Engine torque control method, control system, vehicle and storage medium

Abstract

This invention discloses an engine torque control method, comprising: collecting data; determining whether triggering conditions are met based on the collected data; if the vehicle meets the triggering conditions, the four-wheel drive torque control module sends a torque control request to the engine management system; the engine management system will only perform torque control operation after receiving a valid torque control status and the torque control value output by the four-wheel drive torque control module is within a set range. This engine torque control method can control engine torque through the four-wheel drive system even when the four-wheel drive system has a certain temperature and speed difference, protecting the four-wheel drive system clutch and extending the four-wheel drive system's operating time while ensuring the vehicle's four-wheel drive performance and preserving sufficient vehicle off-road capability. This invention also discloses a control system for implementing the described engine torque control method, a vehicle, and a computer-readable storage medium.

Description

Technical Field

[0001] This invention belongs to the field of automotive technology. Specifically, this invention relates to an engine torque control method, a control system, a vehicle, and a storage medium. Background Technology

[0002] When a vehicle is in a situation with poor front axle traction, such as on a split road, a split slope, or when only one rear wheel is stuck, or when only one side of the rear axle has good traction, the excessive residual power output of the engine will cause the four-wheel drive clutch plates to experience high torque and high speed differences. At this time, the high power heat will cause problems such as premature overheating and rapid wear of the transmission four-wheel drive clutch, affecting the four-wheel drive performance. In severe cases, it will lead to clutch wear failure of the four-wheel drive system and loss of four-wheel drive function.

[0003] Current four-wheel drive vehicles rely solely on the TCS (Traction Control System) of the braking system to suppress speed differences or torque under these conditions, unable to adjust themselves. This is ineffective and easily leads to overheating and premature wear of the four-wheel drive system. Although the four-wheel drive system has overheat protection and will disconnect the four-wheel drive clutch for cooling, this strategy will cause the vehicle to lose four-wheel drive function, resulting in reduced overall vehicle performance and making it unable to get out of trouble.

[0004] The aim is to provide an improved engine torque control method, particularly regarding how to control engine torque through the four-wheel drive system under certain temperature and speed differences, so as to protect the four-wheel drive system clutch and extend the four-wheel drive system's operating time while maintaining sufficient vehicle off-road capability. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention provides an engine torque control method, the purpose of which is to control the engine torque through a four-wheel drive system to ensure the four-wheel drive performance of the vehicle.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an engine torque control method, comprising:

[0007] Collect data and determine whether the triggering conditions are met based on the collected data;

[0008] Once the vehicle meets the triggering conditions, the four-wheel drive torque control module sends a torque control request to the engine management system.

[0009] The engine management system will only perform torque control operation when it receives a valid torque control status and the torque control value output by the four-wheel drive torque control module is within the set range.

[0010] The collected data includes engine torque, engine speed, clutch speed difference of the four-wheel drive system, clutch torque, and clutch temperature.

[0011] The triggering conditions include basic triggering conditions and auxiliary triggering conditions. After the vehicle meets the basic triggering conditions and auxiliary triggering conditions, the four-wheel drive torque control module sends a torque control request to the engine management system.

[0012] The basic triggering condition is the speed difference of the clutch in the four-wheel drive system, and the auxiliary triggering condition is the temperature threshold of the clutch in the four-wheel drive system.

[0013] When the clutch speed difference of the four-wheel drive system reaches the high speed difference threshold and the clutch temperature of the four-wheel drive system is lower than the temperature threshold, the four-wheel drive torque control module sends a torque control request to the engine management system.

[0014] When the clutch speed difference of the four-wheel drive system reaches the low speed difference threshold and the clutch temperature of the four-wheel drive system is higher than the temperature threshold, the four-wheel drive torque control module sends a torque control request to the engine management system, where the low speed difference threshold is less than the high speed difference threshold.

[0015] After calculating the torque value, the four-wheel drive torque control module sends a torque control request to the engine management system.

