RELATIONSHIP BETWEEN LOCAL AIR-FUEL RATIO AND COMBUSTION CHARACTER IN SPARK IGNITION ENGINES
A method for the direct measurement and quantitative analysis of hydrocarbon concentration at any desired point in an engine cylinder allows for the measurement of the air-fuel ratio of the mixture from the hydrocarbon (vaporized fuel) and oxygen concentrations. Either multi-cycle sampling (MCS) or single-cycle sampling (SCS) may be used. The MCS method was used to measure the distribution of air-fuel ratio in a two-stroke engine combustion chamber. Hydrocarbon and air-fuel ratio levels corresponding to crank angle were made in a stratified-charge engine combustion chamber. The SCS method was used to measure the air-fuel ratio at the ignition plug of a four-stroke engine. It was shown that the peak of maximum cylinder pressure is obtained at an air-fuel ratio of approximately 12:1 measured at the ignition plug; its value decreases at any ratio above or below that, suggesting that there is a distribution of air-fuel ratios within the combustion chamber.
- Presented at the SAE Congress and Exposition, Detroit, 27 February-3 March 1978.
Warrendale, PA United States 15096
- Ayusawa, T
- Nemoto, T
- Koo, Y
- Jo, S H
- Publication Date: 1978
- Features: References;
- Pagination: 18 p.
- TRT Terms: Combustion chambers; Fuel air mixtures; Hydrocarbons; Induction heating; Stratified charge engines
- Uncontrolled Terms: Air fuel ratio; Cylinders
- Subject Areas: Safety and Human Factors;
- Accession Number: 00395147
- Record Type: Publication
- Source Agency: National Highway Traffic Safety Administration
- Report/Paper Numbers: SAE 780147, HS-025 303U
- Files: HSL, USDOT
- Created Date: Jun 30 1985 12:00AM