EP1446560B1 - Sensoranordnung zur erfassung der bewegung eines ankers mit unterdrückung von störspannungen - Google Patents
Sensoranordnung zur erfassung der bewegung eines ankers mit unterdrückung von störspannungen Download PDFInfo
- Publication number
- EP1446560B1 EP1446560B1 EP02803393A EP02803393A EP1446560B1 EP 1446560 B1 EP1446560 B1 EP 1446560B1 EP 02803393 A EP02803393 A EP 02803393A EP 02803393 A EP02803393 A EP 02803393A EP 1446560 B1 EP1446560 B1 EP 1446560B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rod
- arrangement
- shaped sensor
- sensor piece
- sensor part
- 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 - Lifetime
Links
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- 238000002485 combustion reaction Methods 0.000 claims abstract description 6
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- 230000008901 benefit Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
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- 230000035699 permeability Effects 0.000 description 1
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Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
- F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing
Definitions
- Electromagnets for control purposes influence the movement of the anchor and thus on the movement of the actuated Actuator can be taken (see DE-A-19 918 993).
- an electro-inductive sensor used, consisting essentially of a fixed Coil arrangement and a rod-shaped, this relatively movable, connected to the actuator sensor part, the is provided with a so-called eddy current ring. From at least two axially successively arranged coils existing Coil arrangement is made with a high frequency alternating current acted upon, so that relative movements of the short-circuit ring on the rod-shaped sensor part opposite the coils due to the magnetic opposing field generated in the short-circuit ring change the electrical quality of the coils. From this movement-dependent change of the coil quality is the movement as a signal derivable (see EP-A-0 170 723).
- the anchor In an electromagnetic actuator for actuating a Gas exchange valve on a reciprocating internal combustion engine, in the the anchor between the facing, with distance to each other arranged pole faces of a normally closed and a Closing magnet against the force of return springs and is moved, the anchor comes in its respective bottleneck at the pole face to the plant.
- the arrangement is here made so that the anchor on the side of its closing magnet a cooperating with the opening spring separate Federbolzen is assigned, which is loose, but non-positively supported on the anchor.
- the invention is based on the object, a sensor arrangement to create a significant reduction of the Interference voltage leads.
- the Reduction of interference voltage Means of damping in the rod-shaped sensor part propagating structure-borne sound waves are provided. Already by a damping of structure-borne sound waves a significant reduction of interference voltages is achieved.
- the free end of the rod-shaped sensor part at least an inclined to the longitudinal axis of the rod-shaped sensor part extending Endface has.
- inclined running Enfiguration becomes the reflection of itself in the rod-shaped Sensor part resulting from impact stresses Structure-borne sound waves significantly reduced.
- the length of the inclined End surface is suitably about six times the diameter of the sensor part.
- the resulting suppressed acute angle with respect to the longitudinal axis of the sensor part a reflection of structure-borne sound waves towards the other end of the sensor part.
- a conical leaking end piece on the sensor part is advantageously.
- an axial recess is provided on the rod-shaped sensor part.
- This recess can be cylindrical, d. H. as a simple longitudinal bore be executed, so that the rod-shaped sensor part at least is tubular in the coil-near area. Especially it is expedient if the axial recess tapered is trained. Again, the length of the recess in particular, the length of the conical recess appropriate be about six times the diameter of the rod part.
- the advantage of this embodiment is a clear Length reduction.
- the recess with a magnetically permeable material is filled, the another, preferably lower E-module has as the material of the rod-shaped sensor part.
- the rod-shaped Sensor part due to the desired magnetic properties made of a soft magnetic material, in particular a Consist iron material.
- a soft magnetic material in particular a Consist iron material.
- Such a material has a with respect to the signal to noise ratio large magnetorestrictive Effect on.
- By hardening the material used is on.
- By hardening the material used becomes the magnetorestrictive Effect greatly reduced, so no significant Disturbances can occur more.
- the remaining magnetic Properties are only slightly affected, in particular in that by hardening the eddy current losses smaller and the re-magnetization losses are greater. Thereby the overall effect is pretty neutral.
- An impact on the relative magnetic permeability is not or is within the tolerance of the starting material. The sensitivity a hardened rod-shaped sensor part is thus not negatively affected, but the damping effect significantly improved.
