Patent ID: 7146963

Claim:
A state determination device for an internal combustion engine, said internal combustion engine including a first fuel injection mechanism injecting fuel into a cylinder and a second fuel injection mechanism injecting fuel into an intake manifold, comprising: a first control unit controlling said fuel injection mechanism so that the fuel is injected solely from said first fuel injection mechanism in a first injection region; a second control unit controlling said fuel injection mechanism so that the fuel is injected solely from said second fuel injection mechanism in a second injection region; a third control unit controlling said fuel injection mechanism so that the fuel is injected from said first fuel injection mechanism and said second fuel injection mechanism in a third injection region; an intake air amount detection unit detecting an amount of air suctioned into said internal combustion engine; a calculation unit calculating an amount of fuel injection from said fuel injection mechanism based on the amount of air; an air-fuel ratio detection unit detecting an air-fuel ratio; a first determination unit determining a state of said fuel injection mechanism based on the air-fuel ratio in at least any two of said first injection region, said second injection region and said third injection region; and a second determination unit determining a state of said intake air amount detection unit based on a result of determination by said first determination unit.