Increased Burning Rates Offer Improved Fuel Economy-NOx Emissions Trade-Offs in Spark-Ignition Engines

790388

02/01/1979

Event
1979 Automotive Engineering Congress and Exposition
Authors Abstract
Content
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.
Meta TagsDetails
DOI
https://doi.org/10.4271/790388
Pages
13
Citation
Tuttle, J., and Toepel, R., "Increased Burning Rates Offer Improved Fuel Economy-NOx Emissions Trade-Offs in Spark-Ignition Engines," SAE Technical Paper 790388, 1979, https://doi.org/10.4271/790388.
Additional Details
Publisher
Published
Feb 1, 1979
Product Code
790388
Content Type
Technical Paper
Language
English