WO1993024877A1 - System for the control of heating equipment divided into several heating areas and used in the manufacture of composite material products - Google Patents

System for the control of heating equipment divided into several heating areas and used in the manufacture of composite material products Download PDF

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Publication number
WO1993024877A1
WO1993024877A1 PCT/FR1993/000507 FR9300507W WO9324877A1 WO 1993024877 A1 WO1993024877 A1 WO 1993024877A1 FR 9300507 W FR9300507 W FR 9300507W WO 9324877 A1 WO9324877 A1 WO 9324877A1
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WO
WIPO (PCT)
Prior art keywords
computer
temperature sensor
heating
digital value
detection
Prior art date
Application number
PCT/FR1993/000507
Other languages
French (fr)
Inventor
Gérard GUILLEMOT
Original Assignee
Guillemot Gerard
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 Guillemot Gerard filed Critical Guillemot Gerard
Publication of WO1993024877A1 publication Critical patent/WO1993024877A1/en

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1917—Control of temperature characterised by the use of electric means using digital means
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1927—Control of temperature characterised by the use of electric means using a plurality of sensors
    • G05D23/193—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces
    • G05D23/1932—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces to control the temperature of a plurality of spaces
    • G05D23/1934—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces to control the temperature of a plurality of spaces each space being provided with one sensor acting on one or more control means
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/22—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element being a thermocouple

