EP2922720A1 - Hydraulic hybrid drivetrain and method for operating a hydraulic hybrid drivetrain - Google Patents

Hydraulic hybrid drivetrain and method for operating a hydraulic hybrid drivetrain

Info

Publication number
EP2922720A1
EP2922720A1 EP13786506.9A EP13786506A EP2922720A1 EP 2922720 A1 EP2922720 A1 EP 2922720A1 EP 13786506 A EP13786506 A EP 13786506A EP 2922720 A1 EP2922720 A1 EP 2922720A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
internal combustion
combustion engine
generator
electric starter
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Withdrawn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
EP13786506.9A
Other languages
German (de)
French (fr)
Inventor
Andreas Beiter
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.)
Robert Bosch GmbH
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
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2922720A1 publication Critical patent/EP2922720A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/08—Prime-movers comprising combustion engines and mechanical or fluid energy storing means
    • B60K6/12—Prime-movers comprising combustion engines and mechanical or fluid energy storing means by means of a chargeable fluidic accumulator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/40—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the assembly or relative disposition of components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/08—Prime-movers comprising combustion engines and mechanical or fluid energy storing means
    • B60K6/12—Prime-movers comprising combustion engines and mechanical or fluid energy storing means by means of a chargeable fluidic accumulator
    • B60K2006/126—Prime-movers comprising combustion engines and mechanical or fluid energy storing means by means of a chargeable fluidic accumulator the hydraulic accumulator starts the engine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/26—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the motors or the generators
    • B60K2006/268—Electric drive motor starts the engine, i.e. used as starter motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K25/00—Auxiliary drives
    • B60K25/02—Auxiliary drives directly from an engine shaft
    • B60K2025/026—Auxiliary drives directly from an engine shaft by a hydraulic transmission
    • 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
    • B60W10/101—Infinitely variable gearings
    • B60W10/103—Infinitely variable gearings of fluid type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H47/00—Combinations of mechanical gearing with fluid clutches or fluid gearing
    • F16H47/02—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the volumetric type
    • 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
    • Y02T10/62—Hybrid vehicles

