WO2010000536A1 - Method and device for estimating battery charge state - Google Patents

Method and device for estimating battery charge state Download PDF

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Publication number
WO2010000536A1
WO2010000536A1 PCT/EP2009/055857 EP2009055857W WO2010000536A1 WO 2010000536 A1 WO2010000536 A1 WO 2010000536A1 EP 2009055857 W EP2009055857 W EP 2009055857W WO 2010000536 A1 WO2010000536 A1 WO 2010000536A1
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WIPO (PCT)
Prior art keywords
battery
voltage
charge
current
generator
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PCT/EP2009/055857
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German (de)
French (fr)
Inventor
Markus Beck
Marc Knapp
Roman Lahmeyer
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Robert Bosch Gmbh
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Publication of WO2010000536A1 publication Critical patent/WO2010000536A1/en

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    • 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
    • G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
    • 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

Definitions

  • the present invention relates to the estimation of the state of charge of a connected in a circuit with at least one consumer battery, in particular the battery of a motor vehicle.
  • the internal resistance of such a battery is dependent on its state of charge. If a weak current is drawn from the battery to measure the terminal voltage, this will cause the measured terminal voltage to vary depending on the state of charge.
  • this effect is not usable with a built-in circuit battery such as the battery of a motor vehicle, as long as it can not be guaranteed that the battery at the time of a measurement is not burdened by consumers.
  • DE 10 2005 029 890 A1 therefore proposes a method for estimating the state of charge of a battery connected in a circuit, in which the pulse response of the battery is evaluated for a current pulse.
  • an alternative method for state of charge estimation is provided, which allows simple means an at least qualitative assessment of the state of charge of a battery.
  • the steps of the method are a) setting the battery current to a predetermined setpoint; b) measuring the battery voltage occurring at the setpoint; and c) Deciding the state of charge based on the measured battery voltage.
  • the output power of a second current connected to the battery is expediently set to adjust the battery current. regulated source.
  • the second power source is preferably a generator which can also be used to charge the battery.
  • the method according to the invention can be used with - A -
  • the voltage at the terminals of the battery is preferably regulated to a desired value in order to ensure a continuous supply to the consumer.
  • the method according to the invention can be carried out with the aid of a generator control unit which requires only minor adjustments compared with a generator control unit conventionally used in a motor vehicle.
  • a generator control unit which requires only minor adjustments compared with a generator control unit conventionally used in a motor vehicle.
  • a second regulator stage is additionally present. seen that derives the battery set voltage from the setpoint and an actual value of the battery current.
  • Fig. 1 is a block diagram of the electrical system of a motor vehicle
  • FIG. 2 is a block diagram of the control of the electrical system of FIG. 1; FIG. and
  • Fig. 3 shows a typical characteristic of the battery output voltage as a function of the state of charge.
  • FIG. 1 denotes a generator, 2 a generator controller which converts a control signal received on a line 3 into exciting currents for the windings of the generator 1, 4 a vehicle battery, 5 a battery sensor, 6 a control circuit for supplying a target voltage signal the generator controller 2 and 7, 8 consumers. Since consumers 7, 8 are in a driving force If all of the vehicles are never switched off and some of them are subject to arbitrary driver control via switches 9, the power consumption of the consumers 7, 8 is never zero and can not be reliably reliably predicted in the long run.
  • the structure of the control circuit 6, which embodies the most important aspects of the present invention, is shown in more detail in FIG.
  • the control circuit 6 receives from the battery sensor 5 measured values of the battery current I, the battery voltage U and possibly the temperature T of the battery 4.
  • a differential amplifier 10 is current, and with the signal of the actual I wired to a zero signal at the inverting or the non-inverting input ,
  • the differential amplifier 10 thus provides a depending on the sign of the battery current I is positive or negative drive signal to an integral proportional controller consisting of an amplifier 11, an integrator stage 12 and an adder 13 for adding the output signals of the amplifier 11 and the integrator stage 12.
  • the amplification of the amplifier 11 and the integrand of the integrator stage 12 can be predetermined as a function of the battery temperature T.
  • a second differential amplifier 14 has a wired with the target battery voltage Vietnamese inver- animal end input and a st with the actual voltage Ui wired inverting input.
  • a further proportional integral controller with amplifier 15, integrator stage 16 and adder 17 is connected to the output of the differential amplifier 14.
  • amplifier 15 and integrator stage 16 may be connected to the battery temperature signal T to produce a temperature dependent correction term Udiff indicative of the difference between the desired battery voltage and a generator output voltage needed to generate it.
  • the generator setpoint voltage formed in an adder 18 from the battery setpoint voltage and the correction term U d iff serves to query drive parameters of the generator 1 corresponding to this setpoint voltage from a table 19.
  • control circuit 6 If the control circuit 6 has reached a stationary state, then generates the generator 1 exactly as much power as the consumer 7, 8 and the control circuit 6 need to operate.
  • the battery 4 is unloaded and will not charge.
  • the detected by the battery sensor 3 actual voltage of the battery U is therefore in a clear relationship with the state of charge of the battery. 4
  • a characteristic curve is the relationship between measured by the sensor 3 and the battery voltage U describes the state of charge of the battery 4 is shown in Fig. 3.
  • the terminal voltage of the 12 volt specified battery 4 is in the unloaded Condition usually higher than 12 volts.
  • the fully charged unloaded battery reaches a terminal voltage of approximately 12.7 volts; with a charge capacity of 80%, it is still 12.5 volts. In this area, the battery is considered full.
  • a table 20 merely stores the voltage limit values required for the distinction between a full and a medium or between a medium and an empty battery, in this case 12.5 V or 12.2 V, and supplies the output of the Battery voltage U is corresponding state of charge.
  • more voltage limit values can also be stored to allow differentiation between a larger number of charge states, or the characteristic curve of FIG. 3 can be stored so that the table 20 as the output value for a measured value of the battery voltage U is the corresponding charge level the battery 4 can deliver in percent.

