Spark ignition type internal combustion engine

A spark ignition type internal combustion engine comprising:

• a variable compression ratio mechanism that changes a mechanical compression ratio;
• and
• a variable valve mechanism that changes a valve characteristic of an intake valve or an exhaust valve,
• wherein the variable valve mechanism is mechanically coupled to the variable compression ratio mechanism, and the variable valve mechanism is controlled in accordance with a compression ratio-changing operation amount of the variable compression ratio mechanism, and
• the valve characteristic of the intake valve or the exhaust valve in the variable valve mechanism is controlled in accordance with the compression ratio-changing operation amount of the variable compression ratio mechanism,
• the spark ignition type internal combustion engine further comprising a phase angle-changing mechanism that changes a valve characteristic, of said valve characteristic of the intake valve or the exhaust valve, which is different from the valve characteristic that is changed by the variable valve mechanism,
• wherein the phase angle-changing mechanism is a timing-related mechanism that is mechanically coupled to the variable compression ratio mechanism and to the variable valve mechanism.