WO2015104131A1 - Method for operating a hydraulic hybrid vehicle - Google Patents

Method for operating a hydraulic hybrid vehicle Download PDF

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Publication number
WO2015104131A1
WO2015104131A1 PCT/EP2014/077412 EP2014077412W WO2015104131A1 WO 2015104131 A1 WO2015104131 A1 WO 2015104131A1 EP 2014077412 W EP2014077412 W EP 2014077412W WO 2015104131 A1 WO2015104131 A1 WO 2015104131A1
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WO
WIPO (PCT)
Prior art keywords
hydraulic
combustion engine
internal combustion
hybrid vehicle
reference variable
Prior art date
Application number
PCT/EP2014/077412
Other languages
German (de)
French (fr)
Inventor
Timo Steinbach
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
Priority to CN201480072791.7A priority Critical patent/CN106103229A/en
Publication of WO2015104131A1 publication Critical patent/WO2015104131A1/en

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Classifications

    • 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
    • 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
    • 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
    • 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
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • 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
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
    • B60W20/12—Controlling the power contribution of each of the prime movers to meet required power demand using control strategies taking into account route information
    • 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
    • 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
    • B60W30/18136—Engine braking
    • 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
    • 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
    • B60W2520/00—Input parameters relating to overall vehicle dynamics
    • B60W2520/10—Longitudinal speed
    • 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
    • B60W2540/00—Input parameters relating to occupants
    • B60W2540/12—Brake pedal position
    • 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
    • B60W2552/00—Input parameters relating to infrastructure
    • B60W2552/15—Road slope, i.e. the inclination of a road segment in the longitudinal direction
    • 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 method for operating a
  • Hydraulic hybrid vehicle comprising as primary drive an internal combustion engine and as a secondary drive at least two hydrostats, of which at least one converts in a recuperation operation braking energy into hydraulic energy, which is stored in a hydraulic pressure accumulator.
  • Hybrid drive for a motor vehicle in which a hydraulically operated energy converter and a combustible gas-powered energy converter interact.
  • the object of the invention is the performance of a
  • Hydraulic hybrid vehicle comprising as primary drive an internal combustion engine and as a secondary drive at least two hydrostats, of which at least one converts in a recuperation operation braking energy into hydraulic energy, which is stored in a hydraulic pressure accumulator, in particular during long downhills, to improve.
  • the object is in a method for operating a
  • Hydraulic hybrid vehicle comprising as primary drive an internal combustion engine and as a secondary drive at least two hydrostats, of which at least one in a recuperation operation braking energy in hydraulic Energy is converted, which is stored in a hydraulic pressure accumulator, solved in that when driving uphill to slow down the
  • Hydraulic hybrid vehicle used towing power of the internal combustion engine in response to an inclination of the hydraulic hybrid vehicle is specified. Hydraulic accumulators in hydraulic hybrid vehicles usually have only a relatively small energy storage capacity. This low
  • Hydraulic hybrid vehicle specified This provides the advantage that when a longer downhill of the hydraulic hybrid vehicle, the towing power of the engine can be used in a similar manner as in a vehicle with a manual transmission.
  • Engine provided power is transmitted hydraulically to at least one driven wheel.
  • This requires at least two hydrostats, one of which works as a pump and one as a motor.
  • the towing power of the internal combustion engine can be adjusted continuously.
  • the method according to the invention is used, for example, in hydraulic power split drive trains or in serial hydrostatic drive trains.
  • a target engine speed is determined in dependence on the inclination of the hydraulic hybrid vehicle.
  • Combustion engine target speed makes it possible in a simple manner to present optimal brake assistance by the internal combustion engine. As a result, a service brake of the hydraulic hybrid vehicle can be significantly relieved.
  • a further preferred exemplary embodiment of the method is characterized in that a current vehicle speed is taken into account when determining a reference variable for the internal combustion engine.
  • a current vehicle speed is taken into account when determining a reference variable for the internal combustion engine.
  • a further preferred exemplary embodiment of the method is characterized in that a current brake pedal pressure is taken into account when determining a reference variable or the reference variable for the internal combustion engine. This provides the advantage that a driver's request can be taken into account in a simple manner.
  • a further preferred exemplary embodiment of the method is characterized in that a current brake pedal travel is taken into account in the determination of a or the reference variable for the internal combustion engine. As a result, the consideration of a driver's request can be further improved.
  • a further preferred embodiment of the method is characterized in that the internal combustion engine after an interruption of the Rekuperations worriess, in particular because an energy storage capacity of a
  • Hydraulic accumulator is exhausted, is used in a towed operation to relieve a service brake of the hydraulic hybrid vehicle. This can significantly extend the service life of the service brake.
