Patent ID: 6536407
Filing Date: 2003-03-25
Classification: F01L,F02B,F02D,F02M,Y02T

Abstract:
Method of controlling the combustion process in the combustion chamber (3) of a four-stroke internal combustion engine with at least one cylinder (1) having at least one inlet valve (9) and one exhaust valve (11), comprising supply of a homogeneous fuel/air mixture to the combustion chamber, and compression of the mixture to self-ignition, characterized in that the exhaust valve (11) during the exhaust stroke of the piston (4) is controlled so that it, at least within a lower rpm range, closes before the piston has reached its upper dead center point, the degree of opening of the valve being varied, depending on engine load and rpm so that the amount of residual gas at closing of the valve is greater at low loads and high rpm than at high loads and low rpm, to thereby vary the ignition delay by varying the degree of dilution of the fuel/air mixture with residual gases in the combustion chamber.