DE102009046369A1 - Device for preventing return of oil through fixed displacement pump of transmission of parallel hybrid vehicle, has free-wheel integrated in drive of pump, and torque emerging on pressure side by hydraulic pressure supported at housing - Google Patents

Device for preventing return of oil through fixed displacement pump of transmission of parallel hybrid vehicle, has free-wheel integrated in drive of pump, and torque emerging on pressure side by hydraulic pressure supported at housing Download PDF

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DE102009046369A1
DE102009046369A1 DE102009046369A DE102009046369A DE102009046369A1 DE 102009046369 A1 DE102009046369 A1 DE 102009046369A1 DE 102009046369 A DE102009046369 A DE 102009046369A DE 102009046369 A DE102009046369 A DE 102009046369A DE 102009046369 A1 DE102009046369 A1 DE 102009046369A1
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pump
fixed displacement
drive
displacement pump
oil
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Kai BORNTRÄGER
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ZF Friedrichshafen AG
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ZF Friedrichshafen AG
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    • 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
    • F16H61/0021—Generation or control of line pressure
    • F16H61/0025—Supply of control fluid; Pumps therefore
    • F16H61/0031—Supply of control fluid; Pumps therefore using auxiliary pumps, e.g. pump driven by a different power source than the engine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/36—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the transmission gearings
    • B60K6/365—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the transmission gearings with the gears having orbital motion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/40—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the assembly or relative disposition of components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/42—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
    • B60K6/48—Parallel type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/42—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
    • B60K6/48—Parallel type
    • B60K2006/4825—Electric machine connected or connectable to gearbox input shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/42—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
    • B60K6/48—Parallel type
    • B60K2006/4833—Step up or reduction gearing driving generator, e.g. to operate generator in most efficient speed range
    • 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
    • F16H61/20—Preventing gear creeping ; Transmission control during standstill, e.g. hill hold control
    • F16H2061/205—Hill hold control, e.g. with torque converter or a friction device slightly engaged to keep vehicle stationary
    • 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
    • F16H2312/00—Driving activities
    • F16H2312/02—Driving off
    • 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
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0434—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps ; Pressure control
    • F16H57/0436—Pumps
    • F16H57/0439—Pumps using multiple pumps with different power sources or a single pump with different power sources, e.g. one and the same pump may selectively be driven by either the engine or an electric motor
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Hybrid Electric Vehicles (AREA)
  • Control Of Transmission Device (AREA)

Abstract

The device has a free-wheel (11) integrated in a drive of a fixed displacement pump (2). The free-wheel is blocked in a forward direction and rotates freely during rearward rotation of the pump. Another free-wheel (12) is integrated in the drive of the pump, and blocks between a non movable component and a pump shaft (31) when the shaft rotates rearward to avoid rearward rotation of the pump by pressure of hydraulics. Torque emerging on a pressure side of the pump by the hydraulic pressure is supported at a housing of the pump, where the pump is driven by a spur gear stage or a chain drive.

Description

Die Erfindung bezieht sich auf eine Einrichtung zur Verhinderung der Rückförderung von Öl durch die Konstantpumpe des Getriebes bei Parallelhybridfahrzeugen mit hydraulischer Getriebesteuerung gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for preventing the return of oil through the constant pump of the transmission in parallel hybrid vehicles with hydraulic transmission control according to the preamble of patent claim 1.

Bei der Hybridisierung von Getrieben mit hydraulischer Getriebesteuerung werden oft zusätzlich zur vorhandenen Konstantpumpe des Getriebes elektrisch betriebene Pumpen eingesetzt. Da im Antriebsstrang abgeordnete elektrische Maschinen bei sehr geringen Drehzahlen ein Anfahren mit maximalem Drehmoment ermöglichen, kann eine von einer elektrischen Maschine angetriebene Konstantpumpe einerseits beim Anfahren in nachteiliger Weise keinen Druck aufbauen; andererseits ist in der Regel der Antrieb nur über eine elektrische Maschine erforderlich, wenn ein rein elektrischer Fahrbetrieb bei abgeschaltetem Verbrennungsmotor gewünscht ist. In diesen Fällen ist aus dem Stand der Technik bekannt, eine elektrische Zusatzpumpe oder einen Druckspeicher zu verwenden, der den für die Drehmomentübertragung erforderlichen hydraulischen Druck an den Schaltelementen des Getriebes bereitstellt.In the hybridization of transmissions with hydraulic transmission control often electrically operated pumps are used in addition to the existing fixed displacement pump of the transmission. Since in the powertrain second-order electric machines allow starting at maximum torque at very low speeds, a constant-displacement pump driven by an electric machine on the one hand can not build up a pressure disadvantageously when starting; On the other hand, the drive is usually required only via an electric machine, if a purely electric driving operation is desired when the engine is switched off. In these cases, it is known from the prior art to use an electric auxiliary pump or a pressure accumulator, which provides the required for the torque transmission hydraulic pressure to the switching elements of the transmission.

