Neutral gear locking control method and device and vehicle

Abstract

The invention discloses a neutral gear locking control method and device and a vehicle, and the method comprises the steps that a gearbox controller responds to a four-wheel-drive switching instruction sent by a user, a received four-wheel-drive switching signal set is determined, and the four-wheel-drive switching signal set comprises various four-wheel-drive switching signals; based on a pre-stored configuration word, determining a target four-wheel-drive switching signal corresponding to the target vehicle in the various four-wheel-drive switching signals; and executing the four-wheel drive switching instruction based on the target four-wheel drive switching signal. According to the vehicle type of the target vehicle, a target four-wheel drive switching signal capable of serving as a neutral gear locking strategy activation signal is determined; therefore, in the four-wheel-drive mode switching process, it is guaranteed that four-wheel-drive mode switching is conducted after the gearbox is locked in the neutral gear, and the situation that a transfer case is damaged due to tooth hitting is avoided.

Description

Technical Field

[0001] The present application relates to the field of automotive technology, and in particular to a neutral lock control method, device, and vehicle. Background Art

[0002] To prevent the transfer case assembly from being damaged when switching to four-wheel drive mode, the industry has implemented a neutral lock strategy for the transmission control unit (TCU) to prevent the transfer case assembly's external splines from not properly engaging with the input shaft's internal splines or the planetary carrier's external splines in longitudinally mounted vehicles. This strategy locks the transfer case in neutral when the transfer case is switched. The four-wheel drive system only initiates the four-wheel drive mode switch after detecting that the transfer case is locked in neutral. After the four-wheel drive mode switch is complete, the neutral lock function of the transmission controller automatically deactivates. This is disclosed in CN116025703A, "A Transfer Case Mode Switching Method, System, and Vehicle." During this four-wheel drive mode switch, the transmission controller's neutral lock identification signal—the ESP mode switch command (signal DrivingModReq_ESP)—serves as the activation signal for the neutral lock strategy.

[0003] However, in recent years, with the accumulation of vehicle models and the continuous increase in functions, the four-wheel drive system has evolved into a new generation of all-terrain systems that are independent of the all-terrain system and have a four-wheel drive master driving mode. In this case, the ESP mode switching command alone can no longer fully reflect the actual switching situation of the four-wheel drive system. This will indirectly cause the neutral lock strategy of the transmission controller to fail to activate correctly, and it will not be able to properly lock the neutral gear during the four-wheel drive switching process.

[0004] Therefore, how to ensure that the neutral lock logic corresponding to all vehicle models can be turned on normally has become a technical problem that technicians in this field urgently need to solve. Summary of the Invention

[0005] In view of the above problems, the present disclosure provides a neutral lock control method, device and vehicle that overcome the above problems or at least partially solve the above problems. The technical solutions are as follows: In a first aspect, an embodiment of the present application provides a neutral lock control method, comprising: a transmission controller determines a received four-wheel drive switch signal set in response to a four-wheel drive switching instruction issued by a user, wherein the four-wheel drive switch signal set includes multiple four-wheel drive switch signals; based on a pre-stored configuration word, determines a target four-wheel drive switch signal corresponding to a target vehicle from multiple four-wheel drive switch signals; and executes the four-wheel drive switching instruction based on the target four-wheel drive switch signal.

[0006] This application can determine the target four-wheel drive switch signal that can be used as the neutral lock strategy activation signal during the four-wheel drive mode switching process for target vehicles of different vehicle types based on the vehicle type. This ensures that the transmission is locked in neutral before the four-wheel drive mode is switched, preventing damage to the transfer case due to gear clashing.

[0007] Optionally, the pre-stored configuration word is generated based on the vehicle type of the target vehicle and is pre-written into the configuration word library of the target vehicle; each pre-stored configuration word corresponds to a switching instruction signal set; the switching instruction signal set includes a four-wheel drive switch signal and multiple switching logic signals.

[0008] By writing the configuration word in advance, the switching command signal set corresponding to the target vehicles of different models is determined. Among them, the configuration word can be written when the vehicle rolls off the assembly line according to the vehicle type, and is bound to the vehicle VIN code to ensure correct logical matching. At the same time, the above-mentioned neutral lock control method can also be covered to the sold models through system upgrades, software iterations, etc., without any changes to the vehicle hardware, no after-sales maintenance costs, and easy promotion. In addition to the four-wheel drive switch signal, the switching command signal set also includes multiple switching logic signals to ensure that the neutral gear is locked after the neutral lock strategy is activated. By setting the switching logic signal, it can help passengers lock the neutral gear, thereby preventing the transfer case assembly from having teeth hitting.

[0009] Optionally, the method of determining a target four-wheel drive switch signal corresponding to a target vehicle from a plurality of four-wheel drive switch signals based on a pre-stored configuration word specifically includes: obtaining a pre-stored configuration word from a configuration word library of the target vehicle; determining a switching instruction signal set of the target vehicle based on the pre-stored configuration word; and using the four-wheel drive switch signal included in the switching instruction signal set as the target four-wheel drive switch signal.

[0010] Optionally, executing the four-wheel drive switching instruction based on the target four-wheel drive switch signal specifically includes: identifying the target four-wheel drive switch signal and the signal values ​​of the multiple switching logic signals; when the signal value is a first preset signal value and the current gear is neutral, locking the current gear; when the signal value is a second preset signal value and the current gear is neutral, unlocking the gear lock state.

[0011] Optionally, executing the four-wheel drive switching instruction based on the target four-wheel drive switch signal specifically includes: obtaining the initial gear state of the target vehicle, the instruction issuance time of the four-wheel drive switching instruction, and the user's gear shifting action; based on the initial gear state, the instruction issuance time and the user's gear shifting action, determining that the target vehicle meets the preset working condition; and executing the four-wheel drive switching instruction by executing the switching logic signal corresponding to the preset working condition.

