FR2860070A1 - Displacement sensor for detecting height variations of motor vehicles suspension system, has electrical circuit detecting variation of inductance/impedance of conducting wire based on metallic units position with respect to support length - Google Patents
Displacement sensor for detecting height variations of motor vehicles suspension system, has electrical circuit detecting variation of inductance/impedance of conducting wire based on metallic units position with respect to support length Download PDFInfo
- Publication number
- FR2860070A1 FR2860070A1 FR0311062A FR0311062A FR2860070A1 FR 2860070 A1 FR2860070 A1 FR 2860070A1 FR 0311062 A FR0311062 A FR 0311062A FR 0311062 A FR0311062 A FR 0311062A FR 2860070 A1 FR2860070 A1 FR 2860070A1
- Authority
- FR
- France
- Prior art keywords
- flat
- support
- displacement sensor
- length
- triangle
- 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.)
- Pending
Links
- 238000006073 displacement reaction Methods 0.000 title claims description 18
- 239000000725 suspension Substances 0.000 title claims description 13
- 239000002184 metal Substances 0.000 claims description 15
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 230000004048 modification Effects 0.000 claims description 6
- 238000012986 modification Methods 0.000 claims description 6
- 239000003302 ferromagnetic material Substances 0.000 claims description 4
- 239000012777 electrically insulating material Substances 0.000 claims description 3
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 3
- 239000006096 absorbing agent Substances 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 150000001879 copper Chemical class 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000000463 material Substances 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
-
- 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
- G01D5/202—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 movable a non-ferromagnetic conductive element
-
- 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
- B60G2401/10—Piezoelectric elements
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
Description
La présente invention concerne un capteur de déplacement.The present invention relates to a displacement sensor.
L'invention vise notamment l'application de ce capteur de déplacement à la détection des variations de la hauteur d'une suspension de véhicule automobile. The invention relates in particular to the application of this displacement sensor to the detection of variations in the height of a motor vehicle suspension.
Dans une suspension d'automobile réglable en hauteur par exemple au moyen d'un système hydraulique, il est nécessaire de détecter la hauteur de la suspension, au moyen d'un capteur de déplacement. In an automobile suspension adjustable in height for example by means of a hydraulic system, it is necessary to detect the height of the suspension, by means of a displacement sensor.
La façon la plus appropriée d'incorporer ce capteur dans la suspension du véhicule automobile est de l'intégrer dans un amortisseur de la suspension. The most appropriate way of incorporating this sensor into the suspension of the motor vehicle is to integrate it into a shock absorber of the suspension.
Le but de la présente invention est de proposer un nouveau capteur de déplacement, de conception simple c'est-à-dire constitué d'un nombre réduit d'éléments, particulièrement bien adapté à être incorporé dans une suspension de véhicule automobile pour détecter des variations de hauteur. The object of the present invention is to propose a new displacement sensor, of simple design that is to say consisting of a reduced number of elements, particularly well suited to be incorporated in a motor vehicle suspension to detect height variations.
Suivant l'invention, ce capteur de déplacement est caractérisé en ce qu'il comprend un support plan en matière électriquement isolante, de forme rectangulaire sur lequel est disposé un fil conducteur enroulé à plat en forme de spirale comportant des brins parallèles à la longueur du support et des brins parallèles à la largeur de ce support, ce fil conducteur enroulé à plat étant recouvert partiellement par un élément métallique plat allongé de section croissante entre l'une des extrémités et l'autre extrémité du support plan, un autre élément plat métallique s'étendant transversalement par rapport à la longueur du support en recouvrant partiellement l'élément plat, et pouvant se déplacer par rapport à cette longueur, un circuit électrique étant prévu pour alimenter le fil conducteur enroulé à plat par un courant alternatif et pour détecter une variation de l'inductance ou de l'impédance du fil conducteur enroulé en fonction de la position de l'élément métallique plat déplaçable par rapport à la longueur du support. According to the invention, this displacement sensor is characterized in that it comprises a plane support of electrically insulating material, of rectangular shape on which is disposed a conductive wire wound flat in the form of a spiral having strands parallel to the length of the support and strands parallel to the width of this support, the conductive wire wound flat is partially covered by an elongate flat metal element of increasing cross section between one end and the other end of the flat support, another flat metal element extending transversely with respect to the length of the support, partially covering the flat element, and able to move relative to this length, an electrical circuit being provided for feeding the conductive wire wound flat by an alternating current and for detecting a variation of the inductance or impedance of the wound conductor wire according to the position of the lement metal movable plate with respect to the length of the support.
