Transmission ratio switching method, device, system, vehicle and readable storage medium

Abstract

The present application discloses a transmission ratio switching method, device, system, vehicle and readable storage medium, which relates to the field of vehicle technology, so as to achieve the goal of maintaining the same neutral angle of the steering wheel and steering wheel of the vehicle when switching the transmission ratio. The method includes: obtaining vehicle driving parameters in response to a first request message; the vehicle driving parameters include vehicle speed, steering wheel torque and lateral acceleration; when it is determined that the vehicle state meets the state switching conditions, determining whether the steering wheel and steering wheel of the vehicle are in a neutral state based on the steering wheel torque and lateral acceleration; when the steering wheel and steering wheel are in a neutral state, determining a first target transmission ratio based on the vehicle speed and a first mapping relationship, and switching the vehicle's transmission ratio to the first target transmission ratio; the vehicle state is used to characterize the smoothness of the vehicle's driving, and the first mapping relationship includes different vehicle speeds and corresponding transmission ratios under the target driving mode.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a transmission ratio switching method, device, system, vehicle and readable storage medium. Background Art

[0002] To enhance the user experience in different driving modes, current vehicles offer multi-mode electric power steering systems. These systems can modify the feel of the steering by varying the power assist, transmission ratio, damping, and other factors in different driving modes. Compared to conventional steering systems, variable-ratio steering systems offer a more direct steering ratio, enabling instantaneous shifting of the steering ratio based on vehicle speed.

[0003] However, when the transmission ratio is switched, the rotation angle relationship between the steering wheel and the steering wheel of the vehicle will change, which may cause the neutral angle of the steering wheel and the steering wheel of the vehicle to be inconsistent. Summary of the Invention

[0004] One of the purposes of the present invention is to provide a transmission ratio switching method, device, system, vehicle and readable storage medium to achieve consistency in the mid-angle of the vehicle's steering wheel and steering wheel when switching the transmission ratio.

[0005] According to the first aspect of the present application, a transmission ratio switching method is provided, the method comprising: obtaining vehicle driving parameters in response to a first request message; the first request message is used to request that the vehicle's driving mode be switched to a target driving mode; the vehicle driving parameters include vehicle speed, steering wheel torque, and lateral acceleration; when it is determined that the vehicle state meets the state switching conditions, determining whether the steering wheel and steering wheel of the vehicle are in a neutral state based on the steering wheel torque and the lateral acceleration; the vehicle state is used to characterize the smoothness of the vehicle's driving; when the steering wheel and steering wheel are in a neutral state, determining a first target transmission ratio based on the vehicle speed and a first mapping relationship, and switching the vehicle's transmission ratio to the first target transmission ratio; wherein the first mapping relationship includes different vehicle speeds and corresponding transmission ratios under the target driving mode.

[0006] According to the above technical means, in response to a first request message, vehicle driving parameters are obtained. If the vehicle state satisfies the state switching conditions, the vehicle's steering wheel and steering wheel are determined to be in a neutral position based on the steering wheel torque and lateral acceleration. Thus, whether the vehicle is in a straight-ahead state can be determined by determining whether the steering wheel and steering wheel are in a neutral position. Furthermore, if the steering wheel and steering wheel are in a neutral position, a first target transmission ratio is determined based on the vehicle speed and a first mapping relationship, and the vehicle's transmission ratio is switched to the first target transmission ratio. Because the vehicle state represents the smoothness of vehicle driving, this method can improve vehicle stability when switching transmission ratios. When the vehicle's steering wheel and steering wheel are in a neutral position, the steering wheel and steering wheel angles are both zero. Switching transmission ratios in this state does not result in a mismatch between the neutral angles at the steering wheel and steering wheel ends. This also avoids the problem of driving intention and actual driving being out of sync when switching transmission ratios around corners.

[0007] Furthermore, the vehicle driving parameters also include steering wheel torque, steering wheel speed, and gear signal; the method also includes: when it is determined that the vehicle driving parameters are credible data, determining the target steering wheel torque threshold according to the vehicle speed and the second mapping relationship, and determining the target steering wheel speed threshold according to the vehicle speed and the third mapping relationship; the second mapping relationship includes different vehicle speeds and corresponding steering wheel torque thresholds, and the third mapping relationship includes different vehicle speeds and corresponding steering wheel speed thresholds; when it is determined that the steering wheel torque is less than or equal to the target steering wheel torque threshold, the steering wheel speed is less than or equal to the target steering wheel speed threshold, and the gear signal is a non-reverse signal, determining that the vehicle state meets the state switching condition.

[0008] According to the above technical means, the target steering wheel speed threshold and the target steering wheel torque threshold can be updated in real time according to the vehicle speed. Since when the vehicle state meets the state switching conditions, the steering wheel torque is less than or equal to the target steering wheel torque threshold, the steering wheel speed is less than or equal to the target steering wheel speed threshold, and the gear signal is a non-reverse gear signal, the vehicle running state is relatively stable, which can improve the stability during transmission ratio switching.

[0009] Furthermore, determining whether the steering wheel and the steering wheel are in a neutral state is performed based on the steering wheel torque and the lateral acceleration, including: determining whether the vehicle is in a straight-ahead state based on the steering wheel torque and the lateral acceleration; and determining that the steering wheel and the steering wheel are in a neutral state when it is determined that the vehicle is in a straight-ahead state and the duration is greater than a duration threshold.

[0010] According to the above technical means, it is possible to determine whether the steering wheel and the steering wheel are in a neutral state through the steering wheel torque and the lateral acceleration, and switch the vehicle transmission ratio when the steering wheel and the steering wheel are in a neutral state, thereby avoiding the phenomenon of inconsistent neutral angles between the steering wheel end and the steering wheel end caused by switching the vehicle transmission ratio when the steering wheel and the steering wheel are not in a neutral state.

[0011] Furthermore, the method also includes: when it is determined that the vehicle state does not meet the state switching condition, or the steering wheel and the steering wheel are not in the neutral state, determining the second target transmission ratio according to the vehicle speed and the fourth mapping relationship, and switching the vehicle's transmission ratio to the second target transmission ratio; the fourth mapping relationship includes different vehicle speeds and corresponding transmission ratios in the current driving mode.

