| 摘要 |
A main cooling circuit is formed by an engine, a radiator and a first pump. A hot water circuit is formed by the engine, a heater core and the first pump. A heat storing water circuit is connected between a bifurcating point of the hot water circuit and the engine, wherein a second pump and a heat storage tank are provided in the heat storing water circuit. Engine cooling water stored in the heat storage tank is circulated by the second pump, so that the hot water is supplied to the engine before the engine operation is started. The engine cooling water is also circulated by the second pump during the engine operation, so that hot water is stored in the heat storage tank.
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