EP2493705B1 - Dispositif de détermination par capteurs d'une différence de pression dans une conduite de travail parcourue par de l'air comprimé - Google Patents

Dispositif de détermination par capteurs d'une différence de pression dans une conduite de travail parcourue par de l'air comprimé Download PDF

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Publication number
EP2493705B1
EP2493705B1 EP10795920.7A EP10795920A EP2493705B1 EP 2493705 B1 EP2493705 B1 EP 2493705B1 EP 10795920 A EP10795920 A EP 10795920A EP 2493705 B1 EP2493705 B1 EP 2493705B1
Authority
EP
European Patent Office
Prior art keywords
pressure
unit
working line
pressure difference
switch unit
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.)
Not-in-force
Application number
EP10795920.7A
Other languages
German (de)
English (en)
Other versions
EP2493705A1 (fr
Inventor
Janos TÓTH
Michael Muser
Kornél Kántor
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.)
Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Original Assignee
Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
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 Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH filed Critical Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Publication of EP2493705A1 publication Critical patent/EP2493705A1/fr
Application granted granted Critical
Publication of EP2493705B1 publication Critical patent/EP2493705B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/38—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by piston and cylinder
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/247—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow the switch being of the reed switch type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/34—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by diaphragm

Definitions

  • the present invention relates to a device for sensor-related determination of a pressure difference occurring between a first point and a second point arranged spaced therefrom in the flow direction in the region of a throttle inserted in a compressed-air-flowed working line.
  • the field of application of the present invention extends to fluidic application cases in which the presence of a flow of pressure medium in a line and its direction is to be determined in order to signal-process this information in a superordinate control unit.
  • Possible applications are, for example, tire pressure monitoring devices in which the pressurization of at least one air-sprung tire of a motor vehicle is controlled. In this case, the higher-level control needs information about the current pressure of the connected air-sprung tires to be determined by sensor technology.
  • other applications are conceivable, for example in pneumatic door actuation systems or in the field of internal combustion engine technology.
  • the DE 2 318 973 A1 discloses another device for sensor-related determination of a pressure difference, in which this pressure difference is used on both sides of a piston according to size and sign to obtain switching signals for a higher-level control.
  • the piston is arranged to be axially displaceable in a housing which forms a pressure chamber provided with a pressure medium connection on both sides of the piston displaceably mounted longitudinally against spring forces.
  • the piston is assigned for its two Verschiebraumen two spring arrangements, which are supported with their abutting first ends permanently on stops on the housing and with their second ends on the component mounted stop discs.
  • the abutment discs of the respective spring averted end faces are assigned depending on the system on the piston and the housing such that rest in a deviating from the end positions neutral position of the piston both stop discs on the associated systems on the piston and housing, while displacements of the piston the existing in the direction of the respective stop disc only on the associated system on the piston, however, the rear in the direction of the respective displacement stop disc rests only on the associated system on the housing.
  • the piston is provided with means for the position-dependent actuation of electrical switching means. As an electrical switching means two oppositely arranged tip switch are provided, the mutual actuation takes place via a Mit repertoire, which is mechanically connected to the piston of the differential pressure sensor.
  • a disadvantage of this prior art is the rather high number of components caused by the stop discs, compression springs, seals and the like.
  • the invention includes the technical teaching that the pressure at the first point in the flow direction before and at the second point in the flow direction - not at-but-branched off after the throttle to the pressure difference across the integrated throttle in the working line on both sides of a parallel thereto fed switched pressure balance unit.
  • the pressure compensator unit reports in cooperation with an electrical switch unit Parent control unit, a binary ventilation signal, if the pressure compensator unit detects a significant positive or negative pressure difference across the throttle, which serves within the scope of the device according to the invention in this respect as a kind of measuring throttle.
  • the advantage of the solution according to the invention is, in particular, that the special juxtaposition of measuring throttle to pressure compensator unit to electrical switch unit with few components can be easily implemented.
  • the existing pressure difference is converted into a position with the first pairing of metering restrictor to pressure compensating unit.
  • the pairing pressure compensator unit to electrical switch unit of the position thus generated is used as an actuating force for the electrical switch unit.
  • the electrical signal generated in this way on the basis of a pressure difference can be used to initiate and terminate applications based on compressed air flows in working lines.
  • the pressure compensator which is used to implement the measured pressure difference in a travel, preferably consists of a cylindrical housing with end pressure connections for connection to the first and second point before / after the throttle and contains a by the pressure difference axially and bidirectionally adjustable balance piston, which is dynamically sealed against the wall of the housing.
