Abstract: A new type of energy saving electro hydraulic control system for multiple actuator compounded control is put forward. Switchmode hydraulic power supplies are applied in the driving and control of the hydraulic motors with high inertia loads, a semi close loop circuit is constructed and its output torque could adapt the load automatically. Energy converting efficiency is increased considerably. Based on these, correspondent plus frequency modulated velocity control method is put forward. Theoretical analyses and experiments show that its energy saving effect, together with its anti-disturbance ability is good, but its output velocity is fluctuant slightly.

Key words: High inertia loads, Multiple actuators compounded control, Plus frequency modulation, Switchmode hydraulic power supply, Velocity control