EP0432101A1 - Multiplex measuring device with a plurality of sensors - Google Patents

Multiplex measuring device with a plurality of sensors Download PDF

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Publication number
EP0432101A1
EP0432101A1 EP90810943A EP90810943A EP0432101A1 EP 0432101 A1 EP0432101 A1 EP 0432101A1 EP 90810943 A EP90810943 A EP 90810943A EP 90810943 A EP90810943 A EP 90810943A EP 0432101 A1 EP0432101 A1 EP 0432101A1
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EP
European Patent Office
Prior art keywords
sensors
supply
sensor
multiplexing
conductors
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Granted
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EP90810943A
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German (de)
French (fr)
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EP0432101B1 (en
Inventor
Daniel Hobmaier
José Barros
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Baumer Electric AG
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EUCRON SA
EUCRON SA
Baumer Electric AG
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C15/00—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path
    • G08C15/06—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path successively, i.e. using time division
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/38—Electric signal transmission systems using dynamo-electric devices

Definitions

  • the present invention relates to a measuring device comprising two or more sensors for one or more quantities to be measured, these sensors being arranged to be connected to an electrical power source and to supply, on output conductors, signals depending on the quantity to be measured, the device further comprising devices for transmitting and processing the sensor output signals.
  • the invention applies more particularly to a device for indicating the absolute angular position of a shaft, comprising position sensors with a rotary member, the rotary member of a first sensor being mechanically coupled with said shaft, and the rotary members of the other sensor or sensors being successively coupled to that of the first sensor by means of gears, these sensors being arranged to be supplied by a sinusoidal or pulse voltage, and to provide output signals as a function of the angular position of their rotating organ.
  • the sensors In such devices, the sensors must be connected, on the one hand, to a power source and, on the other hand, to a device for processing their output signals.
  • these output signals appear at the terminals of two phases and therefore require up to four conductors per sensor for their transmission to the processing device generally located at a certain distance. sensors.
  • the number of sensors used depends on the working field of the device, i.e. the maximum number of revolutions of the input shaft that the device allows to indicate, so that a large number of connecting conductors is often necessary, which in practice is a significant drawback.
  • gears with high reduction ratio can be used between the various sensors, so as to reduce the number of sensors required for a given field of work.
  • this solution requires very precise sensors and gears, and therefore leads to relatively high cost prices of the entire device.
  • the invention aims to provide a device of the type mentioned at the start, in which the number of connecting conductors between the sensors and a signal processing device and a power supply device can be substantially reduced, while also making it possible to reduce, in some cases significantly, the cost price of the entire device.
  • the device comprises a supply and multiplexing assembly connected to said sensors and connected, moreover, on the one hand by means of a number of conductors at least approximately equal to that of said output conductors from a single sensor, to the signal processing device and, on the other hand, to a multiplexing supply and control device.
  • the number of connecting conductors thus becomes independent of the number of sensors.
  • the number of sensors can, for example, be increased so as to allow the use of lower reduction ratios, or more generally fewer teeth, and therefore significantly less expensive gears.
  • the first sensor directly coupled to the input shaft whose position we want to measure angular
  • the other sensors used to indicate the number of complete revolutions of the shaft between a starting position and a final position, needing only sufficient precision to determine this number of revolutions, demanding precision which decreases with the reduction ratio used.
  • very economical structure sensors can be constructed, for example according to the principle of varying the coupling between a primary winding and secondary windings in phase quadrature, using a passive mobile member, sensors which are capable of providing output signals of the same format as that of inductive sensors of the resolver type which are significantly more expensive.
  • the addressing of the various sensors for the multiplexing is carried out in an extremely simple manner by means of coding at the supply voltage, not requiring as well as the two supply conductors for the transmission of the addressing command.
  • Different preferred embodiments of the present device are described in claims 2 to 6.
  • an input shaft 1 the absolute angular position of which is to be indicated, that is to say the position from a starting position, including the number of complete revolutions carried out between these positions, is coupled mechanically with a first position sensor C1 which is, in this case, by a resolver.
