Shuang Peng
School of Mechanical&Mechatronic Engineering, Wuhan University of Technology, Wuhan, China
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http://dx.doi.org/10.3384/ecp17144172Published in: Proceedings of 15:th Scandinavian International Conference on Fluid Power, June 7-9, 2017, Linköping, Sweden
Linköping Electronic Conference Proceedings 144:16, p. 172-177
Published: 2017-12-20
ISBN: 978-91-7685-369-6
ISSN: 1650-3686 (print), 1650-3740 (online)
During past decades digital hydraulic technology has become the new trend in hydraulic area due to less consumed power, better controllability and larger tolerance of contaminations. In some digital hydraulic systems, PWM controller is applied to regulate the system flowrate. Thus pressure pulses and switching power loss resulted in by high frequent switching becomes the challenge of digital hydraulics. In this work, it aims to develop a control system where the digital valve always switches off at the moment when the value of the flowrate through the valve is around zero. In this paper a Zero-Flowrate-Swiching (ZFS) control system is presented in a application of a typical 2-valve digital hydraulic system. Operating principles and mathematical models are presented in the paper. According to the simulation results, the system with ZFS controller consumes 14.7% switching power loss compared to that of a Hard- Switching (HS) control system. This gives a bright sight view that ZFS control method can be a potential solution for pressure pulses and switching power loss resulted by high frequent switching in digital hydraulic systems.
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