To more quickly obtain appropriate valve timing in an internal combustion engine changing compression ratio by changing relative distance between a cylinder head and a piston on a top dead center.
In the internal combustion engine equipped with the variable compression ratio mechanism, valve timing corrected when the internal combustion engine has predetermined compression ratio is stored as a learning value, and the learning value is changed by slippage quantity at a time when valve timing of at least any of driving valve of a suction valve or an exhaust valve relatively slips off of a predetermined timing when the piston stays at a predetermined position. Since slippage of valve timing accompanying compression ratio change is corrected beforehand, appropriate valve timing can be obtained quickly.
KAMIYAMA EIICHI
Hidemi Matsukura
Mayuko Wakuda
Kazunobu Sera
Tsutomu Toyama