Patent ID: 6233927
Filing Date: 2001-05-22
Classification: F01N,Y10S

Abstract:
An exhaust gas purification device, comprising a NO.sub.x absorbent arranged in an exhaust passage of an engine for absorbing NO.sub.x therein when an air-fuel ratio of an exhaust gas flowing into the NO.sub.x absorbent is lean, the NO.sub.x absorbent discharging NO.sub.x therein when a concentration of the oxygen in the exhaust gas flowing into the NO.sub.x absorbent decreases,a trapping element arranged in the exhaust passage upstream of the NO.sub.x absorbent for trapping particulates,a processing element for processing the particulates trapped in the trapping element to regenerate the trapping element, anda preventing element for preventing the exhaust gas flowing out of the trapping element from flowing into the NO.sub.x absorbent when the trapping element is regenerated.