DE19920842A1 - Determining motor vehicle generator power reserve by calculation of instantaneous maximum power available and comparison with instantaneous power being drawn - Google Patents

Determining motor vehicle generator power reserve by calculation of instantaneous maximum power available and comparison with instantaneous power being drawn

Info

Publication number
DE19920842A1
DE19920842A1 DE19920842A DE19920842A DE19920842A1 DE 19920842 A1 DE19920842 A1 DE 19920842A1 DE 19920842 A DE19920842 A DE 19920842A DE 19920842 A DE19920842 A DE 19920842A DE 19920842 A1 DE19920842 A1 DE 19920842A1
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Germany
Prior art keywords
generator
current
power
power reserve
instantaneous
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
DE19920842A
Other languages
German (de)
Inventor
Uwe Dierker
Karsten Michels
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.)
Volkswagen AG
Original Assignee
Volkswagen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Volkswagen AG filed Critical Volkswagen AG
Priority to DE19920842A priority Critical patent/DE19920842A1/en
Publication of DE19920842A1 publication Critical patent/DE19920842A1/en
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G01R31/386—Arrangements for measuring battery or accumulator variables using test-loads
    • 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
    • H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
    • 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
    • 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
    • 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
    • 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

Abstract

The maximum current (Imax) that can be delivered from the generator under the current operating conditions is determined and this is compared with the current being taken from the generator (Iist) and a difference value calculated which represents the current available for charging the battery (L). From the available power reserve and the power being used by the generator it can be determined whether one or a number of power drains (L1...LN) need to be shut off or have their power supply reduced.

Description

Die Erfindung betrifft ein Verfahren zur Bestimmung der Leistungsreserve eines das Bordnetz eines Kraftfahrzeugs speisenden Generators gemäß Oberbegriff des Anspruchs 1.The invention relates to a method for determining the power reserve of a Vehicle electrical system of a generator feeding motor vehicle according to the preamble of claim 1.

Um den Bordnetzzustand eines Kraftfahrzeugs zu erkennen, sind Verfahren bekannt, die die momentane Kapazität der Fahrzeugbatterie unter Berücksichtigung ihrer Historie und den Wirkungsgrad der elektrischen Energieerzeugung berücksichtigen. Ein solches Verfahren beschreibt die DE 44 22 329 A1. Bei Vorliegen einer zu hohen Batteriebelastung können zeitweise einzelne elektrische Verbraucher abgeschaltet oder nur noch mit reduzierter Leistung betrieben werden.In order to recognize the on-board electrical system state of a motor vehicle, methods are known which current capacity of the vehicle battery taking into account its history and the Take the efficiency of electrical power generation into account. Such a process describes DE 44 22 329 A1. If the battery is too high, at times individual electrical consumers were switched off or only with reduced ones Power operated.

Aus der WO 96/19362 sind ebenfalls Maßnahmen bekannt, die bei einer Überlastung des Generators eine Reduzierung dessen elektrischer Belastung vorsehen. Der Auslastungsgrad des Generators wird durch ein pulsbreitenmoduliertes Signal angegeben, wobei eine große Pulsbreite bedeutet, daß der Generator nicht ausgelastet ist. Ein solches pulsbreitenmoduliertes Signal ist unter der Bezeichnung "DF-Signal" allgemein bekannt.Measures are also known from WO 96/19362 which, if the Generator provide a reduction in its electrical load. The degree of utilization of the generator is indicated by a pulse width modulated signal, with a large one Pulse width means that the generator is underutilized. Such one pulse width modulated signal is generally known under the name "DF signal".

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Bestimmung der Leistungsreserve eines das Bordnetz eines Kraftfahrzeugs speisenden Generators anzugeben, mit dem eine Aussage über die in einer jeweiligen Betriebssituation vorhandene Leistungsreserve des Generators gemacht werden kann.The invention has for its object a method for determining the Power reserve of a generator feeding the vehicle electrical system to indicate with which a statement about the existing in a respective operating situation Power reserve of the generator can be made.

Die Lösung dieser Aufgabe erhält man mit den im Anspruch 1 angegebenen Merkmalen.The solution to this problem is obtained with the features specified in claim 1.