[0016] The present invention also provides a control system for implementing the engine torque control method, including a four-wheel drive torque control module, an engine management system, and multiple sensors, wherein the multiple sensors are used to collect data, and the four-wheel drive torque control module is connected to the engine management system and the multiple sensors.

[0017] The present invention also provides a vehicle including the aforementioned control system.

[0018] The present invention also provides a computer-readable storage medium storing computer-executable instructions for causing a computer to perform the engine torque control method described above.

[0019] The engine torque control method of the present invention can control the engine torque through the four-wheel drive system when the four-wheel drive system has a certain temperature and speed difference. This protects the clutch of the four-wheel drive system and extends the working time of the four-wheel drive system while ensuring the four-wheel drive performance of the vehicle and preserving sufficient vehicle traction. Attached Figure Description

[0020] Figure 1 This is a flowchart of the vector four-wheel drive control method for engine torque according to the present invention. Detailed Implementation

[0021] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the present invention. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. Rather, these embodiments are provided to make the disclosure of the present invention more thorough and complete.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated with those skilled in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] like Figure 1 As shown, the present invention provides an engine torque control method, comprising:

[0024] Collect data and determine whether the triggering conditions are met based on the collected data;

[0025] Once the vehicle meets the triggering conditions, the four-wheel drive torque control module sends a torque control request to the engine management system.

[0026] The engine management system will only perform torque control operation when it receives a valid torque control status and the torque control value output by the four-wheel drive torque control module is within the set range.

[0027] The collected data includes engine torque, engine speed, clutch speed difference of the four-wheel drive system, clutch torque, and clutch temperature.

[0028] The triggering conditions include basic triggering conditions and auxiliary triggering conditions. After the vehicle meets the basic triggering conditions and auxiliary triggering conditions, the four-wheel drive torque control module sends a torque control request to the engine management system.

[0029] The basic triggering condition is the speed difference of the clutch in the four-wheel drive system, and the auxiliary triggering condition is the temperature threshold of the clutch in the four-wheel drive system.

[0030] When the clutch speed difference of the four-wheel drive system reaches the high speed difference threshold and the clutch temperature of the four-wheel drive system is lower than the temperature threshold, the four-wheel drive torque control module sends a torque control request to the engine management system.

[0031] When the clutch speed difference of the four-wheel drive system reaches the low speed difference threshold and the clutch temperature of the four-wheel drive system is higher than the temperature threshold, the four-wheel drive torque control module sends a torque control request to the engine management system, where the low speed difference threshold is less than the high speed difference threshold.

[0032] After calculating the torque value, the four-wheel drive torque control module sends a torque control request to the engine management system.

[0033] The present invention also provides a control system for implementing the engine torque control method, including a four-wheel drive torque control module, an engine management system, and multiple sensors, wherein the multiple sensors are used to collect data, and the four-wheel drive torque control module is connected to the engine management system and the multiple sensors.

[0034] The present invention also provides a vehicle including the aforementioned control system.

[0035] The present invention also provides a computer-readable storage medium storing computer-executable instructions for causing a computer to perform the engine torque control method described above.

[0036] Example

[0037] Firstly, such as Figure 1 As shown, an embodiment of the present invention provides an engine torque control method, including the following steps:

[0038] S1. Collect data and determine whether the triggering conditions are met based on the collected data;

[0039] S2. When the vehicle meets the triggering conditions, the four-wheel drive torque control module sends a torque control request to the engine management system (EMS).

[0040] S3. The engine management system will only perform torque control operation if the torque control status received by the engine management system is valid and the torque control value output by the four-wheel drive torque control module is within the set range.

[0041] Specifically, the present invention provides a method for controlling engine torque in a vector four-wheel drive system. Under certain temperature and speed differences in the four-wheel drive system, the torque of the engine is controlled by the four-wheel drive system. This protects the clutch of the four-wheel drive system, extends the working time of the four-wheel drive system, and preserves sufficient vehicle off-road capability.

