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Research Papers: Internal Combustion Engines

HCCI Engine Combustion Phasing Prediction Using a Symbolic-Statistics Approach

[+] Author and Article Information
Ahmad Ghazimirsaied

Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, T6G 2G8, Canadaghazimir@ualberta.ca

Mahdi Shahbakhti

Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, T6G 2G8, Canada

Charles Robert Koch1

Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, T6G 2G8, Canadabob.koch@ualberta.ca

1

Corresponding author.

J. Eng. Gas Turbines Power 132(8), 082805 (May 27, 2010) (5 pages) doi:10.1115/1.4000297 History: Received May 21, 2009; Revised June 02, 2009; Published May 27, 2010; Online May 27, 2010

Temporal dynamics of cyclic variation in a homogeneous charge compression ignition (HCCI) engine near misfire is analyzed using chaotic theory methods. The analysis of variation in consecutive cycles of CA50 (crank angle of 50% mass fraction fuel burnt) for an n-heptane fueled engine is performed for a test point near the misfire condition. The return map of the time series of CA50 cycle values reveals the deterministic and random portions of dynamics near misfire occurring in an HCCI engine. A symbol-statistic approach is also used to find the occurrence of possible probabilities of the data points under the same operating conditions. These techniques are then used to predict CA50 one cycle ahead. Simulated data points in phase space have similar dynamical structure to the experimental measurements.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 2

Flowchart: using chaotic tools for nonlinear prediction

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Figure 5

Comparing predicted CA50 return map to experiment (for validation data—cycles 3001–6000 for conditions as in Fig. 3

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Figure 7

Prediction error between predicted CA50 values and experimental measurements for HCCI combustion—conditions as in Fig. 3

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Figure 8

Autocorrelation of residuals for predicted CA50 consecutive cycles for HCCI combustion—conditions as in Fig. 3

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Figure 1

Schematic of the experimental setup

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Figure 3

CA50 return map for HCCI combustion under these conditions: engine speed of 1000 rpm, Tman44°C, Pman 94.5 kPa, λ 2.34

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Figure 4

CA50 symbol-sequence histogram with (n=8, L=3) for HCCI combustion cycles 1–3000 conditions as in Fig. 3

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Figure 6

Simulated CA50 return map including noise compared with experimental measurements for HCCI combustion cycles 3001 to 6000—conditions as in Fig. 3

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