EP1391023A2 - Verfahren und vorrichtung zur bestimmung der startfähigkeit eines fahrzeugs - Google Patents

Verfahren und vorrichtung zur bestimmung der startfähigkeit eines fahrzeugs

Info

Publication number
EP1391023A2
EP1391023A2 EP02716823A EP02716823A EP1391023A2 EP 1391023 A2 EP1391023 A2 EP 1391023A2 EP 02716823 A EP02716823 A EP 02716823A EP 02716823 A EP02716823 A EP 02716823A EP 1391023 A2 EP1391023 A2 EP 1391023A2
Authority
EP
European Patent Office
Prior art keywords
battery
value
vehicle
internal resistance
determined
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02716823A
Other languages
German (de)
English (en)
French (fr)
Inventor
Rainer Mäckel
Roger Zimmermann
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.)
Mercedes Benz Group AG
Original Assignee
DaimlerChrysler 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 DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP1391023A2 publication Critical patent/EP1391023A2/de
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/10—Safety devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • B60R16/0315—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for using multiplexing techniques
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/40—The network being an on-board power network, i.e. within a vehicle
    • H02J2310/46—The network being an on-board power network, i.e. within a vehicle for ICE-powered road vehicles

Definitions

  • the invention relates to a method for determining the starting ability of a vehicle, in particular during the starting process of the vehicle. Furthermore, the invention relates to a device for determining the starting ability of the vehicle.
  • Safety-related functions in vehicles are increasingly being operated electrically, e.g. electric brakes. To ensure that the functionality of such safety-relevant components is guaranteed, they must be permanently supplied with electrical energy. For this purpose, it is known to provide two energy sources in the vehicle, namely a battery and a generator.
  • the battery When the vehicle is at rest, the battery is usually charged. Such a discharge of the battery can lead to such a low battery state of charge that starting or other functions of the vehicle are no longer guaranteed. Reliable information about the battery charge state is therefore required.
  • DE 37 12 629 C2 also discloses a measuring device for the remaining service life of a vehicle battery, in which the terminal voltage voltage and the load current of the battery, the internal resistance of the battery is determined in a temperature-compensated manner before and after the vehicle is started, and a signal is generated on the basis of a ratio and a comparison with a limit value, which indicates the determined battery life.
  • the object of the invention is to provide a method for determining the starting ability of a vehicle, which enables particularly simple and reliable detection of the functionality of the battery.
  • a particularly simple device for determining the ability to start is to be specified.
  • the first-mentioned object is achieved according to the invention by a method for determining the starting ability of a vehicle, current values and voltage values of a battery being recorded during a predetermined time window, in particular during the starting of the vehicle, an internal resistance of the current values and the voltage values using linear regression Battery is determined and a reference resistance value for the starting behavior of the vehicle is determined on the basis of a maximum value for the current and minimum value for the voltage recorded within the predetermined time window, a value representing the starting ability being determined on the basis of a comparison of the internal resistance with the reference resistance value ,
  • the internal resistance of the battery is preferably determined on the basis of the current and voltage values measured during the starting behavior.
  • the current values representing the falling edge and the voltage values representing the rising edge are determined, on the basis of which the internal resistance is determined by means of linear regression.
  • the reference resistance value is preferably determined within a time window of the start phase on the basis of the maximum value for the current and minimum value for the voltage representing this time window.
  • This ratio represents the resistance of the starter circuit, ie the motor.
  • the value for the internal resistance of the battery is expediently monitored for equality or falling below the reference resistance value of the starter circuit. In the event of equality or if the value of the internal resistance falls below the reference resistance value by at least 1%, a starting ability is given.
  • a signal message is advantageously output. This ensures that a signal message indicating the critical condition of the battery is output before the battery is no longer capable of being started, so that measures necessary for the ability to start can be taken in good time.
  • the temperature of the battery and / or a starter circuit of the vehicle is preferably determined. This enables both the reference resistance of the starter circuit and the internal resistance of the battery to be determined as precisely as possible, taking into account their temperature dependence. Alternatively or additionally, the starting ability of the battery at a different temperature can be determined and thus predicted on the basis of a current temperature of the battery and a current temperature of the starter circuit, in particular the engine. Depending on a temperature of the battery and / or the starter circuit that is currently or at a given point in time, the value representing the internal resistance or reference resistance value is preferably used to represent the temperature representing the starting ability at a different temperature and thus at a later point in time determined, especially inter- and extrapolated.
