Passive SCR performance under pseudo-transient cycle: challenges and opportunities for meeting Tier 3 emissions
Vitaly Prikhodko, Oak Ridge National Laboratory
The performance of a passive SCR that included a closed-couple TWC and an underfloor SCR catalysts was evaluated under GM provided 6-mode pseudo-transient cycle. Engine operating strategies were investigated for NOx control to meet tier 3 emissions regulations. The presentation discusses challenges and opportunities for meeting Tier 3 NOx+HC and CO emissions, and proposed catalyst system architecture to meet Tier 3 emissions while maximizing fuel savings.