EP1489309A1 - Einrichtung zur Ermittlung der Position eines hydraulischen Ventils - Google Patents

Einrichtung zur Ermittlung der Position eines hydraulischen Ventils Download PDF

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Publication number
EP1489309A1
EP1489309A1 EP04013956A EP04013956A EP1489309A1 EP 1489309 A1 EP1489309 A1 EP 1489309A1 EP 04013956 A EP04013956 A EP 04013956A EP 04013956 A EP04013956 A EP 04013956A EP 1489309 A1 EP1489309 A1 EP 1489309A1
Authority
EP
European Patent Office
Prior art keywords
valve spool
sensor
valve
axial direction
article
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Withdrawn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
EP04013956A
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English (en)
French (fr)
Inventor
Ric Unit 9/6 Tamba
Mariusz Unit 9/6 Dudzik
Paul Unit 9/6 Donnelly
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.)
Nautitech Manufacturing Services Pty Ltd
Original Assignee
Nautitech Pty Ltd
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 Nautitech Pty Ltd filed Critical Nautitech Pty Ltd
Publication of EP1489309A1 publication Critical patent/EP1489309A1/de
Withdrawn legal-status Critical Current

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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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B2013/0409—Position sensing or feedback of the valve member

Definitions

  • the present invention relates generally to the field of hydraulic controls and in particular, the invention provides an improved hydraulic valve position-monitoring sensor which improves the reliability of valve monitoring.
  • Hydraulic valves are used in machinery to control motive force by controlling the flow of hydraulic fluid into rams and hydraulic motors used for both motion of the machine itself, and/or motion of implements or other moving components of the machine such as press components, digging implements, etc.
  • hydraulic machinery is provided with safety systems to prevent undesired movement of the machine or machine components at various points in the operation of the machine.
  • a safety screen on a hydraulic press to prevent access while the press is operating and to have interlocks on the screen, which prevent operation whenever the safety screen is not in its closed position.
  • pressure sensors on the downstream side of a hydraulic valve to detect pressure in the hydraulic circuit of a machine and to prevent certain activities from occurring if the hydraulic circuit is pressurised.
  • the pressure sensor will read 0 (zero) pressure because the hydraulic pump is not operating and therefore there is no pressure on either side of the hydraulic valve.
  • the pressure sensor will not read a pressure sufficient to indicate a dangerous situation, until such time as the hydraulic fluid has passed through the valve to create pressure in the downstream side of the circuit.
  • the pressure is building up to the level where the pressure sensor will trip, and due to delays and inertia after the sensor has detected a pressure, there will also be motion of the equipment driven by that hydraulic circuit and this can, in some circumstances, be quite dangerous and result in the accidental injury of a worker who might not have expected the equipment to move when the hydraulic pump was started. Every year there are a significant number of deaths in industry caused by unintentional movement of a machine at start-up and the device of the present invention in intended to reduce the possibility of occurrence of such accidents.
  • the present invention provides a valve spool monitor comprising position sensing means arranged to be mounted adjacent to a valve spool of a hydraulic valve and arranged to measure the absolute position of the spool within the valve and to provide an output signal indicative of the absolute position.
  • the present invention provides a method of monitoring a valve spool, the method comprising locating a position sensing means adjacent to a valve spool of a hydraulic valve, to measure the absolute position of the spool within the valve and to provide an output signal indicative of the absolute position.
  • the position sensing means comprises a first, sensed, component mounted in the valve spool or on a member operatively coupled with and moving I n unison with the valve spool, and a second, sensor, element located adjacent a path described by the sensed component when the valve spool travels through its stroke, such that the sensed component passes under the sensor element as it travels along its path.
