The effects caused by the cylinder wall temperature variations are nontrivial in advanced combustion mode engine control, particularly in cold-start processes and transients when the combustion mode switches from one to another. Being affected by the engine coolant and operating conditions on a cycle-by-cycle basis, cylinder wall temperature is difficult to be directly measured, and it is typically viewed as an unknown disturbance or estimated as a quasi-static parameter. However, such treatments of the cylinder wall temperature may not be sufficient in sophisticated control of combustion processes. This paper aims to estimate the cylinder wall temperature, on a cycle-by-cycle basis, through cylinder pressure signals in diesel engines. In the proposed methods, the cylinder wall temperature is modeled as a disturbance in the in-cylinder pressure dynamics. Thus, the wall temperature in each cylinder can be estimated, on a cycle-by-cycle basis, by the disturbance observer methods in finite crankshaft angles. Furthermore, to reduce the cylinder wall temperature estimation errors caused by the high-frequency noises in the cylinder pressure signals, a robust disturbance observer is proposed and compared with a typical design method. Through GT-Power engine model simulations and engine experimental results, the observer effectiveness, noise attenuation properties, and applications on a multicylinder diesel engine are evaluated.
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November 2012
Research-Article
Engine Cycle-by-Cycle Cylinder Wall Temperature Observer-Based Estimation Through Cylinder Pressure Signals
Junmin Wang
Junmin Wang
1
e-mail: wang.1381@osu.edu
Department of Mechanical and Aerospace Engineering,
Department of Mechanical and Aerospace Engineering,
The Ohio State University
,Columbus, OH 43210
1Corresponding author.
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Fengjun Yan
e-mail: yan.373@osu.edu
Junmin Wang
e-mail: wang.1381@osu.edu
Department of Mechanical and Aerospace Engineering,
Department of Mechanical and Aerospace Engineering,
The Ohio State University
,Columbus, OH 43210
1Corresponding author.
Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, and CONTROL. Manuscript received April 15, 2011; final manuscript received February 6, 2012; published online September 26, 2012. Assoc. Editor: John R. Wagner.
J. Dyn. Sys., Meas., Control. Nov 2012, 134(6): 061014 (8 pages)
Published Online: September 26, 2012
Article history
Received:
April 15, 2011
Revision Received:
February 6, 2012
Citation
Yan, F., and Wang, J. (September 26, 2012). "Engine Cycle-by-Cycle Cylinder Wall Temperature Observer-Based Estimation Through Cylinder Pressure Signals." ASME. J. Dyn. Sys., Meas., Control. November 2012; 134(6): 061014. https://doi.org/10.1115/1.4006222
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