FR2488992A2 - Temp. monitoring circuit for engine crankshaft - uses thermistor coupled to coil to amplitude modulate carrier for detection and comparison with reference values - Google Patents
Temp. monitoring circuit for engine crankshaft - uses thermistor coupled to coil to amplitude modulate carrier for detection and comparison with reference values Download PDFInfo
- Publication number
- FR2488992A2 FR2488992A2 FR8018476A FR8018476A FR2488992A2 FR 2488992 A2 FR2488992 A2 FR 2488992A2 FR 8018476 A FR8018476 A FR 8018476A FR 8018476 A FR8018476 A FR 8018476A FR 2488992 A2 FR2488992 A2 FR 2488992A2
- Authority
- FR
- France
- Prior art keywords
- coil
- temperature
- temp
- comparison
- detection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/04—Thermometers specially adapted for specific purposes for measuring temperature of moving solid bodies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K3/00—Thermometers giving results other than momentary value of temperature
- G01K3/005—Circuits arrangements for indicating a predetermined temperature
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
Description
L'objet de l'invention concerne une première addition apportée au Brevet Français NO 79 20 749 du 09/08/1979, pour un dispositif de contrôle de température (ou d'autre paramètre physique binaire) de pièces à mouvement périodique. The object of the invention relates to a first addition to French Patent NO 79 20 749 of 08/09/1979, for a device for controlling the temperature (or other binary physical parameter) of parts with periodic movement.
Il est destiné à permettre la mesure permanente et le contrôle de la température de pièces à mouvement périodique. It is intended to allow permanent measurement and temperature control of parts with periodic movement.
Les appareillages connus limitent les applications des dispositifs destinés à ces contrôles à la mesure des températures, mais elles ne permettent pas de mesurer en même temps la mesure permanente de la température de pièces à mouvement périodique. Known apparatuses limit the applications of the devices intended for these controls to the measurement of temperatures, but they do not make it possible to measure at the same time the permanent measurement of the temperature of parts with periodic movement.
Dans les systèmes connus, le mouvement demandé était circulaire uniquement ou rectiligne uniquement. Une autre différence apparait dans le principe de la détection de la grandeur à mesurer : équivalent transformateur qui reçoit le signal par son primaire et le renvoie par son secondaire, ou bien encore une pièce en mouvement rectiligne, minces et d'épaisseurs constantes passant par l'entrefer d'un équivalent transformateur et aboutissant non pas à une mesure vraie de la température, mais à une mesure comparative par rapport à la température du local où s'effectue la mesure. In known systems, the movement requested was circular only or rectilinear only. Another difference appears in the principle of the detection of the quantity to be measured: transformer equivalent which receives the signal by its primary and returns it by its secondary, or even a piece in rectilinear movement, thin and of constant thickness passing through l air gap of a transformer equivalent and leading not to a true measurement of the temperature, but to a comparative measurement compared to the temperature of the room where the measurement is made.
Le dispositif suivant l'invention est destiné à être appliqué sur toute pièce en mouvement, dès lors que ce dernier est périodique, à trajectoire connue et constante, telles les bielles de moteurs Diesel et à combustion interne en général. The device according to the invention is intended to be applied to any moving part, as long as the latter is periodic, with known and constant trajectory, such as the connecting rods of diesel engines and internal combustion in general.
La trajectoire pouvant avoir une courbe compliquée ou non. Il peut s'agir de mouvement circulaire, elliptique, rectiligne ou quelconque. La vitesse du mouvement peut être constante ou non. Le sens du mouvement est indifférent. The trajectory can have a complicated curve or not. It can be circular, elliptical, rectilinear or arbitrary movement. The speed of movement may or may not be constant. The direction of movement is indifferent.
Le dispositif suivant l'invention est constitué par la combinaison d'une bobine fixe, émettrice d'un champ magnétique dont une partie du flux est captée par une bobine réceptrice fixe, ainsi que d'une troisième bobine fixée sur la pièce mobile formant éran entre les deux autres, lors de son passage. The device according to the invention consists of the combination of a fixed coil, emitting a magnetic field, part of the flux of which is picked up by a fixed receiving coil, as well as a third coil fixed on the moving part forming a screen. between the other two, during its passage.
Sur les dessins annexés donnés à titre d'exemple non limitatif d'une des formes de réalisation de l'objet de l'invention
La figure 1 représente le dispositif dans son ensemble.In the accompanying drawings given by way of nonlimiting example of one of the embodiments of the subject of the invention
Figure 1 shows the device as a whole.