- the illustrated in Fig. 1 electromagnetic actuator is essentially formed by two electromagnets 1 and 2, which are enclosed by two housing parts 3.1 and 3.2, the in turn via a trained as a spacer housing part 3.3 spaced apart and with their pole faces 4 are aligned with each other. In the of the spacer 3.3 enclosed movement space between the two pole faces. 4 An armature 5 is arranged, which via a guide pin 6.1 guided in a guide 7 back and forth.
- the armature 5 is connected via a spring pin 6.2, which rises the guide pin 6.1 is supported in the region of the armature 5 on this with a return spring 8 in connection.
- the other lower free end 9 of the guide pin 6.1 is supported here on an actuator, for example the free end of the Shank 11 of a gas exchange valve in the here only indicated cylinder head 12 of a reciprocating internal combustion engine is guided.
- a return spring 13 the gas exchange valve in the closing direction (arrow 11.1) acted upon, wherein the return spring 13 and the return spring 8 in their Force direction are directed against each other, so that when de-energized electromagnets set the anchor 5 according to his Rest position between the two pole faces 4 of the two Electromagnet 1 and 2 occupies, as shown in Fig. 1 is.
- the housing parts enclose 3.1 and 3.2 of the two electromagnets in each case a preferably cuboid yoke body 14, which are provided with recesses into which a ring-shaped trained coil 15 is inserted, each over a control device not shown here for opening and closing the gas exchange valve alternately energized are.
- a sensor arrangement 16 is provided which essentially is formed from a rod-shaped sensor part 17, which with This is firmly connected and practically an extension of the Spring bolt 6.2 represents.
- the rod-shaped sensor part 17 is surrounded by a coil assembly 18 which is connected to a power supply and signal detection 19 is connected. Operational becomes by the float of the rod-shaped Sensor part 17, the electrical quality of the coil assembly 18th changed. This change is proportional to the way the Sensor part and thus proportional to the path of the armature 5 or of the actuator 11. The operation will be described below explained in more detail.
- Fig. 2 is an embodiment for a sensor arrangement represented in which the rod-shaped sensor part 17 of a two-part coil assembly 18 is included, which via corresponding Leads 20, 21 and 22 with the power supply and evaluation device 19 is connected.
- the illustrated rod-shaped sensor 17 is provided with a ring 23 made of an electrically conductive material with low ohmic Resistance, provided a so-called short-circuit ring.
- a Such sensor arrangement operates on the eddy current principle. If the coil assembly 18 with a high-frequency AC applied, so that through the coil assembly a high frequency magnetic field is generated, then in the Short circuit ring due to the resulting eddy currents a magnetic Generated opposing field. Will now be the rod-shaped sensor part 17 with its shorting ring 23 relative to the coils 18.1 and 18.2 moved, then the magnetic opposing field works the causing high-frequency magnetic field of the coil arrangement 18 in the form of field displacement and field weakening.
- the characteristic of the two coils 18.1 and 18.2 is in each case by their inductance and their electrical quality given the electrical quality by the ratio of Reactive power to active power is specified.
- Fig. 1 is the Meßstelze in Fig. 2 shown in the open position of the gas exchange valve.
- the rod-shaped sensor part 17 is provided with a conically tapering end face 24 in the embodiment shown in FIG.
- the cone angle is as slim as possible in order to prevent a reflection of structure-borne sound waves in the longitudinal direction in that they are reflected substantially against the peripheral wall. It is expedient in this case if the length of the conical end surface 24 corresponds approximately to six times the diameter of the rod-shaped sensor part 17.
- the end surface need not necessarily correspond to a cone in the geometric sense, but may also be formed as an ellipsoid or the like.
- a recess 25 is provided instead of a tip.
- the recess may be cylindrical, but it is expedient to have a conical recess which extends at least into the area of the short-circuit ring 23.
- Fig. 5 shows another modification.
- this modification is the spring bolt 6.2 over a large part of its length provided with an axial bore or tubular, wherein the interior is filled with a material 26 is that has a different, preferably lower modulus of elasticity as the material of the spring bolt 6.2.
- the short-circuit ring 23 can by a copper ring with discrete Wall thickness can be formed or even by a thin electroplated copper layer or a layer from another electrically well conductive material.
- Fig. 6 is a circuit for the measured value detection schematically represented in the form of a Murphyfrequenzmeßmaschine.
