Modified proportional integral derivative controller
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United States of America Patent
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Oct 30, 2012
Grant Date -
Dec 8, 2011
app pub date -
Jun 4, 2010
filing date -
Jun 4, 2010
priority date (Note) -
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Abstract
A method and device for controlling a process variable based upon a set point is disclosed. A process variable is measured, and a proportional term is assigned to a manipulated variable that is based upon a product of a proportional gain coefficient and an error magnitude between the process variable and the set point. An integral term is added to the manipulated variable under a first set of conditions, and a derivative term is added to the manipulated variable under a second set of conditions different from the first set of conditions. The sum of the proportional term, the integral term, and the derivative term is output, resulting in the process variable being responsively adjusted thereto.
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