Driving mode switching method and device of vehicle, vehicle and storage medium

Abstract

The invention provides a driving mode switching method and device of a vehicle, the vehicle and a storage medium, and belongs to the technical field of automobiles. The method comprises the steps that when the vehicle receives a starting request of an engine in a pure electric mode, an available flag bit of a direct drive mode of the vehicle is determined according to running parameters of the vehicle; according to the driving parameters and the available flag bit of the direct drive mode, determining the available flag bit of the sliding friction starting mode of the vehicle; when the available flag bit of the sliding friction starting mode and the available flag bit of the direct drive mode of the vehicle meet preset conditions, determining that the target drive mode of the vehicle is the direct drive mode; and based on the sliding friction starting mode, an engine is controlled to be started, so that the driving mode of the vehicle is switched from a pure electric mode to a direct drive mode. By means of the scheme, when the engine is started, the vehicle is directly switched from the pure electric mode to the direct drive mode, the power running of the whole vehicle at the starting moment is guaranteed, and the driving experience of a driver is optimized.

Description

Technical Field

[0001] The present application belongs to the field of automobile technology, and in particular, relates to a vehicle driving mode switching method, device, vehicle and storage medium. Background Art

[0002] In order to comply with the concept of sustainable development, the automotive industry is also paying more and more attention to the development of new energy vehicles. Hybrid vehicles add electric assistance on the basis of retaining the power provided by the engine, which can achieve pure electric drive, pure oil drive and dual-power hybrid drive. The common driving modes in current hybrid vehicles mainly include pure electric mode, series mode and direct drive mode.

[0003] The vehicle can switch between different driving modes according to different driving needs. When the vehicle starts the engine in pure electric mode, a quick start method is used. In the quick start method, the vehicle's driving mode can only be switched from pure electric mode to series mode, resulting in insufficient power during the mode switching process and poor driving experience for the driver. Summary of the invention

[0004] The purpose of the present application is to provide a vehicle driving mode switching method, device, vehicle and storage medium, aiming to solve the problem of insufficient power when a traditional hybrid vehicle switches driving modes.

[0005] A first aspect of an embodiment of the present application provides a method for switching a driving mode of a vehicle, the method comprising:

[0006] When the vehicle receives an engine start request in the pure electric mode, determining an available flag position of the direct drive mode of the vehicle according to the driving parameters of the vehicle;

[0007] Determining an available flag position of a sliding friction start mode of the vehicle according to the driving parameter and an available flag position of the direct drive mode;

[0008] When the available flag position of the sliding friction start mode and the available flag position of the direct drive mode of the vehicle meet preset conditions, determining that the target drive mode of the vehicle is the direct drive mode;

[0009] Based on the slippery start mode, the engine is controlled to start so that the driving mode of the vehicle is switched from a pure electric mode to a direct drive mode.

[0010] In some embodiments, when the available flag position of the sliding friction start mode and the available flag position of the direct drive mode of the vehicle meet preset conditions, determining that the target drive mode of the vehicle is the direct drive mode includes:

[0011] When the available flag position of the sliding friction start mode and the available flag position of the direct drive mode of the vehicle meet the preset conditions, determining the available flag positions of the pure electric mode and the series mode according to the driving parameters of the vehicle;

[0012] When the available flag bit of the pure electric mode indicates that the pure electric mode is not available, and the available flag bit of the series mode indicates that the series mode is not available, it is determined that the target driving mode of the vehicle is the direct driving mode.

[0013] In some embodiments, the method further comprises:

[0014] When the available flag bit of the pure electric mode indicates that the pure electric mode is available, determining that the target driving mode of the vehicle is the pure electric mode; or,

[0015] When the available flag bit of the pure electric mode indicates that the pure electric mode is not available, and the available flag bit of the series mode indicates that the series mode is not available, it is determined that the target driving mode of the vehicle is the direct driving mode.

[0016] In some embodiments, the method further comprises:

[0017] When the actual driving mode of the vehicle is the pure electric mode, the engine start mode is the quick start mode, and the available flag of the direct drive mode indicates that the direct drive mode is available, determining that the available flag of the series mode indicates that the series mode is available; or,

[0018] When the actual driving mode of the vehicle is the pure electric mode, and the engine start-stop requirement is a start requirement, and the available flag of the direct drive mode indicates that the direct drive mode is not available, determining that the available flag of the series mode indicates that the series mode is available; or,

[0019] When the actual driving mode of the vehicle is the direct driving mode, and the available flag of the direct driving mode indicates that the direct driving mode is not available, determining that the available flag of the series mode indicates that the series mode is available; or,

[0020] When the actual driving mode of the vehicle is the series mode, and the available flag of the direct drive mode indicates that the direct drive mode is not available, and the operating state of the engine is normal operation, it is determined that the available flag of the series mode indicates that the series mode is available.

[0021] In some embodiments, the driving parameters include engine speed, vehicle speed and gear information of the vehicle;

[0022] The determining, according to the driving parameters of the vehicle, an available flag position of the direct drive mode of the vehicle comprises:

[0023] If the engine speed is within a preset speed range, and the vehicle speed is within a first preset vehicle speed range, and the gear information indicates that the vehicle is currently in a forward gear, and the difference between the engine speed and the engine speed limit value is less than a preset difference, determining that the direct drive mode is available flag indicates that the direct drive mode is available.

[0024] In some embodiments, the driving parameters include driving mode, vehicle speed, front axle gear information, drive mode and accelerator pedal opening;

[0025] The step of determining the available flag position of the sliding friction start mode of the vehicle according to the driving parameter and the available flag position of the direct drive mode includes:

[0026] If the driving mode is the four-wheel drive mode, and the vehicle speed is within the second preset vehicle speed, and the available flag of the direct drive mode indicates that the direct drive mode is available, and the front axle gear information indicates that the front axle gear is the target gear, and the driving mode of the vehicle is the pure electric four-wheel drive mode or the pure electric front-wheel drive mode; and the accelerator pedal opening is greater than the preset opening, it is determined that the available flag of the slippery start mode indicates that the slippery start mode is available.