Abstract

the invention relates to a method for estimating the charge state of a battery connected in a circuit to at least one user, in particular, the battery of a motor vehicle, comprising the steps: a) adjusting the battery current to a given set value, b) measuring the battery voltage at the set value and c) deciding the charge state from the measured battery voltage.

Description

ROBERT BOSCH GMBH, 70442 STUTTGARTROBERT BOSCH GMBH, 70442 STUTTGART
R. 320262R. 320262
Verfahren und Vorrichtung zur Abschätzung des Bat- terieladezustandsMethod and device for estimating the battery charge state
Hintergrund der ErfindungBackground of the invention
Die vorliegende Erfindung betrifft die Abschätzung des Ladezustands einer in einem Stromkreis mit wenigstens einem Verbraucher verbundenen Batterie, insbesondere der Batterie eines Kraftfahrzeugs. Der Innenwiderstand einer solchen Batterie ist von ihrem Ladezustand abhängig. Wenn zum Messen der Klemmenspannung ein schwacher Strom aus der Batterie gezogen wird, führt dies dazu, dass die gemessene Klemmenspannung in Abhängigkeit vom Ladezustand variiert. Dieser Effekt ist jedoch bei einer in einem Stromkreis eingebauten Batterie wie etwa der Batterie eines Kraftfahrzeugs nicht nutzbar, solange nicht gewährleistet werden kann, dass die Batterie zur Zeit einer Messung nicht durch Verbraucher belastet ist.The present invention relates to the estimation of the state of charge of a connected in a circuit with at least one consumer battery, in particular the battery of a motor vehicle. The internal resistance of such a battery is dependent on its state of charge. If a weak current is drawn from the battery to measure the terminal voltage, this will cause the measured terminal voltage to vary depending on the state of charge. However, this effect is not usable with a built-in circuit battery such as the battery of a motor vehicle, as long as it can not be guaranteed that the battery at the time of a measurement is not burdened by consumers.
DE 10 2005 029 890 Al schlägt daher ein Verfahren zur Abschätzung des Ladezustandes einer in einem Stromkreis verbundenen Batterie vor, bei dem die Impulsantwort der Batterie auf einen Stromimpuls ausgewertet wird.DE 10 2005 029 890 A1 therefore proposes a method for estimating the state of charge of a battery connected in a circuit, in which the pulse response of the battery is evaluated for a current pulse.
Vorteile der ErfindungAdvantages of the invention
Durch die vorliegende Erfindung wird ein alternatives Verfahren zur Ladezustandsabschätzung geschaffen, das mit einfachen Mitteln eine zumindest qua- litative Abschätzung des Ladezustands einer Batterie erlaubt.By the present invention, an alternative method for state of charge estimation is provided, which allows simple means an at least qualitative assessment of the state of charge of a battery.
Die Schritte des Verfahrens sind a) Einstellen des Batteriestroms auf einen vorgege- benen Sollwert; b) Messen der bei dem Sollwert auftretenden Batteriespannung; und c) Entscheiden des Ladezustandes anhand der gemessenen Batteriespannung.The steps of the method are a) setting the battery current to a predetermined setpoint; b) measuring the battery voltage occurring at the setpoint; and c) Deciding the state of charge based on the measured battery voltage.
Messtechnisch besonders einfach und exakt ist das Einstellen des Batteriestroms auf einen Sollwert von Null.Particularly simple and accurate is the adjustment of the battery current to a setpoint value of zero.
Um Rückwirkungen der Messung auf einen Verbraucher auszuschließen, der normalerweise wenigstens teil- weise durch die Batterie gespeist wird, bzw. um den Leistungsbedarf dieses Verbrauchers während einer Messung zu decken, wird zum Einstellen des Batteriestroms zweckmäßigerweise die Ausgangsleistung einer mit der Batterie verbundenen zweiten Strom- quelle geregelt.In order to rule out the effects of the measurement on a consumer, which is normally supplied at least partially by the battery, or to cover the power requirement of this consumer during a measurement, the output power of a second current connected to the battery is expediently set to adjust the battery current. regulated source.
