Vehicle drive axle protection method and vehicle

Abstract

The present application provides a vehicle drive axle protection method and a vehicle, the method is applied to a vehicle that uses a high-horsepower engine to replace a low-horsepower engine, and is executed by an engine controller, the method comprising: obtaining the current gear position and vehicle operation mode of the vehicle, the current gear position and vehicle operation mode are obtained through the vehicle controller, and the vehicle operation mode is one of a power mode, a normal mode, and a torque strong limit mode; according to the current gear position and vehicle operation mode, determining the maximum output torque limit, and limiting the torque of the vehicle at the maximum output torque limit. The method of the present application is conducive to accurately limiting the torque of the vehicle in stages, thereby helping to protect the life of the drive axle.

Description

Technical Field

[0001] The present application relates to torque control technology, and more particularly to a vehicle drive axle protection method and a vehicle. Background Art

[0002] In recent years, the domestic logistics industry is booming, and the road logistics sector is the main force in the logistics industry. With the intensification of industry competition and the increase in fuel costs, higher requirements are placed on the operating costs of commercial vehicles.

[0003] In order to meet the requirements of lightweight and high timeliness of vehicles, high-horsepower and high-lightweight models have become popular models in the current commercial vehicle logistics field. Even if the high-horsepower engine replaces the original low-horsepower engine, the drive axle structure remains unchanged.

[0004] However, high-horsepower engines have strong power and torque, which places higher demands on the torque-bearing capacity of the drive axle. If the drive axle structure remains unchanged, it will not be conducive to protecting the life of the drive axle. Summary of the invention

[0005] The present application provides a vehicle drive axle protection method and a vehicle, which is used to replace a low-horsepower engine with a high-horsepower engine without structurally strengthening the drive axle, but to limit the torque of the drive axle according to different vehicle states, thereby achieving a high-horsepower, high-lightweight vehicle model, while also effectively protecting the life of the drive axle.

[0006] In one aspect, the present application provides a vehicle drive axle protection method, which is applied to a vehicle that uses a high-horsepower engine to replace a low-horsepower engine, and is executed by an engine controller. The method includes:

[0007] Acquire a current gear position and a vehicle operation mode of the vehicle, wherein the current gear position and the vehicle operation mode are obtained by a vehicle controller, and the vehicle operation mode is one of a power mode, a normal mode, and a torque strong limit mode;

[0008] A maximum output torque limit is determined according to the current gear position and the vehicle operating mode, and the vehicle is torque-limited at the maximum output torque limit.

[0009] In another possible implementation, if the vehicle operating mode is the power mode, determining the maximum output torque limit value according to the current gear position and the vehicle operating mode includes:

[0010] The smaller one of the first torque and the maximum torque value of the high-horsepower engine is used as the maximum output torque limit; the first torque is the maximum output torque limit calculated based on the rated torque of the drive axle and the current gear, and the first torque is also related to the gearbox speed ratio of the vehicle, the drive axle speed ratio, the comprehensive transmission efficiency of the gearbox and the drive axle;

[0011] When the vehicle operation mode is the power mode, the vehicle satisfies at least one of the following conditions: the vehicle throttle opening is greater than a preset throttle opening threshold, the gearbox gear is in S mode, and the vehicle slope is greater than a preset slope threshold.

[0012] In another possible implementation, the torque strong limiting mode includes a first torque strong limiting mode and a second torque strong limiting mode, and determining the maximum output torque limit value according to the current gear position and the vehicle operation mode includes:

[0013] When the vehicle operation mode is the first strong torque limiting mode, the differential lock signal of the vehicle indicates that the vehicle differential lock is in an enabled state; when the vehicle operation mode is the second strong torque limiting mode, the wheel slip signal of the ABS / EBS system of the vehicle indicates that the vehicle is in a slipping state;

[0014] If the vehicle operation mode is the first torque strong limiting mode, the maximum output torque limit value in the first torque strong limiting mode is calculated according to a preset limit coefficient and the maximum output torque limit value of the current gear in the power mode; the preset limit coefficient is determined by the inter-wheel differential lock and the inter-axle differential lock;

[0015] If the vehicle operation mode is the second torque strong limitation mode, the current torque value is step-limited according to preset rules, and the torque when the ABS / EBS system wheel slip signal indicates that the vehicle changes from a slipping state to a non-slipping state is used as the maximum output torque limit value in the second torque strong limitation mode.

[0016] In another possible implementation, if the vehicle operation mode is a normal mode, determining the maximum output torque limit value according to the current gear position and the vehicle operation mode includes:

[0017] When the current gear position is not greater than a first threshold, the maximum output torque limit is determined according to a first formula; the first formula is:

[0018]

[0019] Wherein, n is used to represent the current gear position, T Nn It is used to indicate the maximum output torque limit value in the normal mode and the nth gear, T 小马力 is the maximum torque value of the small horsepower engine, t i大马力 is the target torque response time of the i-th point of the maximum torque speed point of the high-horsepower engine, a is the statistical point number of the maximum torque speed point of the high-horsepower engine, t i小马力is the target torque response time of the i-th point of the maximum torque speed point of the small horsepower engine, and b is the statistical number of the maximum torque speed point of the small horsepower engine;

[0020] When the current gear is not less than a second threshold, the maximum torque limit of the high horsepower engine is used as the maximum output torque limit; the second threshold is greater than the first threshold;

[0021] When the current gear is greater than the first threshold and less than the second threshold, a linear correction is performed according to the maximum output torque limit at the first threshold and the maximum torque output limit at the second threshold to obtain the maximum output torque limit at the current gear.

[0022] In a second aspect, the present application provides a vehicle drive axle protection method, which is applied to a vehicle that uses a high-horsepower engine to replace a low-horsepower engine and is executed by a vehicle controller. The method includes:

[0023] Obtaining the current gear position and vehicle operation information, wherein the vehicle operation information includes the gear position of the transmission, the slope of the vehicle, the throttle opening of the vehicle, the wheel slip signal of the ABS / EBS system, and the differential lock signal;

[0024] Determining a vehicle operation mode according to the vehicle operation information; the vehicle operation mode is one of a power mode, a normal mode, and a strong torque limit mode;

[0025] The current gear position and the vehicle operating mode are sent to an engine controller, so that the engine controller limits the torque of the vehicle according to the current gear position and the vehicle operating mode.

[0026] In another possible implementation, determining the vehicle operation mode according to the vehicle operation information includes:

[0027] If the vehicle operation information satisfies at least one of the first preset conditions, the vehicle operation mode is determined to be the power mode; the first preset condition includes: the vehicle throttle opening is greater than a preset throttle opening threshold, the gearbox gear is in S mode, and the vehicle slope is greater than a preset slope threshold;

[0028] If the vehicle operation information does not satisfy any one of the first preset conditions and satisfies at least one of the second preset conditions, it is determined that the vehicle operation mode is the strong torque limit mode, and the second preset condition is: the differential lock signal indicates that the vehicle differential lock is in an enabled state; the ABS / EBS system wheel slip signal indicates that the vehicle is in a slipping state;

[0029] If the vehicle operation information does not meet a third preset condition, the vehicle operation mode is determined to be the normal mode, and the third preset condition includes a first preset condition and a second preset condition.

