Detection and discrimination of instabilities in process control loops
First Claim
1. A method of determining the existence of an instability within a process control loop using a process control device comprising the steps of:
- measuring one or more signals within the process control loop when the process control loop and the process control device are connected on-line and continuously in service under normal operating conditions within a process control environment;
storing the one or more measured signals as signal data; and
performing an analysis on the stored signal data to determine the existence of an instability within the process control loop.
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Accused Products
Abstract
A method and apparatus determines the presence of and source of instabilities, such as limit cycles, within a process control loop while the process control loop operates on-line within a process environment. The method and apparatus measures one or more signals within a process control loop when the process control loop is connected on-line within a process control environment, stores the measured signal as signal data and then performs one or more statistical analyses on the stored signal data to determine whether instabilities exist and, if so, whether the source of an instability is within a servo loop or outside of a servo loop and is due to friction, external forces or mechanical anomalies.
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Citations
28 Claims
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1. A method of determining the existence of an instability within a process control loop using a process control device comprising the steps of:
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measuring one or more signals within the process control loop when the process control loop and the process control device are connected on-line and continuously in service under normal operating conditions within a process control environment;
storing the one or more measured signals as signal data; and
performing an analysis on the stored signal data to determine the existence of an instability within the process control loop. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system to be used in a process control environment to determine an existence of an instability within a process control loop, the system comprising:
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a computer readable memory;
a first routine stored on the computer readable memory and adapted to be executed on a processor to collect and store data indicative of one or more signals associated with the process control loop and the process control device while operating on line and continuously in service under normal operating conditions within the process control environment; and
a second routine stored on the computer readable memory and adapted to be executed on a processor to perform a statistical analysis on the stored data to determine the existence of an instability within the process control loop. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification