Patent ID: 6530347
Filing Date: 2003-03-11
Classification: F01P

Abstract:
A cooling apparatus for a liquid-cooled internal combustion engine (10), comprising:a radiator (20) that cools coolant discharged from the engine (10) and returns the cooled coolant to the engine (10); a bypass passage (30) through which coolant discharged from the engine (10) bypasses the radiator (20) and returns to the engine (10); and a heat exchanger (90) that exchanges heat between coolant discharged from the engine (10) and a working oil; wherein when the temperature of the coolant discharged from the engine (10) is below a predetermined temperature, the flow rate of the coolant returned to the engine (10) is restricted to between 1 and 5 L/min, and the coolant discharged from the engine (10) is allowed to flow through the radiator (20) and the bypass passage (30) but not the heat exchanger (90); and when the temperature of the coolant discharged from the engine is above the predetermined temperature, the coolant discharged from the engine is allowed to flow through the radiator (20), the bypass passage (30), and the heat exchanger (90).