Patent ID: 6681562
Filing Date: 2004-01-27
Classification: F02D,Y02T

Abstract:
A method of reducing exhaust gas emissions of an internal combustion engine, the engine having at least one cylinder supplied with an air/fuel mixture when a crankshaft of the internal combustion engine rotates, at least one intake valve, at least one exhaust valve, control members for controlling the opening and closing of the intake and exhaust valves, and a piston reciprocating between a top dead-center position and a bottom dead-center position in the cylinder, the method of reducing exhaust gas emissions comprising the steps of:controlling the exhaust valve so that it opens before the piston has passed the bottom dead-center position and closes before the intake valve opens, supplying an air/fuel mixture with a lambda value greater than 1 to the cylinder, and controlling the intake valve so that it opens during the intake stroke after the piston has X passed the top dead-center position.