| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmission ratio varying device for suppressing the influences of outer force input via a steering wheel on a steering system. SOLUTION: An ECU controls the rotating drive of a motor in accordance with a proportional controlled variable obtained by multiplying a deviation between an ACT target angle as a target steering angle set depending on a vehicle speed V of a vehicle and a motor rotating angleθm by a proportional gain Kp. At this time, the ECU gradually reduces the proportional gain Kp when a gain setting part determines in accordance with the steering angleθs that the steering held condition of a steering wheel is continued for a fixed time, specifically when the condition of an angle variationΔθs or less that an angle variation ¾θs-θs<SB>1</SB>¾ of the steering angle is determined to be the steering held condition is continued for a fixed time. COPYRIGHT: (C)2009,JPO&INPIT |
