PID controller with protection of the integrator against saturation upon a rapid change of the reference variable
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United States of America Patent
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Jan 29, 2002
Grant Date -
N/A
app pub date -
Jan 14, 1999
filing date -
Jul 24, 1996
priority date (Note) -
Expired
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Abstract
A PID controller has a parallel arrangement of a P-element, an I-element, and a D-element coupled to a first summation point for adding their respective output signals, a summation signal produced by the first summation point being employed for control of a variable. An actual value of the controlled variable is inputted to the parallel arrangement of the P-element, the I-element, and the D-element. The I-element is a series arrangement of a weighting section followed by an integrator, the I-element being coupled to the weighting section by a second summation point. The controller applies a time derivative of the actual value of the controlled variable to the second summation point, the second summation point subtracting the derivative from a signal outputted by the weighting section of the I-element.
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