[0042] In step S1 above, the collected data includes engine torque, engine speed, four-wheel drive system clutch speed difference, clutch torque, and clutch temperature. The engine torque signal can be collected by a torque sensor. The engine speed signal can be collected by a speed sensor. The four-wheel drive system clutch speed difference signal can be collected by a speed sensor. The four-wheel drive system clutch torque signal can be collected by a torque sensor. The four-wheel drive system clutch temperature signal can be collected by a temperature sensor.

[0043] In step S2 above, the triggering conditions include basic triggering conditions and auxiliary triggering conditions. After the vehicle meets the basic triggering conditions and auxiliary triggering conditions, the four-wheel drive torque control module sends a torque control request to the engine management system, but still retains sufficient vehicle off-road capability.

[0044] In step S2 above, the basic triggering condition is the speed difference of the clutch in the four-wheel drive system, and the auxiliary triggering condition is the temperature threshold of the clutch in the four-wheel drive system.

[0045] In step S2 above, when the speed difference of the four-wheel drive system clutch reaches the high speed difference threshold and the temperature of the four-wheel drive system clutch is lower than the temperature threshold, the four-wheel drive torque control module sends a torque control request to the engine management system.

[0046] In step S2 above, when the clutch speed difference of the four-wheel drive system reaches the low speed difference threshold and the clutch temperature of the four-wheel drive system is higher than the temperature threshold, the four-wheel drive torque control module sends a torque control request to the engine management system, and the low speed difference threshold is less than the high speed difference threshold.

[0047] In step S2 above, after the vehicle meets the triggering conditions, the four-wheel drive torque control module calculates the torque value and sends a torque control request to the engine management system.

[0048] In this embodiment of the invention, after being triggered, the method will output a torque control state effective value signal and a torque control value signal. The output of the torque control value is calculated and output according to the four-wheel drive torque control module.

[0049] In step S3 above, the engine management system will only perform torque control operation when the engine management system receives a valid torque control status and the output torque control value is within the range.

[0050] In this embodiment of the invention, the high-speed difference threshold, low-speed difference threshold, and temperature threshold are calibrated values. To ensure the vehicle's off-road performance after torque control, these three thresholds are calibrated to allow for temperature rise and speed difference under certain conditions, fully utilizing the increased adhesion coefficient brought about by the slip ratio under low-adhesion conditions.

[0051] In this embodiment of the invention, the torque value is a calculated value, determined by the torque control module. By calculating the overall vehicle adhesion coefficient, front and rear axle loads, and load transfer, the front and rear axle adhesion limits of the vehicle are obtained.

[0052] The calculation process for the overall vehicle adhesion coefficient is as follows:

[0053] The wheel-ground adhesion coefficient can be divided into: adhesion coefficient μa and adhesion coefficient margin μm;

[0054] Expression: μ = μa + μm;

[0055] The resultant force of the tires acting on the vehicle is

[0056] Using the adhesion coefficient as

[0057] Establish the function μm = f(Δγ);

[0058] Estimated value of road surface adhesion coefficient:

[0059] Among them, a x Let a be the longitudinal acceleration of the vehicle. y This refers to the vehicle's lateral acceleration.

[0060] According to the two-degree-of-freedom vehicle model, the nonlinearity is actually represented by the difference between the two equivalent front wheel steering angles:

[0061] Δγ=δ mon -δf;

[0062] Where, δ mon For nominal lateral angle,

[0063] δf is the actual yaw angle.

[0064] The corresponding front wheel steering angle is calculated using a two-degree-of-freedom vehicle model:

[0065]

[0066] When the equivalent deflection angle is small, the adhesion margin is large; when the equivalent deflection angle is large, the adhesion margin is small. The two are basically linearly related.