La figure 2 montre la répartition du champ magnétique. Figure 2 shows the distribution of the magnetic field.
La figure 3 représente le synoptique de la partie électronique. Figure 3 shows the block diagram of the electronic part.
Pour réaliser une mesure permanente de la température, la bobine émettrice 1 est excitée à une fréquence de l'ordre de 35 à 60 KHertz et crée un champ magnétique dont une partie du flux est captée par la bobine réceptrice 2. To carry out a permanent measurement of the temperature, the transmitting coil 1 is excited at a frequency of the order of 35 to 60 KHertz and creates a magnetic field, part of the flux of which is picked up by the receiving coil 2.
Le flux commun est coupé à chaque passage de la bobine 3. Cette dernière est reliée à une bielle 5 par exemple, au moyen du plongeur 4 à 1 ' autre extrémité duquel se trouve une thermistance à coefficient de température négatif, placée dans la zone dont on veut mesurer et contrôler la température. The common flow is cut at each passage of the coil 3. The latter is connected to a connecting rod 5 for example, by means of the plunger 4 at the other end of which is a thermistor with a negative temperature coefficient, placed in the zone whose we want to measure and control the temperature.
La thermistance est telle qu' à température normale (70 à 90 C) elle présente une valeur d'environ 1000 à 1500 ohms, suivant une ligne exponentielle. The thermistor is such that at normal temperature (70 to 90 C) it has a value of about 1000 to 1500 ohms, along an exponential line.
Lors du passage de la bobine 3 entre les deux bobines émettrice et réceptrice 1 et 2 celle-ci crée un affaiblissement de la porteuse dont la valeur dépend de la résistance de la thermistance, donc de la température à mesurer. During the passage of the coil 3 between the two transmitting and receiving coils 1 and 2 it creates a weakening of the carrier, the value of which depends on the resistance of the thermistor, therefore on the temperature to be measured.
Cette porteuse ainsi modulée par l'effet de la température est ensuite amplifiée par 8 et démodulée en 9 de manière à obtenir une tension continue image de la température. Par un convertisseur 10 tension/courant, on obtient un courant continu image de la température à mesurer, envoyé directement sur un galvanomètre de lecture 15. This carrier thus modulated by the effect of the temperature is then amplified by 8 and demodulated at 9 so as to obtain a continuous image voltage of the temperature. By a voltage / current converter 10, a direct current image of the temperature to be measured is obtained, sent directly to a reading galvanometer 15.
Par ailleurs, l'information est aussi envoyée à l'entrée de deux comparateurs 11 et 13 l'un pour un seuil d'alarme de température haute, l'autre pour un seuil d'alarme de température basse, assurant ainsi la fonction de contrôle. Furthermore, the information is also sent to the input of two comparators 11 and 13, one for a high temperature alarm threshold, the other for a low temperature alarm threshold, thus ensuring the function of control.
Le système utilise une transmission herztienne dont tenus les éléments actifs se trouvent sur la tartie fixe. The system uses a herztienne transmission of which held the active elements are on the fixed tartie.
L'élément mobile 3 ne porte que des composants t;as- sifs simples, robustes et indéréaglables. The movable element 3 only carries simple, robust and irreversible components;
Le systèmes est à sécurité positive car en cas ce rupture de la therinistance, cette dernière prend une valeur ohmique très élevée (l'infini) assimilable à l'effet d1une tempé- rature basse. The system is positive security because in the event of this rupture of the thermistor, the latter takes a very high ohmic value (infinity) comparable to the effect of a low temperature.
A ce moment la, le comparateur calé sur la consigne de température basse, déclenche l'alarme. At this time, the comparator set to the low temperature setpoint triggers the alarm.
Le déclenchement d'un des seuils d'alarme a lieu mer-e en cas de défaillance de l'électronique d'émission de signal ou de traitement de l'information. The triggering of one of the alarm thresholds takes place in the event of a failure in the signal transmission or information processing electronics.
Le prix de revient réduit de ces systèmes lui permet une application dans toute machine autre que le moteur Diesel et son coussinet de tête de bielle en particulier. The reduced cost price of these systems allows it to be applied in any machine other than the diesel engine and its big end bearing in particular.
