Patent ID: 6761025
Filing Date: 2004-07-13
Classification: F01N,Y02T

Abstract:
An emissions control system for treating an exhaust gas stream with a reduction agent in an exhaust system of an engine, the emissions control system comprising:a first sensor for determining at least one operating condition of the engine; a control unit connected to the sensor for determining a calculated amount of the reduction agent needed to completely treat the exhaust gas stream; a reduction agent supply source; a first metering means for supplying a first dose of the reduction agent to the exhaust stream, said first dose of reduction agent being less than the calculated amount of the reduction agent needed to completely treat the exhaust gas stream; a reactor having an inlet receiving the exhaust gas stream with the first dose of reduction agent; and a second metering means for supplying a second dose of the reduction agent to the exhaust stream downstream from the reactor inlet.