WO2017068307A1 - Motor-vehicle temperature sensor comprising a thermocouple - Google Patents

Motor-vehicle temperature sensor comprising a thermocouple Download PDF

Info

Publication number
WO2017068307A1
WO2017068307A1 PCT/FR2016/052754 FR2016052754W WO2017068307A1 WO 2017068307 A1 WO2017068307 A1 WO 2017068307A1 FR 2016052754 W FR2016052754 W FR 2016052754W WO 2017068307 A1 WO2017068307 A1 WO 2017068307A1
Authority
WO
WIPO (PCT)
Prior art keywords
thermocouple
printed circuit
metal wires
temperature sensor
temperature
Prior art date
Application number
PCT/FR2016/052754
Other languages
French (fr)
Inventor
Piotr ZAKRZEWSKI
Mahmoud Sfaxi
Vincent Guibet
Original Assignee
Valeo Systemes De Controle Moteur
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 Valeo Systemes De Controle Moteur filed Critical Valeo Systemes De Controle Moteur
Priority to DE112016004846.7T priority Critical patent/DE112016004846T5/en
Publication of WO2017068307A1 publication Critical patent/WO2017068307A1/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
    • G01K7/021—Particular circuit arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
    • G01K7/023—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples provided with specially adapted connectors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K2205/00—Application of thermometers in motors, e.g. of a vehicle

