For more than 70 years, proportional-integral-derivative (PID) control has reigned as the industrial standard, and for good reason: it’s simple, fast, versatile, flexible, and such a sensible design that the underlying algorithm hasn’t changed one bit in all these years.
Today, more than 99% of all single regulatory loops are configured for PID, and until recently, most engineers and instrumentation specialists considered the alternatives too complex and CPU-expensive for widespread use.