GB2321341A - Integration of devices comprising coils and permeable magnetic cores - Google Patents

Integration of devices comprising coils and permeable magnetic cores Download PDF

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Publication number
GB2321341A
GB2321341A GB9726922A GB9726922A GB2321341A GB 2321341 A GB2321341 A GB 2321341A GB 9726922 A GB9726922 A GB 9726922A GB 9726922 A GB9726922 A GB 9726922A GB 2321341 A GB2321341 A GB 2321341A
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GB
United Kingdom
Prior art keywords
devices
coils
magnet core
coil
arrangement
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
GB9726922A
Other versions
GB2321341B (en
GB9726922D0 (en
Inventor
Andreas Teichmann
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.)
ZF CV Systems Hannover GmbH
Original Assignee
Wabco 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 Wabco GmbH filed Critical Wabco GmbH
Publication of GB9726922D0 publication Critical patent/GB9726922D0/en
Publication of GB2321341A publication Critical patent/GB2321341A/en
Application granted granted Critical
Publication of GB2321341B publication Critical patent/GB2321341B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • G01D5/204—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 mutual induction between two or more coils
    • G01D5/2046—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 mutual induction between two or more coils by a movable ferromagnetic element, e.g. a core
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
    • B60G17/019—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by the type of sensor or the arrangement thereof
    • B60G17/01933—Velocity, e.g. relative velocity-displacement sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/44—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction
    • F16F9/46—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction allowing control from a distance, i.e. location of means for control input being remote from site of valves, e.g. on damper external wall
    • F16F9/463—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction allowing control from a distance, i.e. location of means for control input being remote from site of valves, e.g. on damper external wall characterised by electrical connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/44—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction
    • F16F9/46—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction allowing control from a distance, i.e. location of means for control input being remote from site of valves, e.g. on damper external wall
    • F16F9/466—Throttling control, i.e. regulation of flow passage geometry
    • 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
    • G01D5/2013—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 by a movable ferromagnetic element, e.g. a core
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/25—Stroke; Height; Displacement
    • B60G2400/252—Stroke; Height; Displacement vertical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2401/00—Indexing codes relating to the type of sensors based on the principle of their operation
    • B60G2401/17—Magnetic/Electromagnetic

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetically Actuated Valves (AREA)
  • Vehicle Body Suspensions (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

A coil and core arrangement comprises at least two devices 3, 17 in which each device 3, 17 has at least one coil 5, 19 and at least one permeable magnetic core 16, 23, 28, wherein at least two coils 5, 19 are arranged with a magnetic core part 23 which is common to each of the magnetic paths associated with each of the coils. The coils 5, 19 may be coaxial and arranged physically in series. The devices 3, 17 may be position sensors and/or solenoid actuators. The arrangement may be used for a position sensor and solenoid valve arrangement used in the pneumatic suspension system of a vehicle. The integration of such devices may reduce the number of interconnections required and thereby may improve the operational reliability of the devices.

