Patent ID: 6742506
Filing Date: 2004-06-01
Classification: F02B,F02D,F02M,Y02T

Abstract:
A combustion engine, comprising:an inlet; a plurality of cylinders, each of the cylinders including at least one intake valve coupled to the inlet and at least two exhaust valves for divided exhaust gas flow, the exhaust valves including a first exhaust valve operable to open at the beginning of an exhaust stroke of the cylinder and a second exhaust valve operable to open at an end of the exhaust stroke of the cylinder; first and second exhaust collectors coupled to the first and second exhaust valves, respectively, for receiving exhaust gases from the cylinders; an exhaust-gas-driven turbo compressor coupled to the first exhaust collector for supercharging the engine; and a recirculating device for recirculating the exhaust gases, the recirculating device including a cooling device coupled to the second exhaust collector for cooling the exhaust gases and coupled to the inlet of the engine to permit the cooled exhaust gas to recirculate into the cylinders through the intake valves; the recirculating device further including a first control valve for regulating a quantity of the recirculated exhaust gases from the second exhaust collector, the cooling device being coupled to the second exhaust collector via the first control valve, wherein the first control valve is operable to be opened under a high engine load and operable to remain closed below a high engine load.