| 摘要 |
<p>A motor control system includes a host ECU and a motor control device. The host ECU controls a wheel driving unit. A power supply to the ECU is halted when an IG switch is turned OFF. The motor control device receives a PWM command signal from the host ECU and controls a motor of a cooling blower. The host ECU modulates a duty ratio of pulses of the PWM command signal by a target rotating speed of the motor, modulates a period of the pulses of the PWM command signal by a continuous operation time of the motor, and transmits the result to the motor control device. The motor control device reconstructs both the target rotating speed and the continuous operation time, and controls rotating speed of the motor from the received PWM command signal. Moreover, the motor control device halts rotation of the motor when a signal-unreceiving time period of the PWM command signal becomes larger than the continuous operation time.</p> |