Description

2321341 IMPROVEMENTS IN OR RELATING TO DEVICES HAVING COILS WITH
MAGNETICALLY PERMEABLE CORES.
The invention relates to an arrangement containing a plurality of devices, each having at least one coil with a magnetically permeable core, and especially to a combined movement sensor and control valve for use in a pneumatic suspension for a motor vehicle.
DE 43 27 763 A1 describes a system part associated with a respective axle side in the pneumatic shock absorption system. In that arrangement, a displacement sensor and a solenoid valve constitute devices each having a coil with a magnetically permeable core. In that known arrangement, as is generally common, the said devices are in the form of independent assemblies. The construction of the said devices as independent assemblies gives rise to a complicated arrangement.
It is an object of the invention to produce a less complicated arrangement by simple means.
The present invention provides an arrangement comprising at least two devices, each having at least one coil with a magnetically permeable core, wherein at least two said coils are arranged physically in series and enclose a component common to both that acts at least as one magnet core part for each coil.
Advantageous practical forms and applications are specified in the subsidiary claims.
The outlay associated with the construction of the said devices as independent assemblies in the known arrangement is further increased by the fact that the independent assemblies within the arrangement require separate electrical connections to each other andlor to electrical control devices. By way of contrast, the invention enables the number of electrical connections to be reduced.
The invention can be constructed with any desired number of devices of any desired types, provided that their function is guaranteed thereby.
The invention is applicable to all technical fields in which devices of the kind mentioned in the introduction are used.
Further advantages of the invention are listed in the following explanation referring to an exemplary embodiment illustrated in the drawings, in which:
-2Fig. 1 shows an arrangement with two devices., and Figs 2 and 3 show partial sections along the line A-A in Fig. 1, in two different operating positions.
Referring to the accompanying drawings, and initially to Fig. 1, one form of arrangement according to the invention combines an inductive displacement sensor 3 in the form of an angle-of-rotation sensor and a solenoid valve 17, each of which is a device having a coil and a magnetically permeable core.
The angle-of-rotation sensor 3 comprises a sensor coil 5 and a divided magnet core 23 & 28. The solenoid valve 17 comprises a valve coil 19 and a magnet core 16 & 23, which is also divided. The coils 4 and 19 are arranged end to end and surround a component 23 common to both. This common component 23 is a magnet core part both for the displacement sensor 3 and for the solenoid valve 17, and is fixed relative to the two coils 5 and 19. The common component 23 has an axial bore 8, and the other magnet core part 28 of the angle-of-rotation sensor 3 has an axial bore 1, which will be discussed below. The other magnet core part 28 of the displacement sensor 3 and the other magnet core part 16 of the solenoid valve 17 are movable relative to the respective coil 5, 19 and thus also relative to the common component 23. The mobility of the other magnet core part 28 of the displacement sensor 3 comprises the ability to rotate about the axis of the coil and the mobility of the other magnet core part 16 of the displacement sensor 3 comprises the ability to be displaced axially.
The coils 5 and 19 are wound onto coil carriers 6 and 10, respectively, having internal, axial apertures. The common component 23 is received in the internal apertures.
Incorporated in the coil carrier 6 of the displacement sensor 3, and projecting into the aperture of that coil carrier, is a spacer element 25, which prevents contact in the longitudinal direction between the common component 23 and the other magnet core part 28 of the displacement sensor 3. The spacer element 25 extends over only a portion of the circumference of the coil carrier 6. The rotatable magnet core part 28 of the displacement sensor 3 has an axially projecting portion 26, in the form of a sector of a cylindrical shell, that overlaps with the spacer element 25, so that the rotatable magnet core part 28 is rotatable in the aperture of the coil carrier 6 within limits set by the flanks 30 and 33 of the spacer element 25 abutting respective flanks 31 and 32 of the shell 26 facing them (see Figs. 2 and 3). The shell 26 and the spacer element 25 are shaped so as not to project into the axial bore 1, 8.
-3In addition, the other magnet core part 16 of the solenoid valve 17 is slidably guided in the aperture of the coil carrier 10 of the solenoid valve 17.
With their ends remote from the common component 23, the other magnet core parts 28 and 16 project from the respective associated coil 5 and 19.
The coils 5 and 19, the common component 23 and the regions of the other magnet core parts 28, 16 located inside the coils 5, 19 are surrounded by a housing 11, 20, 27, which consists of a housing jacket 20 enclosing the two coils 5, 19, and therefore common to both coils 5, 19, and of end walls 11 and 27, and are fixed in this housing. The housing 11, 20, 27 is illustrated assembled from the housing jacket 20 and separate end pieces 11, 27. In a manner not illustrated, the housing jacket and one or both end walls could alternatively be made in one part. Likewise in a manner not illustrated, the housing jacket illustrated as one part can be constructed in several parts, and one or both end walls can be formed on a respective part.
Inside the housing 11, 20, 27, a partition wall 24 through which the common component 23 passes is arranged between the coils 5 and 19. This partition wall is illustrated as an independent part, but could alternatively be integral with the housing jacket 20 or, if applicable, with a part thereof.
The housing jacket 20, the end walls 11, 27 and the partition wall 24 consist, like the common component 23 and the other magnet core parts 16, 28, of a magnetically permeable material, iron being the first choice. They therefore serve also as magnet yokes for the magnetic circuit of displacement sensor 3 and the solenoid valve 17. The magnetic circuit of the displacement sensor 3 runs via the end wall 27, the region of the housing jacket 20 enclosing the coil 5, the partition wall 24, the part of the common component 23 surrounded by the coil 5 and the other magnet core part 28 back to the end wall 27. The magnetic circuit of the solenoid valve 17 runs correspondingly.