[0027] In some embodiments, the method further comprises:

[0028] When the engine fails to start, determining the direct drive mode as an unavailable drive mode;

[0029] Determine that the target driving mode of the vehicle is a pure electric mode.

[0030] A second aspect of an embodiment of the present application provides a driving mode switching device for a vehicle, the device comprising:

[0031] a first determining unit, configured to determine an available flag position of a direct drive mode of the vehicle according to a driving parameter of the vehicle when the vehicle receives an engine start request in a pure electric mode;

[0032] A second determining unit, configured to determine an available flag position of a sliding friction start mode of the vehicle according to the driving parameter and an available flag position of the direct drive mode;

[0033] a third determining unit, configured to determine that the target driving mode of the vehicle is the direct driving mode when an available flag position of the sliding friction starting mode and an available flag position of the direct driving mode of the vehicle meet a preset condition;

[0034] A control unit is used to control the engine start-up based on the sliding friction starting method so that the driving mode of the vehicle is switched from a pure electric mode to a direct drive mode.

[0035] In some embodiments, the third determination unit is used to determine the available flags of the pure electric mode and the series mode according to the driving parameters of the vehicle when the available flag of the sliding start mode and the available flag of the direct drive mode of the vehicle meet preset conditions; when the available flag of the pure electric mode indicates that the pure electric mode is not available, and the available flag of the series mode indicates that the series mode is not available, determine that the target drive mode of the vehicle is the direct drive mode.

[0036] In some embodiments, the third determination module is configured to determine that the target driving mode of the vehicle is the pure electric mode when the available flag of the pure electric mode indicates that the pure electric mode is available; or

[0037] The third determination module is used to determine that the target driving mode of the vehicle is the direct drive mode when the available flag bit of the pure electric mode indicates that the pure electric mode is not available and the available flag bit of the series mode indicates that the series mode is not available.

[0038] In some embodiments, the apparatus further comprises:

[0039] a fourth determining unit, configured to determine that the available flag bit of the series mode indicates that the series mode is available when the actual driving mode of the vehicle is the pure electric mode, the engine start mode is the quick start, and the available flag bit of the direct drive mode indicates that the direct drive mode is available; or

[0040] The fourth determining unit is used to determine that the available flag bit of the series mode indicates that the series mode is available when the actual driving mode of the vehicle is the pure electric mode, the engine start-stop requirement is a start requirement, and the available flag bit of the direct drive mode indicates that the direct drive mode is not available; or,

[0041] The fourth determining unit is configured to determine that the available flag bit of the series mode indicates that the series mode is available when the actual driving mode of the vehicle is the direct driving mode and the available flag bit of the direct driving mode indicates that the direct driving mode is not available; or

[0042] The fourth determination unit is used to determine that the available flag bit of the series mode indicates that the series mode is available when the actual driving mode of the vehicle is the series mode, the available flag bit of the direct drive mode indicates that the direct drive mode is not available, and the operating state of the engine is normal operation.

[0043] In some embodiments, the driving parameters include engine speed, vehicle speed and gear information of the vehicle;

[0044] The first determination unit is used to determine that the available flag of the direct drive mode indicates that the direct drive mode is available if the engine speed is within a preset speed range, the vehicle speed is within a first preset vehicle speed range, the gear information indicates that the vehicle is currently in a forward gear, and the difference between the engine speed and the engine speed limit value is less than a preset difference.

[0045] In some embodiments, the driving parameters include driving mode, vehicle speed, front axle gear information, drive mode and accelerator pedal opening;

[0046] The second determination unit is used to determine that if the driving mode is the four-wheel drive mode, and the vehicle speed is within a second preset vehicle speed, and the available flag of the direct drive mode indicates that the direct drive mode is available, and the front axle gear information indicates that the front axle gear is the target gear, and the driving mode of the vehicle is the pure electric four-wheel drive mode or the pure electric front-wheel drive mode; and the accelerator pedal opening is greater than the preset opening, the available flag of the slippery start mode indicates that the slippery start mode is available.

[0047] In some embodiments, the apparatus further comprises:

[0048] The fifth determination unit is used to determine that the direct drive mode is an unavailable drive mode when the engine fails to start; and determine that the target drive mode of the vehicle is a pure electric mode.

[0049] A third aspect of an embodiment of the present application provides a vehicle, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the driving mode switching method of the vehicle as described above when executing the computer program.

[0050] A fourth aspect of an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the vehicle driving mode switching method as described above is implemented.

[0051] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0052] In an embodiment of the present application, when receiving an engine start request, it is determined whether the direct drive mode and the sliding friction start mode are available, the start mode of the vehicle's current engine is determined according to whether the vehicle's sliding friction start mode is available, and the vehicle's final target drive mode is determined in combination with the engine start mode, so that the vehicle is driven according to the target drive mode. In this way, when both the sliding friction start mode and the direct drive mode are available, the engine can be started by the sliding friction start mode. Since the front axle motor is kept in a driving state during the process of starting the engine by the sliding friction mode, it is ensured that the front axle motor continuously outputs driving torque, so that the motor can drive without interruption and the engine can be started at the same time. Therefore, when switching from pure electric mode to direct drive mode, there is no need to switch from pure electric mode to series mode first, so that the vehicle can directly switch from pure electric mode to direct drive mode, which simplifies the process of switching the vehicle from pure electric mode to series mode and then from series mode to direct drive mode, and prevents the problem of insufficient power of the vehicle in series mode, thereby ensuring the power of the entire vehicle at the start time and optimizing the driving experience of the driver. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 A schematic diagram showing a system involved in a method for switching a vehicle driving mode provided by an exemplary embodiment;

[0054] Figure 2 A schematic flow chart of a method for switching a vehicle startup mode provided by an exemplary embodiment is shown;

[0055] Figure 3 A schematic flow chart of a method for switching driving modes according to the priority of driving modes in a vehicle provided by an exemplary embodiment is shown;

[0056] Figure 4 A logic diagram of selecting a target driving mode according to a priority level provided by an exemplary embodiment is shown;

[0057] Figure 5 A schematic structural diagram of a vehicle startup mode switching device provided by an exemplary embodiment is shown;

[0058] Figure 6 It is a schematic diagram of the structure of a vehicle provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0059] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0060] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0061] Since traditional energy such as oil is a non-renewable energy, vehicles that use traditional energy such as oil as a power source do not conform to the concept of sustainable development. In order to conform to the concept of sustainable development, the automotive industry pays more and more attention to the development of new energy vehicles. Hybrid vehicles achieve the purpose of oil and electricity by adding a hybrid power system to the original traditional power system, and have become one of the current mainstream models due to their low fuel consumption and high driving performance.

