EP2047118A1 - Procédé de localisation de défaut et de diagnostic d'une installation fluidique - Google Patents

Procédé de localisation de défaut et de diagnostic d'une installation fluidique

Info

Publication number
EP2047118A1
EP2047118A1 EP07703456A EP07703456A EP2047118A1 EP 2047118 A1 EP2047118 A1 EP 2047118A1 EP 07703456 A EP07703456 A EP 07703456A EP 07703456 A EP07703456 A EP 07703456A EP 2047118 A1 EP2047118 A1 EP 2047118A1
Authority
EP
European Patent Office
Prior art keywords
component
chamber
deviation
dependent
components
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.)
Granted
Application number
EP07703456A
Other languages
German (de)
English (en)
Other versions
EP2047118B1 (fr
Inventor
Jan Bredau
Reinhard Keller
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.)
Festo SE and Co KG
Original Assignee
Festo SE and Co KG
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 Festo SE and Co KG filed Critical Festo SE and Co KG
Publication of EP2047118A1 publication Critical patent/EP2047118A1/fr
Application granted granted Critical
Publication of EP2047118B1 publication Critical patent/EP2047118B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for

Definitions

  • the invention relates to a method for limiting errors and diagnosis in a fluidic system, wherein the fluidic volume flow of the entire system or at least a portion of the same or a dependent size is detected as a measured variable in each case during one operating cycle and compared with stored references, and wherein at the time a deviation or change in the deviation from the reference is determined, in which component or components of the system, the FIUI idwinging process has taken place, in order to recognize them then as faulty.
  • the leakage location can be delimited stepwise in an advantageous manner so that the fault location can be determined in a simple manner even with a large number of simultaneously active components or subsystems. This is all the more a special advantage
  • 25 th of actuators are not absolutely necessary. The more different the axis movements are and the more different cycles occur with simultaneously moving subsystems or components or combinations thereof, the more advantageously the method according to the invention can be used.
  • fluid consumption reference curves formed from integrated volume flow values or conductance reference curves formed from integrated conductivity values (Q / P) have proven to be particularly suitable, which are compared with lo corresponding measurement curves.
  • Reference curves or conductance reference curves stored in a selection matrix can be selected or specified for the respective cycle, for example, by successively checked for correlation with the respective 25 duty cycle.
  • the reference curves are expediently detected in a learning mode, in particular also during the later operation of the fluidic system.
  • a curve comparison with respect to possible time shifts is preferably carried out prior to the diagnosis of leakage, wherein a time shift exceeding a tolerance value is switched to further stored reference curves for their checking or an error message and / or a stop of another leakage diagnosis is triggered.
  • differential values or a difference curve between the measured variable curve and the reference curve are formed for a particularly advantageous evaluation.
  • This difference curve is expediently filtered in a frequency-dependent manner by means of an integrator, which in particular has a phase shift of -90 °, in order to filter out interference signals and spikes.
  • a filtered compensation curve is then formed by calculating the slope of the integral of the difference values or the difference curve, which then provides a particularly simple, purposeful evaluation
  • FIG. 1 shows a pneumatic system, in the supply of which a flow meter is connected;
  • Figure 2 is a Leitwertdiagramm to explain the occurrence of a time shift between the trace and reference curve
  • FIG. 3 Conductance diagrams for explaining the diagnosis of leakage.
  • a pneumatic system is shown schematically, which could in principle also be another fluidi- 5 plant, such as a hydraulic system, act.
  • the pneumatic system consists of five subsystems 10-14 or components, which may each be actuators, such as valves, cylinders, linear actuators and the like, as well as combinations of the same. These subsystems 10-14 are fed by a pressure source 15, wherein a flow meter 17 for measuring the flow or the volume flow is arranged in a common supply line 16.
  • An electronic control device 18 is used to specify the process of the system and is electrically connected to the subsystems 10-14 via corresponding control lines.
  • the subsystems 10-14 receive control signals from the electronic control device 18 and send sensor signals back to them.
  • sensor signals are for example position signals, limit switch signals, pressure signals, temperature signals and the like, which are not absolutely necessary in the simplest case.
  • the flow meter 17 is connected to an electronic diagnostic device 19 which additionally supplies the signals of a temperature sensor 20 and a pressure sensor 21 for measuring the temperature T and the pressure P in the supply line 16, ie the temperature and the pressure of the fluid
  • the diagnostic results are supplied to a display 22, these diagnostic results of course also stored, printed, optically and / or acoustically displayed or a center via lines or wirelessly can be transmitted.
  • the sensors 20, 21 as well as 23 and 24 can also be dispensed with in a simplest embodiment, although at least one temperature sensor 20 and one pressure sensor 21 can be expediently provided.
  • the diagnostic device 19 can also be integrated in i5 of the electronic control device 18, which may contain, for example, a microcontroller for carrying out the sequence program and optionally for diagnosis.
  • the diagnosis can be made in the simplest case by comparing stored and selected fluid consumption reference curves
  • the fluid consumption reference curves are formed from integrated or totalized volumetric flow values.
