Exhaust gas system

Abstract

A vehicle, comprising a vehicle body, an internal combustion engine coupled to the vehicle body and including an exhaust gas manifold, and an exhaust gas system coupled to the vehicle body. The exhaust gas system comprising a primary catalyst that includes a main body having a first end, a second end spaced from the first end, and at least one wall extending between the first end and the second end, an inlet coupled to the first end, and an outlet coupled to the second end. The main body being arranged downstream of the internal combustion engine and the inlet being communicatively coupled to the exhaust gas manifold. The exhaust gas system further including a heat source arranged about a portion of the main body and configured to supply heat to the primary catalyst during a catalytic light-off (CLO) period.

1 . A vehicle, comprising:
 a vehicle body;   an internal combustion engine coupled to the vehicle body and including an exhaust gas manifold; and   an exhaust gas system coupled to the vehicle body, the exhaust gas system comprising:
 a primary catalyst, comprising:
 a main body arranged downstream of the internal combustion engine and having a first end, a second end spaced from the first end, and at least one wall extending between the first end and the second end, the at least one wall defining a circumference that extends between the first end and the second end, 
 an inlet coupled to the first end and communicatively coupled to the exhaust gas manifold, and 
 an outlet coupled to the second end; and 
 
 a heat source arranged about a portion of the main body and configured to supply heat to the primary catalyst during a catalytic light-off (CLO) period, the heat source is arranged about the circumference adjacent the first end and is controlled (i) based on a temperature of the primary catalyst during the CLO period and (ii) to reduce or terminate heating after the primary catalyst reaches its light-off temperature. 
   
     
     
         2 - 4 . (canceled) 
     
     
         5 . The vehicle of  claim 1 , wherein the heat source comprises a secondary catalyst arranged downstream of the internal combustion engine. 
     
     
         6 . The vehicle of  claim 5 , wherein the exhaust gas system further includes a valve communicatively coupled to the exhaust gas manifold, the primary catalyst, and the secondary catalyst. 
     
     
         7 . The vehicle of  claim 6 , wherein the valve is configured to direct flow towards the primary catalyst or the secondary catalyst depending on the temperature of the primary catalyst. 
     
     
         8 . The vehicle of  claim 7 , wherein the primary catalyst is configured to operate at a first temperature range and the secondary catalyst is configured to operate at a second temperature range that is different from the first temperature range. 
     
     
         9 - 10 . (canceled) 
     
     
         11 . An exhaust gas system, comprising:
 an inlet arranged at a first end;   an outlet arranged at a second end;   a primary catalyst including a first face;   a secondary catalyst including a second face and arranged radially about the primary catalyst;   a thermal interface disposed radially_between the primary catalyst and the secondary catalyst, the thermal interface being in direct thermal contact with both the primary catalyst and the secondary catalyst and configured to transfer heat from the secondary catalyst to the primary catalyst during a catalytic light-off (CLO) period of the primary catalyst; and   a valve arranged axially between the inlet and the first and second faces, the valve having a first position that prevents exhaust gas from reaching the first face during the CLO period of the primary catalyst, and a second position that directs exhaust gas toward the first face after the primary catalyst has reached its light-off temperature, the primary catalyst and the secondary catalyst are arranged relative to the inlet and the outlet, the first face and the second face are coplanar, and the valve is controlled based on a temperature of the primary catalyst to remain in the first position during the CLO period and to move to the second position after the primary catalyst reaches its light-off temperature.   
     
     
         12 - 14 . (canceled) 
     
     
         15 . The exhaust gas system of  claim 11 , wherein the primary catalyst is configured to operate at a first temperature range and the secondary catalyst is configured to operate at a second temperature range that is included in the first temperature range. 
     
     
         16 . An exhaust gas aftertreatment device, comprising:
 a primary catalyst including a first face and made of a platinum group material;   a secondary catalyst including a second face and arranged radially about the primary catalyst, the first face and the second face being coplanar, the secondary catalyst being arranged concentrically about the primary catalyst, and the secondary catalyst being configured to achieve a catalytic light-off temperature prior to the primary catalyst; and   a thermal interface disposed radially between the primary catalyst and the secondary catalyst, the thermal interface being in direct thermal contact with both the primary catalyst and the secondary catalyst and configured to transfer heat from the secondary catalyst and the primary catalyst during a catalytic light-off (CLO) period.   
     
     
         17 . The exhaust gas aftertreatment device of  claim 16 , wherein the platinum group material consists of at least one of: ruthenium, rhodium, palladium, osmium, iridium, and platinum. 
     
     
         18 . The exhaust gas aftertreatment device of  claim 17 , wherein the secondary catalyst consists of at least one of: hopcalite, perovskite, and platinized tin oxide. 
     
     
         19 - 20 . (canceled) 
     
     
         21 . The vehicle of  claim 8 , wherein the secondary catalyst is made of at least one material selected from the group consisting of hopcalite, perovskite, and platinized tin oxide. 
     
     
         22 . The vehicle of  claim 21 , wherein the exhaust gas system further comprises a thermal interface between the primary catalyst and the secondary catalyst, the thermal interface being configured to transfer heat from the secondary catalyst to the primary catalyst during the CLO period. 
     
     
         23 . The vehicle of  claim 8 , wherein the secondary catalyst is configured to achieve a catalytic light-off temperature prior to the primary catalyst. 
     
     
         24 . The exhaust gas system of  claim 11 , further comprising a flow funnel arranged axially between the inlet and the first and second faces, the flow funnel including a first opening and a second opening spaced from the first opening and being generally concentric with the primary catalyst so that a majority of exhaust gas that passes the inlet is directed at the first face. 
     
     
         25 . The exhaust gas system of  claim 11 , further comprising a flow funnel arranged axially between the inlet and the first and second faces and including a first opening and a second opening spaced from the first opening, wherein the valve is arranged with respect to the first opening of the flow funnel. 
     
     
         26 . The exhaust gas system of  claim 11 , wherein the primary catalyst is made of a platinum group material consisting of at least one of: ruthenium, rhodium, palladium, osmium, iridium, and platinum. 
     
     
         27 . The exhaust gas system of  claim 11 , wherein the secondary catalyst consists of at least one of: hopcalite, perovskite, and platinized tin oxide. 
     
     
         28 . The exhaust gas system of  claim 11 , wherein the secondary catalyst is configured to achieve a catalytic light-off temperature prior to the primary catalyst. 
     
     
         29 . The exhaust gas aftertreatment device of  claim 16 , further comprising an inlet arranged at a first end, an outlet arranged at a second end, and a flow funnel arranged axially between the inlet and the first and second faces, the flow funnel including a first opening and a second opening spaced from the first opening and being generally concentric with the primary catalyst so that a majority of exhaust gas that passes the inlet is directed at the first face. 
     
     
         30 . The exhaust gas aftertreatment device of  claim 16 . wherein the primary catalyst is configured to operate at a first temperature range and the secondary catalyst is configured to operate at a second temperature range that is included in the first temperature range.