Truck & Components
- Published: Sunday, 12 May 2013 13:22
- Written by CP Staff
EcoFit Dosing Unit
EcoFit Supply Unit
The company reports that its 2013 ISX12 and ISL 9 on-highway diesel engines offer up to 2 percent better fuel economy compared with the 2012 model-year engines.
Changes to gearing recommendations and maintenance intervals increase the 2013 engines' fuel economy and lower operating costs. Fuel economy is improved through the use of downspeeding, which allows the ISX12 to achieve peak torque at 100 fewer rpm, and the approved use of low-viscosity 10W30 oils. Maintenance expenses are reduced through increased oil drain intervals.
At this year's Mid-America Trucking Show, Cummins announced a forthcoming addition to the ISL and ISX12 exhaust treatment systems from subsidiary Cummins Emissions Solutions: the EcoFit UL2 Liquid-Only Urea Dosing System, which improves atomization of urea (diesel exhaust fluid). The system's freeze-robust components allow for optimal pump-priming and the prevention of crystallization throughout.
With separate supply and dosing units, the EcoFit UL2 has been specifically designed and tested for leading emissions markets. The spray nozzle allows customization in flow rates and spray cone angles; an intelligent doser, with temperature and pressure sensors at the point of injection, allows for flexible vehicle integration by accommodating varying dosing line lengths without affecting controls. The dosing nozzle provides improved oxides of nitrogen (NOx) conversion efficiency rates through urea droplet sizes comparable to those of air-assisted systems—reducing the likelihood of droplets in the exhaust system's Decomposition Reactor. Due to freeze robustness, urea can remain in the EcoFit UL2 at all times.
Alongside the diesel power line up is an expanding Cummins Westport natural gas engine portfolio, highlighted with the ISX12 G, entering full production this spring. The larger ISX12 G joins the ISL (8.9) G, whose applications include compressed natural gas-powered mixers (see Freightliner, page 36; Oshkosh, page 37). Both models utilize Cummins Westport's proprietary spark-ignited combustion technology featuring Stoichiometric cooled Exhaust Gas Recirculation and maintenance-free Three-Way Catalyst. — 800/343-7357; www.cummins.com, www.cumminsengines.com
With emissions done, fuel economy next up
Shifting focus from emissions-driven innovations toward those prioritizing fuel economy, Cummins Turbo Technologies cites a tipping point at which global engine and vehicle manufacturers are developing products to insulate customers from rising diesel prices. Their aim of maintaining or increasing power outputs from smaller, lighter products has spawned a number of significant engineering challenges, Cummins contends.
Among next-generation technologies geared to the fuel economy-driven downsizing of components is Cummins Turbo Technologies' Waste Heat Turbine Expander. Displayed as a prototype at the 2013 Mid-America Trucking Show, the device captures what would otherwise be lost energy in the form of heat from onboard vehicle sources, turning it into useful mechanical 34 hp power capable of reducing vehicle fuel consumption by 5 percent.