  • the invention further relates to a computer program product with a
  • a computer program comprising software means for performing a method as previously described when the computer program is run on a computer.
  • the computer is, for example, a control unit that is integrated in a motor vehicle.
  • the control unit will too referred to as electrical control unit or electronic control unit.
  • the invention further relates to a control device with such a computer program product.
  • the control unit is preferably in a
  • the motor vehicle installed.
  • the motor vehicle is in particular a hydraulic hybrid vehicle with a previously described
  • the invention further relates to a hybrid hydraulic vehicle having an internal combustion engine as a primary drive and at least two hydrostatic drives as a secondary drive, and to a previously described control device.
  • a hydrostatic drive 1 is shown simplified in the form of a hydraulic circuit diagram.
  • the hydrostatic travel drive 1 can be used, for example, in a hydraulic hybrid powertrain, which comprises a hydraulic drive in addition to an internal combustion engine drive.
  • the internal combustion engine drive is designed, for example, as an internal combustion engine 4 and is also referred to as an internal combustion engine.
  • the hydraulic drive comprises, for example, a hydrostatic drive 5, which is drivingly connected to the internal combustion engine 4.
  • the hydraulic drive comprises at least two hydrostats, as will be explained below.
  • Hydrostat 5 includes a hydraulic pump, which is also referred to as a hydraulic pump shortened.
  • the hydrostat 5 is connected on the input side to a low-pressure region 6.
  • the hydrostat 5 is connected to a high-pressure region 7.
  • the low-pressure region 6 and the high-pressure region 7 are part of a
  • Fluidsystems 8 which in operation with a hydraulic medium as well
  • Hydraulic system is called.
  • the hydraulic medium is, for example, hydraulic oil, which is also abbreviated as oil.
  • Hydraulic system 8 includes unspecified hydraulic lines and a valve block. 9
  • the hydrostatic travel drive 1 further comprises a total of four driven wheels 11 to 14.
  • Each of the driven wheels 11 to 14 is associated with a hydrostatic 21 to 24, which is connected to the respective hub of the driven wheel 11 to 14. Between the hydrostats 21 to 24 and the driven wheel 11 to 14 may be connected in each case a transmission.
  • the hydrostats 21 to 24 can advantageously be operated both as a hydraulic pump and as a hydraulic motor.
  • the hydrostats 21 to 24 are also referred to as hydraulic machines and can be designed, for example, as hydraulic axial piston machines.
  • the low-pressure region 6 comprises a low-pressure accumulator 30 with a gas volume or a gas side 31 and an oil side
  • the oil side 32 of the low-pressure accumulator 30 is connected to the inlet of the hydrostatic 5 in connection.
  • Low-pressure accumulator 30 represents a hydraulic medium reservoir, from which the hydraulic system 8 is supplied with hydraulic medium.
  • the high-pressure area 7 comprises a high-pressure accumulator 40 with a
  • the oil side 42 of the high-pressure accumulator 40 is connected to the outlet of the hydrostatic 5 in connection.
  • the oil side 42 of the high pressure accumulator 40 is further in the high pressure region 7 with the Hydrostaten 21 to 24 in conjunction.
  • the oil side 32 of the low pressure accumulator 30 is in the low pressure region 6 with the Hydrostaten 21 to 24 in conjunction.
  • a towing capacity of the internal combustion engine 4 is dependent on the inclination of the Hydraulic hybrid vehicle specified.
  • Towing power of the engine 4 as in a conventional vehicle with a manual transmission, can be used to the
  • Hydraulic hybrid vehicle will more or less towing capacity of the
  • Hydraulic hybrid vehicle is detected with a suitable inclination sensor.
  • the tilt sensor is in control with a controller in the
  • An associated engine target speed is determined according to an aspect of the invention as a function of the current vehicle inclination.
  • the further input quantity is, for example, an actual vehicle speed, a current one
  • the current vehicle speed is recorded and stored in the control unit.
  • the current storage state of charge is detected, for example, with a suitable pressure sensor or a suitable displacement sensor and also stored in the control unit.
  • the current brake pedal pressure or brake pedal travel is also detected with suitable sensors and stored in the control unit.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Hybrid Electric Vehicles (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Arrangement Or Mounting Of Propulsion Units For Vehicles (AREA)

Abstract

The invention relates to a method for operating a hydraulic hybrid vehicle which comprises an internal combustion engine (4) as the primary drive and at least two hydrostatic units (21-24) as the secondary drives, at least one of said hydrostatic units converting braking energy to hydraulic energy in a regenerative mode, which hydraulic energy is stored in a hydraulic pressure accumulator (40). In order to improve the operating behavior of the hydraulic hybrid vehicle, a drag power of the internal combustion engine (4) used during downhill travel to brake the hydraulic hybrid vehicle is specified depending on a tilt of the hydraulic hybrid vehicle.

