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

Method and device for estimating battery charge state Download PDF

Info

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
Authority
WO
WIPO (PCT)
Prior art keywords
battery
voltage
characterized
current
method according
Prior art date
Application number
PCT/EP2009/055857
Other languages
German (de)
French (fr)
Inventor
Markus Beck
Marc Knapp
Roman Lahmeyer
Original Assignee
Robert Bosch Gmbh
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
Priority to DE102008040194.3 priority Critical
Priority to DE102008040194A priority patent/DE102008040194A1/en
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2010000536A1 publication Critical patent/WO2010000536A1/en

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3835Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3828Arrangements for monitoring battery or accumulator variables, e.g. SoC using current integration

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 STUTTGART

R. 320262

Method and apparatus for estimating the bat- terieladezustands

Background of the Invention

The present invention relates to the estimation of the state of charge of a battery connected in a circuit with at least one consumer, in particular the battery of a motor vehicle. The internal resistance of such a battery is dependent on its state of charge. for measuring the terminal voltage when a weak current is drawn from the battery, this leads to that the measured terminal voltage varies depending on the state of charge. However, this effect is not usable with a built in a circuit of the battery such as the battery of a motor vehicle, unless it can be guaranteed that the battery is not charged at the time of measurement by consumers.

Therefore, DE 10 2005 029 890 Al proposes a method for estimating the state of charge of a battery connected in a circuit in which the impulse response of the battery is evaluated in a current pulse.

Advantages of the Invention

The present invention provides an alternative method of charging state estimation is provided, which allows with simple means at least a qualitative estimate of the state of charge of a battery.

The steps of the method are a) adjusting the battery current to a predetermined set value; b) measuring the battery voltage appearing at the target value; and c) determining the state of charge based on the measured battery voltage.

Metrologically particularly easily and accurately is to adjust the battery current to a desired value of zero.

In order to exclude reactions of the measurement to a consumer, who normally, at least partly is powered by the battery, or to cover the power requirements of this load during a measurement is used to adjust the battery current expediently the output power of a second power connected to the battery source regulated.

In the second current source is preferably a generator, which is also used for charging the battery.

A - Since the second current source accepts the consumer's supply for the time of measurement, the inventive method may in eingeschal- -

tetem consumers are performed. If no estimate of the state of charge takes place, that is, before and / or after the steps a) and b), preferably the voltage is regulated at the terminals of the battery-rie to a desired value to provide a continuous supply to the load safely.

The inventive method is carried out with the aid of a generator control device that requires only minimal adjustments compared with a conventionally employed in a motor vehicle generator controller. Thus, in addition to the normally present in such a control unit refer- ence signal source for a target battery voltage, an input for a battery-actual voltage and a first regulator stage for deriving a generator target voltage of battery set and actual voltage in addition a second regulator stage upstream seen, which derives the target battery voltage from the target value and an actual value of the battery current. Other features and advantages of the invention will become apparent from the following description of exemplary embodiments with reference to the accompanying figures.

characters

Show it:

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 e- lektrischen system of FIG. 1; and

Fig. 3 shows a typical characteristic curve of the battery output voltage as a function of its state of charge.

Description of Embodiments

In the diagram of Fig. 1, 1 designates a generator, 2 a generator controller, which converts a received on line 3 control signal in excitation currents for windings of the generator 1, 4 a vehicle battery, 5 a battery sensor 6 to a control circuit for providing a voltage command signal generator controller 2 and 7, 8 consumers. As consumers 7, 8 vehicle in a moving force never are all switched off and some are subject of them switch 9 of arbitrary control by the driver, is the power of consumers 7, 8 never zero nor reliable long-term predictable.

The construction of the control circuit 6, which represents the most important aspects of the present invention is illustrated in more detail in Fig. 2. 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 driving 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 temperature-dependent behavior of the battery 4 zubilden demand, the gain of amplifier 11 as well as the integrand of the integrator stage 12 may be determined as a function of battery temperature T.