[0012] According to the above technical means, when the vehicle state does not meet the state switching conditions or the steering wheel and the steering wheel are not in the neutral state, the second target transmission ratio is determined according to the vehicle speed and the fourth mapping relationship, that is, the corresponding transmission ratio is determined according to the transmission ratio MAP of the current driving mode, thereby avoiding the problem of inconsistent neutral angles of the steering wheel and the steering wheel of the vehicle caused by switching the transmission ratio when the vehicle state does not meet the state switching conditions or the steering wheel and the steering wheel are not in the neutral state, and the problem of driving intention and actual driving being out of sync due to switching the transmission ratio at a turn.

[0013] Furthermore, the method also includes: obtaining a valid digit value corresponding to the vehicle driving parameter; and determining that the vehicle driving parameter is credible data when the valid digit value is a target value.

[0014] According to the above-mentioned technical means, by determining the validity of the vehicle driving parameters, it is possible to more accurately judge whether the vehicle can switch the transmission ratio, thereby avoiding switching the transmission ratio in the wrong situation, resulting in inconsistency between driving intention and actual driving, or causing inconsistency between the center position of the steering wheel and the steering wheel.

[0015] In a second aspect, a transmission ratio switching device is provided, including: an acquisition unit, a determination unit, and a switching unit; the acquisition unit is used to acquire vehicle driving parameters in response to a first request message; the first request message is used to request that the vehicle's driving mode be switched to a target driving mode; the vehicle driving parameters include vehicle speed, steering wheel torque, and lateral acceleration; the determination unit is used to determine whether the steering wheel and steering wheel of the vehicle are in a neutral state based on the steering wheel torque and lateral acceleration when it is determined that the vehicle state meets the state switching condition; the vehicle state is used to characterize the smoothness of the vehicle's driving; the determination unit is also used to determine a first target transmission ratio based on the vehicle speed and a first mapping relationship when the steering wheel and steering wheel are in a neutral state; the first mapping relationship includes different vehicle speeds and corresponding transmission ratios under the target driving mode; the switching unit is used to switch the vehicle's transmission ratio to the first target transmission ratio.

[0016] Furthermore, the vehicle driving parameters also include steering wheel torque, steering wheel speed, and gear signal; the determination unit is specifically used to: when it is determined that the vehicle driving parameters are credible data, determine the target steering wheel torque threshold according to the vehicle speed and the second mapping relationship, and determine the target steering wheel speed threshold according to the vehicle speed and the third mapping relationship; the second mapping relationship includes different vehicle speeds and corresponding steering wheel torque thresholds, and the third mapping relationship includes different vehicle speeds and corresponding steering wheel speed thresholds; when it is determined that the steering wheel torque is less than or equal to the target steering wheel torque threshold, the steering wheel speed is less than or equal to the target steering wheel speed threshold, and the gear signal is a non-reverse gear signal, determine that the vehicle state meets the state switching condition.

[0017] Furthermore, the determination unit is specifically used to: determine whether the vehicle is in a straight-ahead state based on the steering wheel torque and the lateral acceleration; if it is determined that the vehicle is in a straight-ahead state and the duration is greater than a duration threshold, determine that the steering wheel and the steering wheel are in a neutral state.

[0018] Furthermore, the switching unit is also used to: when it is determined that the vehicle state does not meet the state switching condition, or the steering wheel and the steering wheel are not in the neutral state, determine the second target transmission ratio according to the vehicle speed and the fourth mapping relationship, and switch the vehicle's transmission ratio to the second target transmission ratio; the fourth mapping relationship includes different vehicle speeds and corresponding transmission ratios in the current driving mode.

[0019] Furthermore, the acquisition unit is further used to obtain the valid digit value corresponding to the vehicle driving parameter; the determination unit is further used to determine that the vehicle driving parameter is credible data when the valid digit value is the target value.

[0020] In a third aspect, a transmission ratio switching system is provided, the transmission ratio switching system comprising a controller, the controller being configured to execute the method in the first aspect or any possible design of the first aspect.

[0021] In a fourth aspect, a transmission ratio switching device is provided, comprising: a processor; a memory for storing processor executable instructions; the processor is configured to execute the instructions, the functions performed in the first aspect or any possible design of the first aspect.

[0022] In a fifth aspect, a vehicle is provided, comprising the transmission ratio switching system provided in the third aspect.

[0023] In the sixth aspect, a transmission ratio switching device is provided, which can realize the functions performed by the transmission ratio switching device in the above-mentioned aspects or possible designs. The functions can be realized through hardware, such as: in one possible design, the transmission ratio switching device may include: a processor and a communication interface, and the processor can be used to support the transmission ratio switching device to realize the functions involved in the above-mentioned first aspect or any possible design of the first aspect.

[0024] In another possible design, the transmission ratio switching device may further include a memory for storing computer-executable instructions and data necessary for the transmission ratio switching device. When the transmission ratio switching device is in operation, the processor executes the computer-executable instructions stored in the memory to cause the transmission ratio switching device to perform the first aspect or any possible transmission ratio switching method of the first aspect.

[0025] In the seventh aspect, a computer-readable storage medium is provided, which may be a readable non-volatile storage medium. The computer-readable storage medium stores computer instructions or programs, which, when run on a computer, enables the computer to execute the first aspect or any possible transmission ratio switching method of the above aspects.

[0026] In an eighth aspect, a computer program product comprising instructions is provided, which, when executed on a computer, enables the computer to execute the transmission ratio switching method according to the first aspect or any possible design of the above aspects.

[0027] Beneficial effects of the present invention:

[0028] (1) In response to the first request message, the vehicle driving parameters are obtained. When it is determined that the vehicle state meets the state switching condition, the steering wheel and the steering wheel of the vehicle are determined to be in a neutral state based on the steering wheel torque and the lateral acceleration. In this way, whether the vehicle is in a straight-ahead state can be determined by whether the steering wheel and the steering wheel are in a neutral state. Furthermore, when the steering wheel and the steering wheel are in a neutral state, a first target transmission ratio is determined based on the vehicle speed and the first mapping relationship, and the transmission ratio of the vehicle is switched to the first target transmission ratio. Since the vehicle state is used to characterize the smoothness of the vehicle's driving, the vehicle stability when switching the transmission ratio can be improved. When the steering wheel and the steering wheel of the vehicle are in a neutral state, the angles of the steering wheel and the steering wheel are both 0. At this time, when the transmission ratio is switched, the phenomenon of inconsistent neutral angles between the steering wheel end and the steering wheel end will not occur. At the same time, the problem of driving intention and actual driving being out of sync caused by switching the transmission ratio at a turn is avoided.

