WO2013000554A1 - Method for optimizing a vehicle drive and vehicle having a correspondingly optimized vehicle drive - Google Patents

Method for optimizing a vehicle drive and vehicle having a correspondingly optimized vehicle drive Download PDF

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Publication number
WO2013000554A1
WO2013000554A1 PCT/EP2012/002662 EP2012002662W WO2013000554A1 WO 2013000554 A1 WO2013000554 A1 WO 2013000554A1 EP 2012002662 W EP2012002662 W EP 2012002662W WO 2013000554 A1 WO2013000554 A1 WO 2013000554A1
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WO
WIPO (PCT)
Prior art keywords
vehicle
driving
drive
wheel
hydraulic pump
Prior art date
Application number
PCT/EP2012/002662
Other languages
German (de)
French (fr)
Inventor
Peter Schubert
Rupprecht ANZ
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 WO2013000554A1 publication Critical patent/WO2013000554A1/en

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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
    • B60K23/00—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for
    • B60K23/08—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for for changing number of driven wheels, for switching from driving one axle to driving two or more axles
    • B60K23/0808—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for for changing number of driven wheels, for switching from driving one axle to driving two or more axles for varying torque distribution between driven axles, e.g. by transfer clutch
    • 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
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/34—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles
    • B60K17/356—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having fluid or electric motor, for driving one or more wheels
    • 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
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K7/0015—Disposition of motor in, or adjacent to, traction wheel the motor being hydraulic
    • 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
    • B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B60W50/0098—Details of control systems ensuring comfort, safety or stability not otherwise provided for
    • 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
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/44—Control of exclusively fluid gearing hydrostatic with more than one pump or motor in operation
    • F16H61/456—Control of the balance of torque or speed between pumps or motors
    • 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
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/10—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of fluid gearing
    • 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
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K2007/0092—Disposition of motor in, or adjacent to, traction wheel the motor axle being coaxial to the wheel axle
    • 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
    • B60K23/00—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for
    • B60K23/08—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for for changing number of driven wheels, for switching from driving one axle to driving two or more axles
    • B60K2023/085—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for for changing number of driven wheels, for switching from driving one axle to driving two or more axles automatically actuated
    • B60K2023/0858—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for for changing number of driven wheels, for switching from driving one axle to driving two or more axles automatically actuated with electric means, e.g. electro-hydraulic 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
    • B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B60W2050/0062—Adapting control system settings
    • B60W2050/0075—Automatic parameter input, automatic initialising or calibrating means
    • B60W2050/0083—Setting, resetting, calibration
    • B60W2050/0085—Setting or resetting initial positions
    • 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
    • B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B60W2050/0062—Adapting control system settings
    • B60W2050/0075—Automatic parameter input, automatic initialising or calibrating means
    • B60W2050/0083—Setting, resetting, calibration
    • B60W2050/0088—Adaptive recalibration
    • 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
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H2061/0068—Method or means for testing of transmission controls or parts thereof
    • 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
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H2061/0075—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by a particular control method
    • F16H2061/0087—Adaptive control, e.g. the control parameters adapted by learning
    • 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
    • F16H2342/00—Calibrating
    • 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
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems
    • 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
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/84—Data processing systems or methods, management, administration

Definitions

  • the invention relates to a method for optimizing a vehicle drive with conventional and hydrostatic drive according to the preamble of
  • Such hydrostatic drives are used for example in mobile work machines or commercial vehicles as an auxiliary drive for the front wheels, while the rear axle is driven by a conventional mechanical drive train.
  • hydrostatic auxiliary drives whose hydraulic pumps are adjustable.
  • hydraulic components installed in such hydrostatic auxiliary drives have manufacturing tolerances which require individual adaptation to the respective vehicle and in particular to the parallel conventional drive.
  • corresponding correction data are determined by free rotation of the wheels of the jacked vehicle and stored in a control unit of the vehicle.
  • a disadvantage of this method is the high cost of jacking the vehicle and for driving through the various speeds.
  • Object of the present invention is to reduce the cost of determining the correction data of a hydrostatic auxiliary drive.
  • the object is achieved by a method for optimizing a vehicle drive with conventional and hydrostatic drive according to claim 1 and by a corresponding vehicle according to claim 10.
  • the inventive method is used to optimize a vehicle drive, in particular the drive of a truck, with an internal combustion engine for driving a first wheel or a first axis of the vehicle and with a hydrostatic auxiliary drive for driving a second wheel or a second axis of the vehicle.
  • the hydrostatic auxiliary drive has an adjustable hydraulic pump driven by the internal combustion engine and at least one hydraulic motor.
  • the driving of the vehicle or the drive of the axles takes place according to a predetermined driving maneuver at a steering angle of approximately 0 degrees.
  • Dangers are preferred on a substantially level ground, especially on a road.
  • the application of the method according to the invention takes place before the vehicle is put into operation.
  • the effort is minimized when the method according to the invention is carried out as part of a test drive.
  • the application of the method according to the invention takes place several times during operation or during the lifetime of the vehicle.
  • aging and resulting tolerances can be compensated via the correction data. This is advantageous in terms of low fuel consumption and consistent ride. Wear of the hydraulic motor or the hydraulic pump or a change in the circumference of the wheels, in particular by pressure fluctuations or wear of their tires, can be equalized. The data may be used to diagnose "wear limit reached.” Exceeding limits may be due to pressure loss in a tire and thus be used to detect such pressure loss.
  • Hydraulic pump connected to working lines.
  • a Bescheunigen up to a maximum capacity of the hydraulic pump.
  • control unit is switched to a learning mode.
  • the vehicle according to the invention has a vehicle drive which has an internal combustion engine for driving a first wheel or a first axle of the vehicle and a hydrostatic auxiliary drive for driving a second wheel or a second axle of the vehicle.
  • the hydrostatic auxiliary drive has a hydraulic pump driven by the internal combustion engine and at least one hydraulic motor.
  • correction data are stored when driving the vehicle on the ground or Ground or driving the axles of the vehicle were determined on a four-wheel tester.
  • the correction data can be justified by manufacturing tolerances or by wear of the vehicle drive or by changes in the circumference of the wheels, in particular by pressure fluctuations of their tires.
  • Figure 1 is a schematic diagram of a truck with an inventive
  • FIG. 2 shows a circuit diagram of the hydrostatic auxiliary drive according to FIG. 1.
  • FIG. 1 shows a highly schematic representation of a truck 1, the rear wheels 2 are driven via a conventional mechanical drive train with internal combustion engine 4, transmission 6, propeller shaft 8 and differential.
  • the truck 1 is designed with an inventively optimized hydrostatic auxiliary drive 10, which can optionally be switched on, for example, in heavy terrain.
  • This hydrostatic auxiliary drive 10 has for each of the front wheels 12, a hydraulic motor 14, which is driven by a combustion engine 4
  • Pump unit 6 is supplied with pressure medium.
  • this is designed as a radial piston motor, wherein a plurality of pistons 18 are supported on a cam ring 20.
  • the pistons 18 are guided radially displaceable in cylinder bores of a cylinder drum 22 and each define a working space 24, said plurality of
  • a motor housing 30 carrying the lifting ring 20 is subjected to a pressure, for example a feed pressure, while the working chambers 24 are subjected to the tank pressure or some other lower pressure and thus lifted off the cam ring 20 - the friction losses are accordingly significantly reduced.
  • FIG. 2 shows the circuit diagram of the inventively optimized hydrostatic
  • Valve assembly 32 is in hydraulic communication with the hydraulic motors 14.
  • the pump unit 16 has a hydraulic pump 34 which can be pivoted over zero and which is driven by the internal combustion engine 4 via a drive shaft 36.
  • a pressure line at the top is a low pressure line 38
  • another pressure line connected to a port of the variable displacement hydraulic pump 34 is the high pressure line 40.
  • a feed pump On the drive shaft 36 is still seated a feed pump, sucked via the pressure medium from a tank T and can be fed with a feed pressure, for example 20 to 30 bar in the low-pressure branch of the auxiliary drive 10.
  • the adjustment of the pivoting angle of the adjustable hydraulic pump 34 by means of an actuating cylinder 42, the actuating piston connected to a pump control valve 44 is, which is designed as controlled via an electronic control unit with control electronics proportional valve.
  • the pump unit 16 is connected via control oil connections X1, X2 to a control oil supply.
  • Such pressure and flow control systems for adjustable hydraulic pumps 34 are known from the prior art, so that can be dispensed with a detailed explanation.
  • the setpoint is specified as an electrical variable and adjusted in response to the control of the pump control valve 44, a control piston of the actuating cylinder 42, wherein the return of the actual position of the actuating piston as in the present case can be done mechanically or electrically.
  • the position of the actuating piston is then compared via the control electronics with the predetermined desired value, which corresponds to a specific flow rate, and the adjusting piston adjusted until the setpoint and actual value match and thus the required delivery volume flow is set.
  • the pressure medium is conveyed into the high-pressure line 40 and flows back from the load, in the present case from the hydraulic motors 14 in a closed circuit via the low-pressure line 38 to the low-pressure connection of the adjustable hydraulic pump 34.
  • pump control reference is made, for example, to DE 10 2004 061 861 B4.
  • the truck 1 is driven straight ahead after its production in a test drive on a flat surface.
  • the rear wheels 2 are conventionally driven and the front wheels 12 via the hydrostatic auxiliary drive 10.
  • the control unit is switched to a learning mode.
  • correction data for the hydraulic pump 34 are determined and stored automatically in the control unit. This correction data results from "tension" between the conventional drive and the hydrostatic auxiliary drive 10, which can be measured as pressure fluctuations on the working lines 38, 40.
  • the electronic control unit can also be the control unit for the entire drive of the vehicle.
  • a method for optimizing a vehicle drive - in particular a truck - wherein the vehicle drive comprises an internal combustion engine for driving a first wheel or a first axis of the vehicle and a hydrostatic auxiliary drive for driving a second wheel or a second axis of the vehicle.
  • the hydrostatic auxiliary drive has an adjustable hydraulic pump driven by the internal combustion engine and at least one hydraulic motor.
  • a corresponding vehicle having a vehicle drive which has an internal combustion engine for driving a first wheel or a first axle of the vehicle and a hydrostatic auxiliary drive for driving a second wheel or a second axle of the vehicle.
  • the hydrostatic auxiliary drive has a hydraulic pump driven by the internal combustion engine and at least one hydraulic motor.

