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Soot Formation in a Multipoint-Fuel-Injected Spark-Ignited Engine
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English
Abstract
Higher levels of carbon in the oil of some multipoint-fuel-injected spark-ignited engines have been observed relative to carbureted and/or Throttle-Body-Injected (TBI) systems. These higher carbon levels could potentially shorten the oil change interval or cause engine wear. It has been theorized that carbon in the oil is caused by soot produced during the combustion process. Vehicle tests were run to show that this soot has no environmental impact. This paper discusses soot formation and how to minimize this formation by controlling injection parameters (direction, timing, method, and spray) and engine conditions (speed, load, coolant temperature, EGR rate, inlet air temperature, and spark advance). Effects on engine emissions and peak cylinder pressures are also addressed.
OBJECTIVE
The objective of this study was to understand soot (smoke), emissions, and cylinder pressure characteristics associated with injection parameters (direction, timing, method, and spray) and engine operating conditions (speed, load, coolant temperature, EGR rate, inlet air temperature, and spark advance).
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Citation
Kosowski, M., "Soot Formation in a Multipoint-Fuel-Injected Spark-Ignited Engine," SAE Technical Paper 850294, 1985, https://doi.org/10.4271/850294.Also In
Developments in Electronic Engine Management and Driveline Controls
Number: SP-0609; Published: 1985-03-01
Number: SP-0609; Published: 1985-03-01
References
- Wagner H. G. “Soot Formation in Combustion.” Seventeenth Symposium (International) on Combustion The Combustion Institute Pittsburgh, Pennsylvania 1978 3
- Peters B. D. “Fuel Droplets Inside the Cylinder of a Spark-Ignition Engine with Axial Stratification,” SAE Paper No. 820132 presented at the International Congress and Exposition Detroit, Michigan February 22 26 1982