| 摘要 |
PURPOSE:To raise the thermal efficiency of a boiled and cooled engine, to raise the efficiency of its cooling system, to make the engine compact and light and to eliminate maintenance of the engine, by controlling a pump and a fan according to the operational conditions of the engine, and introducing liquid coolant into a cooling system from an external auxiliary tank when open air is introduced into the cooling system or when the engine is stopped. CONSTITUTION:Vapor of a coolant produced in a water jacket 22 of an engine 21 is cooled and liquefied in a condenser 23, to which forced draft of cooling air is supplied from a motor- driven fan 26, and the liquefied coolant is returned to the water jacket 22 by a motor-driven pump 25. The fan 26 and the pump 25 are controlled according to the temperature of coolant, the liquid level and the operational conditions of the engine to keep optimum cooling conditions. On the other hand, an auxiliary tank 50 disposed on the outside is connected to a by-pass passage of a lower tank 24 via a solenoid valve 53 for storing almost an equal amount of liquid coolant to the capacity of a gas-phase space 22a when the engine is operated. When operation of the engine 21 is stopped, a control circuit 30 opens a second auxiliary passage 52 by stopping current supply to a second solenoid valve 54 in response to the output signal of a temperature sensor 32. Further, if the coolant surface is not reached to the set level of a second liquid-level sensor 58 after starting of the engine, coolant is introduced into the cooling system by opening the solenoid valve 53, 55 and closing the solenoid valve 54. |
