Expanded time constant condition control system using a...

Details Expanded time constant condition control system using a... Expanded time constant condition control system using a...

G - Physics

05

D

341/113

G05D 23/20 (2006.01) G05B 11/42 (2006.01) G05D 23/24 (2006.01) H03K 21/00 (2006.01)

Patent

CA 1137596

ABSTRACT OF THE DISCLOSURE 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 a resettable unidirectional type counter that has two counting channels. The main counting channel provides for the counting function during the normal cycling of the system when in the pro- portional band. A second channel in the counter acts to enable to the counter rapidly in the event that there is a disruption of the counting when the condition responsive system has been outside of the proportional band.

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