Definitions

  • the present invention relates to a temperature sensor for a motor vehicle engine.
  • Temperature sensors comprising a thermocouple for measuring high temperatures are widely used in the field of internal combustion engine exhaust systems.
  • Thermocouples provide relatively high measurement accuracy.
  • thermocouple measurement principle is based on the Seebeck effect, which results in a potential difference between two different metal wires when subjected to a temperature difference.
  • the two metal wires are welded together at a first end forming a hot weld (or hot spot) for measuring the temperature T1 of the medium to be measured, such as the temperature of the exhaust gas of an exhaust system. .
  • the two metal wires of the thermocouple also each comprise a second end each connected to a voltmeter by a weld commonly called cold junction (or cold point) which is at a reference temperature T0.
  • This type of temperature sensor is known to include a printed circuit board (PCB) comprising an integrated circuit integrating the voltmeter.
  • the integrated circuit is an Application Specific Integrated Circuit (ASIC) capable of processing voltage signals for conversion to temperature. It is able to provide an analog or digital output signal and use a protocol (“SENT").
  • ASIC Application Specific Integrated Circuit
  • the voltage signal measured by the voltmeter at the second ends of the metal wires is transmitted to the printed circuit via electrical conductors and then to the integrated circuit.
  • the voltage variation between these two second ends of the metal wires of the thermocouple is proportional to the temperature variation between the hot solder which is at temperature T1 and the second ends of the metal wires which are at a reference temperature T0.
  • the integrated circuit incorporates a temperature probe for calibrating the voltmeter whose measurement depends on the temperature.
  • this probe is already present, it is usually used to measure the reference temperature T0 in the integrated circuit for reasons of simplification of the temperature sensor and to reduce costs.
  • the integrated circuit is distant from the second ends of the metal wires (or cold junction).
  • the reference temperature TO read at the integrated circuit is different from the temperature of the second ends of the metal wires (or cold junction).
  • the temperature difference can be from 4 ° C. to 5 ° C., thus inducing a source of error and inaccuracy on the temperature T1 of the medium to be measured.
  • the invention therefore aims to overcome this drawback of the prior art by providing a more accurate temperature sensor in which the sources of error are reduced.
  • the invention relates to a temperature sensor for a motor vehicle engine, comprising:
  • thermocouple comprising two metal wires made of different metals welded to each other at a first end forming a hot solder for measuring a temperature T1 in the motor, said two metal wires each having a second end,
  • thermocouple a printed circuit comprising an integrated circuit, said integrated circuit comprising a voltmeter and a temperature probe measuring a reference temperature TO, the metal wires of the thermocouple being electrically connected to two respective terminals of the printed circuit by two respective electrical connection means, and
  • a protective housing in which are housed the second ends of the metal son and the printed circuit.
  • each of these electrical connection means is made of the same metal as that of the wire of the thermocouple to which it is connected, the voltmeter of the integrated circuit measuring the voltage between the two terminals of the printed circuit.
  • each electrical connection means comprises an electrical conductor connected on the one hand to a second end of a wire of the thermocouple and on the other hand to one of the terminals of the printed circuit.
  • each electrical connection means is formed by one of the metal son of the thermocouple, each second end of the metal son extending to a terminal of the printed circuit.
  • the distance between the terminals of the printed circuit and the integrated circuit is less than 6 mm and preferably less than 2.5 mm.
  • thermocouple is of type J, K, T, R, S or N.
  • the two metal wires of the thermocouple and the two electrical connection means are formed of a pair of Nisil / Nicrosil metals.
  • the invention thus provides a more accurate temperature sensor in which the sources of error are reduced.
  • thermocouple The continuity of the thermocouple is extended to the printed circuit.
  • the cold junction or cold spot is located at the printed circuit board.
  • thermocouple The thermal distance between the integrated circuit and the cold point formed by the two second ends of the metal wires of the thermocouple is reduced.
  • the point of measurement of the voltage is in the immediate vicinity of the integrated circuit.
  • the high thermal conductivity of the printed circuit allows a good transmission of the heat from the cold point to the integrated circuit and a quasi homogeneity of the temperatures.
  • thermocouple The temperature difference between the second ends of the two metal wires of the thermocouple and the temperature probe which is integrated in the integrated circuit measuring a reference temperature T0 is reduced, from 4 ° C or 5 ° C to less than 1 ° vs.
  • the invention thus makes it possible to use the temperature probe already integrated in the integrated circuit while providing an error on the minimum reference temperature T0.
  • FIG. 1 is a schematic representation of the inside of a temperature sensor seen in profile according to the invention.
  • FIG. 1 represents the interior of a temperature sensor 1 for a motor vehicle engine according to the invention.
  • the temperature sensor 1 comprises a thermocouple 2 having two different wires 3 welded together at a first end forming a hot weld to measure a temperature T1 in the motor (not shown).
  • the temperature T1 corresponds to the temperature of the medium to be measured.
  • the metal wires 3 consist of two different metals, for example a pair of Nisil / Nicrosil metals.
  • Thermocouple 2 is of type J, K, T, R, S, N, for example.
  • the metal wires 3 of the thermocouple 2 are electrically connected to two respective terminals 1 1 of the printed circuit 5 by two respective electrical connection means 10.
  • the temperature sensor 1 comprises a printed circuit 5 comprising an integrated circuit 6.
  • the integrated circuit 6 comprises the voltmeter and a temperature sensor measuring a reference temperature T0.
  • the integrated circuit 6 is an application-specific integrated circuit ASIC (Application Specific for Integrated Circuit) capable of processing voltage signals to convert them into temperature. It is able to provide an analog or digital output signal and use a protocol ("SENT").
  • ASIC Application Specific for Integrated Circuit
  • the two metal wires 3 of the thermocouple 2 each comprise a second end 4.
  • the temperature sensor 1 comprises a polymer protective housing 7 in which are housed the second ends 4 of the metal wires 3 of the thermocouple 2 and the printed circuit 5.
  • each of these electrical connection means 1 0 consists of the same metal as that of the metal wire 3 of the thermocouple 2 to which it is connected.
  • the voltmeter of the integrated circuit 6 measures the voltage between the two terminals 1 1 of the printed circuit 5.
  • the temperature T1 of the hot point is deduced, which corresponds to the temperature of the medium to be measured. in the vehicle engine.
  • each electrical connection means 1 0 comprises an electrical conductor 1 0 connected on the one hand to a second end 4 of a metal wire 3 of the thermocouple 2 and on the other hand to one of the terminals 1 1 of the printed circuit 5, as shown in FIG.
  • the electrical conductors 1 0 are distinct elements of the metal wires 3 of the thermocouple 2 but constituted respectively by the same metals.
  • the electrical continuity is ensured up to the terminals 1 1 of the printed circuit 5.
  • the second ends 4 of the metal wires 3 of the thermocouple 2 are distant from the printed circuit 5, as shown in FIG.
  • thermocouple 2 makes it possible to bring the cold point or cold junction back to the terminals 1 1 of the printed circuit 5.
  • the voltmeter measures the voltage between the two terminals 1 1 of the printed circuit 5.
  • the second ends 4 of the metal wires 3 are arranged below the printed circuit 5.
  • the metal wires 3 and the printed circuit 5 are substantially parallel.
  • thermocouple 2 The second ends 4 of the metal wires 3 of the thermocouple 2 are integral with a first connector 14 connected to the protective housing 7.
  • the second ends 4 of the metal wires 3 of the thermocouple 2 are electrically connected to the two electrical conductors 10 by welding or crimping, for example.
  • the two electrical conductors 10 are soldered to the two terminals 1 1 of the printed circuit 5.
  • the two terminals 1 1 pass through the printed circuit 5 and project on the two faces 9a, 9b of the printed circuit 5.
  • the protective housing 7 comprises two compartments 1 2, 1 3 separated by the printed circuit 5, a first compartment 1 2 in which are housed the second ends 4 of the metal wires 3 of the thermocouple 2 and the electrical connection means 1 0 and a second compartment 13 opposite.
  • the temperature sensor 1 also includes a second connector 19 for electrically connecting it to an electronic device (not shown). of the second connection terminals 20 are provided as well as electrical wires 21 for connecting the printed circuit 5 to the second connector 1 9.
  • the printed circuit 5 comprises a first surface 9a which is located on the side of the second ends 4 of the two metal wires 3 of the thermocouple 2 and a second opposite surface 9b delimiting the second compartment 13 of the protective housing 7.
  • the integrated circuit 6 is placed on the first surface 9a of the printed circuit 5 on the side of the electrical connection means 1 0.
  • the integrated circuit 6 is placed on the second surface 9b of the printed circuit 5.
  • the distance between the terminals 1 1 of the printed circuit 5 protruding from this first surface surface 9a and the integrated circuit 6 is less than 6 mm and is preferably smaller. at 2.5 mm.
  • the printed circuit 5 is a good thermal conductor. It transmits the calories from the terminals 1 1 of the printed circuit 5 to the integrated circuit 6 comprising the temperature sensor measuring the reference temperature T0.
  • Thermal losses are thus reduced.
  • the temperature difference between the second ends 4 of the two metal wires 3 of the thermocouple 2 and the temperature probe measuring the reference temperature T0 is reduced, from 4 ° C. or 5 ° C. to less than 1 ° C.
  • each electrical connection means 1 0 is formed by one of the metal wires 3 of the thermocouple 2.
  • Each second end 4 of the metal wires 3 extends to one of the terminals 1 1 of the printed circuit 5.
  • thermocouple 2 extend directly to the terminals 1 1 of the printed circuit 5.
  • thermocouple 2 The two metal wires 3 of the thermocouple 2 are soldered directly to the terminals 1 1 of the printed circuit 5.
  • the metal wires 3 of the thermocouple 2 being made up of several very thin metal wires which are difficult to weld on the terminals 1 1 of the printed circuit 5, the embodiment using an electrical conductor 10 distinct from the metal wires 3 of the thermocouple 2 is preferred over the embodiment described above.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

