Reconfigurability of Engines: A Kinematic Approach to Variable Compression Ratio Engines

Hoeltgebaum, Thiago; Simoni, Roberto; Martins, Daniel

doi:10.1007/978-3-319-23327-7_89

Cited by 7 publications

(5 citation statements)

References 4 publications

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“…• the driving "force" which generates the hinged engine's variability or reconfigurability as defined by Hoeltgebaum et al 19 is the pressure force itself; thus, the presented VCR engine is an intrinsic or passive automatic CR self-regulation system • because of the in-cylinder pressure continuous variation in time, at a certain load level maintained constant, there is a variable torque acting on the engine's upper block and, consequently, on the springs used to balance the tipping torque; therefore, an oscillating motion of the combustion chamber results, but as it was shown, its amplitude is small, so that for every stable operation, the volumetric CR may be considered constant. • the calculations showed a very low amplitude of the motions involved in self-regulating the CR between the minimum and maximum values; thus, the associated friction was neglected.…”

Section: Discussionmentioning

confidence: 99%

“…Over the time, many reviews were authored on the subject of the VCR engine (e.g., 14,[17][18][19][20][21] ) Equally, many others were focused on presenting specific VCR concepts or prototypes. 13,15,[22][23][24][25] Out of them, very few focused on the dynamic response of the VCR engine, i.e., on the response time of the CR adjustment automatic system, even though this is paramount for the PC road mobility, which means anything but steady operation.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the response time of a self-regulation variable compression ratio engine

Clenci

Hara

Stănescu

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Today, the greenhouse gas (GHG) emissions (specifically, CO2) represent the greatest challenge of the internal combustion (IC) engine and consequently, now, more than ever, the passenger car industry is looking for technologies meant to address this issue. Since CO2 emission is related to the combustion process occurring inside the engine, its reduction is inherently connected to lowering the fuel consumption, meaning that the only way to reduce it in the IC engine is to increase its overall efficiency. One solution to do this over the whole operating area is to fit the engine with a variable compression ratio (VCR) system, which may be advantageously combined with other enhancing-efficiency technologies. However, to avoid knocking and pre-ignition, such an engine should feature an adequate response time during the transition from the maximum compression ratio to the minimum one. Consequently, this paper describes a theoretical investigation on the kinematics and dynamics of a hinged VCR engine’s upper block tilting motion, aiming to show that this engine, as an automatic system with self-regulation of compression ratio, can respond adequately when the operating conditions change fast. This is paramount for the passenger car road mobility, which means anything but steady operation.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on the response time of a self-regulation variable compression ratio engine

Clenci

Hara

Stănescu

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

show abstract

“…The advances regarding reconfigurability are present in many areas such as reconfigurable mechanisms and robots, variable topology modeling, metamorphic mechanisms and robots, origami-inspired mechanisms and modular devices [24][25][26]. Engines is a recent area of application of the [18] reconfigurability in mechanisms, Hoeltgebaum et al [52][53][54] studied the reconfigurability of VCR engines and they discuss the potential for innovation in VCR engines regarding the reconfigurability.…”

Section: Discussion Of the Reconfigurabilitymentioning

confidence: 99%

“…As exposed in Sect. 2, there is a need to develop more efficient engines, which led companies to research reconfigurable engines, such as variable compression ratio (VCR) engines [52,53].…”

Section: M2-reconfigurable Atkinson Enginesmentioning

confidence: 99%

Structural analysis, survey and classification of kinematic chains for Atkinson cycle engines

Martins

Frank

Simas

et al. 2018

J Braz. Soc. Mech. Sci. Eng.

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This paper presents an Atkinson Cycle mechanisms classification. The proposed classification is based on mechanism theory, dividing the mechanisms into two main classes and eight subclasses. The reconfigurability of Atkinson Cycle mechanisms is discussed as well as the mechanism characteristics for each class. This classification was applied to the engines found in bibliography and patent survey. Both surveys were necessary to yield a complete state of the art, regarding not only academic but also technological advances. These surveys and the Atkinson Cycle engine classification expose the wide window of opportunities for engine development. The use of reconfigurable Atkinson Cycle engines can be a powerful tool to develop more efficient vehicles.

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“…To be able to increase the efficiency of an engine all effects of engine parameters should be known. Thus, many researchers have investigated the effects of these parameters mostly using variable compression engine (VCR) [2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Calculation and Optimizing of Brake Thermal Efficiency of Diesel Engines Based on Theoretical Diesel Cycle Parameters

Karaman

Yıldızhan

Özcanlı

et al. 2016

International Journal of Engineering Technologies IJET

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Abstract-In this study, a theoretical study has been evaluated in order to calculate and optimize diesel engine brake thermal efficiency values. In the study three main parameters which are compression ratio, ratio of specific heat and cut-off ratio, based on ideal diesel cycle were evaluated. Compression ratio, ratio of specific heats and cut-off ratios were chosen between the interval of; 12:1-24:1, 1,2-1,4 and 1,5-3,0, respectively. Theoretical study showed that compression ratio significantly affects the engine characteristics that calculated in this study. Experiments revealed that the higher compression ratio results with higher brake thermal efficiency (BTHE) and thus lower specific fuel consumption (SFC). The calculation study showed that increasing cut-off ratio caused to decrease of brake thermal efficiency. Also, study revealed that increment of ratio of specific heats improved brake thermal efficiency.

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Reconfigurability of Engines: A Kinematic Approach to Variable Compression Ratio Engines

Cited by 7 publications

References 4 publications

Investigation on the response time of a self-regulation variable compression ratio engine

Investigation on the response time of a self-regulation variable compression ratio engine

Structural analysis, survey and classification of kinematic chains for Atkinson cycle engines

Calculation and Optimizing of Brake Thermal Efficiency of Diesel Engines Based on Theoretical Diesel Cycle Parameters

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