Patent ID: 6698193
Filing Date: 2004-03-02
Classification: F01N,Y02A

Abstract:
Exhaust-gas cleaning system for an internal combustion engine, in particular for a motor vehicle, having a catalytic converter housing with an associated exhaust catalytic converter and an inlet opening for connecting an exhaust pipe,wherein the catalytic converter is a starting catalytic converter arranged close to the engine, wherein a throttle element is arranged in the catalytic converter housing in such a manner that a first reaction chamber, which lies between the throttle element and the inlet opening, and a second reaction chamber, which lies between throttle element and exhaust catalytic converter, are formed by the throttle element, wherein the throttle element has a wall which is curved opposite to the direction of flow, and wherein the throttle element is a perforated metal sheet with a uniform distribution of circular holes therethrough, the holes forming between 40% to 90% of the surface area of the perforated metal sheet exposed to gas flows, said holes being configured to throttle and impart swirling flow to gases passing therethrough.