This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Modeling the Effects of Combustion Variability for Application to Idle Speed Control in SI Engines
Technical Paper
2002-01-2734
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Combustion in the cylinder of a spark ignition engine, particularly under low load conditions, is subject to cycle-by-cycle variations due to factors such as mixture quality and quantity and internal exhaust gas recirculation. The major result of this phenomenon is an increase in the variability of indicated engine torque at a given engine operating point. Automotive control problems dealing with torque production at low engine loads, particularly the control of idle speed, rely on accurate information about the transfer functions of different engine subsystems, however combustion variability and the effect it has on torque production is often overlooked. In this paper we illustrate the effects that combustion variability at idle has on different transfer functions related to indicated torque, and propose new models for torque production at constant operating points. We also present a model of an in-line, six-cylinder, 4.0 litre Ford engine for use in idle speed simulations and control applications. The integration of combustion variability into an idle speed control framework is also discussed.
Recommended Content
Authors
Citation
Manzie, C., Watson, H., and Baker, P., "Modeling the Effects of Combustion Variability for Application to Idle Speed Control in SI Engines," SAE Technical Paper 2002-01-2734, 2002, https://doi.org/10.4271/2002-01-2734.Also In
References
- Hendricks, E. et al. Modeling of the Intake Manifold Filling Dynamics SAE Paper 960037 1996
- Shrestha, S.O.B. Karim G.A. Considering the Effects of Cyclic Variations when Modeling the Performance of a Spark Ignition Engine SAE Paper 2001-01-3600 2001
- Proakis, J.G. Manolakis D.G. Digital Signal Procesing. Principles, Alogrithms and Applications Second Edition 1992 New York Macmillan Publishing Company
- Ford, R. Collings N. The Dynamic Effect of Residual Gas Temperature on Combustion Torque at Idle SAE Paper 2001-01-3558 2001
- Cho, D. Hedrick J.K. Automotive Powertrain Modelling for Control Transactions of the ASME 1989 568 576
- Liu, Y. Strategies for Improving Vehicle Energy Efficiency The University of Melbourne 1992
- Moro, D. Cavina N. Ponti F. In-Cylinder Pressure Reconstruction Based on Instantaneous Engine Speed Signal Journal of Engineering for Gas Turbines and Power 2002 124 220 225
- Manzie, C. Palaniswami M. Watson H. Gaussian Networks for Fuel Injection Control Proceedings of the Institute of Mechanical Engineers: Part D Journal of Automobile Engineering 2001 215 10 1053 1068