  • the ability of the battery to start can be predicted taking into account the temperature profile over time. This ensures that when the temperature drops, especially when the temperature of the starter circuit drops, for example the engine temperature at which the starting power increases disproportionately, the starting ability can be assessed at a later point in time.
  • the state of charge of the battery is advantageously monitored and linked to the internal resistance of the battery in such a way that the battery is disconnected from the vehicle electrical system when the internal resistance falls below a limit for a given state of charge. This ensures that if the battery is in a critical state, it is disconnected from the vehicle electrical system in good time. In particular, in the event of a longer standstill of the vehicle, during which the battery is permanently discharged, a critical condition is recognized in good time, so that the battery can be disconnected, if necessary.
  • the second-mentioned object is achieved according to the invention by a device for determining the starting ability of a vehicle with a current sensor for detecting current values and a voltage sensor for detecting voltage values of a battery during a predetermined time window, in particular during the starting of the vehicle, an evaluation unit being provided for the determination an internal resistance of the battery on the basis of the current values and the voltage values by means of linear regression and for determining a reference resistance value for the starting behavior of the vehicle on the basis of a within the predetermined time window. ters detected maximum value for the current and minimum value for the voltage, wherein a value representing the starting ability can be determined on the basis of a comparison of the internal resistance with the reference resistance value. This provides a particularly simple device which can be used regardless of the vehicle type or battery type.
  • FIG. 1 schematically shows a device for determining the
  • FIG. 1 shows a device 1 for determining the starting ability of a vehicle 2 with a battery 4 for providing a voltage U for an electrical system 6.
  • the electrical system 6 is supplied with voltage U of the battery 4.
  • the on-board electrical system 6 can be supplied with voltage U by the generator 8 of the vehicle 2 as a second energy source.
  • the device 1 comprises a means 10 for controlling the battery 4 (hereinafter referred to as battery control unit 10).
  • the battery control unit 10 comprises a current sensor 12 for detecting and determining current values I and a voltage voltage sensor 14 for detecting and determining voltage values U of the battery 4.
  • An evaluation unit 16 is provided for evaluating and processing the detected current values I and voltage values U.
  • a disconnection unit 18 is provided for disconnecting the battery 4 from the vehicle electrical system 6 depending on the presence of a predefinable operating state.
  • An internal resistance R ⁇ of the battery 4 is determined by means of the evaluation unit 16 on the basis of the current values I and the voltage values U detected within a predetermined time window by means of linear regression.
  • the time window in particular represents the behavior of the voltage U and the current I during the starting phase of the vehicle 2 or during another predetermined loading or resting phase of the battery 4.
  • the time window is considered to be the time range that determines the starting behavior of the vehicle 2 describes.
  • the time range is selected such that the falling edge of the current I and the rising edge of the voltage U are detected.
  • the evaluation unit 16 further determined on the basis of the time window detected current values I and voltage U a maximum value I max is the current I and a minimum value U m i n for the voltage U.
  • a reference Resistance value R s for the starting behavior of vehicle 2 is determined, which represents in particular the resistance of the starter circuit of vehicle 2, in particular the engine.
  • further criteria such as the state of aging of the battery 4 and / or the vehicle 2, battery capacity, which influence the internal resistance Ri of the battery 4 or the reference resistance R s , can be taken into account when determining them.
  • the internal resistance Ri of the battery 4 and the reference resistance R s of the starter circuit are compared by means of the evaluation unit 16. On the basis of this comparison, a value representing the starting ability is determined. For this purpose, the internal resistance Ri and the reference resistance R s are compared with one another in such a way that a currently determined value of the internal resistance Ri of the battery 4 is monitored for falling below the reference resistance value Rs of the starter circuit.
