| 摘要 |
PROBLEM TO BE SOLVED: To dissolve a lowering of steering wheel stability when a steering angle is large by generating self-alighting torque for restoring a steering wheel into a neutral position in a control means for controlling the operation of a motor-driven power steering for applying steering assist torque to a parallel geometry type steering system. SOLUTION: A target current setting means M1 of an electronic control unit U computes a target current IMS for driving a motor 27 of a motor-driven power steering S on the basis of steering torque T detected by a steering torque detecting means S1, a steering angleθdetected by a steering angle detecting means S2, vehicle speed V detected by a vehicle speed detecting means S3 and steering rotating speed N computed by a steering rotating speed computing means M2. A driving control means M3 converts the target current IMS into motor control voltage V0 and drives the motor 27 through a motor driver 32. At this time, a lowering of steering wheel stability is compensated by generating larger steering assist torque to the motor-driven power steering S in proportion to the increase of the steering angle and the decrease in the vehicle speed. |
