Cummins gets inside 'Bin 5' Tier 2 in lab tests on light-truck diesel engine. Workshop Highlights

Diesel Fuel News, Sept 16, 2002

A 4.2 liter V-6 diesel, as installed on a Dodge light truck with a combined NOx trap/diesel particle filter (DPF), got inside the key "Bin 5" Tier 2 and California "LEV-2" emissions limits in urban dyno drive schedule (UDDS) laboratory tests, Cummins engineer John Stang revealed here. This diesel vehicle gets 60% better fuel economy than the gasoline equivalent.

Tests used a <4-ppm sulfur, 48 cetane fuel. Rich/lean combustion conditions for NOx trap and DPF regeneration were created by pilot, main and post-injection schemes. An exhaust temp sensor, two oxygen sensors and exhaust pressure sensors were paired with a four-way NOx/PM/HC/CO catalyst. Remaining research will focus on lower-cost, simpler, more robust and compact emissions systems that can tolerate a wider variability of fuels in the field, he said. Reducing EGR cylinder variability also would aid emissions strategies, as even small variations can penalize EGR and cause hig her engine-out NOx, Stang pointed out.