Motor-vehicle engine temperature sensor comprising a thermocouple. The subject of the present invention is a motor-vehicle engine temperature sensor (1) comprising: a thermocouple (2) including two metal wires (3) made of different metals that are welded together at a first end forming a hot weld for measuring a temperature T1 in the engine, said two metal wires (3) each having a second end (4); a printed circuit board (5) comprising an integrated circuit (6), said integrated circuit (5) comprising a voltmeter and a temperature probe measuring a reference temperature T0, the metal wires (3) of the thermocouple (2) being electrically connected to two respective terminals (11) of the printed circuit board (5) by respective electrical connection means (10); and a protective casing (7) in which the second ends (4) of the metal wires (3) and the printed circuit board (5) are housed. According to the invention, each of these electrical connection means (10) is made of the same metal as that of the metal wire (3) of the thermocouple (2) to which it is connected, the voltmeter of the integrated circuit (6) measuring the voltage between the two terminals (11) of the printed circuit board (5).

Description

CAPTEUR DE TEMPÉRATURE POUR VÉHICULE AUTOMOBILE  TEMPERATURE SENSOR FOR MOTOR VEHICLE
COMPRENANT UN THERMOCOUPLE  COMPRISING A THERMOCOUPLE
La présente invention concerne un capteur de température pour moteur de véhicule automobile. The present invention relates to a temperature sensor for a motor vehicle engine.
Les capteurs de température comprenant un thermocouple pour mesurer les hautes températures sont largement utilisés dans le domaine des systèmes d'échappement de moteur à combustions interne.  Temperature sensors comprising a thermocouple for measuring high temperatures are widely used in the field of internal combustion engine exhaust systems.
Les thermocouples fournissent une précision de mesure relativement élevée. Thermocouples provide relatively high measurement accuracy.
C'est pourquoi ils sont utilisés dans ce domaine ayant des exigences élevées en termes de contrôle d'émissions de polluants. That is why they are used in this field having high requirements in terms of control of pollutant emissions.
Le principe de mesure des thermocouples est basé sur l'effet Seebeck qui se traduit par une différence de potentiel entre deux fils de métaux différents lorsqu'ils sont soumis à une différence de température.  The thermocouple measurement principle is based on the Seebeck effect, which results in a potential difference between two different metal wires when subjected to a temperature difference.
Les deux fils de métaux sont soudés entre eux à une première extrémité formant une soudure chaude (ou point chaud) destinée à mesurer la température T1 du milieu à mesurer, comme par exemple la température des gaz d'échappement d'un système d'échappement.  The two metal wires are welded together at a first end forming a hot weld (or hot spot) for measuring the temperature T1 of the medium to be measured, such as the temperature of the exhaust gas of an exhaust system. .
Les deux fils métalliques du thermocouple comportent également chacun une deuxième extrémité reliée chacune à un voltmètre par une soudure communément appelée soudure froide (ou point froid) qui est à une température de référence T0.  The two metal wires of the thermocouple also each comprise a second end each connected to a voltmeter by a weld commonly called cold junction (or cold point) which is at a reference temperature T0.
Ce type de capteur de température est connu pour comprendre un circuit imprimé (PCB) comportant un circuit intégré intégrant le voltmètre. Le circuit intégré est un circuit intégré à application spécifique ASIC (Application Spécifie for Integrated Circuit) capable de traiter des signaux de tension pour les convertir en température. Il est capable de fournir un signal de sortie analogique ou numérique et d'utiliser un protocole (« SENT »).  This type of temperature sensor is known to include a printed circuit board (PCB) comprising an integrated circuit integrating the voltmeter. The integrated circuit is an Application Specific Integrated Circuit (ASIC) capable of processing voltage signals for conversion to temperature. It is able to provide an analog or digital output signal and use a protocol ("SENT").
Le signal de tension mesuré par le voltmètre aux deuxièmes extrémités des fils métalliques est transmis au circuit imprimé via des conducteurs électriques puis au circuit intégré.  The voltage signal measured by the voltmeter at the second ends of the metal wires is transmitted to the printed circuit via electrical conductors and then to the integrated circuit.
La variation de tension entre ces deux deuxièmes extrémités des fils métalliques du thermocouple est proportionnelle à la variation de température entre la soudure chaude qui est à la température T1 et les deuxièmes extrémités des fils métalliques qui sont à une température de référence T0.  The voltage variation between these two second ends of the metal wires of the thermocouple is proportional to the temperature variation between the hot solder which is at temperature T1 and the second ends of the metal wires which are at a reference temperature T0.
En connaissant la température de référence T0 du point froid et la tension entre les deuxièmes extrémités des fils métalliques, il est possible de déduire la température T1 du point chaud.  By knowing the reference temperature T0 of the cold point and the voltage between the second ends of the metal wires, it is possible to deduce the temperature T1 from the hot point.
Dans ce type de capteur de température, le circuit intégré intègre une sonde de température pour la calibration du voltmètre dont la mesure dépend de la température. Cette sonde étant déjà présente, elle est habituellement utilisée pour mesurer la température de référence T0 dans le circuit intégré pour des raisons de simplification du capteur de température et pour réduire les coûts. Cependant, le circuit intégré est distant des deuxièmes extrémités des fils métalliques (ou soudure froide). In this type of temperature sensor, the integrated circuit incorporates a temperature probe for calibrating the voltmeter whose measurement depends on the temperature. As this probe is already present, it is usually used to measure the reference temperature T0 in the integrated circuit for reasons of simplification of the temperature sensor and to reduce costs. However, the integrated circuit is distant from the second ends of the metal wires (or cold junction).
Par conséquent, la température de référence TO lue à l'endroit du circuit intégré est différente de la température des deuxièmes extrémités des fils métalliques (ou soudure froide). La différence de température peut être de 4°C à 5°C induisant alors une source d'erreur et imprécision sur la température T1 du milieu à mesurer.  Therefore, the reference temperature TO read at the integrated circuit is different from the temperature of the second ends of the metal wires (or cold junction). The temperature difference can be from 4 ° C. to 5 ° C., thus inducing a source of error and inaccuracy on the temperature T1 of the medium to be measured.
L'invention a donc pour objectif de pallier à cet inconvénient de l'art antérieur en proposant un capteur de température plus précis dans lequel les sources d'erreur sont réduites.  The invention therefore aims to overcome this drawback of the prior art by providing a more accurate temperature sensor in which the sources of error are reduced.
L'invention concerne un capteur de température pour moteur de véhicule automobile, comprenant :  The invention relates to a temperature sensor for a motor vehicle engine, comprising:
- un thermocouple comportant deux fils métalliques constitués de métaux différents soudés entre eux à une première extrémité formant une soudure chaude pour mesurer une température T1 dans le moteur, lesdits deux fils métalliques comportant chacun une deuxième extrémité,  a thermocouple comprising two metal wires made of different metals welded to each other at a first end forming a hot solder for measuring a temperature T1 in the motor, said two metal wires each having a second end,
- un circuit imprimé comprenant un circuit intégré, ledit circuit intégré comprenant un voltmètre et une sonde de température mesurant une température de référence TO, les fils métalliques du thermocouple étant reliées électriquement à deux bornes respectives du circuit imprimé par deux moyens de liaison électriques respectifs, et  a printed circuit comprising an integrated circuit, said integrated circuit comprising a voltmeter and a temperature probe measuring a reference temperature TO, the metal wires of the thermocouple being electrically connected to two respective terminals of the printed circuit by two respective electrical connection means, and
- un boîtier de protection dans lequel sont logés les deuxièmes extrémités des fils métalliques et le circuit imprimé.  - A protective housing in which are housed the second ends of the metal son and the printed circuit.
Selon l'invention, chacun de ces moyens de liaison électriques est constitué du même métal que celui du fil métallique du thermocouple auquel il est relié, le voltmètre du circuit intégré mesurant la tension entre les deux bornes du circuit imprimé.  According to the invention, each of these electrical connection means is made of the same metal as that of the wire of the thermocouple to which it is connected, the voltmeter of the integrated circuit measuring the voltage between the two terminals of the printed circuit.
Selon un mode de réalisation possible, chaque moyen de liaison électrique comprend un conducteur électrique connecté d'une part à une deuxième extrémité d'un fil métallique du thermocouple et d'autre part à une des bornes du circuit imprimé.  According to a possible embodiment, each electrical connection means comprises an electrical conductor connected on the one hand to a second end of a wire of the thermocouple and on the other hand to one of the terminals of the printed circuit.
Selon un autre mode de réalisation possible, chaque moyen de liaison électrique est formé par un des fils métalliques du thermocouple, chaque deuxième extrémité des fils métalliques se prolongeant jusqu'à une borne du circuit imprimé.  According to another possible embodiment, each electrical connection means is formed by one of the metal son of the thermocouple, each second end of the metal son extending to a terminal of the printed circuit.
Selon un autre mode de réalisation possible, la distance entre les bornes du circuit imprimé et le circuit intégré est inférieure à 6 mm et de préférence inférieure à 2,5 mm.  According to another possible embodiment, the distance between the terminals of the printed circuit and the integrated circuit is less than 6 mm and preferably less than 2.5 mm.
Selon un autre mode de réalisation possible, le thermocouple est de type J, K, T, R, S ou N.  According to another possible embodiment, the thermocouple is of type J, K, T, R, S or N.
Selon un autre mode de réalisation possible, les deux fils métalliques du thermocouple et les deux moyens de liaison électriques sont formés d'un couple de métaux Nisil/Nicrosil. L'invention fournit ainsi un capteur de température plus précis dans lequel les sources d'erreur sont réduites. According to another possible embodiment, the two metal wires of the thermocouple and the two electrical connection means are formed of a pair of Nisil / Nicrosil metals. The invention thus provides a more accurate temperature sensor in which the sources of error are reduced.
La continuité du thermocouple est prolongée jusqu'au circuit imprimé. La soudure froide ou point froid est localisée à l'endroit du circuit imprimé.  The continuity of the thermocouple is extended to the printed circuit. The cold junction or cold spot is located at the printed circuit board.
La distance thermique entre le circuit intégré et le point froid formé des deux deuxièmes extrémités des fils métalliques du thermocouple est réduit.  The thermal distance between the integrated circuit and the cold point formed by the two second ends of the metal wires of the thermocouple is reduced.
En effet, le point de mesure de la tension se situe dans la proximité immédiate du circuit intégré. La forte conductivité thermique du circuit imprimé permet une bonne transmission de la chaleur du point froid vers le circuit intégré et une quasi homogénéité des températures.  Indeed, the point of measurement of the voltage is in the immediate vicinity of the integrated circuit. The high thermal conductivity of the printed circuit allows a good transmission of the heat from the cold point to the integrated circuit and a quasi homogeneity of the temperatures.
L'écart de température entre les deuxièmes extrémités des deux fils métalliques du thermocouple et la sonde de température qui est intégrée dans le circuit intégré mesurant une température de référence T0 est réduit, passant de 4°C ou 5 °C à moins de 1 °C.  The temperature difference between the second ends of the two metal wires of the thermocouple and the temperature probe which is integrated in the integrated circuit measuring a reference temperature T0 is reduced, from 4 ° C or 5 ° C to less than 1 ° vs.
L'invention permet donc d'utiliser la sonde de température déjà intégrée dans le circuit intégré tout en fournissant une erreur sur la température de référence T0 minimale.  The invention thus makes it possible to use the temperature probe already integrated in the integrated circuit while providing an error on the minimum reference temperature T0.
