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Gasoline fuels growing number of commercial vehicles

SAE Truck & Off-Highway Engineering: April 2019

Ryan Gehm
  • Magazine Article
  • 19TOFHP04_09
Published 2019-04-01 by SAE International in United States

Biodiesel may be the top alternative fuel for work truck fleets, according to the 2019 Fleet Purchasing Outlook Survey conducted by the National Truck Equipment Association (NTEA), but another “alt fuel” is gaining momentum in certain commercial vehicle (CV) segments: good old gasoline.

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Quotes from COMVEC 2018

SAE Truck & Off-Highway Engineering: October 2018

  • Magazine Article
  • 18TOFHP10_09
Published 2018-10-01 by SAE International in United States

Industry leaders spoke extensively about all things autonomous-ADAS, big data, connectivity, cybersecurity, machine learning-at the annual SAE event. Here's some of what they had to say.

Troy Clarke, Chairman, President & CEO, Navistar

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AUGMENTED REALITY: Beyond Gaming to Real-World Solutions

  • Magazine Article
  • TBMG-27667
Published 2017-10-01 by Tech Briefs Media Group in United States

Ask a stranger off the street what Virtual Reality (VR) is or how it works, and most people will have some inclination of what the technology entails; however, ask that same person about Augmented Reality (AR), and the answers are less likely to be easily gained. Maybe someone will talk about the gaming aspect of the technology, or its earliest incarnation in the failed Google Glass.


Wind Tunnel Evaluation of Potential Aerodynamic Drag Reductions from Trailer Aerodynamic Component Combinations

Auto Research Center LLC-Angus Lock
U.S. Environmental Protection Agency-Sam Waltzer, Julie Hawkins, Arvon Mitcham, Dennis W. Johnson
Published 2015-09-29 by SAE International in United States
The use of devices to reduce aerodynamic drag on large trailers and save fuel in long-haul, over-the-road freight operations has spurred innovation and prompted some trucking fleets to use them in combinations to achieve even greater gains in fuel-efficiency. This paper examines aerodynamic performance and potential drag reduction benefits of using trailer aerodynamic components in combinations based upon wind tunnel test data.Representations of SmartWay-verified trailer aerodynamic components were tested on a one-eighth scale model of a class 8 sleeper tractor and a fifty three foot, van trailer model. The open-jet wind tunnel employed a rolling floor to reduce floor boundary layer interference. The drag impacts of aerodynamic packages are evaluated for both van and refrigerated trailers. Additionally, the interactions between individual aerodynamic devices is investigated. Results indicate that combinations of devices can provide trailer aerodynamic drag reductions of up to twenty one percent in wind-averaged conditions. Van and refrigerated trailer configurations show relatively similar aerodynamic performance with refrigerated trailers seeing greater drag reductions in certain cross-wind conditions. The combinations investigated in this study indicate that…
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Fuel Efficiency Improvements in Heavy Truck Wheel Systems through Advanced Bearing Design and Technology

SAE International Journal of Commercial Vehicles

The Timken Company-Matt Zwick
  • Journal Article
  • 2014-01-2330
Published 2014-09-30 by SAE International in United States
The base design of commercial vehicle wheel end systems has changed very little over the past 50 years. Current bearings for R-drive and trailer wheel end systems were designed between the 1920's and the 1960's and designs have essentially remained the same. Over the same period of time, considerable gains have been made in bearing design, manufacturing capabilities and materials science. These gains allow for the opportunity to significantly increase bearing load capacity and improve efficiency.Government emissions regulations and the need for fuel efficiency improvements in truck fleets are driving the opportunity for redesigned wheel end systems. The EPA and NHTSA standard requires up to 23% reduction in emissions and fuel consumption by 2017 relative to the 2010 baseline for heavy-duty tractor combinations.This paper summarizes the history of current wheel end bearing designs and the opportunity for change to lighter-weight, cooler-running and more fuel-efficient wheel bearing designs to help meet the new industry standards. Advanced design and modeling principles were applied to analyze improvements, leading to optimized designs. Physical testing validated that these new bearing…
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Analysis of Video Event Recorder Data Used for Accident Reconstruction