[0012] By obtaining the gear information of the target vehicle and the time when the four-wheel drive switching command is issued, the four-wheel drive switching command of the current target vehicle can be analyzed to determine whether the preset working conditions are met. If the preset working conditions are met, the four-wheel drive switching command can be executed by executing the switching logic signal.

[0013] Optionally, based on the initial gear state, the instruction issuance time and the user's gear shifting action, it is determined that the target vehicle meets the preset operating conditions, specifically including: if the initial gear state is neutral, and the user shifts the current gear from neutral to forward gear or reverse gear before the neutral gear is locked, so that the four-wheel drive switching instruction is not successfully executed within the first preset time period, then the first preset operating condition is met; if within the second preset time period after the first preset operating condition is met, the user does not shift the current gear from forward gear to neutral, so that the four-wheel drive switching instruction is still not successfully executed, then the second preset operating condition is met.

[0014] Specifically, a working condition determination method is provided to determine whether assistance is needed during the four-wheel drive mode switching process. Based on the gear information and the time when the command is issued, the problem encountered by the user during the four-wheel drive mode switching process can be determined, and whether the preset working conditions are met can be further determined. Thus, assistance measures corresponding to the preset working conditions can be provided to prevent the four-wheel drive mode switching process from lasting too long and reducing the user's driving experience.

[0015] Optionally, executing the four-wheel drive switching instruction by executing the switching logic signal corresponding to the preset operating condition specifically includes: determining that the target vehicle meets the first preset operating condition; receiving a first switching logic signal from the four-wheel drive system, and sending the first switching logic signal to the vehicle computer; the first switching logic signal includes a first preset text; sending the first preset text to the user through the vehicle computer to prompt the user to return the current gear to neutral; determining that the target vehicle meets the second preset operating condition; forcibly switching the current gear to neutral and locking it; receiving a second switching logic signal from the four-wheel drive system, and sending the second switching logic signal to the vehicle computer; the second switching logic signal includes a second preset text; and sending the second preset text to the user through the vehicle computer.

[0016] By providing the user with corresponding measures based on the preset operating conditions of the current target vehicle, it can assist the user in switching the four-wheel drive mode and prevent the transfer case assembly from causing gear clashing. At the same time, the vehicle computer can assist in displaying preset text to guide the user through the operation, avoiding the user's lack of knowledge of the operation and causing the four-wheel drive mode to fail.

[0017] Optionally, after executing the four-wheel drive switching instruction based on the target four-wheel drive switch signal, the method also includes: timing from the time the target vehicle enters the neutral lock state to obtain the duration of the neutral lock state; if the duration of a single neutral lock state is higher than a first preset time, the neutral lock state is released.

[0018] By setting a maximum duration for the neutral lock state, the user's control of the vehicle can be guaranteed, taking into account extreme operating conditions such as vehicle failure or the need to escape. By setting a maximum duration, the vehicle can meet driving conditions under extreme conditions and prevent the four-wheel drive mode switching process from being unable to engage gear due to abnormal conditions that cause the switching process to be too long.

[0019] According to a second aspect of an embodiment of the present application, a neutral lock control device is provided, comprising: a signal collection module, which determines a received four-wheel drive switch signal set in response to a four-wheel drive switching instruction issued by a user, wherein the four-wheel drive switch signal set includes a plurality of four-wheel drive switch signals; a signal locking module, which determines a target four-wheel drive switch signal corresponding to a target vehicle from a plurality of four-wheel drive switch signals based on a pre-stored configuration word; and an instruction execution module, which executes the four-wheel drive switching instruction based on the target four-wheel drive switch signal.

[0020] According to a third aspect of an embodiment of the present application, a vehicle is provided, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute: a transmission controller determines a received four-wheel drive switch signal set in response to a four-wheel drive switching instruction issued by a user, wherein the four-wheel drive switch signal set includes a plurality of four-wheel drive switch signals; based on a pre-stored configuration word, determines a target four-wheel drive switch signal corresponding to a target vehicle from a plurality of four-wheel drive switch signals; and executes the four-wheel drive switching instruction based on the target four-wheel drive switch signal.

[0021] By means of the above technical solution, the present disclosure provides a neutral lock control method, device, and vehicle. Based on the vehicle type of the target vehicle, the present disclosure determines a target four-wheel drive switch signal that can be used as a neutral lock strategy activation signal during the four-wheel drive mode switching process for target vehicles of different vehicle types. This ensures that the transmission is locked in neutral before the four-wheel drive mode switch is performed during the four-wheel drive mode switching process, avoiding damage to the transfer case due to tooth clashing. The method provided by the present disclosure can completely solve the problem of tooth clashing when the transfer case switches to four-wheel drive mode, without any changes to the vehicle hardware, no after-sales maintenance costs, and is easy to promote.

[0022] The above description is only an overview of the technical solution of the present disclosure. In order to more clearly understand the technical means of the present disclosure, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present disclosure more obvious and easy to understand, the specific implementation methods of the present disclosure are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present disclosure. The same reference symbols are used throughout the drawings to represent the same components. In the drawings: Figure 1 A schematic flow chart of a neutral lock control method provided by an embodiment of the present application is shown; Figure 2 A schematic structural diagram of a neutral lock control device provided in an embodiment of the present application is shown; Figure 3 A structural schematic diagram of a vehicle provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0024] Longitudinal vehicles often experience damage to the transfer case assembly due to internal reduction gear sleeve spline teeth striking each other. Analysis has revealed that the cause of the problem is that the external splines of the internal reduction gear sleeve fail to engage smoothly with the internal splines of the input shaft or the external splines of the planetary carrier when the transfer case enters or exits the low-speed gear mode of the four-wheel drive system.

[0025] Specifically, this is because the entire vehicle is in the forward gear driving state, the input shaft is rotating and has a large rotational torque, while the reduction gear sleeve of the transfer case is not rotating. A fixed, non-rotating part needs to cut into a high-speed rotating part, and the gears will not be able to cut in smoothly. If it stays in this state for a long time, the spline teeth will cause tooth collision.