  • This sensor C1 is supplied by two conductors designated as a whole by MC1 and provides output signals on four conductors designated as a whole by SC1.
  • Fig. 1 shows, moreover, by way of nonlimiting example, three other sensors C2, C3 and C4 which could also be resolvers but which are preferably constituted by inductive sensors with a passive movable member supplying output signals same format as a resolver and therefore able to be processed by the same converter device.
  • the rotary members of these sensors C1 to C4, mounted on respective axes 2,3,4,5, are successively coupled, that is to say each with that of the previous sensor, by means of gears, for example d reduction gears such as 6.7 between C1 and C2, 8.9 between C2 and C3, and 10.11 between C3 and C4.
  • Their reduction ratio can be 16: 1, for example, which makes it possible to produce these gears in a very economical way compared to gears having, for example, ratios of 100: 1, as usually used in such a device.
  • the supply conductors of the sensors C2 to C4 and the conductors connecting their output terminals to a supply and multiplexing assembly 12 are designated, respectively, by MC2, MC3, MC4, and SC2, SC3, SC4, in a similar manner to those of sensor C1.
  • the power supply and multiplexing assembly 12 is installed near the sensors, for example on a machine such as an industrial robot, and it is connected to a signal processing device represented schematically by the blocks 13, 14, thus than to a multiplexing supply and control device represented by blocks 15, 16, 17.
  • a signal processing device represented schematically by the blocks 13, 14, thus than to a multiplexing supply and control device represented by blocks 15, 16, 17.
  • this connection is made, on the one hand, by four conductors S1, S2, S3, S4 and, on the other hand, by two conductors M1, M2, therefore by six conductors in total.
  • the signals appearing on conductors S1 to S4 are first processed in block 13, essentially constituted, in the illustrated case, by an analog-digital R / D converter, to transform analog signals of resolver format into digital signals, which will then be processed in an operating device 14 in order to determine the angular position of the input shaft and / or the speed of rotation of this shaft.
  • a supply current source for the sensors and the assembly 12 is indicated by block 15. It supplies, via two conductors R1, R2, a sinusoidal or pulse voltage to a coding circuit 16 connected by the conductors M1, M2 to set 12.
  • the selection of the sensors C1 to C4 for the transmission of the corresponding output signals, in multiplex, to the device 13, is carried out under the control of addressing signals supplied on conductors A1, A2, A3, A4, as indicated schematically FIG. 1, by a control device 17 also connected to the operating device 14.
  • Fig. 2 shows the diagram of the circuit 16 according to an exemplary embodiment, making it possible to superimpose on the supply voltage applied between R1 and R2 different offset voltages defined respectively by the level of DC voltages selectively applied to the conductors A1 to A4.
  • the superimposed DC voltages determined, for example, by the choice of resistors r1 to r6 in FIG. 2 preferably have a value substantially smaller than the supply voltage but must, of course, be sufficient to allow easy discrimination. It should also be noted that the potentials of M1 and M2 are floating.
  • Fig. 3 is a simplified diagram of a power supply and multiplexing assembly 12 used in the device of FIG. 1.
  • the voltage applied via conductors M1 and M2 is, on the one hand, rectified and filtered by circuits 18 to 21, in order to obtain a DC supply voltage Vcc, in particular for supplying analog multiplexers represented by a block 22.
  • the voltage on M1, M2 is, moreover, supplied to the various sensors via the conductors MC1 to MC4, a filtering being provided to eliminate the DC component by means of a high-pass filter 23 which, in the present example , can be mounted downstream of the power supply of the first sensor C1.
  • the voltage on M1, M2 is filtered by a low-pass filter 24 to apply the continuous offset voltage to a level discriminator 25 shown diagrammatically in FIG. 3.
  • This discriminator supplies to addressing inputs A 1 ′, A 2 ′, A 3 ′, A 4 ′ a corresponding addressing signal which causes the output signals of the respective sensor to appear on the transmission conductors S1 to S4 .
  • the detection of the DC offset voltage is preferably carried out in the interval between two consecutive pulses.
  • the multiplexing according to the invention practically does not complicate the overall structure of the present device, since it allows the use of a single analog-digital converter or other device for signal processing.
  • the use of a minimum of connection conductors, and, in particular in the case described by way of example, the possibility of using simple and more economical sensors, and gears with relatively low number of teeth, provides decisive technical and economic advantages.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)

Abstract

Two or more sensors (C1, C2, C3, C4) for one or more quantities to be measured are arranged so as to be connected (by MC1, MC2, MC3, MC4) to a source of electrical supply and to deliver, on output conductors (SC1, SC2, SC3, SC4), measurement signals. A supply and multiplexing assembly (12) is connected to these sensors and, moreover, on the one hand by means of a number of conductors (51, 52, 53, 54) at least approximately equal to that of the output conductors (SC1) of a single sensor (C1), to the processing device for the signals (13, 14) and, on the other hand to a supply and multiplexing control device (15, 16, 17).