  • the present invention provides a position sensor for sensing the position of an article that moves over a short predetermined path, the position sensor comprising a housing, mounting means arranged to permit mounting of the housing in a fixed location adjacent the article, the housing having an internal cavity having a substantially constant cross section along an axial direction of the cavity and in which is located a travelling element configured to cooperate with the walls of the cavity to be guided to describe a predetermined path in the axial direction, coupling means arranged to operatively couple the travelling element with the article, a sensed element being mounted on the travelling element and a sensor being mounted in or on the housing adjacent the path of the travelling element, such that the sensed element moves laterally under the sensor and whereby the sensor senses the position of the sensed element and generates a signal indicative of its position.
  • the present invention provides a method of sensing the position of an article that moves over a short predetermined path comprising mounting a housing enclosing a monitor assembly in a fixed location adjacent the article, providing the housing with an internal cavity and internal guiding surfaces extending in an axial direction of the cavity, locating a travelling member between the guiding surfaces to be guided to describe a predetermined path in the axial direction, operatively coupling the travelling member with the article, locating a sensed element relative to the travelling member and locating a sensor adjacent the path of the travelling member, such that the sensed element moves laterally under the sensor and whereby the sensor senses the position of the sensed element and generates a signal indicative of its position, to indicate the position of the article.
  • the sensed component is a magnet mounted on a member extending in the axis of the valve spool and coupled to the valve spool to move therewith
  • the sensor is preferably a magnetic field angle sensor located adjacent to a path described by the magnet, whereby the magnetic field angle sensor determines valve position by monitoring the change in angle of the magnetic field of the magnet at the sensor as the magnet moves past the sensor.
  • valve spool monitor or position sensor further includes processing means to convert the sensor output signal to an assembly output signal whereby the sensor output signal is indicative of the instantaneous position of the valve and the assembly output signal, includes discrete levels which indicate closed and opened position signals.
  • FIGs 1 and 2 show a partial cutaway side view and an end view respectively, of a hydraulic valve with a valve sensor assembly attached.
  • a valve body 11, housing a valve spool 12, having valve porting 13 is provided with a sensor assembly 22, attached to the rear of the valve housing.
  • the sensor assembly 22 comprises a sensor housing 14 in which is housed a valve spool extension member 15 operatively coupled with the valve spool 12 to act as a valve spool follower and, in this case, physically connected to the valve spool 12 by a linkage 16.
  • the valve spool extension member 15 travels in a cavity 24 in the sensor housing 14, and has mounted on one side, a magnet element 17 which is located adjacent to one side of the cavity 24.
  • the magnetic element 17 travels backwards and forwards along a surface of a wall 25 of the sensor housing 14 when the valve spool 12 moves in the hydraulic valve body 11 such that the magnetic element 17 moves under a sensor element 19, housed in a second chamber 26 of the sensor assembly 22.
  • the sensor element 19 is mounted to a sensor electronics board 18, also mounted within the chamber 26 and a signal cable 21 extends from the electronics board 18 through an aperture in an end cap 27 of the chamber 26 and then runs to a control system of the machine to which the hydraulic valve is connected.
  • the senor relies on field direction, it is independent of magnet strength and temperature and therefore its accuracy is relatively independent of operating conditions.
  • a seal 23 is provided between the valve body 11 and the sensor housing 14 and extends around the spool 12 to prevent loss of hydraulic fluid from the valve into the chamber 24 of the sensor body 14.
  • FIG. 3 a second embodiment of a valve sensor is illustrated in which a partial cutaway side view of a hydraulic valve with a sensor attached is again shown.
  • the valve body 11 in Fig. 3 is similar to that shown in Figs. 1 & 2 and houses a valve spool 12, having valve porting 13.
  • the Fig. 3 valve body 11 is provided with a sensor assembly 122, attached to the rear of the valve housing.
  • the sensor assembly 122 which comprises a sensor housing 114 in which is housed a valve spool extension member 115 operatively coupled with the valve spool 112 to act as a valve spool follower and is biased into engagement with the valve spool 12 by a spring 116.