Bei der zweiten Stromquelle handelt es sich vorzugsweise um einen Generator, der auch zum Laden der Batterie einsetzbar ist.The second power source is preferably a generator which can also be used to charge the battery.
Da die zweite Stromquelle die Versorgung des Verbrauchers für die Zeit der Messung übernimmt, kann das erfindungsgemäße Verfahren bei eingeschal- - A -Since the second current source takes over the supply of the consumer for the time of the measurement, the method according to the invention can be used with - A -
tetem Verbraucher durchgeführt werden. Wenn keine Abschätzung des Ladezustands stattfindet, das heißt vor und/oder nach den Schritten a) und b) , wird vorzugsweise die Spannung an den Klemmen der Batte- rie auf einen Sollwert geregelt, um eine kontinuierliche Versorgung des Verbrauchers sicher zu stellen .tetem consumers are carried out. If no estimation of the state of charge takes place, ie before and / or after steps a) and b), the voltage at the terminals of the battery is preferably regulated to a desired value in order to ensure a continuous supply to the consumer.
Das erfindungsgemäße Verfahren ist mit Hilfe eines Generator-Steuergeräts durchführbar, das gegenüber einem herkömmlicherweise in einem Kraftfahrzeug eingesetzten Generator-Steuergerät nur geringer Anpassungen bedarf. So ist zusätzlich zu der an einem solchen Steuergerät üblicherweise vorhandenen Refe- renzsignalquelle für eine Batterie-Sollspannung, einem Eingang für eine Batterie-Istspannung und einer ersten Reglerstufe zum Ableiten einer Generator-Sollspannung von Batterie-Soll- und Istspannung zusätzlich eine zweite Reglerstufe vor- gesehen, die die Batterie-Sollspannung von dem Sollwert und einem Istwert des Batteriestroms ableitet. Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen unter Bezugnahme auf die beigefügten Figuren.The method according to the invention can be carried out with the aid of a generator control unit which requires only minor adjustments compared with a generator control unit conventionally used in a motor vehicle. Thus, in addition to the reference signal source usually present on such a control unit for a nominal battery voltage, an input for a battery actual voltage and a first regulator stage for deriving a desired generator voltage of nominal and actual battery voltage, a second regulator stage is additionally present. seen that derives the battery set voltage from the setpoint and an actual value of the battery current. Further features and advantages of the invention will become apparent from the following description of embodiments with reference to the accompanying figures.
Figurencharacters
Es zeigen:Show it:
Fig. 1 ein Blockdiagramm des elektrischen Systems eines Kraftfahrzeugs;Fig. 1 is a block diagram of the electrical system of a motor vehicle;
Fig. 2 ein Blockdiagramm der Steuerung des e- lektrischen Systems aus Fig. 1; undFIG. 2 is a block diagram of the control of the electrical system of FIG. 1; FIG. and
Fig. 3 eine typische Kennlinie der Batterie- Ausgangsspannung in Abhängigkeit von deren Ladezustand.Fig. 3 shows a typical characteristic of the battery output voltage as a function of the state of charge.
Beschreibung der AusführungsbeispieleDescription of the embodiments
In dem Diagramm der Fig. 1 bezeichnet 1 einen Generator, 2 einen Generatorregler, der ein auf einer Leitung 3 empfangenes Steuersignal in Erregerströme für die Wicklungen des Generators 1 umsetzt, 4 eine Fahrzeugbatterie, 5 einen Batteriesensor, 6 eine Steuerschaltung zum Liefern eines Sollspannungssignals an den Generatorregler 2 und 7, 8 Verbraucher. Da die Verbraucher 7, 8 in einem fahrenden Kraft- fahrzeug niemals alle ausgeschaltet sind und einzelne von ihnen über Schalter 9 der willkürlichen Kontrolle durch den Fahrer unterstehen, ist die Leistungsaufnahme der Verbraucher 7, 8 niemals Null und auch nicht langfristig zuverlässig vorhersagbar .In the diagram of Fig. 1, 1 denotes a generator, 2 a generator controller which converts a control signal received on a line 3 into exciting currents for the windings of the generator 1, 4 a vehicle battery, 5 a battery sensor, 6 a control circuit for supplying a target voltage signal the generator controller 2 and 7, 8 consumers. Since consumers 7, 8 are in a driving force If all of the vehicles are never switched off and some of them are subject to arbitrary driver control via switches 9, the power consumption of the consumers 7, 8 is never zero and can not be reliably reliably predicted in the long run.
