ENERGY EFFICIENCY OF THREE-CHAMBER CYLINDER WITH DIGITAL VALVE SYSTEM
Keywords:digital cylinder, multi-chamber cylinder, energy efficiency
Commonly used hydraulic cylinders have a piston and a piston rod. The piston divides the inside of the cylinder in two chambers and pressures which affect how the piston generates the linear motion. Use of distributed valve system enables several control modes in a system of this type because different control edges can be controlled independently. These control modes can be used for decreasing energy consumption and improving controllability. The traditional hydraulic cylinder has only a limited number of control modes, but by utilizing a multi-chamber cylinder the number of control modes can be increased. In this paper, a three-chamber cylinder is studied using measurements and simulations. The control of the cylinder is presented and measurements are done in a 1-DOF boom mock-up to show the operation of the system in practice. A simulation model is built to investigate further the energy saving capability of the system. The studies show that losses can be significantly reduced by replacing traditional cylinder drives with multi-chamber cylinders.
Ding, F. 2004. Single rod equal area double acting
hydraulic cylinder capable of balancing weight.
China. Pat. CN1,526,960.
Habibi, S. and Goldenberg, A. 2000. Design of a New
High-Performance Electro Hydraulic Actuator.
IEEE/ASME Transaction on Mechatronics, Vol. 5,
No. 2, pp. 158-164.
Huova, M. and Laamanen, A. 2009. Control of Three-
Chamber Cylinder with Digital Valve System. The
Second Workshop on Digital Fluid Power. Linz,
Jansson, A. and Palmberg, J. - O.. 1990. Separate
Controls of Meter-in and Meter-out Orifices in Mobile
Hydraulic Systems. International Off-Highway
& Power Plant Congress and Exposition.
Linjama, M., Huova, M., Bostroem, P., Laamanen,
A., Siivonen, L., Morel, L., Waldén, M. and
Vilenius, M. 2007a. Design and implementation of
energy saving digital hydraulic control system.
Tenth Scandinavian International Conference on
Fluid Power. Tampere, Finland.Linjama, M., Vihtanen, H. - P., Sipola, A. and Vilenius,
M. 2009. Secondary controlled multi-chamber hydraulic
cylinder. The 11th Scandinavian International
Conference on Fluid Power. Linköping,
Linjama, M. and Vilenius, M. 2004. Digital hydraulic
control of a mobile machine joint actuator mockup.
Bath Workshop on Power Transmission and Motion
Control. Bath, UK.
Linjama, M. and Vilenius, M. 2007b. Digital Hydraulics
– Towards Perfect Valve Technology. Tenth
Scandinavian International Conference on Fluid
Power. Tampere, Finland.
Mouton, P. 1985. Multiple chamber coaxial hydraulic
jack and control system therefor. U.S. Pat.
Pfaff, J. 2005. Distributed Electro-Hydraulic Systems
for Telehandlers. The 50th National Conference on
Fluid Power. Las Vegas, USA.
Robinson, C. 1986. Fluid actuator for binary selection
of output force. U.S. Pat. 4,602,481.
Sampson, E., Habibi, S., Burton, R. and Chinniah,
Y. 2005. Model identification of the Electro Hydraulic
Actuator for small signal inputs. Bath Workshop
on Power Transmission and Motion Control.