Veritech Consulting Engineering LLC-Jeffrey K. Ball, Mark Kittel, Trevor Buss
Waste Management, Inc.-Greg Weiss
Published 2014-09-30 by SAE International in United States
Trucking fleets are increasingly installing video event recorders in their vehicles. The video event recorder system is usually mounted near the vehicle's rear view mirror, and consists of two cameras: one looking forward and one looking towards the driver. The system also contains accelerometers that record lateral and longitudinal g-loading, and some may record vehicle speed (in mph) based on GPS positions. The unit constantly monitors vehicle acceleration and speed, and also records video. However, the recorded data is only stored when a preset acceleration threshold is met. The primary use of the system is to assist fleets with driver training and education, but the recorded data is also being used as a tool to reconstruct accidents. By integrating the accelerometer data, the vehicle speed and distance traveled during the event can be calculated. However, the calculated speeds and distances from video event recorder data may differ from reconstructions based on data taken from engine control modules (ECM's) or classic reconstruction techniques. The objective of this study was to determine the source(s) of these differences…
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The Use of Available Qualcomm Data in Accident Reconstruction and Analysis

Hrycay Consulting Engineers Inc.-Roger Bortolin, Matthew Arbour, James Hrycay
Published 2014-04-01 by SAE International in United States
Whether large or small, a truck fleet operator has to know the locations of its vehicles in order to best manage its business. On a day to day basis loads need to be delivered or picked up from customers, and other activities such as vehicle maintenance or repairs have to be routinely accommodated. Some fleets use aftermarket electronic systems for keeping track of vehicle locations, driver hours of service and for wirelessly text messaging drivers via cellular or satellite networks. Such aftermarket systems include GPS (Global Positioning System) technology, which in part uses a network of satellites in orbit. This makes it possible for the fleet manager to remotely view the location of a vehicle and view a map of its past route. These systems can obtain data directly from vehicle sensors or from the vehicle network, and therefore report other information such as fuel economy. The fleet manager can receive alerts when high-level brake applications occur, which could be an indication of tailgating or aggressive driving behavior. Undesirable equipment issues or driver performance concerns…
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Comparison of Particulate Matter Emissions from Different Aftertreatment Technologies in a Wind Tunnel

West Virginia Univ.-Daniele Littera, Alessandro Cozzolini, Marc Besch, Mario Velardi, Daniel Carder, Mridul Gautam
Published 2013-09-08 by SAE International in United States
Stringent emission regulations have forced drastic technological improvements in diesel after treatment systems, particularly in reducing Particulate Matter (PM) emissions. Those improvements generally regard the use of Diesel Oxidation Catalyst (DOC), Diesel Particulate Filter (DPF) and lately also the use of Selective Catalyst Reduction (SCR) systems along with improved engine control strategies for reduction of NOx emissions from these engines. Studies that have led to these technological advancements were made in controlled laboratory environment and are not representative of real world emissions from these engines or vehicles. In addition, formation and evolution of PM from these engines are extremely sensitive to overall changes in the dilution process. In light of this, the study of the exhaust plume of a heavy duty diesel vehicle operated inside a subsonic environmental wind tunnel can give us an idea of the dilution process and the representative emissions of the real world scenario.The subsonic environmental wind tunnel used for this study is capable of accommodating a full-sized heavy-duty truck and generating wind speeds in excess of 50mph. It was specifically…
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Retrofits Convert Gas Vehicles into Hybrids

  • Magazine Article
  • TBMG-15811
Published 2013-02-01 by Tech Briefs Media Group in United States

One initiative at Glenn Research Center, the Hybrid Power Management (HPM) program, focused on joining new and mature technologies for optimal power systems applications in space and on Earth, with the goal not only to develop ultra-efficient space power systems, but also to advance HPM to address global energy issues.


Application of a Tractive Energy Analysis to Quantify the Benefits of Advanced Efficiency Technologies for Medium- and Heavy-Duty Trucks Using Characteristic Drive Cycle Data

SAE International Journal of Commercial Vehicles

Oak Ridge National Laboratory-Tim J. LaClair
  • Journal Article
  • 2012-01-0361
Published 2012-04-16 by SAE International in United States
Accurately predicting the fuel savings that can be achieved with the implementation of various technologies developed for fuel efficiency can be very challenging, particularly when considering combinations of technologies. Differences in the usage of highway vehicles can strongly influence the benefits realized with any given technology, which makes generalizations about fuel savings inappropriate for different vehicle applications. A model has been developed to estimate the potential for reducing fuel consumption when advanced efficiency technologies, or combinations of these technologies, are employed on highway vehicles, particularly medium- and heavy-duty trucks. The approach is based on a tractive energy analysis applied to drive cycles representative of the vehicle usage, and the analysis specifically accounts for individual energy loss factors that characterize the technologies of interest. This tractive energy evaluation is demonstrated by analyzing measured drive cycles from a long-haul trucking fleet and the results of an assessment of the fuel savings potential for combinations of technologies are presented. The results of this research will enable more reliable estimates of the fuel savings benefits that can be realized…
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