Abstract
With the development of modern control theory and microelectronics technology, electric power steering system (EPS) has become a focal point of research in the vehicle engineering field in recent years. This paper proposes a new ideal characteristic curve that can be applied to the EPS. The characteristic curve should be straight when the steering angle is small. When the angle is larger than a special value, the quadratic curve, the tangent slope of which is larger than before, should be chosen. And this paper gives us the basic algorithm for the new characteristic curve. The working principle and the characteristics of the electric power steering system have been analyzed in detail, and a three dimensional map of power assisted characteristic curve is drawn in this paper. It provides the basis for the software design of electric control unit. Through the analysis of the steering control of vehicles, the requirements and characteristics of the drivers and the basic characteristics of the assisting requirements will be determined.
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