WO2007033983A1 - Procede et dispositif pour determiner l'etat d'une batterie dans un circuit electrique comprenant un demarreur pour un moteur a combustion interne - Google Patents

Procede et dispositif pour determiner l'etat d'une batterie dans un circuit electrique comprenant un demarreur pour un moteur a combustion interne Download PDF

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Publication number
WO2007033983A1
WO2007033983A1 PCT/EP2006/066606 EP2006066606W WO2007033983A1 WO 2007033983 A1 WO2007033983 A1 WO 2007033983A1 EP 2006066606 W EP2006066606 W EP 2006066606W WO 2007033983 A1 WO2007033983 A1 WO 2007033983A1
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WO
WIPO (PCT)
Prior art keywords
battery
voltage
value
measured variable
determining
Prior art date
Application number
PCT/EP2006/066606
Other languages
German (de)
English (en)
Inventor
Hans-Michael Graf
Alexander Hahn
Carola Kühn
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2007033983A1 publication Critical patent/WO2007033983A1/fr

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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]
    • G01R31/3644—Constructional arrangements
    • G01R31/3647—Constructional arrangements for determining the ability of a battery to perform a critical function, e.g. cranking
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/04—Measuring peak values or amplitude or envelope of ac or of pulses
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
    • G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
    • G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries

Definitions

  • the invention relates to a method for determining the battery condition of a battery in a circuit with a starter for an internal combustion engine.
  • the invention relates to a device for carrying out the method for determining the condition of batteries.
  • Such, also called starter batteries batteries are used for electrical starting of the engine by the starter upon actuation of a z.
  • B. ignition key or starter button in the circuit i. Closing the circuit.
  • the battery In order to successfully start the internal combustion engine, it is necessary here for the battery to be able to supply sufficient operating voltage and starting current, ie to provide a sufficient minimum power for the duration of the starting process, ie. until the internal combustion engine runs automatically.
  • FIG. 1 An exemplary voltage curve during a starting process, as is known in particular from DE 101 07 583 A1, is evident from FIG. 1 of the specific description part.
  • the battery voltage U B is plotted in volts over time t in milliseconds.
  • the voltage curve 42 is shown from a time before pressing the start button in the starter circuit.
  • the board voltage therefore initially corresponds to the open circuit voltage of the battery and is typically ⁇ , between 12V and 13V.
  • time t 0 ms, the circuit between starter and battery is closed.
  • the voltage drops within 20ms to a value of about 8V as the minimum value.
  • For the on-board electronics of this clamping voltage is ⁇ burglar critical and the starting process is continued.
  • Such battery monitoring systems measure - if necessary ⁇ together with additional quantities such as the battery current or the battery temperature - which during a starting operation or the presence let the internal combustion engine to the battery voltage applied, or the voltage curve over time.
  • the measurement used in the latter battery monitoring system ⁇ technology and the related evaluation, and evaluation ⁇ logic is relatively complex and therefore expensive. With additional current measurement, the currents to be measured are in the multi-digit ampere range and are therefore difficult to measure.
  • the object of the invention is therefore to provide an improved procedural ⁇ ren for determining the battery condition of a battery in an electrical circuit with a starter for an Verbrennungsmo ⁇ tor specify and create an associated facility.
  • the object is achieved by the Abfol ⁇ ge of the measures of the claim and in terms of the device through the entirety of the features of the patent ⁇ award 10. Further developments of the method and the associated device are specified in the respective dependent claims.
  • a battery condition in a circuit with a systems for starting ser for an internal combustion engine determines a measuring device, preferably a single value of a correlated with the minimum voltage of the battery when starting the internal combustion engine measured variable, the value is in a vorzugswei ⁇ se
  • An analogue memory stores passive logic components and preferably reads an evaluation unit from this value from the analog memory and determines therefrom the battery status.
  • the invention is based on the insight that the minimum voltage of the battery during the starting procedure the determining large ⁇ SSE represents success for the start of the engine. Since ⁇ it is sufficient to perform an indirect voltage measurement, yet to obtain statements about the battery condition in sufficient accuracy. Therefore, according to the invention, instead of the minimum voltage itself, a value ei ⁇ ner measured variable correlated to the minimum voltage is determined. In this case, the measured variable chosen is one that can be buffer-stored without any effort, which can be done in particular in an analog memory. According to the invention, therefore, the value of the measured variable correlated with the minimum voltage is stored in a simple and cost-effective manner in order to be read out by the evaluation unit after a predeterminable time be further processed to determine the battery condition.
  • the device according to the invention advantageously requires only the aforementioned analog memory, which is constructed from passive components according to current state of the art.
  • analog memory is also constructed of purely passive elements with a capacitor, it will be cheaper and easier to produce. In addition, it does not require its own power supply and thus becomes error-prone.
  • the measuring rate or measuring frequency can be low, z.
  • the measuring rate or measuring frequency can be low, z.
  • z For example, in the IHz range.
  • Appropriate measurement technique is compared to the above-mentioned range from 100Hz to 1OkHz also interpreting ⁇ simpler and more cost-effective.
  • the stored on the capacitor voltage is indeed customary ⁇ a bit above the actual minimum voltage of Batte ⁇ rie, however, is sufficiently correlated therewith to Aussa ⁇ gen allow the battery condition. Since no conversion will take place to be measured, the minimum voltage to another measurement variable, but also as a measure of a voltage is USAGE ⁇ det, the analog memory is particularly simple and kos ⁇ -effectively feasible.
  • the use of a capacitor as a storage element is also particularly inexpensive.
  • the value of the voltage in the capacitor can be stored via a diode.
  • the use of a poled in ent ⁇ speaking biased diode ensures during cranking operation that the voltage on capacitor terieight with decreasing bat- this may be followed with virtually no time delay.
  • the correlation of stored value and minimum clamping voltage ⁇ is known about the diode voltages. Increases the Batte ⁇ rierison but again, the diode is prevented by its barrier property to the voltage increases again and therefore the value of the measured variable at the condenser, leading to the desired
  • Determining the value of the measured variable in the Messeinrich ⁇ tung may be associated with a filter. With the filter is the Signal quality of the measured variable increased. By an appropriate filter can be such. B. noise from the measured who ⁇ the, to obtain more accurate readings readings.
  • the measured value stored in the analog memory is then not correlated with the actual, but uncritical, but with the minimum voltage and duration of the battery permitted with respect to the engine electronics.
  • a corresponding, in particular analog preprocessing of the signal of the measured variables ⁇ SSE through a filter is especially simple, robust and cost-effective to carry out.
  • the inventive method can be used to determine the Batte ⁇ rieCloudes in a road or rail vehicle USAGE ⁇ be det.
  • the method according to the invention can be carried out by a specific battery monitoring system. This is by using the method according to the invention, as already explained in detail above, inexpensive, simple and inexpensive executable, robust and error-prone. Thus, it is z. B. suitable for serial production in the automotive industry without causing significant additional costs in an automobile.
  • the device mentioned above for determining the battery condition of a battery in a circuit with a starter for an internal combustion engine a measuring device for determining a value of a correlated with the minimum voltage of the battery when starting the combus ⁇ tion motor, measured from a passive construction Elements existing analog memory for storing the Wer ⁇ tes and an evaluation unit for reading the value from the analog memory and to determine the battery status.
  • FIG. 2 shows a starter circuit of a motor vehicle having been ⁇ herebyem battery monitoring system
  • Figure 3 shows the analog memory of Fig. 2 in detail
  • Figure 4 shows the time profile of the battery voltage and the capacitor voltage of FIG. 3 in a simplified Dar position
  • FIG. 5 shows an analog memory with upstream reasonssfil ⁇ ter
  • Figure 6 shows the input voltage of the analog memory of Figure 5
  • Figure 7 shows the input voltage of the analog memory of Figure 5 with upstream input filter
  • Figure 8 th original traces of the battery voltage with the un ⁇ ter Kunststofflichen voltage signals as Simulationsda ⁇ .
  • Fig. 2 shows a starter circuit 2 of a motor vehicle, not shown, and a connected to the starter circuit 2 battery monitor 4.
  • the starter circuit 2 includes a starter ⁇ battery 6, which via connecting lines 8 to an ignition switch 10 and a einwir ⁇ kenden starter for an internal combustion engine 12 14 are connected in series.
  • the battery monitor 4 comprises a measuring unit 16 and an evaluation unit 18 communicating therewith, wherein the measuring unit 16 in turn comprises an analog memory 20 and a voltmeter 22.
  • the analog memory 20 is connected via measuring lines 24 with the ⁇ at the battery terminals of the starter battery 6, so that the battery voltage U B is applied to the analog memory 20.
  • FIG. 3 shows the analog memory 20 from FIG. 1 together with the starter battery 6 and the voltmeter 22 in detail.
  • one of the measuring line 24 is connected to a terminal of a capacitor 30 via the parallel connection of a resistor 26 with a diode 28.
  • the other measuring line 24 leads directly to the other terminal of the condenser ⁇ sators 30.
  • the voltmeter 22 in turn is connected directly to the two terminals of the capacitor 30 so that it detects the voltage applied to the capacitor U 0 .
  • the capacitor 30 is together with the resistor 26 and the diode 28 with respect to the resulting time constant so dimensioned or interconnected, that with reduction of the battery voltage U B, the capacitor voltage U 0 follows this almost without a time delay, ie together with this decreases. This is essentially achieved by discharging the capacitor 30 via the then conducting diode 28 to the battery 6.
  • the capacitor 30 is charged only very slowly, so that the capacitor voltage U 0 rises only very slowly, or remains almost constant for short periods of time, in the example about one second. This is because the diode 28 is off.
  • the correspondingly dimensioned system of starter circuit 2 and battery monitor 4 from FIG. 2 shows, in the case of a typical voltage curve of the battery voltage U B according to FIG. 6 already discussed, during the starting process of the motor vehicle the voltage profiles from FIG. 3.
  • Fig. 4 shows a simplified representation compared to FIG. 1 as a voltage curve 32, the course of the battery voltage U B and 34 as the voltage curve of the capacitor voltage U c , respectively in volts over time t in milliseconds for the starting process of the internal combustion engine 12th
  • the starter circuit 2 alone, it ie flow there is no Strö ⁇ me, the battery voltage U B has an open circuit voltage of about 12 V.
  • the capacitor 30 is charged, that is, the ⁇ sen voltage U c essentially corresponds to the battery voltage U B , so is also greater than 12V.
  • the ignition switch 10 is now actuated, ie the circuit between the starter battery 6 and starter 14 ge ⁇ closed. Due to the battery 6, which is tert geal ⁇ in the example, this is no longer able to provide sufficient power for the starter 14 are available while keeping their battery voltage U B sufficient. This breaks down to a value below 6V.
  • the capacitor 30 is instantaneously discharged via the diode 28 to the starter battery 6, so that its voltage U 0 is the battery voltage U B follows and also drops to a value below 6V.
  • the starting process is not successful, ie the Verbrennungsmo ⁇ tor 12 does not start because the battery voltage U B breaks below the critical value of 6 V and the engine electronics, not shown, the internal combustion engine 12 fails.
  • the starting process is interrupted due to the failure of the engine electronics, ie, the ignition switch 10 is opened electronically from this again.
  • the battery voltage U B recovers quickly and rises again to its idling value of just over 12V.
  • the starting process is therefore approximately in the voltage curve 32 as a rectangular pulse Darge ⁇ provides.
  • the diode blocks 28 in Fig. 2 due to the Kon ⁇ capacitor voltage Uc of about 6 V.
  • the resistor 26 for charging the capacitor 30 so dimensio ⁇ that it will only be recharged very slowly; only after 5 s does the capacitor voltage U 0 exceed the limit of 6 V.
  • the clamping ⁇ voltage value Uc is in this case due to the aforementioned coagulating ⁇ gen time constants of the voltage rise in the voltage curve 34 below 6 V.
  • the evaluation unit 18 therefore determines the battery state 36 of the starter battery 6 in this case as "not to start suitable".
  • the operator of The motor vehicle not shown, therefore receives an unillustrated message from the evaluation unit 18, for example on a multifunction display, to replace the battery 6, since this has caused the unsuccessful starting process of the internal combustion engine 12.
  • FIG. 5 shows a variant of the battery monitor 4, with a filter 38 connected upstream of the analog memory 20 in the measuring lines 24. This prepares the battery voltage U B and generates an input voltage U E therefrom, which is then forwarded via the measuring lines 24 to the analog memory 20, finally influencing the capacitor voltage U c .
  • Fig. 6 shows, for the embodiment of FIG. 5 is a voltage waveform alternatives of the battery voltage U B according to Fig. 1.
  • the course of Kon ⁇ densatorpressive Uc voltage spikes 40 are, for possesses. B. vehicle caused by interference with other electronic components in the power ⁇ .
  • the voltage peaks 40 are ineffective for the engine electronics of the internal combustion engine 12, since this is protected by a corresponding input filter.
  • the voltage peaks 40 of ⁇ half are not important.
  • the voltage U effetspan- B is particularly low min by superimposing one of the spikes 40, whose value is for the Beur ⁇ the starting ability of division is not relevant.
  • the filter 38 in FIG. 5 is therefore advantageously designed as a low-pass filter in order to filter the voltage peaks 40 from the course of the battery voltage U B.
  • the input voltage U E in Fig. 7 is therefore smoothed ge ⁇ geninate the profile of the battery voltage U B in Fig. 6, ie, the voltage peaks 40 are eliminated.
  • the voltage U E causes in the analog memory 20 a profile of the graph 34 of the capaci ⁇ tors voltage U c , which is shown in dashed lines in Fig. 7. In the capacitor 30 is as a minimum voltage U 0 , min of the Assessing the starting capability correct value U E, min vomit ⁇ chert.
  • Figure 42 shows the signal curve is the measured battery voltage U B and shows the signal waveform 44 by a Filter ⁇ tion of the curve 42 graphs obtained.
  • the curve 44 is smoothed against ⁇ over curve 42, wherein in both cases a prinzi ⁇ piell same curve corresponding to Figure 1 is present.
  • the minimum of the curve 33 is slightly shifted in time and is slightly higher, which is caused by the low-pass filter 38.
  • Curves 33 and 34 show the signal stored in the capacitor without and with filtering. It can be seen that in the graphs 33 and 34 of the slight voltage dip does not appear when you press the ignition. In both cases, however, there is also a steep voltage drop, the minima due to the diode and possibly filters in the memory are slightly above the minima of the curves 42 and 44. Starting from the minimum value U 0 , min, there is a slow rise, which due to the component is caused by discharging the capacitor but can be reproduced in time.
  • the latter means that in both cases no fast online measurement is necessary, but only needs to be measured after a predefinable time interval, for example after 0.5 s or 1 s.
  • a significant point in the graphs 33 and 34 is nalwert with the thus detected Sig ⁇ in both cases detected, which is correlated with the minimum battery voltage.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

