Research Papers

Engine Cycle-by-Cycle Cylinder Wall Temperature Observer-Based Estimation Through Cylinder Pressure Signals

[+] Author and Article Information
Fengjun Yan

Junmin Wang1

Department of Mechanical and Aerospace Engineering,  The Ohio State University, Columbus, OH 43210wang.1381@osu.edu


Corresponding author.

J. Dyn. Sys., Meas., Control 134(6), 061014 (Sep 26, 2012) (8 pages) doi:10.1115/1.4006222 History: Received April 15, 2011; Revised February 06, 2012; Published September 26, 2012

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.

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 1

Heat transfer to the cylinder wall during combustion

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Figure 2

In-cylinder wall temperature estimation in a GT-Power engine model

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Figure 3

A fully instrumented medium-duty diesel engine test bench

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Figure 4

Measured engine coolant temperature variation during a cold-start

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Figure 5

In-cylinder pressure traces

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Figure 6

Cylinder pressure variations without heat transfer from fuel combustion

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Figure 7

Observer 2 output in crank angle domain for one cylinder in one cycle

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Figure 8

Cylinder wall temperature estimation by observer 1

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Figure 9

Cylinder wall temperature estimation by observer 2

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Figure 10

Noise influence comparisons for observer 1

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Figure 11

Noise influence comparisons for observer 2

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Figure 12

V8 medium-duty diesel engine cylinder layout

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Figure 13

Cylinder wall temperature estimations by fuel injection imbalances



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