Exhaust Gas Filter System

Abstract

An exhaust gas filter system in which an asymmetrical channel, in which the diameter of an inlet being opened is larger than that of an outlet disposed and opened at a rear end surface, is formed, may include a first coating layer that is formed at an inner surface of a front portion of the channel by coating a first wash coat, and a second coating layer that is formed at an inner surface of a rear portion of the channel by coating a second wash coat, wherein inner cross section of the front portion is wider than inner cross section of the rear portion.

1 . An exhaust gas filter system in which an asymmetrical channel, in which the diameter of an inlet being opened is larger than that of an outlet disposed and opened at a rear end surface, is formed, comprising:
 a first coating layer that is formed at an inner surface of a front portion of the channel by coating a first wash coat; and   a second coating layer that is formed at an inner surface of a rear portion of the channel by coating a second wash coat;   wherein inner cross section of the front portion is wider than inner cross section of the rear portion.   
     
     
         2 . The exhaust gas filter system of  claim 1 , wherein the thickness of the second coating layer is equal to or smaller than that of the first coating layer. 
     
     
         3 . The exhaust gas filter system of  claim 1 , wherein the first coating layer is formed in the front portion and the second coating layer is formed in the rear portion of the filter on the basis of a center line thereof. 
     
     
         4 . The exhaust gas filter system of  claim 3 , wherein the volume of the first wash coat that is used for the first coating layer is approximately twice as large as that of the second wash coat that is used for the second coating layer. 
     
     
         5 . The exhaust gas filter system of  claim 4 , wherein the weight of a noble metal that is contained in the first wash coat is equal to that of the noble metal that is contained in the second wash coat, and the concentration (weight/volume) of the noble metal is varied according to the weight of the noble metal. 
     
     
         6 . The exhaust gas filter system of  claim 1 , wherein a plurality of channels are formed in a flow direction of exhaust gas, the inlet of at least one among the channels is opened and the outlet thereof is closed, the inlet of at least another one among the channels is closed and the outlet thereof is opened, and the closed portions of the inlets are alternatively disposed and the closed portions of the outlets are alternatively disposed. 
     
     
         7 . The exhaust gas filter system of  claim 1 , wherein the front portion of the filter is soaked in a first wash coat liquid and the rear portion of the filter is soaked in a second wash coat liquid so as to respectively form the first coating layer and the second coating layer. 
     
     
         8 . The exhaust gas filter system of  claim 7 , wherein the thickness of the first coating layer is adjusted by controlling the used volume of the first wash coat. 
     
     
         9 . A passenger vehicle comprising an engine and the exhaust gas filter system of  claim 1 .