Global control of HVAC distribution system
First Claim
1. A controller for controlling a component of a heating, ventilation and air-conditioning (HVAC) fluid distribution system, the controller comprising:
- means for identifying characteristics related to the component of the HVAC fluid distribution system utilizing system variables comprising a measured static pressure and a measured flow of the fluid to produce identified characteristics of the component; and
means, operatively coupled to the means for identifying, for controlling the component based, in part, on the identified characteristics.
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Accused Products
Abstract
A global control system is implemented in a heating, ventilation and air-conditioning (HVAC) distribution system. The system allows local controllers and a source controller to exchange data between one another so that optimization of control for a local component is not sacrificed for optimization of control for a source component, and vice versa. The controllers have their control process sudivided into an identification process and a control process. The identification process periodically identifies characteristics related to the component to be controlled. The control process continuously generates a control signal to be applied to the component to control the component. The control process is further subdivided into a feedforward process and a feedback process. The feedforward process utilizes the identified characteristics to generate a control signal based on calculated system variables, while the feedback generates a control signal based on measured system variables. The two control signals are then combined to control the component. The combination of the control signals produces a more accurate control signal since the effects of noise related to the measured system variables are mitigated by the combination of control signals.
82 Citations
24 Claims
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1. A controller for controlling a component of a heating, ventilation and air-conditioning (HVAC) fluid distribution system, the controller comprising:
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means for identifying characteristics related to the component of the HVAC fluid distribution system utilizing system variables comprising a measured static pressure and a measured flow of the fluid to produce identified characteristics of the component; and means, operatively coupled to the means for identifying, for controlling the component based, in part, on the identified characteristics. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A controller for controlling a component implemented in a heating, ventilation and air-conditioning (HVAC) fluid distribution system, the local controller comprising:
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a feedforward means for generating a feedforward control signal based on identified characteristics of the component and calculated system variables; a feedback means for generating a feedback control signal based on measured system variables; and means for combining the feedforward control signal and the feedback signal to achieve control of the local component. - View Dependent Claims (9, 10, 11, 12)
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13. A controller for controlling a component of a heating, ventilation and air-conditioning (HVAC) fluid distribution system, the controller comprising:
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an identification means for periodically producing identified characteristics of the component to be controlled; a feedforward means, coupled to the identification means, for generating a feedforward control signal based on control setpoints and the identified characteristics of the component; means, coupled to the feedforward means, for generating a continuous control signal based on measured system variables; and means for combining feedforward control signal and the continuous control signal to produce a control signal utilized to control the component. - View Dependent Claims (14)
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15. A controller for controlling a component of a heating, ventilation and air-conditioning (HVAC) fluid distribution system, the controller comprising:
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an identification means for periodically producing identified characteristics of the component to be controlled; and a feedforward means, coupled to the identification means, for generating a control signal based on control setpoints and the identified characteristics of the component to control the component.
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16. A controller for controlling at least one fan of a heating, ventilation and air-conditioning (HVAC) fluid distribution system, the controller comprising:
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means for identifying characteristics related to the fan to produce identified characteristics of the fan; and
,means, operatively coupled to the means for identifying, for controlling the fan, based in part on the identified characteristics which further comprise a pressure setpoint (Pfsp) and a flow setpoint (Qfsp) of air at the output of the fan, and a fan control signal (Y'"'"'f).
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17. A control system for use in a heating, ventilation and air-conditioning (HVAC) fluid distribution system, the control system comprising:
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means for measuring a pressure of the fluid near a local component; means for measuring a flow of the fluid near the local component; a local controller for determining a flow setpoint calculated from a temperature control loop located within said local controller and for controlling the local component based on the determined flow setpoint; and a source controller for controlling a source component of the fluid based, in part, on input related to the determined flow setpoint. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification