The PID controller is the most common form of feedback. It was an essential

element of early governors and it became the standard tool when

process control emerged in the 1940s. In process control today, more than

95 of the control loops are of PID type, most loops are actually PI control.

PID controllers are today found in all areas where control is used.

The controllers come in many different forms. There are standalone

systems

in boxes for one or a few loops, which are manufactured by the

hundred thousands yearly-The PID controller is the most common form of feedback. It was an essential

element of early governors and it became the standard tool when

process control emerged in the 1940s. In process control today, more than

95　of the control loops are of PID type, most loops are actually PI control.

PID controllers are today found in all areas where control is used.

The controllers come in many different forms. There are standalone

systems

in boxes for one or a few loops, which are manufactured by the

hundred thousands yearly..