DE102017208024B4 - Method for operating a power supply device of a vehicle electrical system for a motor vehicle - Google Patents
Method for operating a power supply device of a vehicle electrical system for a motor vehicle Download PDFInfo
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- 238000004146 energy storage Methods 0.000 claims abstract description 46
- 239000000446 fuel Substances 0.000 claims abstract description 23
- 230000005540 biological transmission Effects 0.000 claims abstract description 22
- 238000005265 energy consumption Methods 0.000 claims 1
- 238000010008 shearing Methods 0.000 abstract description 2
- 230000001419 dependent effect Effects 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 description 19
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
- B60L15/2009—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed for braking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
- B60L15/2054—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed by controlling transmissions or clutches
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/10—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines
- B60L50/16—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines with provision for separate direct mechanical propulsion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
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- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
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- B60L7/14—Dynamic electric regenerative braking for vehicles propelled by ac motors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/10—Conjoint control of vehicle sub-units of different type or different function including control of change-speed gearings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/18—Propelling the vehicle
- B60W30/18009—Propelling the vehicle related to particular drive situations
- B60W30/18109—Braking
- B60W30/18127—Regenerative braking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/18—Propelling the vehicle
- B60W30/18009—Propelling the vehicle related to particular drive situations
- B60W30/18072—Coasting
- B60W2030/18081—With torque flow from driveshaft to engine, i.e. engine being driven by vehicle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/06—Combustion engines, Gas turbines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/06—Combustion engines, Gas turbines
- B60W2510/0638—Engine speed
- B60W2510/0647—Coasting condition
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/24—Energy storage means
- B60W2510/242—Energy storage means for electrical energy
- B60W2510/244—Charge state
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/30—Auxiliary equipments
- B60W2510/305—Power absorbed by auxiliaries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/10—Change speed gearings
- B60W2710/1005—Transmission ratio engaged
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Automation & Control Theory (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Hybrid Electric Vehicles (AREA)
Abstract
Verfahren zum Betreiben einer Energieversorgungseinrichtung (1) eines Bordnetzes (2) für ein Kraftfahrzeug, bei welchem- mittels eines Generators (7) an einem ein Getriebe (5) aufweisenden Antriebsstrang (3) des Kraftfahrzeugs über eine Fahrdrehzahl eines Antriebselements (6) eine Leistung abgegriffen wird, mittels welcher das Bordnetz (2) mit Energie (8) versorgt wird und eine Energiespeichereinheit (9), über welche das Bordnetz (2) mit Energie (8) versorgbar ist, geladen wird,- mittels einer Recheneinrichtung (12) ein Wunschschubmoment (11) des Generators (7) ermittelt wird, welches einen Energiebedarf des Bordnetzes (2) sowie einen Energiebedarf der Energiespeichereinheit (9) umfasst, und mittels der Recheneinrichtung (12) das Wunschschubmoment (11) mit einem Planschubmoment des Generators (7) verglichen wird,- mittels einer Schubabschalterkennungseinrichtung (13) eine Schubabschaltung des Antriebsstrangs (3) des Kraftfahrzeugs erfasst wird,- mittels einer Steuereinrichtung (10) die Fahrdrehzahl des Antriebselements (6) über eine Schaltung des Getriebes (5) des Antriebsstrangs (3) in Abhängigkeit von dem Vergleich des Wunschschubmoments (11) mit dem Planschubmoment bei einer erfassten Schubabschaltung zur Einstellung des Wunschschubmoments (11) im Generator (7) gesteuert wird, wobei die Fahrdrehzahl des Antriebselements (6) in Abhängigkeit von einem aktuellen Schleppmoment des Antriebsstrangs (3) gesteuert wird, wobei der Energiebedarf der Energiespeichereinheit (9) in Abhängigkeit von einem Ladezustand und einem Entladevorgang der Energiespeichereinheit (9) mittels der Recheneinrichtung (12) ermittelt wird, und wobei die Fahrdrehzahl des Antriebselements (6) bei einem Ladezustand der Energiespeichereinheit (9) unterhalb