2014 Volume 45 Issue 1 Pages 1-7
In this study, an Active Charge Accumulator (ACA) is proposed as a new accumulator whose output pressure can be adjusted to N levels quickly. Because an ACA is a piston type accumulator which is divided into several oil chambers, the effective area of the oil chambers in the ACA can be changed by switching the valves at the oil chamber inlets. Therefore, the required one of N-levels output pressure can be obtained. In a system with N accumulators to provide N levels output pressure, an ACA can be used to replace the N accumulators. Experimental results verified that the efficiency of the valve-controlled hydraulic servo system using a 2-level pressure ACA is greatly improved, and the power consumption of the system is reduced when compared with a traditional valve-controlled hydraulic servo system.
