EP2672126B1 - Procédé pour déterminer la présence de gaz non dissous dans un système hydraulique - Google Patents

Procédé pour déterminer la présence de gaz non dissous dans un système hydraulique Download PDF

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Publication number
EP2672126B1
EP2672126B1 EP13170090.8A EP13170090A EP2672126B1 EP 2672126 B1 EP2672126 B1 EP 2672126B1 EP 13170090 A EP13170090 A EP 13170090A EP 2672126 B1 EP2672126 B1 EP 2672126B1
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Prior art keywords
medium
main circuit
flow rate
reservoir
pressure
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EP13170090.8A
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German (de)
English (en)
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EP2672126A1 (fr
Inventor
Klaus Leonard Witt
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Sun Test Systems BV
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Sun Test Systems BV
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    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/044—Removal or measurement of undissolved gas, e.g. de-aeration, venting or bleeding

Definitions

  • the invention relates to a method for determining the presence of undissolved gas in a hydraulic system comprising a main circuit with a primary reservoir containing a medium, and a by pass circuit connected to the main circuit and having a threshold pressure valve which opens at a threshold pressure.
  • the hydraulic system will in general be part of an apparatus, e.g. an airplane. If there is undissolved gas in the medium of the hydraulic system 9, the working of the hydraulic system 9 can be deteriorated so that the functioning of the apparatus 11 can be hindered. It will be clear that in certain applications of the hydraulic system 9, e.g. an airplane, this can lead to very serious and even life threatening situations.
  • a conventional method for determining the presence of undissolved gas in a hydraulic system is known from EP 2 302 270 A1 .
  • It is an object of the invention to provide an improved or at least alternative method for determining the presence of undissolved gas in a hydraulic system comprising a main circuit with a primary reservoir containing a medium, and a by pass circuit connected to the main circuit and having a threshold pressure valve which opens at a threshold pressure. Said method comprises the steps of:
  • the method allows to determine the presence of undissolved gas in the by pass circuit.
  • the presence of undissolved gas can be determined on basis of the measured flow rate during the period from the opening of the threshold pressure valve until the moment that a substantially constant flow rate is reached. These measurements over time of the flow rate provide an indication of the presence of the undissolved gas in the by pass circuit.
  • the measured flow rate can be compensated for the compressibility of the hydraulic system being free from undissolved gas.
  • the measured flow rate can be compared with a reference flow rate.
  • the reference flow rate can be obtained by subjecting a reference hydraulic system being free from undissolved gas to the steps A-E.
  • the reference hydraulic system can be the same hydraulic system which is subjected to the method.
  • step E comprises over time measuring the flow rate of the medium pumped from the secondary reservoir into the main circuit during the steps C and D.
  • the pressure of the medium in the hydraulic system is released just before step C is started.
  • the medium in step D is pumped at a constant pressure equal to or larger than the threshold pressure into the main circuit.
  • the hydraulic system during normal operation comprises a low pressure part and a high pressure part
  • the by pass circuit is located in the high pressure part and the method comprises pumping the medium of the secondary reservoir into the high pressure part upstream of the by pass circuit.
  • the testing apparatus is connected to the main circuit via a first fluid connection located upstream of the by pass circuit and a second fluid connection located downstream of the by pass circuit.
  • the steps C and D comprise pumping the medium into the main circuit only via the first fluid connection.
  • the second fluid connection is used as a return flow of medium to the secondary reservoir.
  • a further threshold pressure valve is provided in the return flow of medium to the secondary reservoir.
  • the further threshold pressure valve may be an adjustable threshold pressure valve.
  • the testing apparatus comprises a flow rate measuring system for measuring the flow rate of the medium pumped from the secondary reservoir into the main circuit.
  • the testing apparatus comprises a pressure measuring system for measuring the pressure of the medium pumped from the secondary reservoir into the main circuit.