Description

La présente invention concerne un dispositif de mesure comportant deux ou plusieurs capteurs pour une ou plusieurs grandeurs à mesurer, ces capteurs étant agencés pour être connectés à une source d'alimentation électrique et pour fournir, sur des conducteurs de sortie, des signaux fonction de la grandeur à mesurer, le dispositif comportant, en outre, des dispositifs de transmission et de traitement des signaux de sortie des capteurs.The present invention relates to a measuring device comprising two or more sensors for one or more quantities to be measured, these sensors being arranged to be connected to an electrical power source and to supply, on output conductors, signals depending on the quantity to be measured, the device further comprising devices for transmitting and processing the sensor output signals.

L'invention s'applique plus particulièrement à un dispositif d'indication de la position angulaire absolue d'un arbre, comportant des capteurs de position à organe rotatif, l'organe rotatif d'un premier capteur étant couplé mécaniquement avec ledit arbre, et les organes rotatifs du ou des autres capteurs étant couplés successivement avec celui du premier capteur par l'intermédiaire d'engrenages, ces capteurs étant agencés pour être alimentés par une tension sinusoïdale ou impulsionnelle, et pour fournir des signaux de sortie fonction de la position angulaire de leur organe rotatif.The invention applies more particularly to a device for indicating the absolute angular position of a shaft, comprising position sensors with a rotary member, the rotary member of a first sensor being mechanically coupled with said shaft, and the rotary members of the other sensor or sensors being successively coupled to that of the first sensor by means of gears, these sensors being arranged to be supplied by a sinusoidal or pulse voltage, and to provide output signals as a function of the angular position of their rotating organ.

Dans de tels dispositifs, les capteurs doivent être reliés, d'une part, à une source d'alimentation et, d'autre part, à un dispositif de traitement de leurs signaux de sortie. Dans le cas de l'utilisation de capteurs inductifs, par exemple du type résolver, ces signaux de sortie apparaissent aux bornes de deux phases et nécessitent donc jusqu'à quatre conducteurs par capteur pour leur transmission au dispositif de traitement situé généralement à une certaine distance des capteurs. Dans l'application à la mesure de la position angulaire d'un arbre, le nombre de capteurs utilisés dépend du domaine de travail du dispositif, c'est-à-dire du nombre maximal de révolutions de l'arbre d'entrée que le dispositif permet d'indiquer, de sorte qu'un grand nombre de conducteurs de liaison est souvent nécessaire, ce qui constitue dans la pratique un inconvénient important.In such devices, the sensors must be connected, on the one hand, to a power source and, on the other hand, to a device for processing their output signals. In the case of the use of inductive sensors, for example of the resolver type, these output signals appear at the terminals of two phases and therefore require up to four conductors per sensor for their transmission to the processing device generally located at a certain distance. sensors. In the application to the measurement of the angular position of a shaft, the number of sensors used depends on the working field of the device, i.e. the maximum number of revolutions of the input shaft that the device allows to indicate, so that a large number of connecting conductors is often necessary, which in practice is a significant drawback.

Pour limiter dans ce dernier cas particulier le nombre de conducteurs de liaison nécessaires, on peut utiliser entre les différents capteurs des engrenages à rapport de réduction élevé, de manière à réduire le nombre de capteurs nécessaires pour un domaine de travail donné. Toutefois, cette solution nécessite des capteurs et des engrenages de grande précision, et conduit donc à des prix de revient relativement élevés de l'ensemble du dispositif.To limit in the latter particular case the number of connecting conductors required, gears with high reduction ratio can be used between the various sensors, so as to reduce the number of sensors required for a given field of work. However, this solution requires very precise sensors and gears, and therefore leads to relatively high cost prices of the entire device.

L'invention vise à fournir un dispositif du type mentionné au début, dans lequel le nombre de conducteurs de liaison entre les capteurs et un dispositif de traitement des signaux et un dispositif d'alimentation peut être sensiblement réduit, tout en permettant de réduire également, dans certains cas de façon importante, le prix de revient de l'ensemble du dispositif.The invention aims to provide a device of the type mentioned at the start, in which the number of connecting conductors between the sensors and a signal processing device and a power supply device can be substantially reduced, while also making it possible to reduce, in some cases significantly, the cost price of the entire device.