Gemäß dem erfindungsgemäßen Verfahren wird der vom Generator lieferbare Maximalstrom, das heißt der Strom, der unter den vorliegendem Betriebsbedingungen bei Vollast des Generators von demselben geliefert werden kann, und der vom Generator gelieferte Iststrom ermittelt und die Differenz zwischen dem Maximalstrom und dem Iststrom gebildet. Die Größe der Differenz gibt dabei die verfügbare Leistungsreserve des Generators wieder. According to the method according to the invention, the one that can be supplied by the generator Maximum current, that is, the current that under the present operating conditions Full load of the generator can be supplied by the same, and that of the generator delivered actual current determined and the difference between the maximum current and the actual current educated. The size of the difference gives the available power reserve of the generator again.  

Der vom Generator lieferbare Maximalstrom wird vorzugsweise aus der Generatortemperatur und der Generatordrehzahl abgeleitet. Dies geschieht über ein Kennfeld, das in einem Speicher einer Regeleinrichtung abgelegt ist.The maximum current that can be supplied by the generator is preferably derived from the generator temperature and the generator speed. This is done via a map, which is in a Storage of a control device is stored.

Die zur Ermittlung des Maximalstroms notwendige Generatortemperatur kann mit Hilfe verschiedener Verfahren abgeleitet bzw. geschätzt werden.The generator temperature required to determine the maximum current can be determined using different methods can be derived or estimated.

Eine Möglichkeit besteht in der Ableitung über die Bordnetzspannung im Teillastbetrieb des Generators. Ein weiteres mögliches Verfahren liegt in der Ableitung der Generatortemperatur aus der Umgebungstemperatur, wobei als Umgebungstemperatur beispielsweise die Motortemperatur Verwendung finden kann, und dem Iststrom des Generators in einem vorherliegenden Zeitraum, das heißt einer abgespeicherten Historie des Iststroms für einen vorgegebenen Zeitraum.One possibility is to derive it from the vehicle electrical system voltage in part-load operation of the Generator. Another possible method is to derive the generator temperature from the ambient temperature, the ambient temperature being, for example, the Motor temperature can be used, and the actual current of the generator in one previous period, i.e. a stored history of the actual current for one given period.

Der vom Generator momentan gelieferte Iststrom kann aus dem vom Generator lieferbaren Maximalstrom und einem den Auslastungsgrad des Generators anzeigenden pulsweitenmodulierten DF-Signals ermittelt werden, wobei die Pulsweite des DF-Signals ein Maß für den Auslastungsgrad des Generators darstellt.The actual current currently supplied by the generator can be obtained from the current supplied by the generator Maximum current and one that indicates the degree of utilization of the generator pulse width modulated DF signal are determined, the pulse width of the DF signal Represents the degree of utilization of the generator.

Gemäß einer bevorzugten Ausbildung des erfindungsgemäßen Verfahrens werden in Abhängigkeit der Größe der ermittelten Leistungsreserve des Generators Verbraucher in Abhängigkeit einer vorbestimmten Klassifizierung zu- und/oder abgeschaltet. Eine Möglichkeit besteht in der Klassifizierung nach ihrer Stromaufnahme. Desweiteren kann vorgesehen sein, daß die Zu- und oder Abschaltung der Verbraucher außerdem in Abhängigkeit der Bordnetzspannung erfolgt.According to a preferred embodiment of the method according to the invention, in Dependence of the size of the determined power reserve of the generator consumer Switched on and / or off depending on a predetermined classification. A It is possible to classify them according to their current consumption. Furthermore can be provided that the connection and disconnection of the consumers also in Dependency of the vehicle electrical system voltage.

Auf diese Weise kann zu jeder möglichen Betriebssituation eine sehr genaue Angabe über die mögliche Leistungsreserve des Generators gemacht werden, so daß die Regeleinrichtung in der jeweiligen Betriebssituation mit großer Genauigkeit bestimmen kann, ob und gegebenenfalls welche elektrischen Verbraucher noch eingeschaltet werden können, ohne eine Entladung der Bordnetzbatterie zu bewirken.In this way, very precise information can be given for every possible operating situation the possible power reserve of the generator are made so that the Control device can determine with great accuracy in the respective operating situation, whether and if so which electrical consumers can still be switched on, without causing the on-board electrical system battery to discharge.