[0030] In another possible implementation, the strong torque limiting mode includes a first strong torque limiting mode and a second strong torque limiting mode, and determining that the vehicle operation mode is the strong torque limiting mode includes:

[0031] If the differential lock signal indicates that the vehicle differential lock is in an enabled state, determining that the vehicle operating mode is the first strong torque limiting mode;

[0032] If the wheel slip signal of the ABS / EBS system indicates that the vehicle is in a slipping state, the vehicle operation mode is determined to be the second strong torque limiting mode.

[0033] In a third aspect, the present application provides a vehicle drive axle protection device, the device comprising a first acquisition module and a limiting module, wherein:

[0034] The first acquisition module is used to acquire the current gear position and the vehicle operation mode of the vehicle, wherein the current gear position and the vehicle operation mode are obtained through the vehicle controller, and the vehicle operation mode is one of a power mode, a normal mode, and a torque strong limit mode;

[0035] The torque limiting module is used to determine a maximum output torque limit value according to the current gear position and the vehicle operation mode, and to limit the torque of the vehicle at the maximum output torque limit value.

[0036] In a fourth aspect, the present application provides a vehicle drive axle protection device, the device comprising a second acquisition module, a determination module and a sending module, wherein:

[0037] The second acquisition module is used to acquire the current gear position and vehicle operation information, wherein the vehicle operation information includes the gear position of the transmission, the slope of the vehicle, the throttle opening of the vehicle, the wheel slip signal of the ABS / EBS system, and the differential lock signal;

[0038] The determination module is used to determine a vehicle operation mode according to the vehicle operation information; the vehicle operation mode is one of a power mode, a normal mode, and a strong torque limit mode;

[0039] The sending module is used to send the current gear position and the vehicle operating mode to the engine controller, so that the engine controller limits the torque of the vehicle according to the current gear position and the vehicle operating mode.

[0040] In a fifth aspect, the present application provides a vehicle, the vehicle comprising an engine controller and a vehicle controller, wherein:

[0041] The vehicle controller is used to obtain the current gear position and vehicle operation information, wherein the vehicle operation information includes the gear position of the transmission, the road slope, the throttle opening, the wheel slip signal of the ABS / EBS system, and the differential lock signal; the vehicle controller is connected to the engine controller, and the vehicle controller is also used to execute the method as described in any one of the second aspects;

[0042] The engine controller is a controller for a high-horsepower engine, which is used to obtain the current gear position and the vehicle operation information, and determine the maximum output torque limit based on the current gear position and the vehicle operation information, and limit the torque of the vehicle with the maximum output torque limit; the engine controller is also used to execute the method described in any one of the first aspects.

[0043] In another possible implementation, the vehicle further includes:

[0044] a differential lock controller, connected to the vehicle controller, for monitoring whether the vehicle differential lock is in an enabled state, so as to obtain a differential lock signal, and send the differential lock signal to the vehicle controller;

[0045] A vehicle speed sensor, connected to the vehicle controller, for monitoring the throttle opening and sending the throttle opening to the vehicle controller;

[0046] A gearbox controller, connected to the vehicle controller, for monitoring the gear position of the gearbox, and sending the gear position of the gearbox to the vehicle controller;

[0047] A slope sensor, connected to the vehicle controller, for monitoring the road slope to obtain the slope of the vehicle, and sending the slope of the vehicle to the vehicle controller;

[0048] The EBS / ABS controller is connected to the vehicle controller and is used to monitor the wheel slip signal of the ABS / EBS system and send the wheel slip signal of the ABS / EBS system to the vehicle controller.

[0049] In a sixth aspect, the present application provides an electronic device, including: at least one processor and a memory;

[0050] The memory stores computer-executable instructions;

[0051] The at least one processor executes the computer-executable instructions stored in the memory, so that the at least one processor executes the vehicle drive axle protection method as described in any one of the first aspect or the second aspect above.

[0052] In a seventh aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the vehicle drive axle protection method as described in any one of the first aspect or the second aspect above.

[0053] The present application provides a vehicle drive axle protection method and a vehicle. The method of the present application is applied to a vehicle that uses a high-horsepower engine to replace a low-horsepower engine. Specifically, the method of the present application obtains the current gear position and vehicle operation information through a vehicle controller. The vehicle controller determines the vehicle operation mode according to the vehicle operation information, and sends the vehicle operation mode and the current gear position to the engine controller. When the engine controller obtains the current gear position and the vehicle operation mode, it determines the current maximum output torque limit of the vehicle according to the current gear position and the vehicle operation mode, and limits the torque of the vehicle with the maximum output torque limit.

[0054] Through the method of the present application, the vehicle will accurately limit torque according to the maximum output torque limit corresponding to the current state when in different gears and different vehicle operating modes, which is beneficial to protecting the life of the drive axle. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0056] Figure 1 A process schematic diagram of a vehicle drive axle protection strategy provided by an embodiment of the present application;

[0057] Figure 2 A vehicle controller structure framework provided in an embodiment of the present application Figure 1 ;

[0058] Figure 3 A vehicle controller structure framework provided in an embodiment of the present application Figure 2 ;

[0059] Figure 4a A schematic diagram of a vehicle drive axle protection method provided in an embodiment of the present application Figure 1 ;

[0060] Figure 4b A process diagram of a vehicle drive axle protection method provided in an embodiment of the present application Figure 1 ;

[0061] Figure 5a A schematic diagram of a vehicle drive axle protection method provided in an embodiment of the present application Figure 2 ;

[0062] Figure 5bA process diagram of a vehicle drive axle protection method provided in an embodiment of the present application Figure 2 ;

[0063] Figure 6 A schematic diagram of a vehicle drive axle protection device provided in an embodiment of the present application Figure 1 ;

[0064] Figure 7 A schematic diagram of a vehicle drive axle protection device provided in an embodiment of the present application Figure 2 ;

[0065] Figure 8 An electronic device is provided in an embodiment of the present application.

[0066] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0067] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0068] In recent years, the domestic logistics industry is booming, and the road logistics sector is the main force in the logistics industry. With the intensification of industry competition and the rise in fuel costs, higher requirements are put forward for the operating costs of commercial vehicles, including the requirements for lightweight and high timeliness of vehicles. The results that can be achieved by this requirement are specifically reflected in: when the vehicle's dead weight is reduced by 0.5t, taking an annual operation of 200,000 kilometers as an example, it can generate an additional income of about 40,000 yuan / year; using a high-horsepower engine to improve the vehicle's operating efficiency and increase the number of operations can generate an additional income of about 25,000 yuan / year.

