Patent ID: 7765857
Filing Date: 2010-08-03
Classification: B60K,B60L,F02D,G01M,Y02T

Abstract:
1. An internal combustion engine system having a multi-cylinder internal combustion engine capable of outputting power to a drive shaft via a torsional element, said internal combustion engine system comprising: a rotation regulating module connected to an output shaft of said internal combustion engine via said torsional element and connected to said drive shaft to be capable of regulating a rotation speed and rotation fluctuation of the internal combustion engine; a rotational position detecting module detecting a rotational position of the output shaft of said internal combustion engine; a rotation fluctuation calculating module calculating the rotation fluctuation of said internal combustion engine based on said detected rotational position; an influence component calculating module calculating an influence component given to the rotation fluctuation of the internal combustion engine by regulation of the rotation speed and the rotation fluctuation of said internal combustion engine by said rotation regulating module, based on a transfer function in an influence given to the rotation fluctuation of said internal combustion engine with respect to torque output of said rotation regulating module, which is obtained by solving an equation of motion for a mechanical model including said internal combustion engine, said torsional element and said rotation regulating module, and an amplitude and a phase of the torque output of said rotation regulating module; and a misfire determining module determining whether or not any of cylinders of said internal combustion engine misfires based on said calculated rotation fluctuation of the internal combustion engine and said calculated influence component.