Mechanically Fully Variable Valvetrain and Cylinder Deactivation

Flierl, Rudolf; Lauer, Frederic

doi:10.1007/s38313-013-0042-3

Cited by 4 publications

(3 citation statements)

References 1 publication

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“…In these types of valvetrains, the valvetrain friction can be higher owing to the increased number of contact partners. The UniValve system showed the same level of friction as a conventional valvetrain for the same engine, in full lift in allcylinder mode [102]. This method is not suitable for rolling CDA because of the limited number of possible combinations of control shaft profiles.…”

Section: Fig 10 Switchable Rocker Arm (Left) and Univalve System (Right)mentioning

confidence: 94%

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Overview of the potential and limitations of cylinder deactivation

Fridrichová

Drápal

Vopařil

et al. 2021

Renewable and Sustainable Energy Reviews

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Section: Fig 10 Switchable Rocker Arm (Left) and Univalve System (Right)mentioning

confidence: 94%

“…It is necessary to implement CDA into the ECU, and there are usually only slight design changes in the valvetrain. An example is the UniValve system [102] shown in Fig. 10, which is a mechanically fully variable valvetrain system based on a plane cam mechanism.…”

Section: Fig 9 Movable Cam Sectionsmentioning

confidence: 99%

Overview of the potential and limitations of cylinder deactivation

Fridrichová

Drápal

Vopařil

et al. 2021

Renewable and Sustainable Energy Reviews

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“…Electromechanically controlled systems have slower responses but are simpler than hydraulic ones. They include: electro-mechanical roller follower [26], switchable rocker arm [6], movable cam sections [12], engine with skip cycle mechanism [17], and Variable Valve Actuation (VVA) [20,27].…”

mentioning

confidence: 99%

Feasibility and Performance Analysis of Cylinder Deactivation for a Heavy-Duty Compressed Natural Gas Engine

Misul,

Scopelliti,

Di Maio

et al. 2024

Energies

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The rising interest in the use of gaseous fuels, such as bio-methane and hydro-methane, in Heavy-Duty (HD) engines to reduce Greenhouse Gases pushed by the net-zero CO2 emissions roadmap, introduced the need for appropriate strategies in terms of fuel economy and emissions reduction. The present work hence aims at analysing the potential benefits derived from the application of the cylinder deactivation strategy on a six-cylinder HD Natural Gas Spark Ignition (SI) engine, typically employed in buses and trucks. The activity stems from an extensive experimental characterisation of the engine, which allowed for validating a related 1D model at several Steady-State conditions over the entire engine workplan and during dynamic phases, represented by the World Harmonized Transient Cycle (WHTC) homologation cycle. The validated model was exploited to assess the feasibility of the considered strategy, with specific attention to the engine working areas at partial load and monitoring the main performance parameters. Moreover, the introduction in the model of an additional pipeline and of valves actuated by a dedicated control logic, allowed for embedding the capability of using Exhaust Gas Recirculation (EGR). In the identified operating zones, the EGR strategy has shown significant benefits in terms of fuel consumption, with a reduction of up to 10%. Simultaneously, an appreciable increase in the exhaust gas temperature was detected, which may eventually contribute to enhance the Three-Way Catalyst (TWC) conversion efficiency. Considering that few efforts are to be found in the literature but for the application of the cylinder deactivation strategy to Light-Duty or conventionally fuelled vehicles, the present work lays the foundation for a possible application of such technology in Natural Gas Heavy-Duty engines, providing important insights to maximise the efficiency of the entire system.

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Design and analysis of skip fire valve strategies based on electromagnetic valve train

Chang

Liu

et al. 2018

Applied Thermal Engineering

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Mechanically Fully Variable Valvetrain and Cylinder Deactivation

Cited by 4 publications

References 1 publication

Overview of the potential and limitations of cylinder deactivation

Overview of the potential and limitations of cylinder deactivation

Feasibility and Performance Analysis of Cylinder Deactivation for a Heavy-Duty Compressed Natural Gas Engine

Design and analysis of skip fire valve strategies based on electromagnetic valve train

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