Automatic PID controller in which the ratio of the control target value to the control signal is used to optimize performance
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United States of America Patent
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Jun 28, 1994
Grant Date -
N/A
app pub date -
Sep 11, 1992
filing date -
Jul 16, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A control target value x.sub.s, a present control signal x(n), and a present operating signal y(n) are input to a first control element which calculates r(n).y(n) where r(n) is the value of the ratio of the control target value to the control signal (=x.sub.s /x(n)). The control target value x.sub.s, the control signal x(n), and a differential parameter kd of the conventional PID control set by a parameter setting device are input to a second control element which calculates kd.r(n)(.DELTA.x.sub.s (n)-r(N)..DELTA.x(n)) where .DELTA.x.sub.s (n)=x.sub.s (n)-x.sub.s (n-1) and .DELTA.x(n)=x(n)-x(n-1). The outputs of both control elements are added to yield the next operating signal y(n+1). This design can provide an automatic control apparatus capable of achieving a good control performance even if an object element has a non-linear characteristic.
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