Patent ID: 7036467
Filing Date: 2006-05-02
Classification: F02B,F02D

Abstract:
1. A method for operating a combustion engine ( 10 ) with a variable compression ratio, comprising the following steps: determining a theoretical value for the compression ratio; adjusting the compression ratio to the theoretical value; correcting the adjusted compression ratio as a function of signals of a sensor mechanism of the combustion engine, wherein the step of correcting includes the step of determining an actual value of the compression ratio, wherein the step of determining the actual value includes an evaluation of signals at least of one combustion chamber pressure sensor and an evaluation of a chronological trend of the signals of the at least one combustion chamber pressure sensor, wherein the evaluation of the chronological trend take place on the basis of an angle of rotation-discrete scanning and detection of at least two values of output signals of the at least one combustion pressure sensor, and wherein as a quantity for the actual value of the compression ratio, a compression final volume VK is determined with a fixed displaced volume VH.