[0062] Hybrid vehicles (HEVs) retain the power provided by the engine and add electric assistance, which can achieve pure electric drive, pure oil drive and dual-power hybrid drive. The common driving modes of hybrid vehicles currently include pure electric mode (EV), series mode and direct drive mode.

[0063] The vehicle can switch between different driving modes according to different driving needs. When it is necessary to switch from pure electric mode to direct drive mode, the vehicle needs to switch from pure electric mode to series mode first, and then switch from series mode to direct drive mode, resulting in insufficient power and poor driving experience for the driver during the mode switching process.

[0064] In order to ensure the power of the vehicle during the drive mode switching process, the present application provides a vehicle drive mode switching method, a vehicle and a storage medium. When receiving an engine start request, it is determined whether the direct drive mode and the sliding friction start mode are available, and the start mode of the vehicle's current engine is determined according to whether the vehicle's sliding friction start mode is available. The vehicle's final target drive mode is determined in combination with the engine start mode, so that the vehicle is driven according to the target drive mode. In this way, when both the sliding friction start mode and the direct drive mode are available, the engine can be started by the sliding friction start mode, so that the vehicle can be directly switched from pure electric mode to direct drive mode, simplifying the process of switching the vehicle from pure electric mode to series mode and then from series mode to direct drive mode, preventing the problem of insufficient power of the vehicle in series mode, thereby ensuring the power of the entire vehicle at the start time and optimizing the driver's driving experience.

[0065] See also Figure 1 , which shows a schematic diagram of a system involved in a vehicle driving mode switching method provided by an exemplary embodiment. Figure 1The system includes: a driving parameter sensing system 10 and a vehicle controller 20. The driving parameter sensing system 10 and the vehicle controller 20 are in communication connection.

[0066] The driving parameter perception system 10 is used to obtain the driving parameters of the vehicle and send the driving parameters to the vehicle controller 20. The driving parameter perception system 10 includes a variety of sensors or other devices for obtaining different driving parameters of the vehicle. For example, the driving parameter perception system 10 includes a vehicle speed sensor for detecting the driving speed of the vehicle and sending the driving speed of the vehicle to the vehicle controller 20. The driving parameter perception system 10 also includes a speed sensor for detecting the engine speed of the vehicle and sending the engine speed of the vehicle to the vehicle controller 20. The driving parameter perception system 10 also includes an opening sensor for detecting the throttle opening of the vehicle and sending the throttle opening to the vehicle controller 20. The driving parameter perception system 10 also includes a gear information acquisition unit for detecting the gear information of the front and rear axles of the vehicle and sending the detected front and rear axle gear information to the vehicle controller 20. The driving parameter perception system 10 may include more or fewer devices, which are not specifically limited in the embodiments of the present application.

[0067] The vehicle controller 20 is used to receive the driving parameters of the vehicle sent by the driving parameter sensing system 10. When a request for starting the engine is received, the target driving mode of the vehicle is determined according to the received driving parameters, and the vehicle driving is controlled based on the target driving mode.

[0068] The vehicle startup mode switching method provided by the present application is described below in conjunction with specific embodiments. Figure 2 , which shows a flow chart of a method for switching a vehicle startup mode provided by an exemplary embodiment. As an example and not a limitation, the method is applied to a vehicle.

[0069] S201, when the vehicle receives an engine start request in the pure electric mode, the vehicle determines an available flag position of the direct drive mode of the vehicle according to the driving parameters of the vehicle.

[0070] The start request may be automatically triggered by the vehicle or manually triggered by the driver, and this is not specifically limited in the embodiments of the present application. For example, the request to start the engine may be triggered by the automatic start-stop function of the vehicle. When the vehicle is waiting for a signal or parking, the automatic start-stop function will shut down the engine to save fuel, and when the vehicle needs to continue driving, the automatic start-stop function will restart the engine. When the system detects that the engine is turned off, it will prompt the driver to manually start the engine, etc.

[0071] When the vehicle receives an engine start request, the vehicle's driving parameters are obtained, and whether the vehicle's direct drive mode is available is determined based on the vehicle's driving parameters. The available flag of the direct drive mode is set based on the determination result of whether the direct drive mode is available.

[0072] Among them, the correspondence between the available flag bit of the direct drive mode and whether the direct drive mode is available can be set as needed, and is not specifically limited in the embodiments of the present application. For example, when the direct drive mode is available, the available flag bit of the direct drive mode can be set to 1, and when the direct drive mode is not available, the available flag bit of the direct drive mode can be set to 0.

[0073] In some embodiments, the vehicle can determine whether the direct drive mode is available based on driving parameters such as engine speed, vehicle speed and gear information. That is, the vehicle can determine whether the direct drive mode is available by respectively judging whether the driving parameters such as engine speed, vehicle speed and gear information meet the preset conditions. Accordingly, the driving parameters include the engine speed, vehicle speed and gear information of the vehicle; this step includes: if the engine speed is within the preset speed range, and the vehicle speed is within the first preset speed range, and the gear information indicates that the vehicle is currently in the forward gear, and the difference between the engine speed and the engine speed limit value is less than the preset difference, the vehicle determines that the available flag of the direct drive mode indicates that the direct drive mode is available.

[0074] The engine speed can be read by a speed sensor. The engine speed can also be calculated based on the front axle gear and vehicle speed of the vehicle. In the embodiment of the present application, the method for obtaining the engine speed is not specifically limited. The preset speed range can be a range greater than N1 and less than N2. The values ​​of N1 and N2 can be set as needed. In the embodiment of the present application, the values ​​of N1 and N2 are not specifically limited. For example, N1 can be 1500 rpm, N2 can be 4000 rpm, etc.

