||Peer review of the greenhouse gas emissions model (GEM) and EPA's response to comments : phase II /
||Versar, Inc., Columbia, MD.; Environmental Protection Agency, Washington, DC. Office of Transportation and Air Quality.
|| U.S. Environmental Protection Agency,
Greenhouse gases--United States--Forecasting--Computer programs.
Peer review ;
Greenhouse Gas Emissions Model (GEM) ;
Safety Hazards ;
Greenhouse gas emissions reduction ;
fuel economy ;
Powertrain technologies ;
Fuel efficiency ;
Emissions regulations ;
United States Environmental Protection Agency (EPA) ;
Chevrolet Silverado Crew Cab ;
National Crash Analysis Center (NCAC) ;
Phase 2 report
||PDF file on file
||NVFEL Library/Ann Arbor, MI
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||1 online resource ( pages) : tables, figures
EPA, the National Highway Traffic Safety Administration (NHTSA), and the California Air Resources Board (CARB), in looking to reduce greenhouse gas emissions (GHG) and to improve fuel efficiency in medium-(MD) and heavy-duty (HD) vehicles, are considering recognizing the efficiency of various power-train technologies within the context of any new full vehicle emission standard(s). For this option, it becomes critical to develop methods that assess the expected real world performance of those technologies, including vehicle engine, transmission and axle technologies. Enhancements have also been made to their HD vehicle simulation software tool, GEM (Greenhouse Gas Emission Model). At present, GEM is used by vehicle manufacturers to certify the expected GHG emissions of their products. With the enhancements, GEM could potentially have the ability to model a majority of the advanced technologies being incorporated into these vehicles and their engines and that are being recognized by engine and chassis dynamo-ometer emission testing today. EPA and the other agencies consider the GEM tool as a principal support for the second round of HD GHG emissions regulations which are under development at the present time in both NHTSA and EPA. The model has undergone a formal peer review in an earlier iteration of the GEM tool (Phase I) and this newest version of GEM (Phase II) is the subject of this peer review. EPA is looking to assure the regulated community of the high quality of the agenciesÃ¢â‚¬â„¢ predictive tool and that the proposed structure (and overall development process) of the GEM model results in a tool that is simple, accurate and well-suited for the diversity of vehicles to which it may be applied. The purpose of the requested peer review is for EPA to receive written comments from experts on the concepts and methodologies upon which GEM relies and whether or not the model can be expected to execute these algorithms correctly.
Title from PDF title screen (viewed May 3, 2016). "EPA-420-R-15-009." "June 2015." "EPA contract no. EP-C-12-045, work assignment no. 44." Supersedes EPA 420-R-11-007.