- the two coils 18.1 and 18.2 of the coil assembly 18 are with two other components, preferably resistors or Coils 18.3 and 18.4 interconnected to a Susunsky Republic 27.
- the bridge 27 will have at least one Frequency generator 28 with a high-frequency alternating current fed. The feed is expedient over two antiphase working frequency generators 28.1 and 28.2.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
- Magnetically Actuated Valves (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Description
- Fig. 1
- einen elektromagnetischen Aktuator zur Betätigung eines Gaswechselventils,
- Fig. 2
- einen stabförmigen Sensorteil mit Spulenanordnung,
- Fig. 3
- eine Ausführungsform des stabförmigen Sensorteils mit konischer Spitze,
- Fig. 4
- einen stabförmigen Sensorteil mit konischer Ausnehmung,
- Fig. 5
- einen stabförmigen Sensorteil mit einer gefüllten Ausnehmung,
- Fig. 6
- eine Schaltungsanordnung.
In Fig. 4 ist eine Ausführungsform dargestellt, bei der statt einer Spitze eine Ausnehmung 25 vorgesehen ist. Die Ausnehmung kann zylindrisch ausgebildet sein, zweckmäßig ist jedoch eine konische Ausnehmung, die sich mindestens bis in den Bereich des Kurzschlußringes 23 erstreckt.
Claims (8)
- Sensoranordnung zur Erfassung der Bewegung eines Ankers (5) an einem elektromagnetischen Aktuator zur Betätigung eines Stellgliedes, insbesondere zur Betätigung eines Gaswechselventils an einer Kolbenbrennkraftmaschine, mit einem aus einem weichmagnetischen Material bestehenden, axial bewegten stabförmigen Sensorteil (17), das mit einem Ring (23) aus elektrisch leitendem Material mit geringem ohmschen Widerstand versehen ist und das mit dem Stellelement in Verbindung steht, sowie mit einer feststehenden, den stabförmigen Sensorteil (17) zumindest über eine Teillänge umfassenden Spulenanordnung (18), die wenigstens zwei hintereinander angeordnete Spulen (18.1, 18.2) aufweist und die mit einer Spannungsversorgung und einer Signalerfassung (19) in Form einer Trägerfrequenzmeßbrücke in Verbindung steht, dadurch gekennzeichnet, daß der stabförmige Sensorteil (17) Mittel zur Verminderung von Störspannungen aufweist.
- Anordnung nach Anspruch 1, dadurch gekennzeichnet, daß zur Verminderung von Störspannungen Mittel zur Dämpfung von im stabförmigen Sensorteil (17) sich ausbreitenden Körperschallwellen vorgesehen sind.
- Anordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß als Mittel zur Dämpfung von Körperschallwellen das freie Ende des stabförmigen Sensorteils wenigstens eine zur Längsachse des stabförmigen Sensorteils geneigt verlaufende Endfläche aufweist.
- Anordnung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Endfläche durch ein konisch auslaufendes Endstück (24) gebildet wird.
- Anordnung nach Anspruch 1 und 2, dadurch gekennzeichnet, daß als Mittel zur Dämpfung von Körperschallwellen ein konisch auslaufendes Ende (24) am stabförmigen Sensorteil (17) vorgesehen ist.
- Anordnung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die axiale Ausnehmung (25) konisch zulaufend ausgebildet ist.
- Anordnung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Ausnehmung mit einem magnetisch durchlässigen Material (26) ausgefüllt ist, das einen anderen, vorzugsweise niedrigeren E-Modul aufweist, als das Material des ersten Sensorteils (17).
