Design and Implementation of Discrete Augmented Ziegler-Nichols PID Control
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Ziegler Nichols is oldest and widely accepted PID tuning method. Due to excessive overshoot in Ziegler-Nichol tuned PIDs (ZNPID), their performance is usually not acceptable for applications where small error tolerance band and precise control is required. To overcome this problem, we propose the gain updating method called as Augmented Ziegler-Nichols PID (AZNPID). We proposed an algorithm, which uses fourth order Runge-Kutta method to solve differential equations involved in PID, which eventually improves the peak overshoot of AZNPID compared to ZNPID. The proposed AZNPID is tested for third order and fourth order linear processes and its performance is compared with ZNPID.
KeywordsDiscrete PID controller Auto-tuned PID controller MATLAB
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