Patent ID: 6367319
Filing Date: 2002-04-09
Classification: F01L,F02D,F02M,F02P,Y02T

Abstract:
A method of controlling an internal combustion engine in dependence on an exhaust gas pressure, the internal combustion engine including an intake tract, at least one cylinder, an exhaust gas tract, inlet and outlet valves disposed at the cylinder, and a crankshaft defining a crankshaft angle, the method which comprises:determining an exhaust gas pressure in the cylinder during a valve overlap of the inlet and outlet valves that causes an internal exhaust gas recirculation in dependence on an estimated value of an exhaust gas pressure effected by a combustion of an air/fuel mixture in the cylinder, and a variable characterizing a centroid of the valve overlap of the inlet and outlet valves, and thereby defining the centroid with reference to a surface produced by the overlapping valve strokes of the inlet and outlet valves referred to a crankshaft angle.