EP3564089A1 - Unité de commande oléohydraulique pour la commande des commutateurs de chemin de fer et procédé pour effectuer un contrôle de sécurité sur une unité de commande oléohydraulique - Google Patents

Unité de commande oléohydraulique pour la commande des commutateurs de chemin de fer et procédé pour effectuer un contrôle de sécurité sur une unité de commande oléohydraulique Download PDF

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Publication number
EP3564089A1
EP3564089A1 EP18305551.6A EP18305551A EP3564089A1 EP 3564089 A1 EP3564089 A1 EP 3564089A1 EP 18305551 A EP18305551 A EP 18305551A EP 3564089 A1 EP3564089 A1 EP 3564089A1
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EP
European Patent Office
Prior art keywords
oil
control unit
hydraulic control
pressure
hydraulic
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
EP18305551.6A
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German (de)
English (en)
Other versions
EP3564089B1 (fr
Inventor
Stefano Bittoni
Andrea BORROMEI-COLOZZI
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.)
Alstom Ferroviaria SpA
Original Assignee
Alstom Ferroviaria SpA
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Publication date
Application filed by Alstom Ferroviaria SpA filed Critical Alstom Ferroviaria SpA
Priority to EP18305551.6A priority Critical patent/EP3564089B1/fr
Priority to RU2019113324A priority patent/RU2019113324A/ru
Publication of EP3564089A1 publication Critical patent/EP3564089A1/fr
Application granted granted Critical
Publication of EP3564089B1 publication Critical patent/EP3564089B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
    • B61L5/04—Fluid-pressure devices for operating points or scotch-blocks
    • B61L5/045—Fluid-pressure devices for operating points or scotch-blocks using electrically controlled fluid-pressure operated driving means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L1/00—Devices along the route controlled by interaction with the vehicle or train
    • B61L1/20—Safety arrangements for preventing or indicating malfunction of the device, e.g. by leakage current, by lightning

