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HEAVY-DUTY GREENHOUSE GAS EMISSIONS MODEL (GEM)
HEAVY-DUTY GREENHOUSE GAS EMISSIONS MODEL (GEM).
Evaluation of both fuel consumption and CO2 emissions from heavy-duty highway vehicles through a whole-vehicle operation simulation model.
Class 2b-8 vocational truck manufacturers and Class 7/8 tractor manufacturers would be subject to vehicle-based fuel economy and emission standards that would use a truck simulation model to evaluate the impact of the truck tires and/or tractor cab design on vehicle compliance with any new standards. The EPA has created a model called “GHG Emissions Model (GEM)”, which is specifically tailored to predict truck GHG emissions. As the model is designed for the express purpose of vehicle compliance demonstration, it is less configurable than similar commercial products and its only outputs are GHG emissions and fuel consumption. This approach gives a simple and compact tool for vehicle compliance without the overhead and costs of a more sophisticated model.
URLs/Downloads:Greenhouse Gas Emissions Model (GEM) for Medium- and Heavy-Duty
PEER REVIEW OF THE GREENHOUSE GAS EMISSIONS MODEL (GEM) AND EPA'S RESPONSE TO COMMENTS (PDF,106 pp, 1754 KB, about PDF)