The demand of hydraulic parallel motion system of space rendezvous and docking simulator to its hydraulic system is high flow and high performance. To achieve good motion simulation results and meet the requirements of precision control, a method of self-tuning parameters fuzzy PID control of proportional water valve opening has been employed to control oil temperature, a method of online vacuum degassing in a sealed system has been used to increase oil effective bulk modulus, and a device has been developed to measure oil bulk modulus online. Experimental research has been carried out on the hydraulic driving system of comprehensive test bed for docking mechanism. The experimental results show that precise control of oil temperature has been achieved and bulk modulus of oil has been increased obviously.

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