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EFFECT OF LOAD SIMULATION ON AUTO EMISSIONS AND MODEL PERFORMANCE
Citation:
Gabele, P. AND R. Snow. EFFECT OF LOAD SIMULATION ON AUTO EMISSIONS AND MODEL PERFORMANCE. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/3-83/104 (NTIS PB84120369), 1983.
Description:
The overall objective of this study was to identify sources which might contribute to errors in mobile source emission rate model predictions. The effect of road load simulation on exhaust emissions was examined and an evaluation of the U.S. Environmental Protection Agency's Automobile Exhaust Emission Modal Model was conducted. The Modal Model is a component of the Intersection Midblock Model and MOBILE2, two widely used programs for predicting emissions from mobile sources. Results from tests on a Chevrolet Celebrity (3000 pounds gross vehicle weight) indicated that emissions during tests with water brake load simulation did not differ significantly from those during tests with actual road load simulation. Evaluation of the Modal Model was completed by comparing actual emissions data with predicted values. The Celebrity was used to generate emissions data for the New York City Cycle, the Surveillance Driving Schedule, and the Federal Test Procedure. Results indicated that the Modal Model was unable to accurately predict emission rates for the Celebrity.