De préférence, ledit élément métallique a la forme d'un triangle dont le sommet est situé près de l'une des extrémités du support plan. Preferably, said metal element has the shape of a triangle whose apex is located near one of the ends of the plane support.
Selon un premier mode de réalisation, l'élément plat en forme de triangle est en matériau ferromagnétique et l'élément plat déplaçable par rapport à la longueur du support est un aimant, ledit circuit électrique étant adapté pour détecter une variation d'inductance due à une modification de la surface de recouvrement entre l'aimant et l'élément en forme de triangle en fonction de la position dudit aimant. According to a first embodiment, the flat element in the form of a triangle is made of ferromagnetic material and the flat element displaceable with respect to the length of the support is a magnet, said electrical circuit being adapted to detect a variation of inductance due to a modification of the overlap surface between the magnet and the triangle-shaped element as a function of the position of said magnet.
Dans ce mode de réalisation, l'élément plat est de préférence en matériau ferromagnétique saturable, par exemple en mumétal (alliage Fer-Nickel). In this embodiment, the flat element is preferably made of saturable ferromagnetic material, for example mumetal (iron-nickel alloy).
Dans un second mode de réalisation, l'élément plat en forme de triangle et l'élément plat déplaçable par rapport à la longueur du support sont en métal conducteur, ledit circuit électrique étant adapté pour mesurer une variation d'impédance générée par des courants de Foucault due à une modification de la surface de recouvrement entre l'élément plat déplaçable et l'élément en forme de triangle en fonction de la position dudit élément plat déplaçable. In a second embodiment, the flat element in the form of a triangle and the flat element displaceable with respect to the length of the support are made of conductive metal, said electrical circuit being adapted to measure an impedance variation generated by currents of Foucault due to a modification of the overlap surface between the displaceable flat element and the triangle-shaped element as a function of the position of said displaceable flat element.
Le capteur selon l'invention est particulièrement bien adapté à la détection des variations de la hauteur de la suspension d'un véhicule automobile. The sensor according to the invention is particularly well suited to detecting variations in the height of the suspension of a motor vehicle.
Dans cette application, le capteur de déplacement selon l'invention est de préférence intégré à un amortisseur de la suspension, le support de ce capteur étant solidaire du cylindre de l'amortisseur et l'élément déplaçable de ce capteur étant solidaire de la tige ou du piston de l'amortisseur. In this application, the displacement sensor according to the invention is preferably integrated with a shock absorber of the suspension, the support of this sensor being secured to the cylinder of the damper and the movable element of this sensor being secured to the rod or of the damper piston.
D'autres particularités et avantages de l'invention apparaîtront encore tout au long de la description ci-après. Other features and advantages of the invention will become apparent throughout the description below.
Aux dessins annexés donnés à titres d'exemples non limitatifs: - la figure 1 est une vue en plan d'un premier mode de réalisation d'un capteur de déplacement selon l'invention, - la figure 2 est une vue en coupe suivant le plan II-II de la figure 1, - la figure 3 est une vue en plan d'un second mode de réalisation d'un capteur de déplacement selon l'invention, - la figure 4 est une vue en coupe suivant le plan IV-IV de la figure 3. In the accompanying drawings given by way of nonlimiting examples: FIG. 1 is a plan view of a first embodiment of a displacement sensor according to the invention, FIG. 2 is a sectional view according to FIG. 2-II of FIG. 1; FIG. 3 is a plan view of a second embodiment of a displacement sensor according to the invention; FIG. 4 is a sectional view along plane IV. IV of Figure 3.
