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IMEP Estimation from Instantaneous Crankshaft Torque Variation
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English
Abstract
Crankshaft torque fluctuation has been theoretically analyzed and possible sources of error have been reviewed in the cases of determining the indicated mean effective pressure (Pmi) from measurement of the flywheel angular-speed fluctuation.
The specific objective of this study was to develop a new approach to determine Pmi from the crankshaft torque of a SI engine, and it has successfully proven that using an appropriate data processing for the angular-speed fluctuation, Pmi in low- to medium-speed ranges can be estimated with very high accuracy in terms of 99% or higher coefficient of correlation to the in-cylinder pressure sensor.
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Authors
Citation
lida, K., Akishino, K., and Kido, K., "IMEP Estimation from Instantaneous Crankshaft Torque Variation," SAE Technical Paper 900617, 1990, https://doi.org/10.4271/900617.Also In
References
- Konomi T. “ A New Measurement of IMEP Fluctuation at Idling, using a Highly Accurate Engine Angular-Speedometer ” JSMA Paper 149 446 Oct. 1983
- Takiguchi et al “A Study on Piston Friction in Small, High-Speed Gasoline Engine ” JSAE Paper No.38 1988
- Mizuno N. et al “ Analysis of Synchronous Belt Vibration in Automotive Valve Train ” SAE Paper No. 880077 1988
- Ina I. Obayashi H. Shigematsu T. “ Lean Limit A/F Control System by Using Engine Speed Variation” SAE Paper 860418 1986