Aspects in the Synthesis of a Variable Compression Ratio Mechanism

Mănescu, Bogdan; Dragomir, Ionuţ; Stănescu, Nicolae–Doru; Nicolae, Petre-Marian; Clenci, Adrian; Popa, Dinel

doi:10.1088/1757-899x/252/1/012075

Cited by 6 publications

(2 citation statements)

References 9 publications

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“…In this context, Variable compression ratio engines (VCR) make a contribution, in which the very last function of the Top dead center TDC piston is adjusted to optimize the compression ratio to increase thermodynamic performance, particularly at part load, and finally reduce gasoline consumption and CO2 emissions. Several VCR configurations presently exist [1][2][3][4][5], such as the gear-based crank mechanism engine (GBCM) with variable compression ratio (VCR_MCE-5) [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…) Code availability: no code(4) This study is based on the geometric and kinematic modeling of the gear-based crank mechanism engine (GBCM). The main contribution of this paper based on projective computational methods and mechanism theory laws, to which a parametric study has allowed a conclusion on the geometrical and kinematic behaviors of the moving links (The paper can be used for large industrial applications such as automotive, and mechanical industries.…”

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confidence: 99%

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Kinematics modeling of the gear-based crank mechanism engine regardless of the compressions ratio variations

Sakhraoui,

Saggar,

Ayari

et al. 2023

Preprint

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In this work, geometric and kinematic modeling of the gear-based crank mechanism engine (GBCM) was performed. To this aim, a mechanical approach based on projective computational methods and mechanism theory laws is applied, to which a parametric study has allowed a conclusion on the geometrical and kinematic behaviors of the moving links. The study concluded that the kinematic quantities at connecting rod head are one-half of those at the piston top head. The extrinsic behavior like the stroke of the connecting rod head is twice the crank radius and the piston kinematic are identical to the conventional engine with the same crankshaft ratio regardless of the compression ratio and any gear wheel radius. Hence, all the extrinsic kinematic properties of a classic crankshaft mechanism of the fixed compression ratio engine remain valid for a gear-based crank mechanism engine and can be used for dynamic calculation purposes.

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