[0075] The vehicle speed can be read from the vehicle speed sensor. In the embodiment of the present application, the method for obtaining the vehicle speed is not specifically limited. The first preset vehicle speed range can be a range greater than V1 and less than V2. Among them, the values ​​of V1 and V2 can be set as needed. In the embodiment of the present application, the values ​​of V1 and V2 are not specifically limited. For example, V1 can be 30 kilometers per hour, V2 can be 200 kilometers per hour, etc.

[0076] The vehicle can read the gear information of the vehicle through the domain controller. The speed limit value of the engine can be determined according to the attribute information of the engine. The preset difference can be set as needed. In the embodiment of the present application, the preset difference is not specifically limited. For example, the preset difference can be 200 rpm, 500 rpm, etc.

[0077] S202, the vehicle determines an available flag position of the sliding friction start mode of the vehicle according to the driving parameter and the available flag position of the direct drive mode.

[0078] The slip start method refers to the method in which, at the initial stage of engine startup, the clutch plate and the engine flywheel are driven by an electric motor to slip, thereby gradually increasing the engine speed to above idle speed, and ultimately achieving a smooth start of the engine.

[0079] After determining the available flag of the direct drive mode, the vehicle determines whether the slipping start mode is available based on the available flag of the direct drive mode and the driving parameters of the vehicle, and sets the available flag of the slipping start mode according to the judgment result of whether the slipping start mode is available.

[0080] The correspondence between the available flag of the sliding friction start mode and whether the sliding friction drive mode is available can be set as needed, and is not specifically limited in the embodiment of the present application. For example, when the sliding friction start mode is available, the available flag of the sliding friction start mode can be set to 1, and when the sliding friction start mode is not available, the available flag of the sliding friction start mode can be set to 0.

[0081] In some embodiments, the vehicle can determine whether the slipping start mode is available based on driving parameters such as driving mode, vehicle speed, front axle gear information, drive mode and accelerator pedal opening. That is, the vehicle determines whether the driving mode, vehicle speed, front axle gear information, drive mode and accelerator pedal opening meet the preset conditions to determine whether the slipping start mode is available. Correspondingly, the driving parameters include driving mode, vehicle speed, front axle gear information, drive mode and accelerator pedal opening; this step includes: if the driving mode is a four-wheel drive mode, and the vehicle speed is within the second preset vehicle speed, and the available flag of the direct drive mode indicates that the direct drive mode is available, and the front axle gear information indicates that the front axle gear is the target gear, and the driving mode of the vehicle is a pure electric four-wheel drive mode or a pure electric front drive mode; and the accelerator pedal opening is greater than the preset opening, determining that the available flag of the slipping start mode indicates that the slipping start mode is available.

[0082] The driving mode refers to the mode selected by the driver according to factors such as the current road conditions, for example, normal mode, four-wheel drive mode, snow and mud mode, etc. The vehicle can directly read the current posture mode through the vehicle controller. The method for the vehicle to obtain the vehicle speed is the same as the principle of obtaining the vehicle speed in step S201, which will not be repeated here. The second preset vehicle speed range can be a range greater than V3 and less than V4. Among them, the values ​​of V3 and V4 can be set as needed. In the embodiment of the present application, the values ​​of V3 and V4 are not specifically limited. For example, V3 can be 25 kilometers per hour, V4 can be 85 kilometers per hour, etc.

[0083] The front axle gear can obtain the front and rear axle states of the vehicle through the vehicle controller, and determine the front axle gear information based on the front and rear axle states of the vehicle. The target gear can be 1st gear or 2nd gear. The driving mode of the vehicle can be obtained through the vehicle controller. The accelerator pedal opening can be obtained through an opening sensor, or the accelerator pedal opening can be read by the vehicle controller. In the embodiment of the present application, there is no specific limitation on the way in which the vehicle obtains the accelerator pedal opening. The preset opening can also be set as needed. In the embodiment of the present application, there is no specific limitation on the accelerator pedal opening. For example, the preset opening can be 25%, 20%, etc.

[0084] S203: When the available flag position of the sliding friction start mode and the available flag position of the direct drive mode of the vehicle meet preset conditions, determining that the target drive mode of the vehicle is the direct drive mode.

[0085] Among them, the available flag bit of the sliding friction start mode and the available flag bit of the direct drive mode satisfying the preset condition means that the available flag bit of the sliding friction start mode indicates that the sliding film start mode is available, and the available flag bit of the direct drive mode indicates that the direct drive mode is available. Accordingly, when the vehicle receives a request to start the engine in the pure electric mode, if the sliding friction start mode is available and the direct drive mode of the vehicle is available, the vehicle can use the direct drive mode as the target drive mode of the vehicle.

[0086] One thing that needs to be explained is that the vehicle can choose to use a variety of engine starting methods, for example, the engine starting methods include: slippery start, starter start, quick start, etc. When the vehicle determines that the slippery start method is available, the slippery start method is used first. When the slippery start method is available and the direct drive mode is available, the vehicle can use the slippery start method to start the engine, thereby switching from pure electric mode to direct drive mode. In this way, by selecting the engine starting method to control the switching of the drive mode, the vehicle can directly switch from pure electric mode to direct drive mode when the engine is started, ensuring the power of the entire vehicle at the start time and optimizing the driver's driving experience.

[0087] One point that needs to be explained is that when the vehicle switches to the direct drive mode, the vehicle can also switch from the series mode to the direct drive mode. Accordingly, when the actual driving mode of the vehicle is the series mode and the available flag of the direct drive mode indicates that the direct drive mode is available, the direct drive mode is determined to be an available driving mode.

[0088] S204, the vehicle controls the engine to start based on the sliding friction starting method, so that the driving mode of the vehicle is switched from the pure electric mode to the direct drive mode.

[0089] Through the sliding start method, an electric motor is used to drive the clutch plate and the engine flywheel to slide, thereby gradually increasing the engine speed to above idle speed, and finally achieving a smooth start of the engine. In this way, during the process of starting the engine, the front axle motor can remain in a driving state, thereby ensuring that the front axle motor continues to output driving torque, so that the motor can drive without interruption. Therefore, in the process of switching from pure electric mode to direct drive mode, there is no need to switch to series mode first, drive the motor terminal, and then switch to direct drive mode. In this way, the engine can be started at the same time, thereby achieving a direct switch from pure electric mode to direct drive mode.

