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Fuel Management and Exhaust Emissions of Light- and Heavy-Duty Trucks Operating on CNG and LPG
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Abstract
A group of GM C-2500 heavy-duty and GM C-1500 light-duty trucks were modified to bi-fuel compressed natural gas (CNG)/gasoline and liquefied petroleum gas (LPG)/gasoline vehicles. The fuel management systems used for different model year vehicles were introduced. The Alternative Fuel Technology (AFT) System used for 1997 GM C-2500 trucks is discussed in detail. AFT is an automatic switching bi-fuel system which is able to control fuel flow rate, spark timing, and EGR, and perform On-Board Diagnostics (OBD-II). The exhaust emissions of carbon monoxide (CO), total hydrocarbon (HC) and oxides of nitrogen (NOx) were measured using dilute sampling techniques. The vehicles tested were operated on a chassis dynamometer and run on the Federal Test Procedure (FTP) Urban Schedule.
It was found that compared to those from baseline gasoline vehicles, the NOx emissions from both CNG and LPG vehicles were significantly reduced, and that the HC and CO emissions from LPG vehicles were significantly reduced. However, the total HC emissions from CNG vehicles were substantially higher than those from the baseline gasoline vehicles. The CO emissions of the CNG vehicles showed different trends between different model year vehicles using different fuel management systems. For the 1997 C-2500 trucks using the AFT system, the CO emissions were lower than the baseline gasoline vehicles. The fuel economy on a gasoline equivalent energy basis of CNG and LPG vehicles were about 22% and 4% lower respectively, than that of the baseline gasoline vehicles.
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Sun, X., Wiedmann, T., and Hussain, S., "Fuel Management and Exhaust Emissions of Light- and Heavy-Duty Trucks Operating on CNG and LPG," SAE Technical Paper 971661, 1997, https://doi.org/10.4271/971661.Also In
References
- Wang, W. Gautam, M. Sun, X. Bata, R. Clark, N. Lyons, D. “Emissions Comparisons of Heavy Duty Vehicles Operated on Four Types of Fuels,” SAE Paper 932952 , SAE Transactions 1993
- Bruetsch, R. “Emissions, Fuel Economy, and Performance of Light-Duty CNG and Dual-Fuel Vehicles,” U. S. EPA Ann Arbor, MI 1988
- Wang, W. Sun, X. Bata, R. Gautam, M. Clark, N. Palmer, G. Lyons, D. “A Study of Emissions from CNG and Diesel Fueled Heavy Duty Vehicles,” SAE Paper 932826 1993
- Varde, K. Cherng, J. Bailey, C. Majewski, W. “Emissions and Their Control in Natural Gas Fueled Engines,” SAE Paper 922250 1992
- Ryan, T. Lestz, S. “The Laminar Burning Velocity of Isooctane, N-Heptane, Methanol, Methane, and Propane at Elevated Temperature and Pressures in the Presence of a Diluent,” SAE Paper 800103 1983
- Heck, R. Farrauto, R. Catalytic Air Pollution Control International Thomson Publishing Inc. 1995
- Cheng, W. Hamrin, D. Heywood, J. Hochgreb, S. Min, K. Norris, M. “An Overview of Hydrocarbon Emissions Mechanisms in Spark-Ignition Engines,” SAE Paper 932708 1993
- Sun, X. Assanis, D. Brereton, G. “Numerical Modeling and Experimental Validation of Steady-State Hydrocarbon Emissions from Small Utility Four-Stroke Engines,” ASME Paper, ICE-96 26-1 1996
- Heywood, J. B. Internal Combustion Fundamentals McGraw-Hill 1988
- Hofeldt, D. “Alternative Fuel Technologies for Heavy-Duty Vehicles: Performance, Emissions, Economics, Safety, and Development Status,” SAE Paper 930731 1993
- The Clean Fuel Report 5 2 J. E. Sinor Consultant Inc Niwot, Colorado April 1993
- Sun., X. Wiedmann, T. Hussain, S. Agarwal, A. Assanis, D. “Model Prediction and Experimental Validation of the Performance, Fuel Economy, and Exhaust Emissions of SI Engines Running on Gasoline and Alternative Fuels,” SAE Paper 1997 SAE International Fuels & Lubricants Meeting & Exposition Tulsa, OK October 13-16 1997