Control apparatus for internal combustion engine

Claim 1

A control apparatus for an internal combustion engine, comprising: reference position signal generating means for generating a reference position signal representing a first reference position and a second reference position for each cylinder of said engine in synchronism with operation of said engine; period measuring means for measuring predetermined interval periods of said reference position signal; predicted reference position period calculating means for calculating a succeeding period of said reference position signal as a predicted reference position period; timing control means for correcting a control signal for controlling operation of said engine on the basis of said predicted reference position period; and correcting coefficient calculating means for calculating a ratio between a first period extending from said first reference position to said second reference position and a second period from said second reference position to said first reference position on the basis of said predetermined interval period, to thereby calculate a correcting coefficient on the basis of said ratio; wherein said predicted reference position period calculating means calculates said predicted reference position period on the basis of said predetermined period and said correcting coefficient.