HIGH EXPANSION RATIO INTERNAL COMBUSTION ENGINE

摘要

Disclosed is a high expansion ratio internal combustion engine accomplished by utilizing a variable valve mechanism in which makes the phase of a part of a plurality of intake valves provided in respective cylinders is variable and the phase of the remaining intake valves is invariable. The high expansion ratio internal combustion engine comprises a variable compression ratio mechanism for changing the mechanical compression ratio of the internal combustion engine, and a variable valve mechanism in which the phase of a part of a plurality of intake valves is variable and the phase of the remaining intake valves is fixed. The action angle of the variable phase intake valve is set larger than the action angle of the fixed phase intake valve. The valve opening timing of the variable phase intake valve is set to lag behind the valve opening timing of the fixed phase intake valve when the internal combustion engine is in low load driving state.