EP1069312A1 - Verfahren und Vorrichtung zum Auswerten eines hydraulischen Systems - Google Patents

Verfahren und Vorrichtung zum Auswerten eines hydraulischen Systems Download PDF

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Publication number
EP1069312A1
EP1069312A1 EP00202417A EP00202417A EP1069312A1 EP 1069312 A1 EP1069312 A1 EP 1069312A1 EP 00202417 A EP00202417 A EP 00202417A EP 00202417 A EP00202417 A EP 00202417A EP 1069312 A1 EP1069312 A1 EP 1069312A1
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EP
European Patent Office
Prior art keywords
pump
outlet
leak
hydraulic
inlet
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.)
Withdrawn
Application number
EP00202417A
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English (en)
French (fr)
Inventor
Klaus Leonhard Witt
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.)
Sun Test Systems BV
Original Assignee
Sun Electric Systems BV
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Filing date
Publication date
Application filed by Sun Electric Systems BV filed Critical Sun Electric Systems BV
Publication of EP1069312A1 publication Critical patent/EP1069312A1/de
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B51/00—Testing machines, pumps, or pumping installations

Definitions

  • the invention relates to a method for determining of a hydraulic system, comprising the combination of a hydraulic excitation pump with an external pump leak outlet and a hydraulic operating circuit connected thereto at least one of the following quantities: pump loss and leakage flow in the excited hydraulic circuit, as well as to a device for effecting such a method.
  • the invention aims to provide a method and a device for executing the method as defined hereinabove by means of which the quantities which are of importance for judging the state of a hydraulic system can be determined without the necessity to remove the pump or to use a volume flow meter which must satisfy two, mutually contrary, requirements.
  • the invention furthermore relates to a device for effecting the method as described hereinabove, such as defined in the claims 3-5.
  • the invention is thus based on the insight that the hydraulic fluid (of which the properties must be known) is used as information bearer using the thermodynamic processes such as occuring at the pump.
  • thermodynamic interrelations pump loss and system leakage are determined. This interrelations are described in the publications of the inventor (Dr. Ing. K. Witt) in “ ⁇ lhydraulik und Pneumatik”, 1976-1977, combined in the publication “Thermodynamisches Messe” in der ⁇ lhydraulik” (published by the “Instituut voor Aandrijftechniek", TU Eindhoven), particularly 21(1977) no. 3, page 162.
  • the method and device according to the invention have the important advantage that the implementation thereof requires only three temperature sensors (at the pump inlet, at the pump outlet and at the pump leakage outlet) and, starting from the presumption that both the pressure at the inlet respectively the pressure at the leakage outlet are equal to the pressure of the surrounding air, only one extra pressure sensor.
  • the necessary volume flow meter connected to the pump leakage outlet must only be able to show only a small flow. Finaly only a two-way valve with a connection to the pump inlet, or a simple shut-off valve connected to the pump leakage outlet are required.
  • Registration of temperature and pressure and measuring the pump leakage flow can be done before and after the starting up and shutting down respectively of a hydraulic installation. More particular this means that, when method and device are used in a system such as a hydraulic aircraft system, the state thereof can be monitored permanently and the result of this monotoring action can be stored. This results into a "case history" and at each moment one has an insight in the state of the installation as it is, without the necessity of any removal of any component.
  • Fig. 1a shows a hydraulic system with a storage tank 2, filled with a hydraulic fluid of which the physical properties are exactly known. Via the conduit 4 this tank is connected to the inlet 6 of a hydraulic pump 8, of which the shaft 10 is driven by a driving motor, not shown.
  • the outlet 12 of the pump 6 is via the conduit 14 connected to a hydraulic system which is schematically indicated by the broken lines 16, and which is for instance an aircraft system as known as in itself with, for instance, various actuators driving the flight controls.
  • the pump 8 has, as known in itself, a pump leak outlet 18 which is connected via a volume flow meter 20 - which needs only be able to show a small flow - to the inlet 22 of the two-way valve 24.
  • This two-way valve 24 has two outlets: the first, 26, is connected via the conduit 28 to the pump inlet 6 (and more particularly the position where the temperature (T1) of the inlet medium is measured) and the second, 30, leads via the conduit 32 to the system return conduit 33 which ends in the tank 2.
  • a non-return valve 29 can be inserted which opens in the direction of the pump inlet. In that case the part 28a of the conduit is omitted.
  • Fig. 1b shows a diagram which closely resembles the one of fig. 1a, but here the volume flow meter 20 is not connected to a two-way valve, but to a simple shut-off valve 25.
  • the shut-off valve 25 When the shut-off valve 25 is closed the pump 8 operates as a pump without external leak outlet - there are hydraulic pumps, particularly the ones used in hydraulic aircraft installations, which can be operated with a closed leak outlet for a short time.
  • the pump leak outlet is connected to the pump inlet 6 via conduit 31 and the non-return valve 28', thus behind the volume flow meter 20.
  • Fig. 2a shows the situation in which the pump leak outlet 18 is connected, via the two-way valve 24, with the system return conduit 32.
  • h2'* is determined by drawing, starting from the point 2* in the diagram of fig. 1a (which relates to T2* and P2*) a line perpendicular to the horizontal (entropy) axis, thus a line representing points of equal entropy, determining the intersection of this line with the line of constante pressure (Pa), corresponding with poin 1. This intersection, indicated with 2'*, is then the required value of the enthalpy h2'*.
  • a second measurement is effected with the pump outlet 8 connected to the return conduit of the system; this is the situation during the normal use of a hydraulic system, be it with the addition that now in the connection between the pump leak outlet 18 and the return conduit 33 a volume flow meter is connected.
  • Fig. 2a and the entropy-enthalpy diagram according to fig. 2b relate to this situation: the leak outlet 18 of the pump 8 is connected directly via conduit 32 to the return conduit 33. It is known that in such a case the pump efficiency ⁇ T is given by the following equation:
  • Equation (2) further comprises the following quantities:
  • the two equations (1) and (2) respectively are, in fact, two equations with two unknown factors: ⁇ T on the one hand and M s on the other hand.
  • M S M L ⁇ T (h 3 -h 1 ) (h 2 -h 2 ') ⁇ T (h 2 -h 1 )
  • ⁇ T is known from (1) and can thus be introduced in equation (3).
  • This value of the system leak yields information about the state of the hydraulic system when excited by the pump.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Examining Or Testing Airtightness (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
EP00202417A 1999-07-15 2000-07-07 Verfahren und Vorrichtung zum Auswerten eines hydraulischen Systems Withdrawn EP1069312A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1012606A NL1012606C2 (nl) 1999-07-15 1999-07-15 Werkwijze en inrichting voor het evalueren van een hydraulisch systeem.
NL1012606 1999-07-15

