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Actuators 2017, 6(1), 10; doi:10.3390/act6010010

Design, Implementation and Evaluation of a Pump-Controlled Circuit for Single Rod Actuators

Fluid Power & Telerobotics Research Laboratory, Department of Mechanical Engineering, University of Manitoba, Winnipeg, MB R3T5V6, Canada
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Academic Editor: Delbert Tesar
Received: 20 November 2016 / Revised: 14 February 2017 / Accepted: 14 February 2017 / Published: 20 February 2017
(This article belongs to the Special Issue Hydraulic Actuators)
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Abstract

Pump-controlled hydraulic circuits are more efficient than valve-controlled circuits, as they eliminate the energy losses due to flow throttling in valves and require less cooling effort. Presently existing pump-controlled solutions for single rod cylinders encounter an undesirable performance during certain operating conditions. This paper investigates the performance issues in common pump-controlled circuits for the single rod actuators. Detailed analysis is conducted that identifies these regions in a load-velocity plane and the factors affecting them. The findings are validated by experimental results. A new design is then proposed that employs a limited throttling valve alongside two pilot operated check valves for differential flow compensation to improve the performance. The valve is of the flow control type and is chosen to have a throttling effect over critical regions; it has the least throttling over other operating regions, thus maintaining efficiency. Experimental work demonstrates improved performance in a full operating range of the actuator as compared to a circuit that uses only the pilot-operated check valves. This circuit is energy efficient and capable of recuperating energy. View Full-Text
Keywords: pump-controlled actuation; single rod actuator; counterbalance valve; efficiency pump-controlled actuation; single rod actuator; counterbalance valve; efficiency
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Imam, A.; Rafiq, M.; Jalayeri, E.; Sepehri, N. Design, Implementation and Evaluation of a Pump-Controlled Circuit for Single Rod Actuators. Actuators 2017, 6, 10.

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