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Methods to achieve HCCI/CAI combustion at idle operation in a 4VVAS gasoline engine

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Listed:
  • Chen, Tao
  • Xie, Hui
  • Li, Le
  • Zhang, Lianfang
  • Wang, Xinyan
  • Zhao, Hua

Abstract

Homogeneous Charge Compression Ignition (HCCI) combustion, also known as controlled auto-ignition (CAI), has been shown to reduce substantially NOX emissions and fuel consumption in gasoline engines. However, it is still confronted with the problem of its limited operation range. One of the focuses of the current HCCI combustion research is to expand its low load limit to the idle operation. The main obstacle in developing HCCI idle combustion is to avoid misfire due to high dilution and low charge temperature. In this work, research was carried out on a single cylinder engine equipped with fully variable valve lifts and timing devices in order to identify the appropriate engine control strategies to extend the HCCI low load limit. Negative valve overlap (NVO) with port fuel injection and direct gasoline injection were investigated for achieving the appropriate environment for auto-ignition at idle and the optimal tradeoff between the combustion stability and fuel consumption. The result shows that the early intake valve opening (EIVO) strategy is most conductive to produce stable combustion at low load conditions. HCCI operation range was successfully extended to idle condition by employing EIVO strategy at the stoichiometric air–fuel ratio. Good combustion stability can be achieved at 800 RPM, 85kPa NIMEP condition. In addition, the fuel consumption could be improved further by introducing direct injection together with the EIVO strategy. The analyses demonstrate that the idle HCCI operation was enabled by the stratified residual gas and temperature distribution in the cylinder associated with the EIVO strategy. Furthermore, fuel-reforming processes from the direct gasoline injection into the hot residual gas could reduce dependence on the stratification at low loads.

Suggested Citation

  • Chen, Tao & Xie, Hui & Li, Le & Zhang, Lianfang & Wang, Xinyan & Zhao, Hua, 2014. "Methods to achieve HCCI/CAI combustion at idle operation in a 4VVAS gasoline engine," Applied Energy, Elsevier, vol. 116(C), pages 41-51.
  • Handle: RePEc:eee:appene:v:116:y:2014:i:c:p:41-51
    DOI: 10.1016/j.apenergy.2013.09.044
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    References listed on IDEAS

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    1. Olesky, Laura Manofsky & Martz, Jason B. & Lavoie, George A. & Vavra, Jiri & Assanis, Dennis N. & Babajimopoulos, Aristotelis, 2013. "The effects of spark timing, unburned gas temperature, and negative valve overlap on the rates of stoichiometric spark assisted compression ignition combustion," Applied Energy, Elsevier, vol. 105(C), pages 407-417.
    2. Li, Nan & Xie, Hui & Chen, Tao & Li, Le & Zhao, Hua, 2013. "The effects of intake backflow on in-cylinder situation and auto ignition in a gasoline controlled auto ignition engine," Applied Energy, Elsevier, vol. 101(C), pages 756-764.
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    Cited by:

    1. Komninos, N.P., 2015. "The effect of thermal stratification on HCCI combustion: A numerical investigation," Applied Energy, Elsevier, vol. 139(C), pages 291-302.
    2. Chung, Jinhwa & Lee, Seunghyeon & An, Hyunsoo & Song, Soonho & Chun, Kwang Min, 2015. "Rapid-compression machine studies on two-stage ignition characteristics of hydrocarbon autoignition and an investigation of new gasoline surrogates," Energy, Elsevier, vol. 93(P2), pages 1505-1514.
    3. Zhou, Lei & Song, Yuntong & Hua, Jianxiong & Liu, Fengnian & Wei, Haiqiao, 2020. "Effects of miller cycle strategies on combustion characteristics and knock resistance in a spark assisted compression ignition (SACI) engine," Energy, Elsevier, vol. 206(C).
    4. Song, Kang & Wang, Xinyan & Xie, Hui, 2018. "Trade-off on fuel economy, knock, and combustion stability for a stratified flame-ignited gasoline engine," Applied Energy, Elsevier, vol. 220(C), pages 437-446.
    5. Zhou, Lei & Hua, Jianxiong & Liu, Feng & Liu, Fengnian & Feng, Dengquan & Wei, Haiqiao, 2018. "Effect of internal exhaust gas recirculation on the combustion characteristics of gasoline compression ignition engine under low to idle conditions," Energy, Elsevier, vol. 164(C), pages 306-315.

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    Keywords

    HCCI/CAI combustion; Idle; VVA; GDI;
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