Vehicle mode control method and system and vehicle

Abstract

The invention provides a vehicle mode control method and system and a vehicle, and belongs to the technical field of vehicles. According to the embodiment of the invention, the gearbox controller sends the second flag bit to the vehicle control unit, so that the vehicle control unit can comprehensively consider the first flag bit and the second flag bit to determine an appropriate low-speed direct-drive function flag bit, and then the low-speed direct-drive function of the vehicle is achieved through coordination between the gearbox controller and the vehicle control unit. Accurate control over the low-speed direct-drive mode is achieved, and the vehicle can be switched to the low-speed direct-drive mode at a proper time. On the other hand, by developing a low-speed direct-drive mode, the engine can drive the vehicle in a low-speed scene, the problem that the vehicle runs in winter and consumes too fast electricity is effectively solved, the electricity protection capacity of the vehicle is improved, the vehicle can be always kept in a four-wheel-drive state in a low-speed state, the phenomenon that the vehicle slips and drifts in snowy days is effectively avoided, and the service life of the vehicle is prolonged. And the driving safety of the vehicle is ensured.

Description

Technical Field

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

[0002] In order to adapt to different road conditions and driving requirements, new energy vehicles usually have multiple driving modes including series mode, pure electric four-wheel drive mode and direct drive mode.

[0003] In the related art, since the engine is prone to flameout when the vehicle is driving at low speed in direct drive mode, in order to ensure the safety of low-speed driving in snowy weather, new energy vehicles usually switch to pure electric four-wheel drive mode. However, since new energy vehicles consume energy faster in winter, when the high-voltage battery power is low, the vehicle will not be able to support four-wheel drive, and then switch to series mode to drive in two-wheel drive state. At this time, the vehicle is prone to slipping or tail swinging. Summary of the invention

[0004] The present application provides a vehicle mode control method, system and vehicle to solve the problem that the current vehicle driving mode cannot effectively meet the low-speed driving requirements of the vehicle on snowy days.

[0005] In order to solve the above problems, this application adopts the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a vehicle mode control method, which is applied to a vehicle controller, and the method includes:

[0007] Determining a first flag position based on first operating condition information of the vehicle;

[0008] receiving a second flag bit sent by a transmission controller; the second flag bit is determined by the transmission controller based on second operating condition information of the vehicle;

[0009] Based on the first flag bit and the second flag bit, determining a low-speed direct drive function flag bit; the low-speed direct drive function flag bit is used to indicate whether the vehicle is switched to a low-speed direct drive mode;

[0010] Wherein, in the low-speed direct drive mode, the clutch of the vehicle is in a slipping state and the engine is in a driving state.

[0011] In an embodiment of the present application, determining a low-speed direct drive function flag based on the first flag and the second flag includes:

[0012] When the first flag bit and the second flag bit are both in an activated state, setting the low-speed direct drive function flag bit to an activated state;

[0013] When the first flag bit is in an inactive state, or when the second flag bit is in an inactive state, the low-speed direct drive function flag bit is set to an inactive state;

[0014] Among them, when the low-speed direct drive function flag is in an activated state, it indicates that the vehicle switches to the low-speed direct drive mode; when the low-speed direct drive function flag is in an inactivated state, it indicates that the vehicle does not switch to the low-speed direct drive mode.

[0015] In one embodiment of the present application, the second operating condition information includes the current vehicle speed and the target driving mode;

[0016] The method further comprises:

[0017] The target drive mode is sent to the transmission controller, so that the transmission controller sets the second flag position to an activated state when it is determined that the target drive mode is the direct drive mode and the current vehicle speed is less than a vehicle speed threshold, or sets the second flag position to an inactivated state when it is determined that the target drive mode is not the direct drive mode or the current vehicle speed is greater than or equal to the vehicle speed threshold.

[0018] In one embodiment of the present application, the first operating condition information includes a target driving mode, vehicle environment information, and vehicle component information;

[0019] Determining a first flag position based on first operating condition information of the vehicle includes:

[0020] When the target driving mode is the direct driving mode, the vehicle environment information satisfies the environment enabling condition, and the vehicle component information satisfies the component enabling condition, setting the first flag to an activated state;

[0021] When the target driving mode is not the direct driving mode, or the vehicle environment information does not satisfy the environment enabling condition, or the vehicle component information does not satisfy the component enabling condition, the first flag is set to an inactive state.

[0022] In an embodiment of the present application, the method further includes:

[0023] When the target driving mode is the direct driving mode, the vehicle environment information satisfies the environment enabling conditions and the vehicle component information satisfies the component enabling conditions, the direct driving minimum enabling vehicle speed is reduced from the direct driving enabling value to the target value; the direct driving enabling value represents the minimum vehicle speed in the direct driving mode.

[0024] In one embodiment of the present application, the vehicle environment information includes current environment information or environment representation information; wherein the current environment information includes current environment temperature and current road conditions; the environment representation information includes current driving mode;

[0025] The method further comprises:

[0026] When the current ambient temperature is less than a temperature threshold and the current road condition is a slippery road condition, or when the current driving mode is a target driving mode, determining that the vehicle environment information satisfies the environment enabling condition;

[0027] When the current ambient temperature is greater than or equal to the temperature threshold or the current road condition is not the slippery road condition, and the current driving mode is not the target driving mode, it is determined that the vehicle environment information does not satisfy the environment enabling condition.

[0028] In one embodiment of the present application, the vehicle component information includes clutch slip status and engine information;

[0029] The method further comprises:

[0030] When the clutch slip state is in an available state and the engine information satisfies an engine driving condition, determining that the vehicle component information satisfies the component enabling condition;

[0031] When the clutch slip state is in an unavailable state, or the engine information does not satisfy an engine driving condition, it is determined that the vehicle component information does not satisfy the component enabling condition.

[0032] In one embodiment of the present application, the engine information includes engine status and current engine speed;

[0033] The method further comprises:

[0034] When the engine state is a running state and the current engine speed is greater than a speed threshold, determining that the engine information satisfies the engine driving condition;

[0035] When the engine state is not a running state, or the current engine speed is less than or equal to the speed threshold, it is determined that the engine information does not meet the engine driving condition.