Definitions

  • the present invention relates to a system for regulating high temperature electrical heating equipment mounted on a press intended for the manufacture of plastic or composite material products, said heating equipment being distributed in several heating zones each equipped with a heating element.
  • heating and a temperature sensor having two terminals subjected to an electric voltage, the heating elements being electrically supplied independently by means of electronic power supply means, said regulation system comprising a computer intended to regulate the electronic power supply means as a function of predetermined set points per heating zone and as a function of the indications provided by said temperature sensors.
  • the international application published under No. WO 90/1173 relates to heating elements multizoncs, wherein each heating zone is equipped with a thcrmocouple connected to a calculator for piloting the electronic power supply means according to the points of setpoint for each heating zone. Thermocouples and heating elements can naturally be incorporated in the tools or molds for the production of parts or in the heating elements themselves.
  • thermocouples are of good quality.
  • these indications can be disturbed by external parasites resulting in particular from high-intensity currents which supply the heating elements. These parasites are all the more important since in general one of the terminals of the thermocouples is connected to ground, and the temperature indication is noted on the second terminal of the thermocouple.
  • the computer is located at a sufficient distance from the heating elements and the connecting cables connecting the thermocouples to the computer have a long length, which results in additional noise and inevitable current leaks.
  • the connecting cables connecting the thermocouples to the computer have a long length, which results in additional noise and inevitable current leaks.
  • the purpose of the present invention is to propose a significant improvement in the above-mentioned regulation system, and to ensure that the temperature indications received by the computer are of better quality. And that the cooking can continue in good conditions in the event of a failure of a temperature measurement sensor.
  • the proposed regulation system is characterized in that it further comprises means for transforming the voltages detected at the two terminals of any one of said temperature sensors chosen by said computer in an established sequence, in a digital value representative of the temperature of the heating zone associated with said temperature sensor, said digital value being transmitted to said computer for the purpose of regulating the electronic supply means, the means for detecting the state of good or malfunction of said chosen temperature sensor, and means for determining a replacement digital value in the event of detection of a state of malfunction by said detection means.
  • the means for transforming voltages into numerical values are preferably located near the press. This makes it possible to reduce the length of the voltage transmission wires and thereby the influence of parasites.
  • the cables for transmitting the digital value representative of the temperature can be very long, since it is known that digital digital signals are less sensitive to interference.
  • each temperature sensor transmitting the voltages from its two terminals to said transformation means the voltage variations due to external parasites can be compensated.
  • the means for transforming the voltages read into a digital value include ⁇ : a multiplexer connected to said computer by wiring used for addressing a temperature sensor and connected to each of said measurement sensors by two electric wires, said multiplexer providing output the two voltages recorded at the two terminals of the temperature sensor chosen by said computer, an operational amplifier connected to said multiplexer to receive said two voltages and providing a differential voltage as output, means for linearizing said differential voltage, and an analog-to-digital converter connected to said computer and intended to transform the differential voltage supplied by said linearization means into a numerical value representative of the measured temperature.
  • the means for detecting the state of good or bad functioning of the chosen temperature sensor are interposed between said operational amplifier and said computer and supply to said computer a fault signal when the differential voltage is zero.
  • the transformation means and the detection means are preferably mounted on a single electronic plate.
  • the means for determining the replacement digital value in the event of detection of a poor operating condition of the chosen temperature sensor are provided in said computer.
  • the means for determining the replacement digital value in the event of detection of a malfunction state of the chosen temperature sensor comprise a microcontroller connected to said detection means to said converter and to said computer.
  • Said ⁇ r Ocontroller is further connected to said computer by said wiring serving for the addressing of a temperature sensor and comprises a memory for storing the operating state of each temperature sensor.
  • the system further comprises means for detecting an overheating of the heating zone associated with the chosen temperature sensor, said means being interposed between said linearization means and said computer and providing said computer with an overheating signal when the differential voltage is greater than a predetermined maximum voltage.
  • the computer then comprises means for cutting off the electrical supply to the heating elements in the event of reception of the overheating signal.
  • FIG. 1 shows a diagram general of a press equipped with two multi-zone heating elements and the regulation system of the present invention
  • Figure 2 shows the block diagram of the regulatory system of the present invention.
  • FIG. 1 there is shown by reference 1, a first electrically heating element of a press for the implementation of products made of composite materials and by reference 2, a second heating element of the same press not shown. Said heating elements 1 and 2 are mounted on the fixed frame or the table of said press.
  • heating elements 1, 2 are divided into several heating zones, referenced 3, each heating zone 3 is equipped with a heating element 4 and a temperature sensor 5.
  • the heating elements 4 are electrically powered independent via electronic power supply means 6.
  • These electronic power supply means 6 are regulated by a computer 7 as a function of instructions determined by the computer 7 and by heating zone 3, as a function of the temperature indications provided by the temperature sensors 5 associated with each heating zone. 3.
  • the electronic power means 6 are connected to the electrical network by a terminal block 8 and comprising, in known manner, either solid state relays, power triacs or thyristors controlled in the train of waves by external instructions delivered by the computer 7.
  • an electronic card 9 is interposed between the temperature sensors 5 and the computer 7. This electronic card 9 constitutes, with the computer 7, the system for regulating the heating equipment 1 and 2.
  • This electronic card 9 is shown in detail in FIG. 2. It essentially comprises a multiplexer 10 which is connected to the computer 7 by wiring 10a, and to each of the temperature sensors 5 by two electric wires 11, 12 respectively connected to the two terminals 13, 14 of the corresponding temperature sensor 5.
  • the temperature sensor 5 preferably consists of a thermocouple which delivers on its two terminals 13, 14 voltages whose difference is a function of the temperature to which the thermocouple is subjected.
  • the multiplexer 10 has two output terminals 15 and 16 to which the voltages A and B supplied by the temperature sensor 5 will be applied, which is chosen as a function of an address transmitted on the wiring 10a by the computer 7.
  • the voltages A and B supplied by the multiplexer 10 are applied to the input terminals of an operational amplifier 17 which outputs a voltage equal to the difference of the voltages A and B.
  • This differential voltage AB is then adjusted by means of linearization 18 and a cold junction compensation device 19 and finally it is transformed into a digital value V, representative of the temperature recorded in the heating zone 3 associated with the chosen temperature sensor 5, by an analog digital converter 20.
  • the value digital V is transmitted to the computer 7 by a wiring21 connecting the converter 20 to the computer 7.
  • This digital value N is used by the computer 7 to regulate the electronic power supply means 6 for the heating element 4 associated with the temperature 5 previously chosen by the computer 7.
  • the electronic plate 9 further comprises means 22 for detecting a zero differential voltage at the output of the operational amplifier 17, that is to say a state of non-operation or failure of the temperature sensor 5 chosen.
  • These means 22 are connected, on the one hand, to the output of the operational amplifier 17 and, on the other hand, to the computer 7, which allows the latter to know the non-functioning state of the temperature 5 chosen.
  • the electronic plate 9 finally comprises means 23 for detecting at the output of the compensation device 19 a differential voltage greater than a predetermined maximum voltage, that is to say a state of overheating of the corresponding heating zone 3. These means 23 are connected, on the one hand, to the output of the compensation device 19 and, on the other hand, to the computer 7 in order to transmit an overheating signal to it when the differential voltage is greater than the predetermined maximum voltage.
  • the computer 7 includes means for cutting off the electrical supply to the heating elements 4 in the event of reception of the overheating signal.
  • the computer 7 comprises, according to a first alternative embodiment, means for determining a digital value of probable temperature, replacing the digital value supplied by the converter analog digital 20, which is transmitted to the electronic power supply means 6 in order to determine the intensity of the current supplying the heating element 4 associated with the faulty temperature sensor 5.
  • this replacement digital value is determined by a microcontroller 24 mounted on the electronic plate 9, which makes it possible to discharge the computer 7.
  • This microcontroller 24 is connected to the detection means 22, to the addressing wiring 10a to the analog digital converter 20 and to the computer 7.
  • the microcontroller 24 is also connected to the means 23 for detecting the overheating state of a heating zone 3, which enables it to store this information in the storage memory 25.
  • the electronic plate 9 can be placed in the vicinity of the heating elements 1 and 2. It includes means for transforming the voltages detected at the two terminals 11, 12 of any of the temperature sensors 5 chosen by the computer. 7 according to a preset sequence, in a digital value representative of the temperature of the heating zone 3 associated with the chosen temperature sensor, as well as the means 22 for detecting the non-operating state of the chosen temperature sensor.
  • the electronic plate 9 transmits a replacement digital value to the computer 7 in the event of failure of the chosen temperature sensor. The latter receives at the same time a non-operating signal which makes it possible to output a message on the operator console of the computer 7.
  • the information stored in the memory 25 can be further processed by preset programs in order to know the state of the areas of heater 3, heater elements 4 and temperature sensors 5 during maintenance.
  • the digital value N representative of the temperature recorded and supplied by the analog converter 20 is transmitted to the microcontroller 24 by the wiring 21.
  • the microcontroller 24 then transmits this value V or the replacement value by the wiring 21a.

Abstract

System for the control of heating equipment (1, 2) divided into several heating areas, each heating area (3) including a heating element (13) and a temperature sensor (5). The system comprises a computer (7) connected to the temperature sensors (5) by an electronic board (9) comprising means (10, 17, 18, 19) for converting voltages across the terminals of the sensor selected (5) by the computer (7) into a digital value (V) corresponding to the temperature of the heating area (3) and transmitted to the computer (7). The system also includes means (22) for detecting correct or defective poor operation of the sensor (5) and means (24, 26) for determining a digital replacement value in the event of failure of the selected sensor (5).

