Patent ID: 7412954

Claim:
A start-up control device for an internal combustion engine, comprising: a device which supplies a fuel to the internal combustion engine; a starter motor which cranks the internal combustion engine; a sensor which detects an engine rotation speed of the internal combustion engine; a sensor which detects an operating parameter other than the engine rotation speed of the internal combustion engine; an effective compression ratio modifying mechanism which alters an effective compression ratio of the internal combustion engine from an effective compression ratio for a start-up operation to a larger effective compression ratio for a normal operation when the engine rotation speed increases beyond a resonance rotation speed region during cranking; and a programmable controller programmed to: determine whether or not the internal combustion engine has reached a combustion possible state on the basis of the engine rotation speed during cranking and the operating parameter other than the engine rotation speed; and inhibit fuel supply by the fuel supply device when the internal combustion engine has not reached the combustion possible state, even when the engine rotation speed has increased beyond the resonance rotation speed region.