油圧システムのパワーマッチ制御に関する基礎的研究 : 射出成型機モデルに基づくパワーマッチ制御

抄録

Power-match control of hydraulic power systems means to continuously control the output power of the hydraulic pump so as to match the power of the load actuator. In the previous two reports of this study, we investigated the dynamic performance of pressure-match control and flow-rate-match control, employing an electrohydraulic power-match system driven by the differential-PWM method. The results showed that the system could be well controlled by each method. This system differs from the conventional type in that each control variable of pressure, flow rate or power of the load actuator can be controlled without using any control valves such as a load sensing valve or a flow control valve. In this report, a control algorithm for power-match control is developed and its applicability is tested in physical models of an injection molding machine. The performance of the applied system is investigated by experiment and computer simulation. It is verified that the system has good control performance.