0

Full Content is available to subscribers

Subscribe/Learn More  >

Development of an Interface Method for Implementing Road Grade in Chassis Dynamometer Testing

[+] Author Affiliations
Gregory J. Thompson, Nigel N. Clark, Richard J. Atkinson, Zac Luzader, Frances L. VanScoy, Vic Baker, Jesse Chandler

West Virginia University, Morgantown, WV

Paper No. ICEF2004-0896, pp. 53-60; 8 pages
doi:10.1115/ICEF2004-0896
From:
  • ASME 2004 Internal Combustion Engine Division Fall Technical Conference
  • ASME 2004 Internal Combustion Engine Division Fall Technical Conference
  • Long Beach, California, USA, October 24–27, 2004
  • Conference Sponsors: Internal Combustion Engine Division
  • ISBN: 0-7918-3746-7 | eISBN: 0-7918-3748-3
  • Copyright © 2004 by ASME

abstract

Mobile source emissions inventory data from heavy-duty on-road vehicles are traditionally obtained using three methods: engine dynamometer, chassis dynamometer, or in-use vehicle driving. Engine dynamometer testing provides for the greatest control and highest accuracy but requires the most time and can be cost prohibitive when obtaining emissions from many in-use engines. In-use emissions collection is a relatively inexpensive and rapid method of obtaining real-world data, but this method is relatively new and is not regulated by any Federal or international regulations as of yet and accuracy of the data from these devices has not been established. Chassis dynamometer-based testing provides for the means of obtaining a large sample of data from in-use vehicles in a controlled environment. However, existing chassis dynamometer cycles assume a level road surface with no grade. In a chassis dynamometer test cycle, a simple line trace is used to represent the desired vehicle speed on a video monitor for the driver to follow. A second line trace is overlaid on the first to indicate the actual vehicle speed on the dynamometer and the drive adjusts the vehicle speed to match the scheduled speed as closely as he is able. Experienced chassis dynamometer test drivers are able to look at the desired speed and anticipate the required gearshifts during the testing. However, to account for road grade in a chassis dynamometer test schedule, the driver of the vehicle will require additional cues. Also, drivers may not drive a vehicle while following a trace in the same way that they drive on the road. To implement grade and inject a sense of the real world in a chassis dynamometer test cycle, a virtual reality interface has been developed to employ images of a roadway with feedback between the driver’s performance and the image. As a first step to implementing grade, a level road surface using a virtual reality interface was emulated using an in-house developed software package to present images of roadways, including traffic control signals and constraints due to traffic congestion. In the virtual reality execution, the driver perceives the position of the vehicle relative to traffic signals and other traffic cues. An initial investigation into the effect of road grade using the conventional line trace method is shown and then use of the virtual reality approach is compared with the conventional line trace. The results from the study shows that an experienced driver can use the virtual reality interface with similar emission results as the conventional line trace method.

Copyright © 2004 by ASME
Topics: Dynamometers , Testing , Roads

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In