INCREASED BURNING RATES OFFER IMPROVED FUEL ECONOMY-NOX EMISSIONS TRADE-OFFS IN SPARK-IGNITION ENGINES
Mass burning rate was varied by using two single-cylinder engines, each fitted with different combustion-chamber geometries. The slower-burning chamber incorporated a side-mounted spark plug, the faster-burning chamber combined a more compact combustion space and a centrally located spark plug. The faster-burning engine exhibited an improved efficiency-NOx emissions trade-off, primarily due to the engine's higher maximum thermal efficiency and greater tolerance to charge dilution by recirculated exhaust gas. Faster burning also reduced cyclic variability in combustion, increased the knock-limited thermal efficiency, but offered no advantage in regard to hydrocarbon emissions.
- Prepared for SAE Meeting, 26 February-2 March, 1979.
Warrendale, PA United States 15096
- Tuttle, J H
- Toepel, R R
- Publication Date: 1979
- Features: References;
- Pagination: 15 p.
- Society of Automotive Engineers Preprint
- Publisher: Society of Automotive Engineers (SAE)
- TRT Terms: Combustion chambers; Economic efficiency; Exhaust gases; Fuel conservation; Fuel consumption; Hydrocarbons; Internal combustion engines; Nitric oxide; Nitrogen oxides; Pollutants; Spark ignition engines; Spark plugs; Vehicle power plants
- Uncontrolled Terms: Efficiency
- Old TRIS Terms: Automobile engines
- Subject Areas: Economics; Energy; Highways; Vehicles and Equipment;
- Accession Number: 00301521
- Record Type: Publication
- Source Agency: Engineering Index
- Report/Paper Numbers: SAE 790388
- Files: TRIS
- Created Date: Nov 7 1979 12:00AM