[0067] Instant torque distribution:

[0068] Based on parameters such as gradient and current acceleration, the axle load transfer between the front and rear axles of the vehicle is calculated, and torque distribution is implemented accordingly. The axle load and torque distribution ratio are calculated as follows:

[0069] Front axle load: F zf =mgcosαL r -m(gsinα+a)h g

[0070] Rear axle load: F zr = [m(gsinα+a)h g +mgcosαL f ] / L

[0071] Front and rear axle torque distribution ratio = F zf / F zr

[0072] Among them, F zf For the front axle vertical load, Fzr The vertical load is denoted as mg, where mg is the mass of the vehicle, g represents gravitational acceleration, mg is the weight of the vehicle, α is the road gradient, and L is the vertical load on the rear axle. f L is the distance from the vehicle's center of gravity to the front wheel. r The distance from the vehicle's center of gravity to the rear wheel, where L is the wheelbase, a is the vehicle's longitudinal acceleration, and hg is the height of the vehicle's center of gravity.

[0073] It is important to note that the rear axle needs to take into account the clutch capacity of the four-wheel drive system, and the smaller value should be used. The sum of the front axle torque and the rear axle torque of the vehicle is divided by the vehicle's transmission ratio to obtain the engine torque under maximum adhesion, which is the control torque value.

[0074] In a second aspect, embodiments of the present invention also provide a control system for implementing the above-described engine torque control method, including a four-wheel drive torque control module, an engine management system, and multiple sensors, wherein the multiple sensors are used to collect data, and the four-wheel drive torque control module is connected to the engine management system and the multiple sensors.

[0075] In this embodiment of the invention, the multiple sensors include a first torque sensor, a second torque sensor, a first speed sensor, a second speed sensor, and a temperature sensor. The first torque sensor is used to collect the engine torque value, the second torque sensor is used to collect the clutch torque value of the four-wheel drive system, the first speed sensor is used to collect the engine speed value, the second speed sensor is used to collect the clutch speed value of the four-wheel drive system, and the temperature sensor is used to collect the clutch temperature of the four-wheel drive system.

[0076] In a third aspect, embodiments of the present invention also provide a vehicle including a control system with the above-described structure.

[0077] In this embodiment of the invention, the vehicle is a four-wheel drive vehicle with a four-wheel drive system.

[0078] In a fourth aspect, embodiments of the present invention also provide a computer-readable storage medium storing computer-executable instructions for causing a computer to perform the above-described engine torque control method.

