Diesel-powered vehicles entering the U.S. have to meet stringent emission standards set by new legislation put into effect this year. Because of this hurdle, many manufacturers are looking towards using additives, like the urea-based injection system developed by DaimlerChrysler, to meet these standards.
Honda, on the other hand, is engineering a system that produces ammonia within the catalytic converter, changing harmful nitrogen oxide into just plain old nitrogen. The system is in the process of being tuned to accept a variety of diesel fuel, while still maintaining its low emissions, through chemical testing and programming through the federally mandated On Board Diagnostic System (OBD).
Honda plans on bringing the new diesel to the U.S. market within three years, soon after Volkswagen releases their own line of revamped diesels to consumers in 2008.