[0026] In order to solve the above problems, the industry has established a neutral lock strategy for the transmission controller, that is, when the transfer case is switched, the transmission controller will be locked in neutral. The four-wheel drive system will only start to switch to the four-wheel drive mode after detecting that the transmission controller is locked in neutral. After the four-wheel drive mode is switched, the neutral lock function of the transmission controller is automatically turned off.

[0027] However, the transfer case gear knocking problem has not been eliminated and still occurs from time to time. The reason is that the neutral lock function of the transmission controller cannot be properly activated in certain situations, resulting in the neutral lock function failing. When the four systems are switched, the entire vehicle is still in the forward gear state, which eventually causes the transfer case gear knocking.

[0028] The reason the transmission controller's neutral lock function fails to activate correctly in certain situations is that, during the original four-wheel drive mode switching process, the transmission controller's neutral lock identification signal—the ESP mode switch command—serves as the activation signal for the neutral lock strategy. However, with the increasing number of vehicle models and features, the four-wheel drive system has evolved into a new generation of all-terrain systems, independent of the all-terrain system and with a primary four-wheel drive driving mode. In this case, relying solely on the ESP mode switch command no longer fully reflects the actual switching behavior of the four-wheel drive system on different vehicle models.

[0029] Here is a brief description of the reasons why the transfer case is jamming: The transfer case is an important transmission component for the vehicle to switch between two-wheel drive, four-wheel drive, and low-speed four-wheel drive modes. Among them, during the low-speed four-wheel drive mode switching process, the transmission needs to be in neutral and the vehicle speed needs to be less than 2km / h before the low-speed four-wheel drive mode can be switched. However, during the low-speed four-wheel drive mode switching process, due to the transmission delay of the CAN signal (Controller Area Network) and the different signal value validity assessment times of different controllers, the transmission may execute the user's shift operation command first and fail to lock the neutral gear, causing the vehicle to switch to the low-speed four-wheel drive mode while driving, thereby causing the transfer case's low-speed four-wheel drive shift mechanism to jam, damaging the transfer case hardware, and making the vehicle's low-speed four-wheel drive function unusable, affecting the user's driving experience.

[0030] Here's a clarification on the difference between the two all-terrain systems: The all-terrain system features a driving mode logic system that adapts to all terrain conditions, including economy, standard, sport, mud, sand, and more. Its mode shifts are accompanied by mode shifts in other vehicle systems, such as the engine, transmission, and four-wheel drive system. However, the new-generation all-terrain system's mode shifts are controlled by the four-wheel drive system. Only when the four-wheel drive system mode is switched does the new-generation all-terrain system switch its mode. If the four-wheel drive mode isn't switched, the new-generation all-terrain system can only switch within a limited range of modes. Both of these all-terrain systems are electronic stability systems.

[0031] To address the above issues, exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. The technical solutions provided by each embodiment of the present application are described in detail below with reference to the accompanying drawings.

[0032] Figure 1This is a flowchart illustrating a neutral lock control method provided in one or more embodiments of this specification. This method is applied during four-wheel drive mode switching to prevent transfer case gear jamming by locking the neutral gear. This process can be executed by a corresponding computing device (e.g., a transmission controller, vehicle computer, cloud server, etc.). Certain input parameters or intermediate results in the process can be manually adjusted to improve accuracy.

[0033] The analysis method involved in the embodiments of the present application can be implemented in a terminal device or a server, and the present application does not impose any special restrictions on this. For ease of understanding and description, the following embodiments are described in detail using a transmission controller as an example.

[0034] It should be noted that the server can be a single device or a system composed of multiple devices, that is, a distributed server, and this application does not make any specific restrictions on this.

[0035] like Figure 1 As shown, an embodiment of the present application provides a neutral lock control method, comprising: S101: The transmission controller determines a received four-wheel drive switch signal set in response to a four-wheel drive switch command issued by a user.

[0036] First, when the user needs to switch the vehicle mode to four-wheel drive mode (which can be low-speed four-wheel drive mode 4WD Low, or high-speed four-wheel drive mode 4WD HIGH), the user will send a four-wheel drive switching command to the vehicle computer. Specifically, the owner can send a four-wheel drive switching command through the gear lever or knob. At this time, after the transmission controller receives the four-wheel drive switching command from the user, the target vehicle will respond to the four-wheel drive switching command, thereby generating a variety of four-wheel drive switch signals. It should be noted that the corresponding signal encoding of each four-wheel drive switch signal is the same, but the sender and receiver are not exactly the same. At the same time, the four-wheel drive switch signals corresponding to different models are different, but the vehicle will simultaneously generate multiple four-wheel drive switch signals based on the four-wheel drive switching command issued by the user.

[0037] The following table shows examples of three types of four-wheel drive switch signals: Table 1, Four-wheel drive switch signal table

[0038] Here is an explanation of the signal coding of the above three four-wheel drive switch signals: the above three four-wheel drive switch signals all include multiple coding bits, and different coding bits correspond to different actual meanings. For example, the four-wheel drive switch signal contains eight coding bits, of which the second, sixth, and eighth bits can be set as reserved bits, and no actual meaning is set for the data of the reserved bits. The first coding bit is a mode error, the third coding bit is a two-wheel drive mode, the fourth coding bit is a high-speed four-wheel drive mode, the fifth coding bit is a four-wheel drive mode, and the seventh coding bit is a low-speed four-wheel drive mode. When the third coding bit of the four-wheel drive switch signal is 1 and the other coding bits are 0, this corresponds to the actual meaning of the third coding bit, that is, the vehicle is in two-wheel drive mode at this time.

[0039] Taking the three aforementioned four-wheel drive switch signals as an example, when the target vehicle responds to a four-wheel drive switch command, the three aforementioned four-wheel drive switch signals are generated. In the prior art, the four-wheel drive switch signal DrivingModReq_ESP is used as the activation signal for the neutral lock strategy. That is, upon receiving the four-wheel drive switch signal DrivingModReq_ESP, the vehicle determines whether to lock or unlock the neutral gear based on the signal value corresponding to DrivingModReq_ESP.

