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汽车安全与节能学报

Journal of Automotive Safety and Energy ›› 2011, Vol. 2 ›› Issue (3): 257-262.DOI: 10.3969/j.issn.1674-8484.2011.03.012

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Intake performance of unthrottled gasoline engines based on fully variable valve systems

XIE Zongfa*1,2, QIN Lei1, LIU Yongtian3, WANG Zhiming2#br#   

  1. 1. School of Mechanical Engineering, Shandong University, Jinan 250061, China; 
    2. School of Energy and Power Engineering, Shandong University, Jinan 250061, China; 
    3. School of Mechanical and Electronic Engineering, Shandong Jianzhu University, Jinan 250101, China
  • Received:2011-07-11 Online:2011-09-27 Published:2011-10-13

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Abstract: For unthrottled gasoline engines, substitution of fully variable valve systems (FVVSs) for throttles is very important for energy saving and emission reduction. A displacement sensor was used to measure the valve lift and intake efficiency of FVVS with an intake flow-meter used to measure the air inflow of the unthrottled gasoline engines. The movement characteristics of the intake valve were analyzed according to the test results, with the adjustments of the intake air volume by FVVS being discussed. The results show that the fully variable valve system enables the maximum valve lift and opening duration to continuously vary in a large range, so the intake air inflow can be controlled though timing and early intake valve closing or late intake valve closing.

Key words: unthrottled gasoline engines, fully variable valve system (FVVS), test, valve lift, intake efficiency

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