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Electronically controlled programmable digital thermostat having variable threshold hysteresis with time

  • US 4,388,692 A
  • Filed: 09/03/1980
  • Issued: 06/14/1983
  • Est. Priority Date: 09/03/1980
  • Status: Expired due to Term
First Claim
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1. A thermostat system for controlling heating and cooling systems supplying an indoor area to maintain desired ambient temperatures during selected time periods in said area, said thermostat system comprising;

  • (a) temperature sensing means including at least one temperature sensor for sensing the ambient temperature of said area and for providing a digital signal indicative thereof;

    (b) means for generating time signals;

    (c) digital circuit means having a plurality of input and output terminals, said digital circuit means being coupled to said time signal means and said temperature sensing means for receiving said time signals and for monitoring said ambient temperature, said digital circuit means including logic circuitry for storing digital coded information entered therein while said information is being processed, said digital circuit means being responsive to real time and ambient temperature and to said digital coded information for controlling the heating and cooling systems in accordance with an electronic threshold hysteresis temperature which is variable with time in discrete steps around said desired ambient temperature, said discrete steps successively approaching the ambient temperature;

    (d) data entry means coupled to said digital circuit means for entering said digital coded information into said digital circuit means;

    (e) display means for displaying desired parameters of time and temperature including information entered from said data entry means; and

    (f) electrically controllable switch means coupled to at least one of said output terminals for selectively activating and deactivating said heating and cooling systems in accordance with a signal from said digital processor means derived from a comparison of the ambient temperature with the electronic threshold hysteresis temperature.

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