Patent ID: 7958779
Filing Date: 2011-06-14
Classification: F02D,G01P

Abstract:
1. An angular velocity/angular acceleration calculator for a crankshaft in an internal combustion engine, the calculator comprising: a crank angle detection device that detects a crank angle in said internal combustion engine and a time at said crank angle; a crank angle correction device that corrects, in accordance with a predetermined crank angle pitch, said crank angle and said time both detected by said crank angle detection device; and an angular velocity/angular acceleration calculation device that calculates an angular velocity and an angular acceleration of said crankshaft by converting a function of said time with respect to said crank angle corrected by said crank angle correction device so as to be regarded as a periodic function, and utilizing a derivative of said converted function with respect to said crank angle obtained from a discrete Fourier transform of said converted function.