[0090] After the vehicle determines that the target drive mode is the direct drive mode, the engine start is controlled by the sliding start method, and the engine status is monitored. When it is detected that the engine is successfully started, that is, the engine is in normal operation, the vehicle continues to be controlled to switch the drive mode from the pure electric mode to the direct drive mode. When the engine fails to start, the vehicle restores the pure electric mode as the vehicle's drive mode. Accordingly, when the engine fails to start, the vehicle determines that the direct drive mode is an unavailable drive mode; and determines that the target drive mode of the vehicle is the pure electric mode.

[0091] The vehicle can determine whether the engine fails to start by detecting the vehicle's shutdown type, and when the shutdown type is not equal to 0, it is determined that the engine fails to start. The shutdown type includes normal shutdown, fault shutdown, idle shutdown, and automatic shutdown.

[0092] During the mode switching process, when it is determined that the engine start fails, the drive mode is set back to an unavailable state and the vehicle's target drive mode is set to pure electric mode. In this way, when it is determined that the engine start fails, the drive mode reset is triggered, so that the drive mode switching process follows the engine start-stop function processing.

[0093] In some embodiments, the vehicle can implement a drive mode reset process through a Set / Reset (SR) trigger. When it is determined that the target drive mode is the direct drive mode, the SR trigger can be set to a trigger state, and when it is determined that the engine start fails, the SR trigger is set to a reset state. When the SR trigger is in the reset state, the vehicle maintains the original drive mode.

[0094] In the present implementation, in the event of a failure in switching from pure electric mode to direct drive mode, whether the drive mode has been switched successfully is determined by judging whether the engine has started successfully or failed. In this way, it is only necessary to judge whether the engine has started successfully, and there is no need to separately judge whether the drive mode switching process is successful. Therefore, there is no need to perform a separate timeout processing for the mode switching, which simplifies the processing flow. In addition, when the engine fails to start, the drive mode is promptly restored to the pure electric mode, which prevents the drive mode from being stuck due to abnormal circumstances and the inability to switch normally, thereby improving the reliability of the vehicle.

[0095] In an embodiment of the present application, when receiving an engine start request, it is determined whether the direct drive mode and the sliding friction start mode are available, the start mode of the vehicle's current engine is determined according to whether the vehicle's sliding friction start mode is available, and the vehicle's final target drive mode is determined in combination with the engine start mode, so that the vehicle is driven according to the target drive mode. In this way, when both the sliding friction start mode and the direct drive mode are available, the engine can be started by the sliding friction start mode. Since the front axle motor is kept in a driving state during the process of starting the engine by the sliding friction mode, it is ensured that the front axle motor continuously outputs driving torque, so that the motor can drive without interruption and the engine can be started at the same time. Therefore, when switching from pure electric mode to direct drive mode, there is no need to switch from pure electric mode to series mode first, so that the vehicle can directly switch from pure electric mode to direct drive mode, which simplifies the process of switching the vehicle from pure electric mode to series mode and then from series mode to direct drive mode, and prevents the problem of insufficient power of the vehicle in series mode, thereby ensuring the power of the entire vehicle at the start time and optimizing the driving experience of the driver.

[0096] Since a vehicle generally supports multiple driving modes, when these driving modes are available, the vehicle generally determines the target driving mode according to a preset priority. In some embodiments, the vehicle can determine whether multiple driving modes are available, and when it is determined that there are multiple available driving modes, the vehicle can select the driving mode with the highest priority from the multiple available driving modes as the target driving mode according to the preset priority. Figure 3 , which shows a flow chart of a method for switching driving modes according to the priority of driving modes in a vehicle provided by an exemplary embodiment. As an example and not a limitation, the method is applied to a vehicle.

[0097] S301, when the vehicle receives an engine start request in the pure electric mode, the vehicle determines an available flag position of the direct drive mode of the vehicle according to the driving parameters of the vehicle.

[0098] The principle of this step is the same as that of step S201 and will not be repeated here.

[0099] S302, the vehicle determines the available flag position of the sliding friction starting mode of the vehicle according to the driving parameter and the available flag position of the direct drive mode.

[0100] The principle of this step is the same as that of step S202 and will not be repeated here.

[0101] S303, when the available flag position of the sliding friction start mode and the available flag position of the direct drive mode of the vehicle meet the preset conditions, the available flag positions of the pure electric mode and the series mode are determined according to the driving parameters of the vehicle.

[0102] The following describes the determination methods for different driving modes.

[0103] In some embodiments, when the actual driving mode of the vehicle is the pure electric mode, and the engine start mode is quick start, and the available flag of the direct drive mode indicates that the direct drive mode is available, it is determined that the available flag of the series mode indicates that the series mode is available.

[0104] When the available flag of the sliding friction start mode indicates that the sliding film start mode is not available, the engine start mode is determined to be a quick start. That is, in pure electric mode, when the sliding friction start mode is not available, even if the direct drive mode is available, the vehicle cannot directly switch to the direct drive mode, but switches to the series mode.

[0105] In some embodiments, when the actual driving mode of the vehicle is the pure electric mode, and the engine start-stop requirement is a start requirement, and the available flag of the direct drive mode indicates that the direct drive mode is not available, it is determined that the available flag of the series mode indicates that the series mode is available.

[0106] The engine start demand is start demand means that the engine start type is not equal to 0. That is, in pure electric mode, when the engine has a start demand, if the direct drive mode is not available, the vehicle cannot directly switch to the direct drive mode, but switches to the series mode.

[0107] In some embodiments, when the actual driving mode of the vehicle is the direct drive mode, and the available flag of the direct drive mode indicates that the direct drive mode is not available, it is determined that the available flag of the series mode indicates that the series mode is available. When the vehicle is in the direct drive mode, and the direct drive mode is not available due to a fault or other reasons, the vehicle switches to the series mode.