Definitions

  • the present invention concerns an oil-hydraulic control unit for controlling railway switches of a railway track and a method for performing a safety check on an oil-hydraulic control unit.
  • a switch includes two blades lying between diverging outer rails (the stock rails). The switch can be moved laterally into one of two positions to direct a train coming from the blades toward a straight path or a diverging path.
  • the blades can be moved together one with respect to the other between two extreme positions.
  • a blade In the so called normal position, a blade is in contact with the rail directly adjacent to said blade and the other blade is spaced apart from the rail adjacent thereto. In this case, a train keeps a straight travel.
  • a blade In the so called reverse position, a blade is in a position adhering to the associated rail and the other blade is spaced apart from the rail adjacent thereto. In this case, a train would be diverged from the straight direction into a lateral branch.
  • Prior art switches are commonly provided with sensors used for verifying that the blades have reached the proper normal or reverse position at the end of each maneuver. These sensors are usually monitoring contacts arranged for closing monitoring circuits so that monitoring signals are generated. The monitoring signals are finally transmitted or read by a remote control unit which controls the switch operations.
  • Oil-hydraulic actuators have been used in the last years in switches for moving the blades, and they are controlled by oil-hydraulic control units.
  • the oil-hydraulic actuators receive pressurized oil from the oil-hydraulic control unit through a hydraulic circuit.
  • a common oil-hydraulic control unit comprises a pump and a device to direct the flood of oil.
  • Prior art discloses also a reversible pump for feeding the hydraulic circuit of the switch thus allowing displacement of the blades from a normal to a reverse position and vice versa through the actuators.
  • the reversible pump is actuated by an electric motor controlled from the remote control unit.
  • SIL-4 level Safety Integrity Level
  • the remote control unit allows the passage of the train.
  • FIG. 1 shows a block diagram of an oil-hydraulic control unit 1 of the above-disclosed type connected to a remote control unit 2 arranged for sending to the oil-hydraulic control unit 1 an activation signal for moving the blades of a switch in a predetermined position (normal or reverse) in order to control the switch operations.
  • the oil-hydraulic control unit 1 comprises an electric motor 4 arranged for controlling a pump 6 arranged in turn for sending oil to a pressure regulation unit 8, this oil being usually stocked in a reservoir (not showed) placed within the oil-hydraulic control unit 1.
  • the pressure regulation unit 8 is arranged for pressuring the oil and sending it to a switch 10.
  • the oil-hydraulic control unit 1 further comprises a timing unit 12, in particular a cylinder, connected to the pressure regulation unit 8 and arranged for cutting the power to the electric motor 4 when the switch operation has finished, and for closing control contacts 14 so that corresponding control signals are sent to the remote control unit 2 indicating that the oil-hydraulic control unit 1 has correctly ended its operations, regardless to the correct position of blades, which will be monitored by actuators.
  • a timing unit 12 in particular a cylinder
  • the above disclosed system is based on an hydraulic system to pilot the switch 10.
  • the pressure regulation unit 8 increases the hydraulic pressure in the hydraulic circuit feeding the switch 10 in order to move the actuators of the switch 10, and therefore its blades, so as to reach a final desired position.
  • the hydraulic system makes the pressure in the hydraulic circuit increase until the timing unit 12 cuts the power to the electric motor 4 and switches the control contacts 14.
  • One object of the present invention is therefore to provide an oil-hydraulic control unit which is capable to guarantee a safety functioning of a driven switch with a high level of safety and to limit the risks of errors.
  • a further object of the present invention is to provide an innovative method for performing a reliable safety check on an oil-hydraulic control unit.
  • an oil-hydraulic control unit having the characteristics defined in claim 1 and by a method for performing a safety check on an oil-hydraulic control unit having the characteristics defined in claim 6.
  • FIG. 2 shows a block diagram of an oil-hydraulic control unit 1' according to the present invention, wherein element similar to those of the oil-hydraulic control unit of the prior art above disclosed have been indicated with the same reference numbers.
  • the oil-hydraulic control unit 1' of the present invention includes, in the pressure regulation unit 8, a valve module 16 which comprises a plurality of redundancy relief valves disclosed in detail herein below.
  • FIG 3 shows a schematic enlarged figure of the oil-hydraulic control unit 1' of figure 2 wherein same references have been used to identify blocks representing the above-cited components.
  • the hydraulic circuit of the switch 10 is built with pressurized modular exits and in figure 3 four blocks 18 correspond to respective hydraulic canals connecting the oil-hydraulic control unit 1' to actuators of the switch 10 generally indicated with reference number 20.
  • Each actuator or group of actuators of the switch 10 requires advantageously in a manner per se known two canals or lines for being operated, each canal acting as inlet or outlet depending on the movement of the actuator.
  • Each canal block 18 comprises a first relief valve 16a and a second relief valve 16b which, altogether, represent the valve module 16 of the pressure regulation unit 8.
  • the two valves 16a, 16b are arranged in parallel on a same canal.
  • the relief valves 16a, 16b are configured to ensure that the level of pressure at system level increases until it reaches a calibrating value of the relief valves 16a, 16b.
  • the relief valves 16a, 16b are per se known and they are arranged so that when one valve 16a or 16b breaks, the other valve 16b or 16a starts sending the oil flowing in the canal towards the reservoir so that the pressure of the oil going to the actuators 20 decreases.
  • the remote control 2 cannot identify breakage of the valve 16a or 16b, and if also the other valve 16b or 16a breaks, the pressure of the oil going to the actuators increases, the actuators 20 are activated and the remote control 2 cannot recognize failure of the oil-hydraulic control unit 1'.
  • the relief valves 16a and 16b are arranged so that when the first valve 16a or 16b breaks and the oil starts going towards the reservoir, the internal pressure of the oil-hydraulic control unit 1' start decreasing thus not being able to reach a predetermined minimum value corresponding to the calibrating value of the relief valves 16a, 16b. If the internal pressure of the oil-hydraulic control unit 1' does not reach the calibrating value, the timing unit 12 is not activated, therefore, it does not cut off the power to the electric motor 4 and it does not close the closing contacts 14. The remote control unit 2 does not therefore receive the control signals, thus recognizing that a valve 16a or 16b has been damaged.
  • Each pressurized exit of the hydraulic circuit thanks to the redundancy of the relief valves 16a, 16b, is responsible for moving the external actuators at a specific and controlled pressure value.
  • the maximum pressure achieved by the respective canal, and therefore by the overall system is lower than the pressure needed to maneuver the blades.
  • the control contacts 14 are therefore not closed and the corresponding control signal is not sent to the remote control unit 2.
  • the remote control unit 2 can therefore detect a failure in the oil-hydraulic control unit 1'.
  • the remote control unit 2 is configured to detect that a relief valve 16a, 16b has been damaged if the activation signal has been sent to the switch 10 and, after a predetermined time starting from the sending of said activation signal, no control signals have been received back.
  • figure 4 shows a block diagram of such a method.
  • a first step 100 an oil-hydraulic control unit 1 as above disclosed is provided. Then, in a step 102, oil is sent into the hydraulic circuit at a very low level of pressure.
  • the blades are moved by the actuators 20 until they reach an obstacle thus stopping their movement.
  • the value of the oil pressure into the hydraulic circuit starts increasing until it reaches the calibrating value, i.e. a predetermined first threshold value set by the relief valves 16a, 16b.
  • the second relief valve 16b keeps, at a step 108, the pressure lower than the predetermined first threshold value, therefore, the level of pressure inside the hydraulic circuit cannot increase anymore, so it can never reach a second threshold value set by a cylinder valve of the timing unit 12.
  • the second threshold value is equal to the first threshold value.
  • the timing unit 12 remains inactive because the cylinder valve remains closed; as a result, the timing unit 12 does not cut the power to the electric motor 4 and does not close the control contacts 14, thus allowing the remote control unit 2 to detect, at step 112, failure of the oil-hydraulic control unit 1', thus performing a safety check.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Fluid-Pressure Circuits (AREA)
EP18305551.6A 2018-05-02 2018-05-02 Unité de commande oléohydraulique pour la commande des commutateurs de chemin de fer et procédé pour effectuer un contrôle de sécurité sur cette unité de commande oléohydraulique Active EP3564089B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP18305551.6A EP3564089B1 (fr) 2018-05-02 2018-05-02 Unité de commande oléohydraulique pour la commande des commutateurs de chemin de fer et procédé pour effectuer un contrôle de sécurité sur cette unité de commande oléohydraulique
RU2019113324A RU2019113324A (ru) 2018-05-02 2019-04-30 Масляный гидравлический блок управления стрелками железнодорожного пути и способ выполнения проверки безопасности на масляном гидравлическом блоке управления

