To further surely change, at the time of changing the compression ratio of an internal combustion engine, valve timing of an intake valve or an exhaust valve to a predetermined target valve timing determined according to the compression ratio.
When the compression ratio of a variable compression ratio internal combustion engine is changed, valve timing (Vtin or Vtex) of at least either the intake valve or the exhaust valve is changed to the target valve timing by changing the relative rotating phase of a reduction gear and a crank-side gear by a crank-side variable rotating phase mechanism (S105). When the Vtin or Vtex is shifted from the target valve timing, the Vtin or Vtex is changed to the target valve timing by an intake-side VVT or exhaust-side VVT so as to solve the slippage (S108).
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Mayuko Wakuda
Kazunobu Sera
Tsutomu Toyama
Takehiko Sekine