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Soak Time Effects on Car Emissions and Fuel Economy
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1978 by SAE International in United States
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Five light-duty vehicles were used to investigate HC, CO, and NOx emissions and fuel economy sensitivity to changes in the length of soak period preceding the EPA Urban Dynamometer Driving Schedule (UDDS). Emission tests were conducted following soak periods 10 minutes to 36 hours in length. Each of the first 8 minutes of the driving cycle was studied separately to observe vehicle warm-up. Several engine and fuel system temperatures were monitored during soak and run periods and example trends are illustrated. The extent to which emission rates and fuel consumption are affected by soak period length is discussed.
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CitationSrubar, R., Springer, K., and Reineman, M., "Soak Time Effects on Car Emissions and Fuel Economy," SAE Technical Paper 780083, 1978, https://doi.org/10.4271/780083.
- Federal Register 40 126 June 30 1975
- Federal Register 42 124 June 28 1977
- Srubar R. L. “Emission and Fuel Economy Sensitivity to Changes in Light-Duty Federal Test Procedures.” Final Report to the Environmental Protection Agency under Contract No. 68-03-2196 May 1977