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The Dynamic Effect of Residual Gas Temperature on Combustion Torque at Idle
Technical Paper
2001-01-3558
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Event:
SAE 2002 World Congress & Exhibition
SAE International Fall Fuels & Lubricants Meeting & Exhibition
Language:
English
Abstract
The amount of residual gas present in the cylinder has a well documented effect on the combustion event at idle. The high levels of burnt gas present at low engine speed leads to significant cyclic variability. This paper presents research which indicates that the temperature of the residual gas, which can vary from event to event depending on the spark timing, also has a significant effect on the combustion torque. The more the spark timing is retarded from MBT timing, the more thermal energy is present in the exhaust gas. The idle speed control strategy typically varies the spark to give fast torque actuation for good speed regulation and hence the temperature of the residual gas may change significantly within the space of a few events. The paper shows evidence of the phenomenon (with fixed engine speed and air mass flow) and discusses possible causes. It then proceeds to develop a dynamic model for the behaviour. Finally the model is used in a feedback idle speed controller to compensate for the torque abnormalities. The results of the compensation technique are discussed and suggestions for further research are given.
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Authors
Topic
Citation
Ford, R. and Collings, N., "The Dynamic Effect of Residual Gas Temperature on Combustion Torque at Idle," SAE Technical Paper 2001-01-3558, 2001, https://doi.org/10.4271/2001-01-3558.Also In
Electronic Engine Controls 2002: Engine Control, Neural Networks and Non-Linear Systems
Number: SP-1689; Published: 2002-03-04
Number: SP-1689; Published: 2002-03-04
References
- Ford R.G. Robust Automotive Idle Speed Control in a Novel Framework Cambridge University 2000
- Ford R.G. Glover K. Spark Ignition Idle Speed Control Utilising a Novel Framework and Facilitating Control of the Tradeoff Between Fuel Consumption and Disturbance Rejection Capability. Proceedings AVEC 2000 Ann Arbor
- Heywood J. B. Internal Combustion Engine Fundamentals McGraw Hill 1988
- Ford R.G. Collings N. Measurement of Residual Gas Fraction using a Fast Response NO Sensor SAE paper 1999-01-0208 1999
- Various Kistler Cylinder Pressure Technical Documentation 1997
- Lancaster D.R. Measurement and Analysis of Engine Pressure Data SAE paper 750026 1975
- Bendat J.S. Piersol A.G. Random Data: Analysis and Measurement Procedures J. Wiley and Sons 1986