  • the primary reservoir is a piston type reservoir and step B comprises filling the piston type reservoir until the piston reaches its end stop.
  • step B comprises the sub steps of
  • the sub steps B1 and B3 comprise pumping the medium into the main circuit via the first fluid connection and/or the second fluid connection.
  • Figure 1 shows a testing apparatus 1 provided with a secondary reservoir 3 containing a medium and a pump 7 connected to a hydraulic system 9 of an apparatus 11 to be tested e.g. an airplane.
  • the hydraulic system 9 comprises a main circuit 50 provided with a primary reservoir 13 containing the medium and a by pass circuit 60 having a threshold pressure valve 62 which opens at a threshold pressure.
  • a first system 51 e.g. a flight control system of an airplane
  • a second system 61 e.g. a utility circuit (such as a landing system)
  • a utility circuit such as a landing system
  • the primary reservoir 13 comprises a gas bleed valve 15 which is used to evacuate undissolved gas from the medium, e.g. oil, in the primary reservoir 13.
  • a gas bleed valve 15 which is used to evacuate undissolved gas from the medium, e.g. oil, in the primary reservoir 13.
  • a second pump 17 which during normal operation of the apparatus 11 is used to bring the medium in the high pressure part 72 of the hydraulic system 9 at the required high pressure e.g. 100-350 Bar cannot work if gas is sucked into the second pump 17.
  • the high pressure part 72 of the hydraulic system 9 is used via a first piston 19 to bring the medium at the primary reservoir 13 at a lower return pressure with a second piston 20 during normal operation of the system.
  • the hydraulic system 9 is connected via a first fluid connection 23 and a second fluid connection 21 to the testing apparatus 1 during testing.
  • the testing apparatus 1 is provided with connectors 25, 27 to connect to the apparatus 11.
  • the testing apparatus 1 is provided with a pressure measuring system 5 to over time measure the pressure in the medium and a flow rate measurement system 31 to over time measure a flow rate of medium flowing from the secondary reservoir 3 into the hydraulic system 9. Also a filter 29 to filter the medium is provided.
  • the first valve 33, second valve 35 and third valve 37 may be used to control the working of the testing apparatus 1.
  • Each of said valves 33, 35, 37 can be opened and closed independently from each other.
  • a further threshold pressure valve 80 is provided in a fluid connection bypassing the third valve 37.
  • the further threshold pressure valve 80 is an adjustable pressure valve.
  • step A the testing apparatus 1 is connected to the main circuit 50 of hydraulic system 9.
  • step B the primary reservoir 13 is completely filled.
  • step C after the primary reservoir 13 is completely filled, medium is pumped from the secondary reservoir 3 into the main circuit 50 to increase the pressure of the medium until a pressure equal to or larger than the threshold pressure is reached in the by pass circuit 60 so that the threshold pressure valve 62 opens.
  • step D the pumping of the medium is continued such that the threshold valve 62 remains open and said pumping is continued until a substantially constant flow rate of the medium pumped from the secondary reservoir 3 into the main circuit 50 is reached.
  • step E the flow rate of the medium pumped from the secondary reservoir 3 into the main circuit 50 is measured over time.
  • step F the presence of undissolved gas is determined on basis of the measured flow rate.
  • the presence of undissolved gas is determined on basis of the measured flow rate during the period from the opening of the threshold pressure valve 62 until the moment that a constant flow rate is reached. These measurements over time of the flow rate provide an indication of the presence of the undissolved gas in the by pass circuit 60.
  • the measured flow rate can be compensated for the compressibility of the hydraulic system being free from undissolved gas.
  • the measured flow rate can be compared with a reference flow rate.
  • the reference flow rate can be obtained by subjecting a reference hydraulic system being free from undissolved gas to the steps A-E.
  • the reference hydraulic system can be the hydraulic system 9 which is subjected to the method.
  • the figures 2-4 show different situations wherein the hydraulic system of fig. 1 is subjected to the method according the invention.
  • the horizontal axis indicates the time (t) and the vertical axis the measured flow rate (f) of the medium pumped from the secondary reservoir 3 into the main circuit 50.
  • the threshold pressure valve 62 opens at X.
  • a substantially constant flow rate is reached at Y.