[0029] (2) The target steering wheel speed threshold and the target steering wheel torque threshold can be updated in real time according to the vehicle speed. Since the vehicle state meets the state switching conditions, the steering wheel torque is less than or equal to the target steering wheel torque threshold, the steering wheel speed is less than or equal to the target steering wheel speed threshold, and the gear signal is a non-reverse gear signal, the vehicle operation state is relatively stable, which can improve the stability during the transmission ratio switching.

[0030] (3) The steering wheel torque and the lateral acceleration can be used to determine whether the steering wheel and the steering wheel are in the neutral state, and the vehicle transmission ratio can be switched when the steering wheel and the steering wheel are in the neutral state. This can avoid the phenomenon of inconsistent neutral angles between the steering wheel end and the steering wheel end caused by switching the vehicle transmission ratio when the steering wheel and the steering wheel are not in the neutral state.

[0031] (4) By determining the second target transmission ratio according to the vehicle speed and the fourth mapping relationship when the vehicle state does not satisfy the state switching condition or the steering wheel and the steering wheel are not in the neutral state, that is, determining the corresponding transmission ratio according to the transmission ratio MAP of the current driving mode, it is avoided that the neutral angles of the steering wheel and the steering wheel of the vehicle are inconsistent due to switching the transmission ratio when the vehicle state does not satisfy the state switching condition or the steering wheel and the steering wheel are not in the neutral state, and the driving intention and actual driving are out of sync due to switching the transmission ratio at a turn.

[0032] (5) By determining the validity of the vehicle's driving parameters, it is possible to more accurately determine whether the vehicle can switch the transmission ratio, thereby avoiding switching the transmission ratio in the wrong situation, resulting in inconsistency between driving intention and actual driving, or causing inconsistency between the center position of the steering wheel and the steering wheel.

[0033] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application, and do not constitute an improper limitation on the present application.

[0035] Figure 1 A schematic structural diagram of a transmission ratio switching system provided in an embodiment of the present application;

[0036] Figure 2 A schematic structural diagram of another transmission ratio switching system provided in an embodiment of the present application;

[0037] Figure 3 A schematic diagram of the structure of a steering state confirmation module provided in an embodiment of the present application;

[0038] Figure 4 A schematic structural diagram of a transmission ratio switching device provided in an embodiment of the present application;

[0039] Figure 5 A schematic flow chart of a transmission ratio switching method provided in an embodiment of the present application;

[0040] Figure 6 A schematic flow chart of another transmission ratio switching method provided in an embodiment of the present application;

[0041] Figure 7 A schematic diagram of a second mapping relationship provided in an embodiment of the present application;

[0042] Figure 8 A schematic diagram of a third mapping relationship provided in an embodiment of the present application;

[0043] Figure 9 A schematic structural diagram of a transmission ratio switching device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0044] In order to enable ordinary people in the art to better understand the technical solutions of the present disclosure, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0045] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the numbers used in this manner are interchangeable where appropriate so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the embodiments of the present application as detailed in the appended claims.

[0046] It will also be understood that the term “comprising” indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements and / or components.

[0047] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0048] To enhance user experience in different driving modes, current vehicles offer multi-mode electric power steering systems. These systems can adjust the feel of the steering in different driving modes by varying the power assist, transmission ratio, damping, and other factors. Compared to conventional steering systems, variable-ratio steering systems offer a more direct steering ratio, enabling instantaneous shifting of the steering ratio based on vehicle speed. This system adjusts the front wheel angle in real time based on vehicle speed, without affecting the steering system's responsiveness.

[0049] For example, when the vehicle speed changes from low to high, the variable transmission ratio mechanism's transmission ratio increases through the changes in the magnetic force and magnetic poles of the two electromagnets. When the vehicle speed changes from high to low, the variable transmission ratio mechanism's transmission ratio decreases through the changes in the magnetic force and magnetic pole orientation of the two electromagnets. This ensures that the steering ratio remains ideal as vehicle speed changes, ensuring the vehicle's steering system's flexibility at low speeds and stable handling at high speeds.

[0050] For example, the driving mode switch features multiple driving mode positions, each corresponding to a different accelerator pedal MAP. This improves driving comfort, avoids the potential for subjective evaluations of the vehicle and engine caused by a single driving mode, and provides users with multiple driving mode options, allowing them to select different driving modes based on their driving habits and road conditions. The driving mode switch includes four driving mode positions: Comfort, Economy, Power, and Test. Each position corresponds to a different accelerator pedal MAP. The driving mode switch outputs different current signals through different resistors. The electronic control unit then selects the corresponding accelerator pedal MAP based on the current signal.

[0051] However, the aforementioned driving mode switching technology is based on preset driving parameters. When switching driving modes, the parameters preset for one mode are changed to those preset for another mode. When switching the gear ratio, the rotation angle relationship between the vehicle's steering wheel and steering wheel changes, potentially causing the vehicle's steering wheel and steering wheel to have different neutral angles.

[0052] To ensure the mid-angle of the vehicle's steering wheel and steering wheel remains consistent before and after transmission ratio adjustment, existing transmission ratio adjustment strategies are generally divided into two categories: wheel-end adjustment, which uses the steering wheel as a reference to adjust the steering wheel angle. The other is rudder-end adjustment, which uses the steering wheel as a reference to rotate the steering wheel to the corresponding angle. When the transmission ratio changes continuously, these two strategies do not produce a noticeable difference in operation. However, when switching driving modes, the transmission ratio changes discontinuously. Both of these strategies can cause the vehicle's steering to be inconsistent with expectations, resulting in a poor driving experience for users. Furthermore, extensive manpower is required for subsequent wheel-end or steering-end adjustments.

[0053] In view of this, an embodiment of the present application provides a transmission ratio switching method, which includes: obtaining vehicle driving parameters in response to a first request message; the first request message is used to request that the vehicle's driving mode be switched to a target driving mode; the vehicle driving parameters include vehicle speed, steering wheel torque, and lateral acceleration; when it is determined that the vehicle state meets the state switching conditions, determining a first target transmission ratio based on the vehicle speed and a first mapping relationship; the vehicle state is used to characterize the smoothness of the vehicle's driving, and the first mapping relationship includes different vehicle speeds and corresponding transmission ratios in the target driving mode; determining whether the steering wheel and steering wheel of the vehicle are in a neutral state based on the steering wheel torque and lateral acceleration; when the steering wheel and steering wheel are in a neutral state, switching the vehicle's transmission ratio to the first target transmission ratio.

