitored in real time. When the vehicle's operating status parameters return to the range suitable for high-speed four-wheel drive mode, the vehicle switches back from intelligent four-wheel drive mode to high-speed four-wheel drive mode. In other words, when the vehicle speed decreases to the appropriate speed range for high-speed four-wheel drive mode and the vehicle's operating status parameters are within the second operating status parameter range, the vehicle switches back from intelligent four-wheel drive mode to high-speed four-wheel drive mode and restores the high-speed four-wheel drive mode lock. Switching back from intelligent four-wheel drive mode to high-speed four-wheel drive mode when the vehicle's operating status parameters are within the second operating status parameter range is also to avoid vehicle vibration, impact, or torque loss during the switch from intelligent four-wheel drive mode to high-speed four-wheel drive mode.

[0090] In this application, the method further includes: after the vehicle switches from high-speed four-wheel drive mode to intelligent four-wheel drive mode, when the obtained operating status parameter value of the vehicle is within the range of the second operating status parameter value, outputting the corresponding second prompt information.

[0091] In this embodiment, after the vehicle switches from high-speed four-wheel drive mode to intelligent four-wheel drive mode, the vehicle's operating status parameter values ​​continue to be monitored in real time. When the vehicle's operating status parameter values ​​are detected to be within the range of the second operating status parameter values, the vehicle is controlled to switch from intelligent four-wheel drive mode to high-speed four-wheel drive mode. After switching to high-speed four-wheel drive mode, the high-speed four-wheel drive mode lock is restored, and then a prompt message indicating that the high-speed four-wheel drive mode lock has been restored is output on the vehicle's display instrument panel.

[0092] In this application, the range of the second operating state parameters includes: longitudinal acceleration of the vehicle < 3 m / s². 2 The vehicle's yaw acceleration is <2 m / s². 2 The difference in wheel speed between the front and rear wheels of the vehicle is less than 3.5%, and the vehicle speed is ≤60km / h.

[0093] In this embodiment, after the vehicle switches from high-speed four-wheel drive mode to intelligent four-wheel drive mode, the vehicle's operating status parameters continue to be monitored in real time. This is done when the vehicle's longitudinal acceleration is <3m / s². 2 And the vehicle's yaw acceleration is <2m / s². 2 When the front and rear wheel speed difference is less than 3.5% and the vehicle speed is less than or equal to 60 km / h, the vehicle is switched from intelligent four-wheel drive mode to high-speed four-wheel drive mode and the high-speed four-wheel drive mode is locked again.

[0094] In this application, before obtaining the first driving parameter value of the vehicle when the vehicle is currently in high-speed four-wheel drive mode, the method further includes: detecting the user's activation operation of the expert mode button on the vehicle, the expert mode button being used to control the activation or deactivation of the vehicle driving mode switching method; if no user's activation operation of the expert mode button on the vehicle is detected, initiating the detection of whether the vehicle is currently in high-speed four-wheel drive mode.

[0095] In this embodiment, the system detects the user's activation of the expert mode button on the vehicle. The expert mode button is used to control the activation or deactivation of the vehicle driving mode switching method. If no user activation of the expert mode button is detected, the system then initiates the detection of whether the vehicle is currently in high-speed four-wheel drive mode.

[0096] Since the vehicle driving mode switching method described in this application is primarily aimed at drivers who lack sufficient understanding of the vehicle's drive modes or cannot accurately grasp the timing of switching between different drive modes, drivers who are skilled at selecting appropriate times and manually controlling the vehicle's drive modes may not wish to use the vehicle driving mode switching method described in this application to switch between high-speed four-wheel drive mode and intelligent four-wheel drive mode. Therefore, an expert mode button is separately set in the vehicle's HUT (Head Unit). When the driver does not activate the expert mode button, the vehicle driving mode switching method described in this application is enabled; when the driver activates the expert mode button, the vehicle driving mode switching method described in this application is disabled, and the driver continues to manually control the switching between different drive modes. Furthermore, the vehicle's expert mode has higher priority than all drive mode on / off commands in the all-terrain mode. Therefore, the system first detects whether the user has activated the vehicle's expert mode using the expert mode button. Only when the user has not activated the vehicle's expert mode is the detection of whether the vehicle is currently in high-speed four-wheel drive mode initiated, and the first driving parameter value of the vehicle is determined based on the detection result. If the vehicle is not currently in high-speed four-wheel drive mode, no further steps are required; if the vehicle is currently in high-speed four-wheel drive mode, obtain the first driving parameter value of the vehicle and execute subsequent steps S22-S23.