eines Grenzwerts in Abhängigkeit von dem Vergleich des Wunschschubmoments (11) mit dem Planschubmoment bei der erfassten Schubabschaltung zur Einstellung des Wunschschubmoments (11) im Generator (7) gesteuert wird.Method for operating a power supply device (1) of an on-board network (2) for a motor vehicle, in which by means of a generator (7) on a drive train (3) of the motor vehicle having a transmission (5) a power via a driving speed of a drive element (6) is tapped, by means of which the electrical system (2) is supplied with energy (8) and an energy storage unit (9), via which the electrical system (2) with power (8) can be supplied, is loaded by means of a computing device (12) Desired thrust torque (11) of the generator (7) is determined, which includes an energy requirement of the electrical system (2) and an energy requirement of the energy storage unit (9), and by means of the computing device (12) the desired thrust torque (11) with a shearing thrust moment of the generator (7) is compared, by means of a Schubabschalterkennungseinrichtung (13) a fuel cut of the drive train (3) of the motor vehicle is detected, - by means of a control device (10) the driving speed of the drive element (6) via a circuit of the transmission (5) of the drive train (3) in dependence on the comparison of the desired thrust torque (11) with the transverse thrust moment at a detected fuel cut to set the desired thrust torque (11) in the generator (7) controlled wherein the driving speed of the drive element (6) is controlled as a function of a current drag torque of the drive train (3), the energy requirement of the energy storage unit (9) being dependent on a charge state and a discharge process of the energy storage unit (9) by means of the computing device (12 ) is determined, and wherein the driving speed of the drive element (6) at a state of charge of the energy storage unit (9) below a threshold value in dependence on the comparison of the desired thrust torque (11) with the shear thrust at the detected overrun fuel cut to set the desired thrust torque (11) in the generator (7) is controlled.
Description
Die Erfindung betrifft ein Verfahren zum Betreiben einer Energieversorgungseinrichtung eines Bordnetzes für ein Kraftfahrzeug.The invention relates to a method for operating a power supply device of a vehicle electrical system for a motor vehicle.
Aus der
Aus der
In der
Die
Die
Die Aufgabe der vorliegenden Erfindung ist es, eine Energieversorgung eines Bordnetzes für ein Kraftfahrzeug dauerhaft sicherzustellen.The object of the present invention is to permanently ensure a power supply of a vehicle electrical system for a motor vehicle.
Diese Aufgabe wird durch ein Verfahren zum Betreiben einer Energieversorgungseinrichtung eines Bordnetzes für ein Kraftfahrzeug mit den Merkmalen des Patentanspruchs 1 gelöst.This object is achieved by a method for operating a power supply device of a vehicle electrical system for a motor vehicle having the features of
Die Erfindung betrifft ein Verfahren zum Betreiben einer Energieversorgungseinrichtung eines Bordnetzes für ein eine Verbrennungskraftmaschine aufweisendes Kraftfahrzeug. Hierbei wird mittels eines Generators an einem ein Getriebe aufweisenden Antriebsstrang des Kraftfahrzeugs über eine Fahrdrehzahl eines Antriebselements eine Leistung abgegriffen, mittels welcher das Bordnetz mit Energie versorgt wird und eine Energiespeichereinheit geladen wird. Über die Energiespeichereinheit ist das Bordnetz mit Energie versorgbar. Mit anderen Worten wird das Bordnetz mittels der durch den Generator am Antriebselement abgegriffenen Leistung mit Energie versorgt. Darüber hinaus wird die Energiespeichereinheit mittels der durch den Generator von dem Antriebselement abgegriffenen Leistung geladen. Das Bordnetz ist sowohl direkt über die durch den Generator abgegriffene Leistung als auch über die Energiespeichereinheit mit Energie versorgbar.The invention relates to a method for operating a power supply device of a vehicle electrical system for a motor vehicle having an internal combustion engine. In this case, a power is tapped by means of a generator on a drive train of the motor vehicle having a transmission via a driving rotational speed of a drive element, by means of which the electrical system is supplied with energy and an energy storage unit is charged. About the energy storage unit, the electrical system is supplied with energy. In other words, the vehicle electrical system is supplied with energy by means of the power tapped by the generator on the drive element. In addition, the energy storage unit is charged by means of the tapped by the generator of the drive element power. The vehicle electrical system can be supplied with energy both directly via the power consumed by the generator and via the energy storage unit.
