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Improving the Measurement of Chassis Dynamometer Fuel Economy
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English
Abstract
Obtaining vehicle fuel economy data in conjunction with chassis dynamometer emissions testing is a useful, convenient technique. Data derived in this manner, using EPA city and highway driving cycles, are in wide use. Fuel economy results obtained by carbon mass balance calculation of carbon containing compounds in the vehicle exhaust are at least as accurate and repeatable as those obtained by direct measurement of fuel consumed. Nevertheless, the overall chassis dynamometer-carbon balance fuel economy test yields undesirable variation of results and needs refinement. Major factors influencing the accuracy and repeatability of test results are: CO2 measurement accuracy; variations in following the driving cycle; vehicle-dynamometer interface conditions; and associated calibration, calculation, test technique and procedural methods and controls employed. Each of these factors is discussed in terms of its relative importance and causal factors, along with suggested or potential means for improvement.
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Authors
Citation
Simpson, B., "Improving the Measurement of Chassis Dynamometer Fuel Economy," SAE Technical Paper 750002, 1975, https://doi.org/10.4271/750002.Also In
References
- Austin, T. C. Hellman, K. H. “Passenger Car Fuel Economy - Trends and Influencing Factors,” SAE Paper No. 730790 September 1973
- Federal Register “Control of Air Pollution from New Motor Vehicles and New Motor Vehicle Engines,” 37 221 November 15 1972
- Federal Register “Voluntary Fuel Economy Labeling Program for 1975 Model Automobiles,” 39 200 October 15 1974
- Report by the Committee On Motor Vehicle Emissions Commission on Sociotechnical Systems National Academy of Sciences November 1974
- Matula, Richard A. Consultant Report to the Committee on Motor Vehicle Emissions, National Research Council “Emissions and Fuel Economy Test Methods and Procedures,” September 1974
- Paulsell, D. C Kruse, R. E. “Test Variability of Emission and Fuel Economy Measurements Using the 1975 Federal Test Procedures,” SAE Paper No. 741035 October 1974
- Ford Motor Company Application for Suspension of 1977 Motor Vehicle Exhaust Emission Standards Emission Test Variability and Correlation January 1975
- General Motors Request for Suspension of 1977 Federal Emissions Standards Fuel Economy Measurement January 10 1975
- Gryce, R. T. “Ford Auto/Emission Driver System,” SAE Paper No. 741007 October 1974
- Levijoki, A. Ayres, J. Yu, R. Hammel, M. “A Servo Vehicle Driver for EPA Emission Tests,” SAE Paper No. 730532 May 1973
- “The Development of the New SAE Motor Vehicle Fuel Economy Measurement Procedures,” SAE Paper No. 750001 February 1975
- SAE J1082 April 1974