  • the function curve of the internal resistance R ⁇ and the reference resistance as a function of the state of charge L of the battery 4 is shown as an example in FIG. This ensures that the state of charge L of the battery 4, which significantly influences the internal resistance Ri of the battery 4, is taken into account. If, for example, the battery 4 is permanently discharged, for example when the vehicle 2 is at the airport for a longer period of time, the state of charge L can be monitored as follows. Starting from the fact that the state of charge L of the battery 4 is directly linked to its internal resistance Ri, an upper limit value G 0 and a lower limit value G ⁇ are specified for the internal resistance R ⁇ . A resulting tolerance range T B represents the critical range for the starting ability of the vehicle 2.
  • a signal message M acoustically or optically, is output by means of the evaluation unit 16. This signal or warning message M indicates to a user of the vehicle 2 that the ability to start is limited or no longer present. Alternatively or additionally, the signal message M triggers the separation unit 18, which before the battery 4 disconnects from the electrical system 6. When the vehicle 2 is stationary, the battery 4 is only connected to the vehicle electrical system 6 again immediately before the start by closing the separation unit 18.
  • the internal resistance R ⁇ and the reference resistance R s is shown as a function of time. Due to the age of the vehicle 2, in particular due to abrasion in cylinders, due to aging of the engine oil, the reference resistance value R s of the starter circuit changes depending on the time t. The evaluation resistor 16 continuously determines the reference resistance R s as a further possibility. To determine the value representing the ability to start, a dynamic threshold value S of +/- 2% is assigned to the reference resistance value R s . When comparing the reference resistance value R s of the starter circuit with the currently determined internal resistance Ri of the battery 4, the latter is monitored for falling below the reference resistance value R s , in particular for falling below the dynamic threshold value S.
  • the vehicle 2 is capable of being started. If the internal resistance R x is equal to or greater than the lower threshold value of -10% of the reference resistance value R s , the starting ability is at least endangered or not given. In this case, a signal message M representing the reduced ability to start is output, which may open the separation unit 18.
  • the threshold value S for the reference resistance value R s is specified as a function of the vehicle type, battery type and age. For example, the threshold value S varies between 1% and 20% of the reference resistance value R s of the starter circuit, in particular the motor.
  • FIG. 4 shows the internal resistance Ri and the reference resistance R s as a function of the temperature T.
  • the evaluation unit 16 starts the vehicle 2 determined at a different temperature T2 or T3.
  • the instantaneous temperature T1 is detected by means of a temperature sensor (not shown in more detail).
  • the temperature T of the battery 4 and / or the starter circuit, in particular the motor can be detected.
  • the temperatures T and T TTER Y Ba motor separately detected and used to determine a starting capability at a different temperature T2.
  • the internal resistance R ⁇ and / or the reference resistance R s to a different temperature T2 and T3 are determined on the basis of the currently determined temperature T1 by means of interpolation and extrapolation.
  • the respective associated value of the internal resistance Ri is then compared with the associated reference resistance value R s by means of the evaluation unit 16. If the distance between the reference resistance value R s and the value of the internal resistance Ri is sufficiently large for the temperature T2 in question, ie the value of the internal resistance Ri falls below the reference resistance value R s , a starting ability is given.
  • the internal resistance Ri is approximately equal to the reference resistance value R s . In this case, starting ability is no longer guaranteed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Secondary Cells (AREA)
  • Tests Of Electric Status Of Batteries (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
EP02716823A 2001-05-26 2002-03-05 Verfahren und vorrichtung zur bestimmung der startfähigkeit eines fahrzeugs Withdrawn EP1391023A2 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10125819A DE10125819B4 (de) 2001-05-26 2001-05-26 Verfahren und Vorrichtung zur Bestimmung der Startfähigkeit eines Fahrzeugs
DE10125819 2001-05-26
PCT/EP2002/002369 WO2002096717A2 (de) 2001-05-26 2002-03-05 Verfahren und vorrichtung zur bestimmung der startfähigkeit eines fahrzeugs

Publications (1)

Publication Number Publication Date
EP1391023A2 true EP1391023A2 (de) 2004-02-25

Family

ID=7686321

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02716823A Withdrawn EP1391023A2 (de) 2001-05-26 2002-03-05 Verfahren und vorrichtung zur bestimmung der startfähigkeit eines fahrzeugs

Country Status (5)

Country Link
US (1) US7026787B2 (enrdf_load_stackoverflow)
EP (1) EP1391023A2 (enrdf_load_stackoverflow)
JP (1) JP3887820B2 (enrdf_load_stackoverflow)
DE (1) DE10125819B4 (enrdf_load_stackoverflow)
WO (1) WO2002096717A2 (enrdf_load_stackoverflow)

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Also Published As

Publication number Publication date
DE10125819B4 (de) 2013-06-06
JP2004526978A (ja) 2004-09-02
US20040239332A1 (en) 2004-12-02
US7026787B2 (en) 2006-04-11
WO2002096717A3 (de) 2003-03-27
DE10125819A1 (de) 2002-11-28
WO2002096717A2 (de) 2002-12-05
JP3887820B2 (ja) 2007-02-28

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