Description

Système de régulation des équipements chauffants par zones régulées pour la mise en oeuyre de produits en matériaux composites Regulation system of heating equipment by regulated zones for the use of products made of composite materials
La présente invention concerne un système de régulation d'équipements chauffants électriques à hautes températures montés sur une presse destinée à la fabrication de produits en matière plastique ou matériaux composites, lesdits équipements chauffants étant répartis en plusieurs zones de chauffe équipés chacun d'un élément de chauffe et d'un capteur de température ayant deux bornes soumises à une tension électrique, les éléments de chauffe étant alimentés électriquement de façon indépendante par l'intermédiaire de moyens électroniques d'alimention en puissance, ledit système de régulation comportant un calculateur destiné à réguler les moyens électroniques d'alimentation en puissance en fonction de consignes prédéterminées par zone de chauffe et en fonction des indications fournies par lesdits capteurs de température. La demande internationale publiée sous le n* WO 90/1173 concerne des éléments chauffants multizoncs, dans lesquels chaque zone de chauffe est équipée d'un thcrmocouple relié à un calculateur destiné au pilotage des moyens électroniques d'alimentation en puissance en fonction des points de consigne de chaque zone de chauffe. Les thermocouples et les éléments de chauffe peuvent naturellement être incorporés dans les outillages ou moules de production de pièces ou dans les éléments chauffants proprement dits.The present invention relates to a system for regulating high temperature electrical heating equipment mounted on a press intended for the manufacture of plastic or composite material products, said heating equipment being distributed in several heating zones each equipped with a heating element. heating and a temperature sensor having two terminals subjected to an electric voltage, the heating elements being electrically supplied independently by means of electronic power supply means, said regulation system comprising a computer intended to regulate the electronic power supply means as a function of predetermined set points per heating zone and as a function of the indications provided by said temperature sensors. The international application published under No. WO 90/1173 relates to heating elements multizoncs, wherein each heating zone is equipped with a thcrmocouple connected to a calculator for piloting the electronic power supply means according to the points of setpoint for each heating zone. Thermocouples and heating elements can naturally be incorporated in the tools or molds for the production of parts or in the heating elements themselves.
La production des pièces en matériaux composites exige un suivi rigoureux des courbes de montée en température et des paliers de température. Cette qualité ne peut être obtenue que si les indications de température fournies au calculateur par les thermocouples sont de bonnes qualités. Or, ces indications peuvent être perturbées par des parasites extérieurs résultant notamment des courants à haute intensité qui alimentent les éléments de chauffe. Ces parasites sont d'autant plus importants qu'en général on relie l'une des bornes des thermocouples à la masse, et que l'indication de température est relevée sur la deuxième borne du thermocouple.The production of composite material parts requires rigorous monitoring of the temperature rise curves and temperature steps. This quality can only be obtained if the temperature indications supplied to the computer by the thermocouples are of good quality. However, these indications can be disturbed by external parasites resulting in particular from high-intensity currents which supply the heating elements. These parasites are all the more important since in general one of the terminals of the thermocouples is connected to ground, and the temperature indication is noted on the second terminal of the thermocouple.
De plus, le calculateur est situé à une distance suffisante des éléments de chauffe et les câbles de liaison reliant les thermocouples au calculateur ont une grande longueur, ce qui se traduit par des parasites supplémentaires et des fuites de courant inévitables. Enfin, en cas de panne d'un thcrmocouple, les systèmes de régulation actuels entrainent naturellement une surchauffe de la zone de chauffe associée. On y remédie en provoquant un arrêt total de l'alimentation électrique des éléments de chauffe, ce qui entraine une perte de production.In addition, the computer is located at a sufficient distance from the heating elements and the connecting cables connecting the thermocouples to the computer have a long length, which results in additional noise and inevitable current leaks. Finally, in the event of a thcrmocouple failure, current regulation systems naturally lead to overheating of the associated heating zone. We remedies this by causing a total shutdown of the electrical supply to the heating elements, which leads to a loss of production.
Le but de la présente invention est de proposer une amélioration notable dans le système de régulation mentionné ci-dessus, et de faire en sorte que les indications de température reçues par le calculateur soient de meilleure qualité.et que la cuisson puisse se poursuivre dans de bonnes conditions en cas de panne éventuelle d'un capteur de mesure de température.The purpose of the present invention is to propose a significant improvement in the above-mentioned regulation system, and to ensure that the temperature indications received by the computer are of better quality. And that the cooking can continue in good conditions in the event of a failure of a temperature measurement sensor.
Le but est atteint selon l'invention par le fait que le système de régulation proposé est caractérisé en ce qu'il comporte, en outre, des moyens pour transformer les tensions relevées aux deux bornes de l'un quelconque desdits capteurs de température choisi par ledit calculateur selon une séquence établie, en une valeur numérique représentative de la température de la zone de chauffe associée audit capteur de température, ladite valeur numérique étant transmise audit calculateur en vue de la régulation des moyens électroniques d'alimentation, des moyens de détection de l'état de bon ou mauvais fonctionnement dudit capteur de température choisi, et des moyens pour déterminer une valeur numérique de remplacement en cas de détection d'un état de mauvais fonctionnement par lesdits moyens de détection.The object is achieved according to the invention by the fact that the proposed regulation system is characterized in that it further comprises means for transforming the voltages detected at the two terminals of any one of said temperature sensors chosen by said computer in an established sequence, in a digital value representative of the temperature of the heating zone associated with said temperature sensor, said digital value being transmitted to said computer for the purpose of regulating the electronic supply means, the means for detecting the state of good or malfunction of said chosen temperature sensor, and means for determining a replacement digital value in the event of detection of a state of malfunction by said detection means.
