| 摘要 |
<p>PURPOSE:To eliminate a steering angle detector by running a motor by means of a drive current calculated by a return current calculating means when the return state of a steering wheel is detected by a steering wheel return detecting means. CONSTITUTION:A detecting part 71d detects the return state of a steering wheel based on torque T and a terminal voltage VM. When the return state of the steering wheel is detected, a signal by means of which the return direction of the steering wheel is indicated is outputted to a calculating part 71e. The calculating part 71e calculates the absolute value of a return current IR of a rear wheel based on a car speed V, and polarity thereof is decided based on a signal by means of which the return direction of the steering wheel is indicated. An adder 74a adds an indication current I provided from an indication current function part 73 and a steering wheel return current IR provided from the calculating part 71e, and an adding result is inputted as the target current of the drive current of a motor 8 to a subtractor 74b. The subtractor 74b subtracts a feedback signal from a detecting circuit 71c from the target current, and based on the subtracting result, the motor 8 is run by means of a PWM drive circuit 72.</p> |
