Welcome to Journal of Automotive Safety and Energy,
汽车安全与节能学报

Journal Of Automotive Safety And Energy ›› 2016, Vol. 07 ›› Issue (01): 100-107.DOI: 10.3969/j.issn.1674-8484.2016.01.013

• Automotive Energy Efficiency & Environment Protection • Previous Articles     Next Articles

Development of a Robust Controller for Electro-hydraulic Variable Valve Actuation System

HUANG Chao 1, HUANG Yanjun 2, ZHANG Jian 1, Amir KHAJEPOUR 1,2   

  1. 1. College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China;
    2. University of Waterloo, Waterloo N2L3G1, Canada
  • Received:2015-11-01 Online:2016-03-25 Published:2016-04-05

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Abstract:

Hydraulic oil viscosity has significant influence on the performance of hydraulic variable valve
actuation (VVA) systems. The optimal valve timing and lift should be quickly reached under any operating
condition to improve the efficiency of internal combustion engines. A mathematical model was built for an
electro-hydraulic VVA using AMESim software and then validated to study the influence of hydraulic oil viscosity
on the VVA performances. An average model of the VVA was developed based on the energy conservation
concept. A sliding mode controller (SMC) was designed by using the average model in Matlab/Simulink. The
simulation results show that the proposed SMC can adapt the valve lift by adjusting hydraulic pump speed. The
SMC controller can improve the working aceuracy by 9.3%. Therefore, this SMC can eliminate the disturbances
caused by the variation of hydraulic oil viscosity.

Key words: internal combustion engine (ICE), variable valve actuation (VVA), viscosity of hydraulic oil, average model, sliding mode controller (SMC)