[0054] The method provided in the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0055] It should be noted that the transmission ratio switching system described in the embodiment of the present application is for the purpose of more clearly illustrating the technical solution of the embodiment of the present application, and does not constitute a limitation on the technical solution provided in the embodiment of the present application. A person skilled in the art will know that with the evolution of the transmission ratio switching system and the emergence of other transmission ratio switching systems, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.

[0056] Figure 1 A schematic diagram of the transmission ratio switching system 10 provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the gear ratio shifting system 10 may include a controller 11 and a vehicle 12 .

[0057] The controller 11 is connected to the vehicle 12. For example, the controller 11 and the vehicle 12 may be connected wirelessly or by wire, which is not limited in the embodiment of the present invention.

[0058] The controller 11 can be used to switch the transmission ratio of the vehicle according to the vehicle driving parameters. The controller 11 can be set inside the vehicle. At the same time, the controller 11 can also be any electronic device with data processing function.

[0059] The vehicle 12 can be used to transmit vehicle driving parameters to the controller 11. For example, the vehicle 12 can be any type of vehicle. For example, the vehicle can be a fuel vehicle, a hybrid vehicle, a new energy vehicle, etc. The embodiments of this application do not limit the specific technology, specific number, and specific device form used by the vehicle.

[0060] It should be noted that Figure 1 This is just an illustrative framework diagram. Figure 1 The names of the modules included in the Figure 1 In addition to the functional modules shown, other modules may also be included, which is not limited in the embodiments of the present application.

[0061] Figure 2 A schematic diagram of the transmission ratio switching system 20 provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, the transmission ratio switching system 20 may include an input signal diagnosis module, a vehicle state confirmation module, a steering state confirmation module, and a transmission ratio selection module.

[0062] The input signal diagnosis module is used to determine whether the vehicle driving parameters are credible data, and if the vehicle driving parameters are credible data, sends a status confirmation signal to the vehicle status confirmation module.

[0063] For example, the input signal diagnosis module can determine whether the vehicle driving parameters are reliable data by determining the mode switching status, steering wheel torque status, vehicle speed status, electric-power-steering (EPS) error signal, mode initialization status, steering wheel angle status, and lateral acceleration.

[0064] Among them, the vehicle status confirmation module is used to determine whether the vehicle status meets the state switching conditions based on the steering wheel torque, vehicle speed, steering wheel speed, gear signal, and vehicle function switch signal when receiving the status confirmation signal.

[0065] The transmission ratio selection module is used to determine the current transmission ratio MAP and the transmission ratio MAP of the target driving mode when a mode switching signal is received.

[0066] Among them, the steering state confirmation module is used to determine whether the vehicle is in a straight-ahead state based on the vehicle's lateral acceleration and steering wheel torque when the vehicle state meets the state switching conditions, and when the vehicle is in a straight-ahead state, switch the vehicle's transmission ratio to a first target transmission ratio based on the vehicle speed and the transmission ratio MAP of the target driving mode.

[0067] For example, Figure 3 As shown, the steering state confirmation module may include a neutral state confirmation module and a transmission ratio calculation module. The neutral state confirmation module is used to determine whether the steering wheel and the steering wheel of the vehicle are in the neutral state. The transmission ratio calculation module is used to calculate the transmission ratio of the vehicle.

[0068] When implementing it specifically, Figure 1 The controller in can be used Figure 4 The structure shown, or including Figure 4 Parts shown. Figure 4 This is a schematic diagram of the structure of a transmission ratio switching device 200 provided in an embodiment of the present application. The transmission ratio switching device 200 may be a controller in a transmission ratio switching system, or the transmission ratio switching device 200 may be a chip or system on chip in a controller. Figure 4 As shown, the transmission ratio switching device 200 includes a processor 201 , a communication interface 202 and a communication line 203 .

[0069] Furthermore, the transmission ratio switching device 200 may further include a memory 204 , wherein the processor 201 , the memory 204 and the communication interface 202 may be connected via a communication line 203 .

[0070] The processor 201 is a CPU, a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The processor 201 may also be other devices with processing functions, such as circuits, devices, or software modules, without limitation.

[0071] The communication interface 202 is used to communicate with other devices or other communication networks. The communication interface 202 can be a module, a circuit, a communication interface or any device capable of achieving communication.

[0072] The communication line 203 is used to transmit information between the various components included in the transmission ratio switching device 200.

[0073] The memory 204 is used to store instructions executable by the processor 201. The instructions may be computer programs.

[0074] The memory 204 may be a read-only memory (ROM) or other type of static storage device that can store static information and / or instructions, or a random access memory (RAM) or other type of dynamic storage device that can store information and / or instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compact disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, etc., without limitation.

[0075] It should be noted that memory 204 can exist independently of processor 201 or can be integrated with processor 201. Memory 204 can be used to store instructions, program code, or data. Memory 204 can be located within or outside of the transmission ratio switching device 200, without limitation. Processor 201 is configured to execute instructions stored in memory 204 to implement the transmission ratio switching method provided in the following embodiments of this application.

[0076] In one example, the processor 201 may include one or more CPUs, for example, Figure 4 CPU0 and CPU1 in.

[0077] As an optional implementation, the transmission ratio switching device 200 includes multiple processors, for example, Figure 4 In addition to the processor 201, a processor 205 may also be included.

[0078] It should be pointed out that Figure 4 The composition shown in the Figure 1 The limitations of each device in Figure 4 In addition to the parts shown, Figure 1 The controller may include Figure 4 More or fewer components, or combinations of certain components, or different arrangements of components.

[0079] In the embodiment of the present application, the chip system can be composed of chips, or can include chips and other discrete devices.

[0080] In addition, the actions and terms involved in the various embodiments of this application can refer to each other without limitation. The message names or parameter names in the messages exchanged between the various devices in the embodiments of this application are only examples, and other names can also be used in specific implementations without limitation.

