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Auto-configuring time-of day for building control unit

  • US 9,429,962 B2
  • Filed: 01/03/2012
  • Issued: 08/30/2016
  • Est. Priority Date: 11/19/2010
  • Status: Expired due to Fees
First Claim
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1. A thermostat, comprising:

  • a power source;

    a housing;

    a clock function for tracking time-of-day;

    a sensor that performs measurements of an environmental condition that varies with a time-of-day;

    a processor configured to;

    receive the measurements from the sensor,perform a transform to convert the received measurements to the frequency domain;

    identify a component of the received measurements in the frequency domain having a frequency of approximately 11.57 μ

    Hz;

    determine when the component having the frequency of approximately 11.57 μ

    Hz has crossed a predefined threshold;

    estimate the time-of-day using the determination of when the component having the frequency of approximately 11.57 μ

    Hz crossed the predefined threshold, andprogram the clock function using the estimated time-of-day;

    an electronic display configured to display information to a user; and

    a plurality of heating, ventilation, and air conditioning (HVAC) wire connectors communicatively coupled to the processor and configured control an HVAC system as a function of the estimated time-of-day.

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