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Methanol Vehicle Emissions Round Robin Test Program
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English
Abstract
A vehicle emissions round robin test program was conducted using a methanol-fueled vehicle operating on M85. Each of 16 participants conducted two to six Federal Test Procedure (FTP) emissions tests. All participants measured emission rates of hydrocarbon (HC), CO, NOx, methanol, formaldehyde, and acetaldehyde. One participant, designated as a reference lab, conducted emissions testing at the beginning, the end, and two intermediate times during the round robin. Results of the reference lab demonstrated that no significant drift in emissions levels occurred during the 2-year program.
Relative lab-to-lab variability for FTP-composite emissions was lowest for NOx, with a coefficient of variation (C.V.) of 12%. CO variability was 16%, HC variabilities (by GC and bench FID) were 17 and 35%, respectively. Methanol, formaldehyde, and acetaldehyde were found to have variabilities of 34, 17, and 63%, respectively. The large difference between formaldehyde and acetaldehyde variability is probably a consequence of their different concentrations--formaldehyde's emission rate was approximately 40 times that of acetaldehyde. This is consistent with an expected increase in variability at emission levels near detection limits. Emission rates of three HC species were also determined: methane, benzene, and toluene. They showed variabilities ranging from 20-30%, only slightly higher than for the criteria emissions.
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Citation
Hoekman, S. and Jensen, T., "Methanol Vehicle Emissions Round Robin Test Program," SAE Technical Paper 932773, 1993, https://doi.org/10.4271/932773.Also In
References
- “Emissions and Air Quality Modeling Results From Methanol/Gasoline Blends in Prototype Flexible/Variable Fuel Vehicles,” Auto/Oil Air Quality Improvement Research Program January 1992
- Gorse, R. A. Jr. et al. “The Effects of Methanol/Gasoline Blends on Automobile Emissions,” SAE Technical Paper No. 920327 1992
- Swarin S. J. et al. “Advanced Emission Speciation Methodologies for the Auto/Oil Air Quality Improvement Research Program - II. Aldehydes, Ketones, and Alcohols,” SAE Technical Paper No. 920321 1992
- Siegl W. O. et al. “Improved Emissions Speciation Methodology for Phase II of the Auto/Oil Air Quality Improvement Research Program - Hydrocarbons and Oxygenates,” SAE Technical Paper No. 930142 1993
- Jensen T. E. et al. “Advanced Emission Speciation Methodologies for the Auto/Oil Air Quality Improvement Research Program - I. Hydrocarbons and Ethers,” SAE Technical Paper No. 920321 1992
- EPA fuel economy calculation for mixtures of gasoline and methanol Federal Register 56 41 8867 1991
- Hochhauser A. M. et al. “Fuel Composition Effects on Automotive Fuel Economy - Auto/Oil Air Quality Improvement Research Program,” SAE Technical Paper No. 930138 1993
- California Air Resources Board “Proposed Regulations for Low-Emission Vehicles and Clean Fuels,” August 13 1990