[0097] In this embodiment, Figure 2 This is a control diagram illustrating a vehicle driving mode switching method according to an embodiment of this application. (Refer to...) Figure 2 The system acquires all-terrain mode and expert mode signals emitted by the driver via buttons. The transfer case control unit judges the expert mode signal to determine if it is activated. If activated, the vehicle driving mode switching strategy described above is not used. If not activated, the all-terrain mode signal is used to determine if the vehicle is in high-speed four-wheel drive mode. If not in high-speed four-wheel drive mode, the system returns to acquire all-terrain mode and expert mode signals. If in high-speed four-wheel drive mode, the system checks if the vehicle speed exceeds 80 km / h. If the vehicle speed exceeds 80 km / h, a warning message indicating excessive speed and requesting deceleration is output, while simultaneously acquiring wheel speed and acceleration information. If the vehicle's longitudinal acceleration is <3 m / s², the system continues to acquire these signals. 2 And the vehicle's yaw acceleration is <2m / s². 2If the front and rear wheel speed difference is less than 3.5% and the vehicle speed is ≥90km / h, and the driver does not decelerate in time according to the instructions, a prompt message to release the high-speed four-wheel drive mode lock will be output. The transfer case control unit will then release the high-speed four-wheel drive mode lock. After release, the high-speed four-wheel drive mode will be switched to intelligent four-wheel drive mode. After switching from high-speed four-wheel drive mode to intelligent four-wheel drive mode, the vehicle's operating parameters will continue to be monitored. If the vehicle's longitudinal acceleration is <3m / s², [further action will be taken]. 2 And the vehicle's yaw acceleration is <2m / s². 2 If the front and rear wheel speed difference is less than 3.5% and the vehicle speed is less than or equal to 60 km / h, the transfer case control unit will control the vehicle to switch from intelligent four-wheel drive mode back to high-speed four-wheel drive mode and output a prompt message to restore the lock on high-speed four-wheel drive mode.

[0098] The vehicle driving mode switching method provided by this invention allows drivers who are not familiar with the vehicle's driving modes to, when using the high-speed four-wheel drive mode lock, control the transfer case to release the high-speed four-wheel drive mode lock after the vehicle speed exceeds a certain speed, and switch from the high-speed four-wheel drive mode to the intelligent four-wheel drive mode, thereby realizing inter-axle differential speed, reducing the vehicle's steering braking and reducing the risk of vehicle rollover.

[0099] The vehicle driving mode switching method provided by this invention improves the accuracy of switching between high-speed four-wheel drive mode and intelligent four-wheel drive mode by setting a restriction condition when the vehicle's operating state parameter value is within the range of the first operating state parameter value, and reduces the unpleasant driving experience such as shock and torque interruption brought to the driver during the mode switching process.

[0100] The vehicle driving mode switching method provided by this invention includes an expert mode button. When the expert mode is not activated via the expert mode button, the aforementioned vehicle driving mode switching method is used to meet the driving needs of drivers who are not sufficiently familiar with the vehicle's driving modes. When the expert mode is activated via the expert mode button, the aforementioned vehicle driving mode switching method is disabled to meet the driving needs of drivers who are sufficiently familiar with the vehicle's driving modes.

[0101] This invention also provides a vehicle driving mode switching system. Figure 3 This is a schematic diagram illustrating a vehicle driving mode switching system according to an embodiment of this application. (Refer to...) Figure 3 The vehicle driving mode switching system 300 provided in this application includes:

[0102] The first data acquisition module 301 is used to acquire the first driving parameter value of the vehicle when the vehicle is currently in the first driving mode;

[0103] The second data acquisition module 302 is used to acquire the vehicle's operating status parameter value when the first driving parameter value exceeds a preset threshold.

[0104] Control module 303 is used to control the vehicle to switch from a first driving mode to a second driving mode corresponding to the first driving mode range when the operating state parameter value is within the first operating state parameter value range, wherein the vehicle is safer to operate in the second driving mode than in the first driving mode when the operating state parameter value is within the first operating state parameter value range.

[0105] Optionally, the vehicle driving mode switching system 300 further includes:

[0106] The second control module is used to control the vehicle to switch from a second driving mode to a first driving mode corresponding to the second driving mode when the acquired operating status parameter value of the vehicle is within the range of the second operating status parameter value. The vehicle is safer to operate in the first driving mode than in the second driving mode when it is within the range of the second operating status parameter value.

[0107] Optionally, the system 300 further includes:

[0108] The startup module is used to detect when a user activates the expert mode button on the vehicle, which is used to control the activation or deactivation of the vehicle driving mode switching method; if no user activation operation is detected on the expert mode button, the module initiates the detection of whether the vehicle is currently in the first driving mode.

[0109] Optionally, the operating status parameter values ​​collected by the second data acquisition module 302 include: the vehicle's yaw acceleration, the difference in wheel speed between the front and rear wheels, and the vehicle's speed.

[0110] The range of the first operating state parameter values ​​in the control module 303 includes: longitudinal acceleration of the vehicle < 3m / s2, yaw rate of the vehicle < 2m / s2, front and rear wheel speed difference of the vehicle < 3.5%, and vehicle speed ≥ 90km / h.

[0111] The range of the second operating state parameters in the second control module includes: longitudinal acceleration of the vehicle < 3 m / s2, yaw rate of the vehicle < 2 m / s2, front and rear wheel speed difference of the vehicle < 3.5%, and vehicle speed ≤ 60 km / h.

[0112] Optionally, the vehicle driving mode switching system 300 further includes:

[0113] The first output module is used to output a corresponding first warning message when the first driving parameter value exceeds a preset threshold.

