Engine slow torque function control method, device, equipment and readable storage medium

Abstract

A method, device, equipment and readable storage medium for controlling an engine torque reduction function, the method comprising: obtaining the gear position of a vehicle's transmission; determining a target torque change rate limit of the engine according to the transmission gear position or the transmission speed ratio corresponding to the transmission gear position; and performing engine torque reduction according to the target torque change rate limit. Engine torque reduction can be performed with different target torque change rate limits in different gear positions, and furthermore, engine torque reduction can be performed with a lower target torque change rate limit in gear positions with a higher transmission speed ratio, thereby avoiding excessive torque change rate at the transmission system that causes vehicle oscillation. Meanwhile, engine torque reduction can be performed with a higher target torque change rate limit in gear positions with a lower transmission speed ratio, thereby achieving the fastest possible increase in engine torque while maintaining vehicle smoothness, ultimately achieving an effective balance between the vehicle's torque response capability and the smoothness of the torque increase process.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle torque control, and in particular to a method, device, equipment and readable storage medium for controlling an engine torque reduction function. Background Art

[0002] Currently, to prevent sudden torque changes in the vehicle's drivetrain during fueling and de-fueling, a common practice is to add a torque damping function to the engine to limit the rate of change of engine torque, preventing oscillation caused by sudden torque changes in the drivetrain. The torque damping function essentially reduces the rate of change of the drivetrain's torque, thereby preventing oscillation. However, the rate of change of the drivetrain's torque is strongly correlated with the transmission ratio. For example, in low gears, the transmission ratio is large, and the torque and rate of change are amplified, requiring strict limits on engine torque changes. In high gears, the transmission ratio is small, and the torque and rate of change are not amplified. Limiting engine torque changes is generally unnecessary, and limiting it can lead to sluggish acceleration and deceleration responses.

[0003] Therefore, the method of fixedly increasing the engine torque reduction in related technologies to prevent the vehicle transmission system from oscillating will affect the driving experience of the vehicle under certain working conditions. For example, if the torque reduction function is too strict, it will cause the acceleration and deceleration response of the entire vehicle to be sluggish, or if the torque reduction function is too loose, the transmission system oscillation and jerking phenomenon will still be obvious. Summary of the Invention

[0004] The present application provides an engine torque reduction function control method, device, equipment and readable storage medium, which can solve the technical problems existing in the above-mentioned prior art.

[0005] In a first aspect, an embodiment of the present application provides a method for controlling an engine torque reduction function, which adopts the following technical solutions:

[0006] A method for controlling an engine torque reduction function, characterized in that the method comprises:

[0007] Get the vehicle's transmission gear;

[0008] determining a target torque change rate limit of the engine according to the gear position of the transmission or the transmission ratio corresponding to the gear position of the transmission;

[0009] The engine torque is reduced according to the target torque change rate limit.

[0010] In combination with the first aspect, in one embodiment, determining the target torque change rate limit of the engine according to the transmission gear or the transmission speed ratio corresponding to the transmission gear includes the following steps:

[0011] The target torque change rate limit of the engine is determined based on the correspondence between the preset multiple transmission gears and the multiple engine torque change rates.

[0012] In combination with the first aspect, in one embodiment, the same engine torque change rate corresponds to at least one transmission gear position.

[0013] In combination with the first aspect, in one embodiment, the difference in transmission speed ratios between multiple transmission gears corresponding to the same torque change rate is less than a preset speed ratio difference threshold.

[0014] In combination with the first aspect, in one embodiment, determining the target torque change rate limit of the engine according to the transmission speed ratio corresponding to the gear position of the transmission includes the following steps:

[0015] Obtaining a preset torque change rate threshold of the transmission system;

[0016] The target torque change rate limit of the engine is determined according to a calculation result of combining the transmission speed ratio corresponding to the gear position of the transmission and the torque change rate threshold.

[0017] In combination with the first aspect, in one embodiment, the target torque change rate limit of the engine is determined based on a calculation result of a combination of the transmission ratio corresponding to the gearbox gear position and the torque change rate threshold.

[0018] The target torque change rate limit of the engine is a ratio of the torque change rate threshold to the transmission speed ratio corresponding to the gearbox gear.

[0019] In combination with the first aspect, in one embodiment, before obtaining the preset torque change rate threshold of the transmission system, the following steps are included:

[0020] Get the vehicle's operating mode;

[0021] The torque change rate threshold involved in subsequent calculations is determined according to the preset correspondence between the operating mode and the multiple torque change rate thresholds.

[0022] In a second aspect, an embodiment of the present application provides an engine torque reduction function control device, which adopts the following technical solutions:

[0023] An engine slow torque function control device, the engine slow torque function control device comprising:

[0024] an acquisition module configured to acquire a transmission gear position of the vehicle;

[0025] a torque change rate limiting module configured to determine a target torque change rate limit value of the engine according to the transmission gear or the transmission speed ratio corresponding to the transmission gear;

[0026] The torque reduction module is configured to reduce the engine torque according to the target torque change rate limit.

[0027] In a third aspect, an embodiment of the present application provides an engine torque reduction function control device, which adopts the following technical solutions:

[0028] An engine torque reduction function control device comprises a processor, a memory, and an engine torque reduction function control program stored in the memory and executable by the processor, wherein when the engine torque reduction function control program is executed by the processor, the steps of the engine torque reduction function control method as described above are implemented.

[0029] In a fourth aspect, an embodiment of the present application provides a readable storage medium, which adopts the following technical solution:

[0030] A readable storage medium stores an engine slow torque function control program, wherein when the engine slow torque function control program is executed by a processor, the steps of the engine slow torque function control method as described above are implemented.

[0031] The beneficial effects of the technical solutions provided in the embodiments of the present application include:

[0032] By determining the appropriate target torque change rate limit for the current engine according to the vehicle's current transmission gear or the transmission speed ratio corresponding to the transmission gear before limiting the engine's torque change rate, it is possible to perform engine detent at different gears with different target torque change rate limits, and then perform engine detent at a lower target torque change rate limit when the transmission speed ratio is higher, thereby avoiding excessive torque change rate at the transmission system and causing vehicle oscillation. At the same time, it is possible to perform engine detent at a higher target torque change rate limit when the transmission speed ratio is lower, thereby achieving the vehicle being able to maintain smoothness while the engine's torque can be increased as quickly as possible, ultimately achieving an effective balance between the vehicle's torque responsiveness and the smoothness of the torque increase process. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a flow chart of an embodiment of a method for controlling the engine torque reduction function of the present application;

[0034] Figure 2 This is a functional module diagram of an embodiment of the engine slow torque control device of the present application;

[0035] Figure 3 This is a schematic diagram of the hardware structure of the engine torque reduction function control device involved in the embodiment of the present application. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] Currently, to prevent sudden torque changes in the vehicle's drivetrain during fueling and de-fueling, a common practice is to add a torque damping function to the engine to limit the rate of change of engine torque, preventing oscillation caused by sudden torque changes in the drivetrain. The torque damping function essentially reduces the rate of change of the drivetrain's torque, thereby preventing oscillation. However, the rate of change of the drivetrain's torque is strongly correlated with the transmission ratio. For example, in low gears, the transmission ratio is large, and the torque and rate of change are amplified, requiring strict limits on engine torque changes. In high gears, the transmission ratio is small, and the torque and rate of change are not amplified. Limiting engine torque changes is generally unnecessary, and limiting it can lead to sluggish acceleration and deceleration responses.

[0038] Therefore, the method of fixedly increasing the engine torque reduction in related technologies to prevent the vehicle transmission system from oscillating will affect the driving experience of the vehicle under certain working conditions. For example, if the torque reduction function is too strict, it will cause the acceleration and deceleration response of the entire vehicle to be sluggish, or if the torque reduction function is too loose, the transmission system oscillation and jerking phenomenon will still be obvious.

