24 September 2007
Cummins announced its technology approach for on-highway engines to meet the 2010 EPA emission standards. Cummins heavy-duty 2010 engines will use no NOx aftertreatment, while urea-SCR will be used on medium-duty engines. The 2010 engines will have a comparable fuel economy and the same maintenance intervals as 2007 engines.
Heavy-Duty Engines. Emission reductions in Cummins 2010 heavy-duty engines will be achieved with no NOx aftertreatment, using such technologies as “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”.
The next-generation cooled EGR will not add complexity to the vehicle; and power, torque, fuel economy and maintenance intervals will stay the same, said Cummins. The 2010 engines will continue to use the variable geometry turbocharger (VGT) working in tandem with the cooled-EGR subsystem.
The Cummins particulate filter, designed and manufactured by Cummins Emission Solutions and introduced in 2007, will be the only aftertreatment required for heavy-duty engines in 2010.
Cummins also announced an expansion of its Heavy-Duty X platform in North America to three displacements with the introduction of an 11.9 L engine and a 16 L engine to complement its existing 15 L product. The engines will share a common architecture including the XPI HPCR fuel system. The expansion will enable Cummins to meet a broader array of customer needs, providing a common architecture across the heavy-duty engine industry.
MidRange Engines. Cummins will add selective catalytic reduction (SCR) to its existing MidRange product to meet the 2010 emission standards. SCR technology uses urea and a catalytic converter to reduce NOx emissions.
Cummins has been using urea-SCR technology in its European market Euro IV engines since 2006.
Cummins has launched several diesel engine models that exceeded their minimum emission requirements, for example the 6.7 liter turbodiesel for the 2007 Dodge Ram 2500 and 3500 heavy pickup trucks. Under the EPA emission regulations, manufacturers of engines that exceed emission standards accumulate emission credits, which can be used to offset emissions from other engine models.