Episode 44 · Process Control
Process Control, Part 2: Feedback and PID in Depth
Part two of Process Control looks closely at the controller most plants depend on: PID. Proportional, integral and derivative action are developed through their effects on a loop, then connected to tuning history and practical methods. Dead-time compensation, operating modes and transitions show why a mathematically plausible setting is only part of the job. The episode closes with an operational checklist that brings the controller, process and human operator into one discussion.
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Inside this episode
- Recap and cold open: Monday morning
- Feedback: the idea that forgives ignorance
- Proportional: the spring
- Integral: the grudge
- Derivative: the look ahead
- The history: Minorsky, Ziegler and Nichols
- Lambda and IMC tuning: choosing the speed
- Tuning integrators, and the lung
- Cascade: a manager and a specialist
- Feedforward: seeing the punch coming
- Ratio control: the recipe
- Override and selectors: the bouncer
- Scan time: the strobe light
- Stiction: the valve that won't listen
- The sensor lies too
- Gain scheduling and the changing horse
- Robustness: how close to the cliff?
- Dead time compensation: the Smith predictor
- Modes, bumps, and the human in the loop
- The craft: a checklist
- Recap and what comes next
Production credits & AI disclosure
Scripts generated with Claude Opus. Synthetic narration generated with Edge TTS. Reviewed, listened to, and approved by Sankalp Thakur.