[0036] In a second aspect, based on the same inventive concept, an embodiment of the present application provides another vehicle mode control method, which is applied to a transmission controller, and the method includes:

[0037] Determining a second flag position based on second operating condition information of the vehicle;

[0038] Sending the second flag bit to a vehicle controller, so that the vehicle controller determines a low-speed direct drive function flag bit based on the second flag bit and the first flag bit;

[0039] Among them, the first flag is determined by the vehicle controller based on the first operating condition information of the vehicle; the low-speed direct drive function flag is used to indicate whether the vehicle is switched to a low-speed direct drive mode; in the low-speed direct drive mode, the clutch of the vehicle is in a slipping state and the engine is in a driving state.

[0040] In a third aspect, based on the same inventive concept, an embodiment of the present application provides a vehicle mode control device, which is applied to a vehicle controller, and the device includes:

[0041] A first flag position determination module, used to determine a first flag position based on first operating condition information of the vehicle;

[0042] A second flag receiving module, used for receiving a second flag sent by a transmission controller; the second flag is determined by the transmission controller based on the second operating condition information of the vehicle;

[0043] A function flag determination module is used to determine a low-speed direct drive function flag based on the first flag and the second flag; the low-speed direct drive function flag is used to indicate whether the vehicle is switched to a low-speed direct drive mode; in the low-speed direct drive mode, the clutch of the vehicle is in a slipping state and the engine is in a driving state.

[0044] In an embodiment of the present application, the function flag bit determination module includes:

[0045] A first setting submodule, configured to set the low-speed direct drive function flag bit to an activated state when both the first flag bit and the second flag bit are in an activated state;

[0046] The second setting submodule is used to set the low-speed direct drive function flag to an inactive state when the first flag is in an inactive state or the second flag is in an inactive state; wherein, when the low-speed direct drive function flag is in an active state, it indicates that the vehicle switches to the low-speed direct drive mode; and when the low-speed direct drive function flag is in an inactive state, it indicates that the vehicle does not switch to the low-speed direct drive mode.

[0047] In one embodiment of the present application, the second operating condition information includes the current vehicle speed and the target driving mode;

[0048] The vehicle mode control device comprises:

[0049] A driving mode sending module is used to send the target driving mode to the transmission controller, so that the transmission controller sets the second flag position to an activated state when it is determined that the target driving mode is the direct driving mode and the current vehicle speed is less than a vehicle speed threshold, or sets the second flag position to an inactivated state when it is determined that the target driving mode is not the direct driving mode or the current vehicle speed is greater than or equal to the vehicle speed threshold.

[0050] In one embodiment of the present application, the first operating condition information includes a target driving mode, vehicle environment information, and vehicle component information;

[0051] The first flag bit determination module includes:

[0052] A third setting submodule, configured to set the first flag to an activated state when the target driving mode is a direct driving mode, the vehicle environment information satisfies an environment enabling condition, and the vehicle component information satisfies a component enabling condition;

[0053] The fourth setting submodule is used to set the first flag position to an inactive state when the target driving mode is not the direct driving mode, or the vehicle environment information does not meet the environment enabling condition, or the vehicle component information does not meet the component enabling condition.

[0054] In one embodiment of the present application, the vehicle mode control device further includes:

[0055] The enabling vehicle speed correction module is used to reduce the direct drive minimum enabling vehicle speed from a direct drive enabling value to a target value when the target driving mode is the direct drive mode, the vehicle environment information meets the environment enabling conditions, and the vehicle component information meets the component enabling conditions; the direct drive enabling value represents the minimum vehicle speed in the direct drive mode.

[0056] In one embodiment of the present application, the vehicle environment information includes current environment information or environment representation information; wherein the current environment information includes current environment temperature and current road conditions; the environment representation information includes current driving mode;

[0057] The vehicle mode control device further includes:

[0058] A first condition determination module, configured to determine that the vehicle environment information satisfies the environment enabling condition when the current ambient temperature is less than a temperature threshold and the current road condition is a slippery road condition, or when the current driving mode is a target driving mode;

[0059] The second condition determination module is used to determine that the vehicle environment information does not meet the environmental enabling condition when the current ambient temperature is greater than or equal to the temperature threshold or the current road condition is not the slippery road condition, and the current driving mode is not the target driving mode.

[0060] In one embodiment of the present application, the vehicle component information includes clutch slip state and engine information; the vehicle mode control device further includes:

[0061] A third condition determination module, configured to determine that the vehicle component information satisfies the component enabling condition when the clutch slip state is in an available state and the engine information satisfies the engine driving condition;

[0062] The fourth condition determination module is used to determine that the vehicle component information does not meet the component enabling condition when the clutch slip state is in an unavailable state or the engine information does not meet the engine driving condition.

[0063] In one embodiment of the present application, the engine information includes engine status and current engine speed;

[0064] The vehicle mode control device further includes:

[0065] a fifth condition determination module, configured to determine that the engine information satisfies the engine driving condition when the engine state is a running state and the current engine speed is greater than a speed threshold;

[0066] The sixth condition determination module is used to determine that the engine information does not meet the engine driving condition when the engine state is not in the running state or the current engine speed is less than or equal to the speed threshold.

[0067] In a fourth aspect, based on the same inventive concept, the embodiment of the present application provides another vehicle mode control device, which is applied to a transmission controller, and the device includes:

[0068] A second flag position determination module, used to determine a second flag position based on second operating condition information of the vehicle;

[0069] The second flag sending module is used to send the second flag to the vehicle controller so that the vehicle controller determines the low-speed direct drive function flag based on the second flag and the first flag; wherein the first flag is determined by the vehicle controller based on the first operating condition information of the vehicle; the low-speed direct drive function flag is used to indicate whether the vehicle is switched to a low-speed direct drive mode; in the low-speed direct drive mode, the clutch of the vehicle is in a slipping state and the engine is in a driving state.

[0070] In a fifth aspect, based on the same inventive concept, an embodiment of the present application provides a vehicle mode control system, the system comprising a vehicle controller and a transmission controller; wherein:

[0071] The transmission controller is used to determine a second flag bit based on second operating condition information of the vehicle, and send the second flag bit to the vehicle controller;

[0072] The vehicle controller is used to determine a first flag based on the first operating condition information of the vehicle, and to determine a low-speed direct drive function flag based on the first flag and the second flag; the low-speed direct drive function flag is used to indicate whether the vehicle is switched to a low-speed direct drive mode; wherein, in the low-speed direct drive mode, the clutch of the vehicle is in a slipping state and the engine is in a driving state.

[0073] In the sixth aspect, based on the same inventive concept, an embodiment of the present application provides a vehicle, including the vehicle mode control system proposed in the fifth aspect of the present application.

