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WO2005111642A1 - Procede et dispositif de determination du contenu d'energie d'un accumulateur d'energie - Google Patents

Procede et dispositif de determination du contenu d'energie d'un accumulateur d'energie Download PDF

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Publication number
WO2005111642A1
WO2005111642A1 PCT/EP2005/004831 EP2005004831W WO2005111642A1 WO 2005111642 A1 WO2005111642 A1 WO 2005111642A1 EP 2005004831 W EP2005004831 W EP 2005004831W WO 2005111642 A1 WO2005111642 A1 WO 2005111642A1
Authority
WO
WIPO (PCT)
Prior art keywords
energy
ocv measurement
current
energy store
ocv
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.)
Ceased
Application number
PCT/EP2005/004831
Other languages
German (de)
English (en)
Inventor
Matthias Holz
Michael Zillmer
Ekkehard Pott
David Prochazka
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.)
Skoda Auto AS
Volkswagen AG
Original Assignee
Skoda Auto AS
Volkswagen AG
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 Skoda Auto AS, Volkswagen AG filed Critical Skoda Auto AS
Publication of WO2005111642A1 publication Critical patent/WO2005111642A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3828—Arrangements for monitoring battery or accumulator variables, e.g. SoC using current integration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/3644—Constructional arrangements
    • G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm

Definitions

  • the invention relates to a method and a device for determining the energy content of an energy store.
  • Known methods for determining the energy store are based on a current or voltage measurement at the battery terminals.
  • current measurement the proportion of the charge withdrawn or supplied to the nominal capacity is determined by integrating the battery current over time. If the pure current measurement is additionally linked to a voltage measurement at the battery terminals, a dependence of the energy content on the discharge power P can also be taken into account. With both methods, additional influences such as the age of the battery, self-discharge and battery temperature can be taken into account using appropriate calculation methods.
  • the amount of charge that can be drawn has a pronounced dependence on the discharge current.
  • the discharge capacity decreases with increasing discharge current (Peukert behavior).
  • the terminal voltage of the battery drops with increasing depth of discharge.
  • the voltage drop across the internal resistance of the battery increases, which further reduces the terminal voltage and thus leads to an inaccurate determination of the energy content.
  • a determination of the energy content via the capacitance thus contains a systematic error, since only the capacitance is taken into account, but not the dependence of the voltage profile on various influences.
  • the energy content is therefore determined in normal driving by current integration over time and is corrected by an additional OCV (open-current-voltage) measurement of the battery terminal voltage when the battery is idle.
  • OCV open-current-voltage
  • An OCV measurement when the vehicle is stationary or deactivated also creates the possibility of adapting influences such as self-discharge or battery temperature in time-discrete steps. This subsequently compensates for the current integration error during driving.
  • the disadvantage here is that the measured energy content can differ significantly from the actual energy content during operation.
  • BESTATIGUNGSKOPIE The invention is therefore based on the technical problem of creating a method and a device for improved determination of the energy content of an energy store.
  • the energy store is switched to a currentless state or a state with low charging or discharging power during driving operation and an OCV measurement is carried out after a waiting period, the energy content determined by the OCV measurement being used to correct the value on the basis of the current integration , In this way, the determination of the energy content of an energy store during driving operation can be significantly improved.
  • de-energized is also understood to mean a state in which there is a low current flow as long as it is only ensured that the energy store has settled virtually statically.
  • the waiting time also serves for this purpose, which is preferably chosen between 10-300 s, further preferably between 20-120 s.
  • the energy store is galvanically decoupled, so that a “real” OCV measurement is carried out.
  • the energy supply to the on-board electrical system must be taken over by another energy store, for example a storage capacitor, for the measurement time.
  • another energy store for example a storage capacitor
  • the OCV measurement is carried out depending on the operating situation. For example, data from other vehicle assistance systems can be used. If the device recognizes, for example on the basis of the data from a navigation device, that a longer motorway trip can be expected, the OCV measurement can be carried out during this time, since the generator-driven electric machine generates sufficient energy.
  • the length of the waiting time is selected as a function of the temperature of the energy store. This takes into account the fact that the necessary compensation processes in the energy store take place more slowly at lower temperatures.
  • a charge factor is determined on the basis of the deviation between the values of the energy content after the current integration and the OCV measurement, which is used as a correction factor in the subsequent current integration.
  • the charging factor is increased by a freely applicable value. Similarly, if a lower energy content is determined by the OCV measurement, the charging factor is reduced by a freely applicable value. As a result, the energy content determination is continuously corrected even without OCV measurement during longer operating phases.
  • the energy store is preferably designed as a battery.
  • Fig. 1 is a schematic block diagram of a device for determining the energy content of an energy store
  • the energy supply system 1 shows a part of the electrical energy supply system of a hybrid vehicle, the invention being not restricted to a hybrid vehicle, but being a preferred area of application.
  • the energy supply system 1 comprises an internal combustion engine 2, an electric machine 3, a capacitor 4, a battery 5, an ammeter 6 with an associated integrator 7, a voltmeter 8, a switch 9, a DC / DC converter 10, a control unit 11 and a display and / or storage unit 12.
  • the internal combustion engine 2 can be started by the electric machine 3 in motor operation, or the started internal combustion engine 2 can drive the electric machine 3 as a generator. Furthermore, an operation is possible where both the internal combustion engine and the electric machine 3 drive a transmission (not shown) by motor.
  • the electrical machine 3 is electrically connected to the vehicle electrical system via a DC / DC converter 10.
  • the electrical machine 3 is also connected to the capacitor 4.
  • the capacitor 4 is connected in parallel with the battery 5 via the switch 9, the switch 9 being controlled by the control device 10.
  • the ammeter 6 the battery current is recorded with the correct sign and integrated by the integrator 7.
  • the battery voltage is detected by means of the voltmeter 8.
  • the results are linked in the control unit 11 and displayed on the display unit.
  • it is also possible to regulate the battery current to approximately zero amperes by appropriate control and then measure the voltage after a waiting time.
  • the mode of operation of the method will now be explained on the basis of the processes in FIG. 2.
  • the top curve shows the battery current, which is measured by the ammeter 6.
  • an unloading process is initially shown, which is followed by a charging process. The sign changes accordingly from minus to plus.
  • This is followed by a phase for an OCV measurement in which the motor vehicle is still in driving mode. In this phase, the battery current is less than a residual current) l and ideally zero.
  • a discharge process follows again. However, the order of loading or unloading does not affect the process.
  • the curve for the energy content resulting from the current integration is shown below the battery current curve, initially only the dashed curve (without charging factor) should be taken into account. Due to the unloading process, the energy content first drops and then rises again during the charging process. At the beginning of the battery current phase of approximately zero amperes, the energy content initially remains constant due to the current integration. The terminal voltage on the battery is shown under the curve for the current integration, and this settles into a quiescent voltage after a time at a battery current of approximately zero amperes. After settling, the OCV measurement is carried out. The OCV measurement can also be used to determine the energy content. The result of the energy content after OCV measurement is then compared with the energy content after electricity integration.
  • SOC state of charge
  • the difference SOC state of charge
  • the current integration is then continued in the subsequent discharge phase with this corrected value.
  • the deviation from the actual energy content to the measured energy content is shown under the OCV measurement. It can be seen that in the unloading phase the unloading was more than measured and in the loading phase less was charged than measured. This leads to a systematic error, as can be seen from the monotonically falling dashed curve.
  • a charge factor is calculated and used as a correction factor in the subsequent current integration. Since in the example shown the current integration has measured an excessively high value for the energy content, the charge factor or adaptation factor is calculated to be 0.9, for example. The result can be seen from the solid lines, namely that the deviation between OCV measurement and current integration is smaller.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Secondary Cells (AREA)

Abstract

Procédé et dispositif de détermination du contenu d'énergie d'un accumulateur d'énergie (5) dans un véhicule à moteur. Ce dispositif comporte un dispositif de détection et d'intégration d'un courant (7) de l'accumulateur d'énergie. Pendant que le véhicule est en marche, le courant est mesuré en continu et intégré selon le signe de polarité. L'accumulateur d'énergie est associé à un dispositif qui permet de faire passer ledit accumulateur d'énergie, pendant la marche du véhicule, dans un état exempt de courant ou dans un état à faible taux de charge ou de décharge et qui permet une mesure de la tension de courant en circuit ouvert après un certain temps d'attente. Le contenu d'énergie déterminé par la mesure de la tension de courant en circuit ouvert est utilisé pour corriger la valeur sur la base de l'intégration du courant.
PCT/EP2005/004831 2004-05-10 2005-05-04 Procede et dispositif de determination du contenu d'energie d'un accumulateur d'energie Ceased WO2005111642A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004023621A DE102004023621A1 (de) 2004-05-10 2004-05-10 Verfahren und Vorrichtung zur Energieinhaltsbestimmung eines Energiespeichers
DE102004023621.6 2004-05-10

