Asymmetric catalyst cone for swirl induction of exhaust gas flow

A vehicle comprising:

• an internal combustion engine configured to generate a flow of exhaust gas as a byproduct of generating power;
• and
• an exhaust system connected to the engine and having an after-treatment (AT) system for the flow of exhaust gas, the AT system including:
• a first AT device including a first AT device cone having:
• a cone inlet defined by an inlet surface area having a first geometric center;
• and
• a cone outlet defined by an outlet surface area having a second geometric center;
• a second AT device positioned in the flow of exhaust gas downstream of the first AT device and configured to reduce concentration of a pollutant;
• an exhaust passage configured to carry the flow of exhaust gas from the cone outlet of the first AT device cone to the second AT device;
• and
• an injector configured to introduce a reductant into the flow of exhaust gas carried by the exhaust passage;
• wherein:
• the first AT device cone has no plane of symmetry;
• the first geometric center is arranged at a predetermined distance from the second geometric center;
• the inlet surface area is greater than the outlet surface area by a predetermined ratio;
• and
• the predetermined distance and the predetermined ratio are together configured to induce swirl in the flow of exhaust gas and mix the introduced reductant with the flow of exhaust gas carried by the exhaust passage.