[0074] Compared with the prior art, this application has the following advantages:

[0075] A vehicle mode control method provided in an embodiment of the present application determines a first flag bit based on the first operating condition information of the vehicle by a vehicle controller, and receives a second flag bit sent by a transmission controller, wherein the second flag bit is determined by the transmission controller based on the second operating condition information of the vehicle, so that the vehicle controller can determine a low-speed direct drive function flag bit based on the first flag bit and the second flag bit; the low-speed direct drive function flag bit is used to indicate whether the vehicle is switched to a low-speed direct drive mode, in which the clutch of the vehicle is in a slipping state and the engine is in a driving state. The embodiment of the present application sends the second flag bit to the vehicle controller through the transmission controller, so that the vehicle controller can comprehensively consider the first flag bit and the second flag bit, determine the appropriate low-speed direct drive function flag bit, and then achieve precise control of the low-speed direct drive mode through the coordination between the transmission controller and the vehicle controller, so that the vehicle can switch to the low-speed direct drive mode at the appropriate time. Since in low-speed direct drive mode, the engine drives the vehicle through clutch slippage, it not only enables the engine to drive the vehicle in low-speed scenarios, effectively solving the problem of excessive power consumption in winter and improving the vehicle's power conservation capacity, but also enables the vehicle to always maintain a four-wheel drive state at low speeds, effectively preventing the vehicle from skidding and drifting in snowy weather, thereby ensuring the vehicle's driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0077] Figure 1 is a flowchart of a vehicle mode control method in one embodiment of the present application;

[0078] Figure 2 is a flowchart of another vehicle mode control method in one embodiment of the present application;

[0079] Figure 3 is a functional module diagram of a vehicle mode control device in one embodiment of the present application;

[0080] Figure 4 is a functional module diagram of another vehicle mode control device in one embodiment of the present application;

[0081] Figure 5 is a schematic diagram of the structure of a vehicle mode control system in one embodiment of the present application;

[0082] Figure 6 It is a structural schematic diagram of a vehicle in one embodiment of the present application. DETAILED DESCRIPTION

[0083] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0084] It should be noted that when the vehicle is driving in direct drive mode, the engine is in a driving state, the clutch is in a closed state, the rear axle motor is in a driving state, and the front axle motor is usually in a driving state. The power of the engine directly drives the vehicle through the clutch and the front axle transmission in turn. Since the engine and the front axle motor can jointly drive the front axle of the vehicle in direct drive mode, the driving force of the whole vehicle in direct drive mode is usually greater than the driving force of the whole vehicle in other drive modes. However, since the engine is directly connected to the wheel end in direct drive mode, the engine speed has a certain speed ratio with the vehicle speed. When the vehicle is driving at a low speed, it is easy for the engine speed to be too low and the flameout occurs.

[0085] Therefore, when the vehicle is driving at a low speed on snowy days, it usually switches to pure electric four-wheel drive mode. However, when using the car in winter, in addition to the normal driving energy consumption, new energy vehicles also have many energy consumptions such as passenger compartment heating, seat heating, defrosting and defogger. Therefore, the energy consumption required by new energy vehicles in winter is higher than that in other seasons. Since new energy vehicles consume energy faster in winter, when the high-voltage battery is low, the vehicle will not be able to support four-wheel drive driving and will switch to series mode. In series mode, the engine drives the front axle motor to generate electricity, and the generated electricity is used to charge the battery or provide it to the rear axle motor to drive the vehicle. Although the battery can be charged in series mode to prevent the battery power from further decreasing, it will cause the vehicle to drive in a two-wheel drive state. At this time, the vehicle is prone to slipping or tail swinging.

[0086] In response to the problem that the current vehicle driving mode cannot effectively meet the vehicle's low-speed driving needs on snowy days, the present application aims to provide a vehicle mode control method. On the one hand, the second flag is sent to the vehicle controller through the transmission controller, so that the vehicle controller can comprehensively consider the first flag and the second flag, and determine the appropriate low-speed direct drive function flag, and then through the coordination between the transmission controller and the vehicle controller, precise control of the low-speed direct drive mode is achieved, so that the vehicle can switch to the low-speed direct drive mode at the appropriate time; on the other hand, by developing the low-speed direct drive mode, not only can the engine be driven in low-speed scenarios, effectively solving the problem of excessive power consumption in winter driving, and improving the vehicle's power conservation ability, but the vehicle can also be able to always maintain a four-wheel drive state at low speeds, effectively avoiding the vehicle from slipping and drifting in snowy days, thereby ensuring the vehicle's driving safety.

[0087] Reference Figure 1 , shows a vehicle mode control method of the present application, which may include the following steps:

[0088] S101: Determine a first flag position based on first operating condition information of a vehicle.

[0089] It should be noted that the execution subject of this embodiment may be a computing service device with data processing, network communication and program running functions, or an electronic device with the above functions, such as a vehicle control unit (VCU for short).

[0090] In this embodiment, the first flag indicates the low-speed direct drive function available flag set by the VCU for the low-speed direct drive mode, which is used to reflect whether the vehicle can switch to the low-speed direct drive mode in the vehicle controller dimension.

[0091] In a specific implementation, if the VCU determines that the vehicle can switch to the low-speed direct drive mode based on the first operating condition information, the first flag position is set to an activated state; if it determines that the vehicle cannot switch to the low-speed direct drive mode, the first flag position is set to an inactivated state.

[0092] S102: Receive a second flag sent by a transmission controller.

[0093] It should be noted that the second flag represents the low-speed direct drive slip flag set by the transmission controller (Transmission Control Unit, TCU for short) for the low-speed direct drive mode, which is used to reflect whether the vehicle can switch to the low-speed direct drive mode in the transmission controller dimension.

[0094] In this embodiment, the second flag is determined by the TCU based on the second operating condition information of the vehicle.

[0095] In a specific implementation, if the TCU determines that the vehicle can switch to the low-speed direct drive mode based on the second operating condition information, the second flag is set to an activated state; if it determines that the vehicle cannot or does not need to switch to the low-speed direct drive mode, the second flag is set to an inactivated state.

[0096] S103: Determine the low-speed direct drive function flag based on the first flag and the second flag.

[0097] In this implementation, after receiving the second flag bit sent by the TCU, the VCU can comprehensively consider the first flag bit and the second flag bit to determine the appropriate low-speed direct drive function flag bit.

