Fuzzy Control of Power Matching for Hydraulic Rotatory Drilling-rig Based on Rotation Speed Feedback

Based on the energy-saving demanding for hydraulic rotatory drilling-rig by changeable load condition, the method of rotation speed feedback load limit control matching was proposed and the power matching between engine and variable displacement pump was achieved by using test feedback of rotation speed deviation induced by load, adjusting the displacement of the variable displacement pump, changing absorption torque of pump and keeping the engine output rotation speed within an ideal energy-saving rotation speed range. The proposed online real-time technique which adjusts the PID parameters by means of fuzzy self-adaptive algorithm was studied to realize the best efficiency matching by improving the adjusted performance of the pump in various work status and adaption of system to load variation. The perfect condition with the optimum efficiency of power matching is shown to be true by experiment on a hydraulic rotatory drilling-rig.