[0039] Based on the above problems, the present application provides an engine detent function control method, device, equipment and readable storage medium. The key point of the invention is that before imposing a limit on the engine's torque change rate, the current engine's appropriate target torque change rate limit is determined according to the vehicle's current transmission gear or the transmission speed ratio corresponding to the transmission gear, so that the engine detent can be performed with different target torque change rate limits in different gears, and then the engine detent can be performed with a lower target torque change rate limit in a gear with a higher transmission speed ratio, avoiding excessive torque change rate at the transmission system and causing vehicle oscillation, and at the same time, the engine detent can be performed with a higher target torque change rate limit in a gear with a lower transmission speed ratio, so that the vehicle can maintain smoothness while the engine's torque can be increased as quickly as possible, ultimately achieving an effective balance between the vehicle's torque response capability and the smoothness of the torque increase process.

[0040] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0041] In a first aspect, an embodiment of the present application provides a method for controlling an engine torque reduction function.

[0042] In one embodiment, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the engine slow torque control method of this application. Figure 1 As shown, the engine slow torque function control method includes:

[0043] A method for controlling an engine torque reduction function, the method comprising:

[0044] S100, obtaining the gear position of the vehicle's transmission;

[0045] S200, determining a target torque change rate limit of the engine according to the transmission gear or the transmission speed ratio corresponding to the transmission gear;

[0046] Specifically, the EECU in the vehicle can introduce a deceleration module for classification according to the current gear signal, for example, according to the current specific gear or the speed ratio corresponding to each gear, to classify the corresponding deceleration activation intervals and the torque change rate within the interval.

[0047] S300: Perform engine torque reduction according to the target torque change rate limit.

[0048] After obtaining the target torque change rate limit corresponding to the current transmission gear or transmission speed ratio, the engine's detent function can be implemented according to the target torque change rate limit. How the engine specifically implements the detent function is not the main technical solution of this application, so it will not be elaborated here. You can refer to the relevant technologies in the industry. However, after determining the target torque change rate limit through the relevant steps of this application, any form of implementation of the engine's detent function according to the target torque change rate limit should be deemed to be within the scope of protection of this application.

[0049] Ultimately, by determining the appropriate target torque change rate limit for the current engine based on the vehicle's current transmission gear or the transmission speed ratio corresponding to the transmission gear before limiting the engine's torque change rate, it is possible to perform engine detent at different gears with different target torque change rate limits, and then perform engine detent at a lower target torque change rate limit when the transmission speed ratio is higher, thereby avoiding excessive torque change rate at the transmission system and causing vehicle oscillation. At the same time, it is possible to perform engine detent at a higher target torque change rate limit when the transmission speed ratio is lower, thereby achieving the fastest possible increase in the engine torque while maintaining vehicle smoothness, and ultimately achieving an effective balance between the vehicle's torque response capability and the smoothness of the torque increase process.

[0050] Furthermore, in one embodiment, the step S200 of determining the target torque change rate limit of the engine according to the transmission gear or the transmission ratio corresponding to the transmission gear includes the following steps:

[0051] S210: Determine a target torque change rate limit value of the engine according to a preset correspondence between multiple transmission gears and multiple engine torque change rates.

[0052] For example, in some embodiments, for a commercial vehicle with 12 gears, a specific engine torque variation rate can be preset for each gear. Specifically, each transmission gear corresponds to a different engine torque variation rate. With this configuration, after the current transmission gear is determined, the corresponding engine torque variation rate can be used as the target engine torque variation rate limit. Furthermore, in other embodiments, some of the 12 gears with similar transmission ratios can be considered gears of the same level. Gears of the same level have the same engine torque variation rate, while gears of different levels have different engine torque variation rates. Furthermore, as the gear level increases or decreases, the engine torque variation rate will also vary accordingly.

[0053] Furthermore, in one embodiment, the same engine torque change rate corresponds to at least one transmission gear position.

[0054] Specifically, the difference in transmission speed ratios between the multiple transmission gears corresponding to the same torque change rate is less than a preset speed ratio difference threshold.

[0055] This arrangement allows some gears with similar transmission ratios to correspond to the same engine torque rate. Because the transmission ratios are relatively close, when these gears use the same engine torque rate for torque easing, the corresponding transmission torque rates within the transmission system are similar, resulting in a very similar or essentially identical user experience. This ultimately simplifies the control process for multi-gear vehicles during actual driving, making it easier to implement and further reducing design costs.

