Abstract
In industry, pump-controlled hydraulic systems are generally considered energy efficient but are not accurate due to their inherent characteristics such as low response frequencies, thus pump control hydraulic systems have been traditionally applied in situations that require high power but limited accuracy. Besides, for the conventional pump-controlled cylinder systems, especially open-circuit systems, the cylinder vibration and cavitation may result due to the negative load when the cylinder moves with a high deceleration trajectory. Therefore, it is difficult to simultaneously keep the advantages of energy-saving and high motion tracking accuracy. This paper proposes a novel control strategy for a servo motor-pump and proportional valves combination control system. The cylinder is directly driven by a variable speed pump to give full play to the advantage of energy-saving by pump control. The meter-out pressure is controlled by proportional valves to provide the required resistance for motion tracking. A pressure regulation method is proposed, consisting of an optimized meter-out pressure planning and a pressure tracking controller. Both the pump controller and the meter-out pressure controller use the adaptive robust control (ARC) algorithm to achieve high motion control accuracy.
Published Version
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