On-Line Monitoring and Fault Detection of Control System Performance.
On-Line Monitoring and Fault Detection of Control System
Seem, J. E.; House, J. M.; Monroe, R. H.
CLIMA 2000 Conference, Proceedings. August 30-September
2, 1997, Brussels, Belgium, 1-20 pp, 1997.
monitors; control loops; control system performance;
heating; ventilation; air conditioning; equations; fault
This paper presents a new method for monitoring the
performance of control loops. The method determines
performance indices using recursive relationships. The
recursive formulation gives the method two desirable
characteristics, namely, it is computationally
efficient, and the memory requirements are small because
only previous values of the performance indices are
stored. Consequently, the method can be implemented in
low-cost digital controllers, thereby reducing traffic
on the communication network. Building operators can use
the performance indices to quickly assess the
performance of a large number of controllers.
Performance indices may be used to quantify information
about the amount of travel of an actuator, the
difference between the desired process output and the
actual output, saturation of a controller, etc. This
paper presents laboratory and field test results
demonstrating the utility of the performance indices for
performance monitoring and fault detection in
variable-air-volume air-handling units with
pressure-independent variable-air-volume boxes.