Expanded time constant condition control system
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 having input means responsive to said switched output signals;
said counting means including pulse generating means;
said pulse generating means having output means connected to said counting means and providing signals thereto; 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 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.
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21 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 having input means responsive to said switched output signals;
said counting means including pulse generating means;
said pulse generating means having output means connected to said counting means and providing signals thereto; 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, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
- condition responsive time proportional control means having switched output means;
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21. 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 digital 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;
digital counting means having input means responsive to said switched output signals;
said digital counting means including digital pulse generating means;
said digital pulse generating means having output means connected to said counting means and providing signals thereto; 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.
- condition responsive time proportional control means having switched output means;
Specification