Patent ID: 7441402
Filing Date: 2008-10-28
Classification: F01N,F02B,F02D,Y02T

Abstract:
1. An exhaust gas control apparatus for an internal combustion engine, in which fuel is supplied to a purification mechanism provided in an exhaust passage so that a function of the purification mechanism is recovered, comprising: a sensor which is provided in the exhaust passage, and which performs detection of a flow rate of exhaust gas flowing in the exhaust passage or a value correlated with the flow rate; and a controller which controls fuel supply timing at which the fuel is supplied, based on a result of the detection performed by the sensor; wherein the controller sets the fuel supply timing such that the fuel is supplied not at constant load but at local maximum, when a variation tendency of the flow rate of the exhaust gas changes from an increasing tendency to a decreasing tendency, based on a result of the detection performed by the sensor.