Title:
HVAC SYSTEM RELAY AUTOTUNING AND VERIFICATION
Document Type and Number:
WIPO Patent Application WO/2013/151646
Kind Code:
A3
Abstract:
Systems and methods for autotuning a HVAC system controller. The method may include receiving a performance coefficient and providing a step-input using an autotuner relay to measure ultimate gain and ultimate period in a controlled HVAC system. The method may also include adjusting the ultimate gain and ultimate period to account for a relay hysteresis, and applying a tuning rule to derive a proportional gain and an integral time for a controller of the HVAC system control loop. The method may further include updating the controller with the proportional gain and integral time, and verifying the proportional gain and integral time. Verifying the proportional gain and integral time may include setting a performance envelope having a tightness related to the performance coefficient, applying a step-input to provoke a closed-loop response, and comparing the closed loop response with the performance envelope to determine whether the closed-loop response is within the envelope.
Inventors:
ZHAO FUTAO (US)
FAN JUNQIANG (US)
MIJANOVIC STEVO (US)
FAN JUNQIANG (US)
MIJANOVIC STEVO (US)
Application Number:
PCT/US2013/028989
Publication Date:
February 20, 2014
Filing Date:
March 05, 2013
Export Citation:
Assignee:
CARRIER CORP (US)
International Classes:
F24F11/00; G05B11/42; G05B13/02
Domestic Patent References:
| WO2003081348A1 | 2003-10-02 |
Foreign References:
| EP0915301A2 | 1999-05-12 | |||
| US20110016893A1 | 2011-01-27 | |||
| US6554198B1 | 2003-04-29 | |||
| GB2348021A | 2000-09-20 | |||
| US5341651A | 1994-08-30 |
Attorney, Agent or Firm:
ATKINSON, Garrett, J. (1951 Kidwell Drive Suite 55, Tysons Corner VA, US)
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