Abstract :
In 1939, the Taylor Instrument Companies introduced a completely redesigned version of its Fulscope pneumatic controller. In addition to proportional and reset control actions, this new instrument provided an action which the Taylor Instrument Companies called pre-act. In the same year the Foxboro Instrument Company added Hyper-reset to the proportional and reset control actions provided by their Stabilog pneumatic controller. The pre-act and Hyper-reset actions each provide a control action proportional to the derivative of the error signal. Reset provides a control action proportional to the integral of the error signal and hence both controllers offered PID control. The historical development of these controllers is discussed.<>
Keywords :
controllers; history; three-term control; Foxboro Instrument Company; Fulscope pneumatic controller; Hyper-reset; PID controller; Stabilog pneumatic controller; Taylor Instrument Companies; development history; error signal; pre-act; proportional-reset control; Automatic control; Error correction; Force measurement; Instruments; Open loop systems; PD control; Proportional control; Temperature control; Testing; Three-term control;
