Patent ID: 6713025
Filing Date: 2004-03-30
Classification: B01D,F01N,Y02A,Y02T

Abstract:
A catalyst system for a motor vehicle having an engine with an exhaust port that carries exhaust gases away from the combustion chamber of the engine, wherein the exhaust gases leave the combustion chamber and flow in a downstream direction by first entering the exhaust port, said catalyst system comprising:a shell with at least one conduit extending therefrom and including a downstream end and an exit portion having a diameter formed on the downstream end, the exit portion decreases in diameter in the downstream direction; a conically shaped catalyst disposed contiguous to the exhaust port of the engine and including cells having a cross sectional area, the cross sectional of at least one of the cells of said conically shaped catalyst increases in the downstream direction; and a main brick catalyst having an angled front face disposed downstream of said conically shaped catalyst, wherein said main brick catalyst includes a downstream end having a conically shaped formation having a diameter, said diameter of said conically shaped formation decreases in the downstream direction at a rate greater than the rate at which said exit portion of said shell decreases in diameter in the downstream direction, wherein the shell encloses the main brick catalyst and the at least one conduit houses the conically shaped catalyst and the at least one conduit is attached to the engine and circumscribes the exhaust port when attached, and wherein said conically shaped catalyst includes a rear face disposed at an acute angle from said angled front face of said main brick catalyst.