Dans la version représentée sur les figures 1 à 4 le capteur de déplacement, comprend un support plan 1 en matière électriquement isolante, de forme rectangulaire sur lequel est disposé un fil conducteur 2 enroulé à plat en forme de spirale comportant des brins parallèles à la longueur du support 1 et des brins parallèles à la largeur de ce support 1. In the version shown in FIGS. 1 to 4, the displacement sensor comprises a flat support 1 made of electrically insulating material, of rectangular shape on which is disposed a conductive wire 2 wound flat in the form of a spiral having strands parallel to the length support 1 and strands parallel to the width of this support 1.
Ce fil conducteur 2 enroulé à plat est recouvert partiellement par un élément métallique plat 3 en forme de triangle dont le sommet est situé près de l'une des extrémités du support plan 1 et la base est située près de l'autre extrémité de ce support. This conductive wire 2 wound flat is partially covered by a flat metal element 3 in the shape of a triangle whose apex is located near one of the ends of the flat support 1 and the base is located near the other end of this support .
Par ailleurs, un élément plat métallique 4 s'étend transversalement par rapport à la longueur du support 1 en recouvrant partiellement l'élément plat 3 en forme de triangle, et pouvant se déplacer par rapport à cette longueur. Furthermore, a flat metal element 4 extends transversely with respect to the length of the support 1 partially covering the flat element 3 in the form of a triangle, and can move relative to this length.
Un circuit électrique (non représenté) est prévu pour alimenter le fil conducteur 2 enroulé à plat par un courant alternatif et pour détecter une variation de l'inductance ou de l'impédance du fil conducteur 2 enroulé en fonction de la position de l'élément métallique plat 3 par rapport à la longueur du support 1. An electric circuit (not shown) is provided for feeding the conductive wire 2 wound flat by an alternating current and for detecting a variation of the inductance or the impedance of the wound wire 2 as a function of the position of the element. flat metal 3 with respect to the length of the support 1.
Dans la version représentée sur les figures 1 et 2, l'élément plat 3 en forme de triangle est en métal ferromagnétique saturable, de préférence en mumétal, et l'élément plat 4 déplaçable par rapport à la longueur du support 1 est un aimant permanent. In the version shown in FIGS. 1 and 2, the flat element 3 in the form of a triangle is made of saturable ferromagnetic metal, preferably in mumetal, and the flat element 4 displaceable with respect to the length of the support 1 is a permanent magnet .
Dans cette version, le circuit électrique est adapté pour détecter une variation d'inductance due à une modification de la surface de recouvrement entre l'aimant 4 et l'élément en forme de triangle 3 en fonction de la position dudit aimant 4. In this version, the electrical circuit is adapted to detect an inductance variation due to a modification of the overlap surface between the magnet 4 and the triangle-shaped element 3 as a function of the position of said magnet 4.
Le fil conducteur 2 enroulé à plat peut être appliqué sur le support isolant 1, sous forme de piste en cuivre, comme dans le cas des circuits imprimés. The conductive wire 2 wound flat can be applied to the insulating support 1 in the form of a copper track, as in the case of printed circuits.
Le support isolant 1 peut être en PCB, matière qui est communément utilisée dans les circuits imprimés. The insulating support 1 may be in PCB, a material which is commonly used in printed circuits.
Le circuit pour mesurer les variations d'inductance du fil enroulé 2 dues à la modification de la position de l'aimant 4 par rapport à l'élément en forme de triangle 3, ne sera pas décrit ici, car il est à la portée des connaissances de l'homme du métier. The circuit for measuring the inductance variations of the wound wire 2 due to the change in the position of the magnet 4 relative to the triangle-shaped element 3, will not be described here because it is within the range of knowledge of the skilled person.
Dans la version représentée sur les figures 3 et 4, l'élément plat en forme de triangle 3 et l'élément plat déplaçable 4 par rapport à la longueur du support 1 sont en métal conducteur. In the version shown in Figures 3 and 4, the flat element shaped triangle 3 and the movable flat member 4 relative to the length of the support 1 are conductive metal.