Des Weiteren wird bei dem Verfahren mittels einer Recheneinrichtung ein Wunschschubmoment des Generators ermittelt, welches einen Energiebedarf des Bordnetzes sowie einen Energiebedarf der Energiespeichereinheit umfasst, und mittels der Recheneinrichtung das Wunschschubmoment mit einem Planschubmoment des Generators verglichen. Unter dem Energiebedarf der Energiespeichereinheit ist eine Energiemenge zu verstehen, mittels welcher die Energiespeichereinheit von ihrem derzeitigen Ladezustand auf ihre Vollbeladung aufladbar ist. Bei dem Planschubmoment des Generators handelt es sich um ein Schubmoment, welches sich im Generator einstellen würde, wenn das Kraftfahrzeug derart betrieben würde, dass ein optimales Fahrverhalten des Kraftfahrzeugs erreicht werden kann. Liegt das Planschubmoment oberhalb des Wunschschubmoments oder entspricht das Wunschschubmoment dem Planschubmoment, was bedeutet, dass bei Einstellung des Planschubmoments im Generator die Versorgung des Bordnetzes und der Energiespeichereinheit mit Energie sichergestellt werden kann, so erfolgt keine Änderung der Fahrdrehzahl des Antriebselements. Wird bei dem Vergleich jedoch festgestellt, dass das Wunschschubmoment größer als das Planschubmoment ist und bei Einstellung des Planschubmoments im Generator die Versorgung des Bordnetzes und der Energiespeichereinheit mit Energie nicht gewährleistet werden kann, so wird eine Anpassung der Fahrdrehzahl des Antriebselements mittels der Steuereinrichtung bewirkt.Furthermore, in the method by means of a computing device, a desired thrust torque of the generator is determined, which comprises an energy requirement of the electrical system and an energy requirement of the energy storage unit, and compared by means of the computing device, the desired thrust torque with a shearing thrust of the generator. The energy requirement of the energy storage unit is an amount of energy by means of which the energy storage unit can be charged from its current state of charge to its full charge. The plan thrust torque of the generator is a thrust torque which would occur in the generator if the motor vehicle were operated in such a way that an optimum driving behavior of the motor vehicle can be achieved. If the transverse thrust torque is above the desired thrust torque or the desired thrust torque corresponds to the transverse thrust torque, which means that the supply of the electrical system and the energy storage unit can be ensured with energy when adjusting the transverse thrust torque in the generator, there is no change in the driving speed of the drive element. If, however, it is determined in the comparison that the desired thrust torque is greater than the planned thrust torque and the supply of the electrical system and the energy storage unit can not be guaranteed with energy when adjusting the transverse thrust torque in the generator, the driving speed of the drive element is adjusted by means of the control device.
Überdies wird mittels einer Schubabschalterkennungseinrichtung eine Schubabschaltung des Antriebsstrangs des Kraftfahrzeugs erfasst. Unter der Schubabschaltung ist ein Zustand der Verbrennungskraftmaschine des Kraftfahrzeugs zu verstehen, in welchem zumindest im Wesentlichen keine Einspritzung von Kraftstoff in die Verbrennungskraftmaschine erfolgt. Dieser Zustand der Schubabschaltung kann beispielsweise bei einer Fahrt des Kraftfahrzeugs in einem Bereich mit negativer Steigung, insbesondere bei einer Bergabfahrt, auftreten.Moreover, a fuel cut-off of the drive train of the motor vehicle is detected by means of a fuel cut-off detection device. Under the fuel cut is a state of the internal combustion engine of the motor vehicle to understand, in which at least substantially no injection of fuel into the internal combustion engine. This state of overrun fuel cutoff can occur, for example, during a drive of the motor vehicle in an area with a negative gradient, in particular when driving downhill.
Anschließend wird bei dem Verfahren mittels einer Steuereinrichtung die Fahrdrehzahl des Antriebselements über eine Schaltung des Getriebes des Antriebsstrangs in Abhängigkeit von dem Vergleich des Wunschschubmoments mit dem Planschubmoment bei einer erfassten Schubabschaltung zur Einstellung des Wunschschubmoments im Generator gesteuert. Mit anderen Worten wird mittels der Steuereinrichtung bei der erfassten Schubabschaltung das Getriebe derart geschaltet, dass die Fahrdrehzahl des Antriebselements angepasst wird und sich dadurch im Generator das Wunschschubmoment einstellt. Somit kann mittels des Generators die dem Wunschschubmoment zuordenbare Leistung im Antriebselement abgegriffen werden, mittels welcher das Bordnetz sowie gegebenenfalls die Energiespeichereinheit mit Energie versorgt wird. Über die Einstellung der Fahrdrehzahl kann somit vorteilhafterweise eine ausreichende Versorgung des Bordnetzes mit Energie gewährleistet werden.Subsequently, in the method by means of a control device, the driving speed of the drive element via a circuit of the transmission of the drive train in dependence on the comparison of the desired thrust torque with the plan thrust torque at a detected overrun fuel cut to set the desired thrust torque in the generator controlled. In other words, by means of the control device in the detected fuel cut, the transmission is switched such that the driving speed of the drive element is adjusted and thereby adjusts the desired thrust torque in the generator. Thus, by means of the generator, the power to be assigned to the desired thrust torque can be tapped in the drive element, by means of which the vehicle electrical system and optionally the energy storage unit is supplied with energy. On the setting of the driving speed can thus be advantageously ensured an adequate supply of the electrical system with energy.