Hierbei kann es bei Anfahrvorgängen in der Steigung zu einem unerwünschten Zurückrollen des Fahrzeugs kommen, wenn das Fahrzeug nicht mit einer Rückrollverhinderung („hillholder”) ausgestattet ist; die Hillholder-Funktion gewährleistet, dass ein Losrollen des Fahrzeugs entgegengesetzt zu der vom Fahrer gewünschten Richtung verhindert wird. Beim Zurückrollen dreht die elektrische Maschine rückwärts, wenn der Vorwärtsgang eingelegt ist, wobei auch die Konstantpumpe der Getriebehydraulik rückwärts dreht und Öl aus der Getriebesteuerung zurück in den Ölsumpf fördert.This can lead to an undesirable roll-back of the vehicle when starting on the slope, if the vehicle is not equipped with a roll-back prevention ("hillholder"); the hill-holder function ensures that the vehicle is prevented from rolling in the opposite direction to the driver's desired direction. When rolling back, the electric machine turns backwards when the forward gear is engaged, and also the fixed gear of the transmission hydraulics rotates backwards and conveys oil from the transmission control back into the oil sump.

Wenn diese Rückfördermenge hoch genug ist und die elektrisch betriebene Zusatzpumpe nicht genügend Öl einspeisen kann, bricht der Systemdruck zusammen, was dazu führt, dass die Schaltelemente des Getriebes das Drehmoment nicht mehr übertragen können und durchrutschen. Anschließend baut die elektrische Maschine Drehzahl auf, so dass die Rückfördermenge der Konstantpumpe abnimmt und sich der Systemdruck aufbaut. Dadurch steigt die Drehmomentübertragungsfähigkeit und es wird im Getriebe wieder ein Kraftschluss hergestellt. Dies hat eine Erhöhung der Kupplungsbelastung durch unkontrollierten Schupfbetrieb, Antriebsstrangschwierigkeiten und ein starkes „Ruckeln” des Fahrzeugs zur Folge, wobei in Anhängigkeit von der Steigung das Fahrzeug in oder entgegen der gewünschten Fahrtrichtung fährt.If this return flow is high enough and the electrically operated booster pump can not supply enough oil, the system pressure collapses causing the gear shift elements to fail to transfer torque and slip. Subsequently, the electric machine builds up speed, so that the return flow of the constant pump decreases and the system pressure builds up. As a result, the torque transmission capability increases and it is again produced a frictional connection in the transmission. This results in an increase in clutch load due to uncontrolled shuffle operation, powertrain difficulties, and severe "bucking" of the vehicle, with the vehicle traveling in or against the desired direction of travel, depending on the grade.

Einrichtungen zur Rückrollverhinderung sind aus dem Stand der Technik bekannt; beispielsweise können Turbinenwellenfreiläufe eingesetzt werden, die keine Rückwärtsdrehung der Eingangswelle des Getriebes zulassen. Des weiteren ist bei Lastschaltgetrieben bekannt, durch Schließen eines weiteren Schaltelementes das Getriebe zu blockieren, wodurch ein Zurückrollen des Fahrzeugs verhindert wird. Ferner können zur Rückrollverhinderung Bremseingriffe an den Radbremsen des Fahrzeugs durchgeführt werden.Anti-rollback devices are known in the art; For example, turbine shaft freewheels can be used that do not allow reverse rotation of the input shaft of the transmission. Furthermore, it is known in powershift transmissions to block by closing a further switching element, the transmission, whereby a rolling back of the vehicle is prevented. Furthermore, braking operations on the wheel brakes of the vehicle can be carried out for roll-back prevention.

