Importance

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Abstract

The controller possesses a reference torque signal setting unit which generates a reference signal which becomes high when the detected signal becomes high based on at least the signal detected from the steering torque sensor; a correction torque signal setting unit which generates a correction torque signal (D.sub.N *R.sub.T *R.sub.V), which becomes high when the detected signal becomes high based on at least the signals detected from the revolution number sensor for the electric motor and from the vehicle speed sensor; and a target torque signal calculator which subtracts the correction torque signal from the reference torque signal (D.sub.N *R.sub.T *R.sub.V) to output a target torque signal (D.sub.T +-D.sub.N *R.sub.T *R.sub.V) to the electric motor; and the controller also making the correction torque signal high when failure of the vehicle speed sensor is detected. For this reason, even if the vehicle speed sensor fails, light steering operation can be performed at a low vehicle speed range and the stability of the steering system can be obtained at a high vehicle speed range.

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First Claim