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A Study on the Use of Combustion Phase Indicators for MBT Spark Timing on a Bi-Fuel Engine
Technical Paper
2007-24-0051
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The performance of a spark ignition engine strongly depends on the phase of the combustion process with respect to piston motion, and hence on the spark advance; this fundamental parameter is actually controlled in open-loop by means of maps drawn up on the test bench and stored in the Electronic Control Unit (ECU). Bi-fuel engines (e.g. running either on gasoline or on natural gas) require a double mapping process in order to obtain a spark timing map for each of the fuels. This map based open-loop control however does not assure to run the engine always with the best spark timing, which can be influenced by many factors, like ambient condition of pressure, temperature and humidity, fuel properties, engine wear. A feedback control instead can maintain the spark advance at its optimal value apart from operative and boundary conditions, so as to gain the best performance (or minimum fuel consumption). Such a control can be realized using as pilot variable a combustion phase indicator, i.e. a parameter which depends exclusively on the phase of the heat release process and assumes a fixed value for optimal spark timing. The purpose of the present work is to compare the behaviour of the most used combustion phase indicators using two different fuels one after the other (common gasoline and Compressed Natural Gas, CNG) on the same engine, in order to assess the influence of different heat release progress and to verify the possibility to feedback control the spark timing apart from the fuel used. The comparison has been carried on by means of experimental test on the engine test bench, analysing in-cylinder pressure acquired with varying spark advance for different operative conditions of engine speed, load and air-to-fuel ratio.
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Pipitone, E. and Beccari, A., "A Study on the Use of Combustion Phase Indicators for MBT Spark Timing on a Bi-Fuel Engine," SAE Technical Paper 2007-24-0051, 2007, https://doi.org/10.4271/2007-24-0051.Also In
References
- Pestana Gregg W. “Engine control methods using combustion pressure feedback” SAE Paper 890758
- Plint M Martyr A. “Engine Testing - Theory and practice” 2nd Butterworth & Heinemann 1999
- Pipitone E. Beccari A. “Proportional integral spark timing control by means of in-cylinder pressure analysis” FISITA 2004 - World Automotive Congress May 3-27 2004 Barcelona
- Pipitone E. “A comparison between combustion phase indicators for optimal spark timing” www.pipitone.dima.unipa.it/pubblicazioni.htm
- Kawamura Yoshihisa Shinshi Mamoru Sato Hiroshi Takahashi Nobutaka Iriyama Masahiro “MBT control through individual cylinder pressure detection” SAE Paper 881779
- Powell J. David “Engine control using cylinder pressure: past, present and future” Journal of Dynamic Systems, Measurement and Control 115 June 1993
- Eriksson L. “Spark advance modelling and control” Linkoping Studies in Science and Technology 1999 www.vehicular.isy.liu.se
- Cook Harvey, A. Heinicke Orville H. Haynie William H. “Spark-timing control based on correlation of maximum-economy spark timing, flame-front travel, and cylinder pressure rise” NACA Technical note 1217 1947
- Rassweiler Gerald M. Withrow L. “Motion pictures of engine flames correlated with pressure cards” SAE Paper 800131
- Amann Charles A. “Cylinder pressure measurement and its use in engine research” SAE Paper 852067
- Stone C. R. Green-Armytage D. I. “Comparison of methods for the calculation of mass fraction burnt from engine pressure-time diagrams” Proceedings of the Institution of Mechanical Engineering 201 D1 1987
- Shayler P. J. Wiseman M. W. Ma T. “Improving the determination of mass fraction burnt” SAE Paper 900351
- Brunt Michael F. Rai Harjit Emtage Andrew L. “The calculation of heat release from engine pressure data” SAE Paper 981052
- Bargende M. “Most Optimal Location of 50% Mass Fraction Burned and automatic knock detection” MTZ 56 10 1995
- Leonhardt S. Muller N. Isermann R. “Methods for engine supervision and control based on cylinder pressure information” IEEE/ASME Transactions on Mechatronics 4 3 September 1999
- Matekunas Frederic A. Battiston Paul A. Chang C. F. Sellnau Mark C. Lancaster David R. “Cylinder-pressure-based engine control using pressure-ratio-management and low-cost non-intrusive cylinder pressure sensor” SAE Paper 2000-01-0932
- Randolph Andrew L. “Methods of processing cylinder-pressure transducer signals to maximize data accuracy” SAE Paper 900170
- Brunt Michael F. J. Pond Christopher R. “Evaluation of techniques for absolute cylinder pressure correction” SAE Paper 970036