A method, apparatus, device, and medium for controlling engine torque in a vehicle.

Abstract

This invention discloses a method, device, equipment, and medium for controlling engine torque in a vehicle. The method includes, when the rear axle oil temperature exceeds the limit, determining the engine output torque at the time of the over-limit as a first output torque based on the engine speed, transmission gear position, and a pre-stored operating condition table. The method then controls the engine output torque to decrease from the first output torque to a second output torque, and updates the operating condition table using the second output torque as the first output torque. This reduces the engine output torque when the rear axle oil temperature exceeds the limit, thereby lowering the rear axle oil temperature. By updating the operating condition table, the engine output torque is limited to a lower value, keeping the rear axle oil temperature below the second oil temperature threshold. This effectively avoids the risk of thermal damage caused by excessively high rear axle temperatures during vehicle operation.

Description

Technical Field

[0001] This invention relates to the field of vehicle engine torque control, and more particularly to a method, apparatus, device, and medium for controlling vehicle engine torque. Background Technology

[0002] As people's living standards improve, the number of cars on the road is increasing year by year. While cars bring many conveniences to people's lives, they can sometimes become potential killers.

[0003] Vehicle fires are not uncommon due to aging wiring, fuel system leaks, and overheating components, causing cars speeding along the road to suddenly burst into billowing smoke. For rear-wheel drive and four-wheel drive vehicles, the rear axle is closer to the exhaust pipe. As vehicle speed and wind resistance increase, especially under extreme conditions (low speed, high torque, extremely high speed, etc.), the heat generated by the rear axle increases dramatically, and its cooling environment is worse than that of the front axle. Maintaining extreme high-load conditions for extended periods can cause the rear axle to overheat, posing a risk of thermal damage.

[0004] Therefore, there is an urgent need for a solution that can effectively prevent the rear axle temperature from becoming too high during vehicle operation. Summary of the Invention

[0005] This invention provides a method, device, equipment, and medium for controlling the engine torque of a vehicle, in order to solve the problem of excessively high rear axle temperature during vehicle operation in the prior art.

[0006] According to one aspect of the present invention, a method for controlling engine torque in a vehicle is provided, characterized in that, when the rear axle oil temperature exceeds the limit, the output torque of the engine at the time of the excess oil temperature is determined as a first output torque based on the engine speed, transmission gear position, and a pre-stored operating condition table; wherein, when the rear axle oil temperature exceeds the limit, the rear axle oil temperature is greater than or equal to the first oil temperature threshold; and the operating condition table stores the correspondence between the engine speed, the transmission gear position, and the first output torque of the engine;

[0007] The engine output torque is controlled to decrease from the first output torque to the second output torque, and the second output torque is used as the first output torque to update the operating condition table; wherein, when the duration of the second output torque of the engine is greater than a set time threshold, the rear axle oil temperature is less than a second oil temperature threshold, wherein the second oil temperature threshold is less than the first oil temperature threshold.

[0008] According to another aspect of the present invention, an engine torque control device for a vehicle is provided, characterized in that it comprises:

[0009] The determination module is used to determine the first output torque of the engine at the moment the rear axle oil temperature exceeds the limit, based on the engine speed, transmission gear, and a pre-stored operating condition table at the moment the rear axle oil temperature exceeds the limit; wherein, when the rear axle oil temperature exceeds the limit, the rear axle oil temperature is greater than or equal to a first oil temperature threshold; the operating condition table stores the correspondence between the engine speed, the transmission gear, and the first output torque of the engine;

[0010] The control module is used to control the reduction of the engine's first output torque to a second output torque, and update the operating condition table with the second output torque as the first output torque; wherein, when the duration of the second output torque of the engine is greater than a set time threshold, the rear axle oil temperature is less than a second oil temperature threshold, wherein the second oil temperature threshold is less than the first oil temperature threshold.

[0011] According to another aspect of the present invention, an apparatus is provided, characterized in that the apparatus comprises:

[0012] One or more processors;

[0013] Memory, used to store one or more programs;

[0014] When the one or more programs are executed by the one or more processors, the one or more processors implement the engine torque control method for a vehicle as described in any of the above embodiments.

[0015] According to another aspect of the present invention, a computer-readable storage medium is provided having a computer program stored thereon, characterized in that, when executed by a processor, the program implements the engine torque control method for a vehicle as described in any of the above embodiments.

