DE4341810B4 - Sensor device for position detection of a piston - Google Patents
Sensor device for position detection of a piston Download PDFInfo
- Publication number
- DE4341810B4 DE4341810B4 DE4341810A DE4341810A DE4341810B4 DE 4341810 B4 DE4341810 B4 DE 4341810B4 DE 4341810 A DE4341810 A DE 4341810A DE 4341810 A DE4341810 A DE 4341810A DE 4341810 B4 DE4341810 B4 DE 4341810B4
- Authority
- DE
- Germany
- Prior art keywords
- sensor
- piston
- permanent magnet
- sensor device
- magnetic field
- 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.)
- Expired - Fee Related
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 230000006698 induction Effects 0.000 claims description 3
- 238000013459 approach Methods 0.000 abstract 1
- 238000011156 evaluation Methods 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 230000006399 behavior Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002996 emotional effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
- G01D5/2006—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils
- G01D5/2033—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils controlling the saturation of a magnetic circuit by means of a movable element, e.g. a magnet
-
- 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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2807—Position switches, i.e. means for sensing of discrete positions only, e.g. limit switches
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
- G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
Abstract
Sensoreinrichtung für einen einen bewegbaren Kolben enthaltenden Zylinder zur Positionserkennung des Kolbens, mit einen am Kolben oder einen mit dem Kolben verbundenen Element angeordneten Permanentmagneten, wobei wenigstens ein am Zylinder angeordneter magnetfeldempfindlicher, eine Vorzugsrichtung aufweisender Sensor bei Annäherung des Permanentmagneten anspricht, wobei der Permanentmagnet (13, 13a) und der wenigstens eine Sensor (15, 15a; 16; 24, 25; 27–30) so ausgerichtet sind, dass das Magnetfeld (14, 14a) des Permanentmagneten (13, 13a) beim gegenseitigen Passieren in der Bewegungsrichtung an örtlich aufeinanderfolgenden Stellen im wesentlichen parallel zur Vorzugsrichtung des Sensors (15, 15a; 16; 24, 25; 27–30) jedoch jeweils entgegengesetzt gerichtet auf diesen einwirkt und dadurch zwei entgegengesetzt gerichtete Sensorreaktionen auslöst, wobei Mittel zur Speicherung dieser Sensorreaktionen vorgesehen sind und der jeweilige Speicherinhalt die Kolbenposition links oder rechts von der Sensorposition angibt, und wobei eine Fehlersignalstufe (22) vorgesehen ist, die nach dem Einschalten der Versorgungsspannung bis zum erstmaligen Ansprechen des Sensors (16) ein Fehlersignal erzeugt.Sensor device for a cylinder containing a movable piston for position detection of the piston, with a permanent magnet arranged on the piston or an element connected to the piston, at least one sensor, which is sensitive to a magnetic field and has a preferred direction, responds when the permanent magnet approaches, the permanent magnet (13 , 13a) and the at least one sensor (15, 15a; 16; 24, 25; 27-30) are aligned in such a way that the magnetic field (14, 14a) of the permanent magnet (13, 13a) passes locally in the direction of movement consecutive points essentially parallel to the preferred direction of the sensor (15, 15a; 16; 24, 25; 27-30) but each acting in opposite directions and thereby triggering two opposite sensor reactions, means for storing these sensor reactions and the respective one being provided The piston position left or indicates to the right of the sensor position, and an error signal stage (22) is provided which generates an error signal after the supply voltage is switched on until the sensor (16) responds for the first time.
Description
Die Erfindung betrifft eine Sensoreinrichtung für einen einen bewegbaren Kolben enthaltenden Zylinder zur Positionserkennung des Kolbens, mit einem am Kolben oder einem mit dem Kolben verbundenen Element angeordneten Permanentmagneten, wobei wenigstens ein am Zylinder angeordneter magnetfeldempfindlicher, eine Vorzugsrichtung aufweisender Sensor bei Annäherung des Permanentmagneten anspricht.The invention relates to a sensor device for a a movable piston containing position detection cylinder of the piston, with one on the piston or one connected to the piston Element arranged permanent magnet, at least one on Cylinder arranged magnetic field sensitive, a preferred direction having sensor when approaching of the permanent magnet responds.
