Electric power steering apparatus.

摘要

An electric power steering provides a differential compensating circuit (54) in which a command current signal is added with a derivative of the command signal to provide a compensated current signal to a control circuit (28) for varying the current to an electric motor (11) arranged to provide power assistance to a steering rack (6). The apparatus provides signals representative of torque and vehicle speed to a function generator (50) to provide a first command signal which is added with a seif-centering command current and the output is provided to give a second command current which is effectively the first command current limited in dependence upon the vehi- de speed. The second command current is operated upon by the differential compensating circuit (54) to obtain the compensated current signal.