CONTROL DEVICE OF ELECTRIC POWER STEERING SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide an electric power steering system higher in reliability by making it possible to precisely and efficiently limit a steering auxiliary command value in correspondence with a status and making it possible to certainly limit also torque fluctuation. SOLUTION: This electric power steering system to drive and control a motor to give assist torque to the steering system by the steering auxiliary command value computed by referring to an assist map in accordance with steering torque and vehicle speed is furnished with a steering auxiliary command limiting value computing part 40 to compute a steering auxiliary command limiting value to limit the steering auxiliary command value in accordance with a prescribed condition and limits the steering auxiliary command value so as not to exceed the steering auxiliary command limiting value in accordance with deflection or percentage of the steering auxiliary command value Imref and the steering auxiliary command limiting value Imlmt. COPYRIGHT: (C)2009,JPO&INPIT