Abstract: The multiloop control system in German Bosch Rexroth servo pump was studied, including electric control and hydraulic drive. This technique was applied to the injection molding machine, and an improved scheme was proposed. Through the application of advanced electric control and hydraulic transmission, more stable performance, more reliable operation, and convenient application were realized.

Key words: injection molding machine, servo pump, singleloop hydraulic system, multiloop hydraulic system, master and salve control, master and salve turning control