  • diagnostic control values where the diagnostic control value is a characteristic variable of a fluidic system or of a fluidic system that consists of various subsystems.
  • the conductance characterizes the behavior of the entire system over a defined cycle.
  • Conductance reference curves are formed in the simplest case from integrated Leitwertgr ⁇ touch Q / P, where Q is the respective volume flow value and P is the measured working pressure. These conductance reference curves are compared with corresponding measured value curves, ie with measured value curves formed from integrated conductance variables. i5
  • the conductance values or conductance curves and conductance reference curves can be compensated and refined by further measurement parameters, for example by the measured operating temperature T, the moisture content and / or the particle content of the fluid, the type of fluid and of each
  • Such operating states are, for example, the warm-up, the operation after a long standstill, the reclosing when retrofitting or the operation at predeterminable time intervals, that is, for example, after a one-hour or ten-hour
  • Non-cyclic processes can be subdivided into subcycles, to which the diagnostic procedure is then applied.
  • the respective measurement curve must now be synchronized with the selected or selected reference curve, ie, without leakage, the two curves are congruent, with leakage they run synchronously in time, but show deviations in the amplitude.
  • the two curves to be compared must therefore first be checked for correlation, that is, it must be checked whether temporal shifts have occurred, for example due to changed processes within a cycle. If time shifts have been detected over a defined tolerance i5, the further evaluation of leaks is stopped and a message regarding changes in the times of subsystems is generated. A time error is detected if the value of the air consumption at the end of the cycle is within a tolerance range, but the cycle time
  • a corresponding message can then be displayed, saved or forwarded.
  • the difference between the nominal value or measured value and the reference value that is to say between the measured quantity curve Km and the reference curve Kref, is set in the next step, as shown in FIG. 3, above.
  • the formed difference curve which is shown in FIG. 3, below, defines the summed distance of the measured variable curve from the reference curve at any time.
  • the time points of leaks show the staircase increases in the difference.
  • these differences in the difference are assigned to the leak-causing subsystems or components or actuator chambers.
  • the calculated difference or difference curve can be filtered.
  • the change in phase and amplitude is frequency dependent.
  • an integrator is used, which has a fixed phase shift of -90 °.
  • the amplitude response can be adjusted by changing the sampling time so that there is a constant attenuation of the amplitude in the desired frequency range, while other frequencies are filtered.
  • a compensation function of the integral of the calculated difference is subsequently formed.
  • the choice of the corresponding compensation function can be made according to the Gaussian least squares principle. It must be determined which curve best suits the calculated measurement points of the difference. In the following, a straight line is chosen as the simplest possibility of a compensation function. Of course, other compensation functions are possible. Any occurring leakage leads
  • the candidate actuator chambers are more and more limited, and the
  • chamber A of subsystem 10 is responsible for the leakage.
  • each chamber of an actuator which in the case of a working cylinder is for example two chambers, two each
  • each chamber is assigned a timer.
  • the timer is used to exclude additional actuator chambers or components from the consideration of a leak. If a chamber or a component is under pressure and no leakage occurs
  • this chamber is also treated as not involved in the leakage and excluded for further leak detection.
  • the electrical components, ie counters and timers, are located, for example, in the diagnostic device
  • the timers are started and, if a leak occurs, they are reset to zero and held there until
  • this chamber is considered to be responsible for the leakage and it is checked whether the gradient and the center distance of the compensation straight line or another compensation function has increased by a predefinable value or by a predeterminable percentage (based, for example, on the respective maximum value of the or one of the preceding lo cycles). In this case, the one for the
  • Incline responsible counter and / or the counter associated with the axis distance increased by the value 1. The more different the axis movements of a plurality of simultaneously moving subsystems or components and the more different cycles occur, the more accurate this method becomes. For each leak where the component or chamber of a component is pressurized, the associated counters will be incremented by a further counter, depending on the increase in the slope and / or the center distance.
  • the chamber or component with the second highest total count is the second largest likely to leak. This is important if several leaks occur in the system. If more than a fixed percentage of chambers, e.g. more than 50%, as the
  • the sum of the multiple analyzes 5 then gives more accurate information about the chamber or component causing the leakage or the chambers or components causing the leakage.
  • a single timer may be provided for all chambers or components, each of which is reset to zero during the occurrence of a leak and held there during the occurrence of the leakage. During this period, it is then checked which chambers or which components are active, that is to say are pressurized.
  • 20 rens can still be done by completely dispensing with the determination of the center distance or the slope and only the counter of a chamber or a component is increased by the value 1, if this chamber or component at least during a sub-period of a leakage interval

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Examining Or Testing Airtightness (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)

