Improved proportional integral-derivative control apparatus
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United States of America Patent
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-
Aug 14, 1984
Grant Date -
N/A
app pub date -
May 24, 1982
filing date -
Jun 1, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process control apparatus is provided which has a PID controller to which is supplied a sampled signal of a control deviation signal of a process value signal and a reference signal and which generates a PID control signal according to sampled-value PID control constants. A non-linear controller is connected in parallel with the PID controller. A sum signal of the output signals from the PID controller and the non-linear controller is supplied to a process through a holding circuit. The process control apparatus further includes a circuit for identifying the dynamic characteristic of the process according to the sum signal and the sampled signal of the process value, and a circuit for calculating a transfer function of the process in the Laplace operator domain and for determining the sampled-value PID constants of the PID controller according to the dynamic characteristic.
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