Patent ID: 6832474
Filing Date: 2004-12-21
Classification: F01N,Y02T

Abstract:
An exhaust gas purification device of an engine, comprising:a catalyst disposed in an exhaust gas pipe of the engine for purification of an exhaust gas; a secondary air injection device that injects a secondary air into the exhaust gas pipe upstream of the catalyst so as to accelerate a warm-up of the catalyst at a time of a startup of the engine; a controller that: determining a degree of the warm-up of the catalyst; calculates a criterion output based on the determined degree of the warm-up of the catalyst; detects an output of the engine; and stops injection of the secondary air with an injection stop device provided that: the determined degree of the warm-up is greater than or equal to a predetermined criterion degree of the warm-up; and the detected output of the engine is greater than or equal to the calculated criterion output.