Electric power steering system

Details Electric power steering system Electric power steering system

1996-11-27

1999-05-18

Oberleitner, Robert J.

Motor vehicles

Steering gear

With electric power assist

180446, 701 41, B62D5/04

Patent

active

059042230

ABSTRACT:
In an electric power steering system, a road surface reaction applied to a steering mechanism is estimated from a voltage and an electric current applied to an electric actuator, and a steering torque. Because the road surface reaction provides a useful data for assessing the condition of the road surface, it is possible to optimally control various control systems which depends on the condition of the road surface. In particular, a frictional coefficient between a road surface and a tire of the vehicle can be estimated according to a steering angle and the road surface reaction, for instance by comparing the estimated road surface reaction with a reference road surface reaction which is computed from a set of standard conditions. Thus, the road surface reaction and the road frictional coefficient can be obtained during a normal steering action by using functions which are normally provided in the electric power steering system. By knowing the current road surface condition, an optimum steering assist action can be executed according to each particular road surface condition, and can substantially reduce the effort required by the vehicle operator to steer the vehicle under all conditions.

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