Abstract
Pump-controlled hydraulic circuits offer an energy-efficient solution for many applications. They combine the high power to weight ratio of hydraulic technology with the ease of control of electric technology. Pump-controlled circuits for double-rod cylinders are well developed as compared to those of single-rod cylinders. In spite of many initiatives, certain common pump-controlled single-rod cylinder solutions present stability issues during specific modes of operation. Common examples of the solutions are circuits that utilize pilot-operated check valves and circuits that use shuttle valves. In these circuits, velocity oscillations have been reported during actuator retraction at low assistive loads. In this paper, we study the area on the load-velocity graph of the available circuits where oscillatory behavior is experienced. We then propose a solution that shifts this critical zone towards lower loading values. This in turn reduces system response oscillations. Shifting the critical zone is accomplished by utilizing two charge pressures and asymmetric flow compensating valves. The concept is evaluated via simulations and experiments. Our results clearly show the enhanced performance of the circuits incorporating the proposed solution.
Highlights
Valve-controlled hydraulic systems possess a high power to weight ratio, fast response, and high stability under variable loading conditions
A new approach to deal with the undesirable velocity oscillations of certain classes
A new approach to deal with the undesirable velocity oscillations of certain classes of pump-controlled hydraulic circuits for single-rod actuators is proposed
Summary
Valve-controlled hydraulic systems possess a high power to weight ratio, fast response, and high stability under variable loading conditions. Oscillations of pump-controlled closed circuits for single-rod actuators is proposed This concept paper, new concept to improve theloading performance and reduce the reported is based In on this shifting thea critical zone towards lower values. Such an action reducessystem the adverse oscillations of pump-controlled closed circuits for single-rod actuators is proposed. The proposed concept is applied to circuits that utilize either based on shifting the critical zone towards lower loading values Such an action reduces the adverse pilot-operated check valves or shuttle valves. Simulations and experimental evaluations show the enhanced performance of the proposed approach
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