Abstract A closed-loop feedback control system for industrial processes, wherein a corrector receives a signal of variation and produces a process-regulating signal in the form of a transfer function F X G, wherein G represents a transfer function which is the equivalent unretarded transfer function of the controlled process and F is the factor of retardation. The corrector comprises a first and a second subtracter, a first group of circuit elements upstream of the elements of regulation connecting the input of the corrector to a first input of the first subtracter and constituted by elements having a proportional action, a second group of circuit elements downstream of the elements of regulation which include two circuits connected in parallel: the one circuit being constituted by elements having a proportional action, the other circuit being constituted by an integrator, said two circuits being connected to each other at their inputs, and an adder of which the inputs receive respectively the outputs of the two circuits, and which connect the output of the first subtracter to the output of the corrector, connecting means between the output of said integrater and a first input of the second subtracter, a retarding circuit having the transfer function F and connecting the output of said integrator to a second input of the second subtracter, and means for applying the output of the second subtracter to the second output of the first subtracter.
Inventors
👤 Gabriel Chevalier
👤 Roland Rouxel
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-27 17:33
CPC Classifications
G; G05; G05B; G05B6/00; G05B6/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
239 words
A feedback control system for regulating a time-retarded process having a transfer function F X G where G represents an equivalent unretarded transfer function and F represents a factor of retardation, the control system input being coupled to a control signal representative of the deviation of a process output from a reference value, the control system comprising: first and second subtracters; a first group of first linear elements for coupling the error signal from the control system input to the first input of the first subtracter; a second group of elements including an integrating element and a second linear element, an adder having first and second inputs and an output constituting the output of the control system, first means for connecting the output of the second linear element to the first input of the adder, and second means for connecting the output of the integrating element to the second input of the adder; third means for connecting the output of the first subtracter to the inputs of the integrating element and the second linear element; fourth means for connecting the output of the integrating element to the first input of the second subtractor; a retarding circuit having a transfer function equal to F and coupled between the output of the integrating element and the second input of the second subtractor; and fifth means for connecting tHe output of the second subtractor to the second input of the first subtractor.
Claim 2
Dependent Claim
239 words
A feedback control system for regulating a time-retarded process having a transfer function F X G where G represents an equivalent unretarded transfer function and F represents a factor of retardation, the control system input being coupled to a control signal representative of the deviation of a process output from a reference value, the control system comprising: first and second subtracters; a first group of first linear elements for coupling the error signal from the control system input to the first input of the first subtracter; a second group of elements including an integrating element and a second linear element, an adder having first and second inputs and an output constituting the output of the control system, first means for connecting the output of the second linear element to the first input of the adder, and second means for connecting the output of the integrating element to the second input of the adder; third means for connecting the output of the first subtracter to the inputs of the integrating element and the second linear element; fourth means for connecting the output of the integrating element to the first input of the second subtractor; a retarding circuit having a transfer function equal to F and coupled between the output of the integrating element and the second input of the second subtractor; and fifth means for connecting tHe output of the second subtractor to the second input of the first subtractor.
Claim 3
Dependent Claim
31 words
A system according to claim 1, wherein said integrating element includes an analog-digital converter, the retarding circuit is constituted by digital elements, and the fifth connecting means comprises a digital-analog converter.