Der Aufbau der Steuerschaltung 6, die die wichtigsten Aspekte der vorliegenden Erfindung verkörpert, ist in Fig. 2 genauer dargestellt. Die Steuerschaltung 6 empfängt vom Batteriesensor 5 Messwerte des Batteriestroms Iist, der Batteriespannung Uist sowie gegebenenfalls der Temperatur T der Batterie 4. Ein Differenzverstärker 10 ist mit dem Signal der Ist- Stromstärke Iist und einem Nullsignal am invertierenden beziehungsweise am nicht invertierenden Eingang beschaltet. Der Differenzverstärker 10 liefert somit ein je nach Vorzeichen des Batteriestroms Iist positives oder negatives Ansteuersignal an einen Integral-Proportionalregler, bestehend aus einem Verstärker 11, einer Integratorstufe 12 und einem Addierer 13 zum Addieren der Ausgangssignale des Verstärkers 11 und der Integratorstufe 12. Um das temperaturabhängige Verhalten der Batterie 4 nach- zubilden, können die Verstärkung des Verstärkers 11 sowie der Integrand der Integratorstufe 12 als Funktion der Batterietemperatur T vorgegeben sein.The structure of the control circuit 6, which embodies the most important aspects of the present invention, is shown in more detail in FIG. The control circuit 6 receives from the battery sensor 5 measured values of the battery current I, the battery voltage U and possibly the temperature T of the battery 4. A differential amplifier 10 is current, and with the signal of the actual I wired to a zero signal at the inverting or the non-inverting input , The differential amplifier 10 thus provides a depending on the sign of the battery current I is positive or negative drive signal to an integral proportional controller consisting of an amplifier 11, an integrator stage 12 and an adder 13 for adding the output signals of the amplifier 11 and the integrator stage 12. To the Depending on the temperature-dependent behavior of the battery 4, the amplification of the amplifier 11 and the integrand of the integrator stage 12 can be predetermined as a function of the battery temperature T.
Im stationären Zustand stellt sich am Ausgang des Addierers 13 eine Sollspannung für die Batterie 4 ein . Ein zweiter Differenzverstärker 14 hat einen mit der Batterie-Sollspannung beschalteten nichtinver- tierenden Eingang und einen mit der Istspannung Uist beschalteten invertierenden Eingang. An den Ausgang des Differenzverstärkers 14 ist ein weiterer Pro- portional-Integralregler mit Verstärker 15, Integratorstufe 16 und Addierer 17 angeschlossen. Auch hier können Verstärker 15 und Integratorstufe 16 mit dem Batterietemperatursignal T beschaltet sein, um einen temperaturabhängigen Korrekturterm Udiff zu erzeugen, der die Differenz zwischen der Batterie-Sollspannung und einer zu ihrer Erzeugung benötigten Generatorausgangsspannung angibt. Die in einem Addierer 18 aus der Batterie-Sollspannung und dem Korrekturterm Udiff gebildete Generator- Sollspannung dient zur Abfrage von dieser Sollspannung entsprechenden Ansteuerparametern des Generators 1 aus einer Tabelle 19. Wenn die Steuerschaltung 6 einen stationären Zustand erreicht hat, er- zeugt somit der Generator 1 exakt so viel Strom, wie die Verbraucher 7, 8 und die Steuerschaltung 6 zu ihrem Betrieb benötigen. Die Batterie 4 ist unbelastet und wird auch nicht geladen. Die vom Batteriesensor 3 erfasste Istspannung der Batterie Uist steht daher in einem eindeutigen Zusammenhang mit dem Ladezustand der Batterie 4.In the stationary state, a set voltage for the battery 4 is established at the output of the adder 13. A second differential amplifier 14 has a wired with the target battery voltage nichtinver- animal end input and a st with the actual voltage Ui wired inverting input. To the