Electric power steering system and control method thereof

Abstract

The invention provides an electric power steering system and control method thereof, and belongs to the field of vehicles. The electric power steering system comprises a human drive system, an electric power steering, a controller and a wheel drive system; the human drive system is used for input and transmission of human torque; the electric power steering comprises an input shaft and an output shaft, wherein the input shaft of the electric power steering is integrated with a driving motor and a torque and position sensor, the output torque of the driving motor and the human torque jointly act on the input shaft of the electric power steering; the controller is used for controlling the driving motor according to the signals of the torque and position sensor and the vehicle control unit; the wheel drive system is connected to the output shaft of the electric power steering, and is used for transmission of the output torque of the electric power steering, so that the steering action iscompleted. According to the electric power steering system, the driving motor and the torque and position sensor are integrated into the input shaft of the electric power steering, therefore, the meter beam structure does not need changing, and the electric power steering system has a good universality.

Description

technical field [0001] The invention relates to the field of vehicles, in particular to an electric power steering system and a control method thereof. Background technique [0002] The recirculating ball electric power steering system has the advantages of high efficiency, energy saving, low speed and lightness, and has been widely used in the field of small vehicles. [0003] Currently, for MPVs, pickup trucks, large SUVs, and commercial vehicles with large front axle loads, in order to use recirculating ball electric power steering systems, rack and pinion steering gears are usually directly replaced with recirculating ball steering gears. [0004] However, such a structure often needs to install parts such as a drive motor, a sensor, and a bracket at the steering column, so the structure of the instrument crossbeam needs to be changed during installation. Contents of the invention [0005] An object of the present invention is to provide an electric power steering sys...

AI Technical Summary

Problems solved by technology

[0004] However, this structure often requires the installation of drive motors, sensors, brackets and other parts at the steering column, so the structure of the instrument beam needs to be changed during installation.

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