Recently, several field trial programs have been initiated to evaluate the performance and durability of this EGR-DPF system under US operational conditions. This system has shown 40-60% NOx reduction in addition to >90% CO, HC and PM reductions. The combined EGR-DPF system has been used in Europe over the past 4 years, with over 1200 systems installed on urban buses and other on-road applications. This paper discusses the combination of a diesel particle filter system (DPF) with a low pressure exhaust gas re-circulation (EGR) system to provide four way emission control of NOx, PM, CO and HC from existing heavy duty diesel engines. With growing concerns about NOx and particulate matter (PM) emissions from diesel engines, stricter regulations are being implemented which require advanced emission control technology.
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