Automobilewoche reports that Volkswagen and its premium Audi unit, BMW and DaimlerChrysler’s Mercedes-Benz will all use the BLUETEC system developed by Mercedes-Benz and Bosch to meet US Tier 2 Bin 5 requirements for diesel light-duty vehicles starting in 2008. (Earlier post.)
Volkswagen and DaimlerChrysler have already confirmed the arrangement; BMW and DaimlerChrysler reportedly will finalize details on 12 October.
BLUETEC is a technology framework for the reduction of NOx emissions to the level required by US Tier 2/Bin 5 / California LEV II emissions requirements—the world’s most stringent. The current Tier 2 Bin 5 solution under development is a urea-SCR system that relies on the use of AdBlue—an aqueous urea solution.
Injection of the AdBlue urea solution into the pre-cleaned exhaust gas releases ammonia (NH3), causing the nitrogen oxides to be converted into nitrogen (and water) in a downstream catalytic converter.
“We may not permit that this critical technology [i.e., diesel] for the US is bad-mouthed,” explains a insider. “The German automakers with their competence in diesel must go there together,” says an AUDI manager—also because of Japanese success with hybrids [there].