Publications (1)

Publication Number Publication Date
EP1069312A1 true EP1069312A1 (de) 2001-01-17

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Family Applications (1)

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EP00202417A Withdrawn EP1069312A1 (de) 1999-07-15 2000-07-07 Verfahren und Vorrichtung zum Auswerten eines hydraulischen Systems

Country Status (2)

Country Link
EP (1) EP1069312A1 (de)
NL (1) NL1012606C2 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101545481B (zh) * 2009-05-07 2011-11-30 武汉大学 一种多功能泵系统试验台及其调节方法
WO2013063262A1 (en) * 2011-10-25 2013-05-02 Hydrotech, Inc Pump monitoring device
CN104110357A (zh) * 2013-04-22 2014-10-22 株式会社神户制钢所 气体压缩机及磨损状态判断方法
CN104533776A (zh) * 2014-12-09 2015-04-22 广东精铟机械有限公司 海上石油平台液压泵测试小车
CN108661891A (zh) * 2018-05-09 2018-10-16 浙江工业大学 一种低成本隔膜计量泵隔膜破损泄漏检测方法
US10466135B2 (en) 2016-11-08 2019-11-05 Iot Diagnostics Llc Pump efficiency of a fluid pump
CN113758649A (zh) * 2020-06-01 2021-12-07 广州汽车集团股份有限公司 液控系统液压油泄漏测试方法及系统
CN114585825A (zh) * 2019-10-15 2022-06-03 舍弗勒技术股份两合公司 用于控制液压单元、特别是控制用于机动车辆的传动系的液压单元的方法、液压单元以及具有液压单元的传动系

