Automotive Electric Power Steering System

Abstract

The invention relates to an automobile electric power steering system, which includes a worm gear box, a booster motor, a steering column, a steering shaft, an intermediate shaft, and a yoke; the worm gear box includes a box shell, an input shaft, an output shaft, and a Non-contact torque sensor, non-contact angle sensor, signal conditioning board, torsion bar, worm gear and worm screw inside the shell; non-contact torque sensor includes multi-stage magnet ring, yoke assembly and magnet ring assembly; non-contact The type rotation angle sensor includes a main gear and at least one pair of slave gears that are matched and meshed with the main gear; one end of the pair of slave gears is equipped with a horizontally magnetized permanent magnet; the signal conditioning board includes a conditioning board body and a ECU module, GMR sensor chip and Hall chip on the body and electrically connected to each other. The invention has simple and reasonable structural design, can effectively reduce noise, improve operating comfort, fast response speed, compact structure, long service life and easy maintenance.

Description

technical field [0001] The invention relates to the technical field of vehicle steering systems, in particular to an automobile electric power steering system. Background technique [0002] Electric Power Steering System (EPS) is a steering system that directly relies on the motor to provide assist torque. This system is different from the traditional hydraulic power steering system. It does not require complex mechanical and hydraulic control, but controls the magnitude and direction of the current of the assist motor according to the speed of the vehicle collected by the microprocessor and the magnitude of the driver's operating torque. Realize the purpose of assisting the steering wheel of the car. This method can provide sufficient freedom for the setting of steering characteristics, and can accurately realize the steering assistance required by people for different speeds and different turns preset by people, so that the driver can obtain a stronger sense of the road a...

AI Technical Summary

Problems solved by technology

[0004] The sensor used in the existing supporting EPS is a contact composite sensor. The contact sensor causes a lot of noise in the EPS; the sensor in the existing structure has low precision and large deviations in the collected signals, resulting in slow response of the EPS and poor handling of the driver. The comfort performance is low; the sensor structure of the existing structure is complex and the volume is large, and there are many restrictions on the layout of the EPS body; the sensor of the existing structure is mainly contact type, and pitting wear occurs during the use of EPS. Reduce the service life of the EPS assembly and make subsequent maintenance difficult

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