초록 ▼

In a vehicle steering control system, an actuating torque is applied to steerable wheels according to a steering torque applied to a steering wheel in a conventional manner, and an additional actuating torque is applied to the steering wheel by an electric motor according to lateral dynamic conditio

In a vehicle steering control system, an actuating torque is applied to steerable wheels according to a steering torque applied to a steering wheel in a conventional manner, and an additional actuating torque is applied to the steering wheel by an electric motor according to lateral dynamic conditions of the vehicle so as to control the lateral stability of the vehicle even in the presence of external interferences such as crosswind. Such external interferences are detected as a lateral dynamic condition of the vehicle such as the yaw rate of the vehicle, and the steering control system produces a steering reaction which counteracts such a lateral dynamic condition by applying the additional actuating torque to the steerable wheels so that the vehicle may maintain a straight course in spite of such external interferences without requiring any intentional efforts by the vehicle operator. In particular, by suppressing the additional actuating torque in an understeer condition, the handling of the vehicle can be improved.

대표청구항 ▼

[ What we claim is:] [1.] A vehicle steering control system, comprisingsteering torque input means;powered steering control means for applying a first actuating torque to steerable wheels of a vehicle according to a steering torque applied to said steering torque input means;means for detecting a la

[ What we claim is:] [1.] A vehicle steering control system, comprisingsteering torque input means;powered steering control means for applying a first actuating torque to steerable wheels of a vehicle according to a steering torque applied to said steering torque input means;means for detecting a lateral dynamic condition of said vehicle;active reaction generating means for applying a second actuating torque to said steerable wheels so as to control a turning movement of said vehicle according to a signal supplied from said detecting means, said second actuating torque being determined according to a deviation of an actual lateral dynamic response of said vehicle from a reference lateral dynamic response that is computed for each given steering input; andmeans for detecting an understeer condition from said deviation, and suppressing said second actuating torque when an understeer condition is detected on a steady basis.