Patent ID: 6626030
Filing Date: 2003-09-30
Classification: F02D

Abstract:
A cylinder discrimination device in an engine, comprising:a crank angle signal outputting unit for outputting a crank angle signal at a crank angle position for each unit crank angle using a reference crank angle position for each stroke phase difference between cylinders as a reference, in synchronization with the rotation of the crankshaft; a cylinder discrimination signal outputting unit for outputting different numbers of cylinder discrimination signals, depending on cylinders to be discriminated, during a predetermined crank angle period for each stroke phase difference between cylinders; a signal counting unit for counting the number of crank angle signals output after a cranking start; a count value holding unit for holding a count value counted by said signal counting unit of each time said cylinder discrimination signal is output; and a cylinder discrimination unit for comparing the count value of the number of crank angle signal outputs at a first cylinder discrimination timing by said signal counting unit with said past count values held in said count value holding unit, and detecting the number of cylinder discrimination signals output during said predetermined crank angle period, to perform first cylinder discrimination after the cranking start based on the number of said cylinder discrimination signals.