Die Fahrdrehzahl des Antriebselements wird in Abhängigkeit von einem aktuellen Schleppmoment des Antriebsstrangs gesteuert. Insbesondere handelt es sich dabei um das aktuelle Schleppmoment der Verbrennungskraftmaschine. Vorteilhafterweise wird somit das aktuelle Schleppmoment der Verbrennungskraftmaschine in die Steuerung der Fahrdrehzahl mit einbezogen, so dass die Fahrdrehzahl des Antriebselements zur Einstellung des Wunschschubmoments im Generator abhängig von dem aktuellen Schleppmoment eingestellt wird.The driving speed of the drive element is controlled in dependence on a current drag torque of the drive train. In particular, this is the current drag torque of the internal combustion engine. Advantageously, therefore, the current drag torque of the internal combustion engine is included in the control of the driving speed, so that the driving speed of the drive element for setting the desired thrust torque in the generator is set depending on the current drag torque.
Der Energiebedarf der Energiespeichereinheit wird in Abhängigkeit von einem Ladezustand und einem Entladevorgang der Energiespeichereinheit mittels der Recheneinrichtung ermittelt. Beispielsweise handelt es sich bei dem Energiebedarf um eine Differenz zwischen der Vollbeladung der Energiespeichereinheit und einem aktuellen Ladezustand der Energiespeichereinheit. Alternativ oder zusätzlich wird der Energiebedarf der Energiespeichereinheit in Abhängigkeit von dem Entladevorgang der Energiespeichereinheit ermittelt, worunter zu verstehen ist, dass die von der Energiespeichereinheit an das Bordnetz abgegebene Energie erfasst wird und der Energiebedarf anhand dessen ermittelt wird. Es kann somit vorteilhafterweise gewährleistet werden, dass das Wunschschubmoment derart angepasst wird, dass in der Energiespeichereinheit besonders viel Energie gespeichert werden kann.The energy requirement of the energy storage unit is determined as a function of a charge state and a discharge process of the energy storage unit by means of the computing device. For example, the energy requirement is a difference between the full charge of the energy storage unit and a current charge state of the energy storage unit. Alternatively or additionally, the energy requirement of the energy storage unit is determined as a function of the discharging process of the energy storage unit, which means that the energy emitted by the energy storage unit to the vehicle electrical system is detected and the energy requirement is determined on the basis of this. It can thus be advantageously ensured that the desired thrust torque is adjusted so that particularly energy can be stored in the energy storage unit.
Die Fahrdrehzahl des Antriebselements wird bei einem Ladezustand der Energiespeichereinheit unterhalb eines definierten Grenzwerts in Abhängigkeit von dem Vergleich des Wunschschubmoments mit dem Planschubmoment bei der erfassten Schubabschaltung zur Einstellung des Wunschschubmoments im Generator gesteuert. Mit anderen Worten wird die Fahrdrehzahl des Antriebselements mittels der Steuereinrichtung angepasst, wenn der Ladezustand der Energiespeichereinheit den definierten Grenzwert unterschreitet. Beispielsweise wird die Fahrdrehzahl des Antriebselements nicht in Abhängigkeit von dem Wunschschubmoment gesteuert, wenn der Ladezustand der Energiespeichereinheit oberhalb des definierten Grenzwertes liegt. Das über die Fahrdrehzahl steuerbare Fahrverhalten des Kraftfahrzeugs kann in dieser vorteilhaften Ausführungsform bei einem Überschreiten des Grenzwerts durch den Ladezustand der Energiespeichereinheit an einen optimalen Fahrkomfort eines Nutzers des Kraftfahrzeugs angepasst werden. Bei einem Ladezustand der Energiespeichereinheit unterhalb des Grenzwerts kann die Fahrdrehzahl derart gesteuert werden, dass das Wunschschubmoment im Generator eingestellt wird.The driving speed of the drive element is controlled at a state of charge of the energy storage unit below a defined limit in dependence on the comparison of the desired thrust torque with the thrust load at the detected overrun fuel cut to set the desired thrust torque in the generator. In other words, the driving speed of the drive element is adjusted by means of the control device when the state of charge of the energy storage unit falls below the defined limit value. For example, the driving speed of the drive element is not controlled as a function of the desired thrust torque when the state of charge of the energy storage unit is above the defined limit value. The driving behavior of the motor vehicle, which can be controlled via the driving speed, can be adapted in this advantageous embodiment to optimum driving comfort of a user of the motor vehicle when the limit value is exceeded by the state of charge of the energy storage unit. In a state of charge of the energy storage unit below the limit, the driving speed can be controlled so that the desired thrust torque is set in the generator.
