The instantaneous IMEP method is used to measure crank-angle resolved in-cylinder friction force in a series production spark ignition engine as a function of design parameters and operating conditions. An improved telemetry system, which continues to provide data after 50+ hours of operation at speeds as high as 2000 rpm, is presented. Primary sources of error associated with the technique will be presented. These include intra-cycle engine speed fluctuations, the effect of thermal shock on pressure transducers, the effect of connecting rod force calibration and measurement error. The instantaneous IMEP method is used to measure crank-angle resolved in-cylinder engine friction as functions of engine speed and coolant (oil-film) temperature. Both crank-angle resolved and cycle-integrated results are compared.
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World Tribology Congress III
September 12–16, 2005
Washington, D.C., USA
Conference Sponsors:
- Tribology Division
ISBN:
0-7918-4202-9
PROCEEDINGS PAPER
Crank-Angle Resolved In-Cylinder Friction Measurements With the Instantaneous IMEP Method
M. E. Leustek,
M. E. Leustek
University of Michigan, Ann Arbor, MI
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Z. Filipi,
Z. Filipi
University of Michigan, Ann Arbor, MI
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D. Assanis
D. Assanis
University of Michigan, Ann Arbor, MI
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M. E. Leustek
University of Michigan, Ann Arbor, MI
C. Sethu
University of Michigan, Ann Arbor, MI
S. Bohac
University of Michigan, Ann Arbor, MI
Z. Filipi
University of Michigan, Ann Arbor, MI
D. Assanis
University of Michigan, Ann Arbor, MI
Paper No:
WTC2005-63677, pp. 571-572; 2 pages
Published Online:
November 17, 2008
Citation
Leustek, ME, Sethu, C, Bohac, S, Filipi, Z, & Assanis, D. "Crank-Angle Resolved In-Cylinder Friction Measurements With the Instantaneous IMEP Method." Proceedings of the World Tribology Congress III. World Tribology Congress III, Volume 2. Washington, D.C., USA. September 12–16, 2005. pp. 571-572. ASME. https://doi.org/10.1115/WTC2005-63677
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