A cet effet, le dispositif selon l'invention comporte un ensemble d'alimentation et de multiplexage connecté auxdits capteurs et relié, par ailleurs, d'une part au moyen d'un nombre de conducteurs au moins approximativement égal à celui desdits conducteurs de sortie d'un seul capteur, au dispositif de traitement des signaux et, d'autre part, à un dispositif d'alimentation et de commande de multiplexage.To this end, the device according to the invention comprises a supply and multiplexing assembly connected to said sensors and connected, moreover, on the one hand by means of a number of conductors at least approximately equal to that of said output conductors from a single sensor, to the signal processing device and, on the other hand, to a multiplexing supply and control device.

Le nombre des conducteurs de liaison devient ainsi indépendant du nombre de capteurs. Dans le cas particulier susmentionné du dispositif de mesure de la position angulaire d'un arbre au moyen de capteurs inductifs, le nombre des capteurs peut, par exemple, être augmenté de manière à permettre l'utilisation de rapports de réduction moins élevés, ou plus généralement de nombres de dents moins élevés, et donc d'engrenages nettement moins coûteux. D'autre part, seul le premier capteur, couplé directement à l'arbre d'entrée dont on veut mesurer la position angulaire, nécessite généralement, dans ce cas, une grande précision, c'est-à-dire celle souhaitée pour l'indication de la position angulaire sur un tour de l'arbre, les autres capteurs, servant à indiquer le nombre de révolutions complètes de l'arbre entre une position de départ et une position finale, n'ayant besoin que d'une précision suffisante pour déterminer ce nombre de révolutions, exigeance de précision qui diminue avec le rapport de réduction utilisé. Or, il s'avère que des capteurs de structure très économique peuvent être construits, par exemple selon le principe de la variation du couplage entre un enroulement primaire et des enroulements secondaires en quadrature de phase, en utilisant un organe mobile passif, capteurs qui sont capables de fournir des signaux de sortie de même format que celui des capteurs inductifs du type résolver sensiblement plus coûteux.The number of connecting conductors thus becomes independent of the number of sensors. In the above-mentioned particular case of the device for measuring the angular position of a shaft by means of inductive sensors, the number of sensors can, for example, be increased so as to allow the use of lower reduction ratios, or more generally fewer teeth, and therefore significantly less expensive gears. On the other hand, only the first sensor, directly coupled to the input shaft whose position we want to measure angular, generally requires, in this case, a high precision, that is to say that desired for the indication of the angular position on a revolution of the shaft, the other sensors, used to indicate the number of complete revolutions of the shaft between a starting position and a final position, needing only sufficient precision to determine this number of revolutions, demanding precision which decreases with the reduction ratio used. However, it turns out that very economical structure sensors can be constructed, for example according to the principle of varying the coupling between a primary winding and secondary windings in phase quadrature, using a passive mobile member, sensors which are capable of providing output signals of the same format as that of inductive sensors of the resolver type which are significantly more expensive.

Selon une forme d'exécution particulière du dispositif selon l'invention, l'adressage des différents capteurs pour le multiplexage est réalisé d'une façon extrêmement simple par l'intermédiaire d'un codage au niveau de la tension d'alimentation, ne nécessitant ainsi que les deux conducteurs d'alimentation pour la transmission de la commande d'adressage. Différentes formes de réalisation préférentielles du présent dispositif sont décrites dans les revendications 2 à 6.According to a particular embodiment of the device according to the invention, the addressing of the various sensors for the multiplexing is carried out in an extremely simple manner by means of coding at the supply voltage, not requiring as well as the two supply conductors for the transmission of the addressing command. Different preferred embodiments of the present device are described in claims 2 to 6.

Les buts, avantages et particularités du présent dispositif ressortiront, par ailleurs, plus clairement de la description suivante d'un exemple de réalisation, illustré dans le dessin annexé dans lequel

  • la Fig. 1 est un schéma d'ensemble d'un dispositif selon l'invention pour la mesure de la position angulaire d'un arbre,
  • la Fig. 2 est le schéma du dispositif d'alimentation et de commande de multiplexage faisant partie du dispositif de la Fig. 1, et
  • la Fig. 3 est le schéma de l'ensemble d'alimentation et de multiplexage faisant partie du dispositif de la Fig. 1.
The aims, advantages and particularities of this device will appear more clearly from the following description of an exemplary embodiment, illustrated in the accompanying drawing in which
  • Fig. 1 is an overall diagram of a device according to the invention for measuring the angular position of a shaft,
  • Fig. 2 is the diagram of the multiplexing supply and control device forming part of the device of FIG. 1, and
  • Fig. 3 is the diagram of the supply and multiplexing assembly forming part of the device of FIG. 1.

