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Pattern recognition adaptive controller and method used in HVAC control

  • US 5,506,768 A
  • Filed: 08/16/1994
  • Issued: 04/09/1996
  • Est. Priority Date: 10/29/1992
  • Status: Expired due to Term
First Claim
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1. A method of dynamically adjusting the control parameters of a proportional gain and integral time controller disposed to control an HVAC actuator, comprising the steps of:

  • sampling a feedback signal representative of an output air temperature of the HVAC system to generate a sampled signal;

    generating a smoothed signal based on the sampled signal;

    determining an estimated noise level of the sampled signal;

    determining a tune noise band based on the estimated noise level and the smoothed signal;

    adjusting the gain and integral time values used by the controller if either the difference between a previous setpoint temperature and a current setpoint temperature, or the difference between the current setpoint temperature and the smoothed signal, falls outside the tune noise band; and

    utilizing the adjusted control parameters to adjust the position of the actuator.

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