Description

Beschreibung Titel  Description title
Verfahren zum Betreiben eines Hydraulikhybridfahrzeugs  Method for operating a hydraulic hybrid vehicle
Die Erfindung betrifft ein Verfahren zum Betreiben eines The invention relates to a method for operating a
Hydraulikhybridfahrzeugs, das als primären Antrieb einen Verbrennungsmotor und als sekundären Antrieb mindestens zwei Hydrostaten umfasst, von denen mindestens einer in einem Rekuperationsbetrieb Bremsenergie in hydraulische Energie umwandelt, die in einem hydraulischen Druckspeicher gespeichert wird. Hydraulic hybrid vehicle comprising as primary drive an internal combustion engine and as a secondary drive at least two hydrostats, of which at least one converts in a recuperation operation braking energy into hydraulic energy, which is stored in a hydraulic pressure accumulator.
Stand der Technik State of the art
Aus der deutschen Offenlegungsschrift DE 10 201 1 002 967 A1 ist ein From the German patent application DE 10 201 1 002 967 A1 is a
Hybridantrieb für ein Kraftfahrzeug bekannt, bei dem ein hydraulisch betriebener Energiewandler und ein mit brennbarem Gas betriebener Energiewandler zusammenwirken. Hybrid drive for a motor vehicle, in which a hydraulically operated energy converter and a combustible gas-powered energy converter interact.
Offenbarung der Erfindung Disclosure of the invention
Aufgabe der Erfindung ist es, das Betriebsverhalten eines The object of the invention is the performance of a
Hydraulikhybridfahrzeugs, das als primären Antrieb einen Verbrennungsmotor und als sekundären Antrieb mindestens zwei Hydrostaten umfasst, von denen mindestens einer in einem Rekuperationsbetrieb Bremsenergie in hydraulische Energie umwandelt, die in einem hydraulischen Druckspeicher gespeichert wird, insbesondere bei längeren Bergabfahrten, zu verbessern. Hydraulic hybrid vehicle comprising as primary drive an internal combustion engine and as a secondary drive at least two hydrostats, of which at least one converts in a recuperation operation braking energy into hydraulic energy, which is stored in a hydraulic pressure accumulator, in particular during long downhills, to improve.
Die Aufgabe ist bei einem Verfahren zum Betreiben eines The object is in a method for operating a
Hydraulikhybridfahrzeugs, das als primären Antrieb einen Verbrennungsmotor und als sekundären Antrieb mindestens zwei Hydrostaten umfasst, von denen mindestens einer in einem Rekuperationsbetrieb Bremsenergie in hydraulische Energie umwandelt, die in einem hydraulischen Druckspeicher gespeichert wird, dadurch gelöst, dass bei einer Bergfahrt eine zum Abbremsen des Hydraulic hybrid vehicle comprising as primary drive an internal combustion engine and as a secondary drive at least two hydrostats, of which at least one in a recuperation operation braking energy in hydraulic Energy is converted, which is stored in a hydraulic pressure accumulator, solved in that when driving uphill to slow down the
Hydraulikhybridfahrzeugs verwendete Schleppleistung des Verbrennungsmotors in Abhängigkeit von einer Neigung des Hydraulikhybridfahrzeugs vorgegeben wird. Hydraulische Druckspeicher in Hydraulikhybridfahrzeugen haben in der Regel nur eine relativ geringe Energiespeicherkapazität. Diese geringe Hydraulic hybrid vehicle used towing power of the internal combustion engine in response to an inclination of the hydraulic hybrid vehicle is specified. Hydraulic accumulators in hydraulic hybrid vehicles usually have only a relatively small energy storage capacity. This low
Energiespeicherkapazität ist im Rekuperationsbetrieb innerhalb von kurzen Bremsvorgängen ausgeschöpft. Bei längeren Bremsvorgängen, wie sie zum Beispiel bei längeren Bergabfahrten des Hydraulikhybridfahrzeugs auftreten, kann deshalb nicht dauerhaft Energie rekuperiert werden. Gemäß einem wesentlichen Aspekt der Erfindung wird daher die Schleppleistung des Energy storage capacity is exhausted in recuperation operation within short braking cycles. For longer braking processes, as they occur, for example, in longer downhill of the hydraulic hybrid vehicle, therefore, can not be permanently recuperated energy. According to one essential aspect of the invention, therefore, the towing performance of
Verbrennungsmotors in Abhängigkeit des Neigungswinkels des Internal combustion engine as a function of the inclination angle of