  • the balance piston For positioning the balance piston in a center differential position defined as differential pressure-free starting position, the balance piston is arranged on both sides of two spring elements, which come into abutment with the end respectively applied to the balance piston on the front sides of the housing.
  • two opposite the balance piston and acted upon by spring forces pressure chambers are created.
  • Such a pressure balance unit is simple and robust and consists of the above-mentioned few individual components.
  • the pressure compensating unit interact with the electrical switch unit via mechanical coupling means.
  • the actuating plunger can either be part of the balance piston or part of the switch unit.
  • the electrical switch unit can be formed as a conventional multi-pole toggle switch, which is available as a standard component.
  • the balance piston is disposed between two elastomeric membranes, each delimiting a pressure chamber, which is connected to the first and second position of the throttle.
  • the distal end of the actuating plunger acts together with a radial recess on the balance piston for switch actuation.
  • the elastomeric material of the elastomeric membranes is made so thick that, in the case of a pressure equilibrium, ie in the absence of pressure difference, the neutral center position is established without the need for additional spring elements.
  • the electrical switch unit is preferably equipped with three switch positions and signals the superordinate-preferably electronic-control unit in the said middle position of the balance piston no pressure requirement. If, on the other hand, one of the end stop positions of the balance piston, on the left or the right side, is assumed, this can be used to indicate a ventilation requirement or ventilation requirement. As a result, a 3 / n-valve function can be implemented. A 2/2-valve function can be realized from the sum of the available possibilities by signaling only the neutral middle position as the final position and the ventilation demand or ventilation requirement.
  • the working line equipped with the device according to the invention for sensor-related determination of a differential pressure can be acted upon by an electropneumatic valve with compressed air on the input side in order to fill a preferably closed container at the end.
  • the device according to the invention determines whether compressed air flows into the container and when a flow compensation occurs and reports a corresponding electrical signal to the higher-order control unit, which in turn controls the control valve.
  • the electronic control unit can be given a desired pressure level manually or automatically. This example of application can be used when filling air-sprung tires of a motor vehicle, the filling of boiler-like compressed air storage tanks and the like.
  • FIG. 1 flows from a - here only schematically indicated - electropneumatic control valve 1 a compressed air flow through a working line 2 in a likewise only schematically indicated - closed container 3, which is to be filled with the compressed air.
  • a working line 2 In the working line 2 is an effective flow cross-section narrowing Throttle 4 inserted.
  • Throttle 4 At a first point 5a in front of the throttle 4 and a second point 5b after the throttle 4 is at the flow through the working line 2 with compressed air to a different high pressure.
  • a parallel to the throttle 4 connected pressure compensating unit 6 determines the pressure difference resulting from the different pressures at the first point 5a and the second point 5b, in which the said pressures are diverted from the working line 2.
  • the pressure compensator 6 consists essentially of a cylindrical housing 7 with each end face-side pressure connections for connection to the first and second points 5a and 5b of the working line 2.
  • an axially bidirectionally adjustable balance piston 8 is integrated within the housing 7.
  • the balance piston 8 is by applying two oppositely acting thereon spring elements 9a and 9b in the differential pressure initial state in the middle position shown.
  • the pressure compensator unit 6 cooperates via this embodiment via magnetic coupling means with an electrical switch unit 10 positioned close to it.
  • an electrical switch unit 10 As a magnetic coupling means of the balance piston 8 here consists of a permanent magnet, whereas the hereby cooperating electrical switch unit 10 is formed as an inductive reed switch. Detects the pressure compensating unit 6 depending on the direction of flow of the working line 2 a significant positive or negative pressure difference across the throttle 4, this sensor-detected event can be reported via the electrical switch unit 10 to a higher-level control unit 11, which depends on predetermined control values and the determined pressure difference value the electro-pneumatic control valve 1 drives.
  • a balance piston 8 'between two elastomeric membranes 12a and 12b is arranged, each having a pressure chamber 13a and 13b limit, which is connected to the - not shown - first or second position of the working line, analogous to the embodiment described above.
  • actuating a balance piston 8 'associated electrical switch unit 10' is a mechanical coupling means which comes as an actuating plunger 14 with a corresponding radial recess 15 on the balance piston 8 'for engagement.
  • the axial movement of the balance piston 8 'generated due to the pressure difference thus leads to a tilting switching of the actuating plunger 14 of the electrical switching unit 10' to the purpose already mentioned in connection with the above description of the first embodiment.
  • the invention is not limited to the two preferred embodiments described above. On the contrary, modifications are conceivable which are included in the scope of protection of the following claims.
  • the device according to the invention for sensor-related determination of a pressure difference for a purpose other than for pressurizing a closed container.
  • Particularly advantageous is the use in connection with a tire pressure monitoring device for air-sprung tires of a motor vehicle.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Measuring Fluid Pressure (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)

