Engine torque control method and system, vehicle and storage medium

Abstract

The invention discloses an engine torque control method which comprises the following steps: acquiring data, and judging whether a triggering condition is met or not according to the acquired data; when the whole vehicle meets the triggering condition, the four-wheel-drive torque control module sends a torque control request to an engine management system; when the engine management system receives that the torque control state is an effective value and the torque control value output by the four-wheel drive torque control module is within a set range, the engine management system can perform torque control operation. According to the engine torque control method, the torque of the engine can be controlled through the four-wheel-drive system under the condition that the four-wheel-drive system has certain temperature and speed difference, the four-wheel-drive performance of the vehicle is ensured while a clutch of the four-wheel-drive system is protected and the working time of the four-wheel-drive system is prolonged, and the enough whole vehicle escape performance is reserved. The invention further discloses a control system for implementing the engine torque control method, a vehicle and a computer readable storage medium.

Description

Technical Field

[0001] The present invention belongs to the field of automobile technology, and in particular, relates to an engine torque control method, a control system, a vehicle and a storage medium. Background Art

[0002] When the vehicle is on a split road, split slope, single rear wheel escape, or other conditions where the front axle has poor adhesion or only one side of the rear axle has good adhesion, the excessive residual power output of the engine will cause the four-wheel drive clutch plate to be subjected to high torque and high speed difference. At this time, high power heating will cause the transmission four-wheel drive clutch to overheat early, wear too quickly, and affect the four-wheel drive performance. In severe cases, it will cause the four-wheel drive system clutch to wear out and fail, and the four-wheel drive function will be lost.

[0003] Current four-wheel drive models rely solely on the TCS (Traction Control System) and other functions of the braking system to suppress the speed difference or torque under this condition, and cannot adjust themselves. The effect is not ideal, and it is easy to cause the four-wheel drive system to overheat and wear out too quickly. Although the four-wheel drive system has an overheating protection function, it will disconnect the four-wheel drive clutch for heat dissipation. However, this strategy will cause the vehicle to lose the four-wheel drive function, resulting in reduced vehicle performance and the vehicle being unable to escape.

[0004] It is hoped to provide an improved engine torque control method, particularly how to control the engine torque through a four-wheel drive system when the four-wheel drive system has a certain temperature and speed difference, while protecting the four-wheel drive system clutch and extending the working time of the four-wheel drive system, while retaining sufficient vehicle escape performance. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present 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] In order to solve the above technical problems, the technical solution adopted by the present invention is: an engine torque control method, comprising:

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

[0008] When 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 perform torque control operations only when the torque control status received by the engine management system is a valid value 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, four-wheel drive system clutch speed difference, clutch torque and clutch temperature.

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

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

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

[0014] When the four-wheel drive system clutch speed difference reaches a low speed difference threshold and the four-wheel drive system clutch temperature is higher than a 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.

[0015] After the four-wheel drive torque control module calculates 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, 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, comprising the control system.

[0018] The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the engine torque control method.

[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, thereby ensuring the four-wheel drive performance of the vehicle and retaining sufficient vehicle escape performance while protecting the four-wheel drive system clutch and extending the working time of the four-wheel drive system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a flow chart of the method for controlling engine torque by vector four-wheel drive of the present invention. DETAILED DESCRIPTION

[0021] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly connected by technicians in the technical field to which the present invention belongs. The terminology used in the specification of the present invention is for the purpose of describing specific embodiments and is not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related 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 trigger conditions are met based on the collected data;

[0025] When 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 perform torque control operations only when the torque control status received by the engine management system is a valid value 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, four-wheel drive system clutch speed difference, clutch torque and clutch temperature.

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

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

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

[0031] When the four-wheel drive system clutch speed difference reaches a low speed difference threshold and the four-wheel drive system clutch temperature is higher than a 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.

[0032] After the four-wheel drive torque control module calculates 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, 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, comprising the control system.

[0035] The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the engine torque control method.

[0036] Example

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

[0038] S1. Collect data and determine whether the trigger condition is met based on the collected data;

[0039] S2: The vehicle meets the triggering conditions, and 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 perform torque control operation only when the torque control state received by the engine management system is a valid value and the torque control value output by the four-wheel drive torque control module is within the set range.

[0041] Specifically, an embodiment of the present invention provides a method for controlling engine torque by a vector four-wheel drive. When the four-wheel drive system has a certain temperature and speed difference, the engine torque is controlled through the four-wheel drive system, thereby protecting the four-wheel drive system clutch, extending the working time of the four-wheel drive system, and retaining sufficient vehicle escape performance.