Selon la Fig. 1, un arbre d'entrée 1, dont on veut indiquer la position angulaire absolue, c'est-à-dire la position à partir d'une position de départ, y compris le nombre de révolutions complètes effectuées entre ces positions, est couplé mécaniquement avec un premier capteur de position C1 qui est constitué, en l'occurrence, par un résolver. Ce capteur C1 est alimenté par deux conducteurs désignés dans leur ensemble par MC1 et fournit des signaux de sortie sur quatre conducteurs désignés dans leur ensemble par SC1.According to FIG. 1, an input shaft 1, the absolute angular position of which is to be indicated, that is to say the position from a starting position, including the number of complete revolutions carried out between these positions, is coupled mechanically with a first position sensor C1 which is, in this case, by a resolver. This sensor C1 is supplied by two conductors designated as a whole by MC1 and provides output signals on four conductors designated as a whole by SC1.

La Fig. 1 montre, en outre, à titre d'exemple non-limitatif, trois autres capteurs C2, C3 et C4 qui pourraient également être des résolvers mais qui sont, de préférence, constitués par des capteurs inductifs à organe mobile passif fournissant des signaux de sortie de même format qu'un résolver et pouvant donc être traités par le même dispositif convertisseur. Les organes rotatifs de ces capteurs C1 à C4, montés sur des axes respectifs 2,3,4,5, sont couplés successivement, c'est-à-dire chacun avec celui du capteur précédent, au moyen d'engrenages, par exemple d'engrenages réducteurs tels que 6,7 entre C1 et C2, 8,9 entre C2 et C3, et 10,11 entre C3 et C4. Leur rapport de réduction peut être de 16:1, par exemple, ce qui permet de réaliser ces engrenages d'une façon très économique par rapport à des engrenages ayant, par exemple, des rapports de 100:1, tels qu'utilisés habituellement dans un tel dispositif. Dans le cas d'un couplage du type Master-Vernier entre capteurs, il est avantageux d'utiliser, de façon similaire, des nombres de dents inférieurs à ceux des dispositifs usuels de ce type, par example en réalisant des rapports Master-Vernier de 16:17.Fig. 1 shows, moreover, by way of nonlimiting example, three other sensors C2, C3 and C4 which could also be resolvers but which are preferably constituted by inductive sensors with a passive movable member supplying output signals same format as a resolver and therefore able to be processed by the same converter device. The rotary members of these sensors C1 to C4, mounted on respective axes 2,3,4,5, are successively coupled, that is to say each with that of the previous sensor, by means of gears, for example d reduction gears such as 6.7 between C1 and C2, 8.9 between C2 and C3, and 10.11 between C3 and C4. Their reduction ratio can be 16: 1, for example, which makes it possible to produce these gears in a very economical way compared to gears having, for example, ratios of 100: 1, as usually used in such a device. In the case of a coupling of the Master-Vernier type between sensors, it is advantageous to use, in a similar manner, numbers of teeth lower than those of the usual devices of this type, for example by producing Master-Vernier ratios of 4:17 p.m.

Les conducteurs d'alimentation des capteurs C2 à C4 et les conducteurs reliant leurs bornes de sortie à un ensemble d'alimentation et de multiplexage 12 sont désignés, respectivement, par MC2, MC3, MC4, et SC2, SC3, SC4, de façon similaire à ceux du capteur C1.The supply conductors of the sensors C2 to C4 and the conductors connecting their output terminals to a supply and multiplexing assembly 12 are designated, respectively, by MC2, MC3, MC4, and SC2, SC3, SC4, in a similar manner to those of sensor C1.

L'ensemble d'alimentation et de multiplexage 12 est installé à proximité des capteurs, par exemple sur une machine tel qu'un robot industriel, et il est relié à un dispositif de traitement des signaux représenté schématiquement par les blocs 13,14, ainsi qu'à un dispositif d'alimentation et de commande de multiplexage représenté par les blocs 15,16,17. Comme l'indique la Fig. 1, cette liaison est réalisée, d'une part, par quatre conducteurs S1, S2, S3, S4 et, d'autre part, par deux conducteurs M1, M2, donc par six conducteurs au total. Les signaux apparaissant sur les conducteurs S1 à S4 sont d'abord traités dans le bloc 13, essentiellement constitué, dans le cas illustré, par un convertisseur analogique-digital R/D, pour transformer les signaux analogiques de format résolver en signaux numériques, qui seront ensuite traités dans un dispositif d'exploitation 14 en vue de déterminer la position angulaire de l'arbre d'entrée et/ou la vitesse de rotation de cet arbre.The power supply and multiplexing assembly 12 is installed near the sensors, for example on a machine such as an industrial robot, and it is connected to a signal processing device represented schematically by the blocks 13, 14, thus than to a multiplexing supply and control device represented by blocks 15, 16, 17. As shown in Fig. 1, this connection is made, on the one hand, by four conductors S1, S2, S3, S4 and, on the other hand, by two conductors M1, M2, therefore by six conductors in total. The signals appearing on conductors S1 to S4 are first processed in block 13, essentially constituted, in the illustrated case, by an analog-digital R / D converter, to transform analog signals of resolver format into digital signals, which will then be processed in an operating device 14 in order to determine the angular position of the input shaft and / or the speed of rotation of this shaft.

