Patent attributes
Provided is an engine control apparatus equipped with a three-way catalyst for purifying exhaust gas, a unit for calculating an operational state based on outputs from various sensors, a unit for calculating a fuel injection amount, a unit for driving an injector, a unit for calculating an actual misfire ratio, a catalyst damage determining misfire ratio calculating unit for calculating a misfire determining ratio, a catalyst damaging misfire determining unit for cutting off a supply of fuel when it is determined that a damage-causing misfire state has arisen, a unit for storing an actual misfire ratio at a time when it is determined that the damage-causing misfire state has arisen, and a unit for making a recovery from the cutoff of the fuel supply when the misfire determining ratio has become larger than the misfire ratio at the time of the determination that the damage-causing misfire state has arisen.