  • Figure 2 shows a graph of the measured flow rate of medium pumped from the testing apparatus 1 into the hydraulic system 9 in the theoretical situation that the by pass circuit 60 would be endless stiff and would be absolutely free from undissolved gas.
  • hydraulic systems always have a certain degree of compressibility.
  • Figure 3 shows a graph of the measured flow rate of medium pumped from the testing apparatus into the hydraulic system in the situation that the by pass circuit is free from undissolved gas.
  • the peak in fig. 3 is caused by the compressibility of the by pass circuit. It is noted that a small part of the peak may be caused by the fact that the by pass circuit will not be absolutely free (100% free) from undissolved gas. As mentioned before, this if further neglected because the aim of the method is to determine whether the by pass circuit in practise would be considered as being free from undissolved gas.
  • the area A1 indicates the difference between the area under the graph during the period between X and Y when compared with the graph of fig 2 .
  • the area A1 therefore is considered to correspond with the compressibility of the by pass circuit 60.
  • Figure 4 shows a graph of the measured flow rate of medium pumped from the testing apparatus into the hydraulic system in the situation that the by pass circuit contains undissolved gas.
  • the area A2 indicates the difference between the area under the graph during the period between X and Y when compared with the graph of fig 2 .
  • the area A2 therefore corresponds with the compressibility of the by pass circuit 60 and the undissolved gas present in the by pass circuit 60.
  • the graph of fig. 4 is compensated for the compressibility of the by pass circuit 60 (for example by deducting A1 from A2), an indication of the amount of undissolved gas in the by pass circuit 60 is provided.
  • the data of the over time measured flow rate forms the reference flow rate.
  • the over time measured flow rate can be compared with said reference flow rate. If the over time measured flow rate and the reference flow rate are the same, there is no undissolved gas present in the by pass circuit 60 of the hydraulic system 9. If there are differences between the over time measured flow rate and the reference flow rate, there is undissolved gas present in the by pass circuit 60 of the hydraulic system 9. The degree of difference between the measured flow rate and reference flow rate provides an indication of the amount of undissolved gas in the by pass circuit 60.
  • the graphs of fig. 3 and 4 can be compared to determine whether there is undissolved gas present in the by pass circuit 60.
  • a difference between said graphs provide an indication that there is undissolved gas in the by pass circuit 60.
  • the period from the moment that the threshold pressure valve 62 opens (at X) until a constant flow rate is reached (at Y) of both graphs are compared.
  • the difference in the area under the graphs during said period provides an indication of the amount of undissolved gas in the by pass circuit 60.
  • the larger said area of fig. 4 is when compared with said area of fig. 3 , the more undissolved gas is present in the by pass circuit 60.
  • the medium is in step D pumped at a constant pressure equal to or larger than the threshold pressure into the main circuit 50, more specifically the medium is pumped at a predetermined constant pressure equal to or larger than the threshold pressure.
  • the hydraulic system 9 during normal operation comprises a low pressure part 71 and a high pressure part 72, the by pass circuit 60 is located in the high pressure part 72 and the method comprises pumping the medium of the secondary reservoir 3 into the high pressure part 72 upstream of the by pass circuit 60.
  • the testing apparatus 1 is connected to the main circuit 50 via a first fluid connection 23 located upstream of the by pass circuit 60 and a second fluid connection 21 located downstream of the by pass circuit 60.
  • the steps C and D comprise pumping the medium into the main circuit 50 only via the first fluid connection 23.
  • the second fluid connection 21 is used as a return flow of medium to the secondary reservoir 3.
  • the valves 33 is open and the valves 35 and 37 are closed.
  • the return flow passes the valve 37 via the further threshold pressure valve 80.
  • the primary reservoir 13 is a piston type reservoir and step B comprises filling the piston type reservoir until the piston reaches its end stop.
  • Step B comprises the sub steps of
  • the sub steps B1, and B3 comprise pumping the medium into the main circuit via the first fluid connection 23 and the second fluid connection 21.
  • the medium may be pumped into the main circuit 50 mainly via the second fluid connection 21.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)

