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Vehicle four-wheel drive control method and electronic device

A control method and vehicle technology, applied in control devices, vehicle parts, transportation and packaging, etc., can solve problems such as difficulty in starting, limiting the use time of the four-wheel drive system, and slow intervention of the four-wheel drive system, so as to avoid frequent intervention and prevent overheating Protect and eliminate the effect of speed difference

Active Publication Date: 2021-06-29
DONGFENG MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this control strategy improves the slippery feeling when starting with a large throttle on a good road, but for the working condition of starting with a small throttle on a bad road (such as ice), the four-wheel drive system intervenes slowly, resulting in difficulty in starting
[0006] ③ Some control strategies pursue drivability, so that the four-wheel drive system operates frequently, which cannot prevent the torque manager from heating up
This control strategy limits the use time of the four-wheel drive system and is not conducive to protecting the four-wheel drive hardware.

Method used

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  • Vehicle four-wheel drive control method and electronic device
  • Vehicle four-wheel drive control method and electronic device
  • Vehicle four-wheel drive control method and electronic device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Such as figure 1 Shown is a working flow chart of a vehicle four-wheel drive control method of the present invention, including:

[0068] Step S101, acquiring vehicle parameters;

[0069] Step S102, when the vehicle is running straight ahead, according to the vehicle parameters, determine whether the current mode is the throttle control mode or the rotational speed difference control mode;

[0070] Step S103, if the current mode is the throttle control mode, control the rear wheel torque according to the throttle opening, and if the current mode is the speed difference control mode, control the rear wheel torque according to the wheel speed difference between the front and rear wheels.

[0071] In particular, the present invention is preferably applied to an on-vehicle electronic control unit. The on-vehicle electronic control unit continues to execute step S101 to obtain vehicle parameters, and when the vehicle is running straight ahead, trigger step S102 to determin...

Embodiment 2

[0074] Such as figure 2 Shown is a working flow chart of a vehicle four-wheel drive control method according to the second embodiment of the present invention, including:

[0075] Step S201, acquiring vehicle parameters;

[0076] Step S202, when the steering angle of the vehicle is smaller than the preset steering angle threshold and the slope is smaller than the preset slope threshold, determine that the current mode is the throttle control mode or the speed difference control mode according to the current vehicle speed, the speed difference between the front and rear wheels, and the throttle opening;

[0077] Step S203, if the current vehicle speed is less than or equal to the first speed threshold, and the speed difference between the front and rear wheels is greater than the speed difference threshold corresponding to the current vehicle speed, then determine that the current mode is the speed difference control mode;

[0078] Step S204, if the current vehicle speed is l...

Embodiment 3

[0123] Such as Figure 12 Shown is a working flow chart of a vehicle four-wheel drive control method in the preferred embodiment of the present invention, including:

[0124] Step S1201, vehicle sensor & CAN signal acquisition;

[0125] Step S1202, signal processing;

[0126] Step S1203, if it is straight driving, identify the vehicle driving condition by the parameter "vehicle speed v / accelerator acc / front and rear wheel speed difference Δv", and then execute step S1206:

[0127] If it is a starting condition, the road surface is bad, the current vehicle speed v is less than the first speed threshold V1, and the speed difference Δv of the front and rear wheels is greater than the speed difference threshold corresponding to the current vehicle speed, then the torque is calculated according to the speed difference Δv;

[0128] If it is the starting condition, the road surface is good, the current vehicle speed v is less than the first speed threshold V1, and the speed differe...

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Abstract

The invention discloses a vehicle four-wheel drive control method and electronic equipment. The method includes: obtaining vehicle parameters; when the vehicle is running straight ahead, determining the current mode as the throttle control mode or the speed difference control mode according to the vehicle parameters; if the current mode is the throttle control mode mode, the rear wheel torque is controlled according to the throttle opening; if the current mode is speed difference control mode, the rear wheel torque is controlled according to the wheel speed difference between the front and rear wheels. According to the driving requirements of each working condition, the present invention clarifies the suitable working conditions of the two modes of throttle opening control and front-rear wheel rotational speed difference control respectively, and combines the advantages of the two modes. When starting and accelerating with a large throttle, it can effectively reduce the speed difference. Starting and driving at low throttle can effectively eliminate the speed difference. Avoid frequent intervention of the four-wheel drive system at high speeds, effectively preventing overheating protection of four-wheel drive components.

Description

technical field [0001] The invention relates to the technical field related to automobiles, in particular to a vehicle four-wheel drive control method and electronic equipment. Background technique [0002] The existing front-wheel-drive vehicle plus the mechanical four-wheel drive system forms a timely four-wheel drive vehicle, which monitors signals such as vehicle speed / accelerator opening / front and rear wheel speed difference / steering / gradient. Among them, when driving straight, it mainly monitors the vehicle speed, accelerator and speed difference to calculate the torque that should be distributed to the rear wheels to eliminate the speed difference. [0003] However, there are various deficiencies in the existing four-wheel drive control strategy under direct driving conditions: [0004] ① Some control strategies mainly control the torque of the rear wheels according to the speed difference between the front and rear wheels. However, in the conditions of large thrott...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60W30/18B60W30/182B60K17/34
CPCB60K17/34B60W30/18172B60W30/182
Inventor 张琪林王攀旭张吉忠孙加伟李康宁
Owner DONGFENG MOTOR CO LTD
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