Compact reduction agent doser for use in an scr system of an internal combustion engine

Abstract

An SCR system for use with an IC engine includes a reduction agent doser and a catalytic reactor. The reduction agent doser includes a tubular housing with an inside diameter. A target plate is positioned crosswise in the housing and terminates at a distance from the inside diameter of the housing. The target plate directs a flow of exhaust gas in a radially outward direction. A baffle is positioned crosswise in the housing downstream from the target plate. The baffle terminates at the inside diameter of the housing and includes a center opening for directing a flow of exhaust gas in a radially inward direction. A diffuser plate is located downstream from the baffle. The diffuser plate terminates at the inside diameter of the housing. A catalytic reactor is directly coupled with a downstream side of the reduction agent doser.

1 . An internal combustion (IC) engine, comprising:
 an engine block including a plurality of combustion cylinders;   an exhaust system for receiving exhaust gases from said combustion cylinders, said exhaust system including an exhaust manifold and an exhaust conduit for conducting exhaust gas from the engine; and   an emissions control system, including:
 a reduction agent doser having a tubular housing with an inside diameter, a target plate positioned crosswise in said housing and terminating at a distance from said inside diameter of said housing, said target plate directing a flow of the exhaust gas in a radially outward direction, a baffle positioned crosswise in said housing downstream from said target plate, said baffle terminating at said inside diameter of said housing and including a center opening for directing a flow of the exhaust gas in a radially inward direction, and a diffuser plate located downstream from said baffle, said diffuser plate terminating at said inside diameter of said housing; and 
 a catalytic reactor coupled with a downstream side of said reduction agent doser. 
   
     
     
         2 . The IC engine of  claim 1 , wherein said catalytic reactor has a flow path diameter which is approximately the same as said inside diameter of said housing. 
     
     
         3 . The IC engine of  claim 1 , wherein said target plate is a circular disk-shaped plate, and said baffle is annular shaped with a circular center opening. 
     
     
         4 . The IC engine of  claim 1 , wherein said catalytic reactor is directly coupled to a downstream side of said reduction agent doser. 
     
     
         5 . The IC engine of  claim 1 , wherein said target plate is a heated target plate. 
     
     
         6 . The IC engine of  claim 1 , wherein said diffuser plate is a perforated plate. 
     
     
         7 . The IC engine of  claim 1 , wherein said emissions control system includes a reduction agent injector for injecting a fluid reduction agent toward said target plate. 
     
     
         8 . The IC engine of  claim 1 , wherein said reduction agent doser is a urea doser. 
     
     
         9 . A reduction agent doser for use in an emissions control system for an internal combustion (IC) engine, said reduction agent doser comprising:
 a tubular housing with an inside diameter;   a target plate positioned crosswise in said housing and terminating at a distance from said inside diameter of said housing, said target plate directing a flow of exhaust gas in a radially outward direction;   a baffle positioned crosswise in said housing downstream from said target plate, said baffle terminating at said inside diameter of said housing and including a center opening for directing a flow of exhaust gas in a radially inward direction; and   a diffuser plate located downstream from said baffle, said diffuser plate terminating at said inside diameter of said housing.   
     
     
         10 . The reduction agent doser of  claim 9 , wherein said target plate is a circular disk-shaped plate, and said baffle is annular shaped with a circular center opening. 
     
     
         11 . The reduction agent doser of  claim 9 , wherein said target plate is a heated target plate. 
     
     
         12 . The reduction agent doser of  claim 9 , wherein said diffuser plate is a perforated plate. 
     
     
         13 . The reduction agent doser of  claim 9 , including a reduction agent injector for injecting a fluid reduction agent toward said target plate. 
     
     
         14 . The reduction agent doser of  claim 9 , wherein said reduction agent doser is a urea doser. 
     
     
         15 . A selective catalytic reduction (SCR) system for use with an internal combustion (IC) engine, comprising:
 a reduction agent doser including:
 a tubular housing with an inside diameter; 
 a target plate positioned crosswise in said housing and terminating at a distance from said inside diameter of said housing, said target plate directing a flow of exhaust gas in a radially outward direction; 
 a baffle positioned crosswise in said housing downstream from said target plate, said baffle terminating at said inside diameter of said housing and including a center opening for directing a flow of exhaust gas in a radially inward direction; and 
 a diffuser plate located downstream from said baffle, said diffuser plate terminating at said inside diameter of said housing; and 
   a catalytic reactor directly coupled with a downstream side of said reduction agent doser.   
     
     
         16 . The reduction agent doser of  claim 15 , wherein said target plate is a circular disk-shaped plate, and said baffle is annular shaped with a circular center opening. 
     
     
         17 . The reduction agent doser of  claim 15 , wherein said target plate is a heated target plate. 
     
     
         18 . The reduction agent doser of  claim 15 , wherein said diffuser plate is a perforated plate. 
     
     
         19 . The reduction agent doser of  claim 15 , wherein said reduction agent doser includes a reduction agent injector for injecting a fluid reduction agent toward said target plate. 
     
     
         20 . The reduction agent doser of  claim 15 , wherein said reduction agent doser is a urea doser.