[0016] The technical solution of this invention reduces the rear axle oil temperature by lowering the engine output torque when the rear axle oil temperature exceeds the limit, and limits the engine output torque to a lower output torque by updating the operating condition table, so that the rear axle oil temperature is kept below the second oil temperature threshold. This can effectively avoid the risk of thermal damage caused by excessive rear axle temperature during vehicle operation.

[0017] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A flowchart of a vehicle engine torque control method provided in Embodiment 1 of the present invention;

[0020] Figure 2 A flowchart illustrating a vehicle engine torque control method according to Embodiment 2 of the present invention;

[0021] Figure 3 A flowchart of a vehicle engine torque control method provided in Embodiment 3 of the present invention;

[0022] Figure 4 A flowchart of a vehicle engine torque control method provided in Embodiment 4 of the present invention;

[0023] Figure 5 A flowchart of a vehicle engine torque control method provided in Embodiment 5 of the present invention.

[0024] Figure 6 A flowchart of a vehicle engine torque control method provided in Embodiment Six of the present invention;

[0025] Figure 7 This is a schematic diagram of a vehicle engine torque control device provided in Embodiment 7 of the present invention;

[0026] Figure 8 This is a schematic diagram of a vehicle engine torque control device provided in Embodiment 8 of the present invention. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0029] Example 1

[0030] Figure 1 This is a flowchart of a vehicle engine torque control method according to Embodiment 1 of the present invention. This embodiment is applicable to engine torque control of rear-wheel drive and four-wheel drive vehicles. The method can be executed by a vehicle engine torque control device, which can be implemented in hardware and / or software, and can be configured in rear-wheel drive and four-wheel drive vehicles. Figure 1 As shown, the method includes:

[0031] S110. When detecting that the rear axle oil temperature exceeds the limit, the engine speed, transmission gear, and pre-stored operating condition table at the moment the rear axle oil temperature exceeds the limit are used to determine the engine output torque at the moment of exceeding the limit as the first output torque.

[0032] Among them, when the rear axle oil temperature exceeds the limit, the rear axle oil temperature is greater than or equal to the first oil temperature threshold; the operating condition table stores the correspondence between engine speed, transmission gear and engine first output torque, where the engine output torque in the operating condition table is recorded as the first output torque.

[0033] Specifically, in rear-wheel drive and four-wheel drive vehicles, the rear axle, besides its load-bearing function, also plays a role in driving, deceleration, and differential. Because the rear axle is close to the vehicle's exhaust pipe and has a worse heat dissipation environment than the front axle, there is a risk of thermal damage due to excessively high rear axle temperature when the vehicle operates under heavy load for extended periods. In this embodiment, a temperature sensor can detect the rear axle oil temperature in real time during vehicle operation. When the detected rear axle oil temperature is greater than or equal to a first oil temperature threshold (i.e., when the rear axle oil temperature exceeds the limit), the engine speed and transmission gear at this time are recorded. Based on the engine speed, transmission gear, and a pre-stored operating condition table in the vehicle, the engine output torque at the moment the oil temperature exceeds the limit can be determined. For example, Table 1 is a pre-stored operating condition table in the vehicle provided in Embodiment 1 of the present invention, where N is the transmission gear and n is the engine speed. The engine operating condition can be determined based on the transmission gear and engine speed, and each operating condition corresponds to the engine's output torque under that condition.

[0034] Table 1

[0035]

[0036] S120: Control the engine's output torque to decrease from the first output torque to the second output torque, and update the operating condition table with the second output torque as the first output torque.

[0037] Specifically, when the duration of the engine's second output torque is greater than a set time threshold, the rear axle oil temperature is less than a second oil temperature threshold, wherein the second oil temperature threshold is less than a first oil temperature threshold.

[0038] In this embodiment, the engine output torque can be reduced by decreasing the fuel injection quantity of the engine injectors or by adjusting the throttle valve to reduce the engine intake air volume. By reducing the engine output torque, the heat generation of the rear axle is reduced. When the heat generation of the rear axle is lower than the heat dissipation, the rear axle oil temperature will decrease. By reducing the engine output torque from the first output torque to the second output torque, when the engine output torque is maintained at the second output torque for a time longer than a set time threshold, the rear axle oil temperature is lower than the second oil temperature threshold. At this time, the value of the first output torque in the operating condition table corresponding to the transmission gear and engine speed is updated to the value of the second output torque. That is, the engine output torque at the corresponding transmission gear and engine speed is limited to the second output torque, so that the rear axle oil temperature is kept below the second oil temperature threshold, which can effectively avoid the risk of heat damage caused by excessive rear axle temperature during vehicle operation.