Definitions

  • the invention relates to a hydraulic hybrid powertrain having an internal combustion engine and a hydraulic drive device, and to an electric starter / generator for the internal combustion engine drive device.
  • the invention further relates to a method of operating such a hydraulic hybrid powertrain.
  • the electric starter / generator is powered, for example, from an in-vehicle electrical energy storage device, such as a battery, with electrical energy. With the electrical energy, a torque required to start the internal combustion engine drive means may be provided by the electric starter / generator.
  • the starter / generator also serves to supply an electrical system and / or other electrical consumers.
  • the object of the invention is to optimize the operation of a Hydraulikhybridantriebsstrangs according to the preamble of claim 1.
  • the object is achieved in a hydraulic hybrid drive train with an internal combustion engine and a hydraulic drive device, and with an electric starter / generator for the internal combustion engine drive device, characterized in that the electric starter / generator for the internal combustion engine drive device of the hydraulic drive device to is ordered.
  • the electric starter / generator may be mounted directly on the internal combustion engine drive device.
  • this provides the disadvantage that the internal combustion engine drive device must be turned on when an in-vehicle electrical energy storage device must be charged via the preferably designed as a generator electric starter, because their state of charge is low.
  • the assignment according to the invention of the electric starter which is preferably designed as an electric generator, provides the advantage that the electrical energy storage device can be charged via the hydraulic drive device and the electric starter.
  • recuperation operation is made possible in which braking energy of the hydraulic hybrid powertrain can be stored in the electrical energy storage device via the electric starter designed as a generator.
  • recuperation operation both a hydraulic pressure accumulator of the hydraulic drive device and the vehicle-internal electrical energy storage device can advantageously be charged.
  • the hydraulic drive device in particular a second hydrostatic drive of the hydraulic drive device, can be operated in operating-efficiency-favorable operating points.
  • the inventive assignment of the electric starter / generator also provides the advantage that the vehicle-internal electrical energy storage device, which is also referred to as an electric battery, can be loaded from a hydraulic pressure accumulator of the hydraulic drive device.
  • the internal combustion engine drive device is only required for charging the electrical energy storage device when the hydraulic hybrid drive train or a hybrid vehicle equipped therewith is stationary and the hydraulic pressure accumulator is empty. This has a positive effect on the fuel consumption of the internal combustion engine drive device.
  • a preferred embodiment of the hydraulic hybrid powertrain is characterized in that the electric starter / generator for the internal combustion engine drive means is mechanically coupled to the hydraulic drive means.
  • the electric starter / generator is mechanically preferably with a shaft of a hydraulic machine of the hydraulic
  • both a torque from the hydraulic drive means to the electric starter / generator and from the electric starter / generator can be transmitted to the hydraulic drive means.
  • the electric starter / generator is mechanically preferably connected to the hydraulic drive device.
  • the inventive assignment of the electric starter / generator is also made possible to charge a hydraulic pressure accumulator of the hydraulic drive means via the electric starter / generator by means of electrical energy from the electric energy storage device.
  • Another preferred exemplary embodiment of the hydraulic hybrid drive train is characterized in that the electric starter / generator for the internal combustion engine drive device can be hydraulically coupled with the internal combustion engine drive device and / or a driven axle.
  • the mechanical coupling with the driven axle enables the previously described recovery of braking energy in the recuperation mode.
  • Another preferred exemplary embodiment of the hybrid hydraulic drive train is characterized in that the electric starter / generator for the internal combustion engine drive device is connected between the hydraulic drive device and a clutch via which the hydraulic drive device can be coupled to the driven axle.
  • the coupling is preferably designed as a separating clutch. When the clutch is closed, then the hydraulic drive means is non-rotatably connected to the driven axle. When the clutch is open, the non-rotatable connection to the driven axle is interrupted.
  • a further preferred exemplary embodiment of the hydraulic hybrid drive train is characterized in that a transmission device is connected between the clutch and the driven axle.
  • the transmission device is, for example, a transmission stage.
  • Another preferred exemplary embodiment of the hydraulic hybrid drive train is characterized in that the internal combustion engine drive device is coupled to the hydraulic drive device and the driven axle or the transmission device via a transmission.
  • the transmission is preferably designed as a planetary gear. Another coupling can be advantageously integrated in the planetary gear.
  • Another preferred exemplary embodiment of the hydraulic hybrid drive train is characterized in that a further clutch is connected between the transmission and the driven axle or the transmission device.
  • the further clutch is preferably also designed as a disconnect clutch.
  • the internal combustion engine drive means can be mechanically decoupled from the driven axle.
  • a further preferred exemplary embodiment of the hydraulic hybrid drive train is characterized in that the hydraulic drive device comprises two hydrostatic drives.
  • Hydrostatic refers to hydraulic machines that function both as a hydraulic motor and as a hydraulic pump.
  • the hydraulic machines are, for example, axial piston machines.
  • a further preferred exemplary embodiment of the hydraulic hybrid drive train is characterized in that the electric starter / generator for the internal combustion engine drive device is assigned to a second hydrostatic unit, which in turn is assigned to the driven axle.
  • a first hydrostat is associated, preferably with the interposition of the transmission, the internal combustion engine drive means.
  • the first hydrostat acts, for example, as a hydraulic pump, via which one or the hydraulic accumulator of the hydraulic drive device can be charged.
  • the second Hydrostat then acts as a hydraulic motor, via which the driven axle can be driven with hydraulic energy from the hydraulic pressure accumulator or hydraulic energy storage.
  • the invention further relates to a method of operating a hydraulic hybrid powertrain as described above.
  • the inventive method allows, for example, a recuperation, in which both an electrical energy storage device, such as an electric battery, and a hydraulic energy storage or accumulator can be charged in overrun operation of the hydraulic hybrid powertrain.
  • an electrical energy storage device such as an electric battery
  • a hydraulic energy storage or accumulator can be charged in overrun operation of the hydraulic hybrid powertrain.
  • the electrical energy storage device in particular one or the second hydrostat, which is assigned to the driven axle, can be operated in operating-efficiency-favorable operating points.
  • the electrical energy storage device can be charged from the hydraulic energy storage or accumulator, and vice versa.
  • the internal combustion engine drive device is advantageously required for charging the electrical energy storage device only when a hydraulic hybrid vehicle equipped with the hydraulic hybrid drive train is in standstill and the hydraulic energy store or accumulator is empty. This results in advantages in the fuel consumption of the internal combustion engine drive device.
  • a hydraulic hybrid powertrain 1 with a driven axle 3 is shown in simplified form.
  • the driven axle 3 is provided with two driven wheels 4, 5, which are driven by a differential 6.
  • the differential 6 is designed as a differential gear, the speed differences of the driven wheels 4, 5 balances in curves and a drive torque evenly distributed to the driven wheels 4, 5.
  • the hydraulic hybrid powertrain 1 includes an internal combustion engine drive device 10 and a hydraulic drive device 20.
  • Engine power drive device 10 is designed as an internal combustion engine and is also referred to as an internal combustion engine.
  • the hydraulic drive device 20 comprises a first hydrostatic drive 21 and a second hydrostatic drive 22.
  • the two hydrostats 21, 22 are each designed as a hydraulic machine, which can be operated both as a hydraulic pump and as a hydraulic motor.
  • the two hydrostats 21, 22 may be designed, for example, as hydraulic axial piston machines.
  • the hydraulic drive device 20 further comprises a valve device 24, which comprises a plurality of valves, which are not shown in detail.
  • the hydraulic drive device 20 further comprises a hydraulic energy store 25, which is designed as a high-pressure accumulator.
  • the hydraulic drive device 20 further comprises a hydraulic energy store 26, which is designed as a low-pressure accumulator.
  • Simple lines between the valve device 24 and the hydrostats 21, 22 and the hydraulic energy accumulators 25, 26 indicate that the hydraulic components 21 to 26 are hydraulically connected to one another.
  • a plurality of hydraulic lines and a plurality of hydraulic valves are required, the structure and function are known in principle but. Therefore, these hydraulic components will not be described in detail here.
  • a transmission 30 is connected between the internal combustion engine drive device 10 and the first hydrostats 21.
  • a mechanical coupling 31 between the gear 30 and the first hydrostatic 21 is indicated.
  • a mechanical coupling 32 between the transmission 30 and a transmission device 35 is indicated.
  • a clutch 40 is arranged between the gear 30 and the transmission device 35.
  • the transmission 30 is designed as a planetary gear. Another unspecified coupling is advantageously integrated in the planetary gear 30.
  • the transmission device 35 is a translation stage.
  • a mechanical coupling 45 between the second Hydrostaten 22 and the transmission device 35 is indicated.
  • An electric starter / generator 50 is mechanically coupled to the second hydrostatic unit 22 by the mechanical coupling 45.
  • the mechanical coupling 45 can be designed as a translation stage.
  • the electric starter 50 is designed as an electric generator and electrically connected to an (not shown) electrical energy storage device, which is also referred to as an electric battery.
  • the first hydrostat 21 functions, for example, as a hydraulic pump that is driven by the engine 30 via the transmission 30. Then the first hydrostatic pump 21 pumps hydraulic medium from the
  • the second hydrostat 22 can be hydraulically driven by the high-pressure hydraulic medium in the high-pressure accumulator 25 in its engine function.
  • the hydraulic drive power of the second hydrostatic unit 22 is transmitted via the transmission device 35 and the differential 6 to the driven wheels 4, 5.
  • braking energy can be transmitted from the wheels 4, 5 via the differential 6 and the transmission device 35 to the electric starter 50 and via the second hydrostat 22 to the high-pressure accumulator 25.
  • the recovered braking energy can thus be stored both electrically and hydraulically.
  • the electric starter / generator 50 may be electrically operated to start the internal combustion engine drive device 10.
  • a torque provided by the electric starter / generator 50 can be transmitted to the internal combustion engine drive device 10 with the clutches 40 and 60 open via the hydraulic drive device 20 and the transmission 30.

Abstract

The invention relates to a hydraulic hybrid drivetrain (1) with an internal combustion engine drive apparatus (10) and a hydraulic drive apparatus (20) and with an electric starter/generator (50) for the internal combustion engine drive apparatus (10). In order to optimise the operation of a hydraulic hybrid drivetrain, the electric starter/generator (50) for the internal combustion engine drive apparatus (10) is assigned to the hydraulic drive apparatus (20).

