EP3058379A1 - Procédé de mesure d'une température - Google Patents

Procédé de mesure d'une température

Info

Publication number
EP3058379A1
EP3058379A1 EP14781252.3A EP14781252A EP3058379A1 EP 3058379 A1 EP3058379 A1 EP 3058379A1 EP 14781252 A EP14781252 A EP 14781252A EP 3058379 A1 EP3058379 A1 EP 3058379A1
Authority
EP
European Patent Office
Prior art keywords
temperature
voltage drop
electrically conductive
conductive material
current
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.)
Withdrawn
Application number
EP14781252.3A
Other languages
German (de)
English (en)
Inventor
Wolfgang Jöckel
Jens HERCHENRÖDER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Teves AG and Co OHG
Original Assignee
Continental Teves AG and Co OHG
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 Continental Teves AG and Co OHG filed Critical Continental Teves AG and Co OHG
Publication of EP3058379A1 publication Critical patent/EP3058379A1/fr
Withdrawn legal-status Critical Current

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
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements

Definitions

  • the invention relates to a method for measuring a temperature in a current sensor.
  • Electric currents in and out of a vehicle battery to be measured for example, in DE 10 2005 039 587 Al with a current ⁇ sensor in which a sensing element Manganin is welded between two terminals acting as contact resistance of copper.
  • a method of measuring a temperature in a current sensor comprising a first electrically conductive material and a second electrically conductive material connected in series with the first electrically conductive material, both of which are flowed through by an electrical current, comprising:
  • the specified method is based on the consideration that current sensors, in particular, if they are used for measuring electric currents in or from a vehicle battery, as mentioned above, in the electric power path of the Batteries are interconnected.
  • the current ⁇ sensors with a so-called ohm see 'shunt or measurement shunt, hereinafter referred to as measuring element be constructed of which the current to be measured is determined from the induced at the measuring shunt by the current to be measured voltage drop in the frame, this interconnection can to power path lead to clearly noticeable negative side effects due to the occurring high electrical currents and the associated power loss.
  • the main reason is that the measuring element can become very hot due to the high currents that occur and thus to the resulting power loss.
  • the heat generated by the power loss affects the measurement accuracy of the entire measuring chain, which typically includes the measuring element, an amplifier and an analog / digital converter.
  • the measuring terminals for detecting the voltage drop across the measuring element as close as possible to the measuring element, but the success of this measure is extremely limited.
  • the temperature in the current sensor could be measured. This would make it possible, by suitable compensation methods, such as cooling, emergency shutdown, Regulation of the circuit or even computational compensation of the measurement results to compensate for the deviations occurring.
  • the temperature detection could be done directly (at current sensor) or indirectly (in the vicinity of the current sensor) placed by a temperature sensor, it would j edoch the required item expense, especially in the mass production ⁇ increase noticeably.
  • the direct temperature measurement would be realized only with a very high cost, even if it would be relatively more reliable than the indirect temperature measurement.
  • the loss ⁇ performance could be detected and used as a basis for the aforementioned compensation.
  • the accuracy of the compensation is very low. This is where the specified method, based on the consideration that changes its electrical resistance in the measuring element depending on the temperature. In other words, by detecting the electrical resistance of the measuring element and thus of the first electrically conductive material, the temperature could be determined directly.
  • Measuring element not the electrical resistance but the voltage drop is detected, in addition to the tempera ⁇ turtwo changing electrical resistance and the electrical current to be detected is included.
  • any, that is also an extra electric current can be used for the temperature detection.
  • Particularly expedient ⁇ FLOWING manner al electric current to be measured by the current sensor electric power used (and eliminated subsequently by the juxtaposition), because in this way no further additional electrical elements such as an own power source must be used.
  • the first electrically conductive material and the second electrically conductive material, on which the voltage drops are measured can be integrated into any electrical elements.
  • the material of the measuring element, that is to say of the measuring shunt, at which the measuring voltage drops which depends on the current of the current sensor to be measured is particularly expediently selected as the first electrically conductive material.
  • the already existing in the current sensor for current measurement structure for measuring the temperature can be fully used with.
