Patent ID: 8291696
Filing Date: 2012-10-23
Classification: B01F,F01N,Y02T

Abstract:
1. An internal combustion engine comprising an exhaust system through which exhaust gas created by combustion in engine combustion chambers passes to atmosphere and which comprises an after-treatment device that treats the exhaust gas before the exhaust gas leaves the exhaust system, wherein the after-treatment device comprises: an inlet through which exhaust gas enters the device; a particulate filter disposed between the inlet and a mixing zone; a catalyst disposed between the mixing zone and an outlet through which exhaust gas that has passed through the device exits the device for enabling catalytic reaction that treats the exhaust gas; an upper flow passage and a lower flow passage through which exhaust gas that has been filtered by the particulate filter enters the mixing zone at respective velocities that are greater than a velocity at which the exhaust gas leaves the particulate filter; and an injector for injecting material useful in accomplishing treatment of the exhaust gas into the exhaust gas through a nozzle aimed toward the mixing zone along a slant direction to, and across, flow entering the mixing zone through the upper flow passage and ultimately toward a far wall of the mixing zone relative to the nozzle; and wherein exhaust flow entering the mixing zone through the lower flow passage enters the mixing zone between the upper flow passage and the far wall, at a velocity higher than the velocity of the exhaust flow through the upper flow passage.