It is apparent that the partition wall 24 is exposed to especially high magnetic loading, because it lies in the magnetic flux of both coils 5, 19. Since magnetic saturation of the partition wall 24 could falsify the signal of the displacement sensor 3, precautions may need to be taken to ensure that magnetic saturation does not occur in the magnetic circuit of the displacement sensor 3. The partition wall 24 may be formed with a correspondingly large cross-section, or may be constructed in two, preferably spaced, layers, In a manner not illustrated, the devices can also be constructed without a common housing jacket.
The solenoid valve 17, considered on its own, is of a known type of construction, as described, for example, in DE 26 39 393 AI. In this type of construction, two stop members limit the displacement of the movable magnet core part 16 of the solenoid valve 17. The one stop member is in the form of an inlet valve seat 15 on a housing cover 13, which is placed on the housing 11, 20, 27 on the outside of the end wall 11 of the housing associated with the valve coil 19. The other stop member is in the form of an outlet valve seat 21 on the common component 23, surrounding the open end of the axial bore 8.
The housing cover 13 also contains an axial inlet 14 that opens into the inside of the inlet valve seat 15 and is to be connected to a pressure supply, and also a working connection 12 to be connected to pressure loads. The outlet channel that runs from the inside of the outlet valve seat 21 comprises the internal aperture 8 of the component 23, and the internal aperture 1 of the other magnet core part 28.
When the valve coil 19 is not supplied with current, the movable magnet core part 16 of the solenoid valve 17 is held by a spring, not illustrated more specifically, against the inlet valve seat 15; this seat is consequently blocked, but the outlet valve seat 21 is open and a connection is produced between the working connection 12 and the outlet channel 8, 1. This connection runs by way of longitudinal channels 18 in the envelope surface of the 20 movable magnet core part 16 of the solenoid valve 17.
When the valve coil 19 is supplied with current, the movable magnet core part 16 of the displacement sensor 17 is drawn towards the outlet valve seat 21, with the result that the outlet valve becomes closed, but the inlet valve 15 opens. A connection is thus produced between the inlet 14 and the working connection 12, and the load is thus supplied with 25 pressure.
For the purpose of ensuring a reliable seal, sealing elements not illustrated more specifically are inserted in the regions of the other magnet core part 16 coming into engagement with the valve seat 15, 21. These sealing elements can consist, for example, of an elastomer.
To form the displacement sensor 3, the common component 23 and the other magnet core part 28 of the displacement sensor 3 are constructed as follows. The end face of the region of the common component 23 surrounded by the sensor coil 5 is partially set back in such -5a manner that over a part of its external circumference a shell 4 having the shape of a segment of a circle remains. On the end of the other magnet coil part 28 facing the common component 23 there is formed the shell 26 which also has the plan of a segment of a circle. The external diameter of the shell 26 is smaller than the internal diameter of the shell 4 of the common component 23 to such an extent that the shell 26 can be rotated inside the shell 4 with a minimum possible air gap.
If the movable magnet core part 28 of the displacement sensor 3 is rotated then, depending on the starting position, the shell 26 formed thereon moves into, or further into, or out of the shell 4 of the common component 23. As this happens, the size of the area covered over by the shells 4 and 26 changes. This change results in a change in the magnitude of the inductance of the coil 5, which forms the angle of rotation signal of the displacement sensor 3.
A set of electrical contacts 7 for the electrical connections of the displacement sensor 3 and the solenoid valve 17 is provided on the outside of the arrangement.
The reference number 9 indicates a printed circuit board. This is intended to denote that an electricallelectronic signal-evaluating and/or control device can be attached to the arrangement, so that the arrangement can be expanded to a module that is electrically independent apart from the voltage supply. As shown in Fig. 1, the circuit board 9 may be mounted on the outside of the arrangement so that it makes direct connection with the contacts 7.
In Fig. 2, the other magnet core part 28 of the displacement sensor 3 is shown rotated into a position in which its shell 26 is located completely outside the shell 4 of the common component 23. In that position, there is no overlap between the surfaces of the shells 4 and 26, and the magnetic resistance in the magnetic circuit of the displacement sensor 3 reaches a maximum.
In Fig. 3, the other magnet core part 28 of the displacement sensor 3 is shown rotated into the position with the largest value of overlapped area between the shells 4 and 26. In that position of the shells 4 and 26 relative to one another, the magnetic resistance in the magnetic circuit of the displacement sensor 3 reaches a minimum. In the positions between the illustrated positions the size of the overlapped area, and thus of the magnetic resistance, changes continuously.
in the operational state, the arrangement is secured to an article, as indicated by 22, in a suitable manner, for example, by screwing on the housing 11, 20, 27 or the housing cover 13. To initiate a rotational movement, in this case it is assumed that the end of the other magnet core part 28 of the displacement sensor 3 passing through the associated end wall 27 is connected in a suitable manner to a rotary lever 2. In general, this represents an article of which the movement relative to the article 22 is to be detected by the displacement sensor 3.
The above-described arrangement is suitable, for example, as a control unit for a pneumatic suspension system with a levelling control in vehicle engineering. In such a case, the article 22 is a sprung vehicle chassis part, for example, a frame, and the angle of the rotary lever 2 is a measure of the height of one or more vehicle parts above the ground or a measure of the height of a pneumatic spring- The present invention can be implemented also with combinations of devices other than the devices mentioned in the embodiment. In this respect, a travel sensor, which detects the displacement of two objects relative to one another, or the combination of two sensors are mentioned merely by way of example. Equally, in accordance with the invention it is possible to arrange the coils of more than two devices in series around a common component that forms the magnet core or one or more magnet core parts for the coils. The decisive factor for the applicability of the present invention in such a case is likely to be the opportunity for safeguarding the function of the devices.

