Patent ID: 6644021
Filing Date: 2003-11-11
Classification: F01N,F02D,F02P,Y02T

Abstract:
An exhaust gas purifying apparatus of an internal combustion engine comprising:a catalyst device provided in an exhaust passage of said internal combustion engine, said catalyst device occluding a sulfur component in exhaust gas when an exhaust gas air-fuel ratio is lean at least; regenerating means for increasing a temperature of said catalyst device to desorb said sulfur component from said catalyst device when the temperature of said catalyst device is not less than a set temperature that is determined within such a range that the occluded sulfur component can be desorbed; frequency estimating means for estimating a frequency, representative of the normalized duration of sulfur regeneration time per unit distance traveled, at which the occluded sulfur component is brought into the state of being emitted; and operation control means for controlling an operation of said regeneration means according to an output of said frequency estimating means.