Patent ID: 8708428

Claim:
A pump control apparatus which controls discharge of brake fluid using rotation of a motor comprising: a motor main body including a rotating shaft that drives a pump; a high speed circuit configured to operate the motor at a first rotation speed when the high speed circuit is connected to a power supply; a low speed circuit configured to operate the motor at a second rotation speed which is slower than the first rotation speed when the low speed circuit is connected to the power supply while a voltage in the low speed circuit becomes higher than a power supply voltage when the power supply is connected to the high speed circuit; a switch connected between the power supply and the high speed circuit, and connected between the power supply and the low speed circuit; an output terminal which is connected to a first branch point via a first resistor, the first branch point being disposed in the low speed circuit between the motor main body and the switch, and which is connected to a second branch point via a second resistor, the second branch point being disposed in the high speed circuit between the motor main body and the switch; a temperature sensor that detects a temperature of the motor; and a controller determines a load state of the motor based on a first output voltage at the output terminal, and, if a first discharge state of the pump is normal, the controller determines a corrected first output voltage based on the first output voltage at the terminal and the temperature of the motor detected by the temperature sensor, and determines the load state of the motor based on the corrected first output voltage, wherein a value of the first resistor arranged between the output terminal and the low speed circuit is lower than a value of the second resistor arranged between the output terminal and the high speed circuit.