Nachfolgend wird die Erfindung anhand eines Ausführungsbeispiels näher beschrieben: Die zugehörigen Zeichnungen zeigen:The invention is described in more detail below using an exemplary embodiment: associated drawings show:

Fig. 1 ein Blockschaltbild der Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens, Fig. 1 is a block diagram of the apparatus for performing the method according to the invention,

Fig. 2 die maximale Stromleistung in Abhängigkeit von der Generatordrehzahl bei unterschiedlichen Generatortemperaturen und Fig. 2 shows the maximum power output as a function of the generator speed at different generator temperatures and

Fig. 3 die Abhängigkeit des DF-Signals von der Generatordrehzahl bei konstanter Stromleistung des Generators. Fig. 3 shows the dependence of the DF signal on the generator speed with constant current output of the generator.

Die in Fig. 1 in Form eines Blockschaltbildes dargestellte Vorrichtung umfaßt eine Regeleinrichtung 1, welche ausgangsseitig elektrische Verbraucher L1 bis Ln steuert, während eingangsseitig die Generatordrehzahl n, das pulsweitenmodulierte Signal DF, dessen Pulsweite den Auslastungsgrad des Generators angibt, und die Bordnetzspannung UBN anliegt.The device shown in FIG. 1 in the form of a block diagram comprises a control device 1 , which controls electrical consumers L1 to Ln on the output side, while the generator speed n, the pulse width modulated signal DF, the pulse width of which indicates the degree of utilization of the generator, and the on-board electrical system voltage U BN are present on the input side ,

Die Regeleinrichtung 1 ermittelt in einem ersten Schritt 10 aus der Bordnetzspannung UBN im Teillastbetrieb des Generators die Generatortemperatur T. Aus der Generatortemperatur T wiederum und der am Eingang der Regeleinrichtung anliegenden Generatordrehzahl n wird in einem zweiten Schritt 20 der vom Generator lieferbare Maximalstrom Imax bei den derzeitigen Betriebsbedingungen des Generators ermittelt. Dazu wird ein im Speicher 2 abgelegtes Generatordrehzahl-Generatortemperatur-Kennfeld verwendet, wie es in Fig. 2 dargestellt ist.In a first step 10 , the control device 1 determines the generator temperature T from the on-board electrical system voltage U BN in the part-load operation of the generator. The generator temperature T in turn and the generator speed n present at the input of the control device become in a second step 20 the maximum current I max that can be supplied by the generator the current operating conditions of the generator. For this purpose, a generator speed-generator temperature map stored in the memory 2 is used, as shown in FIG. 2.

In einem nächsten Schritt 30 berechnet die Regeleinrichtung 1 aus dem Maximalstrom Imax und dem den Auslastungsgrad des Generators anzeigenden pulsweitenmodulierten Signal DF den vom Generator gelieferten Iststrom Iist. Sowohl der Maximalstrom Imax als auch der Iststrom Iist werden im Schritt 40 miteinander verglichen und ihre Differenz gebildet, die ein Maß für die Leistungsreserven des Generators darstellt. In Abhängigkeit der Leistungsreserve L schaltet die Regeleinrichtung einzelne oder auch mehrere Verbraucher L1; . . . Ln zu oder auch ab, wobei die Verbraucher bezüglich ihrer Stromaufnahme klassifiziert werden. Neben dieser Klassifizierung sind jedoch auch Aufteilungen nach der Wahrnehmbarkeit durch die Fahrzeuginsassen oder ihrer Komfortverbesserung möglich.In a next step 30 , the control device 1 calculates the actual current I ist supplied by the generator from the maximum current I max and the pulse width modulated signal DF indicating the degree of utilization of the generator. Both the maximum current I max and the actual current I ist are compared with one another in step 40 and their difference is formed, which represents a measure of the power reserves of the generator. Depending on the power reserve L, the control device switches individual or also several consumers L1; , , , L n up or down, with the consumers being classified in terms of their current consumption. In addition to this classification, however, it is also possible to divide them according to whether they are perceptible by the vehicle occupants or to improve their comfort.

