STRUCTURE OF COOLING WATER SYSTEM FOR INTERNAL COMBUSTION ENGINE

To improve fuel efficiency of a vehicle at low cost by using a simple configuration.SOLUTION: In a cooling water system for a water-cooled type internal combustion engine mounted to a vehicle, one valve 57 that can be opened/closed optionally without depending on a current temperature of cooling water is provided on a flow passage in which both of cooling water flowing in a heater core 54 for exchanging heat with air in a cabin and cooling water flowing in a heat exchanger 55 for exchanging heat with fluid used for a transmission of a vehicle drive system flow. Whether or not the cooling water is caused to flow in the heater core 54 and the heat exchanger 55 is controlled by using the valve 57.SELECTED DRAWING: Figure 2 【課題】簡易な構成により低コストで車両の燃費性能の向上を実現する。【解決手段】車両に搭載される水冷式内燃機関の冷却水系統において、車室内の空気との間で熱交換を行うヒータコア５４を流通する冷却水、及び車両の駆動系の変速機に用いられるフルードとの間で熱交換を行う熱交換器５５を流通する冷却水がともに流れる流路上に、現在の冷却水の温度によらず任意に開閉操作が可能な一個のバルブ５７を設け、このバルブ５７により前記ヒータコア５４及び前記熱交換器５５に冷却水を流通させるか否かを制御するようにした。【選択図】図２