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Test Variability of Emission and Fuel Economy Measurements Using The 1975 Federal Test Procedure
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English
Abstract
Several sets of repetitive test data using the 1975 Federal Test Procedure ('75 FTP) have been analyzed to establish the variability of each component measured during each phase of the test.
The variability characteristics of four different emission control systems have been discussed and compared. The overall variabilities of the '75 FTP composite values have been assessed at ±6% for hydrocarbons and CO, ±3% for NOx, and ±1% for CO2.
The extremely repeatable behavior of the CO2 emissions is utilized to calculate the fuel economy during the test. This calculation is discussed and some fuel economy results from repetitive tests are presented.
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Citation
Paulsell, C. and Kruse, R., "Test Variability of Emission and Fuel Economy Measurements Using The 1975 Federal Test Procedure," SAE Technical Paper 741035, 1974, https://doi.org/10.4271/741035.Also In
References
- Federal Register “Control of Air Pollution from New Motor Vehicles.” 35 136 July 15 1970
- Federal Register “Exhaust Emission Standards and Test Procedures.” 36 128 July 2 1971
- Langley Russell “Practical Statistics.” New York Dover Publications, Inc. 1970
- Hoel Paul G. “Introduction of Mathematical Statistics.” New York John Wiley and Sons, Inc. 1954
- Environmental Protection Agency “A Report on Automobile Fuel Economy.” October 1973
- Environmental Protection Agency “A Comparative Study of the Fuel Economy Characteristics of Rotary Engine Vehicles and Conventional Reciprocating Engine Vehicles.” Test and Evaluation Branch, Emission Control Technology Division, Office of Mobile Source Air Pollution Control April 1974