Hydraulikhybridfahrzeugs vorgegeben. Das liefert den Vorteil, dass bei einer längeren Bergabfahrt des Hydraulikhybridfahrzeugs die Schleppleistung des Verbrennungsmotors in ähnlicher Art und Weise wie bei einem Fahrzeug mit einem Handschaltgetriebe genutzt werden kann. Die von dem Hydraulic hybrid vehicle specified. This provides the advantage that when a longer downhill of the hydraulic hybrid vehicle, the towing power of the engine can be used in a similar manner as in a vehicle with a manual transmission. The one of the
Verbrennungsmotor bereitgestellte Leistung wird hydraulisch auf mindestens ein angetriebenes Rad übertragen. Dazu sind mindestens zwei Hydrostaten erforderlich, von denen einer als Pumpe und einer als Motor arbeitet. Durch das erfindungsgemäße Verfahren kann die Schleppleistung des Verbrennungsmotors stufenlos verstellt werden. Das erfindungsgemäße Verfahren wird zum Beispiel in Antriebssträngen mit hydraulischer Leistungsverzweigung oder in seriellen hydrostatischen Antriebssträngen angewendet. Engine provided power is transmitted hydraulically to at least one driven wheel. This requires at least two hydrostats, one of which works as a pump and one as a motor. By the method according to the invention, the towing power of the internal combustion engine can be adjusted continuously. The method according to the invention is used, for example, in hydraulic power split drive trains or in serial hydrostatic drive trains.
Ein bevorzugtes Ausführungsbeispiel des Verfahrens ist dadurch A preferred embodiment of the method is characterized
gekennzeichnet, dass eine Verbrennungsmotorsolldrehzahl in Abhängigkeit von der Neigung des Hydraulikhybridfahrzeugs ermittelt wird. Die ermittelte characterized in that a target engine speed is determined in dependence on the inclination of the hydraulic hybrid vehicle. The determined
Verbrennungsmotorsolldrehzahl ermöglicht auf einfache Art und Weise die Darstellung einer optimalen Bremsunterstützung durch den Verbrennungsmotor. Dadurch kann eine Betriebsbremse des Hydraulikhybridfahrzeugs deutlich entlastet werden. Combustion engine target speed makes it possible in a simple manner to present optimal brake assistance by the internal combustion engine. As a result, a service brake of the hydraulic hybrid vehicle can be significantly relieved.
Ein weiteres bevorzugtes Ausführungsbeispiel des Verfahrens ist dadurch gekennzeichnet, dass eine aktuelle Fahrzeuggeschwindigkeit bei der Ermittlung einer Führungsgröße für den Verbrennungsmotor berücksichtigt wird. Dadurch kann die Bremsunterstützungsfunktion des Verbrennungsmotors weiter verbessert werden. A further preferred exemplary embodiment of the method is characterized in that a current vehicle speed is taken into account when determining a reference variable for the internal combustion engine. Thereby For example, the brake assist function of the engine can be further improved.
Ein weiteres bevorzugtes Ausführungsbeispiel des Verfahrens ist dadurch gekennzeichnet, dass ein Ladezustand einer Hydrospeichereinrichtung bei derA further preferred embodiment of the method is characterized in that a state of charge of a hydraulic accumulator device in the
Ermittlung einer beziehungsweise der Führungsgröße für den Determining one or the reference variable for the
Verbrennungsmotor berücksichtigt wird. Dadurch kann auf einfache Art und Weise sichergestellt werden, dass die Hydrospeichereinrichtung bei einer längeren Bergabfahrt immer optimal aufgeladen ist. Internal combustion engine is taken into account. This can be ensured in a simple manner that the hydraulic accumulator device is always optimally charged at a longer downhill.
Ein weiteres bevorzugtes Ausführungsbeispiel des Verfahrens ist dadurch gekennzeichnet, dass ein aktueller Bremspedaldruck bei der Ermittlung einer beziehungsweise der Führungsgröße für den Verbrennungsmotor berücksichtigt wird. Das liefert den Vorteil, dass ein Fahrerwunsch auf einfache Art und Weise berücksichtigt werden kann. A further preferred exemplary embodiment of the method is characterized in that a current brake pedal pressure is taken into account when determining a reference variable or the reference variable for the internal combustion engine. This provides the advantage that a driver's request can be taken into account in a simple manner.