Abstract

The invention relates to a method for optimizing a vehicle drive, in particular of a heavy goods vehicle (1), wherein the vehicle drive has an internal combustion engine (4) for driving a first wheel (2) or a first axle of the vehicle (1) and a hydrostatic additional drive (10) for driving a second wheel (12) or a second axle of the vehicle (1). The hydrostatic additional drive (10) has an adjustable hydraulic pump (16) driven by the internal combustion engine (4) and at least one hydraulic motor (14). The method according to the invention comprises the following steps: driving the vehicle on a substrate or floor or driving the axles of the vehicle on an all-wheel test bed and determining correction data; and automatically storing the correction data in an electronic control device of the hydrostatic additional drive (10). The invention also relates to a corresponding vehicle (1) having a vehicle drive which has an internal combustion engine (4) for driving a first wheel (2) or a first axle of the vehicle (1) and a hydrostatic additional drive (10) for driving a second wheel (12) or a second axle of the vehicle (1). The hydrostatic additional drive (10) has an adjustable hydraulic pump (16) driven by the internal combustion engine (4) and at least one hydraulic motor (14). Correction data determined during driving of the vehicle (1) on a substrate or floor or during driving of the axles of the vehicle (1) on an all-wheel test bed are stored in an electronic control device of the hydrostatic additional drive.

Description

VERFAHREN UM OPTIMIEREN EINES FAHRZEUGANTRIEBS UND FAHRZEUG MIT EINEM ENTSPRECHEND OPTIMIERTEN FAHRZEUGANTRIEB METHOD FOR OPTIMIZING A VEHICLE DRIVE AND VEHICLE WITH A SUITABLY OPTIMIZED VEHICLE DRIVE
Beschreibung description
Die Erfindung betrifft ein Verfahren zur Optimierung eines Fahrzeugantriebs mit konventionellem und mit hydrostatischem Antrieb gemäß dem Oberbegriff des The invention relates to a method for optimizing a vehicle drive with conventional and hydrostatic drive according to the preamble of
Patentanspruches 1 und ein entsprechendes Fahrzeug gemäß Patentanspruch 10. Claim 1 and a corresponding vehicle according to claim 10.
Derartige hydrostatische Antriebe werden beispielsweise bei mobilen Arbeitsmaschinen oder Nutzfahrzeugen als Zusatzantrieb für die Vorderräder verwendet, während die Hinterachse über einen konventionellen mechanischen Antriebsstrang angetrieben wird. Such hydrostatic drives are used for example in mobile work machines or commercial vehicles as an auxiliary drive for the front wheels, while the rear axle is driven by a conventional mechanical drive train.
Ein derartiges Nutzfahrzeug mit konventionellem und hydrostatischem Antriebsstrang ist beispielsweise in der DE 42 12 983 C1 erläutert. Bei dieser Lösung kann der hydrostatische Antriebsstrang bei Bedarf über eine Ventilanordnung zugeschaltet werden, wobei jedem Rad der Vorderachse ein Hydromotor zugeordnet ist, die über eine über Null verschwenkbare Hydropumpe mit Druckmittel versorgt wird, um die Vorderräder anzutreiben. Das bekannte System ist darüber hinaus mit einem Retarder ausgeführt, über den die Bremsanlage des Nutzfahrzeugs beim Bremsen hydraulisch unterstützt wird. Such a commercial vehicle with conventional and hydrostatic drive train is explained for example in DE 42 12 983 C1. In this solution, the hydrostatic drive train can be switched on if necessary via a valve arrangement, wherein each wheel of the front axle is associated with a hydraulic motor which is supplied via a zero-pivotable hydraulic pump with pressure medium to drive the front wheels. The known system is also designed with a retarder over which the brake system of the commercial vehicle is hydraulically assisted during braking.
In den Druckschriften DE 41 10 161 A1 und US2002/0027025 sind weitere In the publications DE 41 10 161 A1 and US2002 / 0027025 are more
hydrostatische Zusatzantriebe offenbart, deren Hydropumpen verstellbar sind. discloses hydrostatic auxiliary drives whose hydraulic pumps are adjustable.
Die in derartigen hydrostatischen Zusatzantrieben verbauten Hydraulikkomponenten weisen Fertigungstoleranzen auf, die eine individuelle Anpassung an das jeweilige Fahrzeug und insbesondere an den parallelen konventionellen Antrieb erfordern. The hydraulic components installed in such hydrostatic auxiliary drives have manufacturing tolerances which require individual adaptation to the respective vehicle and in particular to the parallel conventional drive.
Gemäß dem Stand der Technik werden entsprechende Korrekturdaten durch freies Drehen der Räder des aufgebockten Fahrzeugs ermittelt und in einem Steuergerät des Fahrzeugs hinterlegt. According to the prior art, corresponding correction data are determined by free rotation of the wheels of the jacked vehicle and stored in a control unit of the vehicle.
Nachteilig an diesem Verfahren ist der hohe Aufwand für das Aufbocken des Fahrzeugs und für das Durchfahren der verschiedenen Geschwindigkeiten. Aufgabe der vorliegenden Erfindung ist es, den Aufwand für die Ermittlung der Korrekturdaten eines hydrostatischen Zusatzantriebs zu verringern. A disadvantage of this method is the high cost of jacking the vehicle and for driving through the various speeds. Object of the present invention is to reduce the cost of determining the correction data of a hydrostatic auxiliary drive.
Die Aufgabe wird gelöst durch ein Verfahren zur Optimierung eines Fahrzeugantriebs mit konventionellem und mit hydrostatischem Antrieb gemäß Patentanspruch 1 und durch ein entsprechendes Fahrzeug gemäß Patentanspruch 10. The object is achieved by a method for optimizing a vehicle drive with conventional and hydrostatic drive according to claim 1 and by a corresponding vehicle according to claim 10.