Bei Fahrzeugen mit Hybridantrieb besteht zusätzlich die Möglichkeit, ein Rückrollen des Fahrzeugs mittels des entsprechenden Betriebs der elektrischen Maschine zu verhindern, wobei bei Synchronmaschinen im Stillstand das Drehfeld steht und somit die Leistungselektronik in nachteiliger Weise eine hohe Strombelastung erfährt. Bei Asynchronmaschinen ist dieser Effekt nicht so stark ausgeprägt wie bei Synchronmaschinen, da sich durch den Schlupf auch im Stillstand ein Drehfeld ausbildet, resultiert aber dennoch darin, dass die Dauer einer Rückrollverhinderung mittels einer elektrischen Maschine mit maximalem Drehmoment zeitlich begrenzt ist.In vehicles with hybrid drive is also possible to prevent the vehicle from rolling back by means of the corresponding operation of the electric machine, with synchronous machines at a standstill, the rotating field and thus the power electronics disadvantageously experiences a high current load. In the case of asynchronous machines, this effect is not as pronounced as in synchronous machines, since slip forms a rotating field even at standstill, but nevertheless results in that the duration of a rollback prevention by means of an electric machine with maximum torque is limited in time.

Ferner erweist sich die Nutzung des Kurzschlussmomentes einer Synchronmaschine zur Rückrollverhinderung bei sehr niedrigen Drehzahlen als kritisch, da es nicht dem maximalen Drehmoment entspricht und somit nicht ausreichend ist, um in einer Grenzsteigung das Fahrzeug zu halten. Des weiteren fällt das Kurzschlussmoment schlagartig ab, was dazu führt, dass des Fahrzeug wie „losgerissen” zurückrollt. Furthermore, the use of the short-circuit torque of a synchronous machine for roll-back prevention at very low speeds proves to be critical, since it does not correspond to the maximum torque and thus is not sufficient to hold the vehicle in a limit gradient. Furthermore, the short-circuit torque drops abruptly, which causes the vehicle to roll back as if it had been "torn loose".

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Einrichtung zur Verhinderung der Rückförderung von Öl durch die Konstantpumpe des Getriebes bei Parallelhybridfahrzeugen mit hydraulischer Getriebesteuerung anzugeben, durch die beim Anfahren in Steigungen ein Zurückrollen mit kontinuierlichem Drehmomentaufbau möglich ist. Hierbei soll sich das Fahrzeug wie ein konventionelles Fahrzeug mit einem Wandlerautomatgetriebe verhalten. Insbesondere soll verhindert werden, dass die Konstantpumpe des Getriebes rückwärts dreht bzw. dass diese von der Zusatzpumpe in die Steuerung gefördertes Öl zurück in den Ölsumpf fördert.The present invention has for its object to provide a means for preventing the return flow of oil through the constant pump of the transmission in parallel hybrid vehicles with hydraulic transmission control, by the startup in gradients rolling back with continuous torque build-up is possible. Here, the vehicle should behave like a conventional vehicle with a converter automatic transmission. In particular, it is to be prevented that the fixed displacement pump of the transmission rotates backwards or that this promotes promoted by the auxiliary pump in the control oil back into the oil sump.

Diese Aufgabe wird durch die Merkmale der unabhängigen Patentansprüche 1 und 3 gelöst. Weitere erfindungsgemäße Ausgestaltungen und Vorteile gehen aus den entsprechenden Unteransprüchen hervor.This object is solved by the features of independent claims 1 and 3. Further embodiments and advantages of the invention will become apparent from the corresponding dependent claims.

Demnach wird im Rahmen einer ersten Ausführungsform der Erfindung vorgeschlagen, dass der Antrieb der Konstantpumpe der Getriebesteuerung über eine Stirnradstufe oder einen Kettenantrieb und einen ersten Freilauf erfolgt, der in Vorwärtsrichtung sperrt und beim Rückwärtsdrehen des Pumpenantriebs freiläuft.Accordingly, it is proposed in a first embodiment of the invention that the drive of the fixed displacement pump of the transmission control via a spur gear or a chain drive and a first freewheel takes place in the