초록 ▼

The disclosure illustrates a cooling system for a turbocharged diesel engine having an aftercooler and an oil cooler. The cooling system is defined by two flow loops, one for the engine and the other for cooling purposes. An engine driven pump circulates a coolant through the engine block and cylind

The disclosure illustrates a cooling system for a turbocharged diesel engine having an aftercooler and an oil cooler. The cooling system is defined by two flow loops, one for the engine and the other for cooling purposes. An engine driven pump circulates a coolant through the engine block and cylinder heads. The pump also circulates coolant through the cooling loop which includes the engine oil cooler immediately upstream of a radiator and bypass line. The aftercooler is downstream of the radiator and bypass line. Placement of the oil cooler ahead of the radiator and bypass line produces a higher temperature potential which permits a reduction in radiator size in addition to other benefits. A flow control logic system embodied in a dual thermostat arrangement ahead of the radiator and bypass line minimizes mixing of bypass flow with radiator flow and reduces radiator flow rates to permit low aftercooler temperatures that hithertofore have not been achievable.

대표청구항 ▼

A cooling system for an internal combustion engine having an oil cooler, said system operative in various modes and comprising a combination of a heat exchanger and a heat exchanger bypass passage in parallel connection, said combination being downstream of the oil cooler and serially connected to a

A cooling system for an internal combustion engine having an oil cooler, said system operative in various modes and comprising a combination of a heat exchanger and a heat exchanger bypass passage in parallel connection, said combination being downstream of the oil cooler and serially connected to a discharge end of the oil cooler, pumping means for circulating a heat exchange medium through said cooling system and the oil cooler whereby the temperature potential across the heat exchanger is increased, thereby permitting a reduction in the size of the heat exchanger, and control means for sensing the temperature of the heat exchange medium at at least one predetermined location in the cooling system and in response to the temperature sensed, effecting flow of substantially all of the medium discharged from the oil cooler through only the combination heat exchanger when the cooling system is in a full cooling mode; effecting flow of substantially all of the medium discharged from the oil cooler through only combination bypass passage when the cooling system is in a full heating mode; and effecting predetermined proportioning of substantially all of the medium discharged from the oil cooler between the heat exchanger and the bypass passage of said combination when said cooling system is operating in a mode intermediate the full cooling and full heating modes.