Oil supply apparatus for engine

An oil supply apparatus for an engine which supplies oil to a hydraulic actuation device, the oil supply apparatus comprising:

• a variable capacity oil pump;
• an oil supply passage that connects the oil pump and the actuation device to supply the oil to the actuation device;
• a hydraulic pressure detection section that detects a hydraulic pressure in the oil supply passage;
• a temperature detection section that detects a temperature of the engine;
• an oil control valve that changes an oil discharge amount as an amount of the oil discharged from the oil pump by adjusting a flow rate of the oil supplied to a pressure chamber of the oil pump;
• a mechanical relief valve that partially discharges the oil to outside of the oil supply passage when a discharge hydraulic pressure as a pressure of the oil discharged from the oil pump exceeds an upper limit pressure;
• and
• a control section that controls the oil control valve, wherein
• the control section:
• sets a target hydraulic pressure as a target value of the hydraulic pressure in the oil supply passage according to an operation state of the engine when the temperature detected by the temperature detection section is equal to or higher than a predetermined set temperature, and executes feedback control of the oil control valve such that the hydraulic pressure detected by the hydraulic pressure detection section matches the target hydraulic pressure;
• and
• prohibits the feedback control and controls the oil control valve such that the oil discharge amount becomes a maximum amount when the temperature detected by the temperature detection section is lower than the set temperature.