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Applying the multi-zone model in predicting the operating range of HCCI engines

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Abstract

In this paper, a multi-zone model is developed to predict the operating range of homogeneous charge compression ignition (HCCI) engines. The boundaries of the operating range were determined by knock (presented by ringing intensity), partial burn (presented by combustion efficiency), and cycle-to-cycle variations (presented by the sensitivity of indicated mean effective pressure to initial temperature). By simulating an HCCI engine fueled with iso-octane, the knock and cycle-to-cycle variations predicted by the model showed satisfactory agreement with measurements made under different initial temperatures and equivalence ratios; the operating range was also well reproduced by the model. Furthermore, the model was applied to predict the operating range of the HCCI engine under different engine speeds by varying the intake temperatures and equivalence ratios. The potential to extend the operating range of the HCCI engine through two strategies, i.e., variable compression ratio and intake pressure boosting, was then investigated. Results indicate that the ignition point can be efficiently controlled by varying the compression ratio. A low load range can be extended by increasing the intake temperature while reducing the compression ratio. Higher intake temperatures and lower compression ratios can also extend the high load range. Boosting intake pressure is helpful in controlling the combustion of the HCCI engine, resulting in an extended high load range.

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Authors and Affiliations

  1. School of Energy and Power Engineering, Dalian University of Technology, Dalian, 116024, China

    Ming Jia & Maozhao Xie

  2. School of Engineering and Design, University of Sussex, Brighton, BN1 9RH, UK

    Zhijun Peng

Authors
  1. Ming Jia
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  2. Maozhao Xie
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  3. Zhijun Peng
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Correspondence to Maozhao Xie.

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Jia, M., Xie, M. & Peng, Z. Applying the multi-zone model in predicting the operating range of HCCI engines. Front. Energy Power Eng. China 4, 414–423 (2010). https://doi.org/10.1007/s11708-010-0108-8

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  • DOI: https://doi.org/10.1007/s11708-010-0108-8

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