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18305551.6A EP3564089B1 (fr) 2018-05-02 2018-05-02 Unité de commande oléohydraulique pour la commande des commutateurs de chemin de fer et procédé pour effectuer un contrôle de sécurité sur cette unité de commande oléohydraulique

Publications (2)

Publication Number Publication Date
EP3564089A1 true EP3564089A1 (fr) 2019-11-06
EP3564089B1 EP3564089B1 (fr) 2022-08-31

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EP18305551.6A Active EP3564089B1 (fr) 2018-05-02 2018-05-02 Unité de commande oléohydraulique pour la commande des commutateurs de chemin de fer et procédé pour effectuer un contrôle de sécurité sur cette unité de commande oléohydraulique

Country Status (2)

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EP (1) EP3564089B1 (fr)
RU (1) RU2019113324A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019133552A1 (de) * 2019-12-09 2021-06-10 Deutsche Bahn Ag Überwachungsverfahren für einen elektrohydraulischen weichenantrieb

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0064249A1 (fr) * 1981-05-04 1982-11-10 Abex Corporation Commande de positionnement pour aiguillages
EP2418135A1 (fr) 2010-07-22 2012-02-15 ALSTOM Transport SA Méthode et unité de commande hydraulique pour un dispositif d'actionnement hydraulique pour les entraînements des aiguillages ferroviaires

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0064249A1 (fr) * 1981-05-04 1982-11-10 Abex Corporation Commande de positionnement pour aiguillages
EP2418135A1 (fr) 2010-07-22 2012-02-15 ALSTOM Transport SA Méthode et unité de commande hydraulique pour un dispositif d'actionnement hydraulique pour les entraînements des aiguillages ferroviaires

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019133552A1 (de) * 2019-12-09 2021-06-10 Deutsche Bahn Ag Überwachungsverfahren für einen elektrohydraulischen weichenantrieb
EP3835167A1 (fr) * 2019-12-09 2021-06-16 Deutsche Bahn AG Procédé de surveillance pour un moteur d'aiguille électrohydraulique

Also Published As

Publication number Publication date
RU2019113324A (ru) 2020-10-30
EP3564089B1 (fr) 2022-08-31

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