[0108] In some embodiments, when the actual driving mode of the vehicle is the series mode, and the available flag of the direct drive mode indicates that the direct drive mode is not available, and the operating state of the engine is normal operation, it is determined that the available flag of the series mode indicates that the series mode is available. When the vehicle is in the series mode, the engine is running normally, but the direct drive mode is not available, the vehicle remains in the series mode.

[0109] In some embodiments, when the vehicle detects that the engine fails to start, the available flag of the pure electric mode of the vehicle is determined to indicate that the pure electric mode is available. The vehicle can determine whether the engine fails to start by detecting the shutdown type of the vehicle, and when the shutdown type is not equal to 0, it is determined that the engine fails to start. The shutdown type includes normal shutdown, fault shutdown, idle shutdown, and automatic shutdown.

[0110] In some embodiments, the vehicle can also switch from the series mode to the direct drive mode. Accordingly, when the actual driving mode of the vehicle is the series mode and the available flag of the direct drive mode indicates that the direct drive mode is available, the direct drive mode is determined to be an available driving mode.

[0111] S304: When the available flag of the pure electric mode indicates that the pure electric mode is not available, and the available flag of the series mode indicates that the series mode is not available, determine that the target driving mode of the vehicle is the direct driving mode.

[0112] When there are multiple available driving modes, the vehicle determines the available driving mode with the highest priority as the target driving mode according to the pre-set driving mode priority. The priority can be set as needed, and in the embodiment of the present application, the priority is not specifically limited. For example, it can be set that the priority of the pure electric mode is greater than the priority of the series mode, which is greater than the priority of the direct drive mode.

[0113] In the embodiment of the present application, the priority of the pure electric mode is higher than the priority of the series mode and higher than the priority of the direct drive mode. When the priority of the direct drive mode is the lowest, the vehicle determines the target drive mode as the direct drive mode only when both the current pure electric mode and the series mode are unavailable.

[0114] It should be noted that when there is an available driving mode with a higher priority than the direct drive mode, the vehicle will only consider the driving mode with a higher priority. Accordingly, when the available flag of the pure electric mode indicates that the pure electric mode is available, the target driving mode of the vehicle is determined to be the pure electric mode; or, when the available flag of the pure electric mode indicates that the pure electric mode is not available, and the available flag of the series mode indicates that the series mode is not available, the target driving mode of the vehicle is determined to be the direct drive mode.

[0115] See also Figure 4, which shows a logic diagram of selecting a target driving mode according to a priority provided by an exemplary embodiment. Different driving modes are represented by corresponding driving mode flags. When the flag of the pure electric mode indicates that the pure electric mode is available, the first signal value corresponding to the pure electric mode is output. When the flag of the pure electric mode indicates that the pure electric mode is not available, the flag of the series mode is determined. When the flag of the series mode indicates that the series mode is available, the corresponding second signal value is output. When the flag of the series mode indicates that the series mode is not available, the flag of the direct drive mode is determined. When the flag of the direct drive mode indicates that the direct drive mode is available, the corresponding third signal value is output. When the flag of the direct drive mode indicates that the direct drive mode is not available, an abnormal signal is output.

[0116] S305, the vehicle controls the engine to start based on the sliding friction starting method, so that the driving mode of the vehicle is switched from the pure electric mode to the direct drive mode.

[0117] The principle of this step is the same as that of step S204 and will not be repeated here.

[0118] In an embodiment of the present application, when receiving an engine start request, it is determined whether the direct drive mode and the sliding friction start mode are available, the start mode of the vehicle's current engine is determined according to whether the vehicle's sliding friction start mode is available, and the vehicle's final target drive mode is determined in combination with the engine start mode, so that the vehicle is driven according to the target drive mode. In this way, when both the sliding friction start mode and the direct drive mode are available, the engine can be started by the sliding friction start mode. Since the front axle motor is kept in a driving state during the process of starting the engine by the sliding friction mode, it is ensured that the front axle motor continuously outputs driving torque, so that the motor can drive without interruption and the engine can be started at the same time. Therefore, when switching from pure electric mode to direct drive mode, there is no need to switch from pure electric mode to series mode first, so that the vehicle can directly switch from pure electric mode to direct drive mode, which simplifies the process of switching the vehicle from pure electric mode to series mode and then from series mode to direct drive mode, and prevents the problem of insufficient power of the vehicle in series mode, thereby ensuring the power of the entire vehicle at the start time and optimizing the driving experience of the driver.

[0119] Furthermore, by setting the priorities of various drive modes, the adaptability of the vehicle's drive mode and driving parameters is comprehensively considered. For example, the priority of the pure electric mode is set to the highest, ensuring that the vehicle can meet the shutdown priority requirement, and the priority of the series mode is set higher than the direct drive mode, ensuring that the vehicle speed meets the direct drive mode. In this way, the most suitable drive mode is selected for the vehicle based on the priorities and available status of different drive modes, ensuring the normal operation of the vehicle. When both the direct drive mode and the sliding friction start mode are available, the vehicle can be directly switched to the direct drive mode through the sliding friction start mode, ensuring the power of the vehicle.

[0120] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0121] See also Figure 5 , which shows a schematic diagram of the structure of a vehicle driving mode switching device provided by the present application, and includes various units for executing various steps in the above embodiments, see Figure 5 , the driving mode switching device of the vehicle comprises:

[0122] A first determining unit 501 is used to determine an available flag position of a direct drive mode of the vehicle according to a driving parameter of the vehicle when the vehicle receives an engine start request in a pure electric mode;

[0123] A second determining unit 502 is used to determine an available flag position of the sliding friction start mode of the vehicle according to the driving parameter and the available flag position of the direct drive mode;

[0124] A third determining unit 503, configured to determine that the target driving mode of the vehicle is the direct driving mode when the available flag position of the sliding friction starting mode and the available flag position of the direct driving mode of the vehicle meet a preset condition;

[0125] The control unit 504 is used to control the engine to start based on the sliding friction starting method, so that the driving mode of the vehicle is switched from the pure electric mode to the direct drive mode.