  • a Be ⁇ reference potential is necessary is known, which is applied in a particularly advantageous development of the measuring shunt, as a further measuring point at a position with the second electrically conductive material is only necessary in this way.
  • the first and second electrically conductive materials are to be interpreted broadly below. It is only important that there is a difference between the two materials. It may therefore be in principle to the same types of material, the difference may be, for example, in the length of the material or in the volume of the two materials.
  • the current sensor has at least one circuit connection for supplying or discharging the current to be measured with the second electrically conductive material which is connected to the measuring shunt.
  • the second electrically conductive material different from the first electrically conductive material, only a few additional electrical lines need to be electrically contacted, for example, by bonding, soldering or conductive bonding to implement the specified method. From all the information thus obtained, the temperature can then be evaluated with a suitable signal processing device.
  • a quotient of the two voltage drops is formed in the context of another development of the specified method for facing the first voltage drop and the second voltage drop.
  • This refinement is based on the consideration that the detected voltage drops in the context of the ohmic law are composed of a quotient of the electric current to be detected and the electrical resistance entering into the respective detected voltage drop.
  • the electric current is basically the same for both voltage drops, so that it can be shortened within the scope of the aforementioned quotient formation.
  • the quotient thus formed can be assigned a unique temperature as a temperature to be measured in a characteristic curve.
  • a characteristic can be stored programmatically in a simple manner in a memory and retrieved, if necessary, without much computational effort.
  • the unique temperature can be determined in advance experimentally, for example by means of test series.
  • a control device is set up to carry out a method according to one of the preceding claims.
  • the specified device has a memory and a processor.
  • the specified method is stored in the form of a Compu ⁇ terprogramms in the memory and the processor is provided for performing the method when the computer program from the memory is loaded into the processor.
  • a computer program comprises program code means for performing all the steps of one of the specified methods when the computer program is executed on a computer or one of the specified devices.
  • a computer program product comprises a program code which is stored on a data carrier and the compu ⁇ terlesbaren, when executed on a data processing device, carries out one of the methods specified.
  • a current sensor comprises a specified controller.
  • a vehicle includes a specified controller.
  • Fig. 1 is a schematic diagram of a vehicle with an electric drive
  • Fig. 2 is a schematic diagram of a current sensor of the vehicle of Fig. 1
  • Fig. 3 is a circuit diagram of the current sensor of Fig. 2;
  • Fig. 4 shows changes in the current measurement results of the current sensor of Figure 3 over the temperature.
  • Fig. 5 shows temperature measurement results of the current sensor of Fig. 3.
  • Fig. 1 shows a schematic diagram of a vehicle 2 with an electric drive 4.
  • the vehicle 2 is intended to have, for example, a front-wheel drive in which the electric drive 4 comprises an electric motor 6 which drives the front wheels 10 of the vehicle 2 via a drive shaft 8.
  • the rear wheels 12 of the vehicle 2 are therefore free-wheeling wheels.
  • the electric motor 6 of the electric drive 4 is supplied in the present embodiment via an electrical converter 14 in a manner known per se from a vehicle battery 16 with electrical energy 18.
  • the vehicle battery 16 emits an electrical current 20, which is then converted by the converter 14, controlled by a control device designed as a motor controller 22, into the electrical energy 18 suitable for driving the electric motor 6.
  • the motor controller 22 controls the converter 14 with known control signals.
  • an ambient temperature 26 around the current sensor 24 should also be detected.
  • the current sensor 24 outputs a first voltage value 28 and a second voltage value 30, which will be explained in more detail below with reference to FIGS. 2 and 3, in which the current sensor 24 is shown in a schematic representation and as a circuit diagram.
  • the current sensor 24 has as a measuring element a measuring shunt 32 made of a first electrically conductive material which can be electrically integrated into the electric drive 4 of FIG. 1 via two connecting elements 34 made of a second electrically conductive material.
  • the first electrically conductive material of the measuring shunt 32 may, for example, comprise manganin and be welded to the two connection elements 34, for example.
  • the second electrically conductive material of the two connection elements 34 may comprise copper, for example.
  • the two connection ⁇ elements 34 thus form a contact resistance between the rest of the circuit elements of the electric drive 4 and the measuring shunt 32nd