output of the differential amplifier 14, a further proportional integral controller with amplifier 15, integrator stage 16 and adder 17 is connected. Again, amplifier 15 and integrator stage 16 may be connected to the battery temperature signal T to produce a temperature dependent correction term Udiff indicative of the difference between the desired battery voltage and a generator output voltage needed to generate it. The generator setpoint voltage formed in an adder 18 from the battery setpoint voltage and the correction term U d iff serves to query drive parameters of the generator 1 corresponding to this setpoint voltage from a table 19. If the control circuit 6 has reached a stationary state, then generates the generator 1 exactly as much power as the consumer 7, 8 and the control circuit 6 need to operate. The battery 4 is unloaded and will not charge. The detected by the battery sensor 3 actual voltage of the battery U is therefore in a clear relationship with the state of charge of the battery. 4
Eine Kennkurve, die den Zusammenhang zwischen der vom Sensor 3 gemessenen Batteriespannung Uist und dem Ladezustand der Batterie 4 beschreibt, ist in Fig. 3 dargestellt. Die Klemmenspannung der mit 12 Volt spezifizierten Batterie 4 ist im unbelasteten Zustand normalerweise höher als 12 Volt. Die voll geladene unbelastete Batterie erreicht eine Klemmenspannung von circa 12,7 Volt; bei einer Ladekapazität von 80% sind es noch 12,5 Volt. In diesem Bereich wird die Batterie als voll beurteilt. Bei einer Ladekapazität zwischen 55 und 80%, entsprechend einer Klemmenspannung von 12,2 bis 12,5 Volt, wird die Batterie als mittelvoll bewertet; darunter wird sie als leer beurteilt, weil die restliche ge- speicherte Ladung nur noch bei einer stark abfallenden Klemmenspannung entnommen werden kann, die im normalen Betrieb deutlich unter 12 Volt liegt und ein normales Funktionieren der Verbraucher 7, 8 eventuell nicht mehr gewährleistet. Eine Tabelle 20 speichert im einfachsten Fall lediglich die für die Unterscheidung zwischen einer vollen und einer mittelvollen bzw. zwischen einer mittelvollen und einer leeren Batterie benötigten Spannungsgrenzwerte, hier also 12,5 V bzw. 12,2V, und liefert als Ausga- bewert den der Batteriespannung Uist entsprechenden Ladezustand. Selbstverständlich können auch mehr Spannungsgrenzwerte gespeichert sein, um eine Unterscheidung zwischen einer größeren Zahl von Ladezuständen zu ermöglichen, oder es kann die Kennkur- ve der Fig. 3 gespeichert sein, damit die Tabelle 20 als Ausgabewert zu einem Messwert der Batteriespannung Uist den enstprechenden Ladegrad der Batterie 4 in Prozent liefern kann. A characteristic curve is the relationship between measured by the sensor 3 and the battery voltage U describes the state of charge of the battery 4 is shown in Fig. 3. The terminal voltage of the 12 volt specified battery 4 is in the unloaded Condition usually higher than 12 volts. The fully charged unloaded battery reaches a terminal voltage of approximately 12.7 volts; with a charge capacity of 80%, it is still 12.5 volts. In this area, the battery is considered full. With a charge capacity between 55 and 80%, corresponding to a terminal voltage of 12.2 to 12.5 volts, the battery is rated as medium; underneath it is judged to be empty, because the remaining stored charge can only be removed with a strongly decreasing terminal voltage, which in normal operation is well below 12 volts and a normal functioning of the consumers 7, 8 may no longer be guaranteed. In the simplest case, a table 20 merely stores the voltage limit values required for the distinction between a full and a medium or between a medium and an empty battery, in this case 12.5 V or 12.2 V, and supplies the output of the Battery voltage U is corresponding state of charge. Of course, more voltage limit values can also be stored to allow differentiation between a larger number of charge states, or the characteristic curve of FIG. 3 can be stored so that the table 20 as the output value for a measured value of the battery voltage U is the corresponding charge level the battery 4 can deliver in percent.