[0069] It can be seen that high-horsepower and high-lightweight models will become popular models in the current commercial vehicle logistics field. However, high-horsepower engines have strong power and torque, which puts higher requirements on the torsion bearing capacity of the drive axle. Improving the torsion bearing capacity of the drive axle requires strengthening the structure, which is not conducive to achieving vehicle lightweighting.

[0070] The present application provides a vehicle drive axle protection method and a vehicle, which are used to solve the above-mentioned problems. Figure 1 A process diagram of a vehicle drive axle protection strategy provided by an embodiment of the present application is shown as follows: Figure 1As shown, the present application obtains the current gear position and vehicle operation information through the vehicle controller, the vehicle controller determines the vehicle operation mode according to the vehicle operation information, and sends the current gear position and vehicle operation information to the engine controller. After obtaining the current gear position and vehicle operation mode, the engine controller determines the maximum output torque limit according to the current gear position and vehicle operation mode, and performs torque limitation according to the maximum output torque limit.

[0071] Through the method of the present application, the vehicle uses different torque limiting strategies for different gears and different vehicle operating modes, and accurately limits the torque of the vehicle in each state, which is beneficial to protecting the life of the drive axle.

[0072] In the following, some embodiments of the present application are described in detail in conjunction with the accompanying drawings. In the case where the embodiments do not conflict with each other, the following embodiments and features in the embodiments can be combined with each other.

[0073] Figure 2 A vehicle controller structure framework provided in an embodiment of the present application Figure 1 ,like Figure 2 As shown, the vehicle of the present application includes a vehicle controller 10 and an engine controller 20, and the vehicle controller 10 is communicatively connected with the engine controller 20. In this embodiment, the specific connection method between the vehicle controller 10 and the engine controller 20 is not limited, as long as communication can be achieved.

[0074] In this embodiment, the vehicle controller 10 is used to obtain the current gear position and vehicle operation information, determine the vehicle operation mode according to the vehicle operation information, and send the current gear position and vehicle operation information to the engine controller 20.

[0075] Among them, the vehicle operation information includes the gear position of the transmission, the slope of the vehicle, the throttle opening of the vehicle, the wheel slip signal of the ABS / EBS system, and the differential lock signal.

[0076] Optionally, the vehicle controller 10 can obtain the above vehicle operation information through sensors connected to it in communication, or through other controllers connected to it in communication. The present embodiment does not limit the method for obtaining the vehicle operation information. Similarly, the vehicle controller 10 can obtain the current gear position through sensors connected to it in communication, or through controllers connected to it in communication.

[0077] It is understandable that the vehicle controller 10 determines that the vehicle operation mode is the power mode when the gearbox is in the S mode, or when the slope of the vehicle is greater than the preset slope threshold, or when the throttle opening of the vehicle is greater than the preset throttle opening threshold. The vehicle controller 10 determines that the vehicle is in the strong torque limit mode when the differential lock signal indicates that the vehicle differential lock is in the enabled state, or when the ABS / EBS system wheel side slip signal indicates that the vehicle is in the slipping state. If none of the above situations occurs, the vehicle is determined to be in the normal mode.

[0078] In this embodiment, the engine controller 20 is used to obtain the current gear position and the vehicle operating mode, determine the maximum output torque limit according to the current gear position and the vehicle operating mode, and limit the torque of the vehicle at the maximum output torque limit.

[0079] It can be understood that, in this embodiment, different maximum output torque limits are provided for different gears and different vehicle operating modes.

[0080] Among them, the method for determining the maximum output torque limit value under different gears and different vehicle operating modes is detailed in the following method embodiment. Optionally, in actual application, in addition to the method of the following embodiment, it is also possible to conduct multiple experiments on different gears and different vehicle operating modes to obtain the maximum output torque limit values ​​corresponding to each state, form a table and input it into the engine controller 20. Based on this, after obtaining the current gear and vehicle operating mode, the engine controller 20 feeds back the maximum output torque limit value of the current state by looking up the table, and limits the torque of the vehicle at this time based on the maximum output torque limit value. In this embodiment, the method for determining the maximum output torque limit value is not limited, as long as the life of the drive axle can be protected in the end.

[0081] Exemplarily, the engine controller 20 obtains the maximum output torque limit of the vehicle by looking up a table. The vehicle controller 10 obtains the vehicle operation information such as the gearbox gear, the slope of the vehicle, the throttle opening of the vehicle, the wheel slip signal of the ABS / EBS system, and the differential lock signal through controllers respectively used to obtain the gearbox gear, the slope of the vehicle, the throttle opening of the vehicle, the wheel slip signal of the ABS / EBS system, and the differential lock signal. Through the vehicle operation information, it is known that the gearbox gear is not in S mode, the slope of the vehicle is not greater than the preset slope threshold, the throttle opening of the vehicle is not greater than the preset throttle opening threshold, the differential lock signal indicates that the vehicle differential lock is not in an enabled state, and the wheel slip signal of the ABS / EBS system indicates that the vehicle is not in a slipping state. Therefore, the vehicle controller 10 determines that the vehicle is in normal mode. At this time, if the current gear is 2nd gear, the engine controller 20 queries the table for the maximum output torque limit corresponding to the current gear being 2nd gear and the vehicle operation mode being normal mode, and limits the torque of the current vehicle according to the maximum output torque limit.

[0082] The vehicle provided in this embodiment has a vehicle controller 10 and an engine controller 20 that cooperate with each other to achieve accurate graded torque limiting for the vehicle, which is beneficial to protecting the life of the drive axle.

[0083] Figure 3 A vehicle controller structure frame provided in an embodiment of the present application Figure 2 Based on the above embodiment, this embodiment limits the way in which the vehicle controller 10 obtains the vehicle operation information. Specifically, Figure 3 As shown, the vehicle of this embodiment further includes a differential lock controller 30, a vehicle speed sensor 40, a gearbox controller 50, a slope sensor 60, and an EBS / ABS controller 70 that are communicatively connected to the vehicle controller 10. In this embodiment, the connection method between the above controllers or sensors and the vehicle controller 10 is not limited.

[0084] In this embodiment, the differential lock controller 30 is used to monitor whether the vehicle differential lock is in an enabled state to obtain a differential lock signal, and send the differential lock signal to the vehicle controller 10. The vehicle speed sensor 40 is used to monitor the vehicle throttle opening, and send the vehicle throttle opening to the vehicle controller 10. The gearbox controller 50 is used to monitor the gearbox gear position, and send the gearbox gear position to the vehicle controller 10. The slope sensor 60 is used to monitor the slope of the vehicle, and send the slope of the vehicle to the vehicle controller 10. The EBS / ABS controller 70 is used to monitor the wheel slip signal of the ABS / EBS system, and send the wheel slip signal of the ABS / EBS system to the vehicle controller 10.

