Mercedes-Benz today announced that it intends to offer BLUETEC diesel-powered versions of its M-, R- and GL-Class sport-utility vehicles that will meet EPA Tier 2 Bin 5 and CA LEV II emissions standards in the US beginning in CY 2008. (Earlier post.)
When the Mercedes E320 BLUETEC hits salesrooms shortly, it will be as a 45-state compliant vehicle, not a 50-state vehicle. (Earlier post.)
To tackle the difficult NOx target in the Bin 5/Lev II standard, DaimlerChrysler has defined two technology approaches.
The E320 BLUETEC uses a newly developed NOx adsorber, a catalytic device that converts NOx to nitrogen. Subsequent family members are slated to use urea-based injection system for NOx reduction. The adsorber has a lower conversion efficiency than the urea SCR systems.
Accordingly, the BLUETEC M-, R- and GL-Class vehicles will use the AdBlue urea SCR system.
Honda is developing a diesel engine and aftertreatment system that does not require the use of urea SCR to meet Bin 5 targets. The company has a target introduction of 2009. (Earlier post.)