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HVAC system, a method for operating the HVAC system and a HVAC controller configured for the same

  • US 10,496,057 B2
  • Filed: 01/08/2016
  • Issued: 12/03/2019
  • Est. Priority Date: 01/19/2015
  • Status: Active Grant
First Claim
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1. A controller for a heating, ventilating and air conditioning (HVAC) system, the controller comprising:

  • an interface configured to;

    receive a comfort temperature set point for an enclosed space, the comfort temperature set point comprising a single set point used for both heating mode and cooling mode operation of the HVAC system; and

    receive a sensed temperature for the enclosed space; and

    a processor configured to;

    operate the HVAC system in a conditioning mode of operation, the conditioning mode of operation being one of;

    a heating mode and a cooling mode;

    after operating the HVAC system in the conditioning mode of operation, determine whether to operate the HVAC system in an opposite conditioning mode based on a comparison of a total error value to a pre-determined threshold, wherein;

    the opposite conditioning mode is the heating mode if the conditioning mode of operation is the cooling mode and the opposite conditioning mode is the cooling mode if the conditioning mode of operation is the heating mode;

    the total error value is calculated as a sum of a proportional error and an integral error;

    the proportional error is calculated based on a present value of a temperature error scaled according to a proportional gain value, the present value of the temperature error being calculated as a difference between the comfort temperature and the sensed temperature; and

    the integral error is determined based on a change counter, wherein the integral error is set to zero when the change counter is below a change threshold, wherein the change counter is incremented or decremented according to a slope of the sensed temperature of the enclosed space over time;

    in response to determining that the total error value exceeds the pre-determined threshold, operate the HVAC system in the opposite conditioning mode; and

    in response to determining that the total error value does not exceed the pre-determined threshold, operate the HVAC system in a coasting mode.

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