In the steady state is established at the output of the adder 13 is a target voltage for the battery 4, a. 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 an amplifier 15, integrator stage 16 and adder 17 is connected. Here, too, amplifier 15 and integrator stage 16 may be wired to the battery temperature signal T to produce a temperature-dependent correction term Udiff, which indicates the difference between the target battery voltage and a need for their production generator output voltage. The formed in an adder 18 from the target battery voltage and the correction term U d iff generator voltage command is used to request the target voltage corresponding control parameters of the generator 1 from a table 19. If the control circuit 6 has reached a steady state, thus pro- duces the generator 1 precisely as much power as the load 7, 8 and the control circuit 6 need for their operation. The battery 4 is unloaded and is not loaded. Detected by the battery sensor 3 actual voltage U of the battery is thus in a unique connection 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 specified 12-volt battery 4 is normally higher than 12 volts in the unloaded state. The fully loaded unloaded battery reaches a terminal voltage of about 12.7 volts; with a load capacity of 80%, there are still 12.5 volts. In this range, the battery is judged to be full. With a charging capacity between 55 and 80%, corresponding to a terminal voltage of 12.2 to 12.5 volts, the battery is judged to be medium in full; less, it is judged to be empty because the rest of the overall stored charge can only be removed at a rapidly decreasing terminal voltage is within the normal operating well below 12 volts and a normal functioning of consumer 7, 8 may no longer be guaranteed. A table 20 stores, in the simplest case, only the needed for the distinction between a full and a full medium, and between a medium-full and an empty battery voltage limits, in this case 12.5 V or 12,2V, and provides, as the expenditure of bewert battery voltage U is the corresponding state of charge. Of course, more voltage threshold values may be stored to permit a distinction between a larger number of states of charge, or it may be the Kennkur- ve FIG. 3 can be stored so that the table 20 is as an output value to a measured value of the battery voltage U the enstprechenden charging efficiency the battery 4 can supply a percentage.

Claims

R. 3202 62Patentansprüche
1. A method of estimating the state of charge of a battery connected in a circuit with at least one consumer, in particular a battery of a motor vehicle, comprising the steps of a) adjusting the battery current to a predetermined target value; b) measuring the battery voltage appearing at the target value; and c) determining the state of charge based on the measured battery voltage.
2. The method according to claim 1, characterized in that the nominal value of the battery current is substantially zero.
3. The method of claim 1 or 2, characterized in that for adjusting the Batte ¬ riestroms the output of a second current source connected to the battery is Gere ¬ gel.
4. The method according to claim 3, characterized in that the second current source is an overall erator.
5. The method according to any one of the preceding claims, characterized in that it is carried out when the consumer.
6. The method according to any one of the preceding claims, characterized in that after step b), the battery voltage is regulated to a desired value prior to the step a) and / or.
7. generator control device for implementing the method according to any preceding arrival spells, with a reference signal source for a target battery voltage, an input for a battery-actual voltage (U ist) and a first regulator stage (14-18) for deriving a generator -Sollspannung of battery set and - actual voltage, characterized in that the reference signal source, a second regulator stage (10-13) is as provided which the target battery voltage from the nominal value (0) and an actual value of the battery current (I ist) derived ,
PCT/EP2009/055857 2008-07-04 2009-05-14 Method and device for estimating battery charge state WO2010000536A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE102008040194.3 2008-07-04
DE102008040194A DE102008040194A1 (en) 2008-07-04 2008-07-04 Method and device for the battery SOC Absschätzung

Publications (1)

Publication Number Publication Date
WO2010000536A1 true WO2010000536A1 (en) 2010-01-07

Family

ID=41211808

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/055857 WO2010000536A1 (en) 2008-07-04 2009-05-14 Method and device for estimating battery charge state

Country Status (2)