Description

Beschreibung Titel  Description title
Hydraulikhybridantriebsstrang und Verfahren zum Betreiben eines Hydraulikhyb- ridantriebsstrangs  Hydraulic hybrid powertrain and method of operating a hydraulic hybrid powertrain
Die Erfindung betrifft einen Hydraulikhybridantriebsstrang mit einer verbrennungsmotorischen und einer hydraulischen Antriebseinrichtung, und mit einem elektrischen Starter/Generator für die verbrennungsmotorische Antriebseinrichtung. Die Erfindung betrifft des Weiteren ein Verfahren zum Betreiben eines derartigen Hydraulikhybridantriebsstrangs. The invention relates to a hydraulic hybrid powertrain having an internal combustion engine and a hydraulic drive device, and to an electric starter / generator for the internal combustion engine drive device. The invention further relates to a method of operating such a hydraulic hybrid powertrain.
Stand der Technik State of the art
Der elektrische Starter/Generator wird zum Beispiel aus einer fahrzeuginternen elektrischen Energiespeichereinrichtung, wie einer Batterie, mit elektrischer Energie versorgt. Mit der elektrischen Energie kann durch den elektrischen Starter/Generator ein zum Starten der verbrennungsmotorischen Antriebseinrichtung benötigtes Drehmoment bereitgestellt werden. Der Starter/Generator dient darüber hinaus zur Versorgung eines elektrischen Bordnetzes und/oder weiterer elektrischer Verbraucher. The electric starter / generator is powered, for example, from an in-vehicle electrical energy storage device, such as a battery, with electrical energy. With the electrical energy, a torque required to start the internal combustion engine drive means may be provided by the electric starter / generator. The starter / generator also serves to supply an electrical system and / or other electrical consumers.
Offenbarung der Erfindung Disclosure of the invention
Aufgabe der Erfindung ist es, den Betrieb eines Hydraulikhybridantriebsstrangs gemäß dem Oberbegriff des Anspruchs 1 zu optimieren. The object of the invention is to optimize the operation of a Hydraulikhybridantriebsstrangs according to the preamble of claim 1.
Die Aufgabe ist bei einem Hydraulikhybridantriebsstrang mit einer verbrennungsmotorischen und einer hydraulischen Antriebseinrichtung, und mit einem elektrischen Starter/Generator für die verbrennungsmotorische Antriebseinrichtung, dadurch gelöst, dass der elektrische Starter/Generator für die verbrennungsmotorische Antriebseinrichtung der hydraulischen Antriebseinrichtung zu- geordnet ist. Der elektrische Starter/Generator kann direkt an der verbrennungsmotorischen Antriebseinrichtung angebracht sein. Allerdings liefert das den Nachteil, dass die verbrennungsmotorische Antriebseinrichtung angeschaltet werden muss, wenn eine fahrzeuginterne elektrische Energiespeichereinrichtung über den vorzugsweise als Generator ausgeführten elektrischen Starter aufgeladen werden muss, weil ihr Ladezustand niedrig ist. Die erfindungsgemäße Zuordnung des elektrischen Starters, der vorzugsweise als elektrischer Generator ausgeführt ist, liefert den Vorteil, dass die elektrische Energiespeichereinrichtung über die hydraulische Antriebseinrichtung und den elektrischen Starter aufgela- den werden kann. Darüber hinaus wird, zum Beispiel im Schubbetrieb des Hyd- raulikhybridantriebsstrangs, ein Rekuperationsbetrieb ermöglicht, in welchem Bremsenergie des Hydraulikhybridantriebsstrangs über den als Generator ausgeführten elektrischen Starter in der elektrischen Energiespeichereinrichtung gespeichert werden kann. Im Rekuperationsbetrieb können vorteilhaft sowohl ein hydraulischer Druckspeicher der hydraulischen Antriebseinrichtung als auch die fahrzeuginterne elektrische Energiespeichereinrichtung aufgeladen werden. Durch das zusätzliche Aufladen der elektrischen Energiespeichereinrichtung über den elektrischen Starter/Generator kann die hydraulische Antriebseinrichtung, insbesondere ein zweiter Hydrostat der hydraulischen Antriebseinrichtung, in wir- kungsgradgünstigeren Betriebspunkten betrieben werden. Die erfindungsgemäße Zuordnung des elektrischen Starters/Generator liefert darüber hinaus den Vorteil, dass die fahrzeuginterne elektrische Energiespeichereinrichtung, die auch als elektrische Batterie bezeichnet wird, aus einem hydraulischen Druckspeicher der hydraulischen Antriebseinrichtung geladen werden kann. Das be- deutet, dass die verbrennungsmotorische Antriebseinrichtung erst dann zum Laden der elektrischen Energiespeichereinrichtung benötigt wird, wenn der Hydrau- likhybridantriebsstrang beziehungsweise ein damit ausgestattetes Hybridfahrzeug steht und der hydraulische Druckspeicher leer ist. Das wirkt sich positiv im Kraftstoffverbrauch der verbrennungsmotorischen Antriebseinrichtung aus. The object is achieved in a hydraulic hybrid drive train with an internal combustion engine and a hydraulic drive device, and with an electric starter / generator for the internal combustion engine drive device, characterized in that the electric starter / generator for the internal combustion engine drive device of the hydraulic drive device to is ordered. The electric starter / generator may be mounted directly on the internal combustion engine drive device. However, this provides the disadvantage that the internal combustion engine drive device must be turned on when an in-vehicle electrical energy storage device must be charged via the preferably designed as a generator electric starter, because their state of charge is low. The assignment according to the invention of the electric starter, which is preferably designed as an electric generator, provides the advantage that the electrical energy storage device can be charged via the hydraulic drive device and the electric starter. In addition, for example, in overrun operation of the hydraulic hybrid powertrain, a recuperation operation is made possible in which braking energy of the hydraulic hybrid powertrain can be stored in the electrical energy storage device via the electric starter designed as a generator. In recuperation operation, both a hydraulic pressure accumulator of the hydraulic drive device and the vehicle-internal electrical energy storage device can advantageously be charged. As a result of the additional charging of the electrical energy storage device via the electric starter / generator, the hydraulic drive device, in particular a second hydrostatic drive of the hydraulic drive device, can be operated in operating-efficiency-favorable operating points. The inventive assignment of the electric starter / generator also provides the advantage that the vehicle-internal electrical energy storage device, which is also referred to as an electric battery, can be loaded from a hydraulic pressure accumulator of the hydraulic drive device. This means that the internal combustion engine drive device is only required for charging the electrical energy storage device when the hydraulic hybrid drive train or a hybrid vehicle equipped therewith is stationary and the hydraulic pressure accumulator is empty. This has a positive effect on the fuel consumption of the internal combustion engine drive device.
Ein bevorzugtes Ausführungsbeispiel des Hydraulikhybridantriebsstrangs ist dadurch gekennzeichnet, dass der elektrische Starter/Generator für die verbrennungsmotorische Antriebseinrichtung mechanisch mit der hydraulischen Antriebseinrichtung gekoppelt ist. Der elektrische Starter/Generator ist mechanisch vorzugsweise mit einer Welle einer hydraulischen Maschine der hydraulischenA preferred embodiment of the hydraulic hybrid powertrain is characterized in that the electric starter / generator for the internal combustion engine drive means is mechanically coupled to the hydraulic drive means. The electric starter / generator is mechanically preferably with a shaft of a hydraulic machine of the hydraulic
Antriebseinrichtung verbunden. Durch die mechanische Kopplung, die zum Bei- spiel als drehfeste Verbindung oder als Ubersetzungsstufe ausgeführt ist, kann sowohl ein Drehmoment von der hydraulischen Antriebseinrichtung auf den elektrischen Starter/Generator als auch von dem elektrischen Starter/Generator auf die hydraulische Antriebseinrichtung übertragen werden. Der elektrische Starter/Generator ist mechanisch vorzugsweise mit der hydraulischen Antriebseinrichtung verbunden. Die Kopplung mit der verbrennungsmotorischen Antriebseinrichtung erfolgt über den hydraulischen Antriebsstrang. Durch die erfindungsgemäße Zuordnung des elektrischen Starters/Generators wird darüber hinaus ermöglicht, einen hydraulischen Druckspeicher der hydraulischen Antriebseinrichtung über den elektrischen Starter/Generator mit Hilfe von elektrischer Energie aus der elektrischen Energiespeichereinrichtung aufzuladen. Drive device connected. Due to the mechanical coupling, which play is designed as a rotationally fixed connection or as a translation stage, both a torque from the hydraulic drive means to the electric starter / generator and from the electric starter / generator can be transmitted to the hydraulic drive means. The electric starter / generator is mechanically preferably connected to the hydraulic drive device. The coupling with the internal combustion engine drive means via the hydraulic drive train. The inventive assignment of the electric starter / generator is also made possible to charge a hydraulic pressure accumulator of the hydraulic drive means via the electric starter / generator by means of electrical energy from the electric energy storage device.
Ein weiteres bevorzugtes Ausführungsbeispiel des Hydraulikhybridantriebs- strangs ist dadurch gekennzeichnet, dass der elektrische Starter/Generator für die verbrennungsmotorische Antriebseinrichtung hydraulisch mit der verbrennungsmotorischen Antriebseinrichtung und/oder einer angetriebenen Achse mechanisch koppelbar ist. Die mechanische Kopplung mit der angetriebenen Achse ermöglicht die vorab beschriebene Zurückgewinnung von Bremsenergie im Rekuperationsbetrieb. Another preferred exemplary embodiment of the hydraulic hybrid drive train is characterized in that the electric starter / generator for the internal combustion engine drive device can be hydraulically coupled with the internal combustion engine drive device and / or a driven axle. The mechanical coupling with the driven axle enables the previously described recovery of braking energy in the recuperation mode.
Ein weiteres bevorzugtes Ausführungsbeispiel des Hydraulikhybridantriebs- strangs ist dadurch gekennzeichnet, dass der elektrische Starter/Generator für die verbrennungsmotorische Antriebseinrichtung zwischen die hydraulische Antriebseinrichtung und eine Kupplung geschaltet ist, über welche die hydraulische Antriebseinrichtung mit der angetriebenen Achse koppelbar ist. Die Kupplung ist vorzugsweise als Trennkupplung ausgeführt. Wenn die Kupplung geschlossen ist, dann ist die hydraulische Antriebseinrichtung drehfest mit der angetriebenen Achse verbunden. Bei geöffneter Kupplung ist die drehfeste Verbindung zur angetriebenen Achse unterbrochen. Another preferred exemplary embodiment of the hybrid hydraulic drive train is characterized in that the electric starter / generator for the internal combustion engine drive device is connected between the hydraulic drive device and a clutch via which the hydraulic drive device can be coupled to the driven axle. The coupling is preferably designed as a separating clutch. When the clutch is closed, then the hydraulic drive means is non-rotatably connected to the driven axle. When the clutch is open, the non-rotatable connection to the driven axle is interrupted.
Ein weiteres bevorzugtes Ausführungsbeispiel des Hydraulikhybridantriebs- strangs ist dadurch gekennzeichnet, dass eine Getriebeeinrichtung zwischen die Kupplung und die angetriebene Achse geschaltet ist. Bei der Getriebeeinrichtung handelt es sich zum Beispiel um eine Übersetzungsstufe. Ein weiteres bevorzugtes Ausführungsbeispiel des Hydraulikhybridantriebs- strangs ist dadurch gekennzeichnet, dass die verbrennungsmotorische Antriebseinrichtung über ein Getriebe mit der hydraulischen Antriebseinrichtung und der angetriebenen Achse beziehungsweise der Getriebeeinrichtung gekoppelt ist. Das Getriebe ist vorzugsweise als Planetengetriebe ausgeführt. Eine weitere Kupplung kann vorteilhaft in das Planetengetriebe integriert sein. A further preferred exemplary embodiment of the hydraulic hybrid drive train is characterized in that a transmission device is connected between the clutch and the driven axle. The transmission device is, for example, a transmission stage. Another preferred exemplary embodiment of the hydraulic hybrid drive train is characterized in that the internal combustion engine drive device is coupled to the hydraulic drive device and the driven axle or the transmission device via a transmission. The transmission is preferably designed as a planetary gear. Another coupling can be advantageously integrated in the planetary gear.
Ein weiteres bevorzugtes Ausführungsbeispiel des Hydraulikhybridantriebs- strangs ist dadurch gekennzeichnet, dass eine weitere Kupplung zwischen das Getriebe und die angetriebene Achse beziehungsweise die Getriebeeinrichtung geschaltet ist. Die weitere Kupplung ist vorzugsweise ebenfalls als Trennkupplung ausgeführt. Über die weitere Kupplung kann die verbrennungsmotorische Antriebseinrichtung mechanisch von der angetriebenen Achse entkoppelt werden. Another preferred exemplary embodiment of the hydraulic hybrid drive train is characterized in that a further clutch is connected between the transmission and the driven axle or the transmission device. The further clutch is preferably also designed as a disconnect clutch. About the further clutch, the internal combustion engine drive means can be mechanically decoupled from the driven axle.
Ein weiteres bevorzugtes Ausführungsbeispiel des Hydraulikhybridantriebs- strangs ist dadurch gekennzeichnet, dass die hydraulische Antriebseinrichtung zwei Hydrostaten umfasst. Als Hydrostat werden hydraulische Maschinen bezeichnet, die sowohl als hydraulischer Motor als auch als hydraulische Pumpe funktionieren. Bei den hydraulischen Maschinen handelt es sich zum Beispiel um Axialkolbenmaschinen. A further preferred exemplary embodiment of the hydraulic hybrid drive train is characterized in that the hydraulic drive device comprises two hydrostatic drives. Hydrostatic refers to hydraulic machines that function both as a hydraulic motor and as a hydraulic pump. The hydraulic machines are, for example, axial piston machines.
Ein weiteres bevorzugtes Ausführungsbeispiel des Hydraulikhybridantriebs- strangs ist dadurch gekennzeichnet, dass der elektrische Starter/Generator für die verbrennungsmotorische Antriebseinrichtung einem zweiten Hydrostaten zugeordnet ist, der wiederum der angetriebenen Achse zugeordnet ist. Ein erster Hydrostat ist, vorzugsweise unter Zwischenschaltung des Getriebes, der verbrennungsmotorischen Antriebseinrichtung zugeordnet. Dabei wirkt der erste Hydrostat zum Beispiel als hydraulische Pumpe, über die ein beziehungsweise der hydraulische Druckspeicher der hydraulischen Antriebseinrichtung aufgeladen werden kann. Der zweite Hydrostat wirkt dann als hydraulischer Motor, über den die angetriebene Achse mit hydraulischer Energie aus dem hydraulischen Druckspeicher oder hydraulischen Energiespeicher angetrieben werden kann. A further preferred exemplary embodiment of the hydraulic hybrid drive train is characterized in that the electric starter / generator for the internal combustion engine drive device is assigned to a second hydrostatic unit, which in turn is assigned to the driven axle. A first hydrostat is associated, preferably with the interposition of the transmission, the internal combustion engine drive means. In this case, the first hydrostat acts, for example, as a hydraulic pump, via which one or the hydraulic accumulator of the hydraulic drive device can be charged. The second Hydrostat then acts as a hydraulic motor, via which the driven axle can be driven with hydraulic energy from the hydraulic pressure accumulator or hydraulic energy storage.
Die Erfindung betrifft des Weiteren ein Verfahren zum Betreiben eines vorab beschriebenen Hydraulikhybridantriebsstrangs. Das erfindungsgemäße Verfahren ermöglicht zum Beispiel einen Rekuperationsbetrieb, in welchem sowohl eine elektrische Energiespeichereinrichtung, wie eine elektrische Batterie, als auch ein hydraulischer Energiespeicher beziehungsweise Druckspeicher im Schubbetrieb des Hydraulikhybridantriebsstrangs aufgeladen werden kann. Durch das Aufladen der elektrischen Energiespeichereinrichtung kann insbesondere ein beziehungsweise der zweite Hydrostat, welcher der angetriebenen Achse zugeordnet ist, in wirkungsgradgünstigeren Betriebspunkten betrieben werden. Darüber hinaus kann die elektrische Energiespeichereinrichtung aus dem hydraulischen Energiespeicher beziehungsweise Druckspeicher geladen werden, und umgekehrt. Die verbrennungsmotorische Antriebseinrichtung wird zum Aufladen der elektrischen Energiespeichereinrichtung vorteilhaft erst dann benötigt, wenn ein mit dem Hydraulikhybridantriebsstrang ausgestattetes Hydraulikhybridfahrzeug steht und der hydraulische Energiespeicher beziehungsweise Druckspeicher leer ist. Daraus ergeben sich Vorteile im Kraftstoffverbrauch der verbrennungsmotorischen Antriebseinrichtung. The invention further relates to a method of operating a hydraulic hybrid powertrain as described above. The inventive method allows, for example, a recuperation, in which both an electrical energy storage device, such as an electric battery, and a hydraulic energy storage or accumulator can be charged in overrun operation of the hydraulic hybrid powertrain. By charging the electrical energy storage device, in particular one or the second hydrostat, which is assigned to the driven axle, can be operated in operating-efficiency-favorable operating points. In addition, the electrical energy storage device can be charged from the hydraulic energy storage or accumulator, and vice versa. The internal combustion engine drive device is advantageously required for charging the electrical energy storage device only when a hydraulic hybrid vehicle equipped with the hydraulic hybrid drive train is in standstill and the hydraulic energy store or accumulator is empty. This results in advantages in the fuel consumption of the internal combustion engine drive device.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung ein Ausführungsbeispiel im Einzelnen beschrieben ist. Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, an embodiment is described in detail.
Kurze Beschreibung der Zeichnung Short description of the drawing
In der einzigen beiliegenden Figur ist ein erfindungsgemäßer Hydraulikhybridantriebsstrang vereinfacht dargestellt. In the single accompanying figure, a hydraulic hybrid power train according to the invention is shown in simplified form.
Beschreibung des Ausführungsbeispiels Description of the embodiment
In der beiliegenden Figur ist ein Hydraulikhybridantriebsstrang 1 mit einer angetriebenen Achse 3 vereinfacht dargestellt. Die angetriebene Achse 3 ist mit zwei angetriebenen Rädern 4, 5 versehen, die über ein Differenzial 6 angetrieben werden. Das Differenzial 6 ist als Ausgleichsgetriebe ausgeführt, das Drehzahlunterschiede der angetriebenen Räder 4, 5 in Kurven ausgleicht und ein Antriebsmoment gleichmäßig auf die angetriebenen Räder 4, 5 verteilt. In the accompanying figure, a hydraulic hybrid powertrain 1 with a driven axle 3 is shown in simplified form. The driven axle 3 is provided with two driven wheels 4, 5, which are driven by a differential 6. The differential 6 is designed as a differential gear, the speed differences of the driven wheels 4, 5 balances in curves and a drive torque evenly distributed to the driven wheels 4, 5.
Der Hydraulikhybridantriebsstrang 1 umfasst eine verbrennungsmotorische Antriebseinrichtung 10 und eine hydraulische Antriebseinrichtung 20. Die verbren- nungsmotorische Antriebseinrichtung 10 ist als Brennkraftmaschine ausgeführt und wird auch als Verbrennungsmotor bezeichnet. Die hydraulische Antriebseinrichtung 20 umfasst einen ersten Hydrostaten 21 und einen zweiten Hydrostaten 22. The hydraulic hybrid powertrain 1 includes an internal combustion engine drive device 10 and a hydraulic drive device 20. Engine power drive device 10 is designed as an internal combustion engine and is also referred to as an internal combustion engine. The hydraulic drive device 20 comprises a first hydrostatic drive 21 and a second hydrostatic drive 22.
Die beiden Hydrostaten 21 , 22 sind jeweils als hydraulische Maschine ausgeführt, die sowohl als hydraulische Pumpe als auch als hydraulischer Motor betrieben werden kann. Dabei können die beiden Hydrostaten 21 , 22 zum Beispiel als hydraulische Axialkolbenmaschinen ausgeführt sein. The two hydrostats 21, 22 are each designed as a hydraulic machine, which can be operated both as a hydraulic pump and as a hydraulic motor. The two hydrostats 21, 22 may be designed, for example, as hydraulic axial piston machines.
Die hydraulische Antriebseinrichtung 20 umfasst des Weiteren eine Ventileinrichtung 24, die mehrere Ventile umfasst, die im Einzelnen nicht dargestellt sind. Die hydraulische Antriebseinrichtung 20 umfasst des Weiteren einen hydraulischen Energiespeicher 25, der als Hochdruckspeicher ausgeführt ist. Die hydraulische Antriebseinrichtung 20 umfasst des Weiteren einen hydraulischen Energiespeicher 26, der als Niederdruckspeicher ausgeführt ist. The hydraulic drive device 20 further comprises a valve device 24, which comprises a plurality of valves, which are not shown in detail. The hydraulic drive device 20 further comprises a hydraulic energy store 25, which is designed as a high-pressure accumulator. The hydraulic drive device 20 further comprises a hydraulic energy store 26, which is designed as a low-pressure accumulator.
Durch einfache Linien zwischen der Ventileinrichtung 24 und den Hydrostaten 21 , 22 sowie den hydraulischen Energiespeichern 25, 26 ist angedeutet, dass die genannten Hydraulikkomponenten 21 bis 26 hydraulisch miteinander verbunden sind. Zu diesem Zweck sind, anders als dargestellt, eine Vielzahl von hydraulischen Leitungen sowie eine Vielzahl von hydraulischen Ventilen erforderlich, deren Aufbau und Funktion prinzipiell aber bekannt sind. Daher werden diese Hydraulikkomponenten im Einzelnen hier nicht näher beschrieben. Simple lines between the valve device 24 and the hydrostats 21, 22 and the hydraulic energy accumulators 25, 26 indicate that the hydraulic components 21 to 26 are hydraulically connected to one another. For this purpose, unlike the illustrated, a plurality of hydraulic lines and a plurality of hydraulic valves are required, the structure and function are known in principle but. Therefore, these hydraulic components will not be described in detail here.
Ein Getriebe 30 ist zwischen die verbrennungsmotorische Antriebseinrichtung 10 und den ersten Hydrostaten 21 geschaltet. Durch einen Doppelstrich ist eine mechanische Kopplung 31 zwischen dem Getriebe 30 und dem ersten Hydrostaten 21 angedeutet. Durch einen weiteren Doppelstrich ist eine mechanische Kopplung 32 zwischen dem Getriebe 30 und einer Getriebeeinrichtung 35 angedeutet. Zwischen dem Getriebe 30 und der Getriebeeinrichtung 35 ist eine Kupplung 40 angeordnet. A transmission 30 is connected between the internal combustion engine drive device 10 and the first hydrostats 21. By a double line, a mechanical coupling 31 between the gear 30 and the first hydrostatic 21 is indicated. By a further double line, a mechanical coupling 32 between the transmission 30 and a transmission device 35 is indicated. Between the gear 30 and the transmission device 35, a clutch 40 is arranged.
Das Getriebe 30 ist als Planetengetriebe ausgeführt. Eine weitere, nicht näher bezeichnete Kupplung ist vorteilhaft in das Planetengetriebe 30 integriert. Bei der Getriebeeinrichtung 35 handelt es sich um eine Übersetzungsstufe. Durch einen weiteren Doppelstrich ist eine mechanische Kopplung 45 zwischen dem zweiten Hydrostaten 22 und der Getriebeeinrichtung 35 angedeutet. Ein elektrischer Starter/Generator 50 ist durch die mechanische Kopplung 45 mechanisch mit dem zweiten Hydrostaten 22 gekoppelt. Die mechanische Kopplung 45 kann als Übersetzungsstufe ausgeführt sein. The transmission 30 is designed as a planetary gear. Another unspecified coupling is advantageously integrated in the planetary gear 30. The transmission device 35 is a translation stage. By a further double line, a mechanical coupling 45 between the second Hydrostaten 22 and the transmission device 35 is indicated. An electric starter / generator 50 is mechanically coupled to the second hydrostatic unit 22 by the mechanical coupling 45. The mechanical coupling 45 can be designed as a translation stage.
Eine weitere Kupplung 60 ist zwischen dem elektrischen Starter/Generator 50 und der Getriebeeinrichtung 35 angeordnet. Der elektrische Starter 50 ist als elektrischer Generator ausgeführt und elektrisch mit einer (nicht dargestellten) elektrischen Energiespeichereinrichtung verbunden, die auch als elektrische Batterie bezeichnet wird. Another clutch 60 is disposed between the electric starter / generator 50 and the transmission device 35. The electric starter 50 is designed as an electric generator and electrically connected to an (not shown) electrical energy storage device, which is also referred to as an electric battery.
Der erste Hydrostat 21 funktioniert zum Beispiel als hydraulische Pumpe, die über das Getriebe 30 von der verbrennungsmotorischen Antriebseinrichtung 10 angetrieben wird. Dann pumpt der erste Hydrostat 21 Hydraulikmedium aus demThe first hydrostat 21 functions, for example, as a hydraulic pump that is driven by the engine 30 via the transmission 30. Then the first hydrostatic pump 21 pumps hydraulic medium from the
Niederdruckspeicher 26 in den Hochdruckspeicher 25. Low-pressure accumulator 26 in the high-pressure accumulator 25th
Der zweite Hydrostat 22 kann durch das mit Hochdruck beaufschlagte Hydraulikmedium in dem Hochdruckspeicher 25 in seiner Motorfunktion hydraulisch an- getrieben werden. Die hydraulische Antriebsleistung des zweiten Hydrostaten 22 wird über die Getriebeeinrichtung 35 und das Differenzial 6 auf die angetriebenen Räder 4, 5 übertragen. The second hydrostat 22 can be hydraulically driven by the high-pressure hydraulic medium in the high-pressure accumulator 25 in its engine function. The hydraulic drive power of the second hydrostatic unit 22 is transmitted via the transmission device 35 and the differential 6 to the driven wheels 4, 5.
Im Schubbetrieb des Hydraulikhybridantriebsstrangs 1 kann Bremsenergie von den Rädern 4, 5 über das Differenzial 6 und die Getriebeeinrichtung 35 auf den elektrischen Starter 50 sowie über den zweiten Hydrostaten 22 auf den Hochdruckspeicher 25 übertragen werden. Die zurückgewonnene Bremsenergie kann also sowohl elektrisch als auch hydraulisch gespeichert werden. Der elektrische Starter/Generator 50 kann elektrisch betrieben werden, um die verbrennungsmotorische Antriebseinrichtung 10 zu starten. Zu diesem Zweck kann ein von dem elektrischen Starter/Generator 50 bereitgestelltes Drehmoment bei geöffneten Kupplungen 40 und 60 über die hydraulische Antriebseinrichtung 20 und das Getriebe 30 auf die verbrennungsmotorische Antriebseinrichtung 10 übertragen werden. In the overrun mode of the hydraulic hybrid drive train 1, braking energy can be transmitted from the wheels 4, 5 via the differential 6 and the transmission device 35 to the electric starter 50 and via the second hydrostat 22 to the high-pressure accumulator 25. The recovered braking energy can thus be stored both electrically and hydraulically. The electric starter / generator 50 may be electrically operated to start the internal combustion engine drive device 10. For this purpose, a torque provided by the electric starter / generator 50 can be transmitted to the internal combustion engine drive device 10 with the clutches 40 and 60 open via the hydraulic drive device 20 and the transmission 30.

