초록 ▼

A coolant circulation circuit of an internal combustion engine includes a heat accumulation tank having a heat insulating structure and a heater core for heating air for heating a compartment in the vehicle. High temperature coolant is reserved in the heat accumulation tank even when the engine is s

A coolant circulation circuit of an internal combustion engine includes a heat accumulation tank having a heat insulating structure and a heater core for heating air for heating a compartment in the vehicle. High temperature coolant is reserved in the heat accumulation tank even when the engine is stopped. An intake air heat exchanger is disposed in the circuit on the downstream side of the heater core, and high temperature coolant can effectively heat the intake air. An engine lubricating oil heat exchanger and a transmission operating oil heat exchanger are arranged in the circuit on the downstream side of the intake air heat exchanger. Intake air, engine lubricating oil and transmission operating oils are suitably heated during warm-up of the engine to thereby improve fuel economy and reduce exhaust gas pollution.

대표청구항 ▼

[ We claim:] [1.] A coolant circulating system in a water-cooled internal combustion engine of a vehicle, said system comprising:a coolant circuit including a circulation pump for circulating coolant through the engine, the coolant circuit having a direction of circulation;a heat accumulation tank h

[ We claim:] [1.] A coolant circulating system in a water-cooled internal combustion engine of a vehicle, said system comprising:a coolant circuit including a circulation pump for circulating coolant through the engine, the coolant circuit having a direction of circulation;a heat accumulation tank having a heat insulating structure for accumulating therein coolant flowing out from the engine;a heater core disposed on the downstream side of the heat accumulation tank for exchanging heat between the coolant flowing out from the heat accumulation tank and air for heating a compartment in the vehicle;heat exchanger means disposed in the coolant circuit on the downstream side of the heater core for exchanging heat between the coolant and at least one of the engine lubricating oil, the automatic transmission operating oil, and engine intake air; anda coolant circuit portion for connecting the heat exchanger means on the downstream side thereof to the inlet side of the engine.