Aftertreatment Module with Sensor Mounting Arrangement

Abstract

An aftertreatment module includes a conduit defining a flow path and an aperture into the flow path. A shield is arranged at least partway around the conduit and spaced therefrom, the shield including an opening in registration with the aperture. A boss is provided on the conduit, the boss having a through-hole in registration with the aperture. A sensor is disposed within the boss so as to extend at least partway into the flow path. A spacer is arranged around the boss. The sensor extends through the opening, and the shield further includes an inner portion for engagement with the spacer.

1 . An aftertreatment module comprising:
 a conduit defining a flow path and an aperture into the flow path;   a shield arranged at least partway around the conduit and spaced therefrom, the shield including an opening in registration with the aperture;   a boss provided on the conduit and having a through-hole in registration with the aperture;   a sensor disposed within the boss so as to extend at least partway into the flow path; and   a spacer arranged around the boss; and   wherein the sensor extends through the opening and the shield further comprises an inner portion for engagement with the spacer.   
     
     
         2 . An aftertreatment module according to  claim 1 , wherein the spacer is made from a dense wire mesh. 
     
     
         3 . An aftertreatment module according to  claim 1 , wherein the spacer is made from an insulating material. 
     
     
         4 . An aftertreatment module according to  claim 1 , wherein the spacer is made from a compressible material. 
     
     
         5 . An aftertreatment module according to  claim 1 , wherein the shield comprises a cap portion comprising an aperture through which the sensor extends, an inner portion for engagement with the spacer, and an outer portion for engagement with the shield. 
     
     
         6 . An aftertreatment module according to  claim 5 , wherein the cap portion comprises a recess in an exterior profile of the shield. 
     
     
         7 . An aftertreatment module according to  claim 6 , wherein the recess is cup-shaped. 
     
     
         8 . An aftertreatment module according to  claim 6 , wherein the exterior profile of the recess monotonically decreases towards a lowest point. 
     
     
         9 . An aftertreatment module according to  claim 5 , wherein the spacer forms at least a partial seal between the boss and the cap portion. 
     
     
         10 . An aftertreatment module according to  claim 1 , wherein the sensor is disposed within the boss such that non-sensing elements of the sensor are located exterior to the conduit. 
     
     
         11 . An aftertreatment module according to  claim 1 , wherein the boss is welded to the conduit. 
     
     
         12 . An aftertreatment module according to  claim 1 , wherein the boss is made of stainless steel. 
     
     
         13 . An aftertreatment module according to  claim 1 , wherein the shield is made of stainless steel. 
     
     
         14 . An aftertreatment module according to  claim 10 , wherein the cap is made of stainless steel. 
     
     
         15 . An aftertreatment module according to  claim 2 , wherein the shield comprises a cap portion comprising an aperture through which the sensor extends, an inner portion for engagement with the spacer, and an outer portion for engagement with the shield. 
     
     
         16 . An aftertreatment module according to  claim 15 , wherein the cap portion comprises a recess in an exterior profile of the shield. 
     
     
         17 . An aftertreatment module according to  claim 3 , wherein the shield comprises a cap portion comprising an aperture through which the sensor extends, an inner portion for engagement with the spacer, and an outer portion for engagement with the shield. 
     
     
         18 . An aftertreatment module according to  claim 17 , wherein the cap portion comprises a recess in an exterior profile of the shield. 
     
     
         19 . An aftertreatment module according to  claim 4 , wherein the shield comprises a cap portion comprising an aperture through which the sensor extends, an inner portion for engagement with the spacer, and an outer portion for engagement with the shield. 
     
     
         20 . An aftertreatment module according to  claim 19 , wherein the cap portion comprises a recess in an exterior profile of the shield.