Patent ID: 6915763

Claim:
An engine cooling device comprising: a cooling circuit that is so constructed as to include a radiator passage for causing cooling medium flowing from a body of an engine to flow into the body of the engine via a radiator, a bypass passage for causing cooling medium flowing out from the body of the engine to flow into the body of the engine without flowing via the radiator, and a control valve for controlling a flow rate of cooling medium flowing through the bypass passage; a heat-accumulating passage that is provided with a heat-accumulating container for storing the cooling medium in a thermally insulated state and that constitutes a heat-accumulating circuit for causing the cooling medium in the heat-accumulating container to circulate via the body of the engine by being selectively connected to the cooling circuit; and a controller that i) completes the heat-accumulating circuit by connecting the heat-accumulating passage to the cooling circuit to supply the cooling medium in the heat-accumulating container to the body of the engine and opens the control valve to increase a flow rate of cooling medium flowing through the bypass passage, and then ii) disconnects the heat-accumulating passage from the cooling circuit and that closes the control valve.