[0040] The above three four-wheel drive switch signals correspond to different types of vehicles and represent different four-wheel drive shift request forms, which can cover all four-wheel drive vehicle types. The specific distinctions are as follows: Vehicle models that only have an independent four-wheel drive switching hard switch use the FourDrvModSwtReq signal as the four-wheel drive switch signal for the four-wheel drive mode, which is directly sent by the four-wheel drive switch and executed by the four-wheel drive system. At this time, the body electronic stability system will adjust the mode request status of its own body electronic stability system according to the actual four-wheel drive mode status. The four-wheel drive system switching of this type of vehicle model is completely controlled by the four-wheel drive switch.

[0041] For models without an independent four-wheel drive hard switch, the four-wheel drive switching is processed and a command is issued by the all-terrain ESP system. At this time, the DrivingModReq_ESP signal is used, and the four-wheel drive system executes the ESP command signal DrivingModReq_ESP to switch the four-wheel drive mode.

[0042] For dual-control strategy models with independent hard switches and soft switches for four-wheel drive, the actual situation of the four-wheel drive system cannot be reflected by a single switch. For such models, a separate TOD_swich signal is developed. This signal is the actual four-wheel drive switch signal established internally after the four-wheel drive system integrates the hard switch and soft switch switching requests. This signal is jointly controlled by the hard switch and the soft switch, and the four-wheel drive system switches modes through the status instructions of the TOD_Switch signal.

[0043] S102: Determine a target four-wheel drive switch signal corresponding to a target vehicle from a plurality of four-wheel drive switch signals based on a pre-stored configuration word.

[0044] Since the vehicle types are different, the corresponding four-wheel drive switch signals are different. At this time, the target four-wheel drive switch signal corresponding to the target vehicle can be determined based on the configuration word pre-stored in the target vehicle.

[0045] In one embodiment, the pre-stored configuration word is generated based on the target vehicle type and is pre-written into the target vehicle's configuration word library. Each pre-stored configuration word corresponds to a set of switching command signals. Different vehicle types correspond to different pre-stored configuration words, and each pre-stored configuration word corresponds to a set of switching command signals. Each set of switching command signals includes a four-wheel drive switch signal and multiple switching logic signals. Different sets of switching command signals contain different four-wheel drive switch signals, but the switching logic signals are the same.

[0046] Specifically, when determining the pre-stored configuration word corresponding to the target vehicle, the target vehicle can be determined by whether it has a four-wheel drive independent switching hard switch and whether it is a dual-control strategy vehicle. If the target vehicle has a four-wheel drive independent switching hard switch and no dual-control strategy, that is, the target vehicle is a vehicle with only a four-wheel drive independent switching hard switch, the target vehicle can be assigned to the first pre-stored configuration word. If the target vehicle does not have a four-wheel drive independent switching hard switch, the target vehicle can be assigned to the second pre-stored configuration word. If the target vehicle has a four-wheel drive independent switching hard switch and a dual-control strategy vehicle, the target vehicle can be assigned to the third pre-stored configuration word. The above three pre-stored configuration words each correspond to a control strategy set.

[0047] After determining the pre-stored configuration words corresponding to the target vehicle, the pre-stored configuration words need to be flashed into the target vehicle in advance, so that the target vehicle can determine the corresponding control strategy set based on the pre-stored configuration words during the four-wheel drive mode switching process. The advance flashing here can be flashing the pre-stored configuration words into the target vehicle when the target vehicle is off the assembly line, and binding it with the vehicle VIN code to ensure correct logical matching. It can also be through system upgrades, software iterations, and FOTA. Writing the pre-stored configuration words into the sold vehicle through system upgrades can change the neutral lock control method of the sold vehicle without changing the vehicle hardware of the sold vehicle, thereby preventing the sold vehicle from having gear clashing when switching to four-wheel drive mode. This method has no after-sales maintenance costs and is easy to promote.

[0048] In one embodiment, the switching logic signal is used to execute the corresponding four-wheel drive mode switching logic under a preset working condition. An example of the switching logic signal is shown in the following table: Table 2, Switching logic signal table

[0049] Here, the signal encoding of the three switching logic signals is explained: The ModeChangeinPro signal contains two encoding bits, the first indicating that the vehicle is not in the mode switching state, and the second indicating that the vehicle is in the mode switching state. SystemOperMod has the same encoding bits as the three four-wheel drive switch signals mentioned above. Lock_N_Sts contains two encoding bits, the first indicating that the vehicle's neutral gear is unlocked, and the second indicating that the vehicle's neutral gear is locked.

[0050] The aforementioned switching command signal set may be pre-stored in a storage device of a computer device (e.g., a transmission controller or a vehicle computer). When a four-wheel drive mode switch is required, the computer device may select the switching command signal set from the storage device. Of course, the computer device may also obtain the switching command signal set from other external devices. For example, the switching command signal set may be stored in the cloud. When a four-wheel drive mode switch is required, the computer device may obtain the switching command signal set from the cloud. This embodiment does not limit the method for obtaining the switching command signal set.

[0051] It should be noted that while the above disclosure includes three types of four-wheel drive switch signals and three switching logic signals, this does not limit the signal types within the switching command signal set and is merely an example of the signal types. When switching four-wheel drive modes, other types of four-wheel drive switch signals or switching logic signals may exist and can be added to different switching command signal sets as needed.

[0052] In one embodiment, if it is determined that the software upgrade content includes an update of the pre-stored configuration characters corresponding to the target vehicle model, a prompt should be given to the user of the target vehicle before the software upgrade to encourage the user to consciously upgrade the software of the target vehicle. When providing the prompt, a special message such as "This update content can solve the transfer case gear jamming problem. For vehicle safety, it is recommended to upgrade as soon as possible" can be specially marked. At the same time, if it is detected that the user has not performed the upgrade, and the transfer case gear jamming problem occurs during the driving process of the target vehicle or in the user's driving feedback, the upgrade content will be pushed to the user through the vehicle computer, and user feedback will be continuously obtained until the user reports that the problem has been resolved.

[0053] For example, vehicle type A is a PHEV with an independent four-wheel drive switch and no dual-control strategy. When the vehicle software is flashed, a first pre-stored configuration word is automatically generated and written to the transmission controller after the transmission controller software is flashed. Upon recognizing the first pre-stored configuration word, the transmission controller automatically retrieves the corresponding internally identified four-wheel drive switch signal as the neutral lock strategy activation signal for vehicle type A, determining whether to lock or unlock the gears, thereby ensuring correct logic matching.

[0054] S103: Executing the four-wheel drive switching instruction based on the target four-wheel drive switch signal.

[0055] After the target four-wheel drive switch signal corresponding to the target vehicle is known, the target four-wheel drive switch signal can be used as the neutral lock strategy activation signal of the target vehicle, so that different vehicle models can ensure the execution of the neutral lock strategy during the four-wheel drive mode switching process.

[0056] In one embodiment, when executing a four-wheel drive switching command, it is necessary to first identify the target four-wheel drive switch signal and the signal values ​​of multiple switching logic signals. When the signal value is a first preset signal value and the current gear is in neutral, the current gear is locked; when the signal value is a second preset signal value and the current gear is in neutral, the gear lock state is unlocked. It should be noted that the above three four-wheel drive switch signals and three switching logic signals are continuously sent, and each signal corresponds to multiple signal values. For example, the first four-wheel drive switch signal FourDrvModSwtReq has different values ​​such as 0×1, 0×2, 0×3, 0×4, and 0×5, which can be understood as different states of the first four-wheel drive switch signal. When the transmission controller identifies the switching command signal set, it will simultaneously identify the corresponding four-wheel drive switch signal and the three switching logic signals to determine whether to lock or unlock the neutral gear.

[0057] For example, for models with independent switches, the corresponding four-wheel drive switch signal is the first four-wheel drive switch signal. When the state of the four-wheel drive switch signal is 0×2, the state of the first switching logic signal is 0×1, and the state of the second switching logic signal is 0×3, the neutral gear will be locked. After the neutral gear is locked, the third switching logic signal changes to 0×1.

[0058] The neutral lock strategy is described below: upon detecting a user-initiated low-speed four-wheel drive (FWD) shift command, the system determines whether the vehicle's motion state meets preset conditions and whether the transmission's current gear is neutral. If the vehicle's motion state meets the preset conditions and the transmission's current gear is neutral, the system sends a transfer case shift signal to the transmission controller, instructing the transmission controller to lock the transmission in neutral. Furthermore, the system determines whether the transmission's current gear remains in neutral for a first preset time period. If the transmission's current gear remains in neutral for the first preset time period, the system controls the transfer case to shift into low-speed FWD mode. It should be noted that when the transmission is in the neutral lock state, the transfer case will no longer experience drag during a low-speed FWD mode shift. However, when the transmission is in other gears, drag will still occur during a low-speed FWD mode shift, preventing the FWD mode shift from being successful.

[0059] The vehicle motion state herein may refer to the vehicle's current speed. The vehicle's current speed may be obtained by a speed sensor installed on the vehicle, which transmits the obtained speed to the vehicle's electronic stability control system. The vehicle's four-wheel drive control unit obtains the vehicle's motion state, i.e., the current speed information, from the vehicle's electronic stability control system. In practical applications, the current motion state may also include information about the slope of the road currently being traveled, information about the throttle opening, and vehicle vibration amplitude. The vehicle motion state may also meet predetermined conditions such as: the slope of the road currently being traveled being greater than a predetermined slope, the throttle opening being less than a predetermined throttle opening, and the vehicle vibration amplitude being less than a predetermined amplitude. After a period of time while the transmission is locked in neutral, the current gear position of the transmission may be reconfirmed to be in neutral. If the current gear position of the transmission is confirmed to be neutral, the low-speed four-wheel drive mode may be switched. This effectively avoids the problem of the transfer case's gears being rattled during the low-speed four-wheel drive mode switch due to the transmission shifting to another gear, thereby improving the reliability of the vehicle's low-speed four-wheel drive function and enhancing the user's driving experience.

[0060] In one embodiment, the transmission controller can also analyze the target vehicle's four-wheel drive switching command progress based on data such as the target vehicle's initial gear state, the time the four-wheel drive switching command was issued, and the user's gear shifting action to ensure that the four-wheel drive mode switching process can proceed smoothly. In particular, when the target vehicle meets the preset operating conditions, it is necessary to execute the control strategy based on the switching logic signal in the switching command signal set to prevent the four-wheel drive mode switching from being too long or even failing due to user operation errors, thereby reducing the user's driving experience.

[0061] Specifically, the preset operating conditions here include a first preset operating condition and a second preset operating condition. If the initial gear state is neutral, and the user shifts the current gear from neutral to forward gear or reverse gear when the neutral lock strategy is not activated, so that the four-wheel drive switching command is not successfully executed within the first preset time period (such as setting the first preset time period to 5s), the first preset operating condition is met, and the switching logic signal corresponding to the first preset operating condition is executed at this time.

[0062] In one embodiment, when executing a switching logic signal corresponding to a first preset operating condition, the transmission controller receives a first switching logic signal (such as the "ModeChangeinPro" signal in Table 2) from the four-wheel drive system and transmits the first switching logic signal to the vehicle computer. This first switching logic signal includes first preset text, enabling the vehicle computer to send or display the first preset text to the user, prompting the user to shift the current gear to neutral. The vehicle computer may display the first preset text via a device such as the target vehicle's instrument panel or the vehicle computer screen, or may announce the text via voice, allowing the user, especially the driver, to perform a corresponding action based on the preset text. The first preset text may include content such as "Four-wheel drive switching in progress, please ensure the vehicle is locked in N gear," prompting the driver to shift the gear to neutral. When executing the first switching logic signal, the execution time is recorded.