Les caractéristiques de l'invention seront décrites plus en détail en se référant aux dessins annexés dans lesquels :  The features of the invention will be described in more detail with reference to the accompanying drawings in which:
- la figure 1 est une représentation schématique de l'intérieur d'un capteur de température vu de profil selon l'invention. - Figure 1 is a schematic representation of the inside of a temperature sensor seen in profile according to the invention.
La figure 1 représente l'intérieur d'un capteur de température 1 pour moteur de véhicule automobile selon l'invention.  FIG. 1 represents the interior of a temperature sensor 1 for a motor vehicle engine according to the invention.
Le capteur de température 1 comprend un thermocouple 2 comportant deux fils métalliques 3 différents soudés entre eux à une première extrémité formant une soudure chaude pour mesurer une température T1 dans le moteur (non représenté).  The temperature sensor 1 comprises a thermocouple 2 having two different wires 3 welded together at a first end forming a hot weld to measure a temperature T1 in the motor (not shown).
La température T1 correspond à la température du milieu à mesurer. Les fils métalliques 3 sont constitués de deux métaux différents, comme par exemple un couple de métaux Nisil/Nicrosil. Le thermocouple 2 est de type J, K, T, R, S, N, par exemple.  The temperature T1 corresponds to the temperature of the medium to be measured. The metal wires 3 consist of two different metals, for example a pair of Nisil / Nicrosil metals. Thermocouple 2 is of type J, K, T, R, S, N, for example.
Les fils métalliques 3 du thermocouple 2 sont reliés électriquement à deux bornes 1 1 respectives du circuit imprimé 5 par deux moyens de liaison électriques 10 respectifs.  The metal wires 3 of the thermocouple 2 are electrically connected to two respective terminals 1 1 of the printed circuit 5 by two respective electrical connection means 10.
Le capteur de température 1 comprend un circuit imprimé 5 comprenant un circuit intégré 6. Le circuit intégré 6 comprend le voltmètre et une sonde de température mesurant une température de référence T0. Le circuit intégré 6 est un circuit intégré à application spécifique ASIC (Application Spécifie for Integrated Circuit) capable de traiter des signaux de tension pour les convertir en température. Il est capable de fournir un signal de sortie analogique ou numérique et d'utiliser un protocole (« SENT »).  The temperature sensor 1 comprises a printed circuit 5 comprising an integrated circuit 6. The integrated circuit 6 comprises the voltmeter and a temperature sensor measuring a reference temperature T0. The integrated circuit 6 is an application-specific integrated circuit ASIC (Application Specific for Integrated Circuit) capable of processing voltage signals to convert them into temperature. It is able to provide an analog or digital output signal and use a protocol ("SENT").
Les deux fils métalliques 3 du thermocouple 2 comportent chacun une deuxième extrémité 4. Le capteur de température 1 comprend un boîtier de protection 7 en polymère dans lequel sont logés les deuxièmes extrémités 4 des fils métalliques 3 du thermocouple 2 et le circuit imprimé 5. The two metal wires 3 of the thermocouple 2 each comprise a second end 4. The temperature sensor 1 comprises a polymer protective housing 7 in which are housed the second ends 4 of the metal wires 3 of the thermocouple 2 and the printed circuit 5.
Selon l'invention, chacun de ces moyens de liaison électriques 1 0 est constitué du même métal que celui du fil métallique 3 du thermocouple 2 auquel il est relié. Le voltmètre du circuit intégré 6 mesure la tension entre les deux bornes 1 1 du circuit imprimé 5.  According to the invention, each of these electrical connection means 1 0 consists of the same metal as that of the metal wire 3 of the thermocouple 2 to which it is connected. The voltmeter of the integrated circuit 6 measures the voltage between the two terminals 1 1 of the printed circuit 5.
En connaissant la température de référence T0 et la tension au point froid, c'est-à-dire entre les deux bornes 1 1 du circuit imprimé 5, on en déduit la température T1 du point chaud qui correspond à la température du milieu à mesurer dans le moteur du véhicule.  Knowing the reference temperature T0 and the voltage at the cold point, that is to say between the two terminals 1 1 of the printed circuit 5, the temperature T1 of the hot point is deduced, which corresponds to the temperature of the medium to be measured. in the vehicle engine.
Selon un mode de réalisation préféré, chaque moyen de liaison électrique 1 0 comprend un conducteur électrique 1 0 connecté d'une part à une deuxième extrémité 4 d'un fil métallique 3 du thermocouple 2 et d'autre part à une des bornes 1 1 du circuit imprimé 5, comme représenté sur la figure 1 .  According to a preferred embodiment, each electrical connection means 1 0 comprises an electrical conductor 1 0 connected on the one hand to a second end 4 of a metal wire 3 of the thermocouple 2 and on the other hand to one of the terminals 1 1 of the printed circuit 5, as shown in FIG.
Les conducteurs électriques 1 0 sont des éléments distincts des fils métalliques 3 du thermocouple 2 mais constitués respectivement par les mêmes métaux.  The electrical conductors 1 0 are distinct elements of the metal wires 3 of the thermocouple 2 but constituted respectively by the same metals.
La continuité électrique est assurée jusqu'aux bornes 1 1 du circuit imprimé 5. Les deuxièmes extrémités 4 des fils métalliques 3 du thermocouple 2 sont distantes du circuit imprimé 5, comme montré sur la figure 1 .  The electrical continuity is ensured up to the terminals 1 1 of the printed circuit 5. The second ends 4 of the metal wires 3 of the thermocouple 2 are distant from the printed circuit 5, as shown in FIG.
Cependant, le fait que les métaux des fils métalliques 3 du thermocouple 2 et ceux des conducteurs électriques 1 0 soient identiques permet de ramener le point froid ou soudure froide à l'endroit des bornes 1 1 du circuit imprimé 5. Le voltmètre mesure la tension entre les deux bornes 1 1 du circuit imprimé 5.  However, the fact that the metals of the metal wires 3 of the thermocouple 2 and those of the electrical conductors 1 0 are identical makes it possible to bring the cold point or cold junction back to the terminals 1 1 of the printed circuit 5. The voltmeter measures the voltage between the two terminals 1 1 of the printed circuit 5.
Les deuxièmes extrémités 4 des fils métalliques 3 sont disposées en dessous du circuit imprimé 5. Dans le capteur de température, les fils métalliques 3 et le circuit imprimé 5 sont sensiblement parallèles.  The second ends 4 of the metal wires 3 are arranged below the printed circuit 5. In the temperature sensor, the metal wires 3 and the printed circuit 5 are substantially parallel.
