19 March 2010
Navistar announced that it has received certification from the US Environmental Protection Agency (EPA) for its 2010 MaxxForce® DT Advanced EGR (exhaust gas recirculation) mid-range diesel engine. Navistar said it anticipates receiving EPA certifications for their other engine families in the “days and weeks ahead”.
The MaxxForce DT I-6 engine powers such vehicle as the medium-duty International® DuraStar® and severe service International® WorkStar®, as well as several models of IC Bus™ brand school buses.
Navistar is the only manufacturer who chose in-cylinder NOx control technology, which the company calls “Advanced EGR”, for their US 2010 diesel engines. While the certification levels of the DT engine are not yet publicly available, Navistar announced earlier that it planned to certify their Advanced EGR engines at around 0.5 g/bhp-hr NOx and cover the difference from the 2010 standard of 0.2 g/bhp-hr NOx by emission credits.
Other manufacturers, including Volvo, Cummins and Daimler, chose urea-SCR technology—a solution that could provide superior fuel economy—for NOx control from their US 2010 engines. Navistar, while opposing SCR technology based on liquid urea solution, is studying solid SCR technologies for potential use in their post-2010 diesel engines.