[0042] In the above 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 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 the above step S2, the trigger conditions include basic trigger conditions and auxiliary trigger conditions. After the vehicle meets the basic trigger conditions and the auxiliary trigger conditions, the four-wheel drive torque control module sends a torque control request to the engine management system, but still retains sufficient vehicle escape performance.

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

[0045] In the above step S2, when the four-wheel drive system clutch speed difference reaches the high speed difference threshold and the four-wheel drive system clutch temperature 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 the above step S2, when the four-wheel drive system clutch speed difference reaches the low speed difference threshold and the four-wheel drive system clutch temperature 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 the above step S2, after the vehicle meets the triggering conditions, the four-wheel drive torque control module calculates the torque value, and the four-wheel drive torque control module sends a torque control request to the engine management system.

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

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

[0050] In the embodiment of the present invention, the high speed difference threshold, the low speed difference threshold, and the temperature threshold are calibrated values. In order to ensure the vehicle's escape performance after torque control, these three thresholds will be calibrated to allow temperature rise and speed difference to occur under certain conditions, making full use of the improvement in adhesion coefficient brought by the slip rate under low adhesion conditions.

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

[0052] The calculation process of vehicle adhesion coefficient is as follows:

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

[0054] Expression: μ = μa + μm;

[0055] The resultant force on the vehicle's tires is

[0056] Using the adhesion coefficient

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

[0058] Estimated road adhesion coefficient:

[0059] Among them, a x is the longitudinal acceleration of the vehicle, a y is the vehicle lateral acceleration;

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

[0061] Δγ=δ mon -δf;

[0062] Among them, δ mon is the nominal yaw angle,

[0063] δf is the actual yaw angle,

[0064] According to the two-degree-of-freedom vehicle model, the corresponding front wheel turning angle is calculated:

[0065]

[0066] When the equivalent rotation angle deviation is small, the attachment margin is large, and when the equivalent deflection angle is large, the attachment margin is small. The two are basically in a linear relationship.

[0067] Instant torque distribution:

[0068] According to the slope value and current acceleration and other parameters, the axle load transfer of the vehicle's front and rear axles is calculated, and the torque distribution is achieved accordingly. The calculation of the axle load and torque distribution ratio is 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 is the vertical load on the front axle, Fzr is the vertical load on the rear axle, mg is the mass of the vehicle, g represents the acceleration of gravity, mg is the gravity of the vehicle, α is the road slope value, L f is the distance from the vehicle's center of mass to the front wheel, L r The distance from the vehicle's center of mass to the rear wheel, 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 should be noted that the rear axle needs to consider the clutch capacity of the four-wheel drive system, and the smaller value of the two is taken. The sum of the front axle torque and the rear axle torque of the vehicle is divided by the transmission system speed ratio of the vehicle to obtain the engine torque under maximum adhesion, which is the torque control value.

[0074] In the second aspect of the present invention, an embodiment of the present invention also provides a control system for implementing the above-mentioned engine torque control method, including 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 multiple sensors.

[0075] In an embodiment of the present 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 four-wheel drive system clutch torque value, the first speed sensor is used to collect the engine speed value, the second speed sensor is used to collect the four-wheel drive system clutch speed value, and the temperature sensor is used to collect the four-wheel drive system clutch temperature.

[0076] In a third aspect of the present invention, an embodiment of the present invention further provides a vehicle, comprising a control system of the above structure.

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

[0078] In a fourth aspect of the present invention, an embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the above-mentioned engine torque control method.

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

[0080] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed method above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or a non-transitory medium) and a communication medium (or a temporary medium). As known to those skilled in the art, the term computer storage medium 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 include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0081] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An engine torque control method, characterized in that: include: Collect data, and determine whether the trigger conditions are met based on the collected data; When 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 perform torque control operations only when the torque control status received by the engine management system is a valid value and the torque control value output by the four-wheel drive torque control module is within the set range.

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

3. The engine torque control method according to claim 1, characterized in that: The trigger conditions include basic trigger conditions and auxiliary trigger conditions. After the vehicle meets the basic trigger conditions and the auxiliary trigger 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 trigger condition is the clutch speed difference of the four-wheel drive system, and the auxiliary trigger condition is the clutch temperature threshold of the four-wheel drive system.

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

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

8. A control system for 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. The four-wheel drive torque control module is connected to the engine management system and 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, and the computer-executable instructions are used to enable a computer to execute the engine torque control method described in any one of claims 1 to 7.

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