Das erfindungsgemäße Verfahren dient zum Optimieren eines Fahrzeugantriebs, insbesondere des Antriebs eines Lastkraftwagens, mit einem Verbrennungsmotor zum Antrieb eines ersten Rades oder einer ersten Achse des Fahrzeugs und mit einem hydrostatischen Zusatzantrieb zum Antrieb eines zweiten Rades oder einer zweiten Achse des Fahrzeugs. Der hydrostatische Zusatzantrieb hat eine vom Verbrennungsmotor angetriebene verstellbare Hydropumpe und zumindest einen Hydromotor. Das erfindungsgemäße Verfahren hat die Schritte: The inventive method is used to optimize a vehicle drive, in particular the drive of a truck, with an internal combustion engine for driving a first wheel or a first axis of the vehicle and with a hydrostatic auxiliary drive for driving a second wheel or a second axis of the vehicle. The hydrostatic auxiliary drive has an adjustable hydraulic pump driven by the internal combustion engine and at least one hydraulic motor. The method according to the invention has the steps:
- Fahren des Fahrzeugs auf Untergrund oder Boden oder Antreiben der Achsen des Fahrzeugs auf einem Allradprüfstand und Ermitteln von Korrekturdaten; und  Driving the vehicle on ground or ground or driving the axles of the vehicle on a four-wheel drive test bench and determining correction data; and
- automatisches Abspeichern der Korrekturdaten in einem elektronischen Steuergerät des hydrostatischen Zusatzantriebs.  - Automatic storage of the correction data in an electronic control unit of the hydrostatic auxiliary drive.
Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den abhängigen Patentansprüchen beschrieben. Further advantageous embodiments of the invention are described in the dependent claims.
Vorzugsweise erfolgt das Fahren des Fahrzeugs oder der Antrieb der Achsen gemäß einem vorbestimmten Fahrmanöver bei einem Lenkwinkel von etwa 0 Grad. Gefahren wird bevorzugt auf einem im Wesentlichen ebenen Untergrund, insbesondere auf einer Straße. Preferably, the driving of the vehicle or the drive of the axles takes place according to a predetermined driving maneuver at a steering angle of approximately 0 degrees. Dangers are preferred on a substantially level ground, especially on a road.
Bei einem bevorzugten Anwendungsfall erfolgt die Anwendung des erfindungsgemäßen Verfahrens vor Inbetriebnahme des Fahrzeugs. In a preferred application, the application of the method according to the invention takes place before the vehicle is put into operation.
Der Aufwand ist dabei minimiert, wenn das erfindungsgemäße Verfahren im Rahmen einer Probefahrt durchgeführt wird. Bevorzugt erfolgt die Anwendung des erfindungsgemäßen Verfahrens mehrmals während des Betriebs oder während der Lebensdauer des Fahrzeugs. The effort is minimized when the method according to the invention is carried out as part of a test drive. Preferably, the application of the method according to the invention takes place several times during operation or during the lifetime of the vehicle.
Bei einer Probefahrt vor erstmaligem Nutzbetrieb des Fahrzeugs oder nach einem Austausch von Komponenten können über die Korrekturdaten Fertigungstoleranzen des Hydromotors oder der Hydropumpe egalisiert werden. In a test drive before the first use of the vehicle or after an exchange of components can be equalized by the correction data manufacturing tolerances of the hydraulic motor or the hydraulic pump.
Beim zweitgenannten Anwendungsfall können über die Korrekturdaten Alterung und daraus resultierende Toleranzen ausgeglichen werden. Das ist vorteilhaft im Hinblick auf einen geringen Treibstoffverbrauch und gleichbleibendes Fahrverhalten. Verschleiß des Hydromotors oder der Hydropumpe oder eine Änderung des Umfangs der Räder, insbesondere durch Druckschwankungen oder Verschleiß ihrer Reifen, können egalisiert werden. Die Daten können zur Diagnose„Verschleißgrenze erreicht" genutzt werden. Ein Überschreiten von Grenzwerten kann durch Druckverlust in einem Reifen bedingt sein und damit zum Erkennen eines solchen Druckverlusts genutzt werden. In the second-mentioned application, aging and resulting tolerances can be compensated via the correction data. This is advantageous in terms of low fuel consumption and consistent ride. Wear of the hydraulic motor or the hydraulic pump or a change in the circumference of the wheels, in particular by pressure fluctuations or wear of their tires, can be equalized. The data may be used to diagnose "wear limit reached." Exceeding limits may be due to pressure loss in a tire and thus be used to detect such pressure loss.
Vorzugsweise wird folgender zusätzlicher Schritt durchgeführt: Preferably, the following additional step is performed:
- Modulation der Leistung der Hydropumpe durch Ermittlung von Drücken in an die - Modulation of the power of the hydraulic pump by determining pressures in the
Hydropumpe angeschlossen Arbeitsleitungen. Hydraulic pump connected to working lines.
Vorzugsweise erfolgt während des Fahrens des Fahrzeugs ein Bescheunigen bis zu einer maximalen Förderleistung der Hydropumpe. Preferably, during driving of the vehicle, a Bescheunigen up to a maximum capacity of the hydraulic pump.
Vorzugsweise ist während der Anwendung des erfindungsgemäßen Verfahrens das Steuergerät in einen Lernmodus geschaltet. Preferably, during the application of the method according to the invention, the control unit is switched to a learning mode.