Les moyens de transformation des tensions en valeur numérique sont de préférence situés près de la presse. Ceci permet de diminuer la longueur des fils de transmission des tensions et par le fait même l'influence des parasites. En revanche, les câbles de transmission de la valeur numérique représentative de la température peuvent être de grande longueur, car il est connu que les signaux numériques digitaux sont moins sensibles aux parasites. Enfin, chaque capteur de température transmettant les tensions de ses deux bornes auxdits moyens de transformation, les variations de tension dues aux parasites extérieurs peuvent être compensées. Les moyens pour transformer les tensions relevées en une valeur numérique comporter^ : un multiplexeur relié audit calculateur par un câblage servant à l'adressage d'un capteur de température et relié à chacun desdits capteurs de mesure par deux fils électriques, ledit multiplexeur fournissant en sortie les deux tensions relevées aux deux bornes du capteur de température choisi par ledit calculateur, un amplificateur opérationnel relié audit multiplexeur pour recevoir lesdites deux tensions et fournissant en sortie une tension différentielle, un moyen pour linéariser ladite tension différentielle, et un convertisseur analogique numérique relié audit calculateur et destiné à transformer la tension différentielle fournie par ledit moyen de linéarisation en une valeur numérique représentative de la température mesurée.The means for transforming voltages into numerical values are preferably located near the press. This makes it possible to reduce the length of the voltage transmission wires and thereby the influence of parasites. On the other hand, the cables for transmitting the digital value representative of the temperature can be very long, since it is known that digital digital signals are less sensitive to interference. Finally, each temperature sensor transmitting the voltages from its two terminals to said transformation means, the voltage variations due to external parasites can be compensated. The means for transforming the voltages read into a digital value include ^: a multiplexer connected to said computer by wiring used for addressing a temperature sensor and connected to each of said measurement sensors by two electric wires, said multiplexer providing output the two voltages recorded at the two terminals of the temperature sensor chosen by said computer, an operational amplifier connected to said multiplexer to receive said two voltages and providing a differential voltage as output, means for linearizing said differential voltage, and an analog-to-digital converter connected to said computer and intended to transform the differential voltage supplied by said linearization means into a numerical value representative of the measured temperature.
Les moyens de détection de l'état de bon ou mauvais fonctionnement du capteur de température choisi sont interposés entre ledit amplificateur opérationnel et ledit calculateur et fournissent audit calculateur un signal de panne lorsque la tension différentielle est nulle. les moyens de transformation et les moyens de détection sont de préférence montés sur une seule plaque électronique.The means for detecting the state of good or bad functioning of the chosen temperature sensor are interposed between said operational amplifier and said computer and supply to said computer a fault signal when the differential voltage is zero. the transformation means and the detection means are preferably mounted on a single electronic plate.
Selon un premier mode de réalisation, les moyens pour déterminer la valeur numérique de remplacement en cas de détection d'un mauvais état de fonctionnement du capteur de température choisi sont prévus dans ledit calculateur.According to a first embodiment, the means for determining the replacement digital value in the event of detection of a poor operating condition of the chosen temperature sensor are provided in said computer.
Selon un mode de réalisation préféré, les moyens pour déterminer la valeur numérique de remplacement en cas de détection d'un état de mauvais fonctionnement du capteur de température choisi comportent un microcontrôleur relié auxdits moyens de détection audit convertisseur et audit calculateur.According to a preferred embodiment, the means for determining the replacement digital value in the event of detection of a malfunction state of the chosen temperature sensor comprise a microcontroller connected to said detection means to said converter and to said computer.
Ledit πr Ocontrôleur est de plus relié audit calculateur par ledit câblage servant à l'aαressage d'un capteur de température et comporte une mémoire de stockage de l'état de fonctionnement de chaque capteur de température.Said πr Ocontroller is further connected to said computer by said wiring serving for the addressing of a temperature sensor and comprises a memory for storing the operating state of each temperature sensor.
De préférence, le système comporte de plus des moyens pour détecter une surchauffe de la zone de chauffe associée au capteur de température choisi, lesdits moyens étant interposés entre ledit moyen de linéarisation et ledit calculateur et fournissant audit calculateur un signal de surchauffe lorsque la tension différentielle est supérieure à une tension maximale prédéterminée.Preferably, the system further comprises means for detecting an overheating of the heating zone associated with the chosen temperature sensor, said means being interposed between said linearization means and said computer and providing said computer with an overheating signal when the differential voltage is greater than a predetermined maximum voltage.
Le calculateur comporte alors des moyens pour couper l'alimentation électrique des éléments de chauffe en cas de réception du signal de surchauffe.The computer then comprises means for cutting off the electrical supply to the heating elements in the event of reception of the overheating signal.
D'autres avantages et caractéristiques de '"''nvention ressortiront à la lecture de la description suivante d'un mode de réa. sation préféré fait à titre d'exemple et en référence au dessin annexé dans lequel : la figure 1 représente un schéma général d'une presse équipée de deux éléments chauffants multizones et du système de régulation de la présente invention, la figure 2 montre le schéma de principe du système de régulation de la présente invention.Other advantages and characteristics of " '' nvention will become apparent on reading the following description of a preferred mode sheave sation made by way of example and with reference to the accompanying drawings wherein:. 1 shows a diagram general of a press equipped with two multi-zone heating elements and the regulation system of the present invention, Figure 2 shows the block diagram of the regulatory system of the present invention.
