| 摘要 |
PURPOSE:To satisfactorily hold the composition of exhaust gas over the entire operating range of an engine, by compensating the supply amount of fuel so that variations in air-fuel ration due to a fuel amount reserved in an intake-air system is compensated. CONSTITUTION:A fuel amount computing means 101 computes a fuel supply amount in accordance with the engine operating condition, and an equilibrium value computing means 102 computes an equilibrium value for a supply amount reserved in an engine air-intake system. Further, a subtracting means 103 computes the difference between the above-mentioned equilibrium value and a predicted value thereof, and an over- or under-amount computing means 104 computes an over- or under-fuel amount per cycle in accordance with the above-mentioned difference. Further, a predicted value computing means 105 computes a predicted value for the present equilibrium value in accordance with the over- or under-fuel amount and the predicted value for the previous equilibrium value. Then, a fuel amount compensating means 106 compensates the supply fuel amount in accordance with the over- or under-fuel amount, and a secondary air supply means 107 is allowed to feed secondary air when the compensated fuel amount becomes below a predetermined value.
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