Expanded time constant condition control system

Details Expanded time constant condition control system Expanded time constant condition control system

1978-01-27

1980-04-01

Griffin, Donald A.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

236 46F, 307 97, 219492, 328 73, G05D 2320

Patent

active

041963563

ABSTRACT:
A condition responsive time proportional control means which has a relatively fast time constant when operating in its proportional band has the time constant expanded by means of a digital counter. The counter is repetitively switched by the condition responsive means and counts the switched operation. During the period that the switched operation is occurring, the time constant is expanded by simultaneously counting pulses from a pulse generating means.

REFERENCES:
patent: 3523182 (1970-08-01), Phillips
patent: 3579122 (1971-05-01), Paine
patent: 3964677 (1976-06-01), Schalow
patent: 4025866 (1977-05-01), Fletcher
Time-Proportional Control, C. H. Loos, Control Engineering, May 1965, pp. 65-70.

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