[0081] The following combination Figure 1 The transmission ratio switching system shown describes the transmission ratio switching method provided in the embodiment of the present application.

[0082] The present application embodiment is described by taking the application to the controller as an example. Figure 5 As shown, the method includes the following S301-S304:

[0083] S301. The controller obtains vehicle driving parameters in response to a first request message.

[0084] The first request message is used to request that the vehicle's driving mode be switched to a target driving mode. For example, the driving mode may include a comfort mode, an economy mode, a power mode, etc. The vehicle driving parameters include vehicle speed, steering wheel torque, and lateral acceleration.

[0085] As a possible implementation manner, when the controller receives the first request message, it can obtain the vehicle driving parameters from multiple vehicle sensors connected to the controller.

[0086] It should be noted that the first request message may be a message generated in response to a user's control operation. For example, the control operation may be an operation input by the user through an in-vehicle display device, or an operation input by the user through a physical button provided in the vehicle.

[0087] S302: When determining that the vehicle state satisfies the state switching condition, the controller determines whether the steering wheel and the steering wheel of the vehicle are in a neutral state according to the steering wheel torque and the lateral acceleration.

[0088] When the vehicle's steering wheel and steering wheel are in a neutral position, the first angle is the same as the second angle, and the third angle is the same as the fourth angle. The first angle is the maximum left turning angle of the steering wheel when the vehicle's steering wheel is in a neutral position, the second angle is the maximum right turning angle of the steering wheel when the vehicle's steering wheel is in a neutral position, the third angle is the maximum left turning angle of the steering wheel when the vehicle's steering wheel is in a neutral position, and the fourth angle is the maximum right turning angle of the steering wheel when the vehicle's steering wheel is in a neutral position.

[0089] As a possible implementation method, the controller can determine whether the vehicle is in a straight-ahead state based on the steering wheel torque and lateral acceleration, and if it is determined that the vehicle is in a straight-ahead state and the duration is greater than a time threshold, determine that the steering wheel and the steering wheel are in a neutral state.

[0090] The duration threshold can be set as needed, for example, 500 milliseconds (ms).

[0091] It should be noted that the specific instructions for the controller to determine whether the vehicle is in a straight-ahead state based on the steering wheel torque and lateral acceleration can be found in the subsequent sections and will not be repeated here.

[0092] S303: When the steering wheel and the steering wheel are in a neutral state, the controller determines a first target transmission ratio according to the vehicle speed and the first mapping relationship.

[0093] The vehicle state is used to represent the stability of the vehicle's driving. The first mapping relationship (also referred to as the transmission ratio MAP of the target driving mode) includes different vehicle speeds and corresponding transmission ratios in the target driving mode.

[0094] For example, the first mapping relationship may be as shown in Table 1 below.

[0095] Table 1 First mapping relationship

[0096] Vehicle speed gear ratio 5 m / s 15 10 m / s 18 15 m / s 20 20 m / s 22

[0097] The data in Table 1 are merely exemplary. In the embodiment of the present application, the vehicle speed and transmission ratio may also include other data without limitation.

[0098] As a possible implementation manner, the controller may determine a transmission ratio having a mapping relationship with the vehicle speed from the first mapping relationship, and determine the transmission ratio as the first target transmission ratio.

[0099] It should be noted that the specific implementation method for determining whether the vehicle state meets the state switching condition will be described in subsequent sections and will not be repeated here in this application.

[0100] S304: The controller switches the transmission ratio of the vehicle to a first target transmission ratio.

[0101] As a possible implementation manner, the controller may switch the transmission ratio of the vehicle to the first target transmission ratio through the transmission.

[0102] The transmission is used to switch the vehicle's gear ratio. The transmission may include multiple clutches, each of which may correspond to a gear ratio. For example, the controller may control the transmission to engage a first target clutch to switch the vehicle's gear ratio to a first target gear ratio.

[0103] It should be noted that the first target clutch corresponds to the first target transmission ratio.

[0104] Based on the technical solution provided by this application, in response to a first request message, vehicle driving parameters are obtained. If the vehicle state is determined to meet state switching conditions, the vehicle's steering wheel and steering wheel are determined to be in a neutral position based on the steering wheel torque and lateral acceleration. Thus, whether the vehicle is in a straight-ahead state can be determined by determining whether the steering wheel and steering wheel are in a neutral position. Furthermore, if the steering wheel and steering wheel are in a neutral position, a first target transmission ratio is determined based on the vehicle speed and a first mapping relationship, and the vehicle's transmission ratio is switched to the first target transmission ratio. Because the vehicle state represents the smoothness of vehicle driving, this improves vehicle stability when switching transmission ratios. When the steering wheel and steering wheel are in a neutral position, the steering wheel and steering wheel angles are both zero. Switching transmission ratios in this state does not result in a mismatch between the neutral angles at the steering wheel and steering wheel ends. This also avoids the problem of driving intention and actual driving being out of sync when switching transmission ratios around corners.

[0105] In some embodiments, as Figure 6 As shown, in order to determine whether the vehicle state meets the state switching condition, the transmission ratio switching method of the present application may further include the following S401-S402.

[0106] S401. When determining that the vehicle driving parameters are credible data, the controller determines a target steering wheel torque threshold according to the vehicle speed and a second mapping relationship, and determines a target steering wheel speed threshold according to the vehicle speed and a third mapping relationship.

[0107] The second mapping relationship includes different vehicle speeds and corresponding steering wheel torque thresholds, and the third mapping relationship includes different vehicle speeds and corresponding steering wheel rotation speed thresholds.

[0108] For example, the second mapping relationship can be as follows Figure 7 As shown, the third mapping relationship can be as follows Figure 8 shown.

[0109] As a possible implementation, the controller may determine a steering wheel torque threshold value that is mapped to the vehicle speed from the second mapping relationship, and determine the steering wheel torque threshold value as the target steering wheel torque threshold value. The controller may determine a steering wheel speed threshold value that is mapped to the vehicle speed from the third mapping relationship, and determine the steering wheel speed threshold value as the target steering wheel torque threshold value.

[0110] It should be noted that the second mapping relationship and the third mapping relationship may be pre-stored in a database connected to the controller. Specific instructions for determining whether the vehicle driving parameters are credible data may be referred to in subsequent sections and will not be elaborated on here.