Claims (8)

Claims
1. Arrangement comprising at least two devices, each having at least one coil with a magnetically permeable core, wherein at least two said coils are arranged physically in series and enclose a component common to both that acts at least as one magnet core part for each coil.
2. Arrangement according to claim 1, wherein one said device is a displacement sensor having a divided magnet core and being arranged to detect the movement of two articles relative to one another, one part of the divided magnet core is connected to one of the two articles, and the other magnet core part is formed by the component common to 10 the coils and is connected to the other article.
3. Arrangement according to claim 2, wherein the said one device is arranged to detect a displacement of the articles relative to one another.
4. Arrangement according to claim 2, wherein the said one device is arranged to detect a rotation of the articles relative to one another.
5. Arrangement according to any one of claims 2 to 4, wherein another said device is a second displacement sensor.
6. Arrangement according to any one of claims 1 to 5, wherein one of the said devices is a solenoid valve 17.
7. Arrangement according to any one of the preceding claims, wherein the coils are 20 enclosed by a common housing jacket made of a magnetically permeable material.
8. Arrangement substantially as hereinbefore described with reference to, and as shown in, the accompanying drawings.
GB9726922A 1996-12-20 1997-12-19 Improvements in or relating to devices having coils with magnetically permeable cores Expired - Fee Related GB2321341B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1996153396 DE19653396B4 (en) 1996-12-20 1996-12-20 Device with a valve and a displacement sensor

Publications (3)

Publication Number Publication Date
GB9726922D0 GB9726922D0 (en) 1998-02-18
GB2321341A true GB2321341A (en) 1998-07-22
GB2321341B GB2321341B (en) 2000-11-22

Family

ID=7815612

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9726922A Expired - Fee Related GB2321341B (en) 1996-12-20 1997-12-19 Improvements in or relating to devices having coils with magnetically permeable cores

