نتایج جستجو برای: variable intake valve actuation
تعداد نتایج: 474871 فیلتر نتایج به سال:
In-cylinder exhaust gas recirculation (EGR) stratification, generally achieved by supplying EGR asymmetrically into intake ports on a four-valve diesel engine, is sensitive to trapped exhaust gas in the intake manifold and intake ports that is caused by the continuous supply of EGR during the valve-close periods of the intake valves. The subject of this study is to evaluate the distribution of ...
the depth control systems used in iranian tractors are mechanical and they produce variable tillage depth in uneven field surface. in this research a rotary type electronic control valve was designed and constructed. by using this valve, electro-hydraulic tillage depth control system was developed and installed on the tractor. the control system was composed of: a depth sensor, a programmable l...
A new, active, normally-open blocking microvalve that uses the thermal expansion of a sealed, thin paraffin patch for actuation has been fabricated and tested. The entire structure is batch-fabricated by surface micromachining the actuator and channel materials on top of a single substrate. The paraffin actuated microvalves are suitable for applications requiring many devices on a single die, l...
This paper deals with a new planar parallel mechanism with variable actuation and its kinetostatic performance. A drawback of parallel mechanisms is the non homogeneity of kinetostatic performance within their workspace. The common approach to solve this problem is the introduction of actuation redundancy, that involves force control algorithms. Another approach, highlighted in this paper, is t...
In this paper, the control of the force due to the interaction with the environment of a robotic manipulator with relevant and adjustable joint stiffness is addressed. It is assumed that the interaction force is not directly measurable and a controller able to estimate this force is proposed. Also the problem of controlling simultaneously both the position and the stiffness trajectory in the ro...
nowadays, due to increasing the complexity of ic engines, calibration task becomes more severe and the need to use surrogate models for investigating of the engine behavior arises. accordingly, many black box modeling approaches have been used in this context among which network based models are of the most powerful approaches thanks to their flexible structures. in this paper four network base...
The dynamic response of a fluidic actuator is investigated on the basis numerical simulations. With this membrane excited to oscillate by means an electrorheological valve. For purpose solid and fluid domains are coupled. Furthermore, constitutive equation coupled electric field. discussed example variable stiffness membrane. Actuators type offer potential delay transition boundary layer.
An electromagnetic variable valve (EMVV) system can significantly reduce pumping loss and discharge of the engine by enabling timing lift. However, seat easily produces a larger impact collision with cylinder head because fast seating velocity, greatly decreasing life. Therefore, in this paper, buffer (VSB) is designed to solve problem large impact. Firstly, scheme an EMVV embedded proposed, mo...
The field of soft actuators is dominated by elastomers that experience mechanical deformations in response to external stimuli. In this context, magnetic stimuli attract considerable interest because their easy application, tunability, fast response, remote actuation, and safe penetration biological environments. Since very recently, research interests the are being redirected towards hydrogels...
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