Electric oil pump having temperature sensors on circuit board and transmission to execute energization prohibition control of pump

A power supply controller, controlling supply of electric power to an electric oil pump in a vehicle, which comprises a hydraulic transmission transmitting a driving force to a drive wheel, and the electric oil pump supplying an oil pressure to the hydraulic transmission, the power supply controller comprising:

• an electric oil pump control part comprising a circuit board and controlling an operation of the electric oil pump;
• control unit controlling power supply to the electric oil pump control part;
• board temperature sensor detecting a temperature of the circuit board;
• and
• oil temperature sensor provided in the hydraulic transmission and detecting a temperature of a working oil in the hydraulic transmission as an oil temperature,
• wherein the control unit executes energization prohibition control for prohibiting power supply to the electric oil pump control part when the temperature of the circuit board detected by the board temperature sensor exceeds a predetermined first threshold temperature, and executes cancellation determination for determining whether to cancel the energization prohibition control based on the oil temperature detected by the oil temperature sensor during execution of the energization prohibition control,
• wherein the control unit cancels the energization prohibition control when the oil temperature drops below a predetermined second threshold temperature lower than the first threshold temperature and an integrated value of a difference obtained by subtracting the oil temperature from the second threshold temperature exceeds a predetermined value in the cancellation determination.