Country Status (3)

Country Link
DE (1) DE19653396B4 (en)
FR (1) FR2757629B1 (en)
GB (1) GB2321341B (en)

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Publication number Priority date Publication date Assignee Title
DE19811431A1 (en) * 1998-03-17 1999-09-23 Hella Kg Hueck & Co Vehicle level sensor
DE202004014323U1 (en) * 2004-09-15 2006-02-02 Ab Elektronik Gmbh Sensor unit for motor vehicle has acceleration sensor that measures acceleration, and two height sensors that separately detect heights of axle and coupler

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GB1070032A (en) * 1964-08-06 1967-05-24 Electro Craft Corp Improvements in or relating to combined motor-generators
GB2036411A (en) * 1978-11-15 1980-06-25 Sony Corp Gramophone record player tone arm driving apparatuses
GB2217849A (en) * 1988-04-22 1989-11-01 English Electric Co Ltd Position sensor
US5199459A (en) * 1991-05-08 1993-04-06 Valve Tech, Inc. Dual series valve

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DE2361385C3 (en) * 1973-12-10 1978-09-07 Max-Planck-Gesellschaft Zur Foerderung Der Wissenschaften E.V., 3400 Goettingen Mec hanoelectric transmitter
IT1203020B (en) * 1976-06-25 1989-02-15 Trevisan Giovanni DIVERTER INTERCEPTOR DEVICE FOR THREE-WAY SOLENOID VALVE NORMALLY CLOSED
DE2631846C2 (en) * 1976-07-15 1978-08-03 G.L. Rexroth Gmbh, 8770 Lohr Inductive displacement transducer for hydraulic devices
DE2914195B1 (en) * 1979-04-07 1980-05-14 Rexroth Gmbh G L Inductive transmitter for a fluidic actuator
DE3242537A1 (en) * 1982-11-18 1984-05-24 Robert Bosch Gmbh, 7000 Stuttgart Electromagnetic actuating device
DE3713562C2 (en) * 1987-04-23 1995-10-19 Pierburg Gmbh Method for determining the position of control elements with inductive displacement sensors
FR2650666B2 (en) * 1988-10-10 1995-01-13 Gec Alsthom Sa DEVICE FOR MEASURING THE ANGULAR POSITION AND THE LINEAR DISPLACEMENT OF TWO WORKPIECES IN RELATION TO ONE ANOTHER
DE4001544A1 (en) * 1990-01-20 1991-07-25 Bosch Gmbh Robert MEASURING DEVICE FOR DETERMINING A TURNING ANGLE
US5172298A (en) * 1990-01-09 1992-12-15 Honda Giken Kogyo Kabushiki Kaisha Electromagnetic actuator
DE4327763B4 (en) * 1993-08-18 2004-02-12 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Air suspension system
DE4330540C1 (en) * 1993-09-09 1995-03-30 Kostal Leopold Gmbh & Co Kg Inductive sensor device
DE4335805A1 (en) * 1993-10-20 1995-04-27 Bayerische Motoren Werke Ag Circuit arrangement for detecting at least one marking assigned to an angle of rotation (angle of revolution) position of a shaft
DE19511436A1 (en) * 1995-03-29 1996-10-02 Oelsch Fernsteuergeraete Control signal generator for generating multiple control signals using a single control lever

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1070032A (en) * 1964-08-06 1967-05-24 Electro Craft Corp Improvements in or relating to combined motor-generators
GB2036411A (en) * 1978-11-15 1980-06-25 Sony Corp Gramophone record player tone arm driving apparatuses
GB2217849A (en) * 1988-04-22 1989-11-01 English Electric Co Ltd Position sensor
US5199459A (en) * 1991-05-08 1993-04-06 Valve Tech, Inc. Dual series valve

Also Published As

Publication number Publication date
GB2321341B (en) 2000-11-22
DE19653396A1 (en) 1998-06-25
GB9726922D0 (en) 1998-02-18
FR2757629A1 (en) 1998-06-26
DE19653396B4 (en) 2005-10-06
FR2757629B1 (en) 2000-03-03

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