Patent ID: 6347619
Filing Date: 2002-02-19
Classification: F02B,F02D,F02M,Y02T

Abstract:
An internal combustion engine having multiple cylinders comprising:a cylinder head having intake and exhaust ports therein; at least one intake valve for each cylinder and at least one primary exhaust valve for each cylinder; an exhaust manifold in fluid communication with the exhaust ports for receiving exhaust gas therefrom; a turbocharger having an exhaust inlet coupled to the exhaust manifold for receiving exhaust gas therefrom and a turbine powered by the exhaust gas, the turbocharger further having an air inlet, an air compressor driven by the turbine and a compressed air outlet; an intake manifold in fluid communication with the compressed air outlet and the intake ports in the cylinder head for receiving and directing the compressed air to the cylinder head; and an exhaust gas recirculation (EGR) system comprising: a secondary exhaust port in the cylinder head for each cylinder; a secondary exhaust valve for each cylinder for admitting exhaust gas into the secondary exhaust port when open; an EGR manifold in fluid communication with the secondary exhaust ports and the intake manifold through an EGR valve to recirculate exhaust gas to the intake manifold; and a valve actuator opening the secondary exhaust valve during the expansion stroke of each cylinder when the pressure in the respective cylinder is greater than the pressure in the intake manifold and closing the secondary exhaust valve later in the expansion stroke.