Abstract

L'invention concerne un procédé de localisation de défaut et de diagnostic d'une installation fluidique, sachant que le débit volumique de l'ensemble de l'installation ou d'au moins une région partielle de celle-ci, ou une grandeur qui en dépend, est respectivement enregistré comme grandeur de mesure pendant un cycle opératoire, et est comparé à des références mémorisées. Chaque fois au moment d'un écart ou d'une modification de l'écart par rapport à la référence, on détermine pour quel composant ou pour quels composants (10-14) de l'installation a eu lieu un processus influençant la consommation de fluide, afin d'identifier alors ce ou ces composants comme défectueux. Dans le cas d'un tel écart ou d'une telle modification de l'écart et de l'apparition simultanée de plusieurs activités de plusieurs composants (10-14) influençant la consommation de fluide, on exécute un processus d'élimination selon lequel, pour les activités consécutives auxquelles participe au moins un de ces composants (10-14), on contrôle chaque fois au cours d'étapes de contrôle supplémentaires si un écart ou une modification de l'écart survient à nouveau. Au cours de chacune de ces étapes de contrôle supplémentaires, on élimine chaque fois les composants concernés de la suite du contrôle, en tant que composants non défectueux, s'il ne se produit pas d'écart ou de modification de l'écart.
EP07703456A 2007-02-14 2007-02-14 Procédé de localisation de défaut et de diagnostic d'une installation fluidique Active EP2047118B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/001269 WO2008098589A1 (fr) 2007-02-14 2007-02-14 Procédé de localisation de défaut et de diagnostic d'une installation fluidique

Publications (2)

Publication Number Publication Date
EP2047118A1 true EP2047118A1 (fr) 2009-04-15
EP2047118B1 EP2047118B1 (fr) 2011-10-19

Family

ID=38544143

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07703456A Active EP2047118B1 (fr) 2007-02-14 2007-02-14 Procédé de localisation de défaut et de diagnostic d'une installation fluidique

Country Status (7)

Country Link
US (1) US7917325B2 (fr)
EP (1) EP2047118B1 (fr)
KR (1) KR20100014067A (fr)
CN (1) CN101427033A (fr)
AT (1) ATE529643T1 (fr)
TW (1) TW200846275A (fr)
WO (1) WO2008098589A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11472392B2 (en) 2017-12-01 2022-10-18 Continental Automotive Systems, Inc. Method for operating a brake system for motor vehicles, and brake system

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011012558B3 (de) * 2011-02-26 2012-07-12 Festo Ag & Co. Kg Druckluft-Wartungsgerät und damit ausgestattete Verbrauchersteuervorrichtung
CN102606559B (zh) * 2012-02-22 2016-01-20 安徽金达利液压有限公司 液压故障检测仪
CA2942284A1 (fr) * 2014-03-11 2015-09-17 British Gas Trading Limited Determination de l'etat de fonctionnement d'un appareil electromenager
DE102014016820A1 (de) * 2014-11-14 2016-05-19 Abb Technology Ag Verfahren zum Betrieb eines Durchflussmessers
FI128394B (en) * 2014-12-09 2020-04-30 Hydroline Oy Monitoring device and method for determining the condition of a pressure medium device
EP3243608B1 (fr) * 2016-05-09 2022-04-06 J. Schmalz GmbH Procede de surveillance des etats de fonctionnement d'un actionneur commande par pression et actionneur commande par pression
EP3699498A1 (fr) * 2019-02-21 2020-08-26 E.ON Sverige AB Procédé et appareil permettant de déterminer une déviation dans un circuit d'énergie thermique

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Publication number Priority date Publication date Assignee Title
JP3870814B2 (ja) * 2002-03-29 2007-01-24 株式会社デンソー 圧縮エア監視システム
DE502004005786D1 (de) * 2003-07-28 2008-02-07 Wabco Gmbh Verfahren und vorrichtung zum erkennen eines defektes oder ausfalls eines druckluftverbraucherkreises in einer elektronischen druckluftanlage für fahrzeuge
US7031850B2 (en) * 2004-04-16 2006-04-18 Festo Ag & Co. Kg Method and apparatus for diagnosing leakage in a fluid power system
WO2005111433A1 (fr) * 2004-04-16 2005-11-24 Festo Ag & Co Procede de localisation de defaut et diagnostic d'une installation fluidique
WO2005111453A1 (fr) 2004-05-13 2005-11-24 Hitachi, Ltd. Actionneur d'embrayage de transmission automatique

Non-Patent Citations (1)

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Title
See references of WO2008098589A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11472392B2 (en) 2017-12-01 2022-10-18 Continental Automotive Systems, Inc. Method for operating a brake system for motor vehicles, and brake system

Also Published As

Publication number Publication date
TW200846275A (en) 2008-12-01
CN101427033A (zh) 2009-05-06
US20100153026A1 (en) 2010-06-17
ATE529643T1 (de) 2011-11-15
WO2008098589A1 (fr) 2008-08-21
KR20100014067A (ko) 2010-02-10
EP2047118B1 (fr) 2011-10-19
US7917325B2 (en) 2011-03-29

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