A differential torque power steering system for automobile drive axle and its control method

Abstract

The invention discloses a differential torque power-assisted steering system used for a vehicle driving axle and a control method of the differential torque power-assisted steering system. A detection mechanism collects steering wheel rotating angle information, steering wheel rotating torque information, wheel speed information, battery voltage information and battery current information, and transmits the information to an electronic control unit; a working mode selection unit allows a driver to select different working modes of the differential torque power-assisted steering system, and transmits the working mode information to the electronic control unit; the electronic control unit controls switching of the working modes and controls an electromagnetic clutch, auxiliary motors and brakes of an execution mechanism to work according to the received information; and the auxiliary motors connected with left and right semi-shafts of the drive axle and the brakes arranged on driving wheels on the left and right sides are utilized, the driving wheels on the left and right sides have different driving torque or braking torque, and the vehicle produces an yaw moment to assist the driver to turn, so that force applied on a steering wheel by the driver is reduced, differential torque power-assisted steering is achieved, and the good steering handing feeling is provided for the driver.

Description

technical field [0001] The invention belongs to the technical field of automobiles, and specifically relates to a differential torque power steering system and a control method thereof for automobile driving axles. Background technique [0002] The steering system of a car is a set of special mechanisms used to change or restore the driving direction of the car. Its function is to ensure that the car can be turned according to the will of the driver. The performance of the car steering system will directly affect the handling stability and safety of the car. sex. At present, the power steering system is generally used to improve the steering performance of the car. The power steering system is a steering system that uses both the driver's physical strength and external power as the steering energy. It is produced to meet people's requirements for driving convenience. When the driver operates the steering of the vehicle, under the action of the power steering system, the dri...

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Problems solved by technology

The power assist characteristics of the mechanical hydraulic power steering system cannot be adjusted, and the oil pump is still working regardless of whether the vehicle is turning or not, and the energy consumption is high; the electronic hydraulic power steering system is based on the mechanical hydraulic power steering system. Drive the oil pump, reduce energy consumption, and can realize the adjustment of power assist characteristics, and meet the power requirements of the vehicle at high speed and low speed at the same time, but still cannot completely solve the shortcomings of the hydraulic power steering system, and because the original hydraulic power steering system The electronic control system is added to make its structure more complex; the electric power steering system directly provides steering assistance by the electric motor, and the electric motor only works when the vehicle is turning, reducing energy consumption. The electric power steering system can also improve the steering assist characteristics of the vehicle. And has the advantages of less parts, light weight, compact structure and easy matching

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