In diesem Zusammenhang hat es sich als vorteilhaft gezeigt, wenn die Fahrdrehzahl des Antriebselements in Abhängigkeit von der mittels des Generators abgegriffenen Leistung gesteuert wird. Mit anderen Worten wird die mittels des Generators abgegriffene Leistung in die Ermittlung des Wunschschubmoments mit einbezogen und die Fahrdrehzahl des Antriebselements anschließend derart gesteuert, dass das Wunschschubmoment im Generator eingestellt wird. Das Wunschschubmoment kann somit besonders genau aus der mittels des Generators abgegriffenen Leistung sowie dem Energiebedarf des Bordnetzes und der Energiespeichereinheit ermittelt werden. Folglich kann beispielsweise ein jeweiliger Wirkungsgrad des Generators mit in die Ermittlung des Wunschschubmoments einbezogen werden, da die abgegriffene Leistung des Generators und somit eine real von dem Antriebselement abgegriffene Leistung, mit der das Bordnetz und die Energiespeichereinheit versorgbar sind, ermittelt und in die Erstellung des Wunschschubmoments mit einbezogen werden.In this context, it has proved to be advantageous if the driving speed of the drive element is controlled in dependence on the power tapped by means of the generator. In other words, the means of the generator tapped power included in the determination of the desired thrust torque and the driving speed of the drive element then controlled such that the desired thrust torque is set in the generator. The desired thrust torque can thus be determined particularly accurately from the tapped by the generator power and the energy requirements of the electrical system and the energy storage unit. Consequently, for example, a respective efficiency of the generator can be included in the determination of the desired thrust torque, since the tapped power of the generator and thus a real tapped by the drive element power with which the electrical system and the energy storage unit can be supplied, determined and in the creation of the desired thrust torque be included.
Im Folgenden sind Ausführungsbeispiele der Erfindung beschrieben. Hierzu zeigt die einzige Figur eine schematische Darstellung einer Energieversorgungseinrichtung für ein Bordnetz eines Kraftfahrzeugs mit einem eine Verbrennungskraftmaschine, ein Antriebselement sowie ein Getriebe aufweisenden Antriebsstrang, eine Recheneinrichtung, eine Schubabschalterkennungseinrichtung sowie eine Steuereinrichtung.In the following, embodiments of the invention are described. For this purpose, the single FIGURE shows a schematic representation of a power supply device for an electrical system of a motor vehicle with a drive train having an internal combustion engine, a drive element and a transmission, a computing device, a Schubabschalterkennungseinrichtung and a control device.
In der einzigen Figur sind funktionsgleiche Elemente jeweils mit denselben Bezugszeichen versehen.In the single figure functionally identical elements are each provided with the same reference numerals.
In der einzigen Figur ist eine Energieversorgungseinrichtung
Zur Sicherstellung einer ausreichenden Energieversorgung des Bordnetzes
Von der Verbrennungskraftmaschine
Die Steuereinrichtung
Bei einer Schaltstrategie eines Automatikgetriebes von aktuellen automatisch schaltbaren Kraftfahrzeugen wird normalerweise nicht berücksichtigt, ob der Generator
Die im Zusammenhang mit der einzigen Figur beschriebene Energieversorgungseinrichtung
Zur Gewährleistung der ausreichenden Versorgung des Bordnetzes
Insgesamt zeigen die Beispiele, wie durch die Erfindung ein elektrischer Schubwunsch im Generator
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