초록 ▼

1 A dual loop cooling system for an internal combustion engine including a first loop or circuit (36) employing engine lubrication oil for cooling the engine cylinder and a second loop or circuit (48) employing water for cooling the aftercooler and engine head. A first flow control valve (72) and he

1 A dual loop cooling system for an internal combustion engine including a first loop or circuit (36) employing engine lubrication oil for cooling the engine cylinder and a second loop or circuit (48) employing water for cooling the aftercooler and engine head. A first flow control valve (72) and heat exchanger (54) operate to maintain an ideal temperature for the lubrication oil in the range of 200°-250°F. A radiator (86) and second flow control valve (94) in the second circuit (48) operate in response to engine output torque to cause the intake air to be at its lowest temperature at maximum engine output torque and to be at its highest temperature at minimum engine output torque. In one embodiment, the control valve (94) responds to engine water outlet temperature as determined by sensor (104). In another embodiment, a control valve (94′) responds to intake manifold air pressure as determined by sensor (106). In yet another embodiment, valve (94″) responds to compressor discharge air temperature as determined by sensor (108) to produce the desired transient response.

대표청구항 ▼

A temperature control apparatus for an air breathing internal combustion engine having a cylinder block, a compressor for pressurizing engine intake air, and an aftercooler for modifying the temperature of the pressurized intake air as it passes into the engine, said temperature control apparatus co

A temperature control apparatus for an air breathing internal combustion engine having a cylinder block, a compressor for pressurizing engine intake air, and an aftercooler for modifying the temperature of the pressurized intake air as it passes into the engine, said temperature control apparatus comprising: (a) first fluid circuit means for passing first coolant in heat exchange relationship with one or more engine cylinders to provide the primary coolant for the engine cylinders, said first circuit means including first control means for maintaining the temperature of the first coolant at a first level which is relatively constant for substantially all engine operating conditions; and (b) second fluid circuit means for passing secondary coolant distinct from the first coolant through the aftercooler in heat exchange relationship with the pressurized intake air, said second circuit means including second control means responsive to a control signal for controlling the temperature of the pressurized intake air supplied to the engine by modulating the temperature of the secondary coolant supplied to the aftercooler in proportion to engine output torque, said second control means including signal generating means for producing said control signal in response to an operating condition of the engine indicative of engine output torque to cause the intake air to be cooled by the aftercooler to its lowest temperature at maximum engine output torque and to be heated by the aftercooler to its highest temperature at minimum engine output torque.