0

Full Content is available to subscribers

Subscribe/Learn More  >

Hydraulic Needle Valve Actuator and Its Application to a Camless Engine

[+] Author Affiliations
William de Ojeda, Jorge Fernández

International Truck and Engine Corporation, Melrose Park, IL

Paper No. IMECE2003-43607, pp. 39-44; 6 pages
doi:10.1115/IMECE2003-43607
From:
  • ASME 2003 International Mechanical Engineering Congress and Exposition
  • Fluid Power Systems and Technology
  • Washington, DC, USA, November 15–21, 2003
  • Conference Sponsors: Fluid Power Systems and Technology Division
  • ISBN: 0-7918-3717-3 | eISBN: 0-7918-4663-6, 0-7918-4664-4, 0-7918-4665-2
  • Copyright © 2003 by ASME

abstract

The design and operation of a hydraulic actuator that can track precise trajectories under large accelerations and under heavy load conditions is presented. The actuator is based on a master and slave-piston arrangement and compensates for varying temperature and supply pressures without significant deterioration. A slave piston, capable of exercising a large force, tracks faithfully the motion of a needle or master spool. The actuator has been used to provide individual control over the intake and exhaust engine valves in a medium duty engine, replacing the mechanical camshaft. Simulation and test data shows the actuator to have exceptional tracking characteristics for viscosities between 0.02 and 1.5 Ns/m2, and pressures above 5MPa during warm operation. A linear motor is used to prescribe the needle motion. The low inertia of the needle and its electronic interface allows for a highly flexible electronically controlled valve system. The power consumption from the hydraulic and electrical systems is shown to be smaller than its mechanical counterpart.

Copyright © 2003 by ASME

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In