Les deuxièmes extrémités 4 des fils métalliques 3 du thermocouple 2 sont solidaires d'un premier connecteur 14 connecté au boîtier de protection 7.  The second ends 4 of the metal wires 3 of the thermocouple 2 are integral with a first connector 14 connected to the protective housing 7.
Les deuxièmes extrémités 4 des fils métalliques 3 du thermocouple 2 sont connectées électriquement aux deux conducteurs électriques 1 0 par soudure ou sertissage, par exemple.  The second ends 4 of the metal wires 3 of the thermocouple 2 are electrically connected to the two electrical conductors 10 by welding or crimping, for example.
Les deux conducteurs électriques 10 sont soudés aux deux bornes 1 1 du circuit imprimé 5. Sur la figure 1 , les deux bornes 1 1 traversent le circuit imprimé 5 et font saillie sur les deux faces 9a, 9b du circuit imprimé 5.  The two electrical conductors 10 are soldered to the two terminals 1 1 of the printed circuit 5. In FIG. 1, the two terminals 1 1 pass through the printed circuit 5 and project on the two faces 9a, 9b of the printed circuit 5.
Le boîtier de protection 7 comprend deux compartiments 1 2, 1 3 séparés par le circuit imprimé 5 dont un premier compartiment 1 2 dans lequel sont logés les deuxièmes extrémités 4 des fils métalliques 3 du thermocouple 2 ainsi que les moyens de liaison électriques 1 0 et un deuxième compartiment 13 opposé.  The protective housing 7 comprises two compartments 1 2, 1 3 separated by the printed circuit 5, a first compartment 1 2 in which are housed the second ends 4 of the metal wires 3 of the thermocouple 2 and the electrical connection means 1 0 and a second compartment 13 opposite.
Le capteur de température 1 comprend également un deuxième connecteur 1 9 pour le relier électriquement à un dispositif électronique (non représenté). Des deuxièmes bornes de connexions 20 sont prévues ainsi que des fils électriques 21 pour relier le circuit imprimé 5 au deuxième connecteur 1 9. The temperature sensor 1 also includes a second connector 19 for electrically connecting it to an electronic device (not shown). of the second connection terminals 20 are provided as well as electrical wires 21 for connecting the printed circuit 5 to the second connector 1 9.
Le circuit imprimé 5 comprend une première surface 9a qui se situe du côté des deuxièmes extrémités 4 des deux fils métalliques 3 du thermocouple 2 et une deuxième surface 9b opposée délimitant le deuxième compartiment 13 du boîtier de protection 7.  The printed circuit 5 comprises a first surface 9a which is located on the side of the second ends 4 of the two metal wires 3 of the thermocouple 2 and a second opposite surface 9b delimiting the second compartment 13 of the protective housing 7.
De préférence, le circuit intégré 6 est placé sur la première surface 9a du circuit imprimé 5 du côté des moyens de liaison électriques 1 0.  Preferably, the integrated circuit 6 is placed on the first surface 9a of the printed circuit 5 on the side of the electrical connection means 1 0.
Alternativement mais de manière moins avantageuse, le circuit intégré 6 est placé sur la deuxième surface 9b du circuit imprimé 5.  Alternatively, but less advantageously, the integrated circuit 6 is placed on the second surface 9b of the printed circuit 5.
Le circuit intégré 6 étant placé sur la première surface 9a du circuit imprimé 5, la distance entre les bornes 1 1 du circuit imprimé 5 faisant saillie sur cette surface première surface 9a et le circuit intégré 6 est inférieure à 6 mm et est de préférence inférieure à 2,5 mm.  As the integrated circuit 6 is placed on the first surface 9a of the printed circuit 5, the distance between the terminals 1 1 of the printed circuit 5 protruding from this first surface surface 9a and the integrated circuit 6 is less than 6 mm and is preferably smaller. at 2.5 mm.
Une partie des calories provenant des deux conducteurs électriques 10 est transmise aux bornes 1 1 du circuit imprimé 5. Plus la distance entre les bornes 1 1 et le circuit intégré 6 est faible et plus la résistance thermique est faible. Le circuit imprimé 5 est un bon conducteur thermique. Il transmet les calories des bornes 1 1 du circuit imprimé 5 jusqu'au circuit intégré 6 comprenant la sonde de température mesurant la température de référence T0.  Part of the calories from the two electrical conductors 10 is transmitted to the terminals 1 1 of the printed circuit 5. The smaller the distance between the terminals 1 1 and the integrated circuit 6, the lower the thermal resistance is. The printed circuit 5 is a good thermal conductor. It transmits the calories from the terminals 1 1 of the printed circuit 5 to the integrated circuit 6 comprising the temperature sensor measuring the reference temperature T0.
Les pertes thermiques sont ainsi réduites. L'écart de température entre les deuxièmes extrémités 4 des deux fils métalliques 3 du thermocouple 2 et la sonde de température mesurant la température de référence T0 est réduit, passant de 4°C ou 5 °C à moins de 1 °C.  Thermal losses are thus reduced. The temperature difference between the second ends 4 of the two metal wires 3 of the thermocouple 2 and the temperature probe measuring the reference temperature T0 is reduced, from 4 ° C. or 5 ° C. to less than 1 ° C.
Selon un autre mode de réalisation possible, chaque moyen de liaison électrique 1 0 est formé par un des fils métalliques 3 du thermocouple 2. Chaque deuxième extrémité 4 des fils métalliques 3 se prolonge jusqu'à l'une des bornes 1 1 du circuit imprimé 5.  According to another possible embodiment, each electrical connection means 1 0 is formed by one of the metal wires 3 of the thermocouple 2. Each second end 4 of the metal wires 3 extends to one of the terminals 1 1 of the printed circuit 5.
Autrement dit, les deux fils métalliques 3 du thermocouple 2 se prolongent directement jusqu'aux bornes 1 1 du circuit imprimé 5.  In other words, the two metal wires 3 of the thermocouple 2 extend directly to the terminals 1 1 of the printed circuit 5.
Les deux fils métalliques 3 du thermocouple 2 sont soudés directement aux bornes 1 1 du circuit imprimé 5.  The two metal wires 3 of the thermocouple 2 are soldered directly to the terminals 1 1 of the printed circuit 5.
Les fils métalliques 3 du thermocouple 2 étant constitués de plusieurs fils métalliques très fins difficiles à souder sur les bornes 1 1 du circuit imprimé 5, le mode de réalisation utilisant un conducteur électrique 1 0 distinct des fils métalliques 3 du thermocouple 2 est préféré au mode de réalisation décrit ci-dessus.  The metal wires 3 of the thermocouple 2 being made up of several very thin metal wires which are difficult to weld on the terminals 1 1 of the printed circuit 5, the embodiment using an electrical conductor 10 distinct from the metal wires 3 of the thermocouple 2 is preferred over the embodiment described above.