Sur la figure 1 on a représenté par la référence 1, un premier élément chauffant électriquement d'une presse pour la mise en oeuvre de produits en matériaux composites et par la référence 2, un deuxième élément chauffant de la même presse non représentée. Lesdits éléments chauffants 1 et 2 sont montés sur le bâti fixe ou la table de ladite presse.In Figure 1 there is shown by reference 1, a first electrically heating element of a press for the implementation of products made of composite materials and by reference 2, a second heating element of the same press not shown. Said heating elements 1 and 2 are mounted on the fixed frame or the table of said press.
Ces éléments chauffants 1, 2 sont répartis en plusieurs zones de chauffe, référencés 3, chaque zone de chauffe 3 est équipée d'un élément de chauffe 4 et d'un capteur de température 5. Les éléments de chauffe 4 sont alimentés électriquement de façon indépendante par l'intermédiaire de moyens électroniques d'alimentation en puissance 6.These heating elements 1, 2 are divided into several heating zones, referenced 3, each heating zone 3 is equipped with a heating element 4 and a temperature sensor 5. The heating elements 4 are electrically powered independent via electronic power supply means 6.
Ces moyens électroniques d'alimentation en puissance 6 sont régulés par un calculateur 7 en fonction de consignes déterminées par le calculateur 7 et par zone de chauffe 3, en fonction des indications de température fournies par les capteurs de température 5 associés à chaque zone de chauffe 3.These electronic power supply means 6 are regulated by a computer 7 as a function of instructions determined by the computer 7 and by heating zone 3, as a function of the temperature indications provided by the temperature sensors 5 associated with each heating zone. 3.
Les moyens électroniques de puissance 6 sont reliés au réseau électrique par un bornier 8 et comportant, de manière connue, soit des relais statiques, des triacs de puissance ou de thyristors pilotés en train d'ondes par des consignes extérieures délivrées par le calculateur 7. une carte électronique 9 est interposée entre les capteurs de température 5 et le calculateur 7. Cette carte électronique 9 constitue avec le calculateur 7 le système de régulation des équipements chauffants 1 et 2.The electronic power means 6 are connected to the electrical network by a terminal block 8 and comprising, in known manner, either solid state relays, power triacs or thyristors controlled in the train of waves by external instructions delivered by the computer 7. an electronic card 9 is interposed between the temperature sensors 5 and the computer 7. This electronic card 9 constitutes, with the computer 7, the system for regulating the heating equipment 1 and 2.
Cette carte électronique 9 est représentée en détail sur la figure 2. Elle comporte essentiellement un multiplexeur 10 qui est relié au calculateur 7 par un câblage 10a, et à chacun des capteurs de température 5 par deux fils électriques 11, 12 reliés respectivement aux deux bornes 13, 14 du capteur de température 5 correspondant.This electronic card 9 is shown in detail in FIG. 2. It essentially comprises a multiplexer 10 which is connected to the computer 7 by wiring 10a, and to each of the temperature sensors 5 by two electric wires 11, 12 respectively connected to the two terminals 13, 14 of the corresponding temperature sensor 5.
Le capteur de température 5 est de préférence constitué d'un thermocouple qui délivre sur ses deux bornes 13, 14 des tensions dont la différence est fonction de la température à laquelle le thermocouple est soumis.The temperature sensor 5 preferably consists of a thermocouple which delivers on its two terminals 13, 14 voltages whose difference is a function of the temperature to which the thermocouple is subjected.
Le multiplexeur 10 comporte deux bornes de sortie 15 et 16 auxquelles seront appliquées les tensions A et B fournies par le capteur de température 5 lequel est choisi en fonction d'une adresse transmise sur le câblage 10a par le calculateur 7. Les tensions A et B fournies par le multiplexeur 10 sont appliquées aux bornes d'entrée d'un amplificateur opérationnel 17 qui émet en sortie une tension égale à la différence des tensions A et B. Cette tension différentielle A-B est ensuite ajustée par un moyen de linéarisation 18 et un dispositif de compensation 19 de soudure froide et enfin elle est transformée en une valeur numérique V, représentative de la température relevée dans la zone de chauffe 3 associée au capteur de température choisi 5, par un convertisseur analogique numérique 20. La valeur numérique V est transmise au calculateur 7 par un câblage21 reliant le convertisseur 20 au calculateur 7. Cette valeur numérique N est utilisée par le calculateur 7 pour réguler les moyens électroniques d'alimentation en puissance 6 pour l'élément de chauffe 4 associé au capteur de température 5 précédemment choisi par le calculateur 7.The multiplexer 10 has two output terminals 15 and 16 to which the voltages A and B supplied by the temperature sensor 5 will be applied, which is chosen as a function of an address transmitted on the wiring 10a by the computer 7. The voltages A and B supplied by the multiplexer 10 are applied to the input terminals of an operational amplifier 17 which outputs a voltage equal to the difference of the voltages A and B. This differential voltage AB is then adjusted by means of linearization 18 and a cold junction compensation device 19 and finally it is transformed into a digital value V, representative of the temperature recorded in the heating zone 3 associated with the chosen temperature sensor 5, by an analog digital converter 20. The value digital V is transmitted to the computer 7 by a wiring21 connecting the converter 20 to the computer 7. This digital value N is used by the computer 7 to regulate the electronic power supply means 6 for the heating element 4 associated with the temperature 5 previously chosen by the computer 7.
La plaque électronique 9 comporte de plus des moyens 22 pour détecter une tension différentielle nulle à la sortie de l'amplificateur opérationnel 17, c'est-à-dire un état de non fonctionnement ou panne du capteur de température 5 choisi. Ces moyens 22 sont reliés, d'une part, à la sortie de l'amplificateur opérationnel 17 et, d'autre part, à l'ordinateur 7, ce qui permet à ce dernier de connaître l'état de non fonctionnement du capteur de température 5 choisi.The electronic plate 9 further comprises means 22 for detecting a zero differential voltage at the output of the operational amplifier 17, that is to say a state of non-operation or failure of the temperature sensor 5 chosen. These means 22 are connected, on the one hand, to the output of the operational amplifier 17 and, on the other hand, to the computer 7, which allows the latter to know the non-functioning state of the temperature 5 chosen.
