28 July 2001

US EPA Deputy Administrator Linda Fisher recognized the recent certification of International Truck and Engine Corporation (Navistar) for its Green Diesel Technology™ to be used in school buses in California. With this certification Navistar has demonstrated that it is possible to meet the heavy-duty diesel particulate matter (PM) emission standards well in advance of the 2007 model year requirements.

At an EPA Headquarters ceremony in Washington, DC, Fisher said, “We appreciate International’s commitment to bringing cleaner engine technology well ahead of schedule. This shows that these new standards are not only possible but achievable. This is an important and timely step in reducing greenhouse gas emissions and soot from the tailpipe. We are well on our way to provide cleaner air for all Americans.”

EPA Administrator Christie Whitman announced on February 28 that the Agency would move forward on schedule with it’s 2007 emission standards and fuel rule. The rule’s requirements go into effect in 2006 for low-sulfur diesel and model year 2007 for cleaner engines.

School buses with the new technology are being used in the San Diego, CA, Unified School District. International received the emission certification for its “Green Diesel Technology” engine in March. The engine was a Navistar 530 cu.in., 275 hp unit fitted with a catalyzed diesel particulate filter (DPF) from Engelhard. It was emission certified by both the EPA and the California Air Resources Board.

The engine is certified at a PM level of 0.01 g/bhp-hr (US2007). NOx emissions were measured at 3.0 g/bhp-hr. For comparison, current HD engines have to meet a 4.0 g/bhp-hr NOx standard and a PM standard of either 0.1 g/bhp-hr (trucks) or 0.05 g/bhp-hr (urban buses). The DPF-fitted engine is to be operated on a 15 ppm ultra low sulfur diesel fuel.

This was the first emission certification worldwide of a new heavy-duty diesel engine equipped with a DPF. It will be watched by the industry as an important experience towards meeting the US2007 emission standards, when all HD engines are expected to require particulate filters.

Source: EPA