Une source de courant d'alimentation pour les capteurs et l'ensemble 12 est indiquée par le bloc 15. Elle fournit, par l'intermédiaire de deux conducteurs R1, R2, une tension sinusoïdale ou impulsionnelle à un circuit de codage 16 relié par les conducteurs M1, M2 à l'ensemble 12.A supply current source for the sensors and the assembly 12 is indicated by block 15. It supplies, via two conductors R1, R2, a sinusoidal or pulse voltage to a coding circuit 16 connected by the conductors M1, M2 to set 12.

La sélection des capteurs C1 à C4 pour la transmission des signaux de sortie correspondants, en multiplex, au dispositif 13, s'effectue sous la commande de signaux d'adressage fournis sur des conducteurs A1, A2, A3, A4, comme l'indique schématiquement la Fig. 1, par un dispositif de commande 17 relié par ailleurs au dispositif d'exploitation 14.The selection of the sensors C1 to C4 for the transmission of the corresponding output signals, in multiplex, to the device 13, is carried out under the control of addressing signals supplied on conductors A1, A2, A3, A4, as indicated schematically FIG. 1, by a control device 17 also connected to the operating device 14.

La Fig. 2 montre le schéma du circuit 16 selon un exemple de réalisation, permettant de superposer à la tension d'alimention appliquée entre R1 et R2 différentes tensions de décalage définies respectivement par le niveau de tensions continues appliquées sélectivement aux conducteurs A1 à A4. Les tensions continues superposées déterminées, par exemple, par le choix des résistances r1 à r6 de la Fig. 2 ont, de préférence, une valeur sensiblement plus petite que la tension d'alimentation mais doivent, bien entendu, être suffisantes pour permettre une discrimination aisée. Il est à noter également que les potentiels de M1 et M2 sont flottants.Fig. 2 shows the diagram of the circuit 16 according to an exemplary embodiment, making it possible to superimpose on the supply voltage applied between R1 and R2 different offset voltages defined respectively by the level of DC voltages selectively applied to the conductors A1 to A4. The superimposed DC voltages determined, for example, by the choice of resistors r1 to r6 in FIG. 2 preferably have a value substantially smaller than the supply voltage but must, of course, be sufficient to allow easy discrimination. It should also be noted that the potentials of M1 and M2 are floating.

La Fig. 3 est un schéma simplifié d'un ensemble d'alimentation et de multiplexage 12 utilisé dans le dispositif de la Fig. 1. La tension appliquée par l'intermédiaire des conducteurs M1 et M2 est, d'une part, redressée et filtrée par des circuits 18 à 21, pour obtenir une tension d'alimentation continue Vcc, notamment pour alimenter des multiplexeurs analogiques représentés par un bloc 22.Fig. 3 is a simplified diagram of a power supply and multiplexing assembly 12 used in the device of FIG. 1. The voltage applied via conductors M1 and M2 is, on the one hand, rectified and filtered by circuits 18 to 21, in order to obtain a DC supply voltage Vcc, in particular for supplying analog multiplexers represented by a block 22.

La tension sur M1, M2 est, en outre, fournie aux différents capteurs par l'intermédiaire des conducteurs MC1 à MC4, un filtrage étant prévu pour éliminer la composante continue au moyen d'un filtre passe-haut 23 qui, dans le présent exemple, peut être monté en aval de l'alimentation du premier capteur C1.The voltage on M1, M2 is, moreover, supplied to the various sensors via the conductors MC1 to MC4, a filtering being provided to eliminate the DC component by means of a high-pass filter 23 which, in the present example , can be mounted downstream of the power supply of the first sensor C1.