[0085] Specifically, in this embodiment, when the differential lock is in the enabled state, it is marked with 1, and when the differential lock is not in the enabled state, it is marked with 0. The differential lock controller 30 sends 0 or 1 to the vehicle controller 10 to inform the vehicle controller 10 of the state of the differential lock. When the vehicle is in a slipping state, it is marked with 1, and when the vehicle is not in a slipping state, it is marked with 0. The EBS / ABS controller 70 sends 0 or 1 to the vehicle controller 10 to inform the vehicle controller 10 whether the vehicle is in a slipping state.

[0086] It is understandable that the vehicle speed sensor 40 and the slope sensor 60 send specific values ​​to the vehicle controller 10. The vehicle controller 10 is provided with a preset throttle opening threshold and a preset slope threshold. The vehicle controller 10 compares the vehicle throttle opening sent by the vehicle speed sensor 40 with the preset throttle opening threshold, and compares the vehicle slope sent by the slope sensor 60 with the preset slope threshold. The transmission gear positions monitored by the transmission controller 50 include P mode, R mode, N mode, D mode and S mode. When the transmission controller 50 detects that the transmission gear position is in S mode, it sends S to the vehicle controller 10 so that the vehicle controller 10 knows that the current transmission gear position is in S mode.

[0087] Exemplarily, if the differential lock controller 30 sends 1 to the vehicle controller 10, the vehicle controller 10 determines that the differential lock is in an enabled state. If the preset slope threshold in the vehicle controller 10 is 5, then when the value sent by the slope sensor 60 to the vehicle controller 10 is 4, the vehicle controller 10 determines that the slope of the vehicle is not greater than the preset slope threshold.

[0088] Figure 4a A schematic diagram of a drive axle protection method provided in an embodiment of the present application Figure 1 , the method provided in this embodiment is executed by the vehicle controller. Figure 4a As shown, the method provided in this embodiment includes:

[0089] S401a, obtaining current gear position and vehicle operation information.

[0090] Among them, the vehicle operation information includes the gear position of the transmission, the slope of the vehicle, the throttle opening of the vehicle, the wheel slip signal of the ABS / EBS system, and the differential lock signal.

[0091] Specifically, in this embodiment, the current gear position is obtained through the gear controller, the transmission gear position is obtained through the transmission controller, the slope of the vehicle is obtained through the slope sensor, the throttle opening of the vehicle is obtained through the vehicle speed sensor, the wheel slip signal of the ABS / EBS system is obtained through the EBS / ABS controller, and the differential lock signal is obtained through the differential controller.

[0092] S402a, determining the vehicle operation mode according to the vehicle operation information.

[0093] Among them, the vehicle operation mode is one of the power mode, normal mode, and strong torque limit mode.

[0094] Referring to the above embodiment, the vehicle controller determines that the vehicle operation mode is the power mode when the gearbox is in the S mode, or when the slope of the vehicle is greater than the preset slope threshold, or when the throttle opening of the vehicle is greater than the preset throttle opening threshold. The vehicle controller determines that the vehicle is in the strong torque limit mode when the differential lock signal indicates that the vehicle differential lock is in the enabled state, or when the wheel slip signal of the ABS / EBS system indicates that the vehicle is in the slipping state. If none of the above situations occurs, the vehicle is determined to be in the normal mode.

[0095] S403a, sending the current gear position and the vehicle operating mode to the engine controller, so that the engine controller limits the torque of the vehicle according to the current gear position and the vehicle operating mode.

[0096] Specifically, after obtaining the vehicle operating mode, the vehicle controller transmits the current gear position and the vehicle operating mode to the engine controller, so that the engine controller limits the torque of the current vehicle according to the current gear position and the vehicle operating mode.

[0097] It is understandable that the engine controller can determine the maximum output torque limit of the current vehicle according to the current gear position and the vehicle operation mode, and the engine controller limits the torque of the current vehicle according to the maximum output torque limit. In this embodiment, the engine controller is pre-set with a corresponding table of maximum output torque limits for the current gear position and different vehicle operation modes, and the corresponding table is obtained through multiple experiments. When the engine controller receives the current gear position and the vehicle operation mode, it obtains the corresponding maximum output torque limit by searching the corresponding table.

[0098] Figure 4b This is a process diagram of a vehicle drive axle protection method provided by an embodiment of the present application. The method provided by this embodiment is executed by a vehicle controller. Specifically, this embodiment describes in detail a specific method for the vehicle controller to determine the vehicle operation mode according to the vehicle operation information. Figure 4b As shown, the method provided in this embodiment includes:

[0099] S401b, obtaining current gear position and vehicle operation information.

[0100] Among them, the vehicle operation information includes the gear position of the transmission, the slope of the vehicle, the throttle opening of the vehicle, the wheel slip signal of the ABS / EBS system, and the differential lock signal.

[0101] Specifically, the method for obtaining the current gear position and vehicle operation information can refer to the definition of S401a in the above embodiment, which will not be repeated here.

[0102] S402b, determine whether the vehicle operation information meets at least one of the first preset conditions, if so, execute S403b; otherwise, execute S404b.

[0103] Among them, the first preset condition includes: the vehicle throttle opening is greater than a preset throttle opening threshold, the transmission gear is in S mode, and the vehicle's slope is greater than a preset slope threshold.

[0104] It can be understood that a preset throttle opening threshold and a preset slope threshold are pre-stored in the vehicle controller. After obtaining the vehicle throttle opening sent by the vehicle speed sensor and the vehicle slope sent by the slope sensor, the vehicle controller compares the vehicle throttle opening with the preset throttle opening threshold, and compares the vehicle slope with the preset slope threshold to determine whether the vehicle operation information meets at least one of the first preset conditions.

[0105] S403b, determining that the vehicle operation mode is a power mode.

[0106] It can be understood that it is known that the vehicle controller determines that the vehicle operating mode is the power mode when the transmission gear is in S mode, or when the vehicle is on a slope greater than a preset slope threshold, or when the vehicle throttle opening is greater than a preset throttle opening threshold. Therefore, as long as at least one of the first preset conditions is met, the vehicle operating mode is determined to be the power mode.

[0107] S404b, determine whether the vehicle operation information meets at least one of the second preset conditions, if so, execute S405b, otherwise, execute S408b.

[0108] Specifically, if the vehicle operation information does not satisfy any one of the first preset conditions, the vehicle controller continues to determine whether the vehicle operation information satisfies at least one of the second preset conditions.

[0109] The second preset condition includes: a differential lock signal indicating that the vehicle differential lock is in an enabled state, and an ABS / EBS system wheel slip signal indicating that the vehicle is in a slipping state.

[0110] S405b, determining whether the differential lock signal indicates that the vehicle differential lock is in an enabled state, if so, executing S406b, otherwise, executing S407b.

[0111] S406b, determining that the vehicle operation mode is the first strong torque limitation mode.

[0112] S407b, determining that the vehicle operation mode is the second strong torque limit mode.

