15 March 2004

Detroit Diesel Corporation (DDC) said it will use exhaust gas recirculation (EGR) and diesel particulate filters on its heavy-duty engines to meet the EPA’s 2007 emission standards. EGR will be used on the DDC Series 60 and the Mercedes-Benz engines marketed by the company. A new heavy-duty engine being developed by DDC and parent company DaimlerChrysler, scheduled for release in 2007, will also employ EGR and diesel particulate filters for North American applications.

DDC said 2007 EGR engines are already in development, and the company intends to operate vehicles with the 2007 engines by the end of this year.

The 2007 EPA standards require about 50% reduction in NOx emissions and a 90% reduction in particulate matter relative to the 2004 limits. All manufacturers, including DDC, will use diesel particulate filters to meet the new PM standard. The 2007 NOx requirements will be met using either cooled EGR or, in the case of Caterpillar, its ACERT technology. Most US manufacturers announced their technology plans last December. At that time, DDC was still considering urea-SCR technology to reduce NOx from some of its engines. DDC finally chose EGR over SCR because of customers’ greater familiarity with the system and its ease of deployment. Urea-SCR remains a viable alternative for 2010, said DDC.

DDC introduced EGR in certain urban bus engines in 2000, and applied the technology to all its engines since October 2002. The company has built over 40,000 Series 60 engines with EGR, and the 2004 Mercedes-Benz engines are also equipped with EGR. These engines have accumulated an estimated 2.5 billion miles of service since October 2002. By 2007, there will be approximately 300,000 Detroit Diesel and Mercedes-Benz engines operating in North America utilizing EGR technology.

Source: Detroit Diesel Corporation