[0079] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0080] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0081] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. An engine torque control method, characterized in that, include: S1. Collect data and determine whether the triggering conditions are met based on the collected data; S2. When the vehicle meets the triggering conditions, the four-wheel drive torque control module sends a torque control request to the engine management system. S3. The engine management system will only perform torque control operation when it receives a valid torque control status and the torque control value output by the four-wheel drive torque control module is within the set range. In step S1, the collected data includes engine torque, engine speed, four-wheel drive system clutch speed difference, clutch torque, and clutch temperature; the engine torque signal is collected by a torque sensor; the engine speed signal is collected by a speed sensor; the four-wheel drive system clutch speed difference signal is collected by a speed sensor; the four-wheel drive system clutch torque signal is collected by a torque sensor; and the four-wheel drive system clutch temperature signal is collected by a temperature sensor. In step S2, the triggering conditions include basic triggering conditions and auxiliary triggering conditions. After the vehicle meets the basic triggering conditions and auxiliary triggering conditions, the four-wheel drive torque control module sends a torque control request to the engine management system, but still retains the vehicle's off-road capability. In step S2, the basic triggering condition is the speed difference of the four-wheel drive system clutch, and the auxiliary triggering condition is the temperature threshold of the four-wheel drive system clutch. In step S2, when the speed difference of the four-wheel drive system clutch reaches the high speed difference threshold and the temperature of the four-wheel drive system clutch is lower than the temperature threshold, the four-wheel drive torque control module sends a torque control request to the engine management system. In step S2, when the clutch speed difference of the four-wheel drive system reaches the low speed difference threshold and the clutch temperature of the four-wheel drive system is higher than the temperature threshold, the four-wheel drive torque control module sends a torque control request to the engine management system. The low speed difference threshold is less than the high speed difference threshold. In step S2, after the vehicle meets the triggering conditions, the four-wheel drive torque control module calculates the torque value and sends a torque control request to the engine management system. After triggering, it outputs the torque control status valid value signal and the torque control value signal. The output of the torque control value is based on the calculation of the four-wheel drive torque control module. In step S3, the engine management system will perform torque control operation only when the torque control status is received as a valid value and the output torque control value is within the range. The torque value is a calculated value, calculated by the torque control module; by calculating the vehicle's adhesion coefficient, front and rear axle loads and load transfer, the front and rear axle adhesion limits of the vehicle are obtained; The calculation process for the overall vehicle adhesion coefficient is as follows: The wheel-ground adhesion coefficient is divided into: adhesion coefficient μa and adhesion coefficient margin μm; Expression: μ = μa + μm; The resultant force of the tires acting on the vehicle is Using the adhesion coefficient as Establish the function μm = f(Δγ); Estimated value of road surface adhesion coefficient: Among them, a x Let a be the longitudinal acceleration of the vehicle. y This refers to the vehicle's lateral acceleration. According to the two-degree-of-freedom vehicle model, the nonlinearity is actually represented by the difference between the two equivalent front wheel steering angles: Δγ=δ mon -δf; Where, δ mon For nominal lateral angle, δf is the actual yaw angle. The corresponding front wheel steering angle is calculated using a two-degree-of-freedom vehicle model: Instant torque distribution: Based on parameters such as gradient and current acceleration, the axle load transfer between the front and rear axles of the vehicle is calculated, and torque distribution is achieved accordingly; the axle load and torque distribution ratio are calculated as follows: Front axle load: F zf =mgcosαL r -m(gsinα+a)h g Rear axle load: F zr = [m(gsinα+a)h g +mgcosαL f ] / L Front and rear axle torque distribution ratio = F zf / F zr Among them, F zf For the front axle vertical load, F zr The vertical load is denoted as mg, where mg is the mass of the vehicle, g represents gravitational acceleration, mg is the weight of the vehicle, α is the road gradient, and L is the vertical load on the rear axle. f L is the distance from the vehicle's center of gravity to the front wheel. r The distance from the vehicle's center of gravity to the rear wheel, where L is the wheelbase, a is the vehicle's longitudinal acceleration, and hg is the height of the vehicle's center of gravity.

2. The engine torque control method according to claim 1, characterized in that, The collected data includes engine torque, engine speed, clutch speed difference of the four-wheel drive system, clutch torque, and clutch temperature.

3. The engine torque control method according to claim 1, characterized in that, The triggering conditions include basic triggering conditions and auxiliary triggering conditions. After the vehicle meets the basic triggering conditions and auxiliary triggering conditions, the four-wheel drive torque control module sends a torque control request to the engine management system.

4. The engine torque control method according to claim 3, characterized in that, The basic triggering condition is the speed difference of the clutch in the four-wheel drive system, and the auxiliary triggering condition is the temperature threshold of the clutch in the four-wheel drive system.

5. The engine torque control method according to claim 4, characterized in that, When the clutch speed difference of the four-wheel drive system reaches the high speed difference threshold and the clutch temperature of the four-wheel drive system is lower than the temperature threshold, the four-wheel drive torque control module sends a torque control request to the engine management system.

6. The engine torque control method according to claim 4, characterized in that, When the clutch speed difference of the four-wheel drive system reaches the low speed difference threshold and the clutch temperature of the four-wheel drive system is higher than the temperature threshold, the four-wheel drive torque control module sends a torque control request to the engine management system, where the low speed difference threshold is less than the high speed difference threshold.

7. The engine torque control method according to any one of claims 1 to 6, characterized in that, After calculating the torque value, the four-wheel drive torque control module sends a torque control request to the engine management system.

8. A control system implementing the engine torque control method according to any one of claims 1 to 7, characterized in that, It includes a four-wheel drive torque control module, an engine management system, and multiple sensors. The multiple sensors are used to collect data, and the four-wheel drive torque control module is connected to the engine management system and the multiple sensors.

9. A vehicle, characterized in that, Includes the control system described in claim 8.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions for causing a computer to perform the engine torque control method according to any one of claims 1 to 7.

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