PID

(redirected from PID controller)
Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

PID

PID

(1) (Process IDentifier) A temporary number assigned by the operating system to a process or service.

(2) (Proportional-Integral-Derivative) The most common control methodology in process control. It is a continuous feedback loop that keeps the process flowing normally by taking corrective action whenever there is any deviation from the desired value ("setpoint") of the process variable (rate of flow, temperature, voltage, etc.). An "error" occurs when an operator manually changes the setpoint or when an event (valve opened, closed, etc.) or a disturbance changes the load, thus causing a change in the process variable.

The PID controller receives signals from sensors and computes corrective action to the actuators from a computation based on the error (proportional), the sum of all previous errors (integral) and the rate of change of the error (derivative). See PAC.


Inputs from a PID
The large white boxes are Opto 22 SNAP PACs, which are programmable automation controllers that are processing the PID loops in Chevron's research facility in Richmond, Virginia. The wires come from thermocouples that sense pipe temperature in a laboratory test that analyzes the best way to break down crude oil. The PACs determine when to raise and lower the temperature, and the three modules with the black sockets send digital signals to the heaters (cables not connected in this image). (Image courtesy of Opto 22, www.opto22.com)
References in periodicals archive ?
Aidan o'Dwyer, "Hand book of PI and PID controller tuning rules", 3rd edition.
16] Intelligent Fuzzy Immune PID Controller Design for Multivariable Process Control System, 2010.
This paper develops the fuzzy PID controller by using the graphical virtual instrument software Labview 8.
For example, PID controller must be adjusted by Ziegler-Nichols rules and the gain of LQR controller must be computed so that these category can be extremely difficult.
5 with PID controller, then for desired output linear speed of 1 m/s with PI with deadbeat response will result in response curves shown in Figs 15 and 16.
Thus, the decentralized controllers proposed here answer the need for a traditional PID controller that gives satisfactory responses to both setpoint and disturbance inputs.
Using a simple fuzzy rule base for errors between the set-point and output, and training the parameters of an NN, an adaptive neuro-fuzzy (ANF) method was developed by Jian and Wenjian (2000) to be used along with a secondary loop with a PID controller to regulate the supply air pressure, which was found to offer a better performance compared to a pure PID controller alone.
Tests included flights when the classical PID controller was responsible for pitch and roll stabilization and flights when the extended PID was used.
The three parameters in the PID controller proportional gain ([k.
On the other hand, both SNN inverse model and PID controller cannot ensure that the reactor temperature follows the optimal temperature profile exactly as seen in Figure 6(b) and Figure 6(c), respectively.
The most common "workhorse" regulator is the PID controller.
A PID controller, DC injection braking and an integral dynamic braking transistor (IGBT) and resistor are all standard.