Toutefois les formes, dimensions et dispositions des différents éléments pourront varier dans la limite des équivalents comme d'ailleurs les matières utilisées pour leur fabrication, sans changer pour cela la conception générale de 1 ' invention qui vient d'être décrite. However, the shapes, dimensions and arrangements of the various elements may vary within the limit of equivalents, as indeed the materials used for their manufacture, without thereby changing the general design of the invention which has just been described.
Claims (4)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8018476A FR2488992B2 (en) | 1979-08-09 | 1980-08-22 | DEVICE FOR CONTROLLING TEMPERATURE OR OTHER BINARY PHYSICAL PARAMETER OF PARTS WITH PERIODIC MOVEMENT |
EP81430027A EP0051035A1 (en) | 1980-08-22 | 1981-08-17 | Device for controlling the temperature (or another binary physical parameter) of periodically moving objects |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7920749A FR2466008A1 (en) | 1979-08-09 | 1979-08-09 | Temp. measuring appts. for e.g. IC engine crank arm - uses thermistor to vary coupling between oscillator and receiver coil circuits |
FR8018476A FR2488992B2 (en) | 1979-08-09 | 1980-08-22 | DEVICE FOR CONTROLLING TEMPERATURE OR OTHER BINARY PHYSICAL PARAMETER OF PARTS WITH PERIODIC MOVEMENT |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2488992A2 true FR2488992A2 (en) | 1982-02-26 |
FR2488992B2 FR2488992B2 (en) | 1987-10-02 |
Family
ID=26221317
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8018476A Expired FR2488992B2 (en) | 1979-08-09 | 1980-08-22 | DEVICE FOR CONTROLLING TEMPERATURE OR OTHER BINARY PHYSICAL PARAMETER OF PARTS WITH PERIODIC MOVEMENT |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2488992B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2662799A1 (en) * | 1990-06-01 | 1991-12-06 | Fichtel & Sachs Ag | DEVICE FOR MONITORING THE TEMPERATURE OF A MOVING CONSTRUCTION ELEMENT, PARTICULARLY A FRICTION CLUTCH. |
EP1173737B1 (en) | 1999-03-26 | 2016-03-09 | Kongsberg Maritime AS | Device and system for monitoring internal temperature of inaccessible or moving parts |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1616431B1 (en) * | 1968-03-08 | 1971-11-11 | Dieners Honeywell Holding Gmbh | Device for contactless temperature measurement on a rotating machine part |
FR2178917A1 (en) * | 1972-04-01 | 1973-11-16 | Voith Gmbh | |
US3927571A (en) * | 1974-01-18 | 1975-12-23 | Hobart Corp | Temperature indicating device |
FR2396964A1 (en) * | 1977-07-04 | 1979-02-02 | Voith Turbo Kg | TEMPERATURE MONITORING DEVICE ON A MOVING ORGAN |
-
1980
- 1980-08-22 FR FR8018476A patent/FR2488992B2/en not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1616431B1 (en) * | 1968-03-08 | 1971-11-11 | Dieners Honeywell Holding Gmbh | Device for contactless temperature measurement on a rotating machine part |
FR2178917A1 (en) * | 1972-04-01 | 1973-11-16 | Voith Gmbh | |
US3927571A (en) * | 1974-01-18 | 1975-12-23 | Hobart Corp | Temperature indicating device |
FR2396964A1 (en) * | 1977-07-04 | 1979-02-02 | Voith Turbo Kg | TEMPERATURE MONITORING DEVICE ON A MOVING ORGAN |
Non-Patent Citations (1)
Title |
---|
IBM TECHNICAL DISCLOSURE BULLETIN, vol. 20, no. 3, août 1977, page 898, New York, US; R.M. DAVENPORT, JR. et al.: "Temperature-monitoring circuits" * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2662799A1 (en) * | 1990-06-01 | 1991-12-06 | Fichtel & Sachs Ag | DEVICE FOR MONITORING THE TEMPERATURE OF A MOVING CONSTRUCTION ELEMENT, PARTICULARLY A FRICTION CLUTCH. |
EP1173737B1 (en) | 1999-03-26 | 2016-03-09 | Kongsberg Maritime AS | Device and system for monitoring internal temperature of inaccessible or moving parts |
EP1173737B2 (en) † | 1999-03-26 | 2019-05-08 | Kongsberg Maritime AS | Device and system for monitoring internal temperature of inaccessible or moving parts |
Also Published As
Publication number | Publication date |
---|---|
FR2488992B2 (en) | 1987-10-02 |
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