Some investigations on fuzzy P + fuzzy I + fuzzy D controller for non-stationary process

  • Authors:

  • Vineet Kumar;B. C. Nakra;A. P. Mittal

  • Affiliations:

  • Division of Instrumentation and Control Engineering, Netaji Subhas Institute of Technology, Delhi University, New Delhi, India 110075;Department of Mechanical Engineering, Institute of Technology and Management University, Gurgaon, India 122017;Division of Instrumentation and Control Engineering, Netaji Subhas Institute of Technology, Delhi University, New Delhi, India 110075

  • Venue:
  • International Journal of Automation and Computing
  • Year:
  • 2012

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Abstract

The paper addresses the adaptive behaviour of parallel fuzzy proportional plus fuzzy integral plus fuzzy derivative (FP+FI+FD) controller. The parallel FP+FI+FD controller is actually a non-linear adaptive controller whose gain changes continuously with output of the process under control. Two non-stationary processes, whose characteristics change with time, are considered for simulation study. Simulation is performed using software LabVIEW驴. The set-point tracking response of parallel FP+FI+FD is compared with conventional parallel proportional plus integral plus derivative (PID) controller, tuned with the Ziegler-Nichols (Z-N) tuning technique. Simulation results show that conventional PID controller fails to track the set-point and becomes unstable as the process changes its characteristic with time. But the parallel FP+FI+FD controller shows considerably much better set-point tracking response and does not deviate from steady state. Also, a huge spike is observed in the output of PID controller as the reference set-point and process parameters are changed, while the FP+FI+FD controller gives spike free control signal.