Claims

Ansprüche claims
1 . Hydraulikhybridantriebsstrang (1 ) mit einer verbrennungsmotorischen (10) und einer hydraulischen (20) Antriebseinrichtung, und mit einem elektrischen Starter/Generator (50) für die verbrennungsmotorische Antriebseinrichtung (10), dadurch gekennzeichnet, dass der elektrische Starter/Generator (50) für die verbrennungsmotorische Antriebseinrichtung (10) der hydraulischen Antriebseinrichtung (20) zugeordnet ist. 1 . Hydraulic hybrid powertrain (1) having an internal combustion engine (10) and a hydraulic (20) drive means, and an electric starter / generator (50) for the internal combustion engine drive means (10), characterized in that the electric starter / generator (50) for the Internal combustion engine drive device (10) is assigned to the hydraulic drive device (20).
2. Hydraulikhybridantriebsstrang nach Anspruch 1 , dadurch gekennzeichnet, dass der elektrische Starter (50) für die verbrennungsmotorische Antriebseinrichtung (10) mechanisch mit der hydraulischen Antriebseinrichtung (20) gekoppelt ist. 2. hybrid hydraulic drive train according to claim 1, characterized in that the electric starter (50) for the internal combustion engine drive means (10) is mechanically coupled to the hydraulic drive means (20).
3. Hydraulikhybridantriebsstrang nach Anspruch 2, dadurch gekennzeichnet, dass der elektrische Starter (50) für die verbrennungsmotorische Antriebseinrichtung (10) hydraulisch mit der verbrennungsmotorischen Antriebseinrichtung (10) und/oder einer angetriebenen Achse (3) mechanisch koppelbar ist. 3. hybrid hydraulic drive train according to claim 2, characterized in that the electric starter (50) for the internal combustion engine drive means (10) is hydraulically coupled to the internal combustion engine drive means (10) and / or a driven axle (3).
4. Hydraulikhybridantriebsstrang dadurch gekennzeichnet, dass der elektrische Starter/Generator (50) für die verbrennungsmotorische Antriebseinrichtung (10) zwischen die hydraulische Antriebseinrichtung (20) und eine Kupplung (60) geschaltet ist, über welche die hydraulische Antriebseinrichtung (20) mit der angetriebenen Achse (3) koppelbar ist. 4. hybrid hydraulic power train characterized in that the electric starter / generator (50) for the internal combustion engine drive means (10) between the hydraulic drive means (20) and a clutch (60) is connected, via which the hydraulic drive means (20) with the driven axle (3) can be coupled.
5. Hydraulikhybridantriebsstrang nach Anspruch 4, dadurch gekennzeichnet, dass eine Getriebeeinrichtung (35) zwischen die Kupplung (60) und die angetriebene Achse (3) geschaltet ist. 5. Hydraulikhybridantriebsstrang according to claim 4, characterized in that a transmission device (35) between the coupling (60) and the driven axle (3) is connected.
6. Hydraulikhybridantriebsstrang nach Anspruch 5, dadurch gekennzeichnet, dass die verbrennungsmotorische Antriebseinrichtung (10) über ein Getriebe (30) mit der hydraulischen Antriebseinrichtung (20) und der angetriebenen Achse (3) beziehungsweise der Getriebeeinrichtung (35) gekoppelt ist. 6. hybrid hydraulic drive train according to claim 5, characterized in that the internal combustion engine drive means (10) via a transmission (30) is coupled to the hydraulic drive device (20) and the driven axle (3) or the transmission device (35).
7. Hydraulikhybridantriebsstrang nach Anspruch 6, dadurch gekennzeichnet, dass eine weitere Kupplung (40) zwischen das Getriebe (30) und die angetriebene Achse (3) beziehungsweise die Getriebeeinrichtung (35) geschaltet ist. 7. Hydraulikhybridantriebsstrang according to claim 6, characterized in that a further coupling (40) between the transmission (30) and the driven axle (3) or the transmission device (35) is connected.
8. Hydraulikhybridantriebsstrang nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die hydraulische Antriebseinrichtung (20) zwei Hydrostaten (21 ,22) umfasst. 8. Hydraulikhybridantriebsstrang according to any one of the preceding claims, characterized in that the hydraulic drive means (20) comprises two Hydrostaten (21, 22).
9. Hydraulikhybridantriebsstrang nach Anspruch 8, dadurch gekennzeichnet, dass der elektrische Starter/Generator (50) für die verbrennungsmotorische Antriebseinrichtung (10) einem zweiten Hydrostaten (22) zugeordnet ist, der wiederum der angetriebenen Achse (3) zugeordnet ist. 9. hybrid hydraulic drive train according to claim 8, characterized in that the electric starter / generator (50) for the internal combustion engine drive means (10) is associated with a second hydrostatic unit (22), which in turn is associated with the driven axle (3).
10. Verfahren zum Betreiben eines Hydraulikhybridantriebsstrangs (1 ) nach einem der vorhergehenden Ansprüche. 10. A method for operating a hydraulic hybrid powertrain (1) according to any one of the preceding claims.
EP13786506.9A 2012-11-20 2013-11-07 Hydraulic hybrid drivetrain and method for operating a hydraulic hybrid drivetrain Withdrawn EP2922720A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012221122.5A DE102012221122A1 (en) 2012-11-20 2012-11-20 Hydraulic hybrid powertrain and method of operating a hydraulic hybrid powertrain
PCT/EP2013/073234 WO2014079693A1 (en) 2012-11-20 2013-11-07 Hydraulic hybrid drivetrain and method for operating a hydraulic hybrid drivetrain

