Fuzzy-PID controller design of energy saving system in pipe isolation tool

As a new plugging technology, the intelligent plugging device in pipe is more and more used in the repair of oil and gas pipeline. But because of its limited energy source, it cannot be used in the plugging operation of long-distance pipeline. The hydraulic system for speed control and energy recovery is designed by using MATLAB/Simulink as the objective function of the controller. PID control and fuzzy PID control are added to hydraulic system, and the error is reduced to less than 3%. When the storage pressure is 3.80 MPa, the energy saving efficiency can reach 24.57%. The ratio increases with the increase of storage pressure. The results show that the system can accurately control the plugging speed, improve the energy utilization rate, and improve the capability of the plugging device.