Patent ID: 6467257
Filing Date: 2002-10-22
Classification: F01N,F02B,F02M,Y02T

Abstract:
An integrated system for treating exhaust gas emissions from an engine, said system comprising:an exhaust gas recirculation system for inserting a portion of the exhaust gas flow into the flow of intake air into the engine, wherein the exhaust gas recirculation system has a recirculation flow line, and wherein the flow line has a first orifice and a second orifice, each orifice operable to restrict flow of exhaust through the flow line; wherein the first orifice is upstream of the second orifice, smaller than the second orifice, and configurable from open to closed; a selective catalytic reduction system placed in the exhaust gas flow downstream of the engine in parallel to said exhaust gas recirculation system; and a particulate filter placed in the exhaust gas flow downstream and in series with said selective catalytic reduction system.