Eine derartige Sensoreinrichtung
zur Positionserkennung eines Kolbens ist beispielsweise aus der
Aus dem JP-Abstract zur
Die Aufgabe der vorliegenden Erfindung besteht darin, eine Sensoreinrichtung der eingangs genannten Gattung zu schaffen, die nicht nur das Erreichen der Sensorposition durch den Kolben detektieren kann, sondern durch die darüber hinaus immer fehlerfrei festgestellt werden kann, ob sich der Kolben auf der einen oder anderen Seite der Sensoreinrichtung befindet.The object of the present invention consists of a sensor device of the type mentioned to create that not only by reaching the sensor position can detect the piston, but by the beyond It can always be determined without error whether the piston is open one or the other side of the sensor device.
Diese Aufgabe wird erfindungsgemäß durch eine Sensoreinrichtung mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by a Sensor device with the features of claim 1 solved.
Bei jedem Passieren der Sensoreinrichtung durch den Kolben bzw. den Permanentmagneten werden zwei unterschiedliche Sen sorreaktionen, beispielsweise Sensorsignale, ausgelöst, wobei jeweils die letzte gespeichert wird, so dass die Mittel zur Speicherung einen unterschiedlichen Speicherinhalt aufweisen, je nachdem, ob sich der Kolben links oder rechts von der Sensorposition befindet. Beim Einschalten der Versorgungsspannung ist zunächst kein definierter Speicherinhalt vorhanden, das heißt, der Speicherinhalt gibt keine sichere Auskunft über die Position des Kolbens links oder rechts des Sensors. Erfindungsgemäß sorgt jedoch eine Fehlersignalstufe dafür, dass der Speicherinhalt erst nach dem erstmaligen Ansprechen des Sensors als fehlerfrei interpretiert wird. Dadurch können Fehlinterpretationen bis zu diesem erstmaligen Ansprechen verhindert werden.Each time it passes through the sensor device the piston or the permanent magnet become two different ones Sensor reactions, for example sensor signals, are triggered, wherein the last one is saved so that the means of storage have a different memory content, depending on whether the piston is to the left or right of the sensor position. When the supply voltage is switched on, there is initially no defined memory content present, that is, the memory content does not provide reliable information about the position of the piston left or right of the sensor. According to the invention, however, an error signal stage provides for this, that the memory content only after the first response of the Sensor is interpreted as error-free. This can lead to misinterpretations be prevented from responding for the first time.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Anspruch 1 angegebenen Sensoreinrichtung möglich.By the measures listed in the subclaims are advantageous developments and improvements in the claim 1 specified sensor device possible.