Le circuit électrique est dans ce cas adapté pour mesurer une variation d'impédance générée par des courants de Foucault due à une modification de la surface de recouvrement entre l'élément plat déplaçable 4 et l'élément en forme de triangle 3 en fonction de la position de cet élément plat déplaçable. In this case, the electrical circuit is adapted to measure an impedance variation generated by eddy currents due to a modification of the overlap surface between the displaceable flat element 4 and the triangle-shaped element 3 as a function of the position of this movable flat element.
De la description ci-dessus, il ressort que le capteur de déplacement selon l'invention est de conception particulièrement simple. From the description above, it appears that the displacement sensor according to the invention is particularly simple design.
A cet effet, le capteur est particulièrement bien adapté à la détection des variations de la hauteur de la suspension d'un véhicule automobile. For this purpose, the sensor is particularly suitable for detecting variations in the height of the suspension of a motor vehicle.
Dans cette application le capteur de déplacement peut être intégré à un amortisseur de la suspension. Dans ce cas, le support 1 de ce capteur peut être rendu solidaire du cylindre de l'amortisseur et l'élément déplaçable 4 de ce capteur peut être rendu solidaire de la tige ou du piston de l'amortisseur. In this application the displacement sensor can be integrated with a shock absorber of the suspension. In this case, the support 1 of this sensor can be made integral with the damper cylinder and the displaceable element 4 of this sensor can be made integral with the rod or the piston of the damper.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0311062A FR2860070A1 (en) | 2003-09-22 | 2003-09-22 | Displacement sensor for detecting height variations of motor vehicles suspension system, has electrical circuit detecting variation of inductance/impedance of conducting wire based on metallic units position with respect to support length |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0311062A FR2860070A1 (en) | 2003-09-22 | 2003-09-22 | Displacement sensor for detecting height variations of motor vehicles suspension system, has electrical circuit detecting variation of inductance/impedance of conducting wire based on metallic units position with respect to support length |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR2860070A1 true FR2860070A1 (en) | 2005-03-25 |
Family
ID=34224378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR0311062A Pending FR2860070A1 (en) | 2003-09-22 | 2003-09-22 | Displacement sensor for detecting height variations of motor vehicles suspension system, has electrical circuit detecting variation of inductance/impedance of conducting wire based on metallic units position with respect to support length |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2860070A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015140080A1 (en) * | 2014-03-17 | 2015-09-24 | Tt Electronic Technology Limited | Position sensing apparatus and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2800458A1 (en) * | 1999-10-27 | 2001-05-04 | Siemens Automotive Sa | Electronic steering column-mounted module for motor vehicles, uses magnetic coupling to detect steering column rotation and operation of control levers to provide control information and information for steering assistance |
| US20010052771A1 (en) * | 2000-05-24 | 2001-12-20 | Balluff Gmbh | Position measuring system |
| FR2830614A1 (en) * | 2001-10-09 | 2003-04-11 | Siemens Vdo Automotive | Non-contact inductive position sensor, especially for automotive use, comprises transmission and receiver coils sandwiched between plates of high magnetic permeability so that coupling changes in response to a mobile magnet |
-
2003
- 2003-09-22 FR FR0311062A patent/FR2860070A1/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2800458A1 (en) * | 1999-10-27 | 2001-05-04 | Siemens Automotive Sa | Electronic steering column-mounted module for motor vehicles, uses magnetic coupling to detect steering column rotation and operation of control levers to provide control information and information for steering assistance |
| US20010052771A1 (en) * | 2000-05-24 | 2001-12-20 | Balluff Gmbh | Position measuring system |
| FR2830614A1 (en) * | 2001-10-09 | 2003-04-11 | Siemens Vdo Automotive | Non-contact inductive position sensor, especially for automotive use, comprises transmission and receiver coils sandwiched between plates of high magnetic permeability so that coupling changes in response to a mobile magnet |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015140080A1 (en) * | 2014-03-17 | 2015-09-24 | Tt Electronic Technology Limited | Position sensing apparatus and method |
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