Claims (18)

  1. Procédé pour déterminer la présence de gaz non dissout dans un système hydraulique comprenant un circuit principal (50) avec un réservoir principal (13) contenant un milieu, et un circuit de dérivation (60) relié au circuit principal et comportant une vanne de pression de seuil (62) qui s'ouvre à une pression de seuil, dans lequel le procédé comprend les étapes :
    A. de connexion d'un appareil de test (1) comprenant un réservoir secondaire (3) du milieu et une pompe (7) au circuit principal,
    B. de remplissage complet du réservoir principal (13),
    C. après le remplissage complet du réservoir principal (13), de pompage du milieu du réservoir secondaire (3) dans le circuit principal (50) pour augmenter la pression du milieu jusqu'à ce qu'une pression supérieure ou égale à la pression de seuil soit atteinte dans le circuit de dérivation de sorte que la vanne de pression de seuil (62) s'ouvre,
    D. de poursuite du pompage du milieu de sorte que la vanne de pression de seuil (62) reste ouverte et de poursuite dudit pompage jusqu'à ce qu'un débit sensiblement constant du milieu pompé du réservoir secondaire (3) dans le circuit principal (50) soit atteint,
    E. de mesure dans le temps du débit du milieu pompé du réservoir secondaire (3) dans le circuit principal (50), et
    F. de détermination de la présence de gaz non dissout sur la base du débit mesuré.
  2. Procédé selon la revendication 1, dans lequel l'étape E comprend la mesure dans le temps du débit du milieu pompé du réservoir secondaire (3) dans le circuit principal (50) pendant les étapes C et D.
  3. Procédé selon la revendication 1 ou 2, dans lequel, juste avant le commencement de l'étape C, la pression sur le milieu dans le système hydraulique est relâchée.
  4. Procédé selon l'une quelconque des revendications précédentes, dans lequel l'étape F comprend la compensation du débit mesuré pour la compressibilité du système hydraulique qui est exempt de gaz non dissout.
  5. Procédé selon l'une quelconque des revendications précédentes, dans lequel l'étape F comprend la comparaison du débit mesuré avec un débit de référence.
  6. Procédé selon la revendication 5, dans lequel l'étape F comprend la comparaison du débit mesuré avec le débit de référence d'un système hydraulique de référence qui est exempt de gaz non dissout et soumis aux étapes A à E.
  7. Procédé selon l'une quelconque des revendications précédentes, dans lequel, à l'étape D, le milieu est pompé à une pression constante supérieure ou égale à la pression de seuil dans le circuit principal (50).
  8. Procédé selon l'une quelconque des revendications précédentes, dans lequel le système hydraulique pendant un fonctionnement normal comprend une partie basse pression (71) et une partie haute pression (72), le circuit de dérivation (60) est situé dans la partie haute pression et le procédé comprend le pompage du milieu du réservoir secondaire (3) dans la partie haute pression en amont du circuit de dérivation.
  9. Procédé selon l'une quelconque des revendications précédentes, dans lequel l'appareil de test (1) est relié au circuit principal (50) par l'intermédiaire d'une première liaison de fluide (23) située en amont du circuit de dérivation (60) et d'une deuxième liaison de fluide (21) située en aval du circuit de dérivation.
  10. Procédé selon l'une quelconque des revendications précédentes, dans lequel les étapes C et D comprennent le pompage du milieu dans le circuit principal uniquement par l'intermédiaire de la première liaison de fluide (23).
  11. Procédé selon l'une quelconque des revendications précédentes, dans lequel, pendant les étapes C et D, la deuxième liaison de fluide (21) est utilisée en tant qu'écoulement de retour du milieu vers le réservoir secondaire (3).
  12. Procédé selon la revendication 11, dans lequel une vanne de pression de seuil (80) supplémentaire est prévue dans l'écoulement de retour du milieu vers le réservoir secondaire (3).
  13. Procédé selon l'une quelconque des revendications précédentes, dans lequel l'appareil de test comprend un système de mesure de débit (31) pour mesurer le débit du milieu pompé du réservoir secondaire (3) dans le circuit principal (50).
  14. Procédé selon l'une quelconque des revendications précédentes, dans lequel l'appareil de test comprend un système de mesure de pression (5) pour mesurer la pression du milieu pompé du réservoir secondaire (3) dans le circuit principal (50).
  15. Procédé selon l'une quelconque des revendications précédentes, dans lequel le réservoir principal (13) est un réservoir de type à piston et l'étape B comprend le remplissage du réservoir de type à piston jusqu'à ce que le piston atteigne sa butée d'extrémité.
  16. Procédé selon l'une quelconque des revendications précédentes, dans lequel l'étape B comprend les étapes secondaires :
    B1. de pompage du milieu du réservoir secondaire (3) dans le circuit principal (50) jusqu'à ce que le réservoir principal (13) soit complètement rempli,
    B2. de relâchement de la pression sur le réservoir principal,
    B3. de pompage du milieu du réservoir secondaire dans le circuit principal tout en mesurant dans le temps le volume et la pression du milieu pompé dans le circuit principal, et
    B4. de détermination de la présence de gaz non dissout dans le circuit principal en comparant le volume mesuré avec la pression mesurée.
  17. Procédé selon la revendication 16 et en combinaison avec la revendication 9, dans lequel les étapes secondaires B1 et B3 comprennent le pompage du milieu dans le circuit principal (50) par l'intermédiaire de la deuxième liaison de fluide (21).
  18. Procédé selon la revendication 16 ou 17 et en combinaison avec la revendication 9, dans lequel les étapes secondaires B1 et B3 comprennent le pompage du milieu dans le circuit principal (50) par l'intermédiaire de la première liaison de fluide (23).
EP13170090.8A 2012-06-04 2013-05-31 Procédé pour déterminer la présence de gaz non dissous dans un système hydraulique Active EP2672126B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2008927A NL2008927C2 (en) 2012-06-04 2012-06-04 Method for determining the presence of undissolved gas in a hydraulic system.

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EP2672126A1 EP2672126A1 (fr) 2013-12-11
EP2672126B1 true EP2672126B1 (fr) 2015-07-08

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9200995A (nl) * 1992-06-05 1994-01-03 Sun Electric Systems Bv Werkwijze en inrichting voor het detecteren van onopgelost gas in een hydraulisch besturingssysteem.
DE19603909B4 (de) * 1996-02-03 2006-02-16 Robert Bosch Gmbh Verfahren und Vorrichtung zur Überprüfung des Entlüftungszustandes einer hydraulischen Bremsanlage eines Fahrzeugs
EP2302270B1 (fr) * 2009-09-29 2012-09-12 Sun Test Systems B.V. Procédé pour déterminer le fonctionnement d'une soupape de purge de gaz

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NL2008927C2 (en) 2013-12-05

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