Cummins will meet the more stringent 2010 EPA emissions standard for on-highway engines without NOx aftertreatment for its heavy-duty engines, and using SCR technology for midrange.

In an announcement at the fall meeting of the Technology and Maintenance Council of the American Trucking Associations, Cummins said the new engines will have the same fuel economy and maintenance intervals as today.
For heavy-duty engines, NOx reduction will be achieved using the XPI High Pressure Common Rail (HPCR) fuel system, next-generation cooled Exhaust Gas Recirculation (EGR), advanced electronic controls, proven air handling and the Cummins Particulate Filter.
Cummins will expand the Heavy-Duty X platform in North America to three displacements with the introduction of an 11.9-liter engine and a 16-liter engine to complement its flagship 15-liter product. The engines will share a common architecture including the XPI HPCR fuel system. This marks the first time in nearly 20 years that the company has had a common architecture across its heavy-duty products.
Cummins will continue to use its Variable Geometry Turbocharger, which bolsters total engine performance from power output to response to superior engine braking, while working in tandem with the cooled-EGR subsystem.
For its mid-range on-highway engines, Cummins will add Selective Catalytic Reduction (SCR) to its existing product to meet the 2010 emissions standards. SCR technology uses a chemical called urea and a catalytic converter to significantly reduce oxides of nitrogen (NOx) emissions.
SCR technology is already used in Europe. In 2006, Cummins launched its mid-range engines certified to the Euro 4 standard using SCR for commercial vehicle applications in Europe.
All Cummins on-highway engines will be fully certified and compliant to the near-zero EPA 2010 emissions standards.