[0063] If the user has not shifted the current gear from the forward gear to the neutral gear within the second preset time period (such as setting the second preset time period to 5s) on the basis of satisfying the first preset operating condition, so that the four-wheel drive switching command has not been successfully executed, then the target vehicle satisfies the second preset operating condition at this time and executes the switching logic signal corresponding to the second preset operating condition.

[0064] In one embodiment, when executing the switching logic signal corresponding to the second preset operating condition, the transmission controller forcibly switches the current gear to neutral and locks the gear. Simultaneously, it receives a second switching logic signal from the four-wheel drive system (e.g., the SystemOperMod signal in Table 2) and transmits the second switching logic signal to the vehicle computer, causing the vehicle computer to transmit a second preset text contained in the second switching logic signal to the user. The second preset text may be, for example, "Switching to four-wheel drive mode, please ensure the vehicle is locked in neutral."

[0065] In one embodiment, to ensure user controllability, a maximum duration of a single neutral lock state can be set. In this case, the duration of the neutral lock state needs to be timed from the time the target vehicle enters the neutral lock state. If the duration of a single neutral lock is longer than a first preset time (such as 25 seconds), the neutral lock strategy is exited. By setting a single maximum duration of the neutral lock state, the user's controllability of the vehicle can be guaranteed while taking into account extreme operating conditions such as vehicle failure or the need to escape. By setting a maximum duration, the vehicle's driving conditions in extreme situations can be met and the four-wheel drive mode switching process can be prevented from being unable to engage gear due to abnormal conditions causing the switching duration to be too long.

[0066] In one embodiment, when determining whether to exit the neutral lock strategy, it is necessary to determine whether a transfer case mode switch end signal has been received. If the transfer case mode switch end signal has been received, the neutral lock strategy is released. If the transfer case mode switch end signal has not been received, the neutral lock is maintained until the maximum duration of a single neutral lock is reached. If the transfer case mode switch end signal has not been received after the maximum duration has reached, it may indicate a system failure. Continuing to lock the neutral position will render the vehicle unable to travel. At this time, the neutral lock is terminated and the neutral lock strategy is exited.

[0067] In one embodiment, to prevent the user from being unaware of the target vehicle's four-wheel drive mode switching function, the user can be proactively prompted to switch to four-wheel drive mode when the target vehicle is trapped, such as when it is stuck in a quagmire, running on muddy ground, or running on sand. Specifically, it is necessary to determine whether the target vehicle is in two-wheel drive mode, and obtain the target vehicle's operating condition information within a preset time period. The operating condition information here includes operating condition information such as wheel speed information, vehicle speed information, and engine load information. The operating condition information is then used to determine whether the target vehicle is in a trapped state. If the vehicle is in a trapped state, a third preset text is displayed on the vehicle computer to prompt the user to issue a four-wheel drive switching command to switch to four-wheel drive mode, thereby helping the user and the target vehicle escape.

[0068] In one embodiment, when analyzing whether a vehicle is stranded based on operating condition information, the speed of the four wheels can be used to determine whether the vehicle is in a stuck state. If the speed of the drive wheels is significantly higher than that of the non-drive wheels in two-wheel drive mode, the vehicle may be considered to be slipping or stuck in mud. The vehicle's slip ratio can also be calculated to determine whether the vehicle is stuck. Here, slip ratio = (drive wheel speed - non-drive wheel speed) / drive wheel speed × 100%. If the slip ratio is too high (e.g., >20%-30%), it indicates that the drive wheels are spinning and the vehicle may be stuck on low-grip surfaces such as mud or sand. Other parameters for determining whether the vehicle is stuck include engine speed, throttle opening, and actual torque output. If the engine speed is high and the torque output is high, but the vehicle speed is low or zero, it indicates that power is not being transmitted to the ground. After determining that the vehicle is stranded, the duration of the stuck state can be used to determine whether the user needs to be prompted to switch to four-wheel drive mode. It is understandable that if the target vehicle can quickly escape from the trapped state in the two-wheel drive mode, there is no need to prompt the user to switch to the four-wheel drive mode.

[0069] In one embodiment, if the target vehicle is detected to have escaped using four-wheel drive mode, the type of road surface after the escape can be obtained, and based on the road surface type, a decision can be made as to whether to prompt the user to switch to two-wheel drive mode. Specifically, if the collected operating parameters determine that the road surface is a normal road, the user can be prompted to switch the driving mode to two-wheel drive mode, thereby reducing energy consumption while being more suitable for driving on normal roads.

[0070] If after the vehicle is out of trouble and the user switches the driving mode to two-wheel drive mode, the driving wheel speed is still significantly higher than the non-driving wheel speed, a prompt will be sent to the user again, indicating that the vehicle is still slipping at this time, and the user is advised to switch the driving mode to four-wheel drive mode. At the same time, the four-wheel drive switching instructions issued by the user will be monitored.

[0071] The present disclosure provides a neutral lock control method, device, and vehicle. Based on the target vehicle type, the method determines a target four-wheel drive switch signal that can serve as a neutral lock strategy activation signal during a four-wheel drive mode switch for different target vehicles of different vehicle types. This ensures that the transmission is locked in neutral before switching to four-wheel drive mode, preventing damage to the transfer case due to tooth clashing. The method provided by the present disclosure can completely resolve the issue of tooth clashing during transfer case switching to four-wheel drive mode without requiring any changes to the vehicle hardware, eliminating after-sales repair costs, and facilitating widespread adoption.

[0072] like Figure 2 As shown, the embodiment of the present application further provides a neutral lock control device, comprising: The signal collection module 201 determines a received four-wheel drive switch signal set in response to a four-wheel drive switch instruction issued by a user, where the four-wheel drive switch signal set includes multiple four-wheel drive switch signals.

[0073] The signal locking module 202 determines a target four-wheel drive switch signal corresponding to a target vehicle from a plurality of four-wheel drive switch signals based on a pre-stored configuration word.