Ein weiteres bevorzugtes Ausführungsbeispiel des Verfahrens ist dadurch gekennzeichnet, dass ein aktueller Bremspedalweg bei der Ermittlung einer beziehungsweise der Führungsgröße für den Verbrennungsmotor berücksichtigt wird. Dadurch kann die Berücksichtigung eines Fahrerwunschs weiter verbessert werden. A further preferred exemplary embodiment of the method is characterized in that a current brake pedal travel is taken into account in the determination of a or the reference variable for the internal combustion engine. As a result, the consideration of a driver's request can be further improved.
Ein weiteres bevorzugtes Ausführungsbeispiel des Verfahrens ist dadurch gekennzeichnet, dass der Verbrennungsmotor nach einer Unterbrechung des Rekuperationsbetriebs, insbesondere weil eine Energiespeicherkapazität einesA further preferred embodiment of the method is characterized in that the internal combustion engine after an interruption of the Rekuperationsbetriebs, in particular because an energy storage capacity of a
Hydrospeichers ausgeschöpft ist, in einem Schleppbetrieb zur Entlastung einer Betriebsbremse des Hydraulikhybridfahrzeugs verwendet wird. Dadurch kann die Lebensdauer Betriebsbremse erheblich verlängert werden. Die Erfindung betrifft des Weiteren ein Computerprogrammprodukt mit einemHydraulic accumulator is exhausted, is used in a towed operation to relieve a service brake of the hydraulic hybrid vehicle. This can significantly extend the service life of the service brake. The invention further relates to a computer program product with a
Computerprogramm, das Softwaremittel zum Durchführen eines vorab beschriebenen Verfahrens aufweist, wenn das Computerprogramm auf einem Computer ausgeführt wird. Bei dem Computer handelt es sich zum Beispiel um ein Steuergerät, das in ein Kraftfahrzeug integriert ist. Das Steuergerät wird auch als elektrische Kontrolleinheit beziehungsweise elektronische Kontrolleinheit bezeichnet. A computer program comprising software means for performing a method as previously described when the computer program is run on a computer. The computer is, for example, a control unit that is integrated in a motor vehicle. The control unit will too referred to as electrical control unit or electronic control unit.
Die Erfindung betrifft darüber hinaus ein Steuergerät mit einem derartigen Computerprogrammprodukt. Das Steuergerät ist vorzugsweise in ein The invention further relates to a control device with such a computer program product. The control unit is preferably in a
Kraftfahrzeug eingebaut. Bei dem Kraftfahrzeug handelt es sich insbesondere um ein Hydraulikhybridfahrzeug mit einem vorab beschriebenen Motor vehicle installed. The motor vehicle is in particular a hydraulic hybrid vehicle with a previously described
Hydraulikhybridantrieb. Hydraulic hybrid drive.
Die Erfindung betrifft des Weiteren ein Hydraulikhybridfahrzeug mit einem Verbrennungsmotor als primären Antrieb und mindestens zwei Hydrostaten als sekundären Antrieb, und mit einem vorab beschriebenen Steuergerät. The invention further relates to a hybrid hydraulic vehicle having an internal combustion engine as a primary drive and at least two hydrostatic drives as a secondary drive, and to a previously described control device.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung, in der unter Bezugnahme auf die Zeichnung verschiedene Ausführungsbeispiele im Einzelnen beschrieben sind. Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, various embodiments are described in detail.
In der einzigen beiliegenden Figur ist ein Hydraulikhybridfahrzeug mit einem hydrostatischen Fahrantrieb vereinfacht dargestellt. In the single accompanying figure, a hydraulic hybrid vehicle with a hydrostatic drive is shown simplified.
In der Figur ist ein hydrostatischer Fahrantrieb 1 vereinfacht in Form eines Hydraulikschaltplans dargestellt. Der hydrostatische Fahrantrieb 1 kann zum Beispiel in einem Hydraulikhybridantriebsstrang verwendet werden, der neben einem verbrennungsmotorischen Antrieb einen hydraulischen Antrieb umfasst. In the figure, a hydrostatic drive 1 is shown simplified in the form of a hydraulic circuit diagram. The hydrostatic travel drive 1 can be used, for example, in a hydraulic hybrid powertrain, which comprises a hydraulic drive in addition to an internal combustion engine drive.
Der verbrennungsmotorische Antrieb ist zum Beispiel als Brennkraftmaschine 4 ausgeführt und wird auch als Verbrennungsmotor bezeichnet. Der hydraulische Antrieb umfasst zum Beispiel einen Hydrostaten 5, der antriebsmäßig mit der Brennkraftmaschine 4 verbunden ist. Insgesamt umfasst der hydraulische Antrieb mindestens zwei Hydrostaten, wie im Folgenden erläutert wird. The internal combustion engine drive is designed, for example, as an internal combustion engine 4 and is also referred to as an internal combustion engine. The hydraulic drive comprises, for example, a hydrostatic drive 5, which is drivingly connected to the internal combustion engine 4. Overall, the hydraulic drive comprises at least two hydrostats, as will be explained below.