Claims

R . 3202 62Patentansprüche R. 3202 62Patent claims
1. Verfahren zur Abschätzung des Ladezustandes einer in einem Stromkreis mit wenigstens einem Verbraucher verbundenen Batterie, insbesondere einer Batterie eines Kraftfahrzeugs, mit den Schritten a) Einstellen des Batteriestroms auf einen vorgegebenen Sollwert; b) Messen der bei dem Sollwert auftretenden Batteriespannung; und c) Entscheiden des Ladezustandes anhand der gemessenen Batteriespannung.1. A method for estimating the state of charge of a connected in a circuit with at least one consumer battery, in particular a battery of a motor vehicle, comprising the steps of a) setting the battery current to a predetermined desired value; b) measuring the battery voltage occurring at the setpoint; and c) deciding the state of charge based on the measured battery voltage.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Sollwert des Batteriestroms im Wesentlichen Null ist.2. The method according to claim 1, characterized in that the desired value of the battery current is substantially zero.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass zum Einstellen des Batte¬ riestroms die Ausgangsleistung einer mit der Batterie verbundenen zweiten Stromquelle gere¬ gelt wird.3. The method according to claim 1 or 2, characterized in that for adjusting the Batte ¬ riestroms the output power of a second power source connected to the battery is gere ¬ gelt.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass die zweite Stromquelle ein Ge- nerator ist.4. The method according to claim 3, characterized in that the second current source is a generator.
5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass es bei eingeschaltetem Verbraucher durchgeführt wird. 5. The method according to any one of the preceding claims, characterized in that it is carried out with the consumer switched on.
6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass nach dem Schritt b) und/oder vor dem Schritt a) die Batteriespannung auf einen Sollwert geregelt wird.6. The method according to any one of the preceding claims, characterized in that after step b) and / or before step a) the battery voltage is regulated to a desired value.
7. Generator-Steuergerät zur Durchführung des Verfahrens nach einem der vorhergehenden An- Sprüche, mit einer Referenzsignalquelle für eine Batterie-Sollspannung, einem Eingang für eine Batterie-Istspannung (Uist) und einer ersten Reglerstufe (14-18) zum Ableiten einer Generator-Sollspannung von Batterie-Soll- und - Istspannung, dadurch gekennzeichnet, dass als die Referenzsignalquelle eine zweite Reglerstufe (10-13) vorgesehen ist, die die Batterie-Sollspannung von dem Sollwert (0) und einem Istwert des Batteriestroms (Iist) ableitet. 7. generator control unit for carrying out the method according to one of the preceding claims, with a reference signal source for a battery voltage setpoint, an input for a battery actual voltage (U is ) and a first controller stage (14-18) for deriving a generator -Soll voltage of battery set and - actual voltage, characterized in that as the reference signal source, a second controller stage (10-13) is provided, which derives the battery set voltage from the setpoint (0) and an actual value of the battery current (I ist ) ,
PCT/EP2009/055857 2008-07-04 2009-05-14 Method and device for estimating battery charge state WO2010000536A1 (en)

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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

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