[0074] The instruction execution module 203 executes the four-wheel drive switching instruction based on the target four-wheel drive switch signal.

[0075] In a specific embodiment, the signal locking module 202 is used to obtain a pre-stored configuration word in the configuration word library of the target vehicle; based on the pre-stored configuration word, determine the switching instruction signal set of the target vehicle; and use the four-wheel drive switch signal included in the switching instruction signal set as the target four-wheel drive switch signal.

[0076] In a specific embodiment, the instruction execution module 203 includes: identifying the target four-wheel drive switch signal and the signal values ​​of the multiple switching logic signals; when the signal value is a first preset signal value and the current gear is neutral, locking the current gear; when the signal value is a second preset signal value and the current gear is neutral, unlocking the gear lock state.

[0077] In a specific embodiment, the instruction execution module 203 is used to obtain the initial gear state of the target vehicle, the instruction issuance time of the four-wheel drive switching instruction, and the user's gear shifting action; based on the initial gear state, the instruction issuance time and the user's gear shifting action, determine whether the target vehicle meets the preset operating conditions; and execute the four-wheel drive switching instruction by executing the switching logic signal corresponding to the preset operating conditions.

[0078] In a specific embodiment, the instruction execution module 203 is used to satisfy the first preset operating condition if the initial gear state is neutral and the user shifts the current gear from neutral to forward gear or reverse gear when the neutral lock strategy is not activated, so that the four-wheel drive switching instruction is not successfully executed within the first preset time period; if the user does not shift the current gear from forward gear to neutral within the second preset time period after the first preset operating condition is satisfied, so that the four-wheel drive switching instruction is still not successfully executed, then the second preset operating condition is satisfied.

[0079] In a specific embodiment, the instruction execution module 203 is used to determine whether the target vehicle meets the first preset operating condition; receive a first switching logic signal from the four-wheel drive system, and send the first switching logic signal to the vehicle computer; the first switching logic signal includes a first preset text; send the first preset text to the user through the vehicle computer to prompt the user to return the current gear to neutral; determine that the target vehicle meets the second preset operating condition; forcibly switch the current gear to neutral and lock it; receive a second switching logic signal from the four-wheel drive system, and send the second switching logic signal to the vehicle computer; the second switching logic signal includes a second preset text; send the second preset text to the user through the vehicle computer.

[0080] In a specific embodiment, the instruction execution module 203 is used to count from the time the target vehicle enters the neutral lock state to obtain the duration of the neutral lock state; if the duration of a single neutral lock state is longer than a first preset time, the neutral lock state is released.

[0081] In a specific embodiment, the neutral lock control device provided in the present application also includes a trapped state determination module for determining whether the target vehicle is in a two-wheel drive mode; obtaining the operating condition information of the target vehicle within a preset time period, the operating condition information including at least one of wheel speed information, vehicle speed information and engine load information; based on the operating condition information, determining that the target vehicle is in a trapped state; and displaying a third preset text through the vehicle computer to prompt the user to issue a four-wheel drive switching command.

[0082] Figure 3 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application.

[0083] For example, Figure 3 As shown, the vehicle includes: a memory 301 and a processor 302, wherein the memory 301 stores an executable program code 3011, and the processor 302 is used to call and execute the executable program code 3011 to perform the neutral lock control method.

[0084] This embodiment can divide the vehicle into functional modules based on the above-described method example. For example, each functional module can be mapped to a specific function, or two or more functions can be integrated into a single processing module. The integrated module can be implemented in hardware. It should be noted that the module division in this embodiment is illustrative and represents only one logical functional division. In actual implementation, other division methods may be used.

[0085] This embodiment can divide the vehicle into functional modules based on the above-described method example. For example, each functional module can be mapped to a specific function, or two or more functions can be integrated into a single processing module. The integrated module can be implemented in hardware. It should be noted that the module division in this embodiment is illustrative and represents only one logical functional division. In actual implementation, other division methods may be used.

[0086] In the case of dividing each functional module into corresponding functional modules, the vehicle may include: The signal collection module determines a received four-wheel drive switch signal set in response to a four-wheel drive switch instruction issued by a user, wherein the four-wheel drive switch signal set includes multiple four-wheel drive switch signals.

[0087] The signal locking module determines the target four-wheel drive switch signal corresponding to the target vehicle from a plurality of four-wheel drive switch signals based on a pre-stored configuration word.

[0088] The instruction execution module executes the four-wheel drive switching instruction based on the target four-wheel drive switch signal.

[0089] The embodiment of the present application further provides a non-volatile computer storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to: The transmission controller receives a four-wheel drive switching command issued by a user and identifies multiple four-wheel drive switch signals corresponding to the four-wheel drive switching command; determines a switching command signal set for the target vehicle based on the vehicle type of the target vehicle; determines a target four-wheel drive switch signal within the switching command signal set from the multiple four-wheel drive switch signals based on the switching command signal set; and uses the target four-wheel drive switch signal as a neutral lock strategy activation signal for the target vehicle.

[0090] This embodiment can divide the vehicle into functional modules based on the above-described method example. For example, each functional module can be mapped to a specific function, or two or more functions can be integrated into a single processing module. The integrated module can be implemented in hardware. It should be noted that the module division in this embodiment is illustrative and represents only one logical functional division. In actual implementation, other division methods may be used.

[0091] In the case of dividing each functional module into corresponding functional modules, the vehicle may include: a first signal recognition module, a strategy set module, etc. It should be noted that all relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module and will not be repeated here.

[0092] The vehicle provided in this embodiment is configured to implement the aforementioned neutral lock control method, thereby achieving the same effects as the aforementioned implementation method. When using an integrated unit, the vehicle may include a processing module and a storage module. The processing module may be used to control and manage vehicle operations. The storage module may be used to support the vehicle's execution of program code and data.

[0093] The processing module may be a processor or controller that implements or executes the various exemplary logic blocks, modules, and circuits disclosed herein. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processing (DSP) and a microprocessor, and the storage module may be a memory.