- Anordnung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß der aus einem weichmagnetischen Material, insbesondere einem Eisenwerkstoff bestehende stabförmige Sensorteil (17) als Mittel zur Unterdrückung von Störspannungen gehärtet ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10157120A DE10157120A1 (de) | 2000-11-28 | 2001-11-21 | Sensoranordnung zur Erfassung der Bewegung eines Ankers mit Unterdrückung von Störspannungen |
DE10157120 | 2001-11-21 | ||
PCT/EP2002/013003 WO2003044334A1 (de) | 2001-11-21 | 2002-11-20 | Sensoranordnung zur erfassung der bewegung eines ankers mit unterdrückung von störspannungen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1446560A1 EP1446560A1 (de) | 2004-08-18 |
EP1446560B1 true EP1446560B1 (de) | 2005-07-06 |
Family
ID=7706456
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02803393A Expired - Lifetime EP1446560B1 (de) | 2001-11-21 | 2002-11-20 | Sensoranordnung zur erfassung der bewegung eines ankers mit unterdrückung von störspannungen |
Country Status (6)
Country | Link |
---|---|
US (1) | US6891364B2 (de) |
EP (1) | EP1446560B1 (de) |
JP (1) | JP2005509873A (de) |
AT (1) | ATE299231T1 (de) |
AU (1) | AU2002356696A1 (de) |
WO (1) | WO2003044334A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2002333765A1 (en) * | 2002-08-30 | 2004-03-19 | Fev Motorentechnik Gmbh | Sensor assembly for detecting the movement of a controlling element, which has a short overall length and which is displaced back and forth by an actuator |
DE202005002372U1 (de) * | 2005-02-15 | 2005-04-21 | Knäbel, Horst, Dipl.-Ing. | Anordnung mit mehreren Messtastern |
DE102006051206A1 (de) * | 2006-10-30 | 2008-05-08 | Robert Bosch Gmbh | Kraftstoffinjektor mit einer Messeinrichtung |
DE102008015698B4 (de) * | 2008-03-26 | 2017-03-09 | Austriamicrosystems Ag | Sensoranordnung, integrierter Chipbaustein mit der Sensoranordnung und Messverfahren |
DE102009003258A1 (de) * | 2009-05-20 | 2010-11-25 | Robert Bosch Gmbh | Verfahren zu Messung des Ankerhubs in einem Kraftstoffinjektor |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB754917A (en) * | 1953-11-04 | 1956-08-15 | Daimler Benz Ag | Apparatus for measuring the movement of valve needles, particularly for fuel injection nozzles of internal combustion engines |
DE3347052A1 (de) * | 1983-12-24 | 1985-07-04 | Robert Bosch Gmbh, 7000 Stuttgart | Verfahren und vorrichtung zur messempfindlichkeitserhoehung von beruehrungsfrei arbeitenden wegmesssensoren |
US4866378A (en) * | 1988-01-22 | 1989-09-12 | Sunpower, Inc. | Displacement transducer with opposed coils for improved linearity and temperature compensation |
DE19739840C2 (de) * | 1997-09-11 | 2002-11-28 | Daimler Chrysler Ag | Verfahren zur Steuerung einer elektromagnetisch betätigbaren Stellvorrichtung, insbesondere eines Ventils für Brennkraftmaschinen |
JPH11148328A (ja) * | 1997-11-12 | 1999-06-02 | Fuji Heavy Ind Ltd | 電磁駆動バルブの開閉時期検出装置 |
DE19918993A1 (de) * | 1999-03-23 | 2000-09-28 | Daimler Chrysler Ag | Vorrichtung mit einem elektromagnetischen Aktuator |
JP3689614B2 (ja) * | 2000-03-21 | 2005-08-31 | 株式会社日立製作所 | 位置測定装置の磁石固定方法 |
JP2002048506A (ja) * | 2000-08-04 | 2002-02-15 | Matsushita Electric Ind Co Ltd | 電磁アクチュエータ用位置センサ |
-
2002
- 2002-11-20 JP JP2003545939A patent/JP2005509873A/ja active Pending
- 2002-11-20 WO PCT/EP2002/013003 patent/WO2003044334A1/de active IP Right Grant
- 2002-11-20 AT AT02803393T patent/ATE299231T1/de not_active IP Right Cessation
- 2002-11-20 AU AU2002356696A patent/AU2002356696A1/en not_active Abandoned
- 2002-11-20 EP EP02803393A patent/EP1446560B1/de not_active Expired - Lifetime
-
2004
- 2004-05-21 US US10/850,446 patent/US6891364B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
ATE299231T1 (de) | 2005-07-15 |
US6891364B2 (en) | 2005-05-10 |
JP2005509873A (ja) | 2005-04-14 |
WO2003044334A1 (de) | 2003-05-30 |
AU2002356696A1 (en) | 2003-06-10 |
EP1446560A1 (de) | 2004-08-18 |
US20040261735A1 (en) | 2004-12-30 |
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