Par ailleurs, la tension sur M1, M2 est filtrée par un filtre passe-bas 24 pour appliquer la tension de décalage continue à un discriminateur de niveaux 25 représenté schématiquement à la Fig. 3. Ce discriminateur fournit à des entrées d'adressage A 1′, A 2′, A 3′, A 4′ un signal d'adressage correspondant qui fait apparaître les signaux de sortie du capteur respectif sur les conducteurs de transmission S1 à S4.Furthermore, the voltage on M1, M2 is filtered by a low-pass filter 24 to apply the continuous offset voltage to a level discriminator 25 shown diagrammatically in FIG. 3. This discriminator supplies to addressing inputs A 1 ′, A 2 ′, A 3 ′, A 4 ′ a corresponding addressing signal which causes the output signals of the respective sensor to appear on the transmission conductors S1 to S4 .

Dans le cas d'une alimentation des capteurs par un courant impulsionnel, la détection de la tension continue de décalage s'effectue de préférence dans l'intervalle entre deux impulsions consécutives.In the case of a supply of the sensors by a pulse current, the detection of the DC offset voltage is preferably carried out in the interval between two consecutive pulses.

Il est à remarquer que, d'une façon générale, le multiplexage selon l'invention ne complique pratiquement pas la structure d'ensemble du présent dispositif, puisqu'il permet l'utilisation d'un seul convertisseur analogique-digital ou autre dispositif de traitement des signaux. En revanche, l'utilisation d'un minimum de conducteurs de liaison, et, notamment dans le cas décrit à titre d'exemple, la possibilité d'utiliser des capteurs simples et plus économiques, et des engrenages à nombre de dents relativement faible, procure des avantages techniques et économiques décisifs.It should be noted that, in general, the multiplexing according to the invention practically does not complicate the overall structure of the present device, since it allows the use of a single analog-digital converter or other device for signal processing. On the other hand, the use of a minimum of connection conductors, and, in particular in the case described by way of example, the possibility of using simple and more economical sensors, and gears with relatively low number of teeth, provides decisive technical and economic advantages.

Claims (7)

