Patent ID: 7349796
Filing Date: 2008-03-25
Classification: F02D

Abstract:
1. A piston position determining apparatus for determining a piston position in each cylinder of an engine of which the number of cylinders is an odd number, comprising: a detector that detects which of a plurality of reference angle positions a crankshaft of said engine arrives at; a signal generator that outputs a cam angle signal at a predetermined angle position of a camshaft of said engine; and a determining section that determines a crank angle region in which an output pattern of said cam angle signal is determined based on which of said plurality of reference angle positions said crankshaft arrives at, and further determines whether or not it is time for determining the piston position based on the output pattern of said cam angle signal in said crank angle region, said determining section determining the cylinder corresponding to a predetermined piston position based on the output pattern of said cam angle signal in said crank angle region when it is time for judging the piston position.