  • the current sensor 24 For measuring the electric current 20, the current sensor 24 has a first electrical connection 36 and a second electrical connection 38, viewed in the direction of the electrical current 20 corresponding to a first electrical potential 40 in front of the measuring shunt 32 and a second electrical potential 42 after Measuring shunt 32 can be detected.
  • the two detected electrical potentials 40, 42 are supplied to a first differential amplifier 44 in the present embodiment.
  • the first differential amplifier 44 subtracts the two electrical potentials 40, 42 vonei ⁇ Nander and so calculates the first voltage drop 28, which thus drops across the measuring shunt 32nd Based on the first Voltage drop 28 so that the electric current 20 can be determined.
  • the temperature 26 in the vicinity of the current sensor 24 should also be determined.
  • the current sensor 24 has a third electrical connection 46, which in the present embodiment, viewed in the direction of the electrical current 20, is applied to the connection element 34 after the measuring shunt 32.
  • a third electrical Po ⁇ tential 48 is detected, which is supplied together with the first electric potential 40 a second differential amplifier 50, which measures by subtraction of the two potentials 40, 48 the second voltage drop 30th
  • the second voltage drop 30 thus comprises a voltage which drops across the measuring shunt 32 and a part of the connecting element 34, which, viewed in the direction of the electrical current 20, is arranged after the measuring shunt 32.
  • the temperature can be determined by the current sensor 26 24th
  • the following table of measured values will be considered below:
  • the table consists of three subtables in the column direction. Here are in the first three columns for different values of the electrical current to be measured 20, the development of the first voltage drop 28 on the tempera ⁇ temperature 26 applied. In the second three columns of the development of the second voltage drop 30 are applied over the Tempe ⁇ temperature 26 for different values of the measured electric current 20th The development of the ratio between the first voltage drop 28 and the second voltage drop 30 across the temperature 26 is plotted in the last three columns for various values of the electric current 20 to be measured.
  • the deviations 52 of the first voltage drop 28 and of the second voltage drop 30 from a fixed reference point 54 are plotted against the temperature 26 in FIG. 4.
  • this reference point 54 was selected at a temperature 26 of 25 ° C.
  • the deviations 52 of the voltage drops 28, 30 are independent of the electric current 20 which flows through the current sensor 24, so that only the
  • Deviations out the temperature 26 could be determined. However, for real use, a predetermined reference point 54 would have to be measured at any time, from which the deviations 52 can be determined. However, depending on the application, this may not be possible or at least very time-consuming. In vehicle technology, for example, extreme temperature fluctuations can occur. Thus, in a vehicle, temperatures of 40 ° C to 50 ° C in the summer compared to -20 ° C to -10 ° C in winter can be expected. Serious problems could arise here if the reference temperature of 25 ° C had to be passed first to measure the temperature. In addition, the further problem would be to detect when the 25 ° C are reached, because the use of a temperature sensor should be obsolete. However, upon closer inspection of FIG.
  • the distance 56 between the deviations 52 of the first voltage drop 28 and the deviations 52 of the second voltage drop 30 across the temperature 26 is considered Temperature-dependent course has. If the distance 56 between the deviations 52 of the first voltage drop 28 and the second voltage drop 30 is therefore known, the temperature 26 to be measured can be determined unambiguously. Furthermore, in contrast to the voltage drops 28, 30, this distance 56 is independent of the current 20 to be measured.
  • a measure of the distance 56 can be determined by any counter ⁇ transfer of the first voltage drop 28 and the second voltage drop 30.
  • the quotient 58 between the first voltage drop 28 and the second voltage drop 30 has been exemplified in the above table. It can clearly be seen that the individual quotients 58 of the current 20 to be measured are not independent of the temperature 26 to be measured. Therefore, by the quotient formation between the first voltage drop 28 and the second voltage drop 30, the temperature to be measured 26 can be determined uniquely. The course of the quotient 58 over the temperature 26 is exemplified for the values of the above table in FIG.
  • Characteristic curve 60 could be playing at ⁇ by detecting a measured value table, as recorded, the table shown above in advance and then stored in a not shown memory of the engine controller 22 in FIG. 1. If the motor controller 22 then receives the two voltage drops 28, 30 in the manner shown in FIG. 1, it can determine the temperature 26 by forming the quotient of the two voltage drops 28, 30 and by means of the characteristic curve 60.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

L'invention concerne un procédé de mesure de la température (26) d'un capteur de courant (24) qui comprend un premier matériau électroconducteur (32) et un deuxième matériau électroconducteur (34) monté en série par rapport au premier matériau électroconducteur (32), les deux matériaux pouvant être traversés (20) par un courant électrique. Le procédé comprend les étapes suivantes : la détection d'un potentiel de référence (40) sur le premier ou le deuxième matériau électroconducteur (32, 34) à partir d'une première baisse de tension (30) sur le premier matériau électroconducteur (32) ; la détection, de préférence à partir du potentiel de référence (40), d'une deuxième baisse de tension (30) sur le deuxième matériau électroconducteur (34) ; et la détermination de la température (26) sur la base d'une comparaison entre (58) la première baisse de tension (28) et la deuxième baisse de tension (30).
EP14781252.3A 2013-10-18 2014-10-08 Procédé de mesure d'une température Withdrawn EP3058379A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201310221210 DE102013221210A1 (de) 2013-10-18 2013-10-18 Verfahren zum Messen einer Temperatur
PCT/EP2014/071585 WO2015055483A1 (fr) 2013-10-18 2014-10-08 Procédé de mesure d'une température

Publications (1)

Publication Number Publication Date
EP3058379A1 true EP3058379A1 (fr) 2016-08-24

Family

ID=51662143

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14781252.3A Withdrawn EP3058379A1 (fr) 2013-10-18 2014-10-08 Procédé de mesure d'une température

Country Status (4)

Country Link
EP (1) EP3058379A1 (fr)
CN (1) CN105899956A (fr)
DE (1) DE102013221210A1 (fr)
WO (1) WO2015055483A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109100043A (zh) * 2018-08-21 2018-12-28 西北工业大学 一种用于热-电-力耦合测试系统中的试件温度测量方法
DE102019101408B3 (de) * 2019-01-21 2020-06-18 Infineon Technologies Ag Strommesseinrichtung, Strommessverfahren und Kalibrierungsverfahren
DE102022201996B3 (de) 2022-02-25 2023-07-13 Bruker Biospin Gmbh Verfahren zur Bestimmung eines elektrischen Stromes mit einer Shuntanordnung, mit Kompensation von durch den Strom erzeugter Erwärmung in der Shuntanordnung

Citations (1)

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DE102006001874A1 (de) * 2006-01-13 2007-07-19 Infineon Technologies Ag Verfahren und Vorrichtung zur Strom- und Temperaturmessung in einer leistungselektronischen Schaltung

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JPS5828539B2 (ja) * 1978-06-09 1983-06-16 セイコーインスツルメンツ株式会社 温度検出装置
JP2508929B2 (ja) * 1991-03-15 1996-06-19 船井電機株式会社 加熱調理装置における測温回路
DE19757258C2 (de) * 1997-12-23 2001-02-08 Heraeus Electro Nite Int Sensor mit temperaturabhängigem Meßwiderstand und dessen Verwendung zur Temperaturmessung
DE19841202C1 (de) * 1998-09-09 2000-03-02 Siemens Ag Temperatursensor
JP2000258257A (ja) * 1999-03-04 2000-09-22 Nec Ic Microcomput Syst Ltd 温度判定方法および装置
CN2493938Y (zh) * 2001-08-09 2002-05-29 赵锋 磁光式电流互感器
DE102004046275B4 (de) * 2003-09-23 2006-12-21 Saxotec Gmbh & Co.Kg Vorrichtung zur Überwachung der Temperatur von Hochspannung führenden Baugruppen
DE102005039587A1 (de) 2005-08-19 2007-02-22 Robert Bosch Gmbh Batteriesensoreinheit
US20110089931A1 (en) * 2009-10-19 2011-04-21 Nemic-Lambda Ltd. Temperature-compensated shunt current measurement
US8727616B2 (en) * 2010-04-19 2014-05-20 Fairchild Semiconductor Corporation Differential thermistor circuit
DE102010028086A1 (de) * 2010-04-22 2011-10-27 Robert Bosch Gmbh Verfahren zum Messen eines Stromes und einer Temperatur in einem Kraftfahrzeug

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Title
See also references of WO2015055483A1 *

Also Published As

Publication number Publication date
WO2015055483A1 (fr) 2015-04-23
DE102013221210A1 (de) 2015-04-23
CN105899956A (zh) 2016-08-24

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