[0113] Specifically, when the vehicle operation information satisfies at least one of the second preset conditions, the vehicle operation mode is determined to be a torque strong limitation mode. The torque strong limitation mode includes a first torque strong limitation mode and a second torque strong limitation mode. When the differential lock signal in the vehicle operation information indicates that the vehicle differential lock is in an enabled state, the vehicle operation mode is the first strong torque limitation mode. When the ABS / EBS system wheel side slip signal in the vehicle operation information indicates that the vehicle is in a slipping state, the vehicle operation mode is the second strong torque limitation mode.

[0114] It is understandable that the first strong torque limiting mode and the second strong torque limiting mode should adopt different torque limiting strategies. For the first strong torque limiting mode, torque limiting control is required according to the state of the inter-wheel differential lock and the inter-axle differential lock of the vehicle, with the goal of reducing damage to the half-axle. For the second strong torque limiting mode, torque limiting control is performed according to the slipping state of the vehicle, with the goal of stopping the vehicle from slipping as soon as possible.

[0115] Optionally, if the vehicle operation information satisfies any one of the second preset conditions, the vehicle operation mode is determined to be the third torque strong limitation mode.

[0116] S408b, determining that the vehicle operation mode is a normal mode.

[0117] Specifically, if the vehicle operation information does not meet the third preset condition, the vehicle operation mode is determined to be the normal mode. The third preset condition includes the first preset condition and the second preset condition.

[0118] It can be understood that when the vehicle operation information satisfies neither any one of the first preset conditions nor any one of the second preset conditions, the vehicle operation mode is the normal mode.

[0119] In the method provided in this embodiment, after the vehicle controller obtains the vehicle operation information, it sequentially determines whether the vehicle operation information satisfies any one of the first preset conditions, whether it satisfies any one of the second preset conditions, and which one of the second preset conditions is satisfied, so as to sequentially determine whether the current vehicle operation mode is the power mode, the strong torque limit mode, the first strong torque limit mode, the second strong torque limit mode, and the normal mode. The method of this embodiment has clear logic and is simple, which is conducive to the rapid response of the vehicle controller.

[0120] Optionally, in actual applications, it is also possible to determine in turn whether the vehicle operation information satisfies at least one of the second preset conditions and whether it satisfies any one of the first preset conditions to determine the current vehicle operation mode. That is, in this embodiment, the execution order of S402b and S404b is not adjusted. After adjusting the execution order of S402b and S404b, the order of the remaining steps is adjusted accordingly.

[0121] Figure 5a A schematic diagram of a drive axle protection method provided in an embodiment of the present application Figure 2 , the method provided in this embodiment is executed by the engine controller. Figure 5a As shown, the method provided in this embodiment includes:

[0122] S501a, obtaining the current gear position and vehicle operation mode of the vehicle.

[0123] Among them, the current gear position and vehicle operation mode are obtained through the vehicle controller in the above embodiment, and the vehicle operation mode includes one of a power mode, a normal mode, and a torque strong limitation mode.

[0124] S502a, determining a maximum output torque limit value according to the current gear position and the vehicle operation mode, and limiting the torque of the vehicle at the maximum output torque limit value.

[0125] In this embodiment, the specific manner in which the engine controller determines the maximum output torque limit value according to the current gear position and the vehicle operating mode is not limited.

[0126] In the method provided in this embodiment, the engine controller obtains the current gear position and vehicle operating mode through the vehicle controller, determines the maximum output torque limit in the current state according to the different current gear positions and vehicle operating modes of the current vehicle, and limits the torque of the vehicle with the maximum output torque limit, thereby realizing graded torque limiting of the vehicle, which is beneficial to protecting the life of the drive axle.

[0127] Figure 5b A process diagram of a drive axle protection method provided in an embodiment of the present application Figure 2 Specifically, this embodiment defines the method for determining the maximum output torque limit value based on the above embodiment. Figure 5b , further limiting the embodiments of the present application. Figure 5b As shown, this embodiment includes the following contents:

[0128] S501b, obtaining the current gear position and vehicle operation mode of the vehicle.

[0129] Among them, the limitations on the current gear position and vehicle operating mode can be found in the description in S501a, which will not be repeated here.

[0130] S502b, determine whether the vehicle operation mode is the power mode, if so, execute S503b, otherwise, execute S504b.

[0131] S503b: Use the smaller one of the first torque and the maximum torque value of the high-horsepower engine as the maximum output torque limit value.

[0132] Among them, the first torque is the maximum output torque limit calculated based on the rated torque of the drive axle and the current gear. The first torque is also related to the vehicle's gearbox ratio, drive axle ratio, gearbox comprehensive transmission efficiency and drive axle.

[0133] Specifically, T P , n represents the first torque, then Among them, n is used to represent the current gear, A n It is used to indicate the transmission ratio of the nth gear, B is used to indicate the drive axle ratio, μ n Used to indicate the comprehensive transmission efficiency of the nth gearbox, μ 驱动桥 Used to indicate the comprehensive dynamic efficiency of the drive axle, T 驱动桥 Used to indicate the rated torque of the drive axle.

[0134] It is understandable that after n is determined, A n , μ n are all known quantities. After the drive axle model is determined, μ 驱动桥 , T 驱动桥 Therefore, the first torque can be calculated based on each known quantity.

[0135] Furthermore, the smaller one of the first torque and the maximum torque value of the high-horsepower engine is used as the maximum output torque limit value in the n gear and the power mode.

[0136] For example, if the maximum torque limit of a high-horsepower engine is 2700 Nm, T 驱动桥 When n is 1, A1 is 13.1, μ1 is 95.7%, B is 3.36, μ 驱动桥 is 96.8%. Then it can be calculated that T P , 1 is 2452.5Nm, which is less than the maximum torque value of the high-horsepower engine. Therefore, when the current gear is 1st gear and the vehicle operating mode is power mode, the maximum output torque limit is 2452.5Nm.

[0137] It is understandable that as the current gear is upgraded, the gearbox ratio decreases, resulting in T P , n The torque will also increase with the increase of the current gear. Therefore, in the power mode, the engine controller only limits the torque of the low gear.

[0138] S504b, determine whether the vehicle operation mode is a torque strong limit mode, if so, execute S505b, otherwise execute S508b.

[0139] S505b, determining whether the vehicle operation mode is the first torque strong limiting mode, if so, executing S506b, otherwise executing S507b.

[0140] Specifically, since the engine controller has different torque limiting strategies for the first strong torque limiting mode and the second strong torque limiting mode, the engine controller further determines whether it is the first strong torque limiting mode or the second strong torque limiting mode when the vehicle operation mode is the strong torque limiting mode.

[0141] S506b: Calculate the maximum output torque limit value in the first torque strong limit mode according to the preset limit coefficient and the maximum output torque limit value of the current gear in the power mode.

[0142] Specifically, T Sn represents the maximum output torque limit in the nth gear and the first strong torque limit mode, then T Sn =α·T Pn , where T Pn is the maximum output torque limit at the nth gear in the power mode, and α is the limit coefficient.