In Sonderfällen, d. h. bei einem hohen Auslastungsgrad des Generators, beispielsweise bei DF 100%, und einer Bordnetzspannung UBN, die zwischen der Sollspannung und der Batteriespannung liegt, ist das Zuschalten weiterer elektrischer Verbraucher möglich, obwohl die Ermittlung der Leistungsreserve L ergeben hat, daß keine Reserve mehr vorhanden ist. Dieser Fall kann durch die gleichzeitige Beobachtung der Bordnetzspannung UBN bei der Zu- oder Abschaltung elektrischer Verbraucher L1; . . . LN erfaßt werden. In special cases, i.e. with a high degree of utilization of the generator, for example DF 100%, and an electrical system voltage U BN that lies between the target voltage and the battery voltage, the connection of further electrical consumers is possible, although the determination of the power reserve L has shown that there is no reserve left. This case can be observed by simultaneously observing the on-board electrical system voltage U BN when switching on or off electrical consumers L1; , , , L N can be detected.

Fig. 3 zeigt den prinzipiellen Verlauf des DF-Signals, welches den Auslastungsgrad des Generators in Abhängigkeit von der Generatordrehzahl n bei einem konstanten Strom Iconst = 10A angibt. Fig. 3 shows the basic course of the DF signal n the degree of utilization of the generator in response to the generator speed at a constant current I const = 10A indicates.

BEZUGSZEICHENLISTELIST OF REFERENCE NUMBERS

11

Regeleinrichtung
control device

22

Speicher
L1 . . . Ln Storage
L1. , , L n

elektrische Verbraucher
electrical consumers

1010

. . . , , ,

7070

Verfahrensschritte
Imax steps
I max

Maximalstrom
Iist maximum current
I is

Iststrom
DF pulsweitenmoduliertes Signal
n Generatordrehzahl
UBN actual current
DF pulse width modulated signal
n generator speed
U BN

Bordnetzspannung
T, T1, T2 Generatortemperatur
L Leistungsreserve des Generators
Lsch Board supply voltage
T, T1, T2 generator temperature
L power reserve of the generator
L sh

Schwellwert
Iconst threshold
I const

Strom
electricity

Claims (8)

