Development of a camless engine valve actuator system for robust engine valve timing control

Title
Development of a camless engine valve actuator system for robust engine valve timing control
Author(s)
남강현Seibum Choi[Seibum Choi]
Keywords
Adverse effect; Camless engine; CEVA; Cost effective; Cylinder temperatures; Engine operations; Hydraulic actuation; Low costs; Low temperature conditions; Low temperatures; Oil viscosity; Operating condition; Pollutant emission; Position sensors; Robust engines; Temperature changes; Temperature variation; Valve actuators; Valve opening; Valve timing; Variable valve timing control; Controllers; Hydraulic actuators; Identification (control systems); Engines
Issue Date
201210
Citation
International Journal of Vehicle Systems Modelling and Testing, v.7, no.4, pp.372 - 389
Abstract
In this paper, a camless engine valve actuator (CEVA) system for robust engine valve timing control is presented. A particularly challenging control obstacle, shown in hydraulic actuation system for camless engine valve actuators, is the sluggish response of valve actuators at a cold operating condition. This is mainly due to the characteristics of oil viscosity with respect to temperature changes. At a low temperature condition, CEVA shows the very sluggish response. The retarded valve opening and closing timing, by CEVA's slow response at low temperature, causes an increase in pollutant emission and cylinder temperature during engine operation. In order to avoid these adverse effects by retarded timing, the new valve timing controller is proposed to control opening timing and closing timing, which is robust against temperature variations. A proposed valve timing controller is for guaranteeing the valve timing repeatability without using expensive position sensors. Experimental results indicate the feasibility of a fully variable valve timing control and CEVA system which can be constructed at a low cost. ? 2012 Inderscience Enterprises Ltd.
URI
http://hdl.handle.net/YU.REPOSITORY/27082http://dx.doi.org/10.1504/IJVSMT.2012.049429
ISSN
1745-6436
Appears in Collections:
공과대학 > 기계공학부 > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE