Patent ID: 8621846

Claim:
An exhaust gas treatment system for an internal combustion engine comprising: an exhaust gas conduit having a central longitudinal axis and configured to receive exhaust gas from an exhaust port of an internal combustion engine and to deliver the exhaust gas downstream to an exhaust treatment device; an injector bay extending outwardly from the exhaust gas conduit upstream of the exhaust treatment device; an exhaust fluid injector mounted through an opening in the injector bay, in fluid communication with the exhaust gas in the exhaust gas conduit, and oriented in an upstream direction to deliver an exhaust fluid to the downstream flowing exhaust gas in the upstream direction; and an exhaust flow baffle extending outwardly from the injector bay into the exhaust gas and extending past the central longitudinal axis in an upstream direction, the exhaust flow baffle having an arcuate upstream face that is outwardly facing in the upstream direction and configured to separate the flow of exhaust gas thereabout, the exhaust flow baffle located upstream of the exhaust fluid injector and extending into the exhaust gas conduit from within the injector bay to define a turbulent, low pressure, low velocity field downstream thereof and proximate to the exhaust fluid injector and operable to entrain the delivered exhaust fluid, wherein the exhaust fluid is sprayed into the turbulent, low pressure, low velocity field, and wherein the exhaust flow baffle is coupled to a wall of the injector bay.