Transient Heating and Emissions of an SI Engine During the Warm-up Period 880264
The test procedures used to investigate the transient warm-up of two Ford 40 kW SI engines are described. Water, engine casing and lubricating oil temperatures were monitored and the rates of temperature rise determined as a function of engine speed and power. The temperature results showed that for both engines the lubricating oil was the slowest component in the warm-up and may be the limiting factor in engine warm-up. A particular emphasis has been placed on monitoring the gas composition during the warm-up. A special feature of this system is the use of two UHC FID analysers operating at 180°C and 2°C. The difference in the two UHC readings is a measure of the high molecular weight condensible UHC or unburnt liquid fuel that is emitted. It is shown that this is quite significant during the initial period of warm-up. NOx emissions showed a strong increase during the warm-up and this indicated that the combustion process took an appreciable time to achieve its maximum flame temperature.
Citation: Andrews, G., Harris, J., and Ounzain, A., "Transient Heating and Emissions of an SI Engine During the Warm-up Period," SAE Technical Paper 880264, 1988, https://doi.org/10.4271/880264. Download Citation
Author(s):
G.E. Andrews, J.R. Harris, A. Ounzain
Affiliated:
Department of Fuel and Energy, The University of Leeds, Leeds. UK
Pages: 16
Event:
SAE International Congress and Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Lubricating oils
Spark ignition engines
Test procedures
Combustion and combustion processes
Water
Gases
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