A hybrid fuzzy-PI control model for constant-pressure automatic bit-feeding system of large-diameter shaft drilling rig

The automatic bit-feeding process is the key technique of the drilling technology. The performance of the automatic bit-feeding system affects directly the drilling efficiency, even the success of the entire shaft project. In order to satisfy the requirements of automatic bit-feeding, a control model combining fuzzy logic with proportional integral algorithm was proposed by analyzing the system operational modes. Applied to the winch control system of a shaft drilling machine, the control model solved the problem of time delay and nonlinearity of the automatic bit-feeding system. The hybrid fuzzy-PI control model borrows ideas from both fuzzy logic control and PID control, solves the problem that the precise mathematical model of the system is difficult to establish, and improves the adaptability and robustness of the system.