[0098] In a specific implementation, when both the first flag bit and the second flag bit are in an activated state, the low-speed direct drive function flag bit can be set to an activated state; when the first flag bit is in an inactive state, or the second flag bit is in an inactive state, the low-speed direct drive function flag bit can be set to an inactive state. In other words, the low-speed direct drive function flag bit can only be set to an activated state when both the vehicle controller dimension and the transmission controller dimension reflect that the vehicle can switch to the low-speed direct drive mode.

[0099] It should be noted that the low-speed direct drive function flag is a function flag set for the low-speed direct drive mode in the vehicle dimension, which is used to indicate whether the vehicle is switched to the low-speed direct drive mode.

[0100] Specifically, if the low-speed direct drive function flag is in an activated state, it indicates that the vehicle switches to the low-speed direct drive mode; if the low-speed direct drive function flag is in an inactivated state, it indicates that the vehicle does not switch to the low-speed direct drive mode.

[0101] In this embodiment, by clarifying the interaction logic and control logic between the VCU and the TCU, the VCU can comprehensively consider the first flag and the second flag to achieve precise control of the low-speed direct drive function flag, and then control the vehicle to switch to the low-speed direct drive mode at the appropriate time.

[0102] In this embodiment, in the low-speed direct drive mode, the clutch of the vehicle is in a slipping state, and the engine is in a driving state.

[0103] It should be noted that the slipping state is an intermediate state between the closed state and the open state. When the clutch is in the slipping state, the clutch is not fully engaged and there is relative sliding at both ends of the clutch. In this state, the friction material of the clutch is rotating but the engine torque is not fully transmitted.

[0104] In this embodiment, since the clutch is in a slipping state, the engine and the wheel end are not in a hard connection state. At this time, the engine can not only transmit the engine torque to the wheel end through the clutch and the front axle gearbox, but also run at a higher speed when the vehicle is running at a low speed, thereby effectively avoiding the phenomenon of the engine being stalled due to too low speed. At the same time, using the engine to drive the vehicle through the slipping of the clutch can effectively reduce the power consumption of the high-voltage battery.

[0105] In this embodiment, on the one hand, the second flag is sent to the VCU through the TCU, so that the VCU can comprehensively consider the first flag and the second flag, determine the appropriate low-speed direct drive function flag, and then achieve precise control of the low-speed direct drive mode through coordination between the TCU and the VCU, so that the vehicle can switch to the low-speed direct drive mode at the appropriate time; on the other hand, by developing the low-speed direct drive mode, not only can the engine drive the vehicle in low-speed scenarios, effectively solving the problem of excessive power consumption in winter and improving the vehicle's power conservation ability, but the vehicle can also be able to always maintain a four-wheel drive state at low speeds, effectively avoiding the vehicle from skidding and drifting in snowy weather, thereby ensuring the vehicle's driving safety.

[0106] In a feasible implementation manner, the second operating condition information includes the current vehicle speed and the target driving mode; the vehicle mode control method further includes the following steps:

[0107] S104: Send the target drive mode to the TCU, so that the TCU sets the second flag to an activated state when it is determined that the target drive mode is the direct drive mode and the current vehicle speed is less than the vehicle speed threshold, or sets the second flag to an inactivated state when it is determined that the target drive mode is not the direct drive mode or the current vehicle speed is greater than or equal to the vehicle speed threshold.

[0108] In this embodiment, the VCU can automatically switch to a suitable target driving mode according to the vehicle information. Specifically, the VCU can determine whether the target driving mode is a direct drive mode according to the vehicle's operating condition information and the driver's operation information.

[0109] In this embodiment, the operating condition information may specifically include the current SOC (State of Charge) of the high-voltage battery. The VCU can effectively determine whether the high-voltage battery has sufficient remaining power to support the vehicle to operate in direct drive mode by detecting the current remaining power of the high-voltage battery. At the same time, by detecting the driver's operation information, it can effectively determine whether the driver has a strong power demand.

[0110] In a specific implementation, the driver operation information may specifically include the current throttle opening and the current throttle opening change rate of the accelerator pedal. The VCU may determine that the driver has a strong power demand when it detects that the current throttle opening is greater than the opening threshold and the current throttle opening change rate is greater than the change rate threshold.

[0111] In this embodiment, by comprehensively considering the current throttle opening change rate based on the current throttle opening, the driver's strong power demand can be more accurately identified, thereby improving the accuracy of driver intention identification.

[0112] In this embodiment, if the VCU detects that the driver has a strong power demand and the current remaining power is greater than the power threshold, the target drive mode will be determined to be the direct drive mode to meet the driver's power demand.

[0113] In this embodiment, after determining the target drive mode, the VCU will send the target drive mode to the TCU. If the TCU detects that the target drive mode is the direct drive mode and the current vehicle speed is less than the vehicle speed threshold, it will determine that the current vehicle speed is too low and the vehicle cannot run smoothly in the traditional direct drive mode. At this time, the second flag will be set to an activated state, and the second flag will be fed back to the VCU to inform the VCU that the vehicle needs to switch to the low-speed direct drive mode.

[0114] In this embodiment, the vehicle speed threshold may be set to be less than or equal to the direct drive enable value. The direct drive enable value indicates the minimum vehicle speed at which the vehicle can enter the direct drive mode. That is, in the direct drive mode, the vehicle speed can only be reduced to the direct drive enable value at the lowest. If the vehicle speed is less than the direct drive enable value, there is a risk of killing the engine.

[0115] In this embodiment, if the TCU detects that the target drive mode is not the direct drive mode or the current vehicle speed is greater than or equal to the vehicle speed threshold, it means that the vehicle does not need to switch to the direct drive mode, or the current vehicle speed is high and the vehicle can run smoothly in the direct drive mode. At this time, the second flag is set to an inactive state and the second flag is fed back to the VCU to inform the VCU that the vehicle does not need to switch to the low-speed direct drive mode.

[0116] It should be noted that, when the vehicle is traveling in the low-speed direct drive mode, if the VCU receives that the second flag position is in an inactive state, the vehicle will be controlled to exit the low-speed direct drive mode.

[0117] In this embodiment, by comprehensively considering the target driving mode and the current vehicle speed, the TCU can achieve precise control of the second flag position, so that the vehicle can enter or exit the low-speed direct drive mode at an appropriate time.