[0056] Furthermore, in some other embodiments, different from the above embodiments, step S200, determining the target torque change rate limit of the engine according to the transmission ratio corresponding to the gear position of the transmission, includes the following steps:

[0057] S210, obtaining a preset torque change rate threshold of the transmission system;

[0058] S220: Determine a target torque change rate limit of the engine according to a calculation result of combining the transmission ratio corresponding to the transmission gear position and the torque change rate threshold.

[0059] Specifically, the transmission's torque rate of change threshold is a pre-calibrated parameter for the vehicle. Within this threshold, the vehicle's torque changes smoothly. When the transmission's torque rate of change exceeds this threshold, the vehicle's torque changes will experience noticeable jerks, impacting the user's driving experience. Therefore, by combining the transmission ratio corresponding to the current gear position with the torque rate of change threshold, we can determine the target torque rate of change limit that needs to be applied to the engine, ensuring that the engine's torque rate of change remains below the torque rate of change threshold at the transmission.

[0060] This setting can achieve gear adaptation in the design. For example, the torque change of the vehicle's transmission system causes oscillation, so it is necessary to slow down the torque. The torque change rate is related to the speed ratio of each gear of the transmission. Therefore, the torque change rate threshold of the transmission system can be set according to the principle of oscillation generation. According to the speed ratio of the transmission in the current gear, the torque change rate limit of the torque generation source - the engine - can be adaptively calculated.

[0061] Furthermore, in some embodiments, the target torque change rate limit of the engine is determined based on a calculation result of combining the transmission ratio corresponding to the gearbox gear position and the torque change rate threshold.

[0062] The target torque change rate limit of the engine is a ratio of the torque change rate threshold to the transmission speed ratio corresponding to the gearbox gear.

[0063] Furthermore, in some embodiments, before the step S210 of obtaining the preset torque change rate threshold of the transmission system, the following steps are included:

[0064] S201, obtaining the vehicle's operating mode;

[0065] S202 : Determine a torque change rate threshold value involved in subsequent calculations based on a preset correspondence between the operating mode and a plurality of torque change rate threshold values.

[0066] For vehicles, since users may have different torque response requirements, vehicles often have different operating modes during operation, such as an operating mode that can respond to torque faster, or a smoother and more economical operating mode. Therefore, in different operating modes, the torque change rate threshold needs to be adjusted to meet the different torque response requirements of users.

[0067] Therefore, in this embodiment, by matching the operating modes with various torque change rate thresholds in advance, the corresponding torque change rate threshold can be used to perform the subsequent engine detent function when entering a certain operating mode.

[0068] In a second aspect, an embodiment of the present application also provides an engine torque reduction function control device.

[0069] In one embodiment, referring to Figure 2 , Figure 2 This is a functional module diagram of an embodiment of the engine slow torque control device of the present application. Figure 2 As shown, the engine slow torque function control device includes:

[0070] an acquisition module configured to acquire a transmission gear position of the vehicle;

[0071] a torque change rate limiting module configured to determine a target torque change rate limit value of the engine according to the transmission gear or the transmission speed ratio corresponding to the transmission gear;

[0072] The torque reduction module is configured to reduce the engine torque according to the target torque change rate limit.

[0073] Furthermore, in one embodiment, the torque change rate limiting module of the engine torque reduction function control device is used to:

[0074] When determining the target torque change rate limit of the engine according to the transmission gear or the transmission speed ratio corresponding to the transmission gear, the following steps are included:

[0075] The target torque change rate limit of the engine is determined based on the correspondence between the preset multiple transmission gears and the multiple engine torque change rates.

[0076] Furthermore, in one embodiment, the torque change rate limiting module of the engine torque reduction function control device is used to:

[0077] The same engine torque change rate corresponds to at least one transmission gear position.

[0078] Furthermore, in one embodiment, the torque change rate limiting module of the engine torque reduction function control device is used to:

[0079] The difference in transmission speed ratios between the plurality of transmission gears corresponding to the same torque change rate is less than a preset speed ratio difference threshold.