[0111] S402. The controller determines that the vehicle state meets the state switching condition when it determines that the steering wheel torque is less than or equal to the target steering wheel torque threshold, the steering wheel speed is less than or equal to the target steering wheel speed threshold, and the gear signal is a non-reverse gear signal.

[0112] The gear position signal may include a forward gear signal, a neutral gear signal, a non-reverse gear signal, etc.

[0113] As a possible implementation, the controller may obtain a first type signal and a second type signal from a comparator connected to the controller, and obtain a third type signal from a gear lever connected to the controller. The controller may determine, based on the first type signal, the second type signal, and the third type signal, whether the steering wheel torque is less than or equal to a target steering wheel torque threshold, whether the steering wheel speed is less than or equal to a target steering wheel speed threshold, and whether the gear signal is a non-reverse gear signal.

[0114] The first type of signal is used to indicate the magnitude relationship between the steering wheel torque and the target steering wheel torque threshold, and includes a first signal and a second signal. The first signal indicates that the steering wheel torque is less than or equal to the target steering wheel torque threshold, and the second signal indicates that the steering wheel torque is greater than the target steering wheel torque threshold.

[0115] The second type of signal is used to indicate the relationship between the steering wheel speed and the target steering wheel speed threshold. The second type of signal includes a third signal and a fourth signal. The third signal indicates that the steering wheel speed is less than or equal to the target steering wheel speed threshold, and the fourth signal indicates that the steering wheel torque is greater than the target steering wheel speed threshold.

[0116] The third type of signal is used to indicate the gear state of the vehicle, and includes a fifth signal and a sixth signal. The fifth signal indicates that the vehicle is in a non-reverse gear state, and the sixth signal indicates that the vehicle is in a reverse gear state.

[0117] The controller determines that the vehicle state satisfies the state switching condition when the first type signal is determined to be the first signal, the second type signal is the third signal, and the third type signal is the fifth signal. The controller determines that the vehicle state does not satisfy the state switching condition when the first type signal is determined to be the second signal, the second type signal is the fourth signal, or the third type signal is the sixth signal.

[0118] As another possible implementation method, the controller can determine the credibility of the vehicle driving data, and determine that the vehicle state meets the state switching conditions when the vehicle driving data is credible data, the steering wheel torque is less than or equal to the target steering wheel torque threshold, the steering wheel speed is less than or equal to the target steering wheel speed threshold, and the gear signal is a non-reverse gear signal.

[0119] According to the above technical means, the target steering wheel speed threshold and the target steering wheel torque threshold can be updated in real time according to the vehicle speed. Since when the vehicle state meets the state switching conditions, the steering wheel torque is less than or equal to the target steering wheel torque threshold, the steering wheel speed is less than or equal to the target steering wheel speed threshold, and the gear signal is a non-reverse gear signal, the vehicle running state is relatively stable, which can improve the stability during transmission ratio switching.

[0120] In a possible embodiment, in order to determine whether the steering wheel and the steering wheel are in a neutral state, the transmission ratio switching method of the present application may further include the following S501-S502.

[0121] S501: The controller determines whether the vehicle is in a straight-ahead state according to the steering wheel torque and the lateral acceleration.

[0122] As a possible implementation manner, the controller may determine whether the vehicle is in a straight-ahead state when the steering wheel torque and the lateral acceleration are less than or equal to a first threshold.

[0123] The first threshold can be set as needed, for example, it can be 0.

[0124] As another possible implementation, the controller may determine whether the vehicle is in a straight-ahead state based on a steering wheel angle and a steering wheel angle.

[0125] For example, the controller may determine that the vehicle is in a straight-ahead state when both the steering wheel angle and the steering wheel angle are less than a second threshold value. When the steering wheel angle or the steering wheel angle is greater than or equal to the second threshold value, the controller may determine that the vehicle is in a straight-ahead state.

[0126] The second threshold can be set as needed, for example, 10 degrees.

[0127] S502: When the controller determines that the vehicle is in a straight-ahead state and the duration of the state is greater than a duration threshold, the controller determines that the steering wheel and the steering wheel are in a neutral state.

[0128] As a possible implementation method, when the controller determines that the vehicle is in a straight-ahead state, the controller starts timing the timer connected to the controller, and when the timing reaches a time threshold, determines that the steering wheel and the steering wheel are in a neutral state.

[0129] In a possible embodiment, in order to avoid the situation where the neutral angles of the steering wheel and the steering wheel are inconsistent, the transmission ratio switching method provided in the embodiment of the present application may further include the following S601.

[0130] S601. When determining that the vehicle state does not meet the state switching condition or the steering wheel and the steering wheel are not in the neutral state, the controller determines a second target transmission ratio according to the vehicle speed and the fourth mapping relationship, and switches the vehicle's transmission ratio to the second target transmission ratio.

[0131] The fourth mapping relationship (also referred to as the transmission ratio MAP of the current driving mode) includes different vehicle speeds and corresponding transmission ratios in the current driving mode. The current driving mode is different from the target driving mode.

[0132] For example, the fourth mapping relationship may be as shown in Table 2 below.

[0133] Table 2 Fourth mapping relationship

[0134] Vehicle speed gear ratio 5 m / s 16 10 m / s 19 15 m / s 21 20 m / s 23

[0135] The data in Table 2 are merely exemplary. In the embodiment of the present application, the vehicle speed and transmission ratio may also include other data without limitation.

[0136] As a possible implementation manner, the controller may determine a transmission ratio having a mapping relationship with the vehicle speed from the fourth mapping relationship, and determine the transmission ratio as the second target transmission ratio.

[0137] In this way, when the vehicle state does not satisfy the state switching condition or the steering wheel and the steering wheel are not in the neutral state, the second target transmission ratio is determined according to the vehicle speed and the fourth mapping relationship, that is, the corresponding transmission ratio is determined according to the transmission ratio MAP of the current driving mode, thereby avoiding the problem of inconsistent neutral angles of the steering wheel and the steering wheel of the vehicle caused by switching the transmission ratio when the vehicle state does not satisfy the state switching condition or the steering wheel and the steering wheel are not in the neutral state, and the problem of driving intention and actual driving being out of sync due to switching the transmission ratio at a turn.

[0138] In a possible embodiment, in order to determine that the vehicle driving parameters are credible data, the transmission ratio switching method of the present application may further include the following S701-S702.

[0139] S701. The controller obtains the valid digit value corresponding to the vehicle driving parameter.

