Heavy Duty Trucking

DEC 2014

The Fleet Business Authority

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25% ENGINE EFFICIENCY 5% PARASITIC REDUCTIONS 10% WEIGHT REDUCTION 30% AERO IMPROVEMENT FuelSmarts 32 HDT • DECEMBER 2014 www.truckinginfo.com in a gallon of diesel actually goes to powering the truck. Most of it is lost to heat, internal friction, parasitic loss and other things. Navistar's take At the recent Green Fleet Confer- ence in Schaumburg, Ill., Navistar's Darren Gosbee, engineering director, advanced technology and powertrain calibration, shared some insights from what Navistar has learned on its project. Each truck maker is going about meeting the SuperTruck goals in slightly different ways. Gosbee said Navistar believes it will achieve a 70% improvement, made up of about 30% aerodynamic improve- ments, 25% engine efficiency im- provements, 10% weight reduction and 5% reduction in parasitic loads. For instance, Gosbee said, aero improvements for the project are largely about matching the tractor and trailer together. "It's really about the trailing body aerodynamics, the leading body aerodynamics, and how you manage the gap." You have to get the trailing body dynamics right before you turn your attention to the leading body, he said, and maximize how the airflow passes down the trailer. With the help of trailer partner Wabash, the Navistar SuperTruck project has been looking at rear, nose, under- body and side skirt options. "We've been doing aerodynamic work in wind tunnels for the last nine months, intently focusing on the tractor-trailer combination and what we can actually do. It's one-eighth A harder task is the goal to increase engine efficiency by 20%, achieving 50% brake thermal ef- ficiency, or BTE, compared to a 42% baseline. In baseline EPA-2010 models, about 42% of the energy Deborah Lockridge • Editor in Chief E arlier this year, Peterbilt and Cummins made headlines when they announced they had achieved 10.7 mpg with their SuperTruck tractor-trailer under real-world driving conditions. But there are still several other teams working on SuperTruck proj- ects. The Department of Energy's SuperTruck program provided $284 million in matching funds to four manufacturer teams to develop a research project improving the freight-hauling efficiency of heavy- duty, long-haul tractor-trailers. The goal is to provide a 50% increase in overall tractor-trailer freight efficiency compared to a 2010 baseline. EPA's engine targets prove more challenging than expected Navistar outlines SuperTruck progress "We've been doing aerodynamic work in wind tunnels for the last nine months, intently focusing on the tractor-trailer combination." — Darren Gosbee, Navistar SuperTruck goals call for a 50% increase in overall freight effi- ciency. Navistar be- lieves it will show a 70% improve- ment broken out as shown at left, with aerodynamic improvements leading the way. Projected Freight Fuel Efficiency

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