| 摘要 |
A pump drive motor control apparatus is applied to a motor for driving a hydraulic pump which pumps brake fluid returned to a reservoir as a result of ABS control and supplies the pumped brake fluid to a hydraulic circuit. When a motor inter-terminal voltage becomes equal to or less than a voltage threshold in a period during which a motor control signal is at a low level (supply of electricity to the motor is stopped), the control apparatus changes the motor control signal to a high level (resumes the supply of electricity) for a predetermined time, to thereby control the rotational speed of the motor. The control apparatus reduces the rotational speed of the motor by lowering the voltage threshold, which affects the rotational speed of the motor, with the vehicle body deceleration during ABS control, which corresponds to the friction coefficient of road surface, which determines the required discharge flow rate of the hydraulic pump.
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