EP4567285A1 - Diagnostic en service d'un postionneur intelligent pour actionneurs pneumatiques - Google Patents

Diagnostic en service d'un postionneur intelligent pour actionneurs pneumatiques Download PDF

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Publication number
EP4567285A1
EP4567285A1 EP24216959.7A EP24216959A EP4567285A1 EP 4567285 A1 EP4567285 A1 EP 4567285A1 EP 24216959 A EP24216959 A EP 24216959A EP 4567285 A1 EP4567285 A1 EP 4567285A1
Authority
EP
European Patent Office
Prior art keywords
actuator
positioner
pressure
sampling
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP24216959.7A
Other languages
German (de)
English (en)
Inventor
Flavio Tondolo
Mirko COFFETTI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STI SRL
Original Assignee
STI SRL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by STI SRL filed Critical STI SRL
Publication of EP4567285A1 publication Critical patent/EP4567285A1/fr
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • F15B19/005—Fault detection or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6309—Electronic controllers using input signals representing a pressure the pressure being a pressure source supply pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a load pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6336—Electronic controllers using input signals representing a state of the output member, e.g. position, speed or acceleration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/634—Electronic controllers using input signals representing a state of a valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members

Definitions

  • the present invention relates to a method for implementing an "on-service" diagnostics of a "smart” positioned for pneumatic actuators.
  • a control valve regulates the flow of a fluid (for example: gas, steam, water or chemical compounds) that flows through a circuit of any industrial and civil system.
  • a fluid for example: gas, steam, water or chemical compounds
  • Such fluid is typically called a process fluid.
  • the regulation of such process fluid can occur by means of an actuator which, through the control fluid present in the actuator circuit, provides the driving force necessary for opening or closing the control valve.
  • control valve positioner or another positioning device
  • a control valve positioner is a device mounted upon the actuator, which can manage the flow of the control fluid by means of a control strategy, processed by means of algorithms managed by a microprocessor.
  • control valve positioners have been greatly improved, also due to the use of digital devices, capable of monitoring the key variables and of implementing more complex control and data recording algorithms.
  • the positioners currently available are provided with internal devices, for example with sensors, in order to read the following quantities, with the least delay and with the greatest possible (real-time) frequency (the references are the same as those which will be further used in figure 1 , and are coincident between respective quantity and respective sensor which measures it):
  • the "smart" electronic positioners applied to the actuator have the ability to perform a self-calibration, by means of which they assign values of 0% and 100% to the physical limits of the adjustment stroke.
  • the positioners perform a "tuning" of P. (proportional) or P.I. (proportional-integrative) or P.I.D. (proportional-integrative-derivative) parameters, relating to the deviation between requested position (set point) and current position.
  • ⁇ P P1-P2
  • valve signature the so-called "valve signature"
  • the evaluation of the current friction permits to have an evaluation of the current state of the valve, whereas its variation over time permits to perform analyses on the past and to make projections on the future state of the valve. It is important to underline that the analyses and projections can either easily be not truthful, or they are at most abundantly approximate, if the detected data are affected by influences not due to the friction but to other causes.
  • a scope of the present invention is achieved by means of a method for implementing an "on-service" diagnostics of an intelligent positioner for pneumatic actuators.
  • the "on-service" diagnostics according to the present invention includes the following phases:
  • the method for implementing an "on-service" diagnostics may be realized by means of a computer program having the features set forth in the appended independent software claim.
  • a control system 10 is applied to a valve 1, for regulating a process fluid.
  • the valve 1 is a component of a known type and comprises a shutter and a sealing seat.
  • the system 10 comprises an actuator 2, a positioner 3, a plurality of sensors (for example, a pressure sensor P1, P2, Pa and/or a sensor C and/or a position sensor Z) and a controller 5, provided with an analysis software.
  • the controller 5 can be a "stand alone" component, as well as it can be integrated into the positioner 3, as in the case here described.
  • the positioned also comprises a flow rate/pressure distributor device 4, configured to move a working fluid to and from the actuator 2 and the sensor C monitors the activation percentage of the device 4.
  • the actuator 2 by an exemplary and not limiting way, is double-acting.
  • the invention can also be implemented with single-acting actuators, having only one pressure chamber and where the balance of the forces occurs between a force related to the pressure present in the pressure chamber and a resistant force, for example an elastic force, just as the invention can also be extended to double-acting actuators, provided with an elastic reaction element.
