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Temperature controller with model-based time to target calculation and display

  • US 9,104,211 B2
  • Filed: 01/04/2011
  • Issued: 08/11/2015
  • Est. Priority Date: 11/19/2010
  • Status: Active Grant
First Claim
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1. A method for controlling air temperature in a building using an HVAC system including a wall-mounted thermostat, the method comprising:

  • operating the HVAC system to bring the controlled air temperature to a target temperature;

    using a processing system within the wall-mounted thermostat to estimate an amount of time associated with the controlled air temperature reaching the target temperature based on a mathematical model of the thermodynamic characteristics of the building which learns a dependence of time to reach a target temperature using at least a current indoor temperature, whereincomputation of the estimated amount of time is performed by the processing system using past observations of times to reach target temperatures; and

    displaying information on the wall-mounted thermostat to a user representative of the estimated amount of time, the information comprising;

    a numeric representation of the estimated amount of time to reach the target temperature; and

    a graphical representation of the estimated amount of time to reach the target temperature, the graphical representation comprising an arc of a circle that partially encircles a numeric representation of the target temperature.

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