Variable Compression Ratio Engines

Cassiani, Maurilio De Bortoli; Bittencourt, Marco L.; Galli, Luis Antonio Fonseca; Villalva, Sergio Gradella

doi:10.4271/2009-36-0245

Cited by 8 publications

(6 citation statements)

References 12 publications

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“…To combat knock at higher loads and poor efficiency at low loading scenarios, various solutions have been proposed and developed to vary the CR of ICE according to engine loading. Many experimental engines have been built and tested for many decades but as of 2019 the automobile manufacturer Nissan has managed to develop the 1st multi-link VCR turbocharged production engine (De Bortoli Cassiani et al 2009;Hiyoshi et al 2006;Hoeltgebaum et al 2016;Hiyoshi et al 2006).…”

Section: Variable Crmentioning

confidence: 99%

Comprehensive Review of Innovation in Piston Engine and Low Temperature Combustion Technologies

Allmägi,

Ilves,

Olt

2024

Transport

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Global transport today is mainly powered by the Internal Combustion Engine (ICE) and throughout its century and a half of development it has become considerably more efficient and cleaner. Future prospects of the ICE rely on the scientific work conducted today to keep this trend of higher efficiency and cleaner emissions in new engines going. The aim of this article is to give a comprehensive review of development directions in novel piston engine designs, which seek to overcome the drawbacks of the ubiquitous 4-stroke piston engine. One of the directions of development is devoted to improving the mechanisms and the general layout of the piston engine to reduce losses within the engine. Research teams working with alternative engine work cycles like the 5- and 6-stroke engine and technologies for extracting waste heat seek to reduce thermal losses while novel layouts of valve trains and crank assemblies claim to significantly improve the mechanical and Volumetric Efficiency (VE) of piston engines. These novel ideas include camless or Variable Valve Action (VVA) and engines with Variable Compression Ratio (VCR) or opposed pistons. One alternative approach could also be to totally redesign the reciprocating mechanism by replacing the piston with some other device or mechanism. Additional scientific work is investigating Low Temperature Combustion (LTC) technologies such as Turbulent Jet Ignition (TJI) and Homogeneous Charge Compression Ignition (HCCI) and its derivatives like Premixed Charge Compression Ignition (PCCI) and Reactivity Controlled Compression Ignition (RCCI) that have shown improvements in thermal and fuel conversion efficiency while also significantly reducing harmful emissions. These combustion strategies also open the path to alternative fuels. The contemporary work in the combustion engine fields of research entail technical solutions from the past that have received a modern approach or are a completely novel idea. Nonetheless, all research teams work with the common goal to make the piston engine a highly efficient and environmentally friendly device that will continue to power our transport and industry for years to come. For this, solutions must be found to overcome the mechanical limitations of the traditional layout of the piston engine. Similarly various improvements in combustion technology are needed that implement state of the art technology to improve combustion characteristics and reduce harmful emissions.

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Section: Variable Crmentioning

confidence: 99%

Comprehensive Review of Innovation in Piston Engine and Low Temperature Combustion Technologies

Allmägi,

Ilves,

Olt

2024

Transport

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“…By solving Equations (8) and (10) simultaneously with Equations (9) and (13), all possible combinations of non-negative integer values of l i can be determined.…”

Section: Number Synthesis Of Kinematic Chainsmentioning

confidence: 99%

“…Among the literature on the kinematic structures of VCR engines [6][7][8][9][10][11][12][13][14][15][16][17][18], Freudenstein and Maki [6] applied a systematic search procedure for the type synthesis of one-degree-of-freedom (DOF) variable-stroke IC engine mechanisms and enumerated 39 kinematic structures with six and eight links, and then determined three potentially acceptable mechanisms by evaluating the enumerated structures. H. N. Pouliot et al [7] developed a nine-link variable-displacement engine and obtained data on power, fuel consumption, and emission with engine dynamometer tests.…”

Section: Introductionmentioning

confidence: 99%

“…A variable displacement engine with the capability to vary stroke length and compression ratio independent of one another was designed and analyzed by Rosso et al [12]. Cassiani et al [13] analyzed the kinematic and dynamic model of the Saab Variable Compression (SVC) engine mechanism. Kwak et al [14] proposed a kinematic conceptual design procedure for in-line four-cylinder VCR engine mechanisms considering vertical second harmonic acceleration.…”

Section: Introductionmentioning

confidence: 99%

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Type Synthesis of Variable Compression Ratio Engine Mechanisms

Shim

Kwak

et al. 2020

Applied Sciences

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Type synthesis of two-degrees-of-freedom (DOF) planar mechanisms has been carried out using graph theory to determine the possible kinematic structures of variable compression ratio (VCR) engine mechanisms with two to three independent loops, and has resulted in the structures of 87 mechanisms satisfying search specification. By applying evaluation criteria to the enumerated mechanisms, the kinematic structures of three mechanisms are selected as suitable VCR engine mechanisms and verified by analysis results. In this research, VCR engine mechanisms with revolute joints and only one prismatic joint are enumerated, and the basic method to determine the VCR engine mechanisms with higher pairs is discussed. The procedure used in this research can be utilized to determine the kinematic structures of desired mechanisms and the results can be used as an atlas of two-DOF adjustable slider-crank mechanisms.

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“…Similar results were found by [211] under dierent driving cycles. A comparison of dierent VCR systems was presented in [212] via simulation, showing the potential of VCR technologies.…”

Section: Variable Compression Ratiomentioning

confidence: 99%

Study of different Exhaust Gas Recirculation Configurations and their Impact on Turbocharged Spark Ignition Engines

Pitarch Berná

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Joaquín de la Morena Borja. The PhD-Candidate position of last signatory of the organization in the publications is justied by the CMT-Motores Térmicos protocol of signing, based on seniority. These publications are the result of the dierent researching activities developed during the course of the candidate's doctorate and part of the publications needed in order to fulll it. For the sake of uent reading and to maintain a coherent structure, these publications are not explicitly cited every time that a part of it is used for this document, despite gures, discusions and explanations may be directly extracted from the publications.

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Variable Compression Ratio Engines

Cited by 8 publications

References 12 publications

Comprehensive Review of Innovation in Piston Engine and Low Temperature Combustion Technologies

Comprehensive Review of Innovation in Piston Engine and Low Temperature Combustion Technologies

Type Synthesis of Variable Compression Ratio Engine Mechanisms

Study of different Exhaust Gas Recirculation Configurations and their Impact on Turbocharged Spark Ignition Engines

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