What devices require PID base loop optimization?
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There are several very meaningful figures regarding the PID algorithm. 1.97%. According to statistics, in process industries, the PID algorithm accounts for 97% of all control algorithms, thus holding an absolute dominant position. Only for certain problems where the PID algorithm is not effective are more complex control strategies introduced ； 250 million. There are 5 billion control loops based on the PID algorithm worldwide. The PID algorithm has been in use in the field of automatic control for a hundred years, and it remains the core and foundation of automatic control algorithms to this day ； 3.20%. If the control loop is not tuned in a scientific and systematic manner, only 20% of it exhibits excellent control performance ； 3.50%. Although many devices claim that their control loops have a high rate of automatic operation, in reality, if the control loops are not tuned in a scientific and systematic manner, the actual rate of automatic operation for such a device is usually only around 50% ； The characteristics that need to be adjusted for the control loop of a device include the following: 1) There is no detailed list of the device’s control loops, along with blind optimism that stems from a lack of digitalization and quantification ； 2) There is a list of detailed control circuits for the control devices, but the actual utilization rate of automatic control is low ； 3) Personnel who are not familiar with the PID tuning method are responsible for the tuning of control loops ； 4) Number of people with the common misconception: believing that manual methods are safer and more stable than automated ones ； 5) The operator ensures the performance of the control loop by limiting its output ； 6) The control circuit’s regulating valve is severely worn and prone to failures ； 7) Operators need to perform operations frequently, the workload is high, and the device generates many alarms as well as numerous abnormal conditions. What about the device you are in charge of? Welcome to follow the official account “Hukan PID” for communication.
Following Teacher Feng’s logic, we can conclude that PID needs to be optimized. The premise for such optimization is to maximize the efficiency of the device; it is a systematic approach in which the parameters must constrain one another. Those responsible for the optimization process must be aware of these principles, and the objectives must be clear. In fact, this approach is equivalent to an optimized combination of optimal control and PID. ;P
This understanding is profound and thorough, with sufficient depth. From a control perspective alone, PID tuning is not sufficient!