Environmental Potential of Natural Gas Fuel for Light-Duty Vehicles: An Engine-Dynamometer Study of Exhaust-Emission-Control Strategies and Fuel Consumption 932744
In a study to determine the potential environmental effects of a compressed-natural-gas-fueled (CNG) passenger car, engine-dynamometer tests were conducted with a 2.8-L engine fueled with a pre-mixed charge of either methane (CH4) or actual CNG. At the base compression ratio (CR) of 8.9:1, stoichiometric versus lean emission control strategies were explored. CR was then raised to 11.5:1 and 14:1. Estimates of tailpipe exhaust emissions and fuel consumption on the US urban and highway driving cycles were made based on steady-state engine-dynamometer test results. Speciation of the exhaust emissions provided indication of the potential to meet future exhaust emission standards. Unregulated emissions including toxics and greenhouse gases were examined as well as the potential to form ground-level ozone (O3).
Citation: Siewert, R., Mitchell, P., and Mulawa, P., "Environmental Potential of Natural Gas Fuel for Light-Duty Vehicles: An Engine-Dynamometer Study of Exhaust-Emission-Control Strategies and Fuel Consumption," SAE Technical Paper 932744, 1993, https://doi.org/10.4271/932744. Download Citation
Robert M. Siewert, Patricia J. Mitchell, Patricia A. Mulawa
GM NAO Research and Development Center
International Fuels & Lubricants Meeting & Exposition
Advanced Alternative Fuels Technology-SP-0995, SAE 1993 Transactions: Journal of Fuels & Lubricants-V102-4