Exhaust gas purification system for lean burn engine

Details Exhaust gas purification system for lean burn engine Exhaust gas purification system for lean burn engine

F - Mech Eng,Light,Heat,Weapons

01

N

F01N 3/18 (2006.01) B01D 53/94 (2006.01) F01N 3/20 (2006.01) F02B 37/16 (2006.01) F02B 75/10 (2006.01)

Patent

CA 2329090

An exhaust gas purification system for an engine equipped with a turbocharger and an exhaust pipe having a NO x conversion catalyst therein. The system comprises a reservoir for storing pressurized air received from the turbocharger, a reductant injector in fluid communication with a reductant supply, and a mixing chamber in fluid communication with the reservoir and connected to the reductant injector. The reductant injector is responsive to an injection signal for atomizing and injecting a quantity of reductant into the mixing chamber. The mixing chamber is in fluid communication with the exhaust pipe for introducing a quantity of air and reductant mixture into the exhaust gas flow upstream of the NO x conversion catalyst. In one aspect of the invention, the system includes an engine control unit, a valve connected between the reservoir and the mixing chamber, and a differential pressure transducer positioned between the mixing chamber and the exhaust pipe for measuring the pressure differential across the mixing chamber and exhaust pipe upstream of the NO x conversion catalyst. The engine control unit controls the valve to introduce a quantity of pressurized air from the reservoir into the mixing chamber to maintain the pressure differential between the mixing chamber and exhaust pipe substantially constant.

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