[0143] Among them, α is determined by the inter-wheel differential lock and the inter-axle differential lock. In this embodiment, the engine controller is preset with the limiting coefficient when the inter-wheel differential lock acts alone, the limiting coefficient when the inter-axle differential lock acts alone, and the limiting coefficient when the inter-wheel differential lock and the inter-axle differential lock act simultaneously, and the above limiting coefficients are designed based on experience. During the operation of the vehicle, the engine controller calls the corresponding limiting coefficients according to the states of the inter-wheel differential lock and the inter-axle differential lock to calculate T Sn .

[0144] S507b, performing step-by-step torque limiting on the current torque value according to preset rules, and using the torque when the wheel slip signal of the ABS / EBS system indicates that the vehicle changes from a slipping state to a non-slipping state as the maximum output torque limit value in the second torque strong limiting mode.

[0145] The preset rule is to implement a 5% step torque limit based on the current torque value until it is detected that the slipping state is changed to a non-slipping state.

[0146] Optionally, if the engine controller receives that the vehicle operation mode is the third torque strong limitation mode, its processing logic can refer to the definition of S503b, which will not be repeated here.

[0147] S508b, determine whether the current gear position is not greater than the first threshold, if so, execute S509b, otherwise execute S510b.

[0148] S509b: Determine the maximum output torque limit according to the first formula.

[0149] The first threshold is preset in the engine controller. The first formula is:

[0150]

[0151] In the formula, n is used to represent the current gear position, T Nn It is used to indicate the maximum output torque limit in normal mode and at gear n, T 小马力 is the maximum torque value of a small horsepower engine, t i大马力 is the target torque response time of the i-th point at the maximum torque speed point of the high-horsepower engine, a is the statistical point number of the maximum torque speed point of the high-horsepower engine, t i小马力 is the target torque response time of the i-th point of the maximum torque speed point of the small horsepower engine, and b is the statistical point number of the maximum torque speed point of the small horsepower engine.

[0152] It can be understood that after the high-horsepower engine and the low-horsepower engine are determined, the parameters in the above formula are all known quantities. Therefore, T can be directly calculated based on the above formula. Nn .

[0153] S510b, determine whether the current gear is not less than the second threshold, if so, execute S511b, otherwise, execute S512b.

[0154] The second threshold is greater than the first threshold. Exemplarily, the first threshold is the 2nd gear and the second threshold is the 4th gear.

[0155] S511b, the maximum torque limit of the high horsepower engine is used as the maximum output torque limit.

[0156] S512b: Perform a linear correction based on the maximum output torque limit value at the first threshold and the maximum output torque limit value at the second threshold to obtain the maximum output torque limit value at the current gear.

[0157] For example, if the first threshold is 4 gears and the second threshold is 6 gears, T 大马力 The maximum torque points of the high-horsepower engine are 1000rpm, 1100rpm, 1200rpm, 1300rpm, and 1400rpm. a is 5, and the response time of the target torque of 2200Nm at the five speed points is 2.5s, 2.2s, 2.1s, 2.0s, and 2.1s. 小马力 It is 2200Nm. The maximum torque points of the small horsepower engine are 1000rpm, 1100rpm, 1200rpm, 1300rpm and 1400rpm. b is 5, and the target torque response time of 2200Nm at the five speed points is 2.8s, 2.4s, 2.3s, 2.1s and 2.2s respectively.

[0158] It can be understood that for gears 1, 2, 3, and 4, according to the first formula, the maximum output torque limit is determined to be 2032.2 Nm, and the specific calculation process is as follows:

[0159]

[0160] Furthermore, when the current gear is greater than or equal to 6th gear, T N(6-16) =T 大马力 =2700Nm.

[0161] Furthermore, when the vehicle gear is equal to 5th gear, linear correction is used to obtain

[0162] The method provided in this embodiment has different control strategies for each vehicle operation mode and current gear. After determining the vehicle operation mode and current gear, the engine controller calls the corresponding control logic to calculate the maximum output torque limit under the current vehicle operation mode and current gear, and limits the torque of the vehicle based on the corresponding calculation results.

[0163] The method of this embodiment fully considers the characteristics of the vehicle in different vehicle operating modes and different gears, and sets different torque limiting strategies, thereby accurately realizing the graded torque limiting of the vehicle, which is further beneficial to protecting the life of the drive axle.

[0164] The above-mentioned embodiment introduces a vehicle drive axle protection method from the perspective of method flow, and the following embodiment introduces a vehicle drive axle protection device from the perspective of a virtual module or a virtual unit. Please refer to the following embodiment for details.

[0165] The present application embodiment provides a vehicle drive axle protection device, such as Figure 6 As shown, the device includes a first acquisition module 61 and a torque limiting module 62, wherein:

[0166] A first acquisition module 61 is used to acquire the current gear position and vehicle operation mode of the vehicle, the current gear position and vehicle operation mode are obtained through the vehicle controller, and the vehicle operation mode is one of a power mode, a normal mode, and a torque strong limit mode;

[0167] The torque limiting module 62 is used to determine the maximum output torque limit value according to the current gear position and the vehicle operation mode, and to limit the torque of the vehicle at the maximum output torque limit value.

[0168] In another possible implementation of the embodiment of the present application, the torque limiting module 62 is specifically used for:

[0169] When the vehicle operation mode is the power mode, the smaller one of the first torque and the maximum torque value of the high-horsepower engine is used as the maximum output torque limit; the first torque is the maximum output torque limit calculated based on the rated torque of the drive axle and the current gear, and the first torque is also related to the vehicle's gearbox speed ratio, drive axle speed ratio, gearbox comprehensive transmission efficiency and drive axle;

[0170] When the vehicle operating mode is the power mode, the vehicle satisfies at least one of the following conditions: the vehicle throttle opening is greater than a preset throttle opening threshold, the transmission gear is in P mode, and the vehicle slope is greater than a preset slope threshold.

[0171] In another possible implementation manner of the embodiment of the present application, the torque limiting module 62 is specifically used for:

[0172] The torque strong limiting mode includes a first torque strong limiting mode and a second torque strong limiting mode;

[0173] When the vehicle operation mode is the first torque strong limiting mode, the vehicle's differential lock signal indicates that the vehicle's differential lock is in an enabled state; when the vehicle operation mode is the second torque strong limiting mode, the vehicle's ABS / EBS system wheel side slip signal indicates that the vehicle is in a slipping state;

[0174] If the vehicle operation mode is the first torque strong limiting mode, the maximum output torque limit value in the first torque strong limiting mode is calculated according to the preset limit coefficient and the maximum output torque limit value of the current gear in the power mode; the preset limit coefficient is determined by the inter-wheel differential lock and the inter-axle differential lock;

[0175] If the vehicle operating mode is the second torque strong limitation mode, the current torque value is limited in steps according to the preset rules, and the torque when the ABS / EBS system wheel slip signal indicates that the vehicle changes from a slipping state to a non-slipping state is used as the maximum output torque limit value in the second torque strong limitation mode.

