Expanded time constant condition control system using a unidirectional counter with multiple channels
First Claim
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1. An expanded time constant condition control system, including:
- condition responsive time proportional control means having switched output means;
said switched output means providing repetitively switched output signals at a rate representative of a time constant of said time proportional control means when said condition responsive means senses a condition which is within a selected range;
said switched output means providing constant output signals when said condition is outside of said selected range;
counting means including a plurality of unidirectional counters with said counting means having input means responsive to said switched output signals;
said counting means further including pulses generating means;
said pulse generating means having output means connected to said counting means and providing signals thereto;
said plurality of unidirectional counters including two counting channels;
a first counting channel normally processing signals from said time proportional control means output means and said pulse generating means;
a second counting channel being held in a state of readiness when said first counting channel is normally processing signals from said output means;
said second counting channel enabled to provide an override function for said counting means when said normal processing of signals has been disrupted for a preselected period of time; and
said counting means combining said condition responsive repetitively switched output signals and said pulse generating output signals to expand said time constant of said condition responsive time proportional control means at an output means of said counting means.
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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 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 proportional band. A second channel in the counter acts to enable to the counter rapidly in the event that there is a disruption of the counter when the condition responsive system has been outside of the proportional band.
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Citations
10 Claims
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1. An expanded time constant condition control system, including:
- condition responsive time proportional control means having switched output means;
said switched output means providing repetitively switched output signals at a rate representative of a time constant of said time proportional control means when said condition responsive means senses a condition which is within a selected range;
said switched output means providing constant output signals when said condition is outside of said selected range;
counting means including a plurality of unidirectional counters with said counting means having input means responsive to said switched output signals;
said counting means further including pulses generating means;
said pulse generating means having output means connected to said counting means and providing signals thereto;
said plurality of unidirectional counters including two counting channels;
a first counting channel normally processing signals from said time proportional control means output means and said pulse generating means;
a second counting channel being held in a state of readiness when said first counting channel is normally processing signals from said output means;
said second counting channel enabled to provide an override function for said counting means when said normal processing of signals has been disrupted for a preselected period of time; and
said counting means combining said condition responsive repetitively switched output signals and said pulse generating output signals to expand said time constant of said condition responsive time proportional control means at an output means of said counting means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- condition responsive time proportional control means having switched output means;
Specification