Das erfindungsgemäße Fahrzeug hat einen Fahrzeugantrieb, der einen Verbrennungsmotor zum Antrieb eines ersten Rades oder einer ersten Achse des Fahrzeugs und einen hydrostatischen Zusatzantrieb zum Antrieb eines zweiten Rades oder einer zweiten Achse des Fahrzeugs aufweist. Der hydrostatische Zusatzantrieb hat eine vom Verbrennungsmotor angetrieben verstellbaren Hydropumpe und zumindest einen Hydromotor. In einem elektronischen Steuergerät des hydrostatischen Zusatzantriebs sind Korrekturdaten abgespeichert, die beim Fahren des Fahrzeugs auf Untergrund oder Boden oder Antreiben der Achsen des Fahrzeugs auf einem Allradprüfstand ermittelt wurden. The vehicle according to the invention has a vehicle drive which has an internal combustion engine for driving a first wheel or a first axle of the vehicle and a hydrostatic auxiliary drive for driving a second wheel or a second axle of the vehicle. The hydrostatic auxiliary drive has a hydraulic pump driven by the internal combustion engine and at least one hydraulic motor. In an electronic control unit of the hydrostatic auxiliary drive correction data are stored when driving the vehicle on the ground or Ground or driving the axles of the vehicle were determined on a four-wheel tester.
Dabei können die Korrekturdaten durch Fertigungstoleranzen oder durch Verschleiß des Fahrzeugantriebs oder durch Änderungen des Umfangs der Räder, insbesondere durch Druckschwankungen ihrer Reifen, begründet sein. In this case, the correction data can be justified by manufacturing tolerances or by wear of the vehicle drive or by changes in the circumference of the wheels, in particular by pressure fluctuations of their tires.
Im Folgenden wird anhand der Figuren ein Ausführungsbeispiel der Erfindung detailliert beschrieben. Es zeigen: In the following, an embodiment of the invention will be described in detail with reference to FIGS. Show it:
Figur 1 eine Prinzipskizze eines Lastkraftwagens mit einem erfindungsgemäß Figure 1 is a schematic diagram of a truck with an inventive
optimierten hydrostatischen Zusatzantrieb; und optimized hydrostatic auxiliary drive; and
Figur 2 ein Schaltbild des hydrostatischen Zusatzantriebs gemäß Figur 1. FIG. 2 shows a circuit diagram of the hydrostatic auxiliary drive according to FIG. 1.
Figur 1 zeigt eine stark schematisierte Darstellung eines Lastkraftwagens 1 , dessen Hinterräder 2 über einen konventionellen mechanischen Antriebsstrang mit Verbrennungsmotor 4, Getriebe 6, Kardanwelle 8 sowie Differenzial angetrieben werden. Der Lastkraftwagen 1 ist mit einem erfindungsgemäß optimierten hydrostatischen Zusatzantrieb 10 ausgeführt, der wahlweise beispielsweise im schweren Gelände zugeschaltet werden kann. Dieser hydrostatische Zusatzantrieb 10 hat für jedes der Vorderräder 12 einen Hydromotor 14, der über eine vom Verbrennungsmotor 4 angetriebene Figure 1 shows a highly schematic representation of a truck 1, the rear wheels 2 are driven via a conventional mechanical drive train with internal combustion engine 4, transmission 6, propeller shaft 8 and differential. The truck 1 is designed with an inventively optimized hydrostatic auxiliary drive 10, which can optionally be switched on, for example, in heavy terrain. This hydrostatic auxiliary drive 10 has for each of the front wheels 12, a hydraulic motor 14, which is driven by a combustion engine 4
Pumpenaggregat 6 mit Druckmittel versorgt wird. Pump unit 6 is supplied with pressure medium.
Gemäß dem vergrößerten Teilausschnitt des Hydromotors 14 in Figur 1 ist dieser als Radialkolbenmotor ausgeführt, wobei eine Vielzahl von Kolben 18 an einem Hubring 20 abgestützt sind. According to the enlarged partial section of the hydraulic motor 14 in Figure 1, this is designed as a radial piston motor, wherein a plurality of pistons 18 are supported on a cam ring 20.
Die Kolben 18 sind radial verstellbar in Zylinderbohrungen einer Zylindertrommel 22 geführt und begrenzen jeweils einen Arbeitsraum 24, wobei diese Vielzahl von The pistons 18 are guided radially displaceable in cylinder bores of a cylinder drum 22 and each define a working space 24, said plurality of
Arbeitsräumen 24 aufeinander folgend mit Hochdruck und Niederdruck verbunden werden, Auf Grund des daraus resultierenden Kolbenhubs dreht die Zylindertrommel 22, wobei die Kolben 18 über Rollen 26 am Hubring 20 abrollen. Die Zylindertrommel 22 ist drehfest mit einer Antriebswelle 28 verbunden, die praktisch die Radachse des jeweiligen Vorderrades 12 bildet. Der Hydromotor 14 bildet eine Art„Radlager" des jeweiligen Vorderrades 12. Working chambers 24 consecutively connected to high pressure and low pressure, Due to the resulting piston stroke rotates the cylinder drum 22, the piston 18 roll over rollers 26 on the cam ring 20. The cylinder drum 22 is rotatably connected to a drive shaft 28, which is practically the wheel axle of the respective front wheel 12 forms. The hydraulic motor 14 forms a kind of "wheel bearing" of the respective front wheel 12.