[0039] The technical solution of this invention, when the rear axle oil temperature exceeds the limit, determines the engine output torque at the time of the over-limit as the first output torque based on the engine speed, transmission gear, and pre-stored operating condition table. It then controls the engine output torque to decrease from the first output torque to a second output torque, and updates the operating condition table using the second output torque as the first output torque. This reduces the engine output torque and thus lowers the rear axle oil temperature when the rear axle oil temperature exceeds the limit. By updating the operating condition table, the engine output torque is limited to a lower level, keeping the rear axle oil temperature below the second oil temperature threshold. This effectively avoids the risk of thermal damage caused by excessively high rear axle temperature during vehicle operation.

[0040] Example 2

[0041] Figure 2 This is a flowchart illustrating a vehicle engine torque control method according to Embodiment 2 of the present invention. Figure 2 As shown, the method includes:

[0042] S210. When detecting that the rear axle oil temperature exceeds the limit, the engine output torque at the time of the rear axle oil temperature exceeding the limit, the gearbox gear, and the pre-stored operating condition table are used to determine the engine output torque at the time of the exceedance as the first output torque.

[0043] Among them, when the rear axle oil temperature exceeds the limit, the rear axle oil temperature is greater than or equal to the first oil temperature threshold; the operating condition table stores the correspondence between engine speed, transmission gear and engine first output torque.

[0044] S220: Control the engine's output torque to decrease from the first output torque to the second output torque, and update the operating condition table with the second output torque as the first output torque.

[0045] Specifically, when the duration of the engine's second output torque is greater than a set time threshold, the rear axle oil temperature is less than a second oil temperature threshold, wherein the second oil temperature threshold is less than a first oil temperature threshold.

[0046] S230. If the rear axle oil temperature is detected to be lower than the third oil temperature threshold, control the engine output torque to increase from the second output torque to the third output torque, and update the operating condition table with the third output torque as the first output torque.

[0047] Among them, the third output torque of the engine satisfies the condition that the rear axle oil temperature is greater than or equal to the third oil temperature threshold and less than the first oil temperature threshold.

[0048] Specifically, when the engine output torque is too low, it will affect the vehicle's power performance. To maximize the vehicle's power performance, it is necessary to appropriately increase the engine output torque while ensuring that the rear axle oil temperature is below the first oil temperature threshold. In this embodiment, after the first output torque in the operating condition table corresponding to the gearbox gear and engine speed is updated to the second output torque, if the rear axle oil temperature is detected to be below the third oil temperature threshold, the engine output torque is increased to the third output torque by increasing the fuel injection quantity of the engine injectors or by adjusting the throttle valve to reduce the engine's intake air volume. The first output torque in the operating condition table corresponding to the gearbox gear and engine speed is then updated to the third output torque, so that the rear axle oil temperature is greater than or equal to the third oil temperature threshold and less than the first oil temperature threshold. By increasing the engine output torque while ensuring that the rear axle oil temperature is below the first oil temperature threshold, the engine's power performance is improved.

[0049] Example 3

[0050] Figure 3 This is a flowchart illustrating a vehicle engine torque control method according to Embodiment 3 of the present invention. Figure 3 As shown, the method includes:

[0051] S310. When detecting that the rear axle oil temperature exceeds the limit, the engine output torque at the time of the rear axle oil temperature exceeding the limit, the transmission gear position, and the pre-stored operating condition table are used to determine the engine output torque at the time of the exceedance as the first output torque.

[0052] Among them, when the rear axle oil temperature exceeds the limit, the rear axle oil temperature is greater than or equal to the first oil temperature threshold; the operating condition table stores the correspondence between engine speed, transmission gear and engine first output torque.

[0053] S321. Control the engine's output torque from a first output torque to a first torque deviation to a first intermediate torque. It's easy to understand that the first torque deviation can be calibrated according to the actual conditions of the vehicle.

[0054] S3221. When the duration of the first intermediate torque satisfying the engine's first intermediate torque is greater than a set time threshold, and the rear axle oil temperature is less than a second oil temperature threshold, the first intermediate torque is determined as the second output torque, and the second output torque is used as the first output torque to update the operating condition table.

