Patent ID: 7143577
Filing Date: 2006-12-05
Classification: F01N,F02D,Y02T

Abstract:
1. An air-fuel ratio control apparatus of an internal combustion engine in which an exhaust gas purifying catalyst is disposed in an exhaust passage, comprising: fuel cut means which stops fuel supply to the internal combustion engine when it is determined that a number of revolutions of the internal combustion engine is higher than a fuel cut number of revolutions at the time of deceleration of the internal combustion engine, the fuel cut number of revolutions being set as a number of revolutions of the internal combustion engine for determining whether a stop of the fuel supply should be started; and changing means of the fuel cut number of revolutions for changing the fuel cut number of revolutions according to a physical amount which correlates with an amount of oxygen discharged from the & exhaust gas purifying catalyst during a fuel increasing operation of the internal combustion engine such that as the amount of oxygen is greater, the fuel cut number of revolutions is reduced.