This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
The Effects of Knock on the Hydrocarbon Emissions of a Spark-Ignition Engine
Annotation ability available
Sector:
Language:
English
Abstract
To determine the effects of knock in a spark-ignition, single-cylinder engine with cooled exhaust upon the exhaust composition, exhaust products (CO, CO2, and total hydrocarbons) were measured by non-dispersive infrared analyzers (NDIRA) and by a flame ionization detector (FID). Individual hydrocarbons were separated on a gas-liquid chromatograph.
In fuel-rich mixtures, the FID indicated noticible decreases in the hydrocarbon concentrations in the presence of knock. The NDIRA did not indicate a decrease in the hydrocarbons at knock of lower intensities but showed decreases in hydrocarbons at knock of higher intensities. Chromatograms indicated a preferential decreases in acetylene at the time of knock, causing different responses at lower intensities. In fuel-lean mixtures, no apparent effect of knock on the hydrocarbons was indicated.
Thus, it was concluded that in fuel-rich to stoichiometric regions, knock generally decreases the hydrocarbon concentration in the exhaust and the extent of the decreases is greater with the intensity of knock.
Recommended Content
Authors
Citation
Davis, H., Uyehara, O., and Myers, P., "The Effects of Knock on the Hydrocarbon Emissions of a Spark-Ignition Engine," SAE Technical Paper 690085, 1969, https://doi.org/10.4271/690085.Also In
References
- Daniel W. A. “Engine Variable Effects on Exhaust Hydrocarbon Composition (A Single-Cylinder Engine Study with Propane as the Fuel).” SAE Transactions 76 paper 670124
- Boerlage G. D. “Detonation and Auto-ignition: Some Considerations on Methods of Determination.” NACA TM 843 December 1937
- Shinn J. N. Olson D. R. “Some Factors Affecting Unburned Hydrocarbons in Engine Combustion Products.” ”Vehicle Emissions,” SAE Progress in Technology 6 137
- Huls Thomas A. “Spark-Ignition Engine Operation and Design for Minimum Exhaust Emission.” Transactions 75 1967 paper 660405
- Daniel, W. A. “Flame Quenching at the Walls of an Internal Combustion Engine.” Sixth Symposium of Combustion New York Rienhold Publishing Corp. 1957 886
- Daniel W. A. Wentworth, J. T. “Exhaust Gas Hydrocarbons - Genesis and Exodus.” “Vehicle Emissions,” SAE Progress in Technology Series 6 1964 204
- Trumpy D. 1968
- Scheffler, C. E. “Combustion Chamber Surface Area, A Key to Exhaust Hydrocarbons.” SAE Transactions 75 1967 paper 660111
- Obert E. F. “Internal Combustion Engine Analysis and Practice.” Scranton, Pa International Textbook Co. 1950 2nd Ed
- Newhall H.K. 1968
- Caris D. F. Nelson E. E. “A New Look at High Compression Engines.” Paper 61A presented at SAE Summer Meeting, Atlantic City June 1958 10
- Miller S.A. “Acetylene, its Properties, Manufacture, and Uses.” New York Academic Press 1965 373