Patent ID: 7401605

Claim:
A fuel injection control system for an engine, the engine comprising a manifold pressure sensor, a calculating unit for calculating a fuel injection amount according to an output from the manifold pressure sensor, a throttle opening sensor, and a correction unit for correcting the fuel injection amount according to a throttle opening θ Th, said fuel injection control system comprising: a throttle body having a throttle valve in which a fully opened position θ Thful of the throttle opening θ Th is an angle substantially equal to 90°, said throttle body being configured so that a throttle valve is capable of being turned to a over-fully opened position θ Thex that has an angle greater than the angle of the fully opened position θ Thful that corresponds to a saturation air flow rate of air flowing into the engine, and where the saturation air flow rate is maintained when the throttle valve is in the over-fully opened position θ Thex; and a correction unit for correcting the fuel injection amount to a lean side of a fuel-air mixture when said throttle valve is turned from a fully closed position to the fully opened position θ Thful and for correcting the fuel injection amount to a rich side of the fuel-air mixture according to an increase in the throttle opening θ Th when the throttle valve is turned to an angle beyond the fully opened position θ Thful to said over-fully opened position θ Thex.