La plaque électronique 9 comporte enfin des moyens 23 pour détecter à la sortie du dispositif de compensation 19 une tension différentielle supérieure à une tension maximale prédéterminée, c'est-à-dire un état de surchauffe de la zone dε chauffe 3 correspondante. Ces moyens 23 sont reliés, d'une part, à la sortie du dispositif de compensation 19 et , d'autre part, au calculateur 7 afin de lui transmettre un signal de surchauffe lorsque la tension différentielle est supérieure à la tension maximale prédéterminée. Le calculateur 7 comporte des moyens pour couper l'alimentation électrique des éléments de chauffe 4 en cas de réception du signal de surchauffe.The electronic plate 9 finally comprises means 23 for detecting at the output of the compensation device 19 a differential voltage greater than a predetermined maximum voltage, that is to say a state of overheating of the corresponding heating zone 3. These means 23 are connected, on the one hand, to the output of the compensation device 19 and, on the other hand, to the computer 7 in order to transmit an overheating signal to it when the differential voltage is greater than the predetermined maximum voltage. The computer 7 includes means for cutting off the electrical supply to the heating elements 4 in the event of reception of the overheating signal.
En cas de détection du signal de non fonctionnement du capteur de température choisi 5, le calculateur 7, comporte, selon une première variante de réalisation, des moyens pour déterminer une valeur numérique de température probable, en remplacement de la valeur numérique fournie par le convertisseur analogique numérique 20, qui est transmise aux moyens électroniques d'alimentation en puissance 6 en vue de déterminer l'intensité du courant alimentant l'élément de chauffe 4 associé au capteur de température 5 défaillant. Selon un deuxième mode de réalisation préféré, cette valeur numérique de remplacement est déterminée par un microcontrôleur 24 monté sur la plaque électronique 9, ce qui permet de décharger le calculateur 7.In the event of detection of the non-operating signal of the chosen temperature sensor 5, the computer 7 comprises, according to a first alternative embodiment, means for determining a digital value of probable temperature, replacing the digital value supplied by the converter analog digital 20, which is transmitted to the electronic power supply means 6 in order to determine the intensity of the current supplying the heating element 4 associated with the faulty temperature sensor 5. According to a second preferred embodiment, this replacement digital value is determined by a microcontroller 24 mounted on the electronic plate 9, which makes it possible to discharge the computer 7.
Ce microcontrôleur 24 est relié aux moyens de détection 22, au câblage d'adressage 10a au convertisseur analogique numérique 20 et au calculateur 7.This microcontroller 24 is connected to the detection means 22, to the addressing wiring 10a to the analog digital converter 20 and to the computer 7.
Il comporte une mémoire de stockage 25 de l'état de fonctionnement de chaque capteur de température 5, et des moyens 26 permettant de déterminer la valeur numérique de remplacement qui doit être fournie à la sortie du convertisseur analogique numérique 20. Avantageusement, le microcontrôleur 24 est également relié aux moyens de détection 23 de l'état de surchauffe d'une zone de chauffe 3, ce qui lui permet de stocker cette information dans la mémoire de stockage 25.It includes a memory 25 for storing the operating state of each temperature sensor 5, and means 26 for determining the replacement digital value which must be supplied at the output of the analog-to-digital converter 20. Advantageously, the microcontroller 24 is also connected to the means 23 for detecting the overheating state of a heating zone 3, which enables it to store this information in the storage memory 25.
Grâce à cette structure, la plaque électronique 9 peut être disposée au voisinage des éléments chauffants 1 et 2. Elle comporte des moyens pour transformer les tensions relevées aux deux bornes 11, 12 de l'un quelconque des capteurs de température 5 choisi par le calculateur 7 selon une séquence préétablie, en une valeur numérique représentative de la température de la zone de chauffe 3 associé au capteur de température choisi, ainsi que les moyens 22 pour détecter l'état de non fonctionnement du capteur de température choisi. Dans le deuxième mode de réalisation, la plaque électronique 9 transmet une valeur numérique de remplacement au calculateur 7 en cas de défaillance du capteur de température choisi. Celui-ci reçoit en même temps un signal de non fonctionnement qui permet de sortir un message sur la console opérateur du calculateur 7. Les informations stockées dans la mémoire 25 peuvent être traitées ultérieurement par des programmes préétablis afin de connaître l'état des zones de chauffe 3, des éléments de chauffe 4 et des capteurs de température 5 lors de l'entretien.Thanks to this structure, the electronic plate 9 can be placed in the vicinity of the heating elements 1 and 2. It includes means for transforming the voltages detected at the two terminals 11, 12 of any of the temperature sensors 5 chosen by the computer. 7 according to a preset sequence, in a digital value representative of the temperature of the heating zone 3 associated with the chosen temperature sensor, as well as the means 22 for detecting the non-operating state of the chosen temperature sensor. In the second embodiment, the electronic plate 9 transmits a replacement digital value to the computer 7 in the event of failure of the chosen temperature sensor. The latter receives at the same time a non-operating signal which makes it possible to output a message on the operator console of the computer 7. The information stored in the memory 25 can be further processed by preset programs in order to know the state of the areas of heater 3, heater elements 4 and temperature sensors 5 during maintenance.
La valeur numérique N représentative de la température relevée et fournie par le convertisseur analogique 20 est transmise au microcontrôleur 24 par le câblage 21. Le microcontrôleur 24 transmet ensuite cette valeur V ou la valeur de remplacement par te câblage 21a. The digital value N representative of the temperature recorded and supplied by the analog converter 20 is transmitted to the microcontroller 24 by the wiring 21. The microcontroller 24 then transmits this value V or the replacement value by the wiring 21a.