[0055] S3222: When the duration of the first intermediate torque not meeting the engine's first intermediate torque exceeds a set time threshold, and the rear axle oil temperature is lower than a second oil temperature threshold, the first intermediate torque is assigned to the first output torque, and the process returns to the step of controlling the first output torque to reduce the first torque deviation to the first intermediate torque.

[0056] In this embodiment, when the engine output torque decreases from the first output torque to the first intermediate torque by the first torque deviation, if the engine output torque does not meet the requirement that the rear axle oil temperature is less than the second oil temperature threshold when the time for maintaining the first intermediate torque is greater than a set time threshold, then the engine output torque is further reduced. Specifically, the engine output torque is reduced by the first torque deviation again, and it is determined whether the reduced engine output torque meets the requirement that the time for maintaining the reduced engine output torque is greater than a set time threshold when the rear axle oil temperature is less than the second oil temperature threshold. If it meets the requirement, the reduced engine output torque is determined as the second output torque, and the second output torque is used as the first output torque to update the operating condition table.

[0057] Optionally, based on the above embodiments, controlling the engine's output torque to decrease from a first output torque to a first torque deviation to a first intermediate torque includes: controlling the engine's output torque to gradually decrease from the first output torque to the first intermediate torque according to a first gradient. By setting the engine's output torque to gradually decrease according to the first gradient, sudden changes in engine output torque are avoided, which helps improve the comfort and safety of vehicle driving.

[0058] Example 4

[0059] Figure 4 This is a flowchart illustrating a vehicle engine torque control method according to Embodiment 4 of the present invention. Figure 4 As shown, the method includes:

[0060] S410. When detecting that the rear axle oil temperature exceeds the limit, the engine output torque at the time of the rear axle oil temperature exceeding the limit, the transmission gear position, and the pre-stored operating condition table are used to determine the engine output torque at the time of the exceedance as the first output torque.

[0061] Among them, when the rear axle oil temperature exceeds the limit, the rear axle oil temperature is greater than or equal to the first oil temperature threshold; the operating condition table stores the correspondence between engine speed, transmission gear and engine first output torque.

[0062] S420: Control the engine's output torque to decrease from the first output torque to the second output torque, and update the operating condition table with the second output torque as the first output torque.

[0063] Specifically, when the duration of the engine's second output torque is greater than a set time threshold, the rear axle oil temperature is less than a second oil temperature threshold, wherein the second oil temperature threshold is less than a first oil temperature threshold.

[0064] S431, control the engine's output torque to increase from the second output torque to the second torque deviation to the second intermediate torque. It's easy to understand that the second torque deviation can be calibrated according to the actual conditions of the vehicle.

[0065] S4321. When the second intermediate torque satisfies the condition that the rear axle oil temperature is greater than or equal to the third oil temperature threshold and less than the first oil temperature threshold, the second intermediate torque is assigned to the third output torque, and the third output torque is used as the first output torque to update the operating condition table.

[0066] S4322: When the second intermediate torque satisfies the condition that the rear axle oil temperature is less than the third oil temperature threshold, the second intermediate torque is assigned to the second output torque, and the process returns to execute the step of increasing the output torque of the control engine from the second output torque to the second intermediate torque.

[0067] In this embodiment, when the engine output torque increases from the second output torque to the second torque deviation to the second intermediate torque, if the engine output torque satisfies the condition that the rear axle oil temperature is less than the third oil temperature threshold, then the engine output torque is further increased. Specifically, the engine output torque is increased by the second torque deviation again, and it is determined whether the increased engine output torque satisfies the condition that the rear axle oil temperature is greater than or equal to the third oil temperature threshold and less than the first oil temperature threshold. If it satisfies the condition, the increased engine output torque is determined as the third output torque, and the third output torque is used as the first output torque to update the operating condition table.

[0068] Optionally, based on the above embodiments, controlling the engine's output torque to increase from a second output torque to a second torque deviation to a second intermediate torque includes: controlling the engine's output torque to gradually increase from the second output torque to the second intermediate torque according to a second gradient. By setting the engine's output torque to gradually increase according to a second gradient, sudden changes in engine output torque are avoided, which helps improve the comfort and safety of vehicle driving.

