---
title: "Purpose of PID tuning; computer control benefits"
subject: "Embedded System"
chapter: 7
key: "semester_6/embedded_system:pid-tuning-purpose-benefits"
source: https://www.bctengineer.com/q/semester_6/embedded_system/pid-tuning-purpose-benefits
site: BCT Engineering
---

# Purpose of PID tuning; computer control benefits

Embedded System · Chapter 7: Control System

- Asked in: 2070 Magh, 4 marks
- Video: [PID Controller Explained](https://www.youtube.com/watch?v=fv6dLTEvl74) — RealPars
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_6/embedded_system/pid-tuning-purpose-benefits
- Whole chapter: https://www.bctengineer.com/md/semester_6/embedded_system/chapter-7

## Question

What is the purpose of PID tuning, and what are the benefits of computer based control implementations?

## Short answer

The purpose is to choose gains for fast, stable response with low overshoot and zero steady-state error. Computer-based control offers flexibility via software, accuracy without drift, ability to implement complex algorithms, multiple loops, logging, diagnostics, and lower cost/size.

## Answer

#### Purpose of PID tuning

Tuning selects the gains Kp, Ki and Kd so that the controlled output reaches the set-point quickly, with small overshoot, short settling time and no steady-state error, and stays stable despite disturbances. Poorly tuned gains give sluggish response, large oscillation or instability.

#### Benefits of computer (digital) based control

- **Flexibility:** control law and gains are changed in software without changing hardware.
- **Accuracy and repeatability:** digital arithmetic does not drift like analog components.
- **Complex algorithms:** adaptive control, non-linear control, filtering and gain scheduling are possible.
- **Multiple loops** can be handled by one processor, and it can add logging, display, alarms and communication.
- **Lower cost and size** in volume, and easy self-tuning and diagnostics.

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. What is the purpose of tuning?
   A. Maximise gain
   B. Eliminate the plant
   C. Fast response with small overshoot, short settling and zero steady error
   D. Remove all feedback
   Answer: C. Gains must meet requirements and stay stable. (Key point: Purpose)

2. What may poorly tuned gains cause?
   A. Zero error
   B. Sluggish response, oscillation or instability
   C. Lower cost
   D. Faster hardware
   Answer: B. Both too low and too high gains cause problems. (Key point: Poor tuning)

3. Why is digital control flexible?
   A. Control law and gains change in software
   B. Needs hardware rewiring
   C. Fixed algorithms
   D. Analog drift
   Answer: A. No hardware change. (Key point: Flexibility)

4. Why is digital control repeatable?
   A. Uses larger components
   B. Has no ADC
   C. Ignores noise
   D. Digital arithmetic does not drift like analog components
   Answer: D. Results identical on every unit. (Key point: Accuracy)

## Related in Embedded System

- [PID tuning and computer control issues](https://www.bctengineer.com/question.md?key=semester_6%2Fembedded_system%3Apid-tuning-practical-issues) — Embedded System, chapter 7
- [Benefits of computer based control](https://www.bctengineer.com/question.md?key=semester_6%2Fembedded_system%3Acomputer-based-control-benefits) — Embedded System, chapter 7
- [PID control operation with block diagram](https://www.bctengineer.com/question.md?key=semester_6%2Fembedded_system%3Apid-operation-block-diagram) — Embedded System, chapter 7, asked 4×

## Related in other subjects

- [Pattern based design and benefits](https://www.bctengineer.com/question.md?key=semester_6%2Fobject_oriented_analysis_and_design%3Apattern-based-design-benefits) — Object Oriented Analysis and Design, chapter 3
- [PID control of speed and torque](https://www.bctengineer.com/question.md?key=semester_7%2Futilization_of_electrical_energy%3Apid-control-speed-torque-motor) — Utilization of Electrical Energy, chapter 3, asked 2×