[0118] In a feasible implementation manner, the first operating condition information includes the target driving mode, vehicle environment information and vehicle component information; S101 may specifically include the following sub-steps:

[0119] S101 - 1 : When the target driving mode is the direct driving mode, the vehicle environment information satisfies the environment enabling condition, and the vehicle component information satisfies the component enabling condition, the first flag is set to an activated state.

[0120] In this embodiment, after determining that the target drive mode is the direct drive mode, the VCU will comprehensively consider the vehicle environment information and vehicle component information to accurately determine whether the vehicle needs to be switched to the low-speed direct drive mode.

[0121] It should be noted that the environmental enabling conditions are used to determine whether the vehicle needs to switch to the low-speed direct drive mode in the vehicle environment dimension to adapt to the current vehicle environment; the component enabling conditions are used to determine whether the vehicle components can support the vehicle to operate in the low-speed direct drive mode in the vehicle component dimension.

[0122] In the specific implementation, the VCU will determine whether the vehicle is in a state of high energy consumption and strong four-wheel drive demand based on the vehicle environment information. If the VCU determines that the vehicle is in a state of high energy consumption and strong four-wheel drive demand based on the vehicle status information, it determines that the vehicle status information meets the environmental enabling conditions. Among them, high energy consumption means that the power demand of the whole vehicle is greater than the power threshold.

[0123] In a specific implementation, the vehicle component information may include clutch information and engine information. If the VCU detects that the clutch information and engine information meet the component enabling conditions, it means that the engine and clutch are in good operating condition, and the engine can drive the vehicle through clutch friction, thereby determining that the vehicle component information meets the component enabling conditions.

[0124] In this embodiment, if the VCU simultaneously detects that the target drive mode is the direct drive mode, the vehicle environment information satisfies the environment enabling conditions, and the vehicle component information satisfies the component enabling conditions, while setting the first flag position to the activated state, it will also reduce the direct drive minimum enabling speed from the direct drive enabling value to the target value; the direct drive enabling value represents the minimum speed of the vehicle in the direct drive mode.

[0125] Exemplarily, the direct drive enable value is 25km / h. After the VCU detects that the target drive mode is the direct drive mode, the vehicle environment information meets the environment enable conditions, and the vehicle component information meets the component enable conditions, it will reduce the direct drive minimum enabling speed from 25km / h to 15km / h.

[0126] It should be noted that the target value can be determined based on the clutch and engine performance. Specifically, the smaller the minimum engine speed at which the engine can run stably, the stronger the slip performance of the clutch, and the engine can drive the vehicle through clutch slip at a lower speed. At this time, a smaller target value can be set, for example, the minimum can be set to 0km / h.

[0127] In this embodiment, by reducing the minimum direct drive enabling speed from the direct drive enabling value to the target value, the logic conflict between the low-speed direct drive mode and the vehicle's existing direct drive mode can be effectively avoided, so that the vehicle can run smoothly in the low-speed direct drive mode. After the vehicle exits the low-speed direct drive mode, the HCU will restore the effective speed to the direct drive enabling value to ensure the normal operation of the vehicle in the direct drive mode.

[0128] S101 - 2 : When the target driving mode is not the direct driving mode, or the vehicle environment information does not satisfy the environment enabling condition, or the vehicle component information does not satisfy the component enabling condition, the first flag is set to an inactive state.

[0129] In this embodiment, if the VCU detects that the target drive mode is not the direct drive mode, or the vehicle environment information does not meet the environment enabling conditions, or the vehicle component information does not meet the component enabling conditions, it means that the vehicle does not need to run in the low-speed direct drive mode or cannot run smoothly in the low-speed direct drive mode. At this time, the first flag position will be set to an inactive state to prevent the vehicle from mistakenly switching to the low-speed direct drive mode.

[0130] It should be noted that, when the vehicle is traveling in the low-speed direct drive mode, if it is detected that the first flag position is in an inactive state, the vehicle will be controlled to exit the low-speed direct drive mode.

[0131] In this embodiment, by comprehensively considering the target driving mode, vehicle environment information and vehicle component information, accurate control of the first flag position can be achieved, so that the vehicle can enter or exit the low-speed direct drive mode at an appropriate time.

[0132] In a feasible implementation manner, in order to accurately determine the environmental enabling conditions, the vehicle mode control method may specifically include the following steps:

[0133] S105: When the current ambient temperature is less than the temperature threshold and the current road condition is a slippery road condition, or when the current driving mode is the target driving mode, determine whether the vehicle environment information satisfies the environment enabling condition.

[0134] In this embodiment, the environmental enabling condition is used to determine whether the vehicle is in a state of high energy consumption and strong four-wheel drive demand. If the VCU determines that the vehicle is in a state of high energy consumption and strong four-wheel drive demand based on the vehicle state information, it determines that the vehicle environment information meets the environmental enabling condition.

[0135] In a specific implementation, the vehicle environment information may specifically include current environment information, including current environment temperature and current road conditions. It should be noted that when the current environment temperature is less than the temperature threshold, the user will usually enable the heating system, thereby causing the vehicle to enter a high energy consumption state; when the current road condition is a slippery road condition, the vehicle needs to be in a four-wheel drive state to avoid the vehicle from slipping and improve the vehicle's driving performance.

[0136] In this embodiment, it is possible to determine whether the current road condition is a slippery road condition based on the weather type and / or the road surface image. Specifically, the VCU can determine that the current road condition is a slippery road condition when it detects that the weather type is a rainy type, a snowy type, or a hail type; and / or, input the road surface image into a preset road condition recognition model, and output a road condition recognition result, which is used to indicate whether the vehicle is in a slippery road condition.

[0137] In a specific implementation, the vehicle environment information may also include environment characterization information, which may include the current driving mode. If the VCU detects that the current driving mode is the target driving mode, it may directly determine that the vehicle environment information meets the environment enabling condition. In the target driving mode, the vehicle will be in a state of high energy consumption and strong four-wheel drive demand.

[0138] For example, the target driving mode may include a snow driving mode. Since when the vehicle is in the snow driving mode, there is a strong demand for four-wheel drive and the heating system needs to be enabled, the VCU can quickly determine whether the vehicle environment information meets the environment enabling condition by detecting whether the vehicle is in the snow driving mode, without having to determine the current environment information.