Publications (1)

Publication Number Publication Date
WO2005111642A1 true WO2005111642A1 (fr) 2005-11-24

Family

ID=34972163

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/004831 Ceased WO2005111642A1 (fr) 2004-05-10 2005-05-04 Procede et dispositif de determination du contenu d'energie d'un accumulateur d'energie

Country Status (2)

Country Link
DE (1) DE102004023621A1 (fr)
WO (1) WO2005111642A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012019960A1 (fr) * 2010-08-13 2012-02-16 Sb Limotive Company Ltd. Procédé de détermination de l'état de charge d'une batterie
EP2587622A3 (fr) * 2011-10-25 2013-08-28 Honda Motor Co., Ltd. Système d'évaluation de paramètre de capacité de charge d'un dispositif de stockage électrique
US8564299B2 (en) 2010-11-15 2013-10-22 Honda Motor Co., Ltd. Battery confirmation system and method for confirming state of charge in vehicle battery

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009038663B4 (de) * 2009-08-24 2017-07-06 Audi Ag Kraftwagen mit einer Mehrzahl von Batterien und Verfahren zur Batteriediagnose
DE102011007460A1 (de) * 2011-04-15 2012-10-18 Continental Automotive Gmbh Verfahren zur zyklischen Bestimmung des Ladezustandes eines elektrischen Energiespeichers
DE102014209252A1 (de) 2014-05-15 2015-11-19 Ford Global Technologies, Llc Verfahren zum Management der elektrischen Stromversorgung in einem Kraftfahrzeug
DE102014219416A1 (de) * 2014-09-25 2016-03-31 Bayerische Motoren Werke Aktiengesellschaft Energiespeichervorrichtung für ein Kraftfahrzeug und Verfahren zum Betreibeneiner Energiespeichervorrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1160953A2 (fr) * 2000-05-29 2001-12-05 Matsushita Electric Industrial Co., Ltd. Procédé de charge d'une batterie
EP1353191A2 (fr) * 2002-04-10 2003-10-15 Hitachi, Ltd. Appareil et méthode pour détecter l'état d'une batterie
US6646419B1 (en) * 2002-05-15 2003-11-11 General Motors Corporation State of charge algorithm for lead-acid battery in a hybrid electric vehicle
WO2004008166A1 (fr) * 2002-07-12 2004-01-22 Toyota Jidosha Kabushiki Kaisha Estimateur d'etat de charge d'une batterie

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1160953A2 (fr) * 2000-05-29 2001-12-05 Matsushita Electric Industrial Co., Ltd. Procédé de charge d'une batterie
EP1353191A2 (fr) * 2002-04-10 2003-10-15 Hitachi, Ltd. Appareil et méthode pour détecter l'état d'une batterie
US6646419B1 (en) * 2002-05-15 2003-11-11 General Motors Corporation State of charge algorithm for lead-acid battery in a hybrid electric vehicle
WO2004008166A1 (fr) * 2002-07-12 2004-01-22 Toyota Jidosha Kabushiki Kaisha Estimateur d'etat de charge d'une batterie
EP1548453A1 (fr) * 2002-07-12 2005-06-29 Toyota Jidosha Kabushiki Kaisha Estimateur d'etat de charge d'une batterie

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012019960A1 (fr) * 2010-08-13 2012-02-16 Sb Limotive Company Ltd. Procédé de détermination de l'état de charge d'une batterie
CN103119457A (zh) * 2010-08-13 2013-05-22 罗伯特·博世有限公司 一种用于确定蓄电池的充电状态的方法
US9395416B2 (en) 2010-08-13 2016-07-19 Robert Bosch Gmbh Method for determining a charge state of a battery
US8564299B2 (en) 2010-11-15 2013-10-22 Honda Motor Co., Ltd. Battery confirmation system and method for confirming state of charge in vehicle battery
EP2587622A3 (fr) * 2011-10-25 2013-08-28 Honda Motor Co., Ltd. Système d'évaluation de paramètre de capacité de charge d'un dispositif de stockage électrique
US8994324B2 (en) 2011-10-25 2015-03-31 Honda Motor Co., Ltd. Charge capacity parameter estimation system of electric storage device

Also Published As

Publication number Publication date
DE102004023621A1 (de) 2005-12-01

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