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Development of a Practical Correlative I/M Exhaust Emission Test
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Abstract
The 1990 amendment to the Clean Air Act (CAA) mandates enhanced inspection and maintenance (I/M) programs for the three most severely polluted nonattainment area classes. The State of Arizona Emissions Research Laboratory (ERL) is currently studying alternative methods, procedures, and equipment to determine the minimum technological limits required to produce acceptable Federal Test Procedure (FTP) correlative data and avoid excessive test precision losses. The first phase of the study, development of the driving trace, has shown that a 95 second loaded transient test (AZ95) yields results that are statistically similar to the 240 second loaded transient test (IM240) with respect to test repeatability and correlation to FTP derived tailpipe emissions.
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Citation
Cox, F., "Development of a Practical Correlative I/M Exhaust Emission Test," SAE Technical Paper 922317, 1992, https://doi.org/10.4271/922317.Also In
References
- “Clean Air Act, Law and Explanation” Commerce Clearing House December 1990
- Watson, William E. “Arizona Vehicle Inspection Program, 1991 Annual Report.”
- “EPA High-Tech I/MTests: Background Materials for Developing an RFP” U.S. Environmental Protection Agency March 1992
- “U.S. Code of Federal Regulations” July 1 1988
- “U.S. Code of Federal Regulations” July 1 1988
- “Emission Benefits of Oxygenated Gasoline Blends: Results of the Arizona DEQ Test Program” Energy and Environmental Analysis, Inc. Arizona Department of Environmental Quality April 1991
- Pidgeon. William M. Dobie, Natalie “The IM240 Transient I/M Dynamometer Driving Schedule and the Composite I/M Test Procedure” EPA-AA-TSS-91-1 January 1991
- Glover, Edward L. Clemmens, William B. “Identifying Excess Emitters with a Remote Sensing Device: A Preliminary Analysis” U.S. Environmental Protection Agency
- “Enhanced I/M Costs and Benefits” U.S. Environmental Protection Agency December 1991