Cummins Westport Near-Zero Emissions Natural Gas Engines

ISL G platform:

• Stoichiometric
• Three Way Catalyst Aftertreatment
• Cooled EGR

Additional work required to achieve near-zero NOx:

• Cold-cycle emissions, near-zero NOx has been demonstrated over hot cycles
• Transient emissions, optimize control system for low NOx during transient events
• Emissions variability (engine to engine, test to test)

http://www.socalgas.com/documents/news-room/presentations/Cummins_Westport_Near_Zero_Emissions_112911.pdf