Patent ID: 6352491
Filing Date: 2002-03-05
Classification: B60W,F02D,F16H,Y10T

Abstract:
A fuel supply amount control apparatus for a spark ignition type internal combustion engine that is installed in a vehicle and that allows a lean combustion of a mixture in which a proportion of fuel is less than in a mixture having a stoichiometric air-fuel ratio, the fuel supply amount control apparatus comprising:idling control amount calculating means for calculating an idling control amount for keeping a revolution speed of the internal combustion engine at a target idle revolution speed during an idling state of the engine; fuel supply amount adjusting means for adjusting an amount of fuel supplied to the engine based on the idling control amount if the lean combustion is conducted during the idling state; and vehicle run-time fuel supply amount correcting means for determining the amount of fuel supplied for the lean combustion during a run of the vehicle using a control amount obtained by reducing the idling control amount.