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110185606B (zh) * 2019-06-17 2020-06-02 中国民航大学 一种飞机液压泵性能测试试验台

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2557044A1 (de) * 1975-09-27 1977-06-23 Werner Dipl Ing Hoefflinger Vorrichtung zur thermodynamischen wirkungsgradmessung an hydrostatischen verdraengermaschinen
FR2372422A1 (fr) * 1976-11-30 1978-06-23 Hofflinger Werner Appareil de mesure du rendement de dispositifs hydrostatiques
US5628229A (en) * 1994-03-31 1997-05-13 Caterpillar Inc. Method and apparatus for indicating pump efficiency

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2557044A1 (de) * 1975-09-27 1977-06-23 Werner Dipl Ing Hoefflinger Vorrichtung zur thermodynamischen wirkungsgradmessung an hydrostatischen verdraengermaschinen
FR2372422A1 (fr) * 1976-11-30 1978-06-23 Hofflinger Werner Appareil de mesure du rendement de dispositifs hydrostatiques
US5628229A (en) * 1994-03-31 1997-05-13 Caterpillar Inc. Method and apparatus for indicating pump efficiency

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WITT K.: "Thermodynamisches Messen in der Ölhydraulik", ÖLHYDRAULIK UND PNEUMATIK, vol. 20, no. 3 e.v., 1 September 1976 (1976-09-01) - 1 January 1978 (1978-01-01), Mainz, pages 20.603 - 22.36, XP002131924 *

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101545481B (zh) * 2009-05-07 2011-11-30 武汉大学 一种多功能泵系统试验台及其调节方法
US9140255B2 (en) 2011-10-25 2015-09-22 Hydrotech, Inc. Pump monitoring device
WO2013063262A1 (en) * 2011-10-25 2013-05-02 Hydrotech, Inc Pump monitoring device
US10119537B2 (en) 2011-10-25 2018-11-06 Iot Diagnostics Llc Pump monitoring device
US9275536B2 (en) 2011-10-25 2016-03-01 Hydrotech, Inc. Pump monitoring device
CN104110357B (zh) * 2013-04-22 2016-10-26 株式会社神户制钢所 气体压缩机及磨损状态判断方法
JP2014214607A (ja) * 2013-04-22 2014-11-17 株式会社神戸製鋼所 ガス圧縮機及び摩耗状態判定方法
EP2796719A1 (de) * 2013-04-22 2014-10-29 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Gasverdichter und Bestimmungsverfahren für den Verschleißzustand desselben
CN104110357A (zh) * 2013-04-22 2014-10-22 株式会社神户制钢所 气体压缩机及磨损状态判断方法
US10288062B2 (en) 2013-04-22 2019-05-14 Kobe Steel, Ltd. Gas compressor and abrasion state determining method
CN104533776A (zh) * 2014-12-09 2015-04-22 广东精铟机械有限公司 海上石油平台液压泵测试小车
US10466135B2 (en) 2016-11-08 2019-11-05 Iot Diagnostics Llc Pump efficiency of a fluid pump
US11092508B2 (en) 2016-11-08 2021-08-17 Iot Diagnostics Llc Pump efficiency of a fluid pump
CN108661891A (zh) * 2018-05-09 2018-10-16 浙江工业大学 一种低成本隔膜计量泵隔膜破损泄漏检测方法
CN108661891B (zh) * 2018-05-09 2019-07-30 浙江工业大学 一种低成本隔膜计量泵隔膜破损泄漏检测方法
CN114585825A (zh) * 2019-10-15 2022-06-03 舍弗勒技术股份两合公司 用于控制液压单元、特别是控制用于机动车辆的传动系的液压单元的方法、液压单元以及具有液压单元的传动系
US12018747B2 (en) 2019-10-15 2024-06-25 Schaeffler Technologies AG &Co. KG Method for controlling a hydraulic unit in particular for a drivetrain of a motor vehicle, hydraulic unit and drivetrain with hydraulic unit
CN113758649A (zh) * 2020-06-01 2021-12-07 广州汽车集团股份有限公司 液控系统液压油泄漏测试方法及系统

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Publication number Publication date
NL1012606C2 (nl) 2001-01-16

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