Dispositif de mesure comportant deux ou plusieurs capteurs (C1,C2,C3,C4) pour une ou plusieurs grandeurs à mesurer, ces capteurs étant agencés pour être connectés (par MC1,MC2,MC3,MC4) à une source d'alimentation électrique et pour fournir, sur des conducteurs de sortie (SC1,SC2,SC3,SC4), des signaux fonction de la grandeur à mesurer, le dispositif comportant, en outre, des moyens (12,13,14) pour la transmission et le traitement des signaux de sortie des capteurs, caractérisé en ce qu'il comporte un ensemble d'alimentation et de multiplexage (12) connecté auxdits capteurs et relié, par ailleurs, d'une part au moyen d'un nombre de conducteurs (51,52,53,54) au moins approximativement égal à celui desdits conducteurs de sortie (SC1) d'un seul capteur (C1), au dispositif de traitement des signaux (13,14) et, d'autre part, à un dispositif d'alimentation et de commande de multiplexage (15,16,17).Measuring device comprising two or more sensors (C1, C2, C3, C4) for one or more quantities to be measured, these sensors being arranged to be connected (by MC1, MC2, MC3, MC4) to a power supply source and to supply, on output conductors (SC1, SC2, SC3, SC4), signals depending on the quantity to be measured, the device further comprising means (12,13,14) for the transmission and processing of sensor output signals, characterized in that it comprises a supply and multiplexing assembly (12) connected to said sensors and connected, moreover, on the one hand by means of a number of conductors (51, 52, 53,54) at least approximately equal to that of said output conductors (SC1) of a single sensor (C1), to the signal processing device (13,14) and, on the other hand, to a supply device and multiplexing control (15,16,17). Dispositif selon la revendication 1, caractérisé en ce que le dispositif d'alimentation et de commande de multiplexage (15,16,17) comporte des moyens (16) pour superposer à la tension d'alimentation à fournir aux capteurs un signal de commande de multiplexage ou pour moduler ladite tension d'alimentation par un tel signal, et en ce que l'ensemble d'alimentation et de multiplexage (12) comporte des moyens de discrimination (24,25) dudit signal de commande.Device according to Claim 1, characterized in that the multiplexing supply and control device (15, 16, 17) comprises means (16) for superimposing on the supply voltage to supply the sensors with a signal for controlling the multiplexing or for modulating said supply voltage by such a signal, and in that the supply and multiplexing assembly (12) comprises means (24,25) for discriminating said control signal. Dispositif selon la revendication 1 pour l'indication de la position angulaire absolue d'un arbre (1), comportant des capteurs de position à organe rotatif, l'organe rotatif d'un premier capteur étant couplé mécaniquement avec ledit arbre, et les organes rotatifs du ou des autres capteurs étant couplés successivement avec celui du premier capteur au moyen d'un couplage mécanique (6-11) ayant un rapport de transmission déterminé, ces capteurs étant agencés pour être alimentés par une tension périodique symétrique ou impulsionnelle, et pour fournir des signaux de sortie fonction de la position angulaire de leur organe rotatif, caractérisé en ce que ledit dispositif d'alimentation et de commande du multiplexage (15,16,17) comporte des moyens pour superposer à la tension d'alimentation à fournir aux capteurs, une tension de décalage continue, selectionnée parmi au moins autant de tensions de décalage de valeurs et/ou de polarités différentes que le dispositif comporte de capteurs au-delà du premier, chacune de ces tensions de décalage correspondant à un certain capteur ou une partie d'un certain capteur, et en ce que l'ensemble d'alimentation et de multiplexage comporte des moyens de discrimination (24,25) pour déterminer la valeur et/ou la polarité de la tension de décalage appliquée, ainsi que des moyens (22) pour adresser le capteur ou la partie de capteur correspondants de façon que les signaux de sortie de ce capteur ou de cette partie de capteurs soient transmis au dispositif de traitement des signaux (13,14).Device according to claim 1 for indicating the absolute angular position of a shaft (1), comprising position sensors with a rotary member, the rotary member of a first sensor being mechanically coupled with said shaft, and the members of the other sensor (s) being successively coupled to that of the first sensor by means of a mechanical coupling (6-11) having a ratio of determined transmission, these sensors being arranged to be supplied by a symmetrical or impulse periodic voltage, and to supply output signals as a function of the angular position of their rotary member, characterized in that said supply and multiplexing control device ( 15,16,17) comprises means for superimposing on the supply voltage to be supplied to the sensors, a continuous offset voltage, selected from at least as many offset voltages of different values and / or polarities as the device comprises sensors beyond the first, each of these offset voltages corresponding to a certain sensor or part of a certain sensor, and in that the power supply and multiplexing assembly includes discrimination means (24,25) for determining the value and / or polarity of the applied offset voltage, as well as means (22) for addressing the corresponding sensor or sensor part undulating so that the output signals from this sensor or part of these sensors are transmitted to the signal processing device (13,14). Dispositif selon la revendication 3, dans lequel les capteurs sont alimentés par un courant impulsionnel, caractérisé en ce que l'ensemble d'alimentation et de multiplexage comporte des moyens de discrimination agencés pour déterminer la valeur et/ou la polarité de la tension de décalage, à un instant du cycle d'alimentation se situant dans l'intervalle entre deux impulsions successives.Device according to claim 3, in which the sensors are supplied by a pulse current, characterized in that the supply and multiplexing assembly comprises discrimination means arranged to determine the value and / or the polarity of the offset voltage , at an instant in the supply cycle lying in the interval between two successive pulses. Dispositif selon la revendications 3, caractérisé en ce que le premier capteur (C1) est un capteur d'une précision sensiblement plus grande que celle des autres capteurs du dispositif.Device according to claim 3, characterized in that the first sensor (C1) is a sensor with a precision substantially greater than that of the other sensors of the device. Dispositif selon la revendication 5, caractérisé en ce que le premier capteur (C1) est constitué par un résolver, les autres capteurs étant du type inductif à organe rotatif passif, agencés pour fournir des signaux de sortie de même format que le résolver.Device according to claim 5, characterized in that the first sensor (C1) consists of a resolver, the other sensors being of the inductive type with a rotating member passive, arranged to provide output signals of the same format as the resolver. Dispositif selon l'une des revendications 3 à 6, caractérisé en ce que ledit couplage mécanique entre les différents capteurs est constitué par des engrenages (6-11).Device according to one of Claims 3 to 6, characterized in that the said mechanical coupling between the various sensors is constituted by gears (6-11).
EP90810943A 1989-12-06 1990-12-04 Multiplex measuring device with a plurality of sensors Expired - Lifetime EP0432101B1 (en)

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CH681655A5 (en) 1993-04-30
DE69017607T2 (en) 1995-12-07
US5211063A (en) 1993-05-18
PL288080A1 (en) 1991-12-02
JPH03225217A (en) 1991-10-04
DE69017607D1 (en) 1995-04-13
EP0432101B1 (en) 1995-03-08
CS603790A3 (en) 1992-08-12

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