Increased residual levels in homogeneous charge compression ignition (HCCI) engines employing valve strategies such as recompression or negative valve overlap (NVO) imply that accurate estimation of residual gas fraction (RGF) is critical for cylinder pressure heat release analysis. The objective of the present work was to evaluate three residual estimation methods and assess their suitability under naturally aspirated and boosted HCCI operating conditions: (i) the simple state equation method employs the ideal gas law at exhaust valve closing (EVC); (ii) the Mirsky method assumes isentropic exhaust process; and (iii) the Fitzgerald method models in-cylinder temperature from exhaust valve opening (EVO) to EVC by accounting for heat loss during the exhaust process and uses measured exhaust temperature for calibration. Simulations with a calibrated and validated “virtual engine” were performed for representative HCCI operating conditions of engine speed, fuel-air equivalence ratio, NVO and intake pressure (boosting). The state equation method always overestimated RGF by more than 10%. The Mirsky method was most robust, with average errors between 3–5%. The Fitzgerald method performed consistently better, ranging from no error to 5%, where increased boosting caused the largest discrepancies. A sensitivity study was also performed and determined that the Mirsky method was most robust to possible pressure and temperature measurement errors.
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August 2012
Internal Combustion Engines
Assessment of Residual Mass Estimation Methods for Cylinder Pressure Heat Release Analysis of HCCI Engines With Negative Valve Overlap
Elliott A. Ortiz-Soto,
Elliott A. Ortiz-Soto
University of Michigan – Ann Arbor
, Ann Arbor, MI 48109-2133
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Jiri Vavra,
Jiri Vavra
Czech Technical University in Prague
, Prague, 166 07, Czech Republic
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Aristotelis Babajimopoulos
Aristotelis Babajimopoulos
University of Michigan – Ann Arbor
, Ann Arbor, MI 48109-2133
Search for other works by this author on:
Elliott A. Ortiz-Soto
University of Michigan – Ann Arbor
, Ann Arbor, MI 48109-2133
Jiri Vavra
Czech Technical University in Prague
, Prague, 166 07, Czech Republic
Aristotelis Babajimopoulos
University of Michigan – Ann Arbor
, Ann Arbor, MI 48109-2133J. Eng. Gas Turbines Power. Aug 2012, 134(8): 082802 (9 pages)
Published Online: June 11, 2012
Article history
Received:
October 31, 2011
Revised:
November 5, 2011
Online:
June 11, 2012
Published:
June 11, 2012
Citation
Ortiz-Soto, E. A., Vavra, J., and Babajimopoulos, A. (June 11, 2012). "Assessment of Residual Mass Estimation Methods for Cylinder Pressure Heat Release Analysis of HCCI Engines With Negative Valve Overlap." ASME. J. Eng. Gas Turbines Power. August 2012; 134(8): 082802. https://doi.org/10.1115/1.4006701
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