| 摘要 |
To provide a fuel cutoff control method for an engine including a secondary air introducing system, capable of preventing afterburning in an exhaust pipe at the time of fuel being cut off in a decelerating state of the engine.A fuel cutoff control method during deceleration of an engine including a secondary air introducing pipe connected to an exhaust pipe, and an air cut valve provided on the secondary air introducing pipe, the method comprising a determination step of determining under predetermined condition's whether or not the engine is in a decelerating state, wherein in the decelerating state, a greater amount of fuel than a normally required amount of fuel flow is supplied during a predetermined period of time after the start of deceleration, and then fuel is cut off after the predetermined period of time has elapsed.
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