[0126] In some embodiments, the third determination unit 503 is used to determine the available flags of the pure electric mode and the series mode according to the driving parameters of the vehicle when the available flag of the sliding start mode and the available flag of the direct drive mode of the vehicle meet preset conditions; when the available flag of the pure electric mode indicates that the pure electric mode is not available, and the available flag of the series mode indicates that the series mode is not available, determine that the target drive mode of the vehicle is the direct drive mode.

[0127] In some embodiments, the third determination module is used to determine that the target driving mode of the vehicle is the pure electric mode when the available flag of the pure electric mode indicates that the pure electric mode is available; or

[0128] The third determination module is used to determine that the target drive mode of the vehicle is the direct drive mode when the available flag bit of the pure electric mode indicates that the pure electric mode is not available and the available flag bit of the series mode indicates that the series mode is not available.

[0129] In some embodiments, the apparatus further comprises:

[0130] a fourth determining unit, for determining that the available flag bit of the series mode indicates that the series mode is available when the actual driving mode of the vehicle is the pure electric mode, the engine start mode is the quick start, and the available flag bit of the direct drive mode indicates that the direct drive mode is available; or,

[0131] The fourth determining unit is used to determine that the available flag bit of the series mode indicates that the series mode is available when the actual driving mode of the vehicle is the pure electric mode, the engine start-stop requirement is a start requirement, and the available flag bit of the direct drive mode indicates that the direct drive mode is not available; or,

[0132] The fourth determining unit is used to determine that the available flag bit of the series mode indicates that the series mode is available when the actual driving mode of the vehicle is the direct driving mode and the available flag bit of the direct driving mode indicates that the direct driving mode is not available; or,

[0133] The fourth determination unit is used to determine that the available flag of the series mode indicates that the series mode is available when the actual driving mode of the vehicle is the series mode, the available flag of the direct drive mode indicates that the direct drive mode is not available, and the operating state of the engine is normal operation.

[0134] In some embodiments, the driving parameters include engine speed, vehicle speed and gear information of the vehicle;

[0135] The first determination unit 501 is used to determine that the available flag of the direct drive mode indicates that the direct drive mode is available if the engine speed is within a preset speed range, the vehicle speed is within a first preset vehicle speed range, the gear information indicates that the vehicle is currently in a forward gear, and the difference between the engine speed and the engine speed limit value is less than a preset difference.

[0136] In some embodiments, the driving parameters include driving mode, vehicle speed, front axle gear information, drive mode and accelerator pedal opening;

[0137] The second determination unit 502 is used to determine if the driving mode is the four-wheel drive mode, and the vehicle speed is within the second preset vehicle speed, and the available flag of the direct drive mode indicates that the direct drive mode is available, and the front axle gear information indicates that the front axle gear is the target gear, and the driving mode of the vehicle is the pure electric four-wheel drive mode or the pure electric front-wheel drive mode; and the accelerator pedal opening is greater than the preset opening, and the available flag of the slippery start mode indicates that the slippery start mode is available.

[0138] In some embodiments, the apparatus further comprises:

[0139] The fifth determination unit is used to determine that the direct drive mode is an unavailable drive mode when the engine fails to start; and determine that the target drive mode of the vehicle is a pure electric mode.

[0140] In an embodiment of the present application, when receiving an engine start request, it is determined whether the direct drive mode and the sliding friction start mode are available, the start mode of the vehicle's current engine is determined according to whether the vehicle's sliding friction start mode is available, and the vehicle's final target drive mode is determined in combination with the engine start mode, so that the vehicle is driven according to the target drive mode. In this way, when both the sliding friction start mode and the direct drive mode are available, the engine can be started by the sliding friction start mode. Since the front axle motor is kept in a driving state during the process of starting the engine by the sliding friction mode, it is ensured that the front axle motor continuously outputs driving torque, so that the motor can drive without interruption and the engine can be started at the same time. Therefore, when switching from pure electric mode to direct drive mode, there is no need to switch from pure electric mode to series mode first, so that the vehicle can directly switch from pure electric mode to direct drive mode, which simplifies the process of switching the vehicle from pure electric mode to series mode and then from series mode to direct drive mode, and prevents the problem of insufficient power of the vehicle in series mode, thereby ensuring the power of the entire vehicle at the start time and optimizing the driving experience of the driver.

[0141] Figure 6 FIG. 1 is a schematic diagram of a vehicle provided by an exemplary embodiment of the present application. Figure 6 As shown, the vehicle 6 of this embodiment includes: a processor 60, a memory 61, and a computer program 62 stored in the memory 61 and executable on the processor 60, such as a vehicle driving mode switching program. When the processor 60 executes the computer program 62, the steps of the above-mentioned vehicle driving mode switching method embodiments are implemented, such as Figure 2 Alternatively, when the processor 60 executes the computer program 62, the functions of each unit in the above-mentioned device embodiments are realized, for example Figure 5 The functions of units 501 to 504 are shown.

[0142] Exemplarily, the computer program 62 may be divided into one or more units, which are stored in the memory 61 and executed by the processor 60 to complete the present application. The one or more units may be a series of computer program instruction segments capable of completing specific functions, and the instruction segments are used to describe the execution process of the computer program 62 in the vehicle 6. For example, the computer program 62 may be divided into a first determination unit, a second determination unit, a third determination unit, and a control unit, and the specific functions of each module are as follows:

[0143] A first determining unit 501 is used to determine an available flag position of a direct drive mode of the vehicle according to a driving parameter of the vehicle when the vehicle receives an engine start request in a pure electric mode;

[0144] A second determining unit 502 is used to determine an available flag position of the sliding friction start mode of the vehicle according to the driving parameter and the available flag position of the direct drive mode;

[0145] A third determining unit 503, configured to determine that the target driving mode of the vehicle is the direct driving mode when the available flag position of the sliding friction starting mode and the available flag position of the direct driving mode of the vehicle meet a preset condition;

[0146] The control unit 504 is used to control the engine to start based on the sliding friction starting method, so that the driving mode of the vehicle is switched from the pure electric mode to the direct drive mode.

