Electricity: motive power systems – Positional servo systems – 'reset' systems
Patent
1976-09-09
1978-05-16
Schaefer, Robert K.
Electricity: motive power systems
Positional servo systems
'reset' systems
318678, G05B 1136
Patent
active
040901211
ABSTRACT:
A process controller which has at least a derivative control mode includes a comparison amplifier wherein a measured variable signal is compared with a set-point signal to produce an error signal. An auxiliary control circuit including a signal level change detector is connected to detect changes in the set-point signal. During intervals of constant set-point signal, the primary control circuit operates normally. Upon the occurrence of a change in the set-point signal, the change is detected by the auxiliary control circuit and produces an auxiliary control signal which is applied to momentarily inhibit the operation of the derivative control function of the controller.
REFERENCES:
patent: 3377548 (1968-04-01), Newbold
patent: 3441836 (1969-04-01), Riley
patent: 3819999 (1974-06-01), Platt
Nelson Robert A.
Saul Glenn
Burton Lockwood D.
Feldhaus John J.
Honeywell Inc.
Marhoefer Laurence J.
Schaefer Robert K.
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