Country Link
DE (1) DE102008040194A1 (en)
WO (1) WO2010000536A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4007350A1 (en) * 1989-03-08 1990-09-20 Hitachi Ltd System for power conversion
US5451881A (en) * 1993-12-10 1995-09-19 Curtis Instruments, Inc. Method and means for adjusting battery monitor based on rate of current drawn from the battery
DE19541959A1 (en) * 1994-11-11 1996-05-15 Fuji Heavy Ind Ltd Control device for electric vehicle batteries
DE19849055A1 (en) * 1998-10-24 2000-04-27 Daimler Chrysler Ag Process for the continuous monitoring and control of the charge state of a traction battery for use in automobile hybrid drive systems has means for displaying battery charge state with reference to upper and lower charge limits
DE19918529A1 (en) * 1999-04-23 2000-11-23 Inst Solare Energieversorgungstechnik Iset Method and appliance for determining state of charge and/or capacity of battery with correction based on previously determined characteristic of residual charge as function of recovery voltage
DE19952693A1 (en) * 1999-10-14 2001-05-23 Akkumulatorenfabrik Moll Gmbh Measurement, determination and display of condition of an automotive starter battery using one or more sensor for measuring charge, temperature, voltage, etc. to provided detailed information about current and future state, etc.
US6300763B1 (en) * 2000-11-27 2001-10-09 Delphi Technologies, Inc. Method of calculating dynamic state-of-charge within a battery
EP1201504A1 (en) * 2000-10-21 2002-05-02 Robert Bosch Gmbh Method for controlling power-supply of controllable loads in a vehicle
DE10158062A1 (en) * 2000-11-27 2002-07-25 Delphi Tech Inc Charging batteries with reduced overcharging level involves modulating down resulting charging voltage applied to battery depending on overcharging commencement condition
EP1293388A2 (en) * 2001-09-14 2003-03-19 Audi Ag Energy management device and method for energy management in a vehicle
DE10209136A1 (en) * 2002-03-01 2003-09-11 Bosch Gmbh Robert Device for detecting starting of a motor vehicle with an external energy source monitors the battery internal resistance and or the engine rotational velocity during and after starting
EP1480051A2 (en) * 2003-05-19 2004-11-24 Akkumulatorenfabrik Moll GmbH & Co. KG Device and method for the determination of the high current capacity of a battery
DE10346856A1 (en) * 2003-10-09 2005-05-04 Bosch Gmbh Robert Control process for a motor vehicle on board voltage generator increases or decreases the battery charging voltage according to the detected voltage needs of the vehicle electrical system
WO2006005739A1 (en) * 2004-07-13 2006-01-19 Siemens Aktiengesellschaft Battery sensor and method for operation of a battery sensor
FR2884928A1 (en) * 2005-04-20 2006-10-27 Denso Corp Neural network device for detecting e.g. state of charge of lead storage battery, has neural network controller providing, by applying neutral network calculation on input parameters, output signal indicating internal state of battery
US20060279288A1 (en) * 2003-11-11 2006-12-14 Midtronics, Inc. Apparatus and method for simulating a battery tester with a fixed resistance load
DE102005029890A1 (en) * 2005-06-27 2007-01-04 Robert Bosch Gmbh Motor vehicle battery check, e.g. for a hybrid vehicle, uses a mathematical model to evaluate measured voltage with other parameters to determine the charging and ageing conditions
DE102005050563A1 (en) * 2005-10-21 2007-04-26 Robert Bosch Gmbh A method for predicting the performance of electrical energy storage
US20090045815A1 (en) * 2007-08-14 2009-02-19 Gm Global Technology Operations, Inc. Method and apparatus for managing power flow of an electric power storage device

