Patent ID: 8006655

Claim:
A heat storage system for a vehicle comprising a heat accumulator, in which engine coolant is stored and allowed to flow, in an engine coolant circulation circuit connecting an engine and a heater core of an air conditioning unit, the system characterized in that the engine coolant circulation circuit is a circuit connecting heat-accumulator side inlet and outlet, engine side inlet and outlet, and heater-core side inlet and outlet, and has a circuit configuration in which four modes are selectable by switching a valve set in the circuit, the four modes including: a heat storage mode in which the engine coolant circulates at least through the engine side inlet and outlet and the heat-accumulator side inlet and outlet; a heat storage maintaining mode in which the heat-accumulator side inlet and outlet are disconnected; a quick engine warm-up mode in which hot water stored in the heat accumulator circulates only through the heat-accumulator side inlet and outlet and the engine side inlet and outlet; and a quick interior warm-up mode in which the hot water stored in the heat accumulator circulates only through the heat-accumulator side inlet and outlet and the heater-core side inlet and outlet.