Reconfigurability of engines: A kinematic approach to variable compression ratio engines

Hoeltgebaum, Thiago; Simoni, Roberto; Martins, Daniel

doi:10.1016/j.mechmachtheory.2015.10.003

Cited by 33 publications

(24 citation statements)

References 4 publications

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“…Varying the compression ratio in a running engine is a new technology that has been developed called variable compression ratio, which radically improves the fuel consumption without impairing engine performance at certain regions of the engine map. VCR engines have been categorized into several classes in [25].…”

Section: Variable Compression Ratiomentioning

confidence: 99%

Zero-dimensional modelling of a four-cylinder turbocharged diesel engine with variable compression ratio and its effects on emissions

Khan

Gül

2019

SN Appl. Sci.

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With emission legislation becoming ever more stringent, declining fossil resources and an increase in greenhouse effect caused by CO 2 emissions, manufacturers are exploring new ways to match the emissions regulations without compromising on the performance of the engine. This study included development of zero-dimensional model of a 2.0 L turbocharged diesel engine and then study the effects of changing its compression ratio in the numerical model. This paper gave a framework in determining the effect of compression ratios in different operational conditions of the engine. Implementation of variable compression ratio technology on a numerical model proved to be very cost-effective, time saving and validated the fact that numerical models can be used to study different parameters of the engines during the development stage. The main effect of an increase in compression ratio, was found to be as expected, a decrease in brake specific fuel consumption and an increase in thermal efficiency with a greater impact at low rpm-low load regions. Assuming, that the variable compression ratio technology can be utilized in the engine, this work found the best combination of compression ratios around the engine map, giving a best fit of trade-offs between the emissions and performance of the engine. This study also validates the fact that variable compression ratio technology, if implemented in the engine could not only reduce emissions of the engine but can be given as an option to the end-user to switch to more economic fuel consumption values during idling or cruising at long distant journeys.

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Section: Variable Compression Ratiomentioning

confidence: 99%

Zero-dimensional modelling of a four-cylinder turbocharged diesel engine with variable compression ratio and its effects on emissions

Khan

Gül

2019

SN Appl. Sci.

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“…A continuación, considerando el trabajo realizado por Hoeltgebaum [10], se describe brevemente la estructura y la cinemática de mecanismos que permiten mejorar la eficiencia a partir de la ejecución del ciclo de Atkinson.…”

Section: Implementación Del Ciclo Atkinsonunclassified

Ciclo Atkinson: una alternativa para mejorar la eficiencia en motores de combustión interna

Henao-Castañeda¹,

Piedrahita²,

Monroy-Jaramillo³

2018

revuin

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Los ciclos expandidos, como el desarrollado por Atkinson en motores de combustión interna (MCI), se utilizan para aprovechar mejor el combustible y aumentar la eficiencia térmica. En el presente artículo se presentan, desde el punto de vista de la mecánica de maquinaria y la teoría de grafos, las estructuras cinemáticas de Watt y Stephenson, que, mediante arreglos multieslabón, permiten recrear el mecanismo presentado por James Atkinson. A través de un análisis cinemático, se evidencian los problemas relacionados con las velocidades y aceleraciones del pistón que presentan estas estructuras cinemáticas y que comprometen su producción masiva. No obstante, se retoma el ciclo de Atkinson como posibilidad constructiva actualmente, cuando se dispone de avanzadas herramientas de hardware electrónico y de control.

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“…In China, the limit of fuel consumption will be 5 L per 100 km up to 2020 [3]. In the United States and Japan, passenger vehicles will have to achieve 23 km/L on average from 2025 [4]. Additionally, in Europe, the CO 2 emission limit will be 60 g per kilometer from 2025 [5].…”

Section: Introductionmentioning

confidence: 99%

Study on the Dynamic Characteristics of a Hydraulic Continuous Variable Compression Ratio System

et al. 2019

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Variable compression ratio (VCR) technology has long been recognized as a method for improving the engine performance, efficiency, and fuel economy of automobiles, with reduced emissions. In this paper, a novel hydraulic continuous VCR system based on the principle of an adjustable hydraulic volume is introduced. The continuous variable compression ratio of the VCR system is realized by the hydraulic system controlling the rotation of the eccentric pin to change the positions of the top dead center (TDC) and the bottom dead center (BDC). The construction of the mathematical model and simulation model of the VCR system is also presented in this paper. The piston motion characteristics, flow characteristics, and pressure characteristics of the hydraulic system of the VCR system at different engine speeds and adjustment quantities are studied by simulation in this paper. The simulation results show that the VCR system has a fast response and good dynamic characteristics, and can achieve continuous adjustment of the compression ratio.

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Reconfigurability of engines: A kinematic approach to variable compression ratio engines

Cited by 33 publications

References 4 publications

Zero-dimensional modelling of a four-cylinder turbocharged diesel engine with variable compression ratio and its effects on emissions

Zero-dimensional modelling of a four-cylinder turbocharged diesel engine with variable compression ratio and its effects on emissions

Ciclo Atkinson: una alternativa para mejorar la eficiencia en motores de combustión interna

Study on the Dynamic Characteristics of a Hydraulic Continuous Variable Compression Ratio System

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