نتایج جستجو برای: variable intake valve actuation

تعداد نتایج: 474871  

Journal: :British Journal of Anaesthesia 1974

2007
T. Leroy J. Chauvin N. Petit G. Corde

We address the control of the airpath of a turbocharged S.I. engine equipped with Variable Valve Timing actuators (VVT). Compared to standard configurations, the engine does not possess any external EGR (Exhaust Gas Recirculation) loop. Rather, VVT are used to produce internal EGR, providing similar beneficial effects in terms of emissions reduction. The airpath dynamics takes the form of a sin...

Journal: :Applied sciences 2022

Automotive manufacturers are showing an increasing preference for hybrid powertrains based on advanced gasoline engines. The most extended solution to improve fuel economy in these engines consists downsizing with direct injection, while turbocharging is required compensate the consequent power loss. However, associated different issues, such as compressor surge. It can appear during fast throt...

Journal: :journal of computational & applied research in mechanical engineering (jcarme) 2014
m. zamanian s. a. a. hosseini

this article studied static deflection, natural frequency and nonlinear vibration of a clamped-clamped microbeam under discontinues electrostatic actuation. the electrostatic actuation was induced by applying ac-dc voltage between the microbeam and electrode plate. in contrast to previous works, it was assumed that length of the electrode plate was smaller than that of the microbeam. in additio...

2008
Anna Pandolfi

We present a finite element model of polydimethylsiloxane (PDMS) fluidic microvaJves. A valve is fabricated by assembling two patterned layers in a two-channel crossed architecture. The valve closes as a consequence of the motion of the intertayer membrane. The membrane is deformed by the pressure of the actuation fluid, flowing in one of the two channels. By using a soft rubber material model,...

Journal: :Micromachines 2016
David Kinahan Marine Renou Dirk Kurzbuch Niamh A. Kilcawley Éanna Bailey Macdara T. Glynn Colette McDonagh Jens Ducrée

We report a new flow control method for centrifugal microfluidic systems; CO2 is released from on-board stored baking powder upon contact with an ancillary liquid. The elevated pressure generated drives the sample into a dead-end pneumatic chamber sealed by a dissolvable film (DF). This liquid incursion wets and dissolves the DF, thus opening the valve. The activation pressure of the DF valve c...

Journal: :Optics letters 2009
Mekala Krishnan Joonsik Park David Erickson

Optical methods for microfluidic flow manipulation offer a flexible, noncontact technique for both fluid actuation and valving. At present, however, such techniques are limited by their high laser power requirements, low achieved flow rates, or poor valve switching times. Here we demonstrate a microfluidic valving technique based on optothermorheological manipulation using a low-power 40 mW las...

Journal: :Lab on a chip 2015
Bhushan J Toley Jessica A Wang Mayuri Gupta Joshua R Buser Lisa K Lafleur Barry R Lutz Elain Fu Paul Yager

Failure to utilize valving and automation techniques has restricted the complexity of fluidic operations that can be performed in paper microfluidic devices. We developed a toolkit of paper microfluidic valves and methods for automatic valve actuation using movable paper strips and fluid-triggered expanding elements. To the best of our knowledge, this is the first functional demonstration of th...

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