Claims

REVENDICATIONS
1 . Capteur de température (1 ) pour moteur de véhicule automobile, comprenant : 1. Temperature sensor (1) for a motor vehicle engine, comprising:
- un thermocouple (2) comportant deux fils métalliques (3) constitués de métaux différents soudés entre eux à une première extrémité formant une soudure chaude pour mesurer une température T1 dans le moteur, lesdits deux fils métalliques (3) comportant chacun une deuxième extrémité (4), - a thermocouple (2) comprising two metal wires (3) made of different metals welded together at a first end forming a hot weld to measure a temperature T1 in the engine, said two metal wires (3) each having a second end ( 4),
- un circuit imprimé (5) comprenant un circuit intégré (6), ledit circuit intégré (5) comprenant un voltmètre et une sonde de température mesurant une température de référence T0, les fils métalliques (3) du thermocouple (2) étant reliés électriquement à deux bornes (1 1 ) respectives du circuit imprimé (5) par deux moyens de liaison électriques (1 0) respectifs,  a printed circuit (5) comprising an integrated circuit (6), said integrated circuit (5) comprising a voltmeter and a temperature probe measuring a reference temperature T0, the metal wires (3) of the thermocouple (2) being electrically connected with two respective terminals (1 1) of the printed circuit (5) by two respective electrical connection means (1 0),
- un boîtier de protection (7) dans lequel sont logés les deuxièmes extrémités (4) des fils métalliques (3) et le circuit imprimé (5), caractérisé en ce que :  - a protective housing (7) in which are housed the second ends (4) of the metal wires (3) and the printed circuit (5), characterized in that:
- chacun de ces moyens de liaison électriques (1 0) est constitué du même métal que celui du fil métallique (3) du thermocouple (2) auquel il est relié. each of these electrical connection means (1 0) consists of the same metal as that of the wire (3) of the thermocouple (2) to which it is connected.
2. Capteur de température (1 ) selon la revendication 1 , caractérisé en ce que chaque moyen de liaison électrique (1 0) comprend un conducteur électrique (1 0) connecté d'une part à une deuxième extrémité (4) d'un fil métallique (3) du thermocouple (2) et d'autre part à une des bornes (1 1 ) du circuit imprimé (5). 2. Temperature sensor (1) according to claim 1, characterized in that each electrical connection means (1 0) comprises an electrical conductor (1 0) connected on the one hand to a second end (4) of a wire metal (3) of the thermocouple (2) and on the other hand to one of the terminals (1 1) of the printed circuit (5).
3. Capteur de température (1 ) selon la revendication 1 , caractérisé en ce que chaque moyen de liaison électrique (1 0) est formé par un des fils métalliques (3) du thermocouple (2), chaque deuxième extrémité (4) des fils métalliques (3) se prolongeant jusqu'à une borne (1 1 ) du circuit imprimé (5). 3. Temperature sensor (1) according to claim 1, characterized in that each electrical connection means (1 0) is formed by one of the metal wires (3) of the thermocouple (2), each second end (4) of the wires. metallic (3) extending to a terminal (1 1) of the printed circuit (5).
4. Capteur de température (1 ) selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la distance entre les bornes (1 1 ) du circuit imprimé (5) et le circuit intégré (6) est inférieure à 6 mm et de préférence inférieure à 2,5 mm. 4. Temperature sensor (1) according to any one of claims 1 to 3, characterized in that the distance between the terminals (1 1) of the printed circuit (5) and the integrated circuit (6) is less than 6 mm and preferably less than 2.5 mm.
5. Capteur de température (1 ) selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le thermocouple (2) est de type J, K, T, R, S ou N. 5. Temperature sensor (1) according to any one of claims 1 to 4, characterized in that the thermocouple (2) is J, K, T, R, S or N.
6. Capteur de température (1 ) selon la revendication 5, caractérisé en ce que les deux fils métalliques (3) du thermocouple (2) et les deux moyens de liaison électriques (1 0) sont formés d'un couple de métaux Nisil/Nicrosil. 6. Temperature sensor (1) according to claim 5, characterized in that the two metal wires (3) of the thermocouple (2) and the two electrical connection means (1 0) are formed of a pair of metals Nisil / Nicrosil.
PCT/FR2016/052754 2015-10-22 2016-10-24 Motor-vehicle temperature sensor comprising a thermocouple WO2017068307A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112016004846.7T DE112016004846T5 (en) 2015-10-22 2016-10-24 Temperature sensor for a motor vehicle, comprising a thermocouple