[0140] The valid digit value is used to indicate the validity of the vehicle driving parameters.

[0141] As a possible implementation, the controller may determine the effective digit value corresponding to the vehicle driving parameter from an internal input signal diagnosis module.

[0142] It should be noted that the input signal diagnosis module is provided with each vehicle driving parameter.

[0143] S702: When the value of the effective digits is the target value, the controller determines that the vehicle driving parameter is credible data.

[0144] The valid digit value may include a first value and a second value. For example, the first value may be 1 and the second value may be 0. The first value may be used to indicate that the vehicle driving parameter is valid data, and the second value may be used to indicate that the vehicle driving parameter is invalid data. The target value is the first value.

[0145] In this way, by determining the validity of the vehicle's driving parameters, it is possible to more accurately determine whether the vehicle can switch transmission ratios, thereby avoiding switching transmission ratios in incorrect scenarios, resulting in inconsistencies between driving intentions and actual driving, or inconsistencies between the center positions of the steering wheel and the steering wheel.

[0146] The various solutions in the above embodiments of the present application can be combined under the premise that there is no contradiction.

[0147] In the embodiment of the present application, the transmission ratio switching device or controller can be divided into functional modules or functional units according to the above method example. For example, each functional module or functional unit can be divided according to each function, or two or more functions can be integrated into one processing module. The above-mentioned integrated module can be implemented in the form of hardware or in the form of software functional modules or functional units. Among them, the division of modules or units in the embodiment of the present application is schematic and is only a logical functional division. There may be other division methods in actual implementation.

[0148] In the case of dividing each functional module into corresponding functional modules, Figure 9A structural schematic diagram of a transmission ratio switching device 900 is shown. The transmission ratio switching device 900 can be a controller or a chip used in a controller. The transmission ratio switching device 900 can be used to perform the functions of the controller involved in the above embodiments. Figure 9 The transmission ratio switching device 900 shown may include: an acquisition unit 901, a determination unit 902, and a switching unit 903; the acquisition unit 901 is used to acquire vehicle driving parameters in response to a first request message; the first request message is used to request that the vehicle's driving mode be switched to a target driving mode; the vehicle driving parameters include vehicle speed, steering wheel torque, and lateral acceleration; the determination unit 902 is used to determine whether the steering wheel and steering wheel of the vehicle are in a neutral state based on the steering wheel torque and lateral acceleration when it is determined that the vehicle state meets the state switching conditions; the vehicle state is used to characterize the smoothness of the vehicle's driving; the determination unit 902 is also used to determine a first target transmission ratio based on the vehicle speed and a first mapping relationship when the steering wheel and steering wheel are in a neutral state; the first mapping relationship includes different vehicle speeds and corresponding transmission ratios under the target driving mode; the switching unit 903 is used to switch the vehicle's transmission ratio to the first target transmission ratio.

[0149] Furthermore, the vehicle driving parameters also include steering wheel torque, steering wheel speed, and gear signal; the determination unit 902 is specifically used to: when it is determined that the vehicle driving parameters are credible data, determine the target steering wheel torque threshold according to the vehicle speed and the second mapping relationship, and determine the target steering wheel speed threshold according to the vehicle speed and the third mapping relationship; the second mapping relationship includes different vehicle speeds and corresponding steering wheel torque thresholds, and the third mapping relationship includes different vehicle speeds and corresponding steering wheel speed thresholds; when it is determined that the steering wheel torque is less than or equal to the target steering wheel torque threshold, the steering wheel speed is less than or equal to the target steering wheel speed threshold, and the gear signal is a non-reverse gear signal, determine that the vehicle state meets the state switching condition.

[0150] Furthermore, the determination unit 902 is specifically used to: determine whether the vehicle is in a straight-ahead state based on the steering wheel torque and the lateral acceleration; if it is determined that the vehicle is in a straight-ahead state and the duration is greater than a duration threshold, determine that the steering wheel and the steering wheel are in a neutral state.

[0151] Furthermore, the switching unit 903 is also used to: when it is determined that the vehicle state does not meet the state switching condition, or the steering wheel and the steering wheel are not in the neutral state, determine the second target transmission ratio according to the vehicle speed and the fourth mapping relationship, and switch the vehicle's transmission ratio to the second target transmission ratio; the fourth mapping relationship includes different vehicle speeds and corresponding transmission ratios in the current driving mode.

[0152] Furthermore, the acquisition unit 901 is further configured to acquire a valid digit value corresponding to the vehicle driving parameter; and the determination unit 902 is further configured to determine that the vehicle driving parameter is credible data when the valid digit value is a target value.

[0153] The embodiments of the present application also provide a computer-readable storage medium. All or part of the processes in the above-mentioned method embodiments can be completed by a computer program to instruct the relevant hardware. The program can be stored in the above-mentioned computer-readable storage medium. When the program is executed, it can include the processes of the above-mentioned method embodiments. The computer-readable storage medium can be the internal storage unit of the transmission ratio switching device or controller (including the data sending end and / or data receiving end) of any of the above-mentioned embodiments, such as the hard disk or memory of the transmission ratio switching device. The above-mentioned computer-readable storage medium can also be an external storage device of the above-mentioned transmission ratio switching device, such as a plug-in hard disk equipped on the above-mentioned transmission ratio switching device, a smart memory card (SMC), a secure digital (SD) card, a flash card, etc. Further, the above-mentioned computer-readable storage medium can also include both the internal storage unit of the above-mentioned transmission ratio switching device and an external storage device. The above-mentioned computer-readable storage medium is used to store the above-mentioned computer program and other programs and data required by the above-mentioned transmission ratio switching device. The above-mentioned computer-readable storage medium can also be used to temporarily store data that has been output or is to be output.

[0154] An embodiment of the present application also provides a vehicle, comprising the transmission ratio switching system, controller or transmission ratio switching device involved in the above method embodiment.

[0155] In addition, the actions and terms involved in the various embodiments of this application can refer to each other without limitation. The message names or parameter names in the messages exchanged between the various devices in the embodiments of this application are only examples, and other names can also be used in specific implementations without limitation.

[0156] It should be noted that the terms "first" and "second" in the specification, claims, and drawings of this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products, or devices.

