Open-loop systems handle changes in operating conditions without any automatic feedback or self-regulation. Specifically:
- In an open-loop system, the output does not influence or affect the control action. The system simply follows an input command or preset control setting regardless of what happens at the output.
- As a result, changes or disturbances in external conditions do not cause the output to adjust automatically. If the operating conditions vary, the output remains the same unless a human operator or an external agent manually changes the input or controller settings.
- For example, in processes like drying or washing machines using open-loop control, the timing or control sequence is fixed beforehand. If conditions such as load or environment change, the system continues its operation unchanged unless manually adjusted (e.g., increasing drying time).
- This means open-loop systems are best suited for slow-changing processes or where changes in load or conditions happen gradually enough that manual tuning or intervention can compensate over time.
- In some cases—such as engine fuel control in open-loop mode—the system uses pre-programmed maps or tables to determine output (fuel delivery) based solely on set parameters, without sensor feedback. This makes the system simpler but less adaptable to real-time changes.
In summary, open-loop systems do not automatically respond to changes in operating conditions. Handling such changes depends on manual adjustments or predetermined control settings rather than internal feedback mechanisms. This lack of adaptability is a fundamental limitation of open-loop control.
Original article by NenPower, If reposted, please credit the source: https://nenpower.com/blog/how-do-open-loop-systems-handle-changes-in-operating-conditions/
