초록 ▼

The operating temperature of an internal combustion engine is maintained within desired limits by employing a single coolant temperature sensor for controlling and coordinating the operation of three different temperature control devices for the engine coolant. When the sensed coolant temperature is

The operating temperature of an internal combustion engine is maintained within desired limits by employing a single coolant temperature sensor for controlling and coordinating the operation of three different temperature control devices for the engine coolant. When the sensed coolant temperature is in a relatively low range a flow control valve controls the amount of coolant diverted from the engine jacket to a radiator to dissipate heat absorbed by the coolant from the engine. If the coolant temperature exceeds that low range, even though the control valve is fully open and all of the coolant is circulated through the radiator, the sensor then effects the opening of radiator shutters to cause ram air to impinge on the radiator to increase the cooling of the coolant. If the temperature still continues to rise after the shutters are fully open, the coolant sensor causes operation of a variable speed fan drive to blow a sufficient amount of air through the radiator to cool the coolant back down to the desired operating range. Such sequential operation of the three control devices provides close temperature control within a relatively narrow range despite wide variations of external conditions and load on the engine, resulting in higher efficiency and longer engine life.

대표청구항 ▼

An engine temperature control system for maintaining the temperature of coolant, in the engine jacket of an internal combustion engine, within desired narrow limits regardless of external conditions and load on the engine, comprising: a radiator through which the coolant may be circulated from the e

An engine temperature control system for maintaining the temperature of coolant, in the engine jacket of an internal combustion engine, within desired narrow limits regardless of external conditions and load on the engine, comprising: a radiator through which the coolant may be circulated from the engine jacket to effect cooling of the coolant; a temperature sensor for sensing the temperature of the coolant in the engine jacket; means responsive to said temperature sensor for producing a controlled fluid pressure which is a function of and represents the sensed temperature; a coolant flow control valve which responds to the fluid pressure, when the sensed coolant temperature is in a relatively low temperature range, to vary the amount of coolant diverted to and flowing through the radiator; radiator shutters controlled by the fluid pressure, when the sensed temperature is in a medium temperature range above the low temperature range, for adjusting the amount of ram air impinging on the radiator; and a variable speed fan drive responsive to the fluid pressure, when the sensed coolant temperature is in a relatively high temperature range above the medium range, for blowing a controlled amount of air through the radiator.