Patent ID: 7467041
Filing Date: 2008-12-16
Classification: G01L,G01M

Abstract:
1. A workload calculation apparatus for an internal combustion engine, which calculates a workload parameter indicative of a workload of the internal combustion engine having a combustion chamber, comprising: first correlation function setting means for setting a first correlation function indicative of an integral of the product of volume data indicating a change state of a volume of said combustion chamber and a reference signal having a predetermined frequency; reference signal generating means for generating the reference signal; in-cylinder pressure change amount data detecting means for detecting in-cylinder pressure change amount data indicative of the amount of change in pressure in the combustion chamber; second correlation function calculating means for calculating, on the basis of the generated reference signal and the detected in-cylinder pressure change amount data, a second correlation function indicative of an integral of the product of the reference signal and the in-cylinder pressure change amount data; and workload parameter calculating means for calculating the workload parameter on the basis of the first and second correlation functions.