Data processing: generic control systems or specific application – Specific application – apparatus or process – Mechanical control system
Reexamination Certificate
2011-04-12
2011-04-12
Jarrett, Ryan A (Department: 2121)
Data processing: generic control systems or specific application
Specific application, apparatus or process
Mechanical control system
C417S043000
Reexamination Certificate
active
07925385
ABSTRACT:
The present invention provides an algorithm that utilizes flow reference data which can be mathematically determined as a function of various pump and motor parameters such as speed, torque or power or from calibrated flow curves stored in an evaluation device, or from an external flow reference such as a flowmeter. Once the PID control valve has reached its steady state condition a calculated flow value is captured and compared to the current flow value obtained after the variable frequency drive has decreased in frequency (speed). The valve position is optimized just prior to the speed threshold where the flow condition of the algorithm is no longer true.
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Three pages, German Office Action dated Jun. 26, 2009.
Two pages, English Translation of German Office Action dated Jun. 26, 2009.
DE4243118 English Translation.
Stavale Anthony E.
Verdehem Brian S.
ITT Manufacturing Enterprises, Inc
Jarrett Ryan A
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