Advanced Design of Variable Compression Ratio Engine with Dual Piston Mechanism

Ishikawa, S.; Kadota, M.; Yoshida, Kazuo; Takahashi, Katsuyuki; Kawajiri, S.

doi:10.4271/2009-01-1046

Cited by 18 publications

(4 citation statements)

References 5 publications

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“…   r r r r (8) or, equivalently as    r r r r (9) The x and y components of Equation ( 9) can be written respectively as…”

Section: Dimensional Synthesis Using Displacement Equationsmentioning

confidence: 99%

“…In addition to the above, the variable compression ratio (VCR) engine technology has been considered as a method for improving fuel efficiency and reducing pollutants [2][3][4][5]. Various approaches have been suggested for the variation of the compression ratio, which include moving the crankshaft axis or the cylinder head, varying the combustion chamber volume or the piston deck height, and modifying the connecting rod geometry [6][7][8][9][10]. Numerous VCR engine mechanisms have been proposed [11][12][13], and their kinematic structures have been identified [14].…”

Section: Introductionmentioning

confidence: 99%

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Kinematic Conceptual Design of In-Line Four-Cylinder Variable Compression Ratio Engine Mechanisms Considering Vertical Second Harmonic Acceleration

Kwak

Shim

2020

Applied Sciences

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In the in-line four-cylinder engine, it is well known that the shaking force is due to the vertical second harmonic acceleration components of the pistons. This paper proposes a kinematic conceptual design method to determine the kinematic structure of a feasible in-line four-cylinder variable compression ratio (VCR) engine and its dimensions that would yield a lower vertical second harmonic acceleration at joints. Through type and dimensional synthesis, candidate VCR engine mechanisms are chosen and their dimensions satisfying design specifications are determined. Based on the analysis of the vertical second harmonic acceleration components at the joints, a feasible mechanism for an in-line four-cylinder VCR engine is selected. Then, the method finds the dimensions that yield a nearly minimized sum of the vertical second harmonic acceleration at each joint by adjusting the link lengths within specified tolerances. For validation, the result is compared with that of a constrained optimization using MATLAB. The proposed method would be useful at the conceptual design stage of multi-link multi-cylinder VCR and variable-stroke engine mechanisms where the second harmonic acceleration is an important design factor in the automotive industrial applications.

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“…   r r r r (8) or, equivalently as    r r r r (9) The x and y components of Equation ( 9) can be written respectively as…”

Section: Dimensional Synthesis Using Displacement Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Kinematic Conceptual Design of In-Line Four-Cylinder Variable Compression Ratio Engine Mechanisms Considering Vertical Second Harmonic Acceleration

Kwak

Shim

2020

Applied Sciences

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“…The specifications of the 1.2 L engine are given in Table 1. In traditional single-piston engine architectures, VCR capability is often limited to a limited discrete number of piston adjustment mechanisms [4]. This crank phasing method in an opposed-piston architecture enables continuously adjustable CR by leveraging already proven cam phaser technologies.…”

Section: Overview Of Pinnacle's Engine Technologymentioning

confidence: 99%

High-Performance Computing and Analysis-Led Development of High Efficiency Dilute Opposed Piston Gasoline Engine

Banerjee¹,

Naber²,

Willcox³

et al. 2018

Journal of Engineering for Gas Turbines and Power

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Pinnacle is developing a multicylinder 1.2 L gasoline engine for automotive applications using high-performance computing (HPC) and analysis methods. Pinnacle and Oak Ridge National Laboratory executed large-scale multidimensional combustion analyses at the Oak Ridge Leadership Computing Facility to thoroughly explore the design space. These HPC-led investigations show high fuel efficiency (∼46% gross indicated efficiency) may be achieved by operating with extremely high charge dilution levels of exhaust gas recirculation (EGR) at a light load key drive cycle condition (2000 RPM, 3 bar brake mean effective pressure (BMEP)), while simultaneously attaining high levels of fuel conversion efficiency and low NOx emissions. In this extremely dilute environment, the flame propagation event is supported by turbulence and bulk in-cylinder charge motion brought about by modulation of inlet port flow. This arrangement produces a load and speed adjustable amalgamation of swirl and counter-rotating tumble which provides the turbulence required to support stable low-temperature combustion. At higher load conditions, the engine may operate at more traditional combustion modes to generate competitive power. In this paper, the numerical results from these HPC simulations are presented. Further HPC simulations and test validations are underway and will be reported in future publications.

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“…Um motor VCR (Variable Compression Ratio) de dois pistões no qual guias foram utilizadas para garantir resistência mecânica é apresentado por Ishikawa et al (2009). As guias têm duas vantagens: minimizam o tamanho do motor; e possibilitam um menor consumo de energia durante a etapa de compressão.…”

Section: Revisão Bibliográficaunclassified

Análise cinemática e dinâmica de mecanismos de motores de taxa de compressão variável

Cassiani¹,

Bittencourt²

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pela paciência, dedicação ao meu aprendizado e orientação técnica e pessoal ao longo deste projeto. À minha família, minha irmã Thaísa e especialmente aos meus pais Ronaldo e Silvia pelo apoio durante todo o tempo de graduação e mestrado. Agradeço pelos ensinamentos fundamentais em todas as etapas de minha vida. Aos meus amigos que sofreram e cresceram profissionalmente comigo, e compartilharam momentos de alegria nesses últimos anos. Aos colegas do Laboratório de Simulação Computacional do DPM, Fabiano Bargos, Rodrigo Augusto, Guilherme Neves, Bruno Salles e Felipe Furlan pela ajuda e companheirismo. À ThyssenKrupp Metalúrgica Campo Limpo LTDA, representada por Luís Antônio Fonseca Galli e Sergio Gradella Villalva, pela oportunidade e acompanhamento ao longo do projeto. v "Se o conhecimento pode criar problemas, não é através da ignorância que podemos solucioná-los."

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Advanced Design of Variable Compression Ratio Engine with Dual Piston Mechanism

Cited by 18 publications

References 5 publications

Kinematic Conceptual Design of In-Line Four-Cylinder Variable Compression Ratio Engine Mechanisms Considering Vertical Second Harmonic Acceleration

Kinematic Conceptual Design of In-Line Four-Cylinder Variable Compression Ratio Engine Mechanisms Considering Vertical Second Harmonic Acceleration

High-Performance Computing and Analysis-Led Development of High Efficiency Dilute Opposed Piston Gasoline Engine

Análise cinemática e dinâmica de mecanismos de motores de taxa de compressão variável

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