[0069] Example 5

[0070] Figure 5 This is a flowchart illustrating a vehicle engine torque control method according to Embodiment 5 of the present invention. Figure 5 As shown, the method includes:

[0071] S510. When detecting that the rear axle oil temperature exceeds the limit, the engine output torque at the time of the rear axle oil temperature exceeding the limit, the transmission gear position, and the pre-stored operating condition table are used to determine the engine output torque at the time of the exceedance as the first output torque.

[0072] Among them, when the rear axle oil temperature exceeds the limit, the rear axle oil temperature is greater than or equal to the first oil temperature threshold; the operating condition table stores the correspondence between engine speed, transmission gear and engine first output torque.

[0073] S521, control the engine's output torque to decrease from a first output torque to a first torque deviation to a first intermediate torque. It's easy to understand that the first torque deviation can be calibrated according to the actual conditions of the vehicle.

[0074] S5221. When the duration of the first intermediate torque satisfying the engine's first intermediate torque is greater than a set time threshold, and the rear axle oil temperature is less than a second oil temperature threshold, the first intermediate torque is determined as the second output torque, and the second output torque is used as the first output torque to update the operating condition table.

[0075] S5222: When the duration of the first intermediate torque not meeting the engine's first intermediate torque exceeds a set time threshold, and the rear axle oil temperature is lower than a second oil temperature threshold, the first intermediate torque is assigned to the first output torque, and the process returns to the step of controlling the first output torque to reduce the first torque deviation to the first intermediate torque.

[0076] S531 controls the engine's output torque to increase from the second output torque to the second torque deviation, and then to the second intermediate torque. It's easy to understand that the second torque deviation can be calibrated according to the actual conditions of the vehicle.

[0077] S5321. When the second intermediate torque satisfies the condition that the rear axle oil temperature is greater than or equal to the third oil temperature threshold and less than the first oil temperature threshold, the second intermediate torque is assigned to the third output torque, and the third output torque is used as the first output torque to update the operating condition table.

[0078] S5322: When the second intermediate torque satisfies the condition that the rear axle oil temperature is less than the third oil temperature threshold, the second intermediate torque is assigned to the second output torque, and the process returns to execute the step of increasing the output torque of the engine from the second output torque to the second intermediate torque.

[0079] Optionally, the value of the first torque deviation is greater than the value of the second torque deviation. Setting the value of the first torque deviation to be greater than the value of the second torque deviation results in a smaller increase in engine output torque compared to the decrease in engine output torque, thus preventing the rear axle oil temperature from rising too quickly and improving vehicle safety during operation.

[0080] Example 6

[0081] Figure 6 This is a flowchart illustrating a vehicle engine torque control method according to Embodiment Six of the present invention. Figure 6 As shown, the method includes:

[0082] S600: Determine whether the ambient temperature is greater than or equal to the ambient temperature threshold. If yes, proceed to S601; otherwise, proceed to S660.

[0083] Specifically, when the ambient temperature is lower than the ambient temperature threshold, it can be assumed that the ambient temperature around the vehicle is low and the rear axle has good heat dissipation, so there is no need to reduce the heat generation of the rear axle by reducing the output torque of the vehicle's engine.

[0084] S601. Determine whether the rear axle oil temperature is greater than or equal to the first oil temperature threshold. If yes, execute S610; otherwise, execute S660.

[0085] S610. When detecting that the rear axle oil temperature exceeds the limit, the engine output torque at the time of the rear axle oil temperature exceeding the limit, the transmission gear position, and the pre-stored operating condition table are used to determine the engine output torque at the time of the exceedance as the first output torque.

[0086] S620: Control the engine's output torque to decrease from the first output torque to the second output torque, and update the operating condition table with the second output torque as the first output torque.

[0087] S630. Determine if the rear axle oil temperature is lower than the third oil temperature threshold. If yes, execute S640; otherwise, execute S650.

[0088] S640: Control the engine's output torque to decrease from the first output torque to the second output torque, and update the operating condition table with the second output torque as the first output torque.

[0089] S650: Determine whether the rear axle oil temperature is greater than or equal to the first oil temperature threshold. If yes, determine that the rear axle oil temperature exceeds the limit and execute S610. If no, execute S660.

[0090] S660, The method for controlling the engine torque of the vehicle ends.

[0091] Example 7

[0092] Figure 7 This is a schematic diagram of a vehicle engine torque control device provided in Embodiment 7 of the present invention. Figure 7 As shown, the device includes:

[0093] The determination module 10 is used to determine the first output torque of the engine at the time of the over-limit detection of the rear axle oil temperature, based on the engine speed, transmission gear, and pre-stored operating condition table at the time of the over-limit detection. Wherein, when the rear axle oil temperature exceeds the limit, the rear axle oil temperature is greater than or equal to the first oil temperature threshold. The operating condition table stores the correspondence between engine speed, transmission gear, and the first output torque of the engine.