In der dargestellten Position liegen die Kolben 18 am Hubring 20 an, so dass bei nicht angesteuertem bzw. eingeschaltetem hydrostatischem Zusatzantrieb 10 und„leer" mitlaufenden Hydromotoren 14 erhebliche Reibungsverluste auftreten. Zur Minimierung dieser Reibungsverluste können die Hydromotoren 14 in einem Free-Wheel-Modus betrieben werden. Dazu wird ein den Hubring 20 tragendes Motorgehäuse 30 mit einem Druck, beispielsweise einem Speisedruck, beaufschlagt, während die Arbeitsräume 24 mit dem Tankdruck oder einem sonstigen niedrigeren Druck beaufschlagt sind. Durch die Druckdifferenz werden die Kolben 18 in Richtung zur Antriebswelle 28 eingefahren und somit vom Hubring 20 abgehoben - die Reibungsverluste sind dementsprechend erheblich reduziert. In the illustrated position, the pistons 18 are in contact with the lifting ring 20, so that considerable friction losses occur when the hydrostatic auxiliary drive 10 and the "empty" revolving hydraulic motors 14 are not actuated, and to minimize these friction losses, the hydraulic motors 14 can operate in a free-wheel mode For this purpose, a motor housing 30 carrying the lifting ring 20 is subjected to a pressure, for example a feed pressure, while the working chambers 24 are subjected to the tank pressure or some other lower pressure and thus lifted off the cam ring 20 - the friction losses are accordingly significantly reduced.
Figur 2 zeigt den Schaltplan des erfindungsgemäß optimierten hydrostatischen Figure 2 shows the circuit diagram of the inventively optimized hydrostatic
Zusatzantriebes 10 aus Figur 1. Man erkennt die beiden Vorderräder 12, die jeweils über einen Hydromotor 14 angetrieben werden. Die Druckmittelversorgung erfolgt über das Pumpenaggregat 16, das über zwei Arbeitsanschlüsse A, B und über eine Additional drive 10 from Figure 1. It can be seen the two front wheels 12, which are each driven by a hydraulic motor 14. The pressure medium supply via the pump unit 16, the two working ports A, B and via a
Ventilanordnung 32 in hydraulischer Verbindung mit den Hydromotoren 14 steht. Valve assembly 32 is in hydraulic communication with the hydraulic motors 14.
Das Pumpenaggregat 16 hat eine über Null verschwenkbare Hydropumpe 34, die vom Verbrennungsmotor 4 über eine Antriebswelle 36 angetrieben wird. Bei den folgenden Erläuterungen sei angenommen, dass eine (in Figur 2) oben liegende Druckleitung eine Niederdruckleitung 38 ist, während eine andere mit einem Anschluss der verstellbaren Hydropumpe 34 verbundene Druckleitung die Hochdruckleitung 40 ist. Je nach The pump unit 16 has a hydraulic pump 34 which can be pivoted over zero and which is driven by the internal combustion engine 4 via a drive shaft 36. In the following explanations, assume that a pressure line at the top (in FIG. 2) is a low pressure line 38, while another pressure line connected to a port of the variable displacement hydraulic pump 34 is the high pressure line 40. Depending on
Ansteuerung der verstellbaren Hydropumpe 34 kann der Hochdruck- und Control of the adjustable hydraulic pump 34, the high-pressure and
Niederdruckzweig wechseln. Change low pressure branch.
Auf der Antriebswelle 36 sitzt weiterhin eine Speisepumpe, über die Druckmittel aus einem Tank T angesaugt und mit einem Speisedruck, von beispielsweise 20 bis 30 bar in den Niederdruckzweig des Zusatzantriebes 10 eingespeist werden kann. On the drive shaft 36 is still seated a feed pump, sucked via the pressure medium from a tank T and can be fed with a feed pressure, for example 20 to 30 bar in the low-pressure branch of the auxiliary drive 10.
Die Verstellung des Schwenkwinkels der verstellbaren Hydropumpe 34 erfolgt mittels eines Stellzylinders 42, dessen Stellkolben mit einem Pumpenregelventil 44 verbunden ist, das als über ein elektronisches Steuergerät mit Regelelektronik angesteuertes Proportionalventil ausgeführt ist. Das Pumpenaggregat 16 ist über Steuerölanschlüsse X1 , X2 an eine Steuerölversorgung angeschlossen. Derartige Druck- und Förderstrom- regelsysteme für verstellbare Hydropumpen 34 sind aus dem Stand der Technik bekannt, so dass auf eine ausführliche Erläuterung verzichtet werden kann. Bei einem derartigen Pumpenregelventil 44 wird der Sollwert als elektrische Größe vorgegeben und in Abhängigkeit von der Ansteuerung des Pumpenregelventils 44 ein Stellkolben des Stellzylinders 42 verstellt, wobei die Rückführung der Ist-Position des Stellkolbens wie im vorliegenden Fall mechanisch oder aber auch elektrisch erfolgen kann. Die Lage des Stellkolbens wird dann über die Regelelektronik mit dem vorgegebenen Soll-Wert, der einem bestimmten Fördervolumenstrom entspricht, verglichen und der Stellkolben so lange verstellt, bis Soll- und Ist-Wert übereinstimmen und somit der geforderte Fördervolumenstrom eingestellt ist. The adjustment of the pivoting angle of the adjustable hydraulic pump 34 by means of an actuating cylinder 42, the actuating piston connected to a pump control valve 44 is, which is designed as controlled via an electronic control unit with control electronics proportional valve. The pump unit 16 is connected via control oil connections X1, X2 to a control oil supply. Such pressure and flow control systems for adjustable hydraulic pumps 34 are known from the prior art, so that can be dispensed with a detailed explanation. In such a pump control valve 44, the setpoint is specified as an electrical variable and adjusted in response to the control of the pump control valve 44, a control piston of the actuating cylinder 42, wherein the return of the actual position of the actuating piston as in the present case can be done mechanically or electrically. The position of the actuating piston is then compared via the control electronics with the predetermined desired value, which corresponds to a specific flow rate, and the adjusting piston adjusted until the setpoint and actual value match and thus the required delivery volume flow is set.