[0147] The vehicle 6 may be any vehicle having a control function. The vehicle 6 may include, but is not limited to, a processor 60 and a memory 61. Those skilled in the art will appreciate that Figure 6 It is only an example of vehicle 6 and does not constitute a limitation of the vehicle 6. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the vehicle 6 may also include input and output devices, network access devices, buses, etc.

[0148] The processor 60 may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0149] The memory 61 may be an internal storage unit of the vehicle 6, such as a hard disk or memory of the vehicle 6. The memory 61 may also be an external storage device of the vehicle 6, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the vehicle 6. Further, the memory 61 may also include both an internal storage unit of the vehicle 6 and an external storage device. The memory 61 is used to store the computer program and other programs and data required by the terminal device. The memory 61 may also be used to temporarily store data that has been output or is to be output.

[0150] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0151] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0152] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0153] In the embodiments provided in the present application, it should be understood that the disclosed devices / terminal equipment and methods can be implemented in other ways. For example, the device / terminal equipment embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0154] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0155] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0156] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0157] The embodiments of the present application further provide a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0158] The embodiment of the present application also provides a computer program product. When the computer program product runs on a mobile terminal, the mobile terminal can implement the steps in the above-mentioned method embodiments when executing the computer program product.

[0159] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A method for switching a driving mode of a vehicle, characterized in that: The method comprises: When the vehicle receives an engine start request in the pure electric mode, determining an available flag position of the direct drive mode of the vehicle according to the driving parameters of the vehicle; Determining an available flag position of a sliding friction start mode of the vehicle according to the driving parameter and an available flag position of the direct drive mode; When the available flag position of the sliding friction start mode and the available flag position of the direct drive mode of the vehicle meet preset conditions, determining that the target drive mode of the vehicle is the direct drive mode; Based on the slippery start mode, the engine is controlled to start so that the driving mode of the vehicle is switched from a pure electric mode to a direct drive mode.

2. The method according to claim 1, characterized in that When the available flag position of the sliding friction start mode and the available flag position of the direct drive mode of the vehicle meet preset conditions, determining that the target drive mode of the vehicle is the direct drive mode includes: When the available flag position of the sliding friction start mode and the available flag position of the direct drive mode of the vehicle meet the preset conditions, determining the available flag positions of the pure electric mode and the series mode according to the driving parameters of the vehicle; When the available flag bit of the pure electric mode indicates that the pure electric mode is not available, and the available flag bit of the series mode indicates that the series mode is not available, it is determined that the target driving mode of the vehicle is the direct driving mode.

3. The method according to claim 2, characterized in that The method further comprises: When the available flag bit of the pure electric mode indicates that the pure electric mode is available, determining that the target driving mode of the vehicle is the pure electric mode; or, When the available flag bit of the pure electric mode indicates that the pure electric mode is not available, and the available flag bit of the series mode indicates that the series mode is not available, it is determined that the target driving mode of the vehicle is the direct driving mode.

4. The method according to claim 2 or 3, characterized in that The method further comprises: When the actual driving mode of the vehicle is the pure electric mode, the engine start mode is the quick start mode, and the available flag of the direct drive mode indicates that the direct drive mode is available, determining that the available flag of the series mode indicates that the series mode is available; or, When the actual driving mode of the vehicle is the pure electric mode, and the engine start-stop requirement is a start requirement, and the available flag of the direct drive mode indicates that the direct drive mode is not available, determining that the available flag of the series mode indicates that the series mode is available; or, When the actual driving mode of the vehicle is the direct driving mode, and the available flag of the direct driving mode indicates that the direct driving mode is not available, determining that the available flag of the series mode indicates that the series mode is available; or, When the actual driving mode of the vehicle is the series mode, and the available flag of the direct drive mode indicates that the direct drive mode is not available, and the operating state of the engine is normal operation, it is determined that the available flag of the series mode indicates that the series mode is available.

5. The method according to claim 1, characterized in that The driving parameters include engine speed, vehicle speed and gear information of the vehicle; The determining, according to the driving parameters of the vehicle, an available flag position of the direct drive mode of the vehicle comprises: If the engine speed is within a preset speed range, and the vehicle speed is within a first preset vehicle speed range, and the gear information indicates that the vehicle is currently in a forward gear, and the difference between the engine speed and the engine speed limit value is less than a preset difference, determining that the direct drive mode is available flag indicates that the direct drive mode is available.

6. The method according to claim 1, characterized in that The driving parameters include driving mode, vehicle speed, front axle gear information, drive mode and accelerator pedal opening; The step of determining the available flag position of the sliding friction start mode of the vehicle according to the driving parameter and the available flag position of the direct drive mode includes: If the driving mode is the four-wheel drive mode, and the vehicle speed is within the second preset vehicle speed, and the available flag of the direct drive mode indicates that the direct drive mode is available, and the front axle gear information indicates that the front axle gear is the target gear, and the driving mode of the vehicle is the pure electric four-wheel drive mode or the pure electric front-wheel drive mode; and the accelerator pedal opening is greater than the preset opening, it is determined that the available flag of the slippery start mode indicates that the slippery start mode is available.

7. The method according to claim 1, characterized in that The method further comprises: When the engine fails to start, determining the direct drive mode as an unavailable drive mode; Determine that the target driving mode of the vehicle is a pure electric mode.

8. A driving mode switching device for a vehicle, characterized in that: The device comprises: a first determining unit, configured to determine an available flag position of a direct drive mode of the vehicle according to a driving parameter of the vehicle when the vehicle receives an engine start request in a pure electric mode; A second determining unit, configured to determine an available flag position of a sliding friction start mode of the vehicle according to the driving parameter and an available flag position of the direct drive mode; a third determining unit, configured to determine that the target driving mode of the vehicle is the direct driving mode when an available flag position of the sliding friction starting mode and an available flag position of the direct driving mode of the vehicle meet a preset condition; A control unit is used to control the engine start-up based on the sliding friction starting method so that the driving mode of the vehicle is switched from a pure electric mode to a direct drive mode.

9. A vehicle, characterized in that: The vehicle includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor executes the computer program to implement the driving mode switching method of the vehicle according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the driving mode switching method of the vehicle according to any one of claims 1 to 7 is implemented.

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