Patent ID: 11859848
Assignee: JOHNSON CONTROLS TYCO IP HOLDINGS LLP
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 8:
9. A method for affecting a flow rate of a fluid through a conduit, the method comprising:
performing a volumetric control process to generate a control signal for a drive device of a building device, the building device operable to affect the flow rate of the fluid through the conduit;
receiving an operating position signal of a control device indicating a current position of the control device within the conduit;
determining an estimated static pressure level within the conduit using the current position of the control device within the conduit without requiring a measurement of the estimated static pressure level, wherein determining the estimated static pressure level comprises (i) determining a first estimated static pressure level when the control device is in a first position within the conduit without requiring a measurement of the first estimated static pressure level and (ii) determining a second estimated static pressure level different from the first estimated static pressure level when the control device is in a second position within the conduit different from the first position without requiring a measurement of the second estimated static pressure level, wherein at least one of the first position or the second position is an intermediate position between a fully open position and a fully closed position;
updating the control signal based on the estimated static pressure level within the conduit determined using the current position of the control device within the conduit; and
operating the drive device based on the updated control signal to affect the flow rate of the fluid.