Notes: Closed Loop and Open Loop Control System

Key Points

• Types of Control Systems:
  • Closed Loop Control System
  • Open Loop Control System

Closed Loop Control System

• Operates using feedback.
• Measures the output of a system and uses it to improve the input.
• Example: A washing machine that adjusts itself according to water level and dirtiness of clothes during washing time.

Open Loop Control System

• Does not use feedback.
• Once set, operates in the same way until manually changed.
• Example: A simple washing machine that operates on a timer regardless of whether the clothes are clean or not.

Comparison

• Closed Loop:

  • More efficient and accurate
  • Greater complexity
  • More expensive

• Open Loop:

  • Simple and less complex
  • Cheaper
  • Less accurate

Applications and Examples

• Closed Loop is used in advanced devices like smart refrigerators and automotive systems.
• Open Loop is used in simple devices like old washing machines and basic televisions.

Conclusion

• Selection of a control system depends on requirements and budget.
• Closed loop systems provide more accuracy and control, whereas open loop systems are simple and less costly.