| 摘要 |
<p>A motor drive circuit (43) outputs a voltage corresponding to a duty ratio of a PWM signal, to an assist motor (30) by controlling electric power supplied from a direct-current power supply (Batt) through PWM. When an MPU (41) that controls the motor drive circuit (43) determines that a determination current value (Ij) obtained by adding a shaft force correction current value (In) to a motor current (I) exceeds a current threshold value (It), the MPU (41) decreases the duty ratio of a low-voltage switching element of the motor drive circuit (43) by multiplying the duty ratio by a duty limit value (Gd). When the MPU (41) performs the determination, the MPU (41) increases the shaft force correction current value (In) based on the vehicle speed (V) of the vehicle.</p> |
