Exhaust gas burner assembly

An exhaust system for a vehicle having an internal combustion engine, the exhaust system comprising:

• an exhaust pipe having a central axis and configured to receive an exhaust gas flow from the engine;
• a catalytic converter disposed within the exhaust pipe;
• and
• an exhaust gas burner assembly having a burner unit configured to generate and supply a heated burner flow to a supply pipe,
• wherein an outlet end of the supply pipe is disposed within the exhaust pipe and extends substantially parallel to the exhaust pipe central axis such that the exhaust gas flows around the supply pipe outlet end,
• wherein a plurality of mixing apertures are formed in the supply pipe outlet end and configured to promote mixing of the heated burner flow and the exhaust gas flow to disperse heat over the catalytic converter for rapid heating thereof,
• wherein the exhaust pipe and the supply pipe outlet end are coaxial,
• wherein the plurality of mixing apertures face in a direction substantially perpendicular to a direction of the exhaust gas flow as it flows over and around the outlet end,
• wherein the burner unit is disposed outside of the exhaust pipe and the supply pipe extends through a wall in the exhaust pipe,
• wherein each mixing aperture of the plurality of mixing apertures has a diameter of between approximately 5.0 mm and approximately 10 mm, and
• wherein the plurality of mixing apertures includes between eight mixing apertures and twelve apertures.