Publications (1)

Publication Number Publication Date
EP2922720A1 true EP2922720A1 (en) 2015-09-30

Family

ID=49546422

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13786506.9A Withdrawn EP2922720A1 (en) 2012-11-20 2013-11-07 Hydraulic hybrid drivetrain and method for operating a hydraulic hybrid drivetrain

Country Status (5)

Country Link
EP (1) EP2922720A1 (en)
CN (1) CN104903134A (en)
DE (1) DE102012221122A1 (en)
IN (1) IN2015DN04233A (en)
WO (1) WO2014079693A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111065535B (en) * 2017-09-08 2021-08-03 康明斯有限公司 Hydraulic system for engine starter and generator

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2741815Y (en) * 2004-05-28 2005-11-23 山东交通学院 Parallel hydraulic mixed power driver for public automobile
CN101037087A (en) * 2006-03-14 2007-09-19 朱荣辉 mix-driving and energy-saving device of continuously variable motor vehicle
DE102006019535B4 (en) * 2006-04-27 2018-06-28 Linde Material Handling Gmbh Hydrostatic-electric traction drive
US8454469B2 (en) * 2006-09-12 2013-06-04 Purdue Research Foundation Power split transmission with energy recovery
WO2009094492A2 (en) * 2008-01-23 2009-07-30 Parker-Hannifin Corporation Electro-hydraulic machine for hybri drive system
DE102011006087A1 (en) * 2011-03-25 2012-09-27 Bayerische Motoren Werke Aktiengesellschaft Vehicle, has internal combustion engine for driving drive train, and drive/recuperation hydraulic component coupled with electric machine over clutch and coupled with drive train over another clutch, where component comprises reservoir

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2014079693A1 *

Also Published As

Publication number Publication date
DE102012221122A1 (en) 2014-05-22
WO2014079693A1 (en) 2014-05-30
CN104903134A (en) 2015-09-09
IN2015DN04233A (en) 2015-10-16

Similar Documents

Publication Publication Date Title
DE102017127695A1 (en) Hybrid powertrain with two electric machines and one internal combustion engine
DE102010036321A1 (en) Drive system for a motor vehicle and motor vehicle with such a drive system
DE102014016172A1 (en) Drive device for a hybrid-powered motor vehicle
DE102005004389A1 (en) System for reducing powertrain reaction torque
DE102010017760A1 (en) Drive system for motor car, has high voltage electric machine connected to or disconnected from crankshaft of internal combustion engine by two coupling arrangements having different transmission ratios
DE102018206050B4 (en) Method for operating a motor vehicle
EP2933128A1 (en) Vehicle having drive train
DE102011006087A1 (en) Vehicle, has internal combustion engine for driving drive train, and drive/recuperation hydraulic component coupled with electric machine over clutch and coupled with drive train over another clutch, where component comprises reservoir
EP2218603B1 (en) Hybrid drive
DE102009050956B4 (en) Drive train for an all-wheel drive hybrid vehicle with two internal combustion engines and method for operating a drive train
DE102007010343A1 (en) Hybrid vehicle with split engine
DE102019209939A1 (en) Compact hybrid transmission
DE202014000679U1 (en) Single-shaft powertrain with hybrid drive for a work machine without intermediate gear and with additional power auxiliary consumers
DE102007011791A1 (en) Drive train for vehicle, has engine and clutch that are connected in upstream direction, hydraulic aggregate and transmission that are connected in downstream direction, and another hydraulic aggregate connected downstream of transmission
DE102007003546A1 (en) Hybrid drive for motor vehicle i.e. car, has hydraulic drives energized by energy storage that includes high pressure- and low pressure-reservoir, where hydraulic drives are part of output-deriving transmission
DE102016007702A1 (en) Commercial vehicle with a parallel hybrid powertrain
DE102007019988A1 (en) Allwheel-driven passenger car, has hybrid drive including electrical machine, and decoupler arranged between crankshaft of internal-combustion engine and electrical machine that is coupled with internal combustion engine
DE102008044102A1 (en) Hybrid assembly for hybrid drive of motor vehicle, has electrical machine, where rotor of machine is connected with gear oil pump and inlet shaft of basis gear of hybrid drive directly or by gearbox
EP2922720A1 (en) Hydraulic hybrid drivetrain and method for operating a hydraulic hybrid drivetrain
DE102017009704A1 (en) Hybrid drive system
DE102010038086A1 (en) Drive system for a motor vehicle, method for operating such a drive system and motor vehicle with such a drive system
DE102014225240A1 (en) Hydraulic hybrid system
DE102010036510A1 (en) Parallel hybrid powertrain for motor car, has internal combustion engine together with electric machine over gear box drivingly connected to axis, where engine is drivingly connected with planet carrier of planetary gears
DE102010013345A1 (en) Motor vehicle driving device
DE102014225238A1 (en) Hydraulic hybrid system

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20150622

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20180602

RIC1 Information provided on ipc code assigned before grant

Ipc: B60K 6/365 20071001ALI20140613BHEP

Ipc: B60K 6/40 20071001ALI20140613BHEP

Ipc: B60W 10/103 20120101ALI20140613BHEP

Ipc: F16H 47/02 20060101ALI20140613BHEP

Ipc: F16H 37/08 20060101ALI20140613BHEP

Ipc: B60K 6/36 20071001AFI20140613BHEP

Ipc: B60K 6/12 20060101ALI20140613BHEP