Gemäß den vorstehenden Ausführungen wird das Druckmittel in die Hochdruckleitung 40 gefördert und strömt vom Verbraucher, im vorliegenden Fall von den Hydromotoren 14 in einem geschlossenen Kreislauf über die Niederdruckleitung 38 zum Niederdruck- anschluss der verstellbaren Hydropumpe 34 zurück. Hinsichtlich weiterer Einzelheiten der Pumpensteuerung sei beispielsweise auf die DE 10 2004 061 861 B4 verwiesen. According to the above embodiments, the pressure medium is conveyed into the high-pressure line 40 and flows back from the load, in the present case from the hydraulic motors 14 in a closed circuit via the low-pressure line 38 to the low-pressure connection of the adjustable hydraulic pump 34. With regard to further details of the pump control, reference is made, for example, to DE 10 2004 061 861 B4.
Erfindungsgemäß wird der Lastkraftwagen 1 nach seiner Produktion im Rahmen einer Probefahrt auf einem ebenen Untergrund geradeaus gefahren. Dabei werden die Hinterräder 2 konventionell und die Vorderräder 12 über den hydrostatischen Zusatzantrieb 10 angetrieben. Zum Ausgleich von Fertigungstoleranzen wird das nicht näher dargestellte Steuergerät in einen Lernmodus geschaltet. Dann werden Korrekturdaten für die Hydropumpe 34 ermittelt und im Steuergerät automatisch abgespeichert. Diese Korrekturdaten ergeben sich durch„Verspannungen" zwischen dem konventionellen Antrieb und dem hydrostatischen Zusatzantrieb 10, die als Druckschwankungen an den Arbeitsleitungen 38, 40 gemessen werden können. According to the truck 1 is driven straight ahead after its production in a test drive on a flat surface. Here, the rear wheels 2 are conventionally driven and the front wheels 12 via the hydrostatic auxiliary drive 10. To compensate for manufacturing tolerances, the control unit, not shown, is switched to a learning mode. Then correction data for the hydraulic pump 34 are determined and stored automatically in the control unit. This correction data results from "tension" between the conventional drive and the hydrostatic auxiliary drive 10, which can be measured as pressure fluctuations on the working lines 38, 40.
Das elektronische Steuergerät kann auch das Steuergerät für den gesamten Antrieb das Fahrzeugs sein. Offenbart ist ein Verfahren zum Optimieren eines Fahrzeugantriebs -insbesondere eines LKWs - wobei der Fahrzeugantrieb einen Verbrennungsmotor zum Antrieb eines ersten Rades oder einer ersten Achse des Fahrzeugs und einen hydrostatischen Zusatzantrieb zum Antrieb eines zweiten Rades oder einer zweiten Achse des Fahrzeugs aufweist. Der hydrostatische Zusatzantrieb hat eine vom Verbrennungsmotor angetriebene verstellbare Hydropumpe und zumindest einen Hydromotor. Das erfindungsgemäße Verfahren hat die Schritte: The electronic control unit can also be the control unit for the entire drive of the vehicle. Disclosed is a method for optimizing a vehicle drive - in particular a truck - wherein the vehicle drive comprises an internal combustion engine for driving a first wheel or a first axis of the vehicle and a hydrostatic auxiliary drive for driving a second wheel or a second axis of the vehicle. The hydrostatic auxiliary drive has an adjustable hydraulic pump driven by the internal combustion engine and at least one hydraulic motor. The method according to the invention has the steps:
- Fahren des Fahrzeugs auf Untergrund oder Boden oder Antreiben der Achsen des Fahrzeugs auf einem Allradprüfstand und Ermitteln von Korrekturdaten; und  Driving the vehicle on ground or ground or driving the axles of the vehicle on a four-wheel drive test bench and determining correction data; and
- automatisches Abspeichern der Korrekturdaten in einem elektronischen Steuergerät des Zusatzantriebs.  - Automatic storage of the correction data in an electronic control unit of the auxiliary drive.
Offenbart ist weiterhin ein entsprechendes Fahrzeug mit einem Fahrzeugantrieb, der einen Verbrennungsmotor zum Antrieb eines ersten Rades oder einer ersten Achse des Fahrzeugs und einen hydrostatischen Zusatzantrieb zum Antrieb eines zweiten Rades oder einer zweiten Achse des Fahrzeugs aufweist. Der hydrostatische Zusatzantrieb hat eine vom Verbrennungsmotor angetrieben verstellbaren Hydropumpe und zumindest einen Hydromotor. In einem elektronischen Steuergerät des Zusatzantriebs sind Also disclosed is a corresponding vehicle having a vehicle drive which has an internal combustion engine for driving a first wheel or a first axle of the vehicle and a hydrostatic auxiliary drive for driving a second wheel or a second axle of the vehicle. The hydrostatic auxiliary drive has a hydraulic pump driven by the internal combustion engine and at least one hydraulic motor. In an electronic control unit of the auxiliary drive are
Korrekturdaten abgespeichert, die beim Fahren des Fahrzeugs auf Untergrund oder Boden oder beim Antreiben der Achsen des Fahrzeugs auf einem Allradprüfstand ermittelt wurden. Correction data stored when driving the vehicle on ground or ground or when driving the axles of the vehicle on a four-wheel drive test bench.

