Patent ID: 7489998
Filing Date: 2009-02-10
Classification: F02B,F02D,F02M,Y02T

Abstract:
1. A method for controlling an internal combustion engine with at least one cylinder having a combustion chamber configured and to which a piston is assigned, with an intake tract that communicates with the combustion chamber of the cylinder as a function of the position of a gas inlet valve, with an exhaust gas tract that communicates with the combustion chamber of the cylinder as a function of the position of a gas outlet valve, with an injection valve provided to meter in fuel into the combustion chamber, and with a cylinder pressure sensor that detects a pressure in the combustion chamber of the cylinder, comprising: metering a predetermined fuel mass into the combustion chamber prior to or during an intermediate compression approximately at an upper dead center of the piston during a load change of the engine; measuring pressure in the combustion chamber during an intermediate compression within a predetermined first crankshaft angle window during which fuel in the combustion chamber is oxidized, the measured pressure resulting in measured pressure values; determining a degree of conversion of the first fuel mass as a function of the measured pressure values and reference pressure values which are characteristic of the corresponding pressure pattern in the combustion chamber when no fuel is metered in to the combustion chamber; and determining an actuating signal for a final control element of the internal combustion engine as a function of the degree of conversion.