[0139] In this embodiment, the user can manually control the vehicle to enter the target driving mode, for example, by triggering a mode switching command through a preset physical button, a virtual button, or by voice. At this time, the VCU will switch the vehicle to the target driving mode in response to the mode switching command triggered by the user. The VCU can also automatically switch to the target driving mode when it detects that the vehicle meets the switching conditions for switching to the target driving mode. Specifically, the VCU can determine that the vehicle meets the switching conditions for switching to the target driving mode when it detects that the current ambient temperature is less than the temperature threshold and the current road condition is a slippery road condition.

[0140] S106: When the current ambient temperature is greater than or equal to the temperature threshold or the current road condition is not a slippery road condition, and the current driving mode is not the target driving mode, determine that the vehicle environment information does not meet the environment enabling condition.

[0141] In this embodiment, if the VCU detects that the current driving mode is not the target driving mode, and at the same time, the current ambient temperature is greater than or equal to the temperature threshold or the current road condition is not a slippery road condition, it means that the vehicle is either not in a high energy consumption state or there is no strong four-wheel drive demand, and then determines that the vehicle environmental information does not meet the environmental enabling conditions, and then sets the first flag position to an inactive state.

[0142] In a feasible implementation manner, in order to accurately determine the component enabling condition, the vehicle mode control method may specifically include the following steps:

[0143] S107: When the clutch slip state is in an available state and the engine information satisfies the engine driving condition, determining that the vehicle component information satisfies the component enabling condition.

[0144] It should be noted that the clutch slip state includes two states: an available state and an unavailable state. Among them, when the clutch slip state is an available state, it means that the clutch is capable of slip drive; when the clutch slip state is an unavailable state, it means that the clutch is not capable of slip drive.

[0145] In this embodiment, the TCU may determine the clutch slipping state based on the clutch state information, and send the clutch slipping state to the VCU.

[0146] In a specific implementation, the clutch status information includes an overheating signal and a hardware fault signal. If the TCU detects that the overheating signal indicates that the clutch is not overheated and the hardware fault signal indicates that the clutch has no hardware fault, the clutch slip state is determined to be an available state; if the TCU detects that the overheating signal indicates that the clutch is overheated and the hardware fault signal indicates that the clutch has a hardware fault, the clutch slip state is determined to be an unavailable state.

[0147] In this embodiment, the TCU sends the clutch slip state to the VCU, so that the VCU can combine the clutch slip state with the engine information to achieve accurate judgment of the component enabling condition.

[0148] In a specific implementation, the engine information includes the engine state and the current engine speed; the VCU can determine that the engine information meets the engine driving condition when the engine state is in the running state and the current engine speed is greater than the speed threshold; and determine that the engine information does not meet the engine driving condition when the engine state is not in the running state or the current engine speed is less than or equal to the speed threshold. The speed threshold can be set to be greater than or equal to the idle speed of the engine.

[0149] It should be noted that when the engine is in the off state, the engine may still have an engine speed due to inertia. Therefore, by comprehensively considering the engine state and the current engine speed, it can ensure that the engine is in a state where it can output torque stably, avoiding the phenomenon of the engine being unable to output torque or stalling during the mode switching process.

[0150] In this embodiment, the VCU comprehensively considers the clutch slip state and engine information to ensure that the engine can effectively transmit torque to the wheel end through the clutch after the vehicle switches to the low-speed direct drive mode, thereby ensuring the safe use of the engine and clutch and the driving safety of the vehicle.

[0151] S108: When the clutch slip state is in an unavailable state, or the engine information does not satisfy the engine driving condition, determine that the vehicle component information does not satisfy the component enabling condition.

[0152] In this embodiment, if the VCU detects that the clutch slip state is unavailable, it means that the clutch cannot be driven by slip; if it detects that the engine information does not meet the engine driving conditions, it means that the engine is not ready to drive. At this time, the VCU will determine that the vehicle component information does not meet the component enabling conditions, and then set the first flag position to an inactive state.

[0153] In this embodiment, by adding a first flag bit to the VCU and a second flag bit to the TCU, the low-speed direct drive mode can be precisely controlled under the coordination between the VCU and the TCU, thereby controlling the vehicle to enter or exit the low-speed direct drive mode at the appropriate time. At the same time, the TCU sends the clutch slip state and the second flag bit to the VCU to complete the handshake action, thereby avoiding problems such as clutch overheating or engine speed surge, and ensuring that the vehicle can operate safely and stably in the low-speed direct drive mode.

[0154] In the second aspect, based on the same inventive concept, refer to Figure 2 , the embodiment of the present application provides another vehicle mode control method, which is applied to a transmission controller, and the method specifically includes the following steps:

[0155] S201: Determine a second flag position based on second operating condition information of the vehicle.

[0156] In this implementation, the second operating condition information includes the current vehicle speed and the target driving mode.

[0157] In a specific implementation, when the TCU determines that the target drive mode is the direct drive mode and the current vehicle speed is less than the vehicle speed threshold, the second flag is set to an activated state; or, when the TCU determines that the target drive mode is not the direct drive mode or the current vehicle speed is greater than or equal to the vehicle speed threshold, the second flag is set to an inactivated state.

[0158] S202: Send the second flag to the vehicle controller, so that the vehicle controller determines the low-speed direct drive function flag based on the second flag and the first flag.

[0159] In this embodiment, the first flag is determined by the vehicle controller based on the first operating condition information of the vehicle, and the low-speed direct drive function flag is used to indicate whether the vehicle is switched to the low-speed direct drive mode; in the low-speed direct drive mode, the vehicle's clutch is in a slipping state and the engine is in a driving state.

[0160] In this embodiment, the second flag is sent to the VCU through the TCU, so that the VCU can comprehensively consider the first flag and the second flag, determine the appropriate low-speed direct drive function flag, and then achieve precise control of the low-speed direct drive mode through coordination between the TCU and the VCU, so that the vehicle can switch to the low-speed direct drive mode at the appropriate time; on the other hand, by developing the low-speed direct drive mode, not only can the engine drive the vehicle in low-speed scenarios, effectively solving the problem of excessive power consumption in winter, and improving the vehicle's power conservation ability, but the vehicle can also be able to always maintain a four-wheel drive state at low speeds, effectively avoiding the vehicle from skidding and drifting in snowy weather, thereby ensuring the vehicle's driving safety.