  • a guide 129 is screwed through the housing 114 and extends down the centre of the spring 116 to maintain the spring in alignment and to act as a stop for the valve spool extension member 115 to prevent over-compression of the spring 116 and to calibrate the position of the valve spool, 12.
  • the valve spool extension member 115 travels in a cavity 124 in the sensor housing 114, and is retained by a screw 140 extending through the side of the housing 114 and into a slot 141 in the side of the valve spool extension member, which prevents rotation of the valve spool extension member.
  • the valve spool extension member 115 has mounted on one side, a magnet element 117 which is located adjacent to one side of the cavity 124.
  • the magnetic element 117 travels backwards and forwards along a surface of a wall 125 of the sensor housing 114 when the valve spool 12 moves in the hydraulic valve body 11 such that the magnetic element 117 moves under a sensor element 119, housed in a second chamber 126 of the sensor assembly 122.
  • the sensor element 119 is mounted to a sensor electronics board 118, also mounted within the chamber 126 and a signal cable 121 extends from the electronics board 118 through a conduit 128 extending through an end plate 127 of the chamber 126 and then runs to a control system of the machine to which the hydraulic valve is connected.
  • a seal 123 is provided between the valve body 11 and the sensor housing 114 as in the first embodiment and extends around the spool 12 to prevent loss of hydraulic fluid from the valve to atmosphere.
  • FIG. 4 the electronic and magnetic function of the sensor assembly 22, 122 are schematically illustrated.
  • the description of the circuit of Fig. 4 will refer to the elements described in relation to the embodiment of Figs. 1 & 2 however this circuit will operate identically with the embodiment of Fig. 3.
  • the magnet 15 produces lines of magnetic field radiating out of the upper (eg; north) pole of the magnet and these lines pass through the sensor chip 19 mounted on the electronics board 18 of the sensor assembly.
  • the chip is a HoneywellTM Linear/Angular/Rotary Displacement Sensor, model HMC1501 or HMC1512.
  • AMR anisotropic magnetoresistance
  • AMR is a change in resistance which occurs when a magnetic field is applied in a thin strip of ferrous material such as a permalloy thin film (NiFe).
  • the magnetoresistance is a function of Cos 2 ⁇ where ⁇ is the angle between magnetization M and current flow in the thin strip.
  • the magnetic field applied to the HoneywellTM HMC1501 or HMC1512 devices is greater than 80 Oe, the magnetization aligns in the direction of the applied field; this is called saturation mode. In this mode, ⁇ is the angle between the applied field and the current flow.
  • the sensor chip 19 measures a field angle ⁇ being the angle 34 between the axis of the chip and a field direction of field lines 35 passing through the chip.
  • the circuit board 18 carries a circuit which interfaces the sensor chip output 37 of a signal representing the field angle ⁇ to a microprocessor which converts the field angle signal into a digital position signal representing the linear position of the magnetic element 17 and hence the valve spool 12.
  • the microprocessor 36 then further processes the position signal to provide a value status output.
  • the microprocessor is a MicrochipTM PIC12CE674TM. This 8 pin DIL packaged integrated circuit has analogue inputs, digital input/output and EEPROM data storage in which the calibration data is held.
  • the microprocessor 36 outputs valve status information which is converted to a 4-20 mA signal 21 carried on a current loop circuit 31 to the control system 32 of the machine to which the valve is fitted.
  • the 4-20 mA signal is typically passed through a 250 ⁇ resistor to convert it to a 1-5 volt signal.
  • the 4-20 mA signal uses the following protocol to indicate value status:
  • the sensor unit After installation of a sensor unit, the sensor unit is calibrated. The valve is moved towards hydraulic crack point and then moved back till there is no flow. The equivalent absolute location is then read from the sensor and programmed into EEPROM of the microprocessor. Calibration is performed separately for the right and left crack point positions of the valve.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Indication Of The Valve Opening Or Closing Status (AREA)
EP04013956A 2003-06-17 2004-06-15 Einrichtung zur Ermittlung der Position eines hydraulischen Ventils Withdrawn EP1489309A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2003903036 2003-06-17
AU2003903036A AU2003903036A0 (en) 2003-06-17 2003-06-17 Spool position detection for a hydraulic valve

