Mobile Working Hydraulic System Dynamics

Author: Mikael Axin
Editor: Linköping University Electronic Press
ISBN: 9176859711
File Size: 33,48 MB
Format: PDF, ePub, Mobi
Read: 4012
Download

This thesis deals with innovative working hydraulic systems for mobile machines. Flow control systems are studied as an alternative to load sensing. The fundamental difference is that the pump is controlled based on the operator’s command signals rather than feedback signals from the loads. This control approach enables higher energy efficiency and there is no load pressure feedback causing stability issues. Experimental results show a reduced pump pressure margin and energy saving potential for a wheel loader application. The damping contribution from the inlet and outlet orifice in directional valves is studied. Design rules are developed and verified by experiments. A novel system architecture is proposed where flow control, load sensing and open-centre are merged into a generalized system description. The proposed system is configurable and the operator can realize the characteristics of any of the standard systems without compromising energy efficiency. This can be done non-discretely on-the-fly. Experiments show that it is possible to avoid unnecessary energy losses while improving system response and increasing stability margins compared to load sensing. Static and dynamic differences between different control modes are also demonstrated experimentally.
Agricultural Load-sensing Hydraulic Systems
Language: en
Pages: 15
Authors: H. Richard Jarboe
Categories: Agricultural machinery
Type: BOOK - Published: 1983 - Publisher:

Books about Agricultural Load-sensing Hydraulic Systems
Mobile Working Hydraulic System Dynamics
Language: en
Pages: 85
Authors: Mikael Axin
Categories: Agricultural machinery
Type: BOOK - Published: 2015-09-07 - Publisher: Linköping University Electronic Press

This thesis deals with innovative working hydraulic systems for mobile machines. Flow control systems are studied as an alternative to load sensing. The fundamental difference is that the pump is controlled based on the operator’s command signals rather than feedback signals from the loads. This control approach enables higher energy
Automotive Technology: A Systems Approach
Language: en
Pages: 1696
Authors: Jack Erjavec, Rob Thompson
Categories: Technology & Engineering
Type: BOOK - Published: 2014-02-28 - Publisher: Cengage Learning

AUTOMOTIVE TECHNOLOGY: A SYSTEMS APPROACH - the leading authority on automotive theory, service, and repair - has been thoroughly updated to provide accurate, current information on the latest technology, industry trends, and state-of-the-art tools and techniques. This comprehensive text covers the full range of basic topics outlined by ASE, including
Tech Manual for Erjavec's Automotive Technology: A Systems Approach
Language: en
Pages: 784
Authors: Jack Erjavec
Categories: Technology & Engineering
Type: BOOK - Published: 2009-01-02 - Publisher: Cengage Learning

Offers students opportunities to strengthen their comprehension of key concepts and to develop their hands-on, practical shop experience. Each chapter includes Concept Activities and Job Sheets, many of which are directly correlated to specific NATEF tasks. Service manual report sheets, case studies, review questions are also included to offer a
Modeling and Experimental Evaluation of a Load-sensing and Pressure Compensated Hydraulic System
Language: en
Pages:
Authors: Jack Erjavec
Categories: Technology & Engineering
Type: BOOK - Published: 2003 - Publisher:

Heavy load equipment, such as tractors, shovels, cranes, airplanes, etc, often employ fluid power (i.e. hydraulic) systems to control their loads by way of valve adjustment in a pump-valve control configuration. Most of these systems have low energy efficiency as a consequence of pressure losses across throttle valves. Much of