  • the invention is applicable both to actuators with linear motion and to actuators with rotary motion.
  • the positioner 3 is a component which determines the "behavior" of actuator 2 by regulating the pressure acting within the pressure chambers of the actuator 2 itself.
  • the logical connection with the actuator 2 is achieved by means of feedback from the position sensor Z of the position of the actuator itself.
  • the positioner 3 Based on the feedback on the position of actuator 2, the positioner 3, by means of the device 4, is able to vary the pressure in the two chambers 21, 22 of the actuators 2 (pressure measured by respective pressure sensors P1, P2) in order to position the valve shutter 1 where it is required (required position S or set-point) . If the valve 1 is closed, therefore if the shutter is in contact with the seat, the positioner 3 can modulate the seat/shutter contact force by varying the pressure within the chambers of actuator 2.
  • the position must be read accurately both to ensure a correct attribution of 'where' and to quickly discriminate the movements.
  • the 'timestamp' is a fundamental element. It happens that the valve moves only in one direction allowing to store 'force' samples in various positions but only in a specific direction. Subsequently, it can happen that the valve moves in the opposite direction on the same positions.
  • the evaluation of the correctness of the 'friction' sample (which in order to exclude the forces coming from the valve fluid must assume that the forces are unchanged and therefore they reasonably must assume a temporal correlation) requires that the UP and DOWN samples of a particular position are at a short time distance.
  • the direction serves to discriminate how the forces are to be taken into account (the friction as such always opposes the direction of movement, other forces are independent of it, for example, the weight of the masses to be moved).
  • ⁇ P can be 'falsified' by pressure losses on the pipes (or other intermediate elements such as boosters) and accelerations, consequently it is necessary to correlate it to the speed of movement (therefore excluding the accelerations) and to the quantity of air supplied (flow in the pipes and pressure losses).
  • the method for implementing an on-line diagnostics of an intelligent positioned 3 for pneumatic actuators 2 and the algorithm, i.e. the computer program implementing the aforementioned online diagnostics methodology, are therefore based on the following phases:
  • the time distance should be reduced between two successive samplings of a particular position in both UP (e.g., towards valve closing) and DOWN (e.g., towards valve opening) travel directions.
  • a further evaluation of the functional state of the system can be made by analyzing the static and dynamic friction value.
  • the knowledge of the static friction/dynamic friction ratio and how it varies over time allows for a functional analysis and forecasts to be performed, establishing any attention and/or alarm thresholds based on the value and/or its variation over time.
  • the values from 1 to 3 must be individually configurable by a "self-tuning" and possibly modifiable by an expert.
  • the positioner can easily evaluate the flow rate it is supplying/discharging, it can know the actuator movement over time and therefore it can investigate which flow rate generates a negligible ⁇ P and which speeds are generated in these conditions by selecting the values 1 and 2.
  • the value 3 is deduced by performing initially fast movements, which are then brought back to conditions 1 and 2, verifying the delay necessary to read "stable" values.
  • the time interval ⁇ t3 must therefore be greater than or equal to this time.
  • the value 4 is instead a function of the type of valve and the controlled process, it can be set manually by an expert and by default a short time interval ⁇ t4 will be selected, also suitable for highly dynamic processes.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Servomotors (AREA)
EP24216959.7A 2023-12-06 2024-12-02 Diagnostic en service d'un postionneur intelligent pour actionneurs pneumatiques Pending EP4567285A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102023000026061A IT202300026061A1 (it) 2023-12-06 2023-12-06 Diagnostica on service di un posizionatore intelligente per attuatori pneumatici

Publications (1)

Publication Number Publication Date
EP4567285A1 true EP4567285A1 (fr) 2025-06-11

Family

ID=89845164

Family Applications (1)

Application Number Title Priority Date Filing Date
EP24216959.7A Pending EP4567285A1 (fr) 2023-12-06 2024-12-02 Diagnostic en service d'un postionneur intelligent pour actionneurs pneumatiques

Country Status (2)

Country Link
EP (1) EP4567285A1 (fr)
IT (1) IT202300026061A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6131609A (en) * 1996-06-11 2000-10-17 Neles Controls Oy Method for surveying the condition of a control valve, and a valve apparatus
US20010037159A1 (en) * 1997-07-23 2001-11-01 Henry Boger Valve positioner system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6131609A (en) * 1996-06-11 2000-10-17 Neles Controls Oy Method for surveying the condition of a control valve, and a valve apparatus
US20010037159A1 (en) * 1997-07-23 2001-11-01 Henry Boger Valve positioner system

Also Published As

Publication number Publication date
IT202300026061A1 (it) 2025-06-06

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