[0176] In another possible implementation of the embodiment of the present application, the torque limiting module 62 is specifically used for:

[0177] When the vehicle operation mode is the normal mode, if the current gear position is not greater than the first threshold, the maximum output torque limit is determined according to the first formula; the first formula is:

[0178]

[0179] Among them, n is used to represent the current gear, T Nn It is used to indicate the maximum output torque limit in normal mode and at gear n, T 小马力 is the maximum torque value of a small horsepower engine, t i大马力 is the target torque response time of the i-th point at the maximum torque speed point of the high-horsepower engine, a is the statistical point number of the maximum torque speed point of the high-horsepower engine, t i小马力 is the target torque response time of the i-th point at the maximum torque speed point of the small horsepower engine, and b is the statistical point number of the maximum torque speed point of the small horsepower engine;

[0180] If the current gear is not less than the second threshold, the maximum torque limit of the high-horsepower engine is used as the maximum output torque limit; the second threshold is greater than the first threshold;

[0181] If the current gear is greater than the first threshold and less than the second threshold, a linear correction is performed based on the maximum output torque limit at the first threshold and the maximum output torque limit at the second threshold to obtain the maximum output torque limit at the current gear.

[0182] The present application embodiment provides a vehicle drive axle protection device, such as Figure 7 As shown, the device includes a second acquisition module 71, a determination module 72 and a sending module 73, wherein:

[0183] The second acquisition module 71 is used to acquire the current gear position and vehicle operation information, wherein the vehicle operation information includes the gear position of the transmission, the slope of the vehicle, the throttle opening of the vehicle, the wheel slip signal of the ABS / EBS system, and the differential lock signal;

[0184] The determination module 72 is used to determine the vehicle operation mode according to the vehicle operation information; the vehicle operation mode is one of the power mode, the normal mode, and the strong torque limit mode;

[0185] The sending module 73 is used to send the current gear position and the vehicle operation mode to the engine controller, so that the engine controller limits the torque of the vehicle according to the current gear position and the vehicle operation mode.

[0186] In another possible implementation of the embodiment of the present application, the determination module 72 is specifically configured to:

[0187] If the vehicle operation information satisfies at least one of the first preset conditions, the vehicle operation mode is determined to be the power mode; the first preset condition includes: the vehicle throttle opening is greater than a preset throttle opening threshold, the gearbox gear is in S mode, and the vehicle slope is greater than a preset slope threshold;

[0188] If the vehicle operation information does not satisfy any one of the first preset conditions and satisfies at least one of the second preset conditions, it is determined that the vehicle operation mode is the strong torque limit mode, and the second preset condition is: the differential lock signal indicates that the vehicle differential lock is in an enabled state; the ABS / EBS system wheel side slip signal indicates that the vehicle is in a slipping state;

[0189] If the vehicle operation information does not meet the third preset condition, the vehicle operation mode is determined to be the normal mode, and the third preset condition includes the first preset condition and the second preset condition.

[0190] In another possible implementation of the embodiment of the present application, the determination module 72 is specifically configured to:

[0191] The strong torque limiting mode includes a first strong torque limiting mode and a second strong torque limiting mode;

[0192] If the differential lock signal indicates that the vehicle differential lock is in an enabled state, determining that the vehicle operating mode is a first strong torque limiting mode;

[0193] If the wheel slip signal of the ABS / EBS system indicates that the vehicle is in a slipping state, the vehicle operation mode is determined to be the second strong torque limiting mode.

[0194] A vehicle drive axle protection device provided in an embodiment of the present application is applicable to the above method embodiment and will not be described in detail here.

[0195] An electronic device is provided in an embodiment of the present application, such as Figure 8 As shown, Figure 8 The electronic device shown includes: a processor 81 and a memory 82. The processor 81 and the memory 82 are connected, such as through a bus 83. Optionally, the electronic device may further include a transceiver 84. It should be noted that in actual applications, the transceiver 84 is not limited to one, and the structure of the electronic device does not constitute a limitation on the embodiments of the present application.

[0196] The processor 81 may be a central processing unit 81 (CPU), a general processor 81, a digital signal processor 81 (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It may implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. The processor 81 may also be a combination that implements computing functions, such as a combination of one or more microprocessors 81, a combination of a DSP and a microprocessor 81, etc.

[0197] The bus 83 may include a path to transmit information between the above components. The bus 83 may be a Peripheral Component Interconnect (PCI) bus 83 or an Extended Industry Standard Architecture (EISA) bus 83, etc. The bus 83 may be divided into an address bus 83, a data bus 83, a control bus 83, etc. For ease of representation, Figure 8Only one thick line is used in the figure, but it does not mean that there is only one bus 83 or only one type of bus 83.

[0198] The memory 82 can be a read-only memory 82 (ROM) or other types of static storage devices that can store static information and instructions, a random access memory 82 (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory 82 (EEPROM), a compact disc (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited to these.

[0199] The memory 82 is used to store the application code for executing the solution of the present application, and the execution is controlled by the processor 81. The processor 81 is used to execute the application code stored in the memory 82 to implement the contents shown in the above method embodiment.

[0200] The present application also provides a computer-readable storage medium, which may include: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media that can store program codes. Specifically, the computer-readable storage medium stores program instructions, and the program instructions are used to implement the methods in the above-mentioned embodiments.

[0201] A computer program product is also provided in an embodiment of the present application, including a computer program. When the computer program is executed by a processor, the technical solution of the above-mentioned method embodiment is implemented. The implementation principle and technical effect are similar and will not be repeated here.

[0202] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the claims.

[0203] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A vehicle drive axle protection method, characterized in that: Applied to a vehicle that uses a high-horsepower engine to replace a low-horsepower engine, the method is executed by an engine controller and includes: Acquire a current gear position and a vehicle operation mode of the vehicle, wherein the current gear position and the vehicle operation mode are obtained by a vehicle controller, and the vehicle operation mode is one of a power mode, a normal mode, and a torque strong limit mode; Determining a maximum output torque limit value according to the current gear position and the vehicle operation mode, and limiting the torque of the vehicle at the maximum output torque limit value; If the vehicle operation mode is the normal mode, determining the maximum output torque limit value according to the current gear position and the vehicle operation mode includes: When the current gear position is not greater than a first threshold, the maximum output torque limit is determined according to a first formula; the first formula is: in, Used to indicate the current gear position, It is used to indicate the maximum output torque limit in the normal mode and the nth gear. is the maximum torque value of the small horsepower engine, is the target torque response time of the i-th point of the maximum torque speed point of the high-horsepower engine, a is the statistical point number of the maximum torque speed point of the high-horsepower engine, is the target torque response time of the i-th point of the maximum torque speed point of the small horsepower engine, and b is the statistical number of the maximum torque speed point of the small horsepower engine; When the current gear is not less than a second threshold, the maximum torque limit of the high horsepower engine is used as the maximum output torque limit; the second threshold is greater than the first threshold; When the current gear is greater than the first threshold and less than the second threshold, a linear correction is performed according to the maximum output torque limit at the first threshold and the maximum torque output limit at the second threshold to obtain the maximum output torque limit at the current gear.

