Abstract
Valve-controlled hydraulic actuation systems are favored in many applications due to their fast response, high power-to-weight ratio, and stability under variable working conditions. Efficiency, however, is the main disadvantage of these systems. Pump-controlled hydraulic actuations, on the other hand, eliminate energy losses in throttling valves and require less cooling. Furthermore, they inherently hold the ability to recover energy from assistive loads. Pump-controlled circuits for double-rod cylinders are well developed and are implemented in many industrial applications, including aviation. However, pump-controlled circuits for single-rod cylinders usually experience performance issues during specific modes of operation. In this paper, a new circuit using two valves to compensate for the differential flow of single-rod actuators is proposed. The compensating valves provide limited throttling over the differential flow only in critical operating regions to alleviate unwanted velocity oscillations. They have a minimum throttling effect in all other operating regions to preserve the efficiency. The new circuit has been experimentally evaluated. Its performance has also been compared with three other previously proposed circuits. The proposed circuit displays an improved performance, besides being capable of energy regeneration.
Highlights
IntroductionValve-controlled hydraulic actuation systems (VCHAs) are essential in many modern high-power applications (>5 kW) including aviation, mining, agricultural, and construction equipment [1,2]
Valve-controlled hydraulic actuation systems (VCHAs) are essential in many modern high-power applications (>5 kW) including aviation, mining, agricultural, and construction equipment [1,2].They possess fast response, high power-to-weight ratio, and show stability under variable working conditions
Pressure planes for the circuits with pilot-operated check valves, closed-center shuttle valve, open-center shuttle valve, and the newly proposed limited throttling valves were used for performance evaluation
Summary
Valve-controlled hydraulic actuation systems (VCHAs) are essential in many modern high-power applications (>5 kW) including aviation, mining, agricultural, and construction equipment [1,2]. Rahmfeld and Ivantysynova [17] introduced a closed circuit to control a single-rod cylinder It comprises a variable displacement piston pump and two pilot-operated check valves (POCVs) to compensate for the differential flow of the cylinder. Proposed a 3/3 open-center shuttle valve (OC-SHV) to compensate for the cylinder differential flow, as well as improve the stability through the incorporated leakage in the valve They reported that their design worked best at specific cylinder velocities. A new design for a pump-controlled hydraulic circuit for single-rod cylinders is introduced This solution applies the same limited throttling concept introduced in [5]; it utilizes less number of components in a novel way that reduces system complexity. Experiments examining the performance of the new design are presented that include comparison with three other previously proposed circuits
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