Der durch die Brennkraftmaschine 4 angetriebene Hydrostat 5 umfasst eine Hydraulikpumpe, die verkürzt auch als Hydropumpe bezeichnet wird. Der Hydrostat 5 ist eingangsseitig an einen Niederdruckbereich 6 angeschlossen. Ausgangsseitig ist der Hydrostat 5 an einen Hochdruckbereich 7 angeschlossen. Der Niederdruckbereich 6 und der Hochdruckbereich 7 sind Teil eines The driven by the internal combustion engine 4 Hydrostat 5 includes a hydraulic pump, which is also referred to as a hydraulic pump shortened. The hydrostat 5 is connected on the input side to a low-pressure region 6. On the output side, the hydrostat 5 is connected to a high-pressure region 7. The low-pressure region 6 and the high-pressure region 7 are part of a
Fluidsystems 8, das im Betrieb mit einem Hydraulikmedium auch als Fluidsystems 8, which in operation with a hydraulic medium as well
Hydrauliksystem bezeichnet wird. Bei dem Hydraulikmedium handelt es sich zum Beispiel um Hydrauliköl, das verkürzt auch als Öl bezeichnet wird. Das Hydraulic system is called. The hydraulic medium is, for example, hydraulic oil, which is also abbreviated as oil. The
Hydrauliksystem 8 umfasst nicht näher bezeichnete Hydraulikleitungen und einen Ventilblock 9. Hydraulic system 8 includes unspecified hydraulic lines and a valve block. 9
Der hydrostatische Fahrantrieb 1 umfasst des Weiteren insgesamt vier angetriebene Räder 11 bis 14. Jedem der angetriebenen Räder 11 bis 14 ist ein Hydrostat 21 bis 24 zugeordnet, der an die jeweilige Radnabe des angetriebenen Rades 11 bis 14 angebunden ist. Zwischen die Hydrostaten 21 bis 24 und das angetriebene Rad 11 bis 14 kann jeweils ein Getriebe geschaltet sein. The hydrostatic travel drive 1 further comprises a total of four driven wheels 11 to 14. Each of the driven wheels 11 to 14 is associated with a hydrostatic 21 to 24, which is connected to the respective hub of the driven wheel 11 to 14. Between the hydrostats 21 to 24 and the driven wheel 11 to 14 may be connected in each case a transmission.
Die Hydrostaten 21 bis 24 können vorteilhaft sowohl als Hydraulikpumpe als auch als Hydraulikmotor betrieben werden. Die Hydrostaten 21 bis 24 werden auch als Hydraulikmaschinen bezeichnet und können zum Beispiel als hydraulische Axialkolbenmaschinen ausgeführt sein. The hydrostats 21 to 24 can advantageously be operated both as a hydraulic pump and as a hydraulic motor. The hydrostats 21 to 24 are also referred to as hydraulic machines and can be designed, for example, as hydraulic axial piston machines.
Der Niederdruckbereich 6 umfasst einen Niederdruckspeicher 30 mit einem Gasvolumen beziehungsweise einer Gasseite 31 und einer Ölseite The low-pressure region 6 comprises a low-pressure accumulator 30 with a gas volume or a gas side 31 and an oil side
beziehungsweise einem Ölvolumen 32. Die Ölseite 32 des Niederdruckspeichers 30 steht mit dem Eingang des Hydrostaten 5 in Verbindung. Der or an oil volume 32. The oil side 32 of the low-pressure accumulator 30 is connected to the inlet of the hydrostatic 5 in connection. Of the
Niederdruckspeicher 30 stellt ein Hydraulikmediumreservoir dar, aus welchem das Hydrauliksystem 8 mit Hydraulikmedium versorgt wird. Low-pressure accumulator 30 represents a hydraulic medium reservoir, from which the hydraulic system 8 is supplied with hydraulic medium.
Der Hochdruckbereich 7 umfasst einen Hochdruckspeicher 40 mit einem The high-pressure area 7 comprises a high-pressure accumulator 40 with a
Gasvolumen beziehungsweise einer Gasseite 41 und einer Ölseite Gas volume or a gas side 41 and an oil side
beziehungsweise einem Ölvolumen 42. Die Ölseite 42 des Hochdruckspeichers 40 steht mit dem Ausgang des Hydrostaten 5 in Verbindung. Die Ölseite 42 des Hochdruckspeichers 40 steht des Weiteren im Hochdruckbereich 7 mit den Hydrostaten 21 bis 24 in Verbindung. Die Ölseite 32 des Niederdruckspeichers 30 steht im Niederdruckbereich 6 mit den Hydrostaten 21 bis 24 in Verbindung. or an oil volume 42. The oil side 42 of the high-pressure accumulator 40 is connected to the outlet of the hydrostatic 5 in connection. The oil side 42 of the high pressure accumulator 40 is further in the high pressure region 7 with the Hydrostaten 21 to 24 in conjunction. The oil side 32 of the low pressure accumulator 30 is in the low pressure region 6 with the Hydrostaten 21 to 24 in conjunction.
