Patent ID: 6082188
Filing Date: 2000-07-04
Classification: G01M

Abstract:
A method of detecting cyclical combustion fluctuations in a multicylinder internal combustion engine, which comprises the following steps:ascertaining a nonconcentricity value for each cylinder of a multicylinder internal combustion engine, wherein the nonconcentricity value is proportional to a change in a speed of the engine;calculating a mean value from nonconcentricity values ascertained during successive combustion cycles individually for each cylinder;determining a deviation quantity, which is proportional to cyclical combustion fluctuations, by comparing a current nonconcentricity value with mean value for the respective cylinder;comparing the deviation quantity with an individual-cylinder-specific limit value; anddeducing that the combustion in the engine is cyclically fluctuating if the comparison in the comparing step does not meet a predetermined condition.