[0114] The second output module is used to output a corresponding first prompt message when the running status parameter value is within the range of the first running status parameter value.

[0115] The third output module is used to output a corresponding second prompt message when the obtained operating status parameter value of the vehicle is within the range of the second operating status parameter value after the vehicle switches from the first driving mode to the second driving mode.

[0116] In this embodiment, Figure 4 This is a module connection diagram illustrating a vehicle driving mode switching system according to an embodiment of this application. Figure 5 This is a signal representation diagram illustrating a module in a vehicle driving mode switching system according to an embodiment of this application. (Refer to...) Figure 4 and Figure 5 The transfer case control unit receives four-wheel speed signals from the electronic stability program, longitudinal acceleration signals and yaw rate acceleration signals from the airbag module, and expert mode signals from the HUT (Hardware Under Test). The transfer case control unit interacts with the instrument cluster and outputs corresponding prompts. The second data acquisition module 302 in this application corresponds to the electronic stability program and the airbag module, and the control module 303 in this application corresponds to the transfer case control unit.

[0117] This invention also provides a vehicle, which may include: the vehicle driving mode switching system described above, used to execute the steps in the vehicle driving mode switching method described above.

[0118] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for switching vehicle driving modes, characterized in that, The method includes: When the vehicle is currently in the first driving mode, obtain the first driving parameter value of the vehicle; When the first driving parameter value exceeds a preset threshold, the operating status parameter value of the vehicle is obtained; When the operating status parameter value is within the first operating status parameter value range, the vehicle is controlled to switch from the first driving mode to the second driving mode corresponding to the first operating status parameter value range. The vehicle is safer to operate in the second driving mode than in the first driving mode when it is within the first operating status parameter value range. When the first driving parameter value is the vehicle speed, the first driving parameter value needs to exceed a preset threshold for a preset duration or exceed a target preset threshold when switching from the first driving mode to the second driving mode. The target preset threshold is greater than the preset threshold.

2. The method according to claim 1, characterized in that, After controlling the vehicle to switch from a first driving mode to a second driving mode corresponding to the range of the first operating state parameter values, the method further includes: When the obtained operating status parameter value of the vehicle is within the range of the second operating status parameter value, the vehicle is controlled to switch from the second driving mode to the first driving mode corresponding to the range of the second operating status parameter value. The vehicle is safer to operate in the first driving mode than in the second driving mode when it is within the range of the second operating status parameter value.

3. The method according to claim 1, characterized in that, Before obtaining the first driving parameter value of the vehicle when the vehicle is currently in the first driving mode, the method further includes: The system detects the user's activation of the expert mode button on the vehicle, which is used to control the activation or deactivation of the vehicle driving mode switching method. If no user is detected performing an activation operation on the expert mode button of the vehicle, a detection is initiated to determine whether the vehicle is currently in the first driving mode.

4. The method according to claim 1, characterized in that, The first drive mode includes a high-speed four-wheel drive mode, and the second drive mode includes an intelligent four-wheel drive mode.

5. The method according to claim 4, characterized in that, The operating status parameter values ​​include: vehicle yaw acceleration, front and rear wheel speed difference, and vehicle speed. The range of the first operating state parameter values ​​includes: longitudinal acceleration of the vehicle < 3m / s². 2 The vehicle's yaw acceleration is <2 m / s². 2 The difference in wheel speed between the front and rear wheels of the vehicle is less than 3.5%, and the vehicle speed is greater than or equal to 90 km / h. The second operating state parameter range includes: longitudinal acceleration of the vehicle < 3 m / s² 2 The vehicle's yaw acceleration is <2 m / s². 2 The difference in wheel speed between the front and rear wheels of the vehicle is less than 3.5%, and the vehicle speed is less than or equal to 60 km / h.

6. The method according to claim 1, characterized in that, The method further includes: When the first driving parameter value exceeds the preset threshold, the corresponding first warning message is output; When the running status parameter value is within the first running status parameter value range, the corresponding first prompt message is output; After the vehicle switches from the first driving mode to the second driving mode, when the obtained operating status parameter value of the vehicle is within the range of the second operating status parameter value, the corresponding second prompt information is output.

7. A vehicle driving mode switching system, characterized in that, The system includes: The first data acquisition module is used to acquire the first driving parameter value of the vehicle when the vehicle is currently in the first driving mode; The second data acquisition module is used to acquire the vehicle's operating status parameter value when the first driving parameter value exceeds a preset threshold. The control module is used to control the vehicle to switch from a first driving mode to a second driving mode corresponding to the first driving state parameter value range when the operating state parameter value is within the first operating state parameter value range. The second driving mode is safer than the first driving mode when the vehicle is within the first operating state parameter value range. When the first driving parameter value is the vehicle speed, switching from the first driving mode to the second driving mode requires either the first driving parameter value exceeding a preset threshold for a preset duration or the first driving parameter value exceeding a target preset threshold, where the target preset threshold is greater than the preset threshold.

8. A vehicle, characterized in that, The vehicle includes a system as described in claim 7, configured to perform the steps in the vehicle driving mode switching method as described in any one of claims 1-6.

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