[0157] It should be understood that in the present application, "at least one (item)" refers to one or more, "more than one" refers to two or more, "at least two (items)" refers to two or three and more than three, and "and / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0158] Through the description of the above implementation methods, technical personnel in the relevant field can clearly 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 assigned to 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.

[0159] In the several 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 schematic. For example, the division of the modules or units is merely 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 mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0160] The units described as separate components may or may not be physically separate, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple places. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0161] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0162] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a device (which can be a single-chip microcomputer, chip, etc.) or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

[0163] The above is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A transmission ratio switching method, characterized in that: The method comprises: In response to a first request message, obtaining vehicle driving parameters; the first request message is used to request switching the vehicle driving mode to a target driving mode; the vehicle driving parameters include vehicle speed, steering wheel torque, and lateral acceleration; When it is determined that the vehicle state satisfies the state switching condition, determining whether the steering wheel and the steering wheel of the vehicle are in a neutral state based on the steering wheel torque and the lateral acceleration; the vehicle state is used to represent the stability of the vehicle driving; When the steering wheel and the steering wheel are in a neutral state, determining a first target transmission ratio according to the vehicle speed and a first mapping relationship, and switching the transmission ratio of the vehicle to the first target transmission ratio; The first mapping relationship includes different vehicle speeds and corresponding transmission ratios under the target driving mode; The vehicle driving parameters also include steering wheel torque, steering wheel speed, and gear position signal; the method further includes: If the vehicle driving parameter is determined to be credible data, determining a target steering wheel torque threshold value based on the vehicle speed and a second mapping relationship, and determining a target steering wheel speed threshold value based on the vehicle speed and a third mapping relationship; the second mapping relationship including different vehicle speeds and corresponding steering wheel torque threshold values, and the third mapping relationship including different vehicle speeds and corresponding steering wheel speed threshold values; When it is determined that the steering wheel torque is less than or equal to the target steering wheel torque threshold, the steering wheel speed is less than or equal to the target steering wheel speed threshold, and the gear signal is a non-reverse gear signal, it is determined that the vehicle state meets the state switching condition.

2. The method according to claim 1, characterized in that The determining, based on the steering wheel torque and the lateral acceleration, whether the steering wheel and the steering wheel are in a neutral state includes: determining whether the vehicle is in a straight-ahead state according to the steering wheel torque and the lateral acceleration; When it is determined that the vehicle is in a straight-moving state and the duration thereof is greater than a duration threshold, it is determined that the steering wheel and the steering wheel are in a neutral state.

3. The method according to claim 1 or 2, characterized in that The method further comprises: When it is determined that the vehicle state does not meet the state switching condition, or the steering wheel and the steering wheel are not in the neutral state, the second target transmission ratio is determined according to the vehicle speed and the fourth mapping relationship, and the vehicle's transmission ratio is switched to the second target transmission ratio; the fourth mapping relationship includes different vehicle speeds and corresponding transmission ratios in the current driving mode.

4. The method according to claim 1, wherein The method further comprises: Obtaining a valid digit value corresponding to the vehicle driving parameter; When the value of the effective digits is the target value, the vehicle driving parameter is determined to be credible data.

5. A transmission ratio switching device, characterized in that: The device includes: an acquisition unit, a determination unit, and a switching unit; The acquiring unit is configured to acquire vehicle driving parameters in response to a first request message, wherein the first request message is used to request that the vehicle driving mode be switched to a target driving mode, and the vehicle driving parameters include vehicle speed, steering wheel torque, and lateral acceleration; The determining unit is configured to determine whether the steering wheel and the steering wheel of the vehicle are in a neutral state based on the steering wheel torque and the lateral acceleration when it is determined that the vehicle state satisfies the state switching condition; the vehicle state is used to represent a stable driving condition of the vehicle; The determining unit is further configured to determine a first target transmission ratio based on the vehicle speed and a first mapping relationship when the steering wheel and the steering wheel are in a neutral state; the first mapping relationship includes different vehicle speeds and corresponding transmission ratios under the target driving mode; The switching unit is configured to switch the transmission ratio of the vehicle to the first target transmission ratio; The vehicle driving parameters also include steering wheel torque, steering wheel speed, and gear position signal; the determination unit is specifically used to: If the vehicle driving parameter is determined to be credible data, determining a target steering wheel torque threshold value based on the vehicle speed and a second mapping relationship, and determining a target steering wheel speed threshold value based on the vehicle speed and a third mapping relationship; the second mapping relationship including different vehicle speeds and corresponding steering wheel torque threshold values, and the third mapping relationship including different vehicle speeds and corresponding steering wheel speed threshold values; When it is determined that the steering wheel torque is less than or equal to the target steering wheel torque threshold, the steering wheel speed is less than or equal to the target steering wheel speed threshold, and the gear signal is a non-reverse gear signal, it is determined that the vehicle state meets the state switching condition.

6. The device according to claim 5, characterized in that The determining unit is further configured to: determining whether the vehicle is in a straight-ahead state according to the steering wheel torque and the lateral acceleration; When it is determined that the vehicle is in a straight-moving state and the duration thereof is greater than a duration threshold, it is determined that the steering wheel and the steering wheel are in a neutral state.

7. The device according to claim 5 or 6, characterized in that The switching unit is further configured to: When it is determined that the vehicle state does not meet the state switching condition, or the steering wheel and the steering wheel are not in the neutral state, the second target transmission ratio is determined according to the vehicle speed and the fourth mapping relationship, and the vehicle's transmission ratio is switched to the second target transmission ratio; the fourth mapping relationship includes different vehicle speeds and corresponding transmission ratios in the current driving mode.

8. The device according to claim 5, characterized in that The acquisition unit is further configured to acquire a valid digit value corresponding to the vehicle driving parameter; The determining unit is further configured to determine, when the value of the effective digits is a target value, that the vehicle driving parameter is credible data.

9. A transmission ratio switching system, characterized in that: The transmission ratio switching system comprises a controller configured to execute the method according to any one of claims 1 to 4.

10. A transmission ratio switching device, characterized in that: include: processor; a memory for storing instructions executable by the processor; The processor is configured to execute the instructions to implement the method according to any one of claims 1 to 4.

11. A vehicle, characterized in that: Comprising the transmission ratio switching system as claimed in claim 9.

12. A computer-readable storage medium, characterized in that When the computer-executable instructions stored in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device can perform the method according to any one of claims 1 to 4.

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