| 摘要 |
PURPOSE:To promptly obtain a sufficient degree of room heating temperature at cold time of an engine, by taking out cooling water from an exhaust side water jacket divided with a partition in a cooling water jacket, heating the cooling water through an exhaust gas heat exchanger, and then guiding the water to a room heating heater core. CONSTITUTION:Cooling water in an intake side water jacket 1b divided by a partition P flows in through a cooling water circulative route 20 interposing a radiator 21 by driving of a water pump 23 and is cooled, and then returned from a flow inlet 17 into the water jacket 1b. On the other hand, cooling water in an exhaust side water jacket 1a is firstly guided to a heat exchanger 10 by driving of a water pump 22 ane heated by exhaust gas flowing in an exhaust passage 9, and then guided to a heater core 5 of an air conditioner to heat air conditioning air. Thereafter the cooling water is returned from a flow inlet 2 into the water jacket 1a. At completion of warming operation of an engine, a selector valve 12 is selectively operated to an opening side of a bypass passage 11, while a thermostat valve 16 is opened to the side of a bypass passage 14, and the cooling water is cooled by a radiator 15. |