Claims

Patentansprüche claims
1. Verfahren zum Optimieren eines Fahrzeugantriebs mit einem Verbrennungsmotor (4) zum Antrieb eines ersten Rades (2) oder einer ersten Achse und mit einem hydrostatischen Zusatzantrieb (10) zum Antrieb eines zweiten Rades (12) oder einer zweiten Achse, wobei der hydrostatische Zusatzantrieb (10) eine vom Verbrennungsmotor (4) angetriebene verstellbare Hydropumpe (34) und einen Hydromotor (14) hat, gekennzeichnet durch die Schritte: 1. A method for optimizing a vehicle drive with an internal combustion engine (4) for driving a first wheel (2) or a first axis and with a hydrostatic auxiliary drive (10) for driving a second wheel (12) or a second axis, wherein the hydrostatic auxiliary drive (10) has an adjustable hydraulic pump (34) driven by the internal combustion engine (4) and a hydraulic motor (14), characterized by the steps:
- Fahren des Fahrzeugs (1) auf Untergrund oder Antreiben der Achsen des Fahrzeugs auf einem Allradprüfstand und Ermitteln von Korrekturdaten; und  - Driving the vehicle (1) on the ground or driving the axles of the vehicle on a four-wheel tester and determining correction data; and
- automatisches Abspeichern der Korrekturdaten in einem elektronischen Steuergerät des hydrostatischen Zusatzantriebs (10).  - Automatic storage of the correction data in an electronic control unit of the hydrostatic auxiliary drive (10).
2. Verfahren nach Anspruch 1 , wobei das Fahren des Fahrzeugs (1) oder das Antreiben der Achsen gemäß einem vorbestimmten Fahrmanöver bei einem Lenkwinkel von etwa 0 Grad erfolgt. 2. The method of claim 1, wherein the driving of the vehicle (1) or the driving of the axles takes place according to a predetermined driving maneuver at a steering angle of about 0 degrees.
3. Verfahren nach Anspruch 1 oder 2, das vor Inbetriebnahme des Fahrzeugs (1) erfolgt. 3. The method according to claim 1 or 2, which takes place before the commissioning of the vehicle (1).
4. Verfahren nach Anspruch 1 oder 2, das mehrmals während des Betriebs oder während der Lebensdauer des Fahrzeugs (1) erfolgt. 4. The method of claim 1 or 2, which takes place several times during operation or during the life of the vehicle (1).
5. Verfahren nach Anspruch 3, wobei über die Korrekturdaten Fertigungstoleranzen des Hydromotors (14) oder der Hydropumpe (34) egalisiert werden. 5. The method of claim 3, wherein on the correction data manufacturing tolerances of the hydraulic motor (14) or the hydraulic pump (34) are equalized.
6. Verfahren nach Anspruch 4, wobei über die Korrekturdaten Verschleiß des Hydromotors (14) oder der Hydropumpe (34) oder eine Änderung des Umfangs der Räder (2, 12) egalisiert werden. 6. The method of claim 4, wherein over the correction data wear of the hydraulic motor (14) or the hydraulic pump (34) or a change in the circumference of the wheels (2, 12) are equalized.
7. Verfahren nach einem der vorhergehenden Ansprüche mit dem Schritt: 7. The method according to any one of the preceding claims with the step:
- Modulation der Leistung der Hydropumpe (34) durch Ermittlung von Drücken in an die Hydropumpe (34) angeschlossen Arbeitsleitungen (38, 40). - Modulation of the power of the hydraulic pump (34) by determining pressures in the hydraulic pump (34) connected to working lines (38, 40).
8. Verfahren nach einem der vorhergehenden Ansprüche, wobei während des Fahrens des Fahrzeugs (1) ein Bescheunigen des Fahrzeugs (1) und ein 8. The method according to any one of the preceding claims, wherein during the driving of the vehicle (1) Bescheunigen the vehicle (1) and a
Verschwenken der Hydropumpe (34) bis zu einer maximalen Förderleistung der Swiveling the hydraulic pump (34) up to a maximum flow rate of
Hydropumpe (34) erfolgen. Hydropump (34) take place.
9. Verfahren nach einem der vorhergehenden Ansprüche, wobei das Steuergerät in einen Lernmodus geschaltet ist. 9. The method according to any one of the preceding claims, wherein the control unit is switched to a learning mode.
10. Fahrzeug (1) mit einem Fahrzeugantrieb, der einen Verbrennungsmotor (4) zum Antrieb eines ersten Rades (2) oder einer ersten Achse und einem hydrostatischen Zusatzantrieb (10) zum Antrieb eines zweiten Rades (12) oder einer zweiten Achse hat, wobei der hydrostatische Zusatzantrieb (10) eine vom Verbrennungsmotor (4) angetriebene verstellbaren Hydropumpe (34) und einen Hydromotor (14) hat, dadurch gekennzeichnet, dass in einem elektronischen Steuergerät Korrekturdaten des hydrostatischen Zusatzantriebs (10) abgespeichert sind, die beim Fahren des Fahrzeugs (1) auf Untergrund oder Boden oder beim Antreiben der Achsen auf einem Allradprüfstand ermittelt sind. 10. vehicle (1) with a vehicle drive, which has an internal combustion engine (4) for driving a first wheel (2) or a first axis and a hydrostatic auxiliary drive (10) for driving a second wheel (12) or a second axis, wherein the hydrostatic auxiliary drive (10) has an adjustable hydraulic pump (34) and a hydraulic motor (14) driven by the internal combustion engine (4), characterized in that correction data of the hydrostatic auxiliary drive (10) are stored in an electronic control unit which during driving of the vehicle ( 1) on the ground or ground or when driving the axles on an all-wheel drive test bench.
PCT/EP2012/002662 2011-06-29 2012-06-23 Method for optimizing a vehicle drive and vehicle having a correspondingly optimized vehicle drive WO2013000554A1 (en)

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