Control device of electric power steering system of vehicle, calculates support measure compensation value, so that velocity of motor relative to road surface reaction force is suppressed, corresponding to higher-order wheel speed

摘要

The control device defines higher-order wheel speed frequency as a frequency obtained by multiplying ground-speed frequency of steered wheel with preset value. Road surface reaction force is defined so that movement of steered wheels (2) of vehicle on road is learnt with respect to speed of engine relative to road surface reaction force. A support measure compensation calculator (22) calculates the support measure compensation value so that velocity of motor relative to the road surface reaction force is suppressed, corresponding to the higher-order wheel speed.