Study on dual pump Direct Drive Volume Control Electro-hydraulic Servo System

In order to solve the flow asymmetry of the differential cylinder caused by two-chamber area difference, the system sets the area of the two chambers to double the relationship. meanwhile, oil distribution can be adjusted by double pump. However, because the difference of two-cavity area is not a strict proportion relation and there are nonlinear effects such as cavitations and leaks, the speed is inconsistent when differential cylinder stretched and retrated, the performance of dynamic and static is poor, and the energy consumption is big. In Light of this, the system instead of servo valve to reduce energy consumption, and the displacement sensor and control system are added to adjust its dynamic performance. Further research on Direct Drive Volume Control Electro-hydraulic Servo System, and establish simulation model in AMESim. Simulation results show that the hydraulic system is stable and practical.