Showing papers on "PID controller published in 1969"
Patent•
25 Jun 1969TL;DR: In this paper, a method and apparatus for controlling a process variable wherein the variable is controlled primarily by a digital computer but where a part of the control function is performed by an analog controller is presented.
Abstract: A method and apparatus for controlling a process variable wherein the variable is controlled primarily by a digital computer but where a part of the control function is performed by an analog controller. When the control is by the computer, an output signal is passed intermittently from the computer to a memory amplifier, the output signal of which is a control signal that may be used for correcting the process variable. When control is by the controller, the memory amplifier operates as a summing amplifier for negative feedback control.
36 citations
01 Jun 1969
TL;DR: In this paper, the authors discussed the design of proportional controllers for sampled-data control systems using the error integrals as a design criteria for both the classical servomechanism and regulator (disturbance) problems.
Abstract: : The basic objective of most engineering endeavors is to accomplish a stated objective with a minimum expenditure of funds, which in many cases reduces to using the simplest configuration that meets the requirements. The simplest control system is, of course, the proportional or gain-only controller. The design of such controllers for continuous systems using frequency domain concepts is well-treated in classical servomechanisms texts. However, the design of such systems in the time domain using minimum error integrals has not been so well-treated. This report discussed the design of proportional controllers for sampled-data control systems using the error integrals as a design criteria. Both the classical servomechanism (set point) and regulator (disturbance) problems are treated. Three different error integrals are used, with two different modifications to make them converge. Some advantages of proportional over proportional integral (PI) and proportional-integral-derivative (PID) controllers are cited. (Author)
1 citations
TL;DR: The minimal overshoot and settling time of error-sampled feedback time-delayed control systems was carried out by incorporating a digital controller in the forward path of the control loop using the state-transition method and the variable-gain approach.
Abstract: In this paper the minimal overshoot and settling time of error-sampled feedback time-delayed control systems was carried out by incorporating a digital controller in the forward path of the control loop. Using the state-transition method the controller was designed by applying the variable-gain approach. The effect of parameter variation on the compensated response is also studied.