[0094] The control module 20 is used to control the reduction of the engine's first output torque to a second output torque, and update the operating condition table with the second output torque as the first output torque; wherein, when the duration of the second output torque of the engine is greater than a set time threshold, the rear axle oil temperature is less than a second oil temperature threshold, wherein the second oil temperature threshold is less than the first oil temperature threshold.

[0095] The vehicle engine torque control device provided in the embodiments of the present invention can execute the vehicle engine torque control method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of executing the method.

[0096] Example 8

[0097] Figure 8 This is a schematic diagram of a vehicle engine torque control device provided in Embodiment 8 of the present invention. Figure 8 As shown, the device includes a processor 40 and a memory 41; the number of processors 40 in the device can be one or more. Figure 8 Taking a processor 40 as an example; the processor 40 and memory 41 in the device can be connected via a bus or other means. Figure 8 Taking the example of a connection between China and Israel via a bus.

[0098] The memory 41, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules, such as the program module corresponding to the vehicle engine torque control method in this embodiment of the invention. The processor 40 executes various functional applications and data processing of the system by running the software programs, instructions, and modules stored in the memory 41, thereby realizing the aforementioned vehicle engine torque control method.

[0099] The memory 41 may primarily include a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a given function; the data storage area may store data created based on terminal usage. Furthermore, the memory 41 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory, or other non-volatile solid-state storage device. In some instances, the memory 41 may further include memory remotely located relative to the processor 40, which can be connected to the system via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0100] Example 9

[0101] Embodiment 9 of the present invention also provides a storage medium containing a computer-executable program, which, when executed by a computer processor, is used to perform the engine torque control method of any of the vehicles described in the above embodiments.

[0102] Based on the above description of the implementation methods, those skilled in the art can clearly understand that the present invention can be implemented using software and necessary general-purpose hardware, and of course, it can also be implemented using hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk, or optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0103] It is worth noting that in the embodiments of the engine torque control device of the above-mentioned vehicle, the various units and modules included are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be achieved; in addition, the specific names of each functional unit are only for easy distinction between each other and are not used to limit the scope of protection of the present invention.

[0104] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0105] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for controlling engine torque in a vehicle, characterized in that, When detecting that the rear axle oil temperature exceeds the limit, the engine output torque at the time of the over-limit is determined as the first output torque based on the engine speed, transmission gear, and pre-stored operating condition table at the time of the over-limit. Specifically, when the rear axle oil temperature exceeds the limit, the rear axle oil temperature is greater than or equal to the first oil temperature threshold. The operating condition table stores the correspondence between the engine speed, the transmission gear, and the engine's first output torque. The engine output torque is controlled to decrease from the first output torque to the second output torque, and the second output torque is used as the first output torque to update the operating condition table; wherein, when the duration of the second output torque of the engine is greater than a set time threshold, the rear axle oil temperature is less than a second oil temperature threshold, wherein the second oil temperature threshold is less than the first oil temperature threshold; If the rear axle oil temperature is detected to be lower than the third oil temperature threshold, the engine output torque is controlled to increase from the second output torque to the third output torque, and the third output torque is used as the first output torque to update the operating condition table; wherein, the third output torque of the engine satisfies the condition that the rear axle oil temperature is greater than or equal to the third oil temperature threshold and less than the first oil temperature threshold; If the rear axle oil temperature is detected to be greater than or equal to the third oil temperature threshold, and the rear axle oil temperature is less than the first oil temperature threshold, the engine torque control method for controlling the vehicle ends. If the rear axle oil temperature is detected to be greater than or equal to the third oil temperature threshold, and the rear axle oil temperature is greater than or equal to the first oil temperature threshold, it is determined that the rear axle oil temperature is out of limit, and the process returns to the step of determining the first output torque of the engine at the time of the out-of-limit detection based on the engine speed, transmission gear, and pre-stored operating condition table at the time of the out-of-limit detection.