Gemäß einem wesentlichen Aspekt der Erfindung wird eine Schleppleistung des Verbrennungsmotors 4 in Abhängigkeit der Neigung des Hydraulikhybridfahrzeugs vorgegeben. Das liefert den Vorteil, dass die According to one essential aspect of the invention, a towing capacity of the internal combustion engine 4 is dependent on the inclination of the Hydraulic hybrid vehicle specified. This provides the advantage that the
Schleppleistung des Verbrennungsmotors 4, wie bei einem herkömmlichen Fahrzeug mit einem Handschaltgetriebe, genutzt werden kann, um das Towing power of the engine 4, as in a conventional vehicle with a manual transmission, can be used to the
Hydraulikhybridfahrzeug abzubremsen. Braking hydraulic hybrid vehicle.
In Abhängigkeit von einem aktuellen Neigungswinkel des Depending on a current angle of inclination of the
Hydraulikhybridfahrzeugs wird mehr oder weniger Schleppleistung des Hydraulic hybrid vehicle will more or less towing capacity of the
Verbrennungsmotors 4 bereitgestellt. Der aktuelle Neigungswinkel des Internal combustion engine 4 is provided. The current angle of inclination of the
Hydraulikhybridfahrzeugs wird mit einem geeigneten Neigungssensor erfasst. Der Neigungssensor ist steuerungsmäßig mit einem Steuergerät in dem Hydraulic hybrid vehicle is detected with a suitable inclination sensor. The tilt sensor is in control with a controller in the
Hydraulikhybridfahrzeug verbunden.  Hydraulic hybrid vehicle connected.
Mit Hilfe des Steuergeräts wird der Verbrennungsmotor 4 bei längeren With the help of the controller, the engine 4 at longer
Bergabfahrten im Schleppbetrieb verwendet, um eine fahrzeuginterne Downhill towed used to an in-vehicle
Betriebsbremse zu entlasten. Eine zugehörige Verbrennungsmotorsolldrehzahl wird gemäß einem Aspekt der Erfindung in Abhängigkeit von der aktuellen Fahrzeugneigung ermittelt. Dadurch kann auf einfache Art und Weise eine teilweise Nachbildung des Schubverhaltens eines herkömmlichen Fahrzeugs mit einem konventionellen Antrieb erreicht werden. Relieve service brake. An associated engine target speed is determined according to an aspect of the invention as a function of the current vehicle inclination. As a result, a partial simulation of the thrust behavior of a conventional vehicle with a conventional drive can be achieved in a simple manner.
Gemäß weiteren Aspekten der Erfindung wird die Ermittlung einer According to further aspects of the invention, the determination of a
Führungsgröße des Verbrennungsmotors 4 um mindestens eine weitere Reference variable of the internal combustion engine 4 by at least one more
Eingangsgröße ergänzt. Bei der weiteren Eingangsgröße handelt es sich zum Beispiel um eine aktuelle Fahrzeuggeschwindigkeit, einen aktuellen Input size supplemented. The further input quantity is, for example, an actual vehicle speed, a current one
Speicherladezustand, einen aktuellen Bremspedaldruck und/oder einen aktuellen Bremspedalweg. Battery charge state, a current brake pedal pressure and / or a current brake pedal travel.
Die aktuelle Fahrzeuggeschwindigkeit wird erfasst und im Steuergerät abgespeichert. Der aktuelle Speicherladezustand wird zum Beispiel mit einem geeigneten Drucksensor oder einem geeigneten Wegsensor erfasst und ebenfalls im Steuergerät abgespeichert. Der aktuelle Bremspedaldruck beziehungsweise Bremspedalweg wird ebenfalls mit geeigneten Sensoren erfasst und im Steuergerät gespeichert. The current vehicle speed is recorded and stored in the control unit. The current storage state of charge is detected, for example, with a suitable pressure sensor or a suitable displacement sensor and also stored in the control unit. The current brake pedal pressure or brake pedal travel is also detected with suitable sensors and stored in the control unit.

