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Research Papers

A Control-Oriented Model for Trajectory-Based HCCI Combustion Control

[+] Author and Article Information
Chen Zhang

Department of Mechanical Engineering,
University of Minnesota,
Twin-Cites Campus,
111 Church Street SE, ME 452,
Minneapolis, MN 55455
e-mail: zhan2314@umn.edu

Zongxuan Sun

Department of Mechanical Engineering,
University of Minnesota,
Twin-Cites Campus,
111 Church Street SE, ME 3110,
Minneapolis, MN 55455
e-mail: zsun@umn.edu

1Corresponding author.

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT,AND CONTROL. Manuscript received March 2, 2017; final manuscript received February 28, 2018; published online April 30, 2018. Assoc. Editor: Tesheng Hsiao.

J. Dyn. Sys., Meas., Control 140(9), 091013 (Apr 30, 2018) (10 pages) Paper No: DS-17-1133; doi: 10.1115/1.4039664 History: Received March 02, 2017; Revised February 28, 2018

Previously, the authors have proposed the concept of piston trajectory-based homogeneous charge compression ignition (HCCI) combustion control enabled by a free piston engine (FPE) and shown its benefits on both engine thermal efficiency and emissions by implementing various piston trajectories. In order to realize the HCCI trajectory-based combustion control in practical applications, a control-oriented model with sufficient chemical kinetics information has to be developed. In this paper, such a model is proposed and its performance, in terms of computational speed and model fidelity, is compared to three existing models: a simplified model using a one-step global reaction, a reduced-order model using Jones–Lindstedt mechanism, and a complex physics-based model including detailed chemical reaction mechanisms. A unique phase separation method is proposed to significantly reduce the computational time and guarantee the prediction accuracy simultaneously. In addition, the paper also shows that the high fidelity of the proposed model is sustained at multiple working conditions, including different air-fuel ratios (AFR), various compression ratios (CR), and distinct piston motion patterns between the two end positions. Finally, an example is presented showing how the control-oriented model enables real-time optimization of the HCCI combustion phasing by varying the trajectories. The simulation results show that the combustion phasing can be adjusted quickly as desired, which further demonstrates the effectiveness of the piston trajectory-based combustion control.

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Figures

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Fig. 3

Piston trajectories with different CR (top) and Ω (bottom)

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Fig. 2

Description of FPE piston motions

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Fig. 4

Phase separation within an engine cycle

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Fig. 1

Interaction between chemical kinetics and gas dynamics

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Fig. 11

Relative error of SOC timing from the two models at various CRs and different AFRs

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Fig. 12

Comparison of NOx production from the two models at various CRs and different AFRs

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Fig. 10

Relative error of peak temperature from the two models at various CRs and different AFRs

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Fig. 8

Comparison of temperature profiles from four models (AFR = 2, CR = 31, and Ω = 1)

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Fig. 9

Comparison of NOx production from the two models (AFR = 2, CR = 31, and Ω = 1)

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Fig. 5

Comparison between the combustion and motoring processes along the same piston trajectories

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Fig. 6

CH4 and CO2 species concentration profiles during the combustion process

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Fig. 7

NO, N2O, and NO2 species concentration and temperature profiles during the combustion process

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Fig. 13

Relative error of peak temperature from the two models at various Ωs and different AFRs

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Fig. 14

Relative error of SOC timing from the two models at various Ωs and different AFRs

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Fig. 15

Comparison of NOx production from the two models at various Ωs and different AFRs

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Fig. 16

Block diagram of the feedback loop searching the optimal piston trajectory with desired combustion phasing

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Fig. 17

Searching process for the optimal piston trajectory (AFR = 2, CR = 31)

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Fig. 18

Searching process of the optimal piston trajectories during the transient operations (various CRs and AFRs)

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