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The Effect of Ambient Temperature on Exhaust Emissions of Cars with Experimental Emission Controls
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Abstract
Three production cars and seven cars with various experimental exhaust emission control systems were tested to determine the effect of winter weather ambient temperatures on exhaust emissions. All of the cars were tested at 70, 40, and 20°F, and one was tested at 0°F using the 1972 EPA test schedule. Modal and bag emission data as well as catalytic converter temperature data were obtained. The results of these tests are presented in this paper. There was an increase in HC and CO emissions as ambient temperature was reduced. Most of the increase came from the first cycle of the 18 cycle test and was the result of additional time required to reach operating temperatures. NOx emissions did not vary substantially with ambient temperature.
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Miles, D. and Homfeld, M., "The Effect of Ambient Temperature on Exhaust Emissions of Cars with Experimental Emission Controls," SAE Technical Paper 741052, 1974, https://doi.org/10.4271/741052.Also In
References
- “Air Quality Criteria for Carbon Monoxide.” U.S. Dept of Health, Education and Welfare, National Air Pollution Control Administration Publication AP-62 March 1970 6 3
- Robertson J. E. “The Impact of Vehicle Emissions on Air Quality at Low Ambient Temperatures.” Paper 741054 SAE Automobile Engineering Meeting Toronto October 1974
- Genslak S. L. “Evaluation of Gaseous Fuels for Automobiles.” SAE Transactions 81 1972 paper 720125
- Grinberg L. Morgan L. E. “Effect of Temperature on Exhaust Emissions.” Paper 740527 SAE Commercial Vehicle Engineering and Fuels and Lubricants Meeting Chicago June 1974