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Exhaust Aftertreatment Systems for Gasoline and Alternative-Fueled Engines with Reduction of HC, CO, NOX and PM

Abstract: 

An exhaust gas emissions aftertreatment system for spark-ignition engines, which simultaneously reduces the particulate matter, HC, CO, and NOx content of the exhaust. Various embodiments of the system have both a closely-coupled TWC device, and an under-floor treatment device. The under-floor device has either TWC or NOx reduction functionality, depending on whether the engine is run under stiochiometric or lean burn operating conditions.

Patent Number: 
8,522,536
Date Of Issue: 
09/03/2013
Inventors: 

Rijing Zhan; Phillip A. Weber