Patent ID: 7614221
Filing Date: 2009-11-10
Classification: B01D,F01N,Y02T

Abstract:
1. An exhaust system for an internal combustion engine, comprising: a catalytic device within an exhaust path of the engine, wherein the catalytic device includes a housing with a catalyst carrier, and wherein a length of the catalyst carrier along a longitudinal axis, measured along a downstream flow direction of exhaust gas within the exhaust path, is the same as or shorter than an upstream distance traveled by a reverse flow of exhaust gas during an exhaust gas pulsation within the housing, and wherein the catalyst carrier is spaced along the longitudinal axis from any other exhaust gas purifying device in the housing by a distance the same as or greater than the upstream distance traveled by the reverse flow; wherein the catalyst carrier includes a first catalyst carrier in the housing and a second catalyst carrier in the housing downstream from the first catalyst carrier, wherein a distance between the first catalyst carrier and the second catalyst carrier is substantially the same as the upstream distance traveled by the exhaust reverse-flow such that exhaust as that enters the second catalyst carrier does not enter the first catalyst carrier during reverse flow.