Claims

REVENDICATIONS
1. Système de régulation d'équipements chauffants (1, 2) électriques à hautes températures montés sur une presse destinée à la fabrication de produits en matière plastique ou matériaux composites, lesdits équipements chauffants (1, 2) étant répartis en plusieurs zones de chauffe (3) équipés chacun d'un élément de chauffe (4) et d'un capteur de température (5) ayant deux bornes (13, 14) soumises à une tension électrique, les éléments de chauffe (4) étant alimentés électriquement de façon indépendante par l'intermédiaire de moyens électroniques d'alimention en puissance (6), ledit système de régulation comportant un calculateur (7) destiné à réguler les moyens électroniques d'alimentation en puissance (6) en fonction de consignes déterminées par zone de chauffe (3) et en fonction des indications fournies par lesdits capteurs de température (5). caractérisé en ce qu'il comporte, en outre, des moyens (10, 17, 18, 19) pour transformer les tensions (A et B) relevées aux deux bornes (13, 14) de l'un quelconque desdits capteurs de température (5) choisi par ledit calculateur (7) selon une séquence établie, en une valeur numérique (V) représentative de la température de la zone de chauffe (3) associée audit capteur de température (5) , ladite valeur numérique (N) étant transmise audit calculateur (7) en vue de la régulation des moyens électroniques d'alimentation (6) , des moyens de détection (22) de l'état de bon ou mauvais fonctionnement dudit capteur de température choisi (5) , et des moyens (24, 26) pour déterminer une valeur numérique de remplacement en cas de détection d'un état de mauvais fonctionnement par lesdits moyens de détection (22).1. A system for regulating high temperature electrical heating equipment (1, 2) mounted on a press intended for the manufacture of plastic or composite material products, said heating equipment (1, 2) being distributed in several heating zones (3) each equipped with a heating element (4) and a temperature sensor (5) having two terminals (13, 14) subjected to an electric voltage, the heating elements (4) being electrically supplied independent by means of electronic power supply means (6), said regulation system comprising a computer (7) intended to regulate the electronic power supply means (6) according to set points determined by heating zone (3) and according to the indications provided by said temperature sensors (5). characterized in that it further comprises means (10, 17, 18, 19) for transforming the voltages (A and B) noted at the two terminals (13, 14) of any one of said temperature sensors ( 5) chosen by said computer (7) according to an established sequence, in a digital value (V) representative of the temperature of the heating zone (3) associated with said temperature sensor (5), said digital value (N) being transmitted to said computer (7) for the regulation of the electronic supply means (6), of the detection means (22) of the state of good or bad functioning of said chosen temperature sensor (5), and of the means (24 , 26) to determine a replacement digital value in the event of detection of a state of malfunction by said detection means (22).
2. Système selon la revendication 1, caractérisé en ce que les moyens pour transformer les tensions (A et B) relevées en une valeur numérique (V) comportent : un multiplexeur (10) relié audit calculateur (7) par un câblage (10a) servant à l'adressage d'un capteur de température (5) et à chacun desdits capteurs de mesure (5) par deux fils électriques (11, 12) , ledit multiplexeur (10) fournissant en sortie les deux tensions (A, B) relevées aux deux bornes (13, 14) du capteur de température choisi (5) par ledit calculateur (7), un amplificateur opérationnel (17) relié audit multiplexeur (10) pour recevoir lesdites deux tensions (A, B) et fournissant en sortie une tension différentielle (A-B), un moyen (18) pour linéariser ladite tension différentielle (A-B), et un convertisseur analogique numérique (20) relié audit calculateur (7) et destiné à transformer la tension différentielle (A-B) fournie par ledit moyen de linéarisation (18) en une valeur numérique (V) représentative de la température mesurée, et en ce que les moyens de détection (22) de l'état de bon ou mauvais fonctionnement du capteur de température choisi (5) sont interposés entre ledit amplificateur opérationnel (17) et ledit calculateur (7) et fournissent audit calculateur (7) un signal de panne lorsque la tension différentielle (A-B) est nulle.2. System according to claim 1, characterized in that the means for transforming the voltages (A and B) taken into a digital value (V) comprise: a multiplexer (10) connected to said computer (7) by a wiring (10a) used for addressing a temperature sensor (5) and to each of said measurement sensors (5) by two electric wires (11, 12), said multiplexer (10) supplying the two voltages (A, B) noted at the two terminals (13, 14) of the chosen temperature sensor (5) by said computer (7), an operational amplifier (17) connected to said multiplexer (10) for receiving said two voltages (A, B) and outputting a differential voltage (AB), means (18) for linearizing said differential voltage (AB), and a converter analog digital (20) connected to said computer (7) and intended to transform the differential voltage (AB) supplied by said linearization means (18) into a digital value (V) representative of the measured temperature, and in that the means of detection (22) of the state of good or bad functioning of the chosen temperature sensor (5) are interposed between said operational amplifier (17) and said computer (7) and supply to said computer (7) a fault signal when the voltage differential (AB) is zero.
3. Système selon la revendication 2, caractérisé en ce que les moyens (26) pour déterminer la valeur numérique de remplacement en cas de détection d'un mauvais état de fonctionnement du capteur de température choisi (5) sont prévus dans ledit calculateur (7).3. System according to claim 2, characterized in that the means (26) for determining the replacement digital value in the event of detection of a poor operating condition of the chosen temperature sensor (5) are provided in said computer (7 ).
4. Système selon la revendication 2, caractérisé en ce que les moyens pour déterminer la valeur numérique de remplacement en cas de détection d'un état de mauvais fonctionnement du capteur de température choisi (5) comportent un microcontrôleur (24) relié auxdits moyens de détection (22), audit convertisseur (20) et audit calculateur (7).4. System according to claim 2, characterized in that the means for determining the digital replacement value in the event of detection of a malfunction state of the chosen temperature sensor (5) comprise a microcontroller (24) connected to said means of detection (22), said converter (20) and said computer (7).
5. Système selon la revendication 4, caractérisé en que ledit microcontrôleur (24) est de plus relié audit calculateur (7) par le câblage (10a) servant à l'adressage d'un capteur de température (5) et comporte une mémoire de stockage (25) de l'état de fonctionnement de chaque capteur de température (5).5. System according to claim 4, characterized in that said microcontroller (24) is further connected to said computer (7) by the wiring (10a) used for addressing a temperature sensor (5) and comprises a memory of storage (25) of the operating state of each temperature sensor (5).
6. Système selon l'une quelconque des revendications 2 à 5, caractérisé en ce qu'il comporte de plus des moyens (23) pour détecter une surchauffe de la zone de chauffe (3) associée au capteur de température choisi (5), lesdits moyens étant interposés entre ledit moyen de linéarisation (18) et ledit calculateur (7) et fournissant audit calculateur (7) un signal de surchauffe lorsque la tension différentielle (A-B) est supérieure à une tension maximale prédéterminée.6. System according to any one of claims 2 to 5, characterized in that it further comprises means (23) for detecting an overheating of the heating zone (3) associated with the chosen temperature sensor (5), said means being interposed between said linearization means (18) and said computer (7) and providing said computer (7) with an overheating signal when the differential voltage (AB) is greater than a predetermined maximum voltage.
7. Système selon la revendication 6, caractérisé en ce que ledit calculateur (7) comporte des moyens pour couper l'alimentation électrique des éléments de chauffe (3) en cas de réception du signal de surchauffe. 7. System according to claim 6, characterized in that said computer (7) comprises means for cutting off the electrical supply to the heating elements (3) in the event of reception of the overheating signal.
PCT/FR1993/000507 1992-05-25 1993-05-25 System for the control of heating equipment divided into several heating areas and used in the manufacture of composite material products WO1993024877A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9206376A FR2691555B1 (en) 1992-05-25 1992-05-25 System of regulation of the heating equipment by regulated zones for the implementation of products in composite materials.
FR92/06376 1992-05-25