[0080] Furthermore, in one embodiment, the torque change rate limiting module of the engine torque reduction function control device is used to:

[0081] When determining the target torque change rate limit of the engine according to the transmission speed ratio corresponding to the gear position of the transmission, the following steps are included:

[0082] Obtaining a preset torque change rate threshold of the transmission system;

[0083] The target torque change rate limit of the engine is determined according to a calculation result of combining the transmission speed ratio corresponding to the gear position of the transmission and the torque change rate threshold.

[0084] Furthermore, in one embodiment, the torque change rate limiting module of the engine torque reduction function control device is used to:

[0085] In determining the target torque change rate limit of the engine according to the calculation result of combining the transmission ratio corresponding to the gearbox gear position and the torque change rate threshold,

[0086] The target torque change rate limit of the engine is a ratio of the torque change rate threshold to the transmission speed ratio corresponding to the gearbox gear.

[0087] Furthermore, in one embodiment, the torque change rate limiting module of the engine torque reduction function control device is used to:

[0088] Before obtaining the preset torque change rate threshold of the transmission system, the following steps are included:

[0089] Get the vehicle's operating mode;

[0090] The torque change rate threshold involved in subsequent calculations is determined according to the preset correspondence between the operating mode and the multiple torque change rate thresholds.

[0091] Among them, the functional implementation of each module in the above-mentioned engine slow torque function control device corresponds to the various steps in the above-mentioned engine slow torque function control method embodiment, and its functions and implementation processes will not be repeated here one by one.

[0092] Ultimately, by determining the appropriate target torque change rate limit for the current engine based on the vehicle's current transmission gear or the transmission speed ratio corresponding to the transmission gear before limiting the engine's torque change rate, it is possible to perform engine detent at different gears with different target torque change rate limits, and then perform engine detent at a lower target torque change rate limit when the transmission speed ratio is higher, thereby avoiding excessive torque change rate at the transmission system and causing vehicle oscillation. At the same time, it is possible to perform engine detent at a higher target torque change rate limit when the transmission speed ratio is lower, thereby achieving the fastest possible increase in the engine torque while maintaining vehicle smoothness, and ultimately achieving an effective balance between the vehicle's torque response capability and the smoothness of the torque increase process.

[0093] On the third aspect, an embodiment of the present application provides an engine torque reduction function control device, which can be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0094] Reference Figure 3 , Figure 3 Schematic diagram of the hardware structure of the engine slow torque function control device involved in the embodiment of the present application. In the embodiment of the present application, the engine slow torque function control device may include a processor, a memory, a communication interface and a communication bus.

[0095] The communication bus may be of any type and is used to interconnect the processor, memory, and communication interface.

[0096] Communication interfaces include input / output (I / O) interfaces, physical interfaces, and logical interfaces, used to interconnect components within the engine torque reduction control device, as well as interfaces used to interconnect the engine torque reduction control device with other devices (such as other computing devices or user devices). Physical interfaces can include Ethernet, fiber optic, and ATM interfaces; user devices can include displays and keyboards.

[0097] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0098] The processor may be a general-purpose processor, which may call the engine slow torque function control program stored in the memory and execute the engine slow torque function control method provided in the embodiment of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the engine slow torque function control program is called may refer to the various embodiments of the engine slow torque function control method of the present application, which will not be repeated here.

[0099] Those skilled in the art will understand that Figure 3 The hardware structure shown in the figure does not constitute a limitation to the present application and may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components.

[0100] In a fourth aspect, an embodiment of the present application also provides a readable storage medium.

[0101] The readable storage medium of the present application stores an engine slow torque function control program, wherein when the engine slow torque function control program is executed by the processor, the steps of the engine slow torque function control method as described above are implemented.

[0102] Among them, the method implemented when the engine torque reduction function control program is executed can refer to the various embodiments of the engine torque reduction function control method of the present application, and will not be repeated here.

[0103] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0104] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit the "first", "second" and "third" to different types.