2. The engine torque control method for a vehicle according to claim 1, characterized in that, The step of controlling the engine's output torque to decrease from a first output torque to a second output torque, and updating the operating condition table with the second output torque as the first output torque, includes: The output torque of the engine is controlled to decrease from the first output torque to a first intermediate torque by a first torque deviation. When the duration for which the first intermediate torque satisfies the first intermediate torque of the engine is greater than a set time threshold, and the rear axle oil temperature is less than a second oil temperature threshold, the first intermediate torque is determined as the second output torque, and the second output torque is used as the first output torque to update the operating condition table. When the duration for which the first intermediate torque does not meet the first intermediate torque of the engine exceeds a set time threshold, and the rear axle oil temperature is less than a second oil temperature threshold, the first intermediate torque is assigned to the first output torque, and the process returns to the step of controlling the first output torque to reduce the first torque deviation to the first intermediate torque.

3. The engine torque control method for a vehicle according to claim 2, characterized in that, The control of the engine's output torque to decrease from the first output torque to a first intermediate torque by a first torque deviation includes: The engine's output torque is gradually reduced from the first output torque to the first intermediate torque according to the first gradient control.

4. The engine torque control method for a vehicle according to claim 1, characterized in that, If the rear axle oil temperature is detected to be lower than a third oil temperature threshold, the step of controlling the engine output torque to increase from the second output torque to the third output torque, and updating the operating condition table with the third output torque as the first output torque, includes: The output torque of the engine is controlled to increase from the second output torque to the second torque deviation to the second intermediate torque; when the second intermediate torque satisfies the condition that the rear axle oil temperature is greater than or equal to the third oil temperature threshold and less than the first oil temperature threshold, the second intermediate torque is assigned to the third output torque, and the third output torque is used as the first output torque to update the operating condition table; When the second intermediate torque satisfies the condition that the rear axle oil temperature is less than the third oil temperature threshold, the second intermediate torque is assigned to the second output torque, and the process returns to the step of controlling the engine output torque to increase from the second output torque to the second intermediate torque. The control of the engine's output torque to increase from the second output torque to a second torque deviation to a second intermediate torque includes: The engine's output torque is gradually increased from the second output torque to the second intermediate torque according to the second gradient control.

5. The engine torque control method for a vehicle according to claim 1, characterized in that, Before determining the engine output torque at the moment of exceeding the limit as the first output torque, based on the engine speed, transmission gear position, and pre-stored operating condition table at the time of the exceeding limit, when detecting that the rear axle oil temperature exceeds the limit, the process further includes: Determine whether the ambient temperature is greater than or equal to the ambient temperature threshold. If so, continue to execute the step of determining the engine output torque at the time of the over-limit detection of the rear axle oil temperature as the first output torque based on the engine speed, transmission gear, and pre-stored operating condition table at the time of the over-limit detection. If not, the method for controlling the engine torque of the vehicle ends.

6. The engine torque control method for a vehicle according to any one of claims 1-5, characterized in that, Before determining the engine output torque at the moment of exceeding the limit as the first output torque based on the engine speed, transmission gear position, and pre-stored operating condition table at the time the rear axle oil temperature exceeds the limit, the method further includes: Determine whether the rear axle oil temperature is greater than or equal to the first oil temperature threshold. If so, continue to execute the step of determining the first output torque of the engine at the time of the over-limit detection of the rear axle oil temperature based on the engine speed, transmission gear, and pre-stored operating condition table at the time of the over-limit detection. If not, the method for controlling the engine torque of the vehicle ends.

7. An engine torque control device for a vehicle, used to execute the engine torque control method of any one of claims 1-6, characterized in that, include: The determination module is used to determine the first output torque of the engine at the moment the rear axle oil temperature exceeds the limit, based on the engine speed, transmission gear, and a pre-stored operating condition table at the moment the rear axle oil temperature exceeds the limit; wherein, when the rear axle oil temperature exceeds the limit, the rear axle oil temperature is greater than or equal to a first oil temperature threshold; the operating condition table stores the correspondence between the engine speed, the transmission gear, and the first output torque of the engine; The control module is used to control the reduction of the engine's first output torque to a second output torque, and update the operating condition table with the second output torque as the first output torque; wherein, when the duration of the second output torque of the engine is greater than a set time threshold, the rear axle oil temperature is less than a second oil temperature threshold, wherein the second oil temperature threshold is less than the first oil temperature threshold.

8. A computer device, characterized in that, The computer device includes: One or more processors; Memory, used to store one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method as described in any one of claims 1-6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the method as described in any one of claims 1-6.

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