| 摘要 |
PURPOSE:To raise the cooling efficiency of a boiled and cooled engine and to prevent leakage of vaporized coolant, by controlling a feed pump of the engine to keep the liquid surface at a constant level, and returning liquid coolant back to a cooling system from a reservoir tank when the pressure in a closed circuit of coolant becomes negative. CONSTITUTION:Vapor of a coolant produced in a water jacket 13 of an engine is cooled and liquefied in a condenser 23, to which forced draft of cooling air is supplied from a motor-driven fan 17, and the liquefied coolant is returned to the water jacket 22 by a feed pump 20. The motor-driven fan 17 and the feed pump 20 are controlled by a control circuit 24 to keep the level of liquid surface, the boiling temperature and pressure in the system at optimum values. When pressure in the system becomes negative and a vacuum switch 59 is turned OFF, for instance, by driving a vehicle down a slope at a high speed, or when the vehicle is stopped, current supply to a solenoid valve 28 is stopped and the valve 28 is opened, so that coolant in a reservoir tank 25 is drawn into the water jacket 22 to keep a required level of coolant. |