Um zu erreichen, dass das Magnetfeld des Permanentmagneten beim Passieren der Sensoreinrichtung zweimal entgegengesetzt gerichtet auf diese einwirkt, um die beiden unterschiedlichen Sensorreaktionen auszulösen, wird entweder die Nord-Süd-Achse des Permanentmagneten radial und die Vorzugsrichtung des Senßors parallel zur Bewegungsrichtung des Kolbens ausgerichtet, oder die Nord-Süd-Achse des Permanentmagneten wird parallel zur Bewegungsrichtung des Kolbens und die Vorzugsrichtung des Sensors radial ausgerichtet. Eine vorteilhafte Lösung zur elektrischen Speicherung der Sensorreaktionen besteht darin, dass der Sensor ein magnetfeldempfindliches elektrisches Element besitzt, das als Sensorreaktionen unterschiedliche elektrische Signale erzeugt, wobei diesem magnetfeldempfindlichen Element ein elektrischer Signalspeicher nachgeschaltet ist. Dieser elektrische Signalspeicher ist zweckmäßigerweise als Komparator oder als bistabile Kippschaltung ausgebildet, beispielsweise als Schmitt-Trigger. Insbesondere bei einem hysteresebehafteten Komparator, wie einem Schmitt-Trigger, ist ein besonderes sicheres Schaltverhalten gegeben, da hier beim Überschreiten einer höheren positiven Schwelle eingeschaltet und beim Unterschreiten einer niedrigeren negativen Schwelle ausgeschaltet wird. Die beiden Signalzustände als Sensorreaktionen bleiben dabei gespeichert. Die erfindungsgemäße Sensoreinrichtung lässt sich daher in einfacher und kostengünstiger Weise aus zwei handelsüblichen Bauteilen herstellen.To achieve that magnetic field of the permanent magnet twice when passing through the sensor device opposed to this acts to make the two different Trigger sensor reactions, becomes either the north-south axis of the permanent magnet radially and the preferred direction of the sensor parallel aligned with the direction of movement of the piston, or the north-south axis of the permanent magnet is parallel to the direction of movement of the piston and the preferred direction of the sensor is aligned radially. An advantageous one solution for electrical storage of the sensor reactions consists in that the sensor is a magnetic field sensitive electrical element has different electrical signals as sensor reactions generated, this magnetic field sensitive element is an electrical State memory is connected. This electrical latch is convenient designed as a comparator or as a bistable multivibrator, for example as a Schmitt trigger. Especially in the case of hysteresis Comparator, like a Schmitt trigger, is a particularly safe switching behavior given because here when crossing a higher one positive threshold switched on and when falling below a lower one negative threshold is switched off. The two signal states as Sensor reactions remain saved. The sensor device according to the invention can be therefore in a simple and inexpensive manner from two commercially available Manufacture components.
Um zu verhindern, dass beim Wiedereinschalten der Anordnung ein zufälliges Speichersignal vorliegt, wird der Signalspeicher ständig mit einer Betriebsspannung beaufschlagt.To prevent turning on again the arrangement a random Memory signal is present, the signal memory is constantly with an operating voltage.
Eine weitere vorteilhafte Möglichkeit einer magnetischen Speicherung der Sensorreaktion besteht darin, dass der Sensor als Signalspeicher ein magnetisierbares und ummagnetisierbares Element besitzt, das mit einem magnetfeldempfindlichen elektrischen Element in Wirkverbindung steht, welches als Sensorreaktionen unterschiedliche elektrische Signale erzeugt.A further advantageous possibility of magnetic storage of the sensor reaction consists in the sensor having a magnetizable and magnetically reversible element as the signal memory, which element is operatively connected to a magnetic field-sensitive electrical element which, as sensor reactions, has different electrical Si gnale generated.
Die Mittel zur Wiedergabe der unterschiedlichen elektrischen Signale können optische, akustische oder elektrische Mittel sein.The means of rendering the different electrical signals can be optical, acoustic or electrical means.
Das magnetfeldempfindliche elektrische Element kann als Hall-Element, als Feldplatte oder als Induktionsspule ausgebildet sein.The magnetic field sensitive electrical Element can be used as a Hall element, be designed as a field plate or as an induction coil.
Schließlich besteht auch noch eine vorteilhafte Möglichkeit, die Sensorreaktionen mechanisch zu speichern. Hierbei weist der Sensor als Signalspeicher ein bewegbares oder magnetißierbares, vom Permanentmagneten in seiner Position veränderbares Element auf. Vorzugsweise ist das Element um eine Achse schwenkbar angeordnet, wobei Mittel zum Festlegen der beiden Schwenkendpositionen vorgesehen sind und der passierende Permanentmagnet diese Mittel überwindet. An der jeweiligen Schwenkendposition oder allgemein an der Position dieses bewegbaren Elements kann dann abgelesen werden, auf welcher Seite der Sensoreinrichtung sich der Kolben befindet.Finally, there is also one advantageous way save the sensor reactions mechanically. Here, the Sensor as a signal memory a movable or magnetizable, from Permanent magnet in its position variable element. Preferably the element is arranged pivotable about an axis, means for Setting the two swivel end positions are provided and the passing permanent magnet overcomes these means. At the respective swivel end position or generally at the position of this moveable element can be read on which side of the sensor device the Piston is located.
Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:Embodiments of the invention are shown in the drawing and in the description below explained in more detail. It demonstrate:
Gemäß
Wie aus
Im unteren Bereich von
Beim Passieren des Kolbens
In
In
Der Sensor
Beim Passieren des Permanentmagneten
Anstelle der als einfaches Beispiel
angegebenen Anzeigevorrichtung durch zwei Anzeigeleuchten
Beim Einschalten der Betriebsspannung
befindet sich der Schmitt-Trigger
Anstelle des Hall-Elements
Bei dem in
Bei dem in
Nimmt die Anordnung gemäß
Anstelle des schwenkbaren Stabmagneten
Anstelle des Permanentmagneten
Claims (13)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4341810A DE4341810B4 (en) | 1993-12-08 | 1993-12-08 | Sensor device for position detection of a piston |
GB9423992A GB2286049B (en) | 1993-12-08 | 1994-11-28 | A sensor device responsive to the position of a piston |
ITMI942415A IT1271109B (en) | 1993-12-08 | 1994-11-29 | "SENSOR DEVICE FOR RECOGNIZING THE POSITION OF A PISTON" |
FR9414887A FR2713757B1 (en) | 1993-12-08 | 1994-12-06 | Device for detecting the position of a piston. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4341810A DE4341810B4 (en) | 1993-12-08 | 1993-12-08 | Sensor device for position detection of a piston |
Publications (2)
Publication Number | Publication Date |
---|---|
DE4341810A1 DE4341810A1 (en) | 1995-06-14 |
DE4341810B4 true DE4341810B4 (en) | 2004-01-29 |
Family
ID=6504464
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE4341810A Expired - Fee Related DE4341810B4 (en) | 1993-12-08 | 1993-12-08 | Sensor device for position detection of a piston |
Country Status (4)
Country | Link |
---|---|
DE (1) | DE4341810B4 (en) |
FR (1) | FR2713757B1 (en) |
GB (1) | GB2286049B (en) |
IT (1) | IT1271109B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005030722A1 (en) * | 2005-07-01 | 2007-01-04 | Bosch Rexroth Teknik Ab | Actuating cylinder used in handling and transport systems comprises a measuring unit with a magnetic field sensor arranged relative to the magnetic field at a specified angle to the main measuring direction |
DE102005021742B4 (en) * | 2004-06-03 | 2015-02-05 | Schaeffler Technologies Gmbh & Co. Kg | Method for determining the dead path of a hydraulic system |
CN107076575A (en) * | 2014-08-25 | 2017-08-18 | 法雷奥电机控制系统公司 | Hall effect linear position sensor for motor vehicles |
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DE19600616A1 (en) * | 1996-01-10 | 1997-07-17 | Bosch Gmbh Robert | Device for detecting deflections of a magnetic body |
DE19712829B4 (en) * | 1997-03-26 | 2005-02-17 | Sick Ag | Device for detecting the position of a moving object |
DE19757160A1 (en) * | 1997-12-20 | 1999-06-24 | Omb Oberdorfer Maschinenfabrik | Safety control block for high pressure cleaning device |
DE19836599A1 (en) * | 1998-08-13 | 2000-02-17 | Windhorst Beteiligungsgesellsc | Process for the contactless magnetic detection of linear relative movements between permanent magnets and electronic sensors |
DE19915832A1 (en) * | 1999-04-08 | 2000-07-06 | Bayerische Motoren Werke Ag | Vehicle with position transducer for power control element has Hall switch with magnet integrated into transducer cylinder and pick-up part for mounting on housing of transducer cylinder |
JP2002048108A (en) * | 2000-08-04 | 2002-02-15 | Smc Corp | Mounting structure for position sensor |