L'invention concerne un procédé servant à déterminer l'état (36) d'une batterie (6) dans un circuit électrique (8) comprenant un démarreur (14) pour un moteur à combustion interne (12). Selon ce procédé, un dispositif de mesure (16) détermine, de manière avantageuse, une valeur unique (UC,min) d'une grandeur de mesure (UC) corrélée avec la tension minimale (UB,min) de la batterie (6) lors du démarrage du moteur à combustion interne (12). La valeur (UC,min) est mémorisée dans une mémoire analogique (20) constituée de composants passifs (26, 28, 30). Une unité d'évaluation (18) lit la valeur (UC,min) dans la mémoire analogique (20) et en déduit l'état (36) de la batterie. L'invention concerne également un dispositif servant à déterminer l'état (36) d'une batterie (6) dans un circuit électrique (8) comprenant un démarreur (14) pour un moteur à combustion interne (12). Ce dispositif comprend un dispositif de mesure (16) servant à déterminer une valeur (UC,min) d'une grandeur de mesure (UC) corrélée avec la tension minimale (UB,min) de la batterie (6) lors du démarrage du moteur à combustion interne (12), une mémoire analogique (20) constituée de composants passifs (26, 28, 30) et servant à stocker la valeur (UC,min), ainsi qu'une unité d'évaluation (18) servant à lire la valeur (UC,min) dans la mémoire analogique (20) et à déterminer l'état (36) de la batterie.
PCT/EP2006/066606 2005-09-22 2006-09-21 Procede et dispositif pour determiner l'etat d'une batterie dans un circuit electrique comprenant un demarreur pour un moteur a combustion interne WO2007033983A1 (fr)

