A proportional-integral-derivative controller is a control loop feedback mechanism widely used in industrial control systems. A PID controller calculates an error value as the difference between a measured process variable and a desired setpoint. The controller attempts to minimize the error by adjusting the process through use of a manipulated variable.
The PID controller algorithm involves three separate constant parameters, and is accordingly sometimes called three-term control: the proportional, the integral and derivative values, denoted P, I, and D. Simply put, these values can be interpreted in terms of time: P depends on the present error, I on the accumulation of past errors, and D is a prediction of future errors, based on current rate of change. The weighted sum of these three actions is used to adjust the process via a control element such as the position of a control valve, a damper, or the power supplied to a heating element.
In the absence of knowledge of the underlying process, a PID controller has historically been considered to be the best controller.
Unionsfraktion stoppt Spahns PID-Vorstoß
Die Unionsfraktion hat einen Vorstoß des eigenen Gesundheitsministers Jens Spahn (CDU) gestoppt, die umstrittene Präimplantationsdiagnostik (PID) von der gesetzlichen Krankenversicherung bezahlen zu lassen. Laut eines Berichts der „Welt“ (Mittwochsausgabe) hat sich die Arbeitsgruppe Gesundheit der CDU/CSU-Fraktion am Dienstagmorgen einstimmig dagegen ausgesprochen, die PID jetzt zur Kassenleistung zu machen. Da die Abgeordneten auch die Rückendeckung des Fraktionsvorsitzenden Ralph Brinkhaus haben, wird …
Jetzt lesen »