Publications (1)

Publication Number Publication Date
EP1489309A1 true EP1489309A1 (de) 2004-12-22

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Family Applications (1)

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EP04013956A Withdrawn EP1489309A1 (de) 2003-06-17 2004-06-15 Einrichtung zur Ermittlung der Position eines hydraulischen Ventils

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EP (1) EP1489309A1 (de)
AU (1) AU2003903036A0 (de)
ZA (1) ZA200404785B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005060414A1 (de) * 2005-12-15 2007-06-21 Bosch Rexroth Ag Elektrohydraulische Steuervorrichtung, Ventil und Ansteuerelektronik
WO2007076750A1 (de) * 2005-12-17 2007-07-12 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Verfahren zur montage einer ventileinrichtung und ventileinrichtung
WO2008031565A1 (de) * 2006-09-11 2008-03-20 Trw Automotive Gmbh Baugruppe zur erfassung einer ventilstellung
EP1914459A1 (de) * 2006-10-21 2008-04-23 Robert Bosch GmbH Ventilanordnung mit Positionssensor
WO2010145906A1 (de) * 2009-06-18 2010-12-23 Pierburg Gmbh Elektromagnetventil
WO2014033728A3 (en) * 2012-06-29 2014-05-22 Eaton Corporation Valve spool monitoring using anisotropic magnetoresistance sensor
EP4293260A1 (de) * 2022-06-17 2023-12-20 Eugen Seitz AG Ventil

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6152172A (en) * 1999-07-28 2000-11-28 Husco International, Inc. Hall effect valve spool position sensor
EP1069321A2 (de) * 1999-07-12 2001-01-17 Smc Corporation Wegeventil mit Positionsermittlung
EP1069322A2 (de) * 1999-07-14 2001-01-17 Smc Corporation Wegeventil mit Positionsermittlung
EP1184611A2 (de) * 2000-09-05 2002-03-06 Smc Corporation Ventilmodul mit Positionssensor
EP1195528A2 (de) * 2000-10-06 2002-04-10 Smc Corporation Wegeventil mit Magnetsensor
US20020125884A1 (en) * 2001-02-23 2002-09-12 Matthias Wendt Device with a magnetic position sensor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1069321A2 (de) * 1999-07-12 2001-01-17 Smc Corporation Wegeventil mit Positionsermittlung
EP1069322A2 (de) * 1999-07-14 2001-01-17 Smc Corporation Wegeventil mit Positionsermittlung
US6152172A (en) * 1999-07-28 2000-11-28 Husco International, Inc. Hall effect valve spool position sensor
EP1184611A2 (de) * 2000-09-05 2002-03-06 Smc Corporation Ventilmodul mit Positionssensor
EP1195528A2 (de) * 2000-10-06 2002-04-10 Smc Corporation Wegeventil mit Magnetsensor
US20020125884A1 (en) * 2001-02-23 2002-09-12 Matthias Wendt Device with a magnetic position sensor

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005060414A1 (de) * 2005-12-15 2007-06-21 Bosch Rexroth Ag Elektrohydraulische Steuervorrichtung, Ventil und Ansteuerelektronik
WO2007076750A1 (de) * 2005-12-17 2007-07-12 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Verfahren zur montage einer ventileinrichtung und ventileinrichtung
WO2008031565A1 (de) * 2006-09-11 2008-03-20 Trw Automotive Gmbh Baugruppe zur erfassung einer ventilstellung
EP1914459A1 (de) * 2006-10-21 2008-04-23 Robert Bosch GmbH Ventilanordnung mit Positionssensor
WO2010145906A1 (de) * 2009-06-18 2010-12-23 Pierburg Gmbh Elektromagnetventil
WO2014033728A3 (en) * 2012-06-29 2014-05-22 Eaton Corporation Valve spool monitoring using anisotropic magnetoresistance sensor
EP4293260A1 (de) * 2022-06-17 2023-12-20 Eugen Seitz AG Ventil
WO2023242350A1 (de) * 2022-06-17 2023-12-21 Eugen Seitz Ag Ventileinheit

Also Published As

Publication number Publication date
ZA200404785B (en) 2005-02-11
AU2003903036A0 (en) 2003-07-03

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