Patent ID: 7614290
Filing Date: 2009-11-10
Classification: F02D,G01P

Abstract:
1. An angular speed detecting apparatus for a crankshaft of an internal combustion engine, said angular speed detecting apparatus detects a rotational angular speed of said crankshaft based on an output of a pulse generator which generates a crank pulse at every predetermined rotational angle of said crankshaft, said angular speed detecting apparatus comprising: averaging means for calculating an average value of data of a speed parameter indicating a rotational angular speed of said crankshaft, the data being sampled at intervals of 720/N degrees where (N) is a number of cylinders of said engine; learning means for calculating a learning correction coefficient for correcting the speed parameter according to the average value; and correcting means for correcting the speed parameter using the learning correction coefficient, wherein said averaging means calculates the average value of the data of the speed parameter sampled within a sampling range set according to a number of cylinders of said engine, and said learning means calculates the learning correction coefficient corresponding to a predetermined central angular range located at the center of the sampling range, and wherein the sampling range is set to an angular width obtained by multiplying 720/N degrees by an odd number, and the predetermined central angular range has a width of 720/N degrees.