A method of protecting electric power steering system

Abstract

The invention provides a method for protecting an electric power steering system. The method includes the following steps that a corresponding relation between steering wheel turn angles and a steering wheel revolving speed threshold value is built to form a steering wheel revolving speed threshold value look-up table; the steering wheel turn angles and steering wheel revolving speeds are acquired; a rate change value is set, rate processing is conducted on the acquired steering wheel turn angles according to the rate change value, and then a steering wheel reference turn angle is acquired; a steering wheel turn angle corresponding to the steering wheel reference turn angle is looked up in the revolving speed threshold value look-up table, and then a steering wheel revolving speed threshold value corresponding to the steering wheel reference turn angle is acquired; a current steering wheel revolving speed and the acquired steering wheel revolving speed threshold value are compared, and whether the current steering wheel revolving speed is larger than the acquired steering wheel revolving speed threshold value or not is judged; if yes, a current torque limiting value is set as 0; if not, the torque limiting value is set as a number formed by multiplying the difference of the steering wheel revolving speed threshold value and the steering wheel revolving speed by a correction coefficient smaller than 1, wherein the correction coefficient can be calibrated. According to the method, the EPS system can be effectively protected.

Description

technical field [0001] The invention relates to the technical field of automobile steering, in particular to a method for protecting an electric power steering system. Background technique [0002] The electric power steering system is different from the traditional hydraulic power steering system and electronically controlled hydraulic power steering system. It does not require complicated hydraulic and mechanical control. It has many advantages such as energy saving, environmental protection and improved vehicle handling performance. It has attracted the attention of many scholars and has become The focus of research and development of modern automotive steering systems, electric steering is a power steering system that uses an electric motor to directly provide power assistance, and the power steering system is controlled by an electronic control unit (ECU). The torque sensor is connected with the steering shaft. When the steering shaft rotates, the sensor works and sends...

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a method for protecting the electric power steering system, which is used to solve the problem in the prior art when the steering wheel speed is relatively high and the system suddenly stops at the end of the mechanical stroke. The large impact on the EPS system may cause damage or failure of the EPS system

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