2. The method according to claim 1, characterized in that If the vehicle operation mode is the power mode, determining the maximum output torque limit value according to the current gear position and the vehicle operation mode includes: The smaller one of the first torque and the maximum torque value of the high-horsepower engine is used as the maximum output torque limit; the first torque is the maximum output torque limit calculated based on the rated torque of the drive axle and the current gear, and the first torque is also related to the vehicle's gearbox ratio, drive axle ratio, gearbox comprehensive transmission efficiency and drive axle.

3. The method according to claim 2, characterized in that The torque strong limiting mode includes a first torque strong limiting mode and a second torque strong limiting mode, and the determining of the maximum output torque limit value according to the current gear position and the vehicle operation mode includes: When the vehicle operation mode is the first strong torque limiting mode, the differential lock signal of the vehicle indicates that the vehicle differential lock is in an enabled state; when the vehicle operation mode is the second strong torque limiting mode, the wheel slip signal of the ABS / EBS system of the vehicle indicates that the vehicle is in a slipping state; If the vehicle operation mode is the first torque strong limiting mode, the maximum output torque limit value in the first torque strong limiting mode is calculated according to a preset limit coefficient and the maximum output torque limit value of the current gear in the power mode; the preset limit coefficient is determined by the inter-wheel differential lock and the inter-axle differential lock; If the vehicle operation mode is the second torque strong limitation mode, the current torque value is step-limited according to preset rules, and the torque when the ABS / EBS system wheel slip signal indicates that the vehicle changes from a slipping state to a non-slipping state is used as the maximum output torque limit value in the second torque strong limitation mode.

4. A vehicle drive axle protection method, characterized in that: Applied to a vehicle that uses a high-horsepower engine to replace a low-horsepower engine, the method is executed by a vehicle controller and includes: Obtaining the current gear position and vehicle operation information, wherein the vehicle operation information includes the gear position of the transmission, the slope of the vehicle, the throttle opening of the vehicle, the wheel slip signal of the ABS / EBS system, and the differential lock signal; Determining a vehicle operation mode according to the vehicle operation information; the vehicle operation mode is one of a power mode, a normal mode, and a strong torque limit mode; Sending the current gear position and the vehicle operation mode to an engine controller, so that the engine controller determines a maximum output torque limit value according to the current gear position and the vehicle operation mode, and performs torque limitation on the vehicle with the maximum output torque limit value; If the vehicle operation mode is the normal mode, the engine controller determines the maximum output torque limit value according to the current gear position and the vehicle operation mode, including: When the current gear position is not greater than a first threshold, the maximum output torque limit is determined according to a first formula; the first formula is: Wherein, n is used to represent the current gear position, It is used to indicate the maximum output torque limit in the normal mode and the nth gear. is the maximum torque value of the small horsepower engine, is the target torque response time of the i-th point of the maximum torque speed point of the high-horsepower engine, a is the statistical point number of the maximum torque speed point of the high-horsepower engine, is the target torque response time of the i-th point of the maximum torque speed point of the small horsepower engine, and b is the statistical number of the maximum torque speed point of the small horsepower engine; When the current gear is not less than a second threshold, the maximum torque limit of the high horsepower engine is used as the maximum output torque limit; the second threshold is greater than the first threshold; When the current gear is greater than the first threshold and less than the second threshold, a linear correction is performed according to the maximum output torque limit at the first threshold and the maximum torque output limit at the second threshold to obtain the maximum output torque limit at the current gear.

5. The method according to claim 4, characterized in that The determining the vehicle operation mode according to the vehicle operation information includes: If the vehicle operation information satisfies at least one of the first preset conditions, the vehicle operation mode is determined to be the power mode; the first preset condition includes: the vehicle throttle opening is greater than a preset throttle opening threshold, the gearbox gear is in S mode, and the vehicle slope is greater than a preset slope threshold; If the vehicle operation information does not satisfy any one of the first preset conditions and satisfies at least one of the second preset conditions, it is determined that the vehicle operation mode is the strong torque limit mode, and the second preset condition is: the differential lock signal indicates that the vehicle differential lock is in an enabled state; the ABS / EBS system wheel slip signal indicates that the vehicle is in a slipping state; If the vehicle operation information does not meet a third preset condition, the vehicle operation mode is determined to be the normal mode, and the third preset condition includes a first preset condition and a second preset condition.

6. The method according to claim 5, characterized in that The strong torque limiting mode includes a first strong torque limiting mode and a second strong torque limiting mode, and determining that the vehicle operation mode is the strong torque limiting mode includes: If the differential lock signal indicates that the vehicle differential lock is in an enabled state, determining that the vehicle operating mode is the first strong torque limiting mode; If the wheel slip signal of the ABS / EBS system indicates that the vehicle is in a slipping state, the vehicle operation mode is determined to be the second strong torque limiting mode.

7. A vehicle, characterized in that: The vehicle includes an engine controller and a vehicle controller, wherein: The vehicle controller is used to obtain the current gear position and vehicle operation information, determine the vehicle operation mode according to the vehicle operation information, and send the current gear position and the vehicle operation mode to the engine controller; the vehicle operation information includes the gear position of the transmission, the road slope, the throttle opening, the wheel slip signal of the ABS / EBS system, and the differential lock signal; the vehicle controller is connected to the engine controller, and the vehicle operation mode is one of the power mode, the normal mode, and the torque strong limit mode; the vehicle controller is also used to execute the method according to any one of claims 4 to 6; The engine controller is a controller for a high-horsepower engine, which is used to obtain the current gear position and the vehicle operating mode, determine the maximum output torque limit based on the current gear position and the vehicle operating mode, and limit the torque of the vehicle with the maximum output torque limit; the engine controller is also used to execute the method described in any one of claims 1-3.

8. The vehicle according to claim 7, characterized in that The vehicle further comprises: a differential lock controller, connected to the vehicle controller, for monitoring whether the vehicle differential lock is in an enabled state, so as to obtain a differential lock signal, and send the differential lock signal to the vehicle controller; A vehicle speed sensor, connected to the vehicle controller, for monitoring the vehicle throttle opening and sending the vehicle throttle opening to the vehicle controller; A gearbox controller, connected to the vehicle controller, for monitoring the gear position of the gearbox, and sending the gear position of the gearbox to the vehicle controller; A slope sensor, connected to the vehicle controller, for monitoring the road slope to obtain the slope of the vehicle, and sending the slope of the vehicle to the vehicle controller; The EBS / ABS controller is connected to the vehicle controller and is used to monitor the wheel slip signal of the ABS / EBS system and send the wheel slip signal of the ABS / EBS system to the vehicle controller.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, they are used to implement the drive axle protection method according to any one of claims 1 to 6.

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