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Linear Regression and its Use in Predicting the Link Between Ionization Current and the Pressure Signal in a Hybrid Mode Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 16, 2006 by SAE International in United States
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Homogenous Charge Compression Ignition (HCCI) is an alternative to Spark Ignited (SI) combustion, which can provide part-load efficiencies as high as compression ignition engines and energy densities as high as SI engines, without high levels of NOx or Particulate Matter (PM). The principle of operation involves reaching the thermal oxidization barrier of a homogeneous air-fuel mixture. This combustion practice is enabled by diluting then compressing the mixture with the Trapped Residual Gases (TRG) to dilute the initial charge thus keeping combustion temperatures down.
Introduction of exhaust gasses in the mixture can be achieved by the use of early exhaust valve closure and late inlet valve opening. The charge is well mixed avoiding particulate emissions, and by using exhaust gasses for load regulation the need for throttled operation is removed allowing the realization of high efficiencies, low pumping losses and a resulting 15 - 20% improvement in fuel economy. One of the major disadvantages of HCCI is that it can only be used at part load conditions, and so it has been proposed that a ‘hybrid mode’ engine operation strategy could be used, where the engine uses SI operation at cold start, high load and idle. This demands a closed loop feedback control signal to give a seamless transition between SI (where Start of Combustion (SOC) is dictated by the spark plug) and HCCI (where SOC is unknown).
This paper investigated the use of an ion current sensor to accurately predict the Peak Pressure Position (PPP) and Peak Pressure Magnitude (PPM). This is achieved with the mathematically simple and computationally efficient approach of linear regression. This technique can be used between engine cycles so adjustments can be made to engine strategies to compensate for difficult conditions. The results showed that there is a definite correlation between the two signals and that the ion current can be used to control the engine during HCCI mode. Finally a good balance between computation time and accuracy was obtained using 20 cycles.
- K. Joyce - Department of Aeronautical and Automotive Engineering, Loughborough University
- R. Chen - Department of Aeronautical and Automotive Engineering, Loughborough University
- P. Osei-Owusu - Department of Aeronautical and Automotive Engineering, Loughborough University
- J. Patterson - Department of Aeronautical and Automotive Engineering, Loughborough University
- J. Turner - Lotus Engineering
CitationJoyce, K., Chen, R., Osei-Owusu, P., Patterson, J. et al., "Linear Regression and its Use in Predicting the Link Between Ionization Current and the Pressure Signal in a Hybrid Mode Engine," SAE Technical Paper 2006-01-3278, 2006, https://doi.org/10.4271/2006-01-3278.
- Foster D.E., and Najt P.M.; “Compression-ignited homogenous charge combustion”, Society of Automotive Engineers, (1983)
- Heffel J.; “NOx emission and performance data for a hydrogen fueled internal combustion engine at 1500 rpm using exhaust gas recirculation”, Int. Journal. Hydr Energy, (2003)
- Heffel J.; “NOx emission and performance data for a hydrogen fueled internal combustion engine at 3000 rpm using exhaust gas recirculation”, Int. Journal. Hydr Energy, (2003)
- Panousakis D., Gazis A., et al; “Analysis of SI combustion diagnostics methods using ion current sensing techniques”, SAE Paper No. 2006-01-1345, (2006)
- Gazis A., Panousakis D., et al; “Computationally Inexpensive methods of ion-current signal manipulation for predicting characteristics of engine in-cylinder pressure”, SAE Paper No. 2006-01-1088, (2006)
- Panousakis D., Gazis A., et al; “Using ion-current sensing techniques to interpret gasoline HCCI combustion processes”, SAE Paper No. 2006-01-0024, (2006)
- Saitzkoff A., Reinmann R., Mauss F., Glavmo M.; “In-cylinder pressure measurements using the sparkplug as an ionization sensor”, SAE Technical Paper Series, 970857, (1997)
- Calcote H.F.; “Ion production and recombination in flames” 8th Symposium on Combustion. (1962)
- Calcote H.F.; “Ion and electron profiles in flames” 9th Symposium on Combustion, (1963)
- Vressner A., Strandh P., et al; “Multiple Point Ion Current Diagnostics in an HCCI Engine”, SAE Paper No. 2004-01-0934, (2004)
- Vressner A.; “Fuel Effects on Ion Current in an HCCI Engine”, SAE Paper No. 2005-01-2093, (2005)
- Shimasaki Y., Kanehiro M., Baba S., Maruyama S., Hisaki T., and Miyata S.; “Spark plug voltage analysis for monitoring combustion in an internal combustion engine”, SAE Technical Paper Series. 930461, (1993)
- Saitzkoff A., Reinmann R., Berglind T., and Glavmo M.; “An ionization equilibrium analysis of the spark plug as an ionization sensor”, SAE Technical Paper Series, 960337, (1996)
- Yoshiyama S., Tomita E., and Hamamoto Y.; “Fundamental study on combustion diagnostics using a spark plug as ion probe”, SAE Technical Paper Series, 2000-01-2828, (2000)
- Aithal S.M., White A.R., Subramaniam V.V., Babu V., and Rizzoni G.; “A chemical kinetics model of current signatures in an ionization sensor”, AIAA Plasma dynamics and Lasers Conference. AIAA-1999-3606, (1999)
- Malaczynski G.W., and Baker M.E., “Real-time digital signal processing of ionization-current for engine diagnostics and control”, SAE Technical Paper Series, 2003-01-1119, (2003)
- Glavmo M., Spadafora P., and Bosch R.; “Closed loop start of combustion control utilizing ionization sensing in a diesel engine”, SAE Technical Paper Series, 1999-01-0549, (1999)
- Koopmans L., Backlund O., and Denbratt I.; “Cycle to cycle variations: Their influence on cycle resolved gas temperature and unburned hydrocarbons from a camless gasoline compression ignition engine”. SAE Technical Paper Series, 2002-01-0110, (2002)