Applications Claiming Priority (2)

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DE102005045217 2005-09-22
DE102005045217.5 2005-09-22

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WO2007033983A1 true WO2007033983A1 (fr) 2007-03-29

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022111652A1 (de) 2022-05-10 2022-07-07 Daimler Truck AG Verfahren zum Bestimmen eines Gesundheitszustands zumindest einer Batteriezelle des elektrischen Energiespeichers sowie Überwachungsvorrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS638574A (ja) * 1986-06-30 1988-01-14 Nissan Motor Co Ltd 自動車用バツテリの容量低下警報装置
US5900734A (en) * 1997-12-22 1999-05-04 Munson; Edward J Low battery voltage detection and warning system
EP0961383A1 (fr) * 1998-05-29 1999-12-01 Siemens Aktiengesellschaft Méthode et dispositif pour tester la capacité d'un condensateur de stockage dans un système de protection de passagers
DE19831723A1 (de) * 1998-07-15 2000-01-20 Porsche Ag Verfahren zur Ladezustanderkennung einer Fahrzeugbatterie

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS638574A (ja) * 1986-06-30 1988-01-14 Nissan Motor Co Ltd 自動車用バツテリの容量低下警報装置
US5900734A (en) * 1997-12-22 1999-05-04 Munson; Edward J Low battery voltage detection and warning system
EP0961383A1 (fr) * 1998-05-29 1999-12-01 Siemens Aktiengesellschaft Méthode et dispositif pour tester la capacité d'un condensateur de stockage dans un système de protection de passagers
DE19831723A1 (de) * 1998-07-15 2000-01-20 Porsche Ag Verfahren zur Ladezustanderkennung einer Fahrzeugbatterie

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022111652A1 (de) 2022-05-10 2022-07-07 Daimler Truck AG Verfahren zum Bestimmen eines Gesundheitszustands zumindest einer Batteriezelle des elektrischen Energiespeichers sowie Überwachungsvorrichtung

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