[0105] In the description of the embodiments of this application, the words "exemplary," "for example," or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary," "for example," or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "for example," or "for example" is intended to present the relevant concepts in a concrete manner.

[0106] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0107] In some processes described in the embodiments of the present application, multiple operations or steps are included that appear in a specific order. However, it should be understood that these operations or steps may not be performed in the order in which they appear in the embodiments of the present application or may be performed in parallel. The sequence numbers of the operations are only used to distinguish between different operations, and the sequence numbers themselves do not represent any order of execution. In addition, these processes may include more or fewer operations, and these operations or steps may be performed in sequence or in parallel, and these operations or steps may be combined.

[0108] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for enabling a terminal device to execute the methods described in each embodiment of the present application.

[0109] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for controlling an engine's slow torque function, characterized in that: The method comprises: Get the vehicle's transmission gear; determining a target torque change rate limit of the engine according to the gear position of the transmission or the transmission ratio corresponding to the gear position of the transmission; performing engine detent torqueing according to the target torque change rate limit; Determining the target torque change rate limit of the engine according to the transmission speed ratio corresponding to the gear position of the transmission includes the following steps: Obtaining a preset torque change rate threshold of the transmission system; determining a target torque change rate limit of the engine based on a calculation result of a combination of a transmission ratio corresponding to the gear position of the transmission and the torque change rate threshold; The transmission ratio corresponding to the gearbox gear and the torque change rate threshold The target torque change rate limit of the engine is determined by combining the calculation results of the values. The target torque change rate limit of the engine is a ratio of the torque change rate threshold to the transmission speed ratio corresponding to the gearbox gear.

2. The engine slow torque function control method according to claim 1, characterized in that: Determining a target torque change rate limit of the engine according to the transmission gear or the transmission speed ratio corresponding to the transmission gear, comprising the following steps: The target torque change rate limit of the engine is determined based on the correspondence between the preset multiple transmission gears and the multiple engine torque change rates.

3. The engine slow torque function control method according to claim 2, characterized in that: The same engine torque change rate corresponds to at least one transmission gear position.

4. The engine slow torque function control method according to claim 3, characterized in that: The difference in transmission speed ratios between the plurality of transmission gears corresponding to the same torque change rate is less than a preset speed ratio difference threshold.

5. The engine slow torque function control method according to claim 1, Its characteristics are Before obtaining the preset torque change rate threshold of the transmission system, the following steps are included: Get the vehicle's operating mode; The torque change rate threshold involved in subsequent calculations is determined according to the preset correspondence between the operating mode and the multiple torque change rate thresholds.

6. An engine slow torque function control device, characterized in that: The engine slow torque function control device comprises: an acquisition module configured to acquire a transmission gear position of the vehicle; a torque change rate limiting module configured to determine a target torque change rate limit value of the engine according to the transmission gear or the transmission speed ratio corresponding to the transmission gear; a torque reduction module configured to reduce the engine torque according to the target torque change rate limit; Determining the target torque change rate limit of the engine according to the transmission speed ratio corresponding to the gear position of the transmission includes the following steps: Obtaining a preset torque change rate threshold of the transmission system; determining a target torque change rate limit of the engine based on a calculation result of a combination of a transmission ratio corresponding to the gear position of the transmission and the torque change rate threshold; The transmission ratio corresponding to the gearbox gear and the torque change rate threshold The target torque change rate limit of the engine is determined by combining the calculation results of the values. The target torque change rate limit of the engine is a ratio of the torque change rate threshold to the transmission speed ratio corresponding to the gearbox gear.

7. An engine torque reduction function control device, characterized in that: The engine torque reduction function control device includes a processor, a memory, and an engine torque reduction function control program stored in the memory and executable by the processor, wherein when the engine torque reduction function control program is executed by the processor, the steps of the engine torque reduction function control method as described in any one of claims 1 to 5 are implemented.

8. A readable storage medium, characterized in that: The readable storage medium stores an engine slow torque function control program, wherein when the engine slow torque function control program is executed by the processor, the steps of the engine slow torque function control method according to any one of claims 1 to 5 are implemented.

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