Three element digital control system

Details Three element digital control system Three element digital control system

1987-07-21

1988-12-27

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

'reset' systems

318609, G05B 1142

Patent

active

047943130

ABSTRACT:
A universal three-element digital control system is described which forms a proportional signal, an integral signal and a derivative (differential) signal from an error signal and combines such signals to provide a controlling output signal to a device being controlled. The error signal is the difference between the actual signal, representative of the actual condition of the device being controlled, and the setpoint, which is representative of the desired condition. The proportional signal is proportional to the error signal. The integral and differential signals can be approximated by combining the previous error signals with the present error signal. Offset and multiplying elements are provided by which each of the signals can be offset or proportionalized to customize the control system for a particular application.

REFERENCES:
patent: 4146270 (1979-03-01), Nurmberger et al.

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