Claims (9)

  1. Dispositif de détermination par une technique de capteur d'une différence de pression se produisant entre un premier point (5a) et un deuxième point (5b) disposé à distance de celui-ci dans le sens du courant dans la partie d'un étranglement inséré dans un conduit (2) de travail, la pression étant dérivée au premier point (5a) avant, dans le sens du courant, et au deuxième point (5b) après, dans le sens du courant, l'étranglement (4) pour envoyer la différence de pression sur l'étranglement (4) de part et d'autre d'une unité (6; 6') de bascule manométrique montée à cet effet en parallèle, envoyant, en coopération avec une unité (10; 10') de commutation électrique d'une unité (11) de commande supérieure hiérarchiquement, un signal si l'unité (6; 6') de bascule manométrique détecte sur l'étranglement (4) une différence de pression positive ou négative significative, caractérisé en ce que l'unité (6; 6') de bascule manométrique de constatation de la différence de pression positive ou négative dans le conduit (2) de travail parcouru par de l'air comprimé est constituée d'un boîtier (7) cylindrique ayant des raccords de pression du côté frontal pour le raccordement au premier et au deuxième points (5a, 5b) du conduit (2) de travail, qui contient un piston (8) de bascule réglable bidirectionnellement axialement par la différence de pression, piston qui, pour le positionnement, est disposé en une position médiane, comme position initiale sans différence de pression, de part et d'autre de deux éléments (9a, 9b) à ressort, le signal envoyé à l'unité (11) de commande supérieure hiérarchiquement étant un signal binaire d'alimentation en air ou de purge d'air.
  2. Dispositif suivant la revendication 1,
    caractérisé en ce que la coopération de l'unité (10; 10') de commutation électrique avec l'unité (6, 6') de bascule manométrique s'effectue par un moyen d'accouplement mécanique ou magnétique.
  3. Dispositif suivant la revendication 2,
    caractérisé en ce que, comme moyen d'accouplement magnétique, un aimant permanent formant le piston (8) de bascule coopère avec l'unité (10) de commutation constituée sous la forme d'un commutateur reed inductif.
  4. Dispositif suivant la revendication 2,
    caractérisé en ce qu'il est prévu, comme moyen d'accouplement mécanique, un poussoir (14) d'actionnement reliant le piston (8') de bascule à l'unité (10') de commutation.
  5. Dispositif suivant la revendication 4,
    caractérisé en ce que le piston (8') de bascule est, pour la commutation basculante du poussoir (14) d'actionnement de l'unité (10') de commutation, disposé entre deux membranes (12a; 12b) en élastomère, qui délimite respectivement un espace (13a; 13b) de pression, qui communique avec le premier ou le deuxième point (5a; 5b) du conduit (2) de travail.
  6. Dispositif suivant la revendication 1,
    caractérisé en ce que l'extrémité distale du poussoir (14) d'actionnement de l'unité (10') de commutation électrique vient en prise dans un évidement (15) radial correspondant du piston (8') de bascule.
  7. Dispositif suivant la revendication 1,
    caractérisé en ce que l'unité (10; 10') de commutation électrique a trois points de commutation et l'unité (11) de commande signale qu'il n'y a pas besoin de pression en une position médiane correspondant à la position médiane du piston (8; 8') de bascule, tandis que les positions de butée d'extrémité présentes de part et d'autre signalent un besoin d'alimentation en air ou un besoin de purge d'air.
  8. Dispositif suivant la revendication 1,
    caractérisé en ce que le conduit (2) de travail est alimenté en pression par une soupape (1) de commande électropneumatique à partir d'au moins un réservoir (3) fermé.
  9. Dispositif suivant la revendication 8,
    caractérisé en ce que le réservoir (3) fermé est constitué par un pneumatique à suspension d'air d'un véhicule automobile ou par un réservoir d'accumulation d'air comprimé de type en cuve.
EP10795920.7A 2009-10-30 2010-10-29 Dispositif de détermination par capteurs d'une différence de pression dans une conduite de travail parcourue par de l'air comprimé Not-in-force EP2493705B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009051406A DE102009051406A1 (de) 2009-10-30 2009-10-30 Vorrichtung zur sensortechnischen Ermittlung einer Druckdifferenz in einer druckluftdurchströmten Arbeitsleitung
PCT/EP2010/006629 WO2011050983A1 (fr) 2009-10-30 2010-10-29 Dispositif de détermination par capteurs d'une différence de pression dans une conduite de travail parcourue par de l'air comprimé