[0094] This embodiment also provides a computer-readable storage medium, which stores computer program code (including but not limited to disk storage, CD-ROM, optical storage, etc.). When the computer program code runs on a computer, the computer executes the above-mentioned related method steps to implement a neutral lock control method provided in the above embodiment.

[0095] This embodiment further provides a computer program product. When the computer program product is executed on a computer, the computer executes the above steps to implement the neutral lock control method provided in the above embodiment. The beneficial effects of the above embodiment can be referred to the beneficial effects of the corresponding method provided above, and will not be repeated here.

[0096] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0097] These computer program instructions may also be stored in a computer readable memory that can direct 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 The function specified in one or more boxes.

[0098] 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 A step that specifies a function in one or more boxes.

[0099] Although 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 become aware of the basic inventive concepts. 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.

[0100] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the coupling or direct coupling or communication connection between each other 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. In the description of this disclosure, it should be understood that if the terms "upper", "lower", "front", "back", "left" and "right" are used to indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation of this disclosure.

[0101] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. It should also be noted that the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity, or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, commodity, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, commodity, or device that includes the element.

[0102] The above are merely examples of the present disclosure and are not intended to limit the present disclosure. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure are intended to be included within the scope of the claims of the present disclosure.

Claims

1. A neutral lock control method, characterized in that: include: The transmission controller determines a received four-wheel drive switch signal set in response to a four-wheel drive switch command issued by a user, wherein the four-wheel drive switch signal set includes multiple four-wheel drive switch signals; Determining a target four-wheel drive switch signal corresponding to a target vehicle from a plurality of four-wheel drive switch signals based on a pre-stored configuration word; The four-wheel drive switching instruction is executed based on the target four-wheel drive switch signal.

2. The method according to claim 1, characterized in that The pre-stored configuration word is generated based on the vehicle type of the target vehicle and is pre-written into the configuration word library of the target vehicle; Each pre-stored configuration word corresponds to a switching instruction signal set; the switching instruction signal set includes a four-wheel drive switch signal and multiple switching logic signals.

3. The method according to claim 2, characterized in that The determining of the target four-wheel drive switch signal corresponding to the target vehicle from a plurality of four-wheel drive switch signals based on the pre-stored configuration word specifically includes: Obtaining pre-stored configuration words in the configuration word library of the target vehicle; Determining a switching command signal set for the target vehicle based on the pre-stored configuration word; The four-wheel drive switch signal included in the switching instruction signal set is used as the target four-wheel drive switch signal.

4. The method according to claim 2, characterized in that The executing the four-wheel drive switching instruction based on the target four-wheel drive switch signal specifically includes: identifying the target four-wheel drive switch signal and the signal values ​​of the plurality of switching logic signals; When the signal value is the first preset signal value and the current gear is neutral, locking the current gear; When the signal value is a second preset signal value and the current gear is neutral, the gear lock state is unlocked.

5. The method according to claim 1, wherein The executing the four-wheel drive switching instruction based on the target four-wheel drive switch signal specifically includes: Acquiring the initial gear state of the target vehicle, the time when the four-wheel drive switching command is issued, and the user's gear shifting action; Determining that the target vehicle meets a preset operating condition based on the initial gear state, the time when the instruction is issued, and the user's gear shifting action; The four-wheel drive switching instruction is executed by executing the switching logic signal corresponding to the preset working condition.

6. The method according to claim 5, characterized in that The determining that the target vehicle meets the preset operating condition based on the initial gear state, the instruction issuance time, and the user's gear shifting action specifically includes: If the initial gear state is neutral, and the user shifts the current gear from neutral to forward gear or reverse gear before neutral is locked, so that the four-wheel drive switching instruction is not successfully executed within the first preset time period, then the first preset operating condition is met; If the user does not shift the current gear from the forward gear to the neutral gear within a second preset time period after the first preset operating condition is met, so that the four-wheel drive switching instruction is still not successfully executed, then the second preset operating condition is met.

7. The method according to claim 6, characterized in that The executing the four-wheel drive switching instruction by executing the switching logic signal corresponding to the preset working condition specifically includes: Determining that the target vehicle meets a first preset operating condition; receiving a first switching logic signal from the four-wheel drive system and sending the first switching logic signal to the vehicle computer; the first switching logic signal includes a first preset text; Sending the first preset text to the user through the vehicle computer to prompt the user to return the current gear to neutral; Determining that the target vehicle meets a second preset operating condition; Force the current gear to be switched to neutral and locked; receiving a second switching logic signal from the four-wheel drive system and sending the second switching logic signal to the vehicle computer; the second switching logic signal includes a second preset text; The second preset text is sent to the user through the vehicle computer.

8. The method according to claim 1, characterized in that After executing the four-wheel drive switching instruction based on the target four-wheel drive switch signal, the method further includes: Timing is started from the time when the target vehicle enters the neutral lock state, so as to obtain the duration of the neutral lock state; If the duration of the single neutral lock state is longer than the first preset time, the neutral lock state is released.

9. A neutral lock control device, characterized in that: include: a signal collection module, in response to a four-wheel drive switching instruction issued by a user, determining a received four-wheel drive switch signal collection, wherein the four-wheel drive switch signal collection includes a plurality of four-wheel drive switch signals; A signal locking module, based on a pre-stored configuration word, determines a target four-wheel drive switch signal corresponding to a target vehicle from among a plurality of four-wheel drive switch signals; The instruction execution module executes the four-wheel drive switching instruction based on the target four-wheel drive switch signal.

10. A vehicle, characterized in that: include: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform: The transmission controller determines a received four-wheel drive switch signal set in response to a four-wheel drive switch command issued by a user, wherein the four-wheel drive switch signal set includes multiple four-wheel drive switch signals; Determining a target four-wheel drive switch signal corresponding to a target vehicle from a plurality of four-wheel drive switch signals based on a pre-stored configuration word; The four-wheel drive switching instruction is executed based on the target four-wheel drive switch signal.

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