Patent Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4007350A1 (en) * 1989-03-08 1990-09-20 Hitachi Ltd System for power conversion
US5451881A (en) * 1993-12-10 1995-09-19 Curtis Instruments, Inc. Method and means for adjusting battery monitor based on rate of current drawn from the battery
DE19541959A1 (en) * 1994-11-11 1996-05-15 Fuji Heavy Ind Ltd Control device for electric vehicle batteries
DE19849055A1 (en) * 1998-10-24 2000-04-27 Daimler Chrysler Ag Process for the continuous monitoring and control of the charge state of a traction battery for use in automobile hybrid drive systems has means for displaying battery charge state with reference to upper and lower charge limits
DE19918529A1 (en) * 1999-04-23 2000-11-23 Inst Solare Energieversorgungstechnik Iset Method and appliance for determining state of charge and/or capacity of battery with correction based on previously determined characteristic of residual charge as function of recovery voltage
DE19952693A1 (en) * 1999-10-14 2001-05-23 Akkumulatorenfabrik Moll Gmbh Measurement, determination and display of condition of an automotive starter battery using one or more sensor for measuring charge, temperature, voltage, etc. to provided detailed information about current and future state, etc.
EP1201504A1 (en) * 2000-10-21 2002-05-02 Robert Bosch Gmbh Method for controlling power-supply of controllable loads in a vehicle
US6300763B1 (en) * 2000-11-27 2001-10-09 Delphi Technologies, Inc. Method of calculating dynamic state-of-charge within a battery
DE10158062A1 (en) * 2000-11-27 2002-07-25 Delphi Tech Inc Charging batteries with reduced overcharging level involves modulating down resulting charging voltage applied to battery depending on overcharging commencement condition
EP1293388A2 (en) * 2001-09-14 2003-03-19 Audi Ag Energy management device and method for energy management in a vehicle
DE10209136A1 (en) * 2002-03-01 2003-09-11 Bosch Gmbh Robert Device for detecting starting of a motor vehicle with an external energy source monitors the battery internal resistance and or the engine rotational velocity during and after starting
EP1480051A2 (en) * 2003-05-19 2004-11-24 Akkumulatorenfabrik Moll GmbH & Co. KG Device and method for the determination of the high current capacity of a battery
DE10346856A1 (en) * 2003-10-09 2005-05-04 Bosch Gmbh Robert Control process for a motor vehicle on board voltage generator increases or decreases the battery charging voltage according to the detected voltage needs of the vehicle electrical system
US20060279288A1 (en) * 2003-11-11 2006-12-14 Midtronics, Inc. Apparatus and method for simulating a battery tester with a fixed resistance load
WO2006005739A1 (en) * 2004-07-13 2006-01-19 Siemens Aktiengesellschaft Battery sensor and method for operation of a battery sensor
FR2884928A1 (en) * 2005-04-20 2006-10-27 Denso Corp Neural network device for detecting e.g. state of charge of lead storage battery, has neural network controller providing, by applying neutral network calculation on input parameters, output signal indicating internal state of battery
DE102005029890A1 (en) * 2005-06-27 2007-01-04 Robert Bosch Gmbh Motor vehicle battery check, e.g. for a hybrid vehicle, uses a mathematical model to evaluate measured voltage with other parameters to determine the charging and ageing conditions
DE102005050563A1 (en) * 2005-10-21 2007-04-26 Robert Bosch Gmbh A method for predicting the performance of electrical energy storage
US20090045815A1 (en) * 2007-08-14 2009-02-19 Gm Global Technology Operations, Inc. Method and apparatus for managing power flow of an electric power storage device

Also Published As

Publication number Publication date
DE102008040194A1 (en) 2010-01-07

Similar Documents

Publication Publication Date Title
US6362598B2 (en) Method for determining the state of charge and loading capacity of an electrical storage battery
EP0713101B1 (en) Remaining battery capacity meter and method for computing remaining capacity
CN101192757B (en) Charging system, charging device and battery pack
US20030183191A1 (en) Charge control system for a vehicle battery
US20100174499A1 (en) Apparatus for estimating open circuit voltage of battery, apparatus for estimating state of charge of battery, and method for controlling the same
JP4075762B2 (en) Calculating apparatus and method of calculating the remaining capacity of the secondary battery
CN102279368B (en) Battery performance monitor
US6388450B2 (en) Method for determining the state of charge of storage batteries
EP0225364B1 (en) Monitoring state of battery charge
EP1873542B1 (en) Apparatus and method for estimating charge of a battery
EP0206503B1 (en) Method and apparatus for determining the state of charge of a battery
US6943528B2 (en) Method and arrangement for determination of the state of charge of a battery
US20140257726A1 (en) Apparatus and method for battery state of charge estimation
KR100839382B1 (en) Battery management system and driving method thereof
US7317300B2 (en) Automotive battery state monitor apparatus
JP4984527B2 (en) The device for estimating charged state and method of estimating charged state of a secondary battery
US6268712B1 (en) Method for determining the starting ability of a starter battery in a motor vehicle
US6515454B2 (en) Method and system for determining the capacity of a battery
EP2323238A2 (en) Available charging/discharging current calculation method and power supply device
JP4793332B2 (en) Method of estimating the battery state of charge
US5598088A (en) Method for determining the charge state of a battery, in particular a vehicle starter battery
JP4057276B2 (en) Determining method and apparatus state of the secondary battery mounted on a vehicle
CN1269303C (en) Electric power generating system for a vehicle
US20090033294A1 (en) Vehicle source device
JP2008043188A (en) Input/output electric power control device and method for secondary battery

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: 09772236

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 09772236

Country of ref document: EP

Kind code of ref document: A1