Patent ID: 6807956
Filing Date: 2004-10-26
Classification: F02D,F02M,Y02T

Abstract:
A method of internally recirculating a residual gas for controlling a cylinder-charge within cylinders of an internal combustion engine having variable timing of gas-exchange valves, comprising:controlling closing times of at least one exhaust valve of a respective cylinder; opening in a first operating phase at least one intake valve of the respective cylinder in a vicinity of a top dead center; intermittently discharging the residual gas in front of the at least one intake valve; and implementing at least one further opening phase of the at least one intake valve within a charge-exchange process to increase a charge movement in a combustion chamber, the at least one further opening phase being offset in time from the first opening phase of the at least one intake valve; wherein the at least one intake valve is opened in two phases that are offset in time from one another, the first opening phase of the at least one intake-valve beginning in the vicinity of the top dead center and a second opening phase of the at least one intake valve beginning after the top dead center, and wherein a beginning of the second opening phase is selected to be after an end of the first opening phase such that a vacuum pressure is built up in the respective cylinder so that a desired high inflow velocity for a gas mixture into the respective cylinder comes about.