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Modelling Combustion Variability in LPG Injected Engines for Improved Engine Performance at Idle
Technical Paper
2004-01-0420
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The variability of in-cylinder combustion of gasoline at idle has been investigated previously, culminating in the development of a model relating the past and future indicated torque deviations from the mean at given engine operating conditions of intake manifold pressure, engine speed and spark advance. The developed model has the potential to be used in an idle speed control algorithm to improve vehicle noise vibration and harshness (NVH) at low engine speeds and loads. While environmental considerations have spawned the development of liquefied petroleum gas (LPG) as a viable alternative fuel, adaptation of the variability model to multipoint LPG injected automotive engines is complicated by the fact that the fuel mixture concentrations of propane and butane are subject to wide variations depending on a variety of factors including geographic location and local market pricing. Furthermore, evidence on one engine family suggests that the variability of torque production using LPG injection under cold start conditions is significantly higher than that observed with gasoline injection, a condition that is improved through enhanced modeling of the cyclic torque production process, and subsequent compensation. This paper investigates the development of a model relating past and present indicated torque deviations from the mean at a given engine operating condition in LPG, and explores the variability inherent in the model as a function of temperature. The implication is the model may be incorporated into an idle speed control algorithm, which will provide improved idle speed regulation in multipoint injected LPG vehicles.
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Citation
Manzie, C. and Watson, H., "Modelling Combustion Variability in LPG Injected Engines for Improved Engine Performance at Idle," SAE Technical Paper 2004-01-0420, 2004, https://doi.org/10.4271/2004-01-0420.Data Sets - Support Documents
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References
- Butts K., Sivashankar N., and Sun J., “Application of L1 Optimal Control to the Engine Idle Speed Control Problem,” IEEE Transactions on Control Systems Technology, vol. 7, pp. 258-270, 1999.
- Ford R., “Robust Automotive Idle Speed Control in a Novel Framework,” PhD Thesis in Department of Engineering: The University of Cambridge, 2000.
- Li X. and Yurkovich S., “Sliding Mode Control of Delayed Systems With Application to Engine Idle Speed Control,” IEEE Transactions on Control Systems Technology, vol. 9, pp. 802-810, 2001.
- Hrovat D. and Sun J., “Models and Control Methodologies for IC Engine Idle Speed Control Design,” Control Engineering Practice, vol. 5, pp. 1093-1100, 1997.
- Manzie C. and Watson H. C., “A Novel Approach to Disturbance Rejection in Idle Speed Control Towards Reduced Idle Fuel Consumption,” Proceedings of the Institute of Mechanical Engineers Part D: Journal of Automobile Engineering, vol. 217, pp. 677-690, 2003.
- Rizzoni G., “A Stochastic Model for the Indicated Pressure Process and the Dynamics of the Internal Combustion Engine,” IEEE Transactions on Vehicular Technology, vol. 38, pp. 180-192, 1989.
- Ford R. and Collings N., “The Dynamic Effect of Residual Gas Temperature on Combustion Torque at Idle,” SAE Paper 2001-01-3558, 2001.
- Manzie C., Watson H., and Baker P., “Modeling the effects of combustion variability for application to idle speed control in SI engines,” presented at SAE Powertrain and Fluid Systems Conference, 2002, SAE paper 02FFL-271, San Diego, USA, 2002.
- Cho D. and Hedrick J. K., “Automotive Powertrain Modelling for Control,” Transactions of the ASME, pp. 568-576, 1989.