Patent ID: 6727671
Filing Date: 2004-04-27
Classification: B62D

Abstract:
A control system for an electric power steering apparatus, comprising:a motor for assisting a driver in operating a steering wheel; means for calculating an assist current to be provided to the motor; a motor driving circuit for driving the motor based on the assist current; and means for monitoring a calculation result of the means for calculating an assist current, wherein the means for calculating an assist current further comprises: means for calculating a basic control quantity for the assist current from a steering torque of the steering wheel; and means for calculating a modified control quantity to correct the basic control quantity based on steering conditions of the steering wheel, wherein the monitoring means further comprises: means for deciding, as a first anomaly, whether the calculation result of the basic control quantity calculating means is normal or anomalous in light of the steering torque of the steering wheel; and means for deciding, as a second anomaly, whether the calculation result of the modified control quantity calculating means is normal or anomalous in light of the steering conditions of the steering wheel.