Claims

Ansprüche claims
1. Verfahren zum Betreiben eines Hydraulikhybridfahrzeugs, das als primären Antrieb einen Verbrennungsmotor (4) und als sekundären Antrieb mindestens zwei Hydrostaten (21-24) umfasst, von denen mindestens einer in einem Rekuperationsbetrieb Bremsenergie in hydraulische Energie umwandelt, die in einem hydraulischen Druckspeicher (40) gespeichert wird, dadurch gekennzeichnet, dass bei einer Bergabfahrt eine zum Abbremsen des Hydraulikhybridfahrzeugs verwendete Schleppleistung des 1. A method for operating a hydraulic hybrid vehicle comprising as primary drive an internal combustion engine (4) and as secondary drive at least two hydrostats (21-24), of which at least one converts in a recuperation operation braking energy into hydraulic energy stored in a hydraulic pressure accumulator ( 40) is stored, characterized in that when driving downhill a towing the hydraulic hybrid vehicle towing power used
Verbrennungsmotors (4) in Abhängigkeit von einer Neigung des  Internal combustion engine (4) in response to a slope of the
Hydraulikhybridfahrzeugs vorgegeben wird.  Hydraulic hybrid vehicle is specified.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass eine  2. The method according to claim 1, characterized in that a
Verbrennungsmotorsolldrehzahl in Abhängigkeit von der Neigung des Hydraulikhybridfahrzeugs ermittelt wird.  Set engine speed is determined in dependence on the inclination of the hydraulic hybrid vehicle.
3. Verfahren nach einem der vorhergehenden Ansprüche, dadurch  3. The method according to any one of the preceding claims, characterized
gekennzeichnet, dass eine aktuelle Fahrzeuggeschwindigkeit bei der Ermittlung einer Führungsgröße für den Verbrennungsmotor berücksichtigt wird.  characterized in that an actual vehicle speed is taken into account in the determination of a reference variable for the internal combustion engine.
4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch  4. The method according to any one of the preceding claims, characterized
gekennzeichnet, dass ein Ladezustand einer Hydrospeichereinrichtung (40) bei der Ermittlung einer beziehungsweise der Führungsgröße für den Verbrennungsmotor (4) berücksichtigt wird.  in that a charge state of a hydraulic accumulator device (40) is taken into account in the determination of a or the reference variable for the internal combustion engine (4).
5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch  5. The method according to any one of the preceding claims, characterized
gekennzeichnet, dass ein aktueller Bremspedaldruck bei der Ermittlung einer beziehungsweise der Führungsgröße für den Verbrennungsmotor (4) berücksichtigt wird.  in that a current brake pedal pressure is taken into account when determining a reference variable or the reference variable for the internal combustion engine (4).
6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch  6. The method according to any one of the preceding claims, characterized
gekennzeichnet, dass ein aktueller Bremspedalweg bei der Ermittlung einer beziehungsweise der Führungsgröße für den Verbrennungsmotor (4) berücksichtigt wird. in that a current brake pedal travel is taken into account when determining a reference variable or the reference variable for the internal combustion engine (4).
7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch 7. The method according to any one of the preceding claims, characterized
gekennzeichnet, dass der Verbrennungsmotor (4) nach einer Unterbrechung des Rekuperationsbetriebs, insbesondere weil eine Energiespeicherkapazität eines Hydrospeichers (40) ausgeschöpft ist, in einem Schleppbetrieb zur Entlastung einer Betriebsbremse des Hydraulikhybridfahrzeugs verwendet wird.  in that after an interruption of the recuperation operation, in particular because an energy storage capacity of a hydraulic accumulator (40) has been exhausted, the internal combustion engine (4) is used in a towing operation to relieve a service brake of the hybrid hydraulic vehicle.
8. Computerprogrammprodukt mit einem Computerprogramm, das  8. Computer program product with a computer program that
Softwaremittel zum Durchführen eines Verfahrens nach einem der vorhergehenden Ansprüche aufweist, wenn das Computerprogramm auf einem Computer ausgeführt wird.  Software means for performing a method according to any one of the preceding claims, when the computer program is executed on a computer.
9. Steuergerät mit einem Computerprogrammprodukt nach Anspruch 8.  9. Control device with a computer program product according to claim 8.
10. Hydraulikhybridfahrzeug mit einem Verbrennungsmotor (4) als primären Antrieb und mindestens zwei Hydrostaten (21-24) als sekundären Antrieb, und mit einem Steuergerät nach Anspruch 9.  10. hybrid hydraulic vehicle with an internal combustion engine (4) as a primary drive and at least two hydrostats (21-24) as a secondary drive, and with a control device according to claim 9.
PCT/EP2014/077412 2014-01-08 2014-12-11 Method for operating a hydraulic hybrid vehicle WO2015104131A1 (en)

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