Patent ID: 8453625
Filing Date: 2013-06-04
Classification: F02D,F02M,Y02T

Abstract:
1. A method for operating an internal combustion engine, the method which comprises: providing an internal combustion engine having a working cylinder in which a piston is moved up and down so that, within a working cycle of 720 degrees of a crankshaft, successively an intake stroke, a compression stroke, a power stroke and an exhaust stroke are performed and which has at least three gas exchange valves assigned thereto, the internal combustion engine having an exhaust-gas line and having at least one inlet port which leads into a gas exchange valve configured as an inlet valve and which, via the inlet valve, supplies at least combustion air to the working cylinder, the internal combustion engine having at least one outlet port which leads into a gas exchange valve configured as an outlet valve and which, via the outlet valve, discharges at least exhaust-gas from the working cylinder into the exhaust-gas line, and the internal combustion engine having at least one exhaust-gas recirculation line which is connected to the exhaust-gas line of the internal combustion engine, wherein at least one of the gas exchange valves is used by the working cylinder as an EGR valve and is supplied with exhaust-gas from an exhaust-gas recirculation line; and opening the EGR valve at least twice in a predetermined operating state of the internal combustion engine within a working cycle of 720 degrees of the crankshaft, wherein an opening duration of a first opening of the EGR valve at least overlaps in time with an opening of the outlet valve during the exhaust stroke and wherein an opening duration of a second opening of the EGR valve at least overlaps in time with an opening duration of the inlet valve during the intake stroke, wherein the EGR valve is closed between the first and the second opening.