United States Department of Transportation
i
Use driving simulator to synthesize the related vehicle specific power (VSP) for emissions and fuel consumption estimations.
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2016-01-01
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[PDF-2.14 MB]
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Abstract:Driving simulator approach can readily incorporate drivers’ real driving behaviors, the essential parameter that influences emissions. With regard to this, this research is proposed to test and validate the feasibility and applicability of the driving simulator approach in producing vehicle activity data, thus generating vehicle specific power (VSP) values for estimating the emissions. A test scenario was developed for the driving simulator based on real world network parameters. Twenty drivers participated in the driving simulator tests. Each participant drove both a vehicle in the real world network and the driving simulator in the lab environment to ensure consistent driving behaviors. The test results demonstrated that the difference between operating mode distributions from real world driving versus driving simulators no more than 5%. The operating mode distributions in the two tests were highly correlated to each other (R 0.95) and posed statistically significant indistinctive. The average relative difference in total emissions was only around 2% to 3%. Based on the analysis results as well as the feedback survey from the 20 participating drivers, the study concludes that the driving simulator is a feasible experimental tool for developing VSPs, and thus for estimating vehicle emissions, especially for scenarios where the driving time is relatively short, and network and traffic conditions are less complex. Besides, a fuzzy logic based Table Look-Up Scheme was designed to calibrate the operating mode distributions from the simulator. Results show that the calibration errors of estimated emissions can be reduced to about 50% of the total emission, while the validation error of overall emissions is less than 2%. The approach was tested in two cases, which demonstrates that it is applicable to estimate vehicle emissions using the driving simulator tests.
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