DE10053995A1 (en) * | 2000-10-31 | 2002-05-08 | Continental Teves Ag & Co Ohg | Signal generator with Hall sensor integrated in a master cylinder |
DE10108737B4 (en) * | 2001-02-23 | 2005-04-07 | Festo Ag & Co. | Position sensor device for detecting the position of movable elements, in particular the piston position in working cylinders |
US7521923B2 (en) | 2002-04-23 | 2009-04-21 | Abas, Incorporated | Magnetic displacement transducer |
DE10238402A1 (en) | 2002-08-22 | 2004-03-04 | Zf Sachs Ag | Piston-cylinder unit |
FR2851538B1 (en) * | 2003-02-21 | 2006-04-28 | Bosch Gmbh Robert | MASTER CYLINDER OF A MOTOR VEHICLE WITH A DETECTION DEVICE FOR ACTUATING A BRAKING SYSTEM |
DE10309142B4 (en) * | 2003-02-28 | 2006-09-21 | Eisenmann Lacktechnik Gmbh & Co. Kg | Position detector for a pig moving in a pipe |
US7219495B2 (en) | 2004-06-04 | 2007-05-22 | Zf Friedrichshafen Ag | Hydraulic cylinder |
DE502004012087D1 (en) * | 2004-06-04 | 2011-02-17 | Zahnradfabrik Friedrichshafen | hydraulic cylinders |
US20090322315A1 (en) * | 2008-06-30 | 2009-12-31 | Werner Dengler | Linear-movement sensor in an egr valve |
US8405386B2 (en) | 2009-02-17 | 2013-03-26 | Goodrich Corporation | Non-contact sensor system and method for position determination |
US8203331B2 (en) | 2009-02-17 | 2012-06-19 | Goodrich Corporation | Non-contact sensor system and method for selection determination |
US8207729B2 (en) | 2009-02-17 | 2012-06-26 | Goodrich Corporation | Non-contact sensor system and method for displacement determination |
NO20120965A1 (en) * | 2012-08-28 | 2014-03-03 | Sensorlink As | Method and system for determining the position of a piston in a cylinder |
DE112016000879A5 (en) * | 2015-02-24 | 2017-11-02 | Schaeffler Technologies AG & Co. KG | Actuator for actuating a friction clutch |
DE102016216990A1 (en) * | 2016-09-07 | 2018-03-08 | Schaeffler Technologies AG & Co. KG | Actuator for actuating a friction clutch |
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1993
- 1993-12-08 DE DE4341810A patent/DE4341810B4/en not_active Expired - Fee Related
-
1994
- 1994-11-28 GB GB9423992A patent/GB2286049B/en not_active Expired - Fee Related
- 1994-11-29 IT ITMI942415A patent/IT1271109B/en active IP Right Grant
- 1994-12-06 FR FR9414887A patent/FR2713757B1/en not_active Expired - Fee Related
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005021742B4 (en) * | 2004-06-03 | 2015-02-05 | Schaeffler Technologies Gmbh & Co. Kg | Method for determining the dead path of a hydraulic system |
DE102005030722A1 (en) * | 2005-07-01 | 2007-01-04 | Bosch Rexroth Teknik Ab | Actuating cylinder used in handling and transport systems comprises a measuring unit with a magnetic field sensor arranged relative to the magnetic field at a specified angle to the main measuring direction |
CN107076575A (en) * | 2014-08-25 | 2017-08-18 | 法雷奥电机控制系统公司 | Hall effect linear position sensor for motor vehicles |
Also Published As
Publication number | Publication date |
---|---|
GB2286049B (en) | 1997-10-08 |
ITMI942415A1 (en) | 1996-05-29 |
IT1271109B (en) | 1997-05-26 |
DE4341810A1 (en) | 1995-06-14 |
FR2713757A1 (en) | 1995-06-16 |
FR2713757B1 (en) | 1997-01-31 |
ITMI942415A0 (en) | 1994-11-29 |
GB9423992D0 (en) | 1995-01-11 |
GB2286049A (en) | 1995-08-02 |
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