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A vehicle four-wheel drive control method and electronic device

A control method and vehicle technology, applied in the direction of the control device, etc., can solve the problems of pitch angle change, passenger discomfort, etc., and achieve the effect of improving ride comfort and reducing vehicle pitch.

Active Publication Date: 2022-04-26
DONGFENG MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Based on this, it is necessary to provide a vehicle four-wheel drive control method and electronic equipment for the technical problem that the four-wheel drive control technology of the prior art will cause the pitch angle of the vehicle to change when the vehicle accelerates, causing discomfort to passengers.

Method used

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  • A vehicle four-wheel drive control method and electronic device
  • A vehicle four-wheel drive control method and electronic device
  • A vehicle four-wheel drive control method and electronic device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Such as image 3 Shown is a working flow chart of a vehicle four-wheel drive control method according to an embodiment of the present invention, including:

[0067] Step S301, acquiring the driving force of the vehicle as the current driving force;

[0068] Step S302, obtaining the front axle displacement function of the vehicle's front axle displacement relative to the torque distribution proportional coefficient and the driving force, and the vehicle's rear axle displacement relative to the torque distribution proportional coefficient and the rear wheel displacement function of the driving force, the torque proportional coefficient defines the vehicle Drive torque is distributed to the front wheels with front-wheel drive torque and to the rear wheels with rear-wheel drive torque;

[0069] Step S303, establishing an objective function, the objective function being the absolute value of the difference between the front wheel displacement function and the rear wheel dis...

Embodiment 2

[0081] Such as Figure 5 Shown is a work flow chart of a vehicle four-wheel drive control method according to the second embodiment of the present invention. The vehicle is an engine-driven vehicle, and the front axle and rear axle of the vehicle are coupled through a coupler. The method includes:

[0082] Step S501, monitor the current vehicle speed and the current accelerator opening of the vehicle, if the current vehicle speed is less than or equal to the preset vehicle speed threshold, and the current accelerator opening is greater than or equal to the preset opening threshold, switch the vehicle to the four-wheel drive mode and execute Step S502, otherwise end;

[0083] Step S502, acquiring the driving force of the vehicle as the current driving force;

[0084] Step S503, obtaining the front axle displacement function of the vehicle's front axle displacement relative to the torque distribution proportional coefficient and the driving force, and the vehicle's rear axle di...

Embodiment 3

[0101] Such as Figure 6 Shown is a working flow chart of a vehicle four-wheel drive control method according to the third embodiment of the present invention. The vehicle is a motor-driven vehicle, the front axle of the vehicle is driven by a front axle motor, and the rear axle of the vehicle is driven by a rear axle motor driven, the method comprising:

[0102] Step S601, monitor the current vehicle speed and the current accelerator opening of the vehicle, if the current vehicle speed is less than or equal to the preset vehicle speed threshold, and the current accelerator opening is greater than or equal to the preset opening threshold, switch the vehicle to the four-wheel drive mode and execute Step S602, otherwise end;

[0103] Step S602, acquiring the driving force of the vehicle as the current driving force;

[0104] Step S603, obtaining the front axle displacement function of the vehicle's front axle displacement relative to the torque distribution proportional coeffi...

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Abstract

The invention discloses a vehicle four-wheel drive control method and electronic equipment. The method includes: obtaining the driving force of the vehicle as the current driving force; obtaining the front wheel displacement function of the vehicle's front axle displacement with respect to the torque distribution proportional coefficient and the driving force, and the vehicle's Rear axle displacement Rear wheel displacement function with respect to the torque distribution proportional coefficient and driving force, the torque proportional coefficient defines the front wheel drive torque distributed to the front wheels and the rear wheel drive torque distributed to the rear wheels; establish the objective function, the objective function is the absolute value of the difference between the front wheel displacement function and the rear wheel displacement function; calculate the torque distribution proportional coefficient that minimizes the value of the objective function under the current driving force as the selected torque distribution proportional coefficient; control the vehicle using the selected torque The distribution ratio factor distributes the front-wheel drive torque and the rear-wheel drive torque. The invention distributes the driving torque of the front and rear wheels, thereby reducing vehicle pitch and improving riding comfort.

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] Passenger car four-wheel drive technology means that the vehicle maintains four-wheel drive during driving, and the output torque of the engine is distributed to the front and rear axles in a fixed ratio. And in order to reduce oil consumption, prior art has proposed timely four-wheel drive. Timely four-wheel drive control The vehicle switches between two-wheel drive and four-wheel drive. On normal roads, the vehicle runs in two-wheel drive mode. When encountering off-road roads or wheel slippage, it switches to four-wheel drive mode and distributes power to the other two wheels. [0003] However, the existing four-wheel drive technology for passenger cars generally enters the four-wheel drive mode only when there is a speed difference between the front and rear wheels (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60W30/18B60W30/182B60W50/00
CPCB60W30/18B60W30/182B60W50/00B60W2050/0019B60W2720/40B60W2720/403
Inventor 赵旭李明华张吉忠李康宁张琪林
Owner DONGFENG MOTOR CO LTD