Publications (2)

Publication Number Publication Date
EP2493705A1 EP2493705A1 (fr) 2012-09-05
EP2493705B1 true EP2493705B1 (fr) 2015-07-15

Family

ID=43734315

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10795920.7A Not-in-force EP2493705B1 (fr) 2009-10-30 2010-10-29 Dispositif de détermination par capteurs d'une différence de pression dans une conduite de travail parcourue par de l'air comprimé

Country Status (5)

Country Link
EP (1) EP2493705B1 (fr)
CN (1) CN102596598B (fr)
DE (1) DE102009051406A1 (fr)
RU (1) RU2545177C2 (fr)
WO (1) WO2011050983A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018208755A1 (de) * 2018-06-04 2019-12-05 Zf Friedrichshafen Ag Druckregelventil
CN108730245A (zh) * 2018-07-02 2018-11-02 尹财富 一种液压循环系统
AU2020261288B2 (en) * 2019-04-23 2023-01-19 Hendrickson Usa, L.L.C. Tire inflation system with parallel flow path

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2117149A5 (fr) * 1970-12-03 1972-07-21 Facem Fabbrica Apparecch
DE2318973A1 (de) 1973-04-14 1974-10-24 Volkswagenwerk Ag Differenzdruckschalter
EP0003188A1 (fr) 1978-01-11 1979-07-25 SAUNIER DUVAL - Société Anonyme Manocontact à différentielle réglable pour système de contrôle et de sécurité du débit d'air nécessaire à la combustion d'un brûleur à gaz
DE2928802C2 (de) * 1979-07-17 1985-05-30 Wabco Westinghouse Fahrzeugbremsen GmbH, 3000 Hannover Druckmittelbetätigter Differenzdruckschalter
GB2239076A (en) * 1989-12-14 1991-06-19 Lawrence Patrick Lonergan Building services water supply programmable isolation and malfunction indication system
SU1809661A1 (ru) * 1991-01-03 1996-04-27 Научно-исследовательский технологический институт Дифманометр-расходомер жидкости
RU2052674C1 (ru) * 1991-12-09 1996-01-20 Евгений Алексеевич Шутков Способ индикации отказа на контролируемом участке последовательной гидравлической цепи
DE4226941A1 (de) 1992-08-14 1994-02-17 Teves Gmbh Alfred Differenzdruckschalter
AU7455700A (en) * 1999-09-20 2001-04-24 Won Bae Lee Gas safety valve
US6363963B1 (en) * 2000-08-25 2002-04-02 William C. White Excess flow shutoff valve
JP2008189463A (ja) * 2007-01-11 2008-08-21 Mitsubishi Electric Corp 油圧エレベータ装置

Also Published As

Publication number Publication date
CN102596598B (zh) 2015-04-29
RU2545177C2 (ru) 2015-03-27
RU2012122165A (ru) 2013-12-10
WO2011050983A1 (fr) 2011-05-05
DE102009051406A1 (de) 2011-05-05
CN102596598A (zh) 2012-07-18
EP2493705A1 (fr) 2012-09-05

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