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Power and fuel economy optimizations of gasoline engines using hydraulic variable valve actuation system

Author

Listed:
  • Li, Yangtao
  • Khajepour, Amir
  • Devaud, Cécile
  • Liu, Kaimin

Abstract

The hydraulic variable valve actuation (HVVA) system can provide greater freedoms to the engine valve motions than most of the traditional cam-based valve train systems do. By considering the characteristics of the HVVA system, the strategies of putting its outstanding flexibilities into use for further improving the performances of gasoline engines with respect to power and fuel economy are developed in this research. A new GT-suite HVVA engine model is proposed which is able to realize the interdependencies of the HVVA system and the engine. In addition, the model is calibrated by experimental data and the proposed genetic algorithm (GA) optimization schemes are carried out for optimizing the engine outputs at full engine load and fuel economy at partial engine load. A potential average improvement of 10.4% on the engine outputs at full load over the entire operating speed range of the test engine is noticed from implementing the optimized HVVA valve motions. Moreover, the advanced GA algorithm for fuel economy optimization ensures the GA optimizer could maintain its proper functionality while non-linear constraints are taken into considerations. The late exhaust valve closure (LEVC) and early intake valve closure (EIVC) strategies are adopted at the same time for granting the engine an internal exhaust gas recirculation (IEGR) feature and together evolved into the HVVA strategy for fulfilling the partial engine loads without throttling. By conducting the advanced GA optimizations with the proposed HVVA strategy for partial engine load operations, the resulted break specific fuel consumption (BSFC) of the HVVA engine could be brought down by 13.1% on average with a maximum of 15.8% over its working speed range at the exemplary 7Nm load point comparing to those of the original test engine.

Suggested Citation

  • Li, Yangtao & Khajepour, Amir & Devaud, Cécile & Liu, Kaimin, 2017. "Power and fuel economy optimizations of gasoline engines using hydraulic variable valve actuation system," Applied Energy, Elsevier, vol. 206(C), pages 577-593.
    • Handle: RePEc:eee:appene:v:206:y:2017:i:c:p:577-593
    DOI: 10.1016/j.apenergy.2017.08.208
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    References listed on IDEAS

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    Cited by:

    1. Zhou, Xianjie & Chen, Zheng & Zou, Peng & Liu, Jingping & Duan, Xiongbo & Qin, Tao & Zhang, Shiheng & Shen, Dazi, 2020. "Combustion and energy balance analysis of an unthrottled gasoline engine equipped with innovative variable valvetrain," Applied Energy, Elsevier, vol. 268(C).
    2. Tripathy, Srinibas & Das, Abhimanyu & Sahu, Balram & Srivastava, Dhananjay Kumar, 2020. "Electro-pneumatic variable valve actuation system for camless engine: Part I-development and characterization," Energy, Elsevier, vol. 193(C).
    3. Li, Yangtao & Khajepour, Amir & Devaud, Cécile, 2018. "Realization of variable Otto-Atkinson cycle using variable timing hydraulic actuated valve train for performance and efficiency improvements in unthrottled gasoline engines," Applied Energy, Elsevier, vol. 222(C), pages 199-215.
    4. Pauras Sawant & Michael Warstler & Saiful Bari, 2018. "Exhaust Tuning of an Internal Combustion Engine by the Combined Effects of Variable Exhaust Pipe Diameter and an Exhaust Valve Timing System," Energies, MDPI, vol. 11(6), pages 1-16, June.
    5. Longxin Jiang & Liang Liu & Xiaowei Peng & Zhaoping Xu, 2020. "Design and Analysis of a Fully Variable Valve Actuation System," Energies, MDPI, vol. 13(23), pages 1-16, December.
    6. Teodosio, Luigi & Pirrello, Dino & Berni, Fabio & De Bellis, Vincenzo & Lanzafame, Rosario & D'Adamo, Alessandro, 2018. "Impact of intake valve strategies on fuel consumption and knock tendency of a spark ignition engine," Applied Energy, Elsevier, vol. 216(C), pages 91-104.

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