Method for optimizing valve position and pump speed in a PID control valve system without the use of external signals
AssigneeITT Manufacturing Enterprises, Inc.
InventorsAnthony E. Stavale, Brian S. Verdehem
Life of this patent
Estimating the term…
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.
Claims32
A controller comprising:
- at least one module configured to determine flow reference data based at least partly on signalling containing information about various pump and motor parameters including speed, torque or power, or from calibrated flow curves stored in an evaluation device, or from an external flow reference including a flowmeter;
- and
- at least one module, which is configured to utilize the flow reference data in order to provide corresponding signalling containing information to control a centrifugal pump, centrifugal blower, centrifugal mixer or centrifugal compressor, driven via a variable frequency drive, in a PID control valve system, wherein, once a PID control valve has reached its steady state normal condition, a calculated flow value is captured and compared to a current flow value obtained after the variable frequency drive has decreased in frequency (speed).
A method comprising:
- determining in at least one module flow reference data as a function of various pump and motor parameters including speed, torque or power, or from calibrated flow curves stored in an evaluation device, or from an external flow reference including a flowmeter;
- and
- utilizing in at least one module the flow reference data in order to control a centrifugal pump centrifugal blower, centrifugal mixer or centrifugal compressor, driven via a variable frequency drive, in a PID control valve system, wherein, once a PID control valve has reached its steady state normal condition, a calculated flow value is captured and compared to a current flow value obtained after the variable frequency drive has decreased in frequency (speed).
A controller comprising:
- at least one module configured to determine flow reference data based at least partly on signalling containing information about various pump and motor parameters including speed, torque or power, or from calibrated flow curves stored in an evaluation device, without using a flow sensor;
- and
- at least one module, which is configured to utilize the flow reference data in order to provide corresponding signalling containing information to control a centrifugal pump, centrifugal blower, centrifugal mixer or centrifugal compressor, driven via a variable frequency drive, in a PID control valve system, wherein, once a PID control valve has reached its steady state normal condition, a calculated flow value is captured and compared to a current flow value obtained after the variable frequency drive has decreased in frequency (speed).
A method comprising:
- determining in at least one module flow reference data based at least partly on signalling containing information about various pump and motor parameters including speed, torque or power, or from calibrated flow curves stored in an evaluation device, without using a flow sensor;
- and
- utilizing in at least one module the flow reference data in order to control a centrifugal pump, centrifugal blower, centrifugal mixer or centrifugal compressor, driven via a variable frequency drive, in a PID control valve system, wherein, once a PID control valve has reached its steady state normal condition, a calculated flow value is captured and compared to a current flow value obtained after the variable frequency drive has decreased in frequency (speed).
Dependencies are inferred from the claim text.