Kinematic design and analysis of a four-bar linkage-type continuously variable valve actuation mechanism

Qu, Xiaozhen; Kim, Dojoong

doi:10.1016/j.mechmachtheory.2012.07.006

Cited by 9 publications

(7 citation statements)

References 15 publications

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“…Now, many mechanical valve mechanisms are being used in engines, namely, Honda's Variable Valve Timing and Lift Electronic Control (VTEC), Mitsubishi Innovative Valve timing Electronic Control system (MIVEC), Toyota's Variable Valve Timing with intelligence (VVT-i), and Porsche's VarioCam [ 12 , 13 ]. Nevertheless, the discontinuous change of valve timing offered by the above mechanical valve mechanisms does not support continuous adjustment of valve timing.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Hydraulic Pulsation Features of Intelligent Variable Valve System for Auto Energy Saving

Chen

Liu

2022

Computational Intelligence and Neuroscience

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The electrohydraulic valve system can realize continuous variable valve timing and lift using the flexibility of liquid. However, the existing electrohydraulic valve systems usually rely on a high-speed solenoid valve to control the on and off states of the hydraulic circuit, which pushes up the system cost. This paper introduces a continuous hydraulic variable valve timing and lift system with adjustable volume (CVVTL). Unlike the other electrohydraulic valve systems, the CVVTL does not need a high-frequency servo valve to control each valve but adjusts the valve timing and lift by controlling the system volume. However, the maximum operating speed of hydraulic variable valve systems is limited by the inherent pressure fluctuation. To relax the limit, the authors further studied the pressure fluctuation features of the CVVTL system under various conditions and summarized the harms of the fluctuation. After identifying the causes of pressure fluctuation of the CVVTL system, the authors came up with systematic countermeasures to system pressure fluctuation.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Hydraulic Pulsation Features of Intelligent Variable Valve System for Auto Energy Saving

Chen

Liu

2022

Computational Intelligence and Neuroscience

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“…Such an approach is also used in earlier studies. 10,11 Qu and Kim 10 state that while commercial CAD software may be used to calculate kinematic motion conversion, it is almost impossible to use it in cam profile design, because similar CAD modeling must be performed several hundred or thousand times. Equally, accurate analysis of contact geometry is also limited in CAD software.…”

Section: Computer-aided Kinematic Analysis Of the Vivl Mechanismmentioning

confidence: 99%

“…It is a usual or classical kinematic approach, which mainly deals with the establishment of geometrical parameters and transmission functions as discussed in earlier works. 10,[17][18][19] Other approaches use the Euler-Savary theory 20 and the Gruebler and Harisberger theorem, 18 according to which there is a correspondence between a cam mechanism with rotational follower and a four-bar mechanism for a certain number of positions. The same result may be stated for the case of translational follower.…”

Section: System Description Protoype Enginesmentioning

confidence: 99%

“…8 As these are mechanisms meant to ensure variability of the engine valve train, they are obviously more complicated than the conventional valve train mechanisms; hence, before adopting a VVA system in mass production, several issues have to be solved such as packaging, dynamic performance, power consumption, reliability, repeatability and cost effectiveness. 1,[9][10][11] The subject of the current study is an original continuously ViVL mechanism. 12,13 Its positive effects on the energetic performance of a spark ignition engine were presented in Clenci et al 14,15 This study first presents the analytical synthesis of the ViVL mechanism, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…As these are mechanisms meant to ensure variability of the engine valve train, they are obviously more complicated than the conventional valve train mechanisms; hence, before adopting a VVA system in mass production, several issues have to be solved such as packaging, dynamic performance, power consumption, reliability, repeatability and cost effectiveness. 1,9–11…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analytical synthesis and computer-aided kinematic analysis of a continuously variable valve lift mechanism

Clenci

Hara

Stănescu

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper presents an original continuously variable intake valve lift mechanism designed for the automotive spark ignition engines. The paper first presents the analytical kinematic synthesis of the variable intake valve lift mechanism, which consists in finding out the required intake cam profile starting from an imposed intake valve lift law. Then, by using the obtained cam profile, a computer-aided kinematic analysis of the variable intake valve lift mechanism is performed using commercial CAD software. The accuracy of the motion conversion performed with CAD software is validated by checking the degree of correlation between the resulted intake valve lift law and the imposed law used when performing the analytical synthesis. The goals of the kinematic analysis are first to find the partial laws of the intake valve lift, corresponding to the engine part loads and second, to find the transfer functions of the elements used to command the mechanism, i.e. the dependency between these elements and the intake valve lift law. The designed variable intake valve lift mechanism is successfully operated on an engine prototype and proved its energetic improvement potential.

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Design of a variable valve hydraulic lift system for diesel engine

Gui²,

et al. 2015

J Mech Sci Technol

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Kinematic design and analysis of a four-bar linkage-type continuously variable valve actuation mechanism

Cited by 9 publications

References 15 publications

Experimental Study on Hydraulic Pulsation Features of Intelligent Variable Valve System for Auto Energy Saving

Experimental Study on Hydraulic Pulsation Features of Intelligent Variable Valve System for Auto Energy Saving

Analytical synthesis and computer-aided kinematic analysis of a continuously variable valve lift mechanism

Design of a variable valve hydraulic lift system for diesel engine

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