Invention Grant
- Patent Title: Feedback control system with normalized performance indices for setpoint alarming
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Application No.: US16230795Application Date: 2018-12-21
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Publication No.: US10579023B2Publication Date: 2020-03-03
- Inventor: Timothy I. Salsbury , Carlos Felipe Alcala Perez , Michael J. Ajax
- Applicant: Johnson Controls Technology Company
- Applicant Address: US MI Auburn Hills
- Assignee: Johnson Controls Technology Company
- Current Assignee: Johnson Controls Technology Company
- Current Assignee Address: US MI Auburn Hills
- Agency: Foley & Lardner LLP
- Main IPC: G05B11/42
- IPC: G05B11/42 ; F24F11/62 ; F24F11/30

Abstract:
A plant includes equipment that operate to affect a variable state or condition of the plant in response to a control signal. A feedback controller monitors a process variable received via a feedback signal from the plant and uses an error signal representing a setpoint error between the process variable and a setpoint to generate the control signal for the plant. An exponentially-weighted moving average (EWMA) calculator generates EWMA values based on the setpoint error. A normalized index generator uses the EWMA values to calculate a normalized performance index. A threshold generator generates a threshold based on a first alarm parameter κ representing a normalized magnitude of the setpoint error and a second alarm parameter η representing a normalized duration that the setpoint error has persisted. An alarm manager generates an alarm in response to the normalized performance index crossing the threshold.
Public/Granted literature
- US20190146423A1 FEEDBACK CONTROL SYSTEM WITH NORMALIZED PERFORMANCE INDICES FOR SETPOINT ALARMING Public/Granted day:2019-05-16
Information query
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