[0161] In the third aspect, based on the same inventive concept, refer to Figure 3 The embodiment of the present application provides a vehicle mode control device 300, which is applied to a vehicle controller, and the device includes:

[0162] A first flag position determining module 301 is used to determine a first flag position based on first operating condition information of the vehicle;

[0163] A second flag receiving module 302 is used to receive a second flag sent by a transmission controller; the second flag is determined by the transmission controller based on the second operating condition information of the vehicle;

[0164] The function flag determination module 303 is used to determine the low-speed direct drive function flag based on the first flag and the second flag; the low-speed direct drive function flag is used to indicate whether the vehicle is switched to the low-speed direct drive mode; in the low-speed direct drive mode, the vehicle's clutch is in a slipping state and the engine is in a driving state.

[0165] In one embodiment of the present application, the function flag determination module 303 includes:

[0166] A first setting submodule is used to set the low-speed direct drive function flag bit to an activated state when the first flag bit and the second flag bit are both in an activated state;

[0167] The second setting submodule is used to set the low-speed direct drive function flag to an inactive state when the first flag is in an inactive state or the second flag is in an inactive state; wherein, when the low-speed direct drive function flag is in an active state, it indicates that the vehicle switches to a low-speed direct drive mode; and when the low-speed direct drive function flag is in an inactive state, it indicates that the vehicle does not switch to a low-speed direct drive mode.

[0168] In one embodiment of the present application, the second operating condition information includes the current vehicle speed and the target driving mode;

[0169] The vehicle mode control device 300 includes:

[0170] The driving mode sending module is used to send the target driving mode to the transmission controller, so that the transmission controller sets the second flag position to an activated state when it is determined that the target driving mode is a direct driving mode and the current vehicle speed is less than a vehicle speed threshold, or sets the second flag position to an inactivated state when it is determined that the target driving mode is not a direct driving mode or the current vehicle speed is greater than or equal to the vehicle speed threshold.

[0171] In one embodiment of the present application, the first operating condition information includes a target driving mode, vehicle environment information, and vehicle component information;

[0172] The first flag bit determination module 301 includes:

[0173] A third setting submodule is used to set the first flag to an activated state when the target driving mode is the direct driving mode, the vehicle environment information meets the environment enabling condition, and the vehicle component information meets the component enabling condition;

[0174] The fourth setting submodule is used to set the first flag to an inactive state when the target driving mode is not the direct driving mode, or the vehicle environment information does not meet the environment enabling condition, or the vehicle component information does not meet the component enabling condition.

[0175] In one embodiment of the present application, the vehicle mode control device 300 further includes:

[0176] The enabling vehicle speed correction module is used to reduce the direct drive minimum enabling vehicle speed from the direct drive enabling value to the target value when the target driving mode is the direct drive mode, the vehicle environment information meets the environment enabling conditions and the vehicle component information meets the component enabling conditions; the direct drive enabling value represents the minimum vehicle speed in the direct drive mode.

[0177] In one embodiment of the present application, the vehicle environment information includes current environment information or environment representation information; wherein the current environment information includes the current environment temperature and the current road condition; the environment representation information includes the current driving mode;

[0178] The vehicle mode control device 300 further includes:

[0179] A first condition determination module, configured to determine that the vehicle environment information satisfies the environment enabling condition when the current ambient temperature is less than a temperature threshold and the current road condition is a slippery road condition, or when the current driving mode is a target driving mode;

[0180] The second condition determination module is used to determine that the vehicle environment information does not meet the environment enabling condition when the current ambient temperature is greater than or equal to the temperature threshold or the current road condition is not a slippery road condition, and the current driving mode is not a target driving mode.

[0181] In one embodiment of the present application, the vehicle component information includes clutch slip state and engine information; the vehicle mode control device 300 also includes:

[0182] A third condition determination module, configured to determine that the vehicle component information satisfies the component enabling condition when the clutch slip state is in an available state and the engine information satisfies the engine driving condition;

[0183] The fourth condition determination module is used to determine that the vehicle component information does not meet the component enabling condition when the clutch slip state is in an unavailable state or the engine information does not meet the engine driving condition.

[0184] In one embodiment of the present application, the engine information includes the engine status and the current engine speed;

[0185] The vehicle mode control device 300 further includes:

[0186] a fifth condition determination module, configured to determine that the engine information satisfies the engine driving condition when the engine state is in the running state and the current engine speed is greater than the speed threshold;

[0187] The sixth condition determination module is used to determine that the engine information does not meet the engine driving condition when the engine state is not in the running state or the current engine speed is less than or equal to the speed threshold.

[0188] It should be noted that the specific implementation of the vehicle mode control device 300 of the embodiment of the present application refers to the specific implementation of the vehicle mode control method proposed in the first aspect of the embodiment of the present application, which will not be repeated here.

[0189] In the fourth aspect, based on the same inventive concept, refer to Figure 4 , the embodiment of the present application provides another vehicle mode control device 400, which is applied to a transmission controller, and the device includes:

[0190] A second flag position determination module 401, configured to determine a second flag position based on second operating condition information of the vehicle;

[0191] The second flag sending module 402 is used to send the second flag to the vehicle controller so that the vehicle controller determines the low-speed direct drive function flag based on the second flag and the first flag; wherein the first flag is determined by the vehicle controller based on the first operating condition information of the vehicle; the low-speed direct drive function flag is used to indicate whether the vehicle is switched to the low-speed direct drive mode; in the low-speed direct drive mode, the clutch of the vehicle is in a slipping state and the engine is in a driving state.

[0192] It should be noted that the specific implementation of the vehicle mode control device 400 of the embodiment of the present application refers to the specific implementation of another vehicle mode control method proposed in the second aspect of the embodiment of the present application, and will not be repeated here.

[0193] In the fifth aspect, based on the same inventive concept, refer to Figure 5 The embodiment of the present application provides a vehicle mode control system 500, the system includes a vehicle controller 501 and a transmission controller 502; wherein,

[0194] The gearbox controller 502 is used to determine a second flag bit based on the second operating condition information of the vehicle, and send the second flag bit to the vehicle controller 501;

[0195] The vehicle controller 501 is used to determine a first flag based on the first operating condition information of the vehicle, and to determine a low-speed direct drive function flag based on the first flag and the second flag; the low-speed direct drive function flag is used to indicate whether the vehicle is switched to a low-speed direct drive mode; wherein, in the low-speed direct drive mode, the clutch of the vehicle is in a slipping state and the engine is in a driving state.

[0196] It should be noted that the specific implementation of the vehicle mode control system 500 of the embodiment of the present application refers to the specific implementation of a vehicle mode control method proposed in the first aspect of the embodiment of the present application and the specific implementation of another vehicle mode control method proposed in the second aspect of the embodiment of the present application, which will not be repeated here.

[0197] In the sixth aspect, based on the same inventive concept, refer to Figure 6 An embodiment of the present application provides a vehicle 600, including the vehicle mode control system 500 proposed in the fifth aspect of the present application.

[0198] It should be noted that the specific implementation of the vehicle 600 in the embodiment of the present application refers to the specific implementation of the vehicle mode control system 500 proposed in the fifth aspect of the embodiment of the present application, which will not be repeated here.

[0199] It should be understood by those skilled in the art that the embodiments of the present invention may be provided as methods, devices, or computer program products. Therefore, the embodiments of the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the embodiments of the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0200] The embodiments of the present invention are described with reference to the flowcharts and / or block diagrams of the methods, terminal devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0201] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0202] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device so that a series of operating steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, thereby providing instructions for executing on the computer or other programmable terminal device to implement the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0203] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0204] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0205] The vehicle mode control method, system and vehicle provided by the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A vehicle mode control method, characterized in that: Applied to a vehicle controller, the method comprises: Determining a first flag position based on first operating condition information of the vehicle; Receiving a second flag bit sent by a transmission controller; the second flag bit is determined by the transmission controller based on second operating condition information of the vehicle; Based on the first flag bit and the second flag bit, determining a low-speed direct drive function flag bit; the low-speed direct drive function flag bit is used to indicate whether the vehicle is switched to a low-speed direct drive mode; Wherein, in the low-speed direct drive mode, the clutch of the vehicle is in a slipping state and the engine is in a driving state.

2. The vehicle mode control method according to claim 1, characterized in that: Determining a low-speed direct drive function flag based on the first flag and the second flag includes: When the first flag bit and the second flag bit are both in an activated state, setting the low-speed direct drive function flag bit to an activated state; When the first flag bit is in an inactive state, or when the second flag bit is in an inactive state, the low-speed direct drive function flag bit is set to an inactive state; Among them, when the low-speed direct drive function flag is in an activated state, it indicates that the vehicle switches to the low-speed direct drive mode; when the low-speed direct drive function flag is in an inactivated state, it indicates that the vehicle does not switch to the low-speed direct drive mode.

3. The vehicle mode control method according to claim 2, characterized in that: The second operating condition information includes the current vehicle speed and the target driving mode; The method further comprises: The target drive mode is sent to the transmission controller, so that the transmission controller sets the second flag position to an activated state when it is determined that the target drive mode is the direct drive mode and the current vehicle speed is less than a vehicle speed threshold, or sets the second flag position to an inactivated state when it is determined that the target drive mode is not the direct drive mode or the current vehicle speed is greater than or equal to the vehicle speed threshold.

4. The vehicle mode control method according to claim 2, characterized in that: The first operating condition information includes a target driving mode, vehicle environment information, and vehicle component information; Determining a first flag position based on first operating condition information of the vehicle includes: When the target driving mode is the direct driving mode, the vehicle environment information satisfies the environment enabling condition, and the vehicle component information satisfies the component enabling condition, setting the first flag to an activated state; When the target driving mode is not the direct driving mode, or the vehicle environment information does not satisfy the environment enabling condition, or the vehicle component information does not satisfy the component enabling condition, the first flag is set to an inactive state.

5. The vehicle mode control method according to claim 4, characterized in that: The method further comprises: When the target driving mode is the direct driving mode, the vehicle environment information satisfies the environment enabling conditions and the vehicle component information satisfies the component enabling conditions, the direct driving minimum enabling vehicle speed is reduced from the direct driving enabling value to the target value; the direct driving enabling value represents the minimum vehicle speed in the direct driving mode.

6. The vehicle mode control method according to claim 4, characterized in that: The vehicle environment information includes current environment information or environment representation information; wherein the current environment information includes current environment temperature and current road conditions; the environment representation information includes current driving mode; The method further comprises: When the current ambient temperature is less than a temperature threshold and the current road condition is a slippery road condition, or when the current driving mode is a target driving mode, determining that the vehicle environment information satisfies the environment enabling condition; When the current ambient temperature is greater than or equal to the temperature threshold or the current road condition is not the slippery road condition, and the current driving mode is not the target driving mode, it is determined that the vehicle environment information does not satisfy the environment enabling condition.

7. The vehicle mode control method according to claim 4, characterized in that: The vehicle component information includes clutch slip status and engine information; The method further comprises: When the clutch slip state is in an available state and the engine information satisfies an engine driving condition, determining that the vehicle component information satisfies the component enabling condition; When the clutch slip state is in an unavailable state, or the engine information does not satisfy an engine driving condition, it is determined that the vehicle component information does not satisfy the component enabling condition.

8. The vehicle mode control method according to claim 7, characterized in that: The engine information includes engine status and current engine speed; The method further comprises: When the engine state is a running state and the current engine speed is greater than a speed threshold, determining that the engine information satisfies the engine driving condition; When the engine state is not a running state, or the current engine speed is less than or equal to the speed threshold, it is determined that the engine information does not meet the engine driving condition.

9. A vehicle mode control method, characterized in that: Applied to a transmission controller, the method comprises: Determining a second flag position based on second operating condition information of the vehicle; Sending the second flag bit to a vehicle controller, so that the vehicle controller determines a low-speed direct drive function flag bit based on the second flag bit and the first flag bit; Among them, the first flag is determined by the vehicle controller based on the first operating condition information of the vehicle; the low-speed direct drive function flag is used to indicate whether the vehicle is switched to a low-speed direct drive mode; in the low-speed direct drive mode, the clutch of the vehicle is in a slipping state and the engine is in a driving state.

10. A vehicle mode control system, characterized in that: The system includes a vehicle controller and a transmission controller; wherein, The transmission controller is used to determine a second flag bit based on second operating condition information of the vehicle, and send the second flag bit to the vehicle controller; The vehicle controller is used to determine a first flag based on the first operating condition information of the vehicle, and to determine a low-speed direct drive function flag based on the first flag and the second flag; the low-speed direct drive function flag is used to indicate whether the vehicle is switched to a low-speed direct drive mode; wherein, in the low-speed direct drive mode, the clutch of the vehicle is in a slipping state and the engine is in a driving state.

11. A vehicle, characterized in that: Comprising the vehicle mode control system as claimed in claim 10.

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