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WO1993024877A1 true WO1993024877A1 (en) 1993-12-09

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FR (1) FR2691555B1 (en)
TW (1) TW232764B (en)
WO (1) WO1993024877A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0917028A1 (en) * 1997-11-14 1999-05-19 Murata Kikai Kabushiki Kaisha Heater control apparatus for textile machine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2094516A (en) * 1980-07-31 1982-09-15 Uk Nii Stankov Instr Method and device for automatic temperature control
FR2503891A1 (en) * 1981-04-14 1982-10-15 Uk I Stankov Temp. control system with automatic compensation - for sensor feedback failure, for use with temp. sensitive moulding processes etc.
GB2100474A (en) * 1981-04-03 1982-12-22 Toyota Motor Co Ltd Air conditioning control method
DE3311927A1 (en) * 1982-04-02 1983-09-01 Nissan Motor Co., Ltd., Yokohama, Kanagawa ADDITIONAL SYSTEM AND METHOD FOR AN ENGINE COOLANT TEMPERATURE SENSOR IN AN ELECTRONIC ENGINE CONTROL SYSTEM
EP0165114A1 (en) * 1984-05-16 1985-12-18 Albert Denis S.A. Process and apparatus for the thermal regulation of hot runner moulds
JPH03175226A (en) * 1989-12-01 1991-07-30 Hitachi Ltd Operating system in abnormality of sensor of air conditioner

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2094516A (en) * 1980-07-31 1982-09-15 Uk Nii Stankov Instr Method and device for automatic temperature control
GB2100474A (en) * 1981-04-03 1982-12-22 Toyota Motor Co Ltd Air conditioning control method
FR2503891A1 (en) * 1981-04-14 1982-10-15 Uk I Stankov Temp. control system with automatic compensation - for sensor feedback failure, for use with temp. sensitive moulding processes etc.
DE3311927A1 (en) * 1982-04-02 1983-09-01 Nissan Motor Co., Ltd., Yokohama, Kanagawa ADDITIONAL SYSTEM AND METHOD FOR AN ENGINE COOLANT TEMPERATURE SENSOR IN AN ELECTRONIC ENGINE CONTROL SYSTEM
EP0165114A1 (en) * 1984-05-16 1985-12-18 Albert Denis S.A. Process and apparatus for the thermal regulation of hot runner moulds
JPH03175226A (en) * 1989-12-01 1991-07-30 Hitachi Ltd Operating system in abnormality of sensor of air conditioner

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
TRANSACTIONS OF THE INSTITUTE OF MEASUREMENT AND CONTROL vol. 13, no. 2, 1991, DORKING GB pages 75 - 90 J.MCGHEE ET AL 'Electronics and computers in thermal systems: Reviewing current trends' *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0917028A1 (en) * 1997-11-14 1999-05-19 Murata Kikai Kabushiki Kaisha Heater control apparatus for textile machine

Also Published As

Publication number Publication date
FR2691555B1 (en) 1995-04-28
AU4330093A (en) 1993-12-30
FR2691555A1 (en) 1993-11-26
TW232764B (en) 1994-10-21

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