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1560082 2015-10-22
FR1560082A FR3042862B1 (en) 2015-10-22 2015-10-22 TEMPERATURE SENSOR FOR A MOTOR VEHICLE COMPRISING A THERMOCOUPLE

Publications (1)

Publication Number Publication Date
WO2017068307A1 true WO2017068307A1 (en) 2017-04-27

Family

ID=55752345

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR2016/052754 WO2017068307A1 (en) 2015-10-22 2016-10-24 Motor-vehicle temperature sensor comprising a thermocouple

Country Status (3)

Country Link
DE (1) DE112016004846T5 (en)
FR (1) FR3042862B1 (en)
WO (1) WO2017068307A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3872465A1 (en) 2020-02-25 2021-09-01 Hidria d.o.o. Temperature sensor and a method of manufacturing a temperature sensor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3066818B1 (en) * 2017-05-29 2021-06-25 Sc2N Sa MOTOR VEHICLE TEMPERATURE SENSOR INCLUDING AN N-TYPE THERMOCOUPLE

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2321712A (en) * 1997-01-31 1998-08-05 Omega Engineering Thermoelectric compensation and linearization device
US6377180B1 (en) * 1999-07-22 2002-04-23 Webasto Thermosysteme International Gmbh Circuit for evaluating thermocouple measurement signals
US20120008662A1 (en) * 2010-07-06 2012-01-12 David Phillip Gardiner Method and Apparatus for Measurement of Temperature and Rate of Change of Temperature

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2321712A (en) * 1997-01-31 1998-08-05 Omega Engineering Thermoelectric compensation and linearization device
US6377180B1 (en) * 1999-07-22 2002-04-23 Webasto Thermosysteme International Gmbh Circuit for evaluating thermocouple measurement signals
US20120008662A1 (en) * 2010-07-06 2012-01-12 David Phillip Gardiner Method and Apparatus for Measurement of Temperature and Rate of Change of Temperature

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3872465A1 (en) 2020-02-25 2021-09-01 Hidria d.o.o. Temperature sensor and a method of manufacturing a temperature sensor

Also Published As

Publication number Publication date
FR3042862B1 (en) 2019-07-26
FR3042862A1 (en) 2017-04-28
DE112016004846T5 (en) 2018-06-28

Similar Documents

Publication Publication Date Title
EP1676140B1 (en) Device for non-dissipative measurement of current in an inductive resistor
FR2488406A1 (en) CORROSION MEASUREMENT METHOD AND INSTRUMENT WITH SECONDARY TEMPERATURE COMPENSATION
EP1107009A1 (en) Current intensity measuring apparatus in a conductor
FR3042862B1 (en) TEMPERATURE SENSOR FOR A MOTOR VEHICLE COMPRISING A THERMOCOUPLE
CN101614599B (en) A method and circuit for estimating the temperature in an internal combustion engine
EP1387155A1 (en) Miniature connector with embedded electronics for thermocouple
FR2579036A1 (en) ELECTRONIC VOLTAGE REGULATION DEVICE TAKING ACCOUNT OF THERMAL DISSIPATION, ESPECIALLY FOR ALTERNATORS
FR3042861A1 (en) TEMPERATURE SENSOR FOR A MOTOR VEHICLE COMPRISING A THERMOCOUPLE
FR3043200A1 (en) TEMPERATURE SENSOR FOR A MOTOR VEHICLE COMPRISING A THERMOCOUPLE AND METHOD FOR MANUFACTURING THE SAME
Gierth et al. Novel thermocouples for automotive applications
EP0557225B1 (en) Thermocouple cold junction compensating device
EP2312327B1 (en) Method and device for measuring the electric current supplied by a high-voltage line to a railway vehicle
WO2018220304A1 (en) Temperature sensor for motor vehicle comprising a type-n thermocouple
EP1462783A1 (en) Apparatus for and method of calibrating a resistance thermometer and a gas analyser employing the same
EP1862782A1 (en) Resistive probe of a sensor for detecting the level of a liquid
WO2018002545A1 (en) Sensor for an intake air manifold, comprising a thermocouple
EP1810041B1 (en) Battery sensor device
FR2706610A1 (en) Heat flow sensor and associated measuring device
WO2014125220A1 (en) Measurement of the homogeneous temperature of a coil by increasing the resistance of a wire
FR3066018A1 (en) MULTI-PROBE HIGH TEMPERATURE SENSOR
FR3065282B1 (en) SENSOR FOR INTAKE AIR DISTRIBUTOR WITH REDUNDANCY FUNCTION
FR3045819A1 (en) METHOD FOR MANUFACTURING A TEMPERATURE SENSOR COMPRISING A THERMOCOUPLE AND METHOD OF USE
CN212963724U (en) Infrared sensor and electronic device
WO2016198812A1 (en) Temperature and pressure sensor
FR2676276A1 (en) DEVICE FOR SENSING SENSOR SIGNALS.

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16798250

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 112016004846

Country of ref document: DE

122 Ep: pct application non-entry in european phase

Ref document number: 16798250

Country of ref document: EP

Kind code of ref document: A1