Method for optimizing valve position and pump speed in a PID control valve system without the use of external signals
First Claim
Patent Images
1. 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).
2 Assignments
0 Petitions
Accused Products
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.
72 Citations
32 Claims
-
1. 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). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. 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). - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
-
17. 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). - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
-
-
25. 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). - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
-
Specification