1. Verfahren zur Bestimmung der Leistungsreserve eines das Bordnetz eines Kraftfahrzeuges speisenden Generators, dadurch gekennzeichnet, daß der vom Generator lieferbare Maximalstrom (Imax) bei den momentanen Betriebsbedingungen des Generators und der vom Generator gelieferte Iststrom (Iist) ermittelt wird und die Differenz zwischen dem Maximalstrom (Imax) und dem Iststrom (Iist) gebildet wird, wobei die Größe der Differenz ein Maß für die verfügbare Leistungsreserve (L; LU) des Generators ist.1. A method for determining the power reserve of a generator feeding the vehicle electrical system of a motor vehicle, characterized in that the maximum current (I max ) which can be supplied by the generator is determined under the current operating conditions of the generator and the actual current (I actual) supplied by the generator and the difference between the maximum current (I max ) and the actual current (I ist ) is formed, the size of the difference being a measure of the available power reserve (L; L U ) of the generator. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der vom Generator lieferbare Maximalstrom (Imax) zumindest aus der Generatortemperatur (T, T1, T2) und der Generatordrehzahl (n) abgeleitet wird.2. The method according to claim 1, characterized in that the maximum current (I max ) which can be supplied by the generator is derived at least from the generator temperature (T, T1, T2) and the generator speed (n). 3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Generatortemperatur (T1,T2) aus der Bordnetzspannung (UBN) im Teillastbetrieb des Generators abgeleitet wird.3. The method according to claim 2, characterized in that the generator temperature (T1, T2) is derived from the vehicle electrical system voltage (U BN ) in the part-load operation of the generator. 4. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Generatortemperatur (T1,T2) aus der Umgebungstemperatur, insbesondere der Motorraumtemperatur, und dem lststrom (Iist) des Generators in einem direkt vorherliegenden Zeitraum ermittelt wird.4. The method according to claim 2, characterized in that the generator temperature (T1, T2) from the ambient temperature, in particular the engine compartment temperature, and the actual current (I ist ) of the generator is determined in a directly preceding period. 5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der vom Generator gelieferte Iststrom (Iist) aus dem vom Generator lieferbaren Maximalstrom (Imax) und einem den Auslastungsgrad des Generators anzeigenden pulsweitenmodulierten Signal (DF) ermittelt wird.5. The method according to any one of claims 1 to 4, characterized in that the actual current supplied by the generator (I ist ) is determined from the maximum current available from the generator (I max ) and a pulse width modulated signal (DF) indicating the degree of utilization of the generator. 6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß in Abhängigkeit der Größe der Leistungsreserve (L) des Generators klassifizierte Verbraucher (L1 . . . LN) zu- und/oder abgeschaltet werden. 6. The method according to any one of claims 1 to 5, characterized in that depending on the size of the power reserve (L) of the generator classified consumers (L1 ... L N ) are switched on and / or off. 7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß in Abhängigkeit der Größe der Leistungsreserve (L) des Generators und in Abhängigkeit der Größe der Bordnetzspannung (UBN) klassifizierte Verbraucher (L1 . . . LN) zu- und/oder abgeschaltet werden.7. The method according to any one of claims 1 to 6, characterized in that depending on the size of the power reserve (L) of the generator and depending on the size of the electrical system voltage (U BN ) classified consumers (L1 ... L N ) zu- and / or be switched off. 8. Verfahren nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß die Verbraucher (L1 . . . LN) zumindest nach ihrer Stromaufnahme klassifiziert werden.8. The method according to claim 6 or 7, characterized in that the consumers (L1 ... L N ) are classified at least according to their current consumption.
DE19920842A 1998-10-01 1999-05-06 Determining motor vehicle generator power reserve by calculation of instantaneous maximum power available and comparison with instantaneous power being drawn Ceased DE19920842A1 (en)

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DE19920842A DE19920842A1 (en) 1998-10-01 1999-05-06 Determining motor vehicle generator power reserve by calculation of instantaneous maximum power available and comparison with instantaneous power being drawn

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DE19845217 1998-10-01
DE19920842A DE19920842A1 (en) 1998-10-01 1999-05-06 Determining motor vehicle generator power reserve by calculation of instantaneous maximum power available and comparison with instantaneous power being drawn

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003033308A1 (en) * 2001-10-11 2003-04-24 Robert Bosch Gmbh Method and device for determining available electric power in an instrument panel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3936638C1 (en) * 1989-11-03 1991-03-14 Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De Ensuring electrical power supply in motor vehicle - grouping electrical appliances according to their importance for safety of vehicle
DE4422329A1 (en) * 1993-07-12 1995-01-19 Volkswagen Ag Method and device for operating an electrical system of an electrical vehicle
DE19514738A1 (en) * 1994-04-22 1995-10-26 Hitachi Ltd Generator control device for motor vehicles
WO1996019362A1 (en) * 1994-12-21 1996-06-27 Audi Ag Current consumption control for several current consumers in a motor vehicle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3936638C1 (en) * 1989-11-03 1991-03-14 Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De Ensuring electrical power supply in motor vehicle - grouping electrical appliances according to their importance for safety of vehicle
DE4422329A1 (en) * 1993-07-12 1995-01-19 Volkswagen Ag Method and device for operating an electrical system of an electrical vehicle
DE19514738A1 (en) * 1994-04-22 1995-10-26 Hitachi Ltd Generator control device for motor vehicles
WO1996019362A1 (en) * 1994-12-21 1996-06-27 Audi Ag Current consumption control for several current consumers in a motor vehicle
DE4445647A1 (en) * 1994-12-21 1996-06-27 Audi Ag Control of the current consumption of several electricity consumers in a motor vehicle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003033308A1 (en) * 2001-10-11 2003-04-24 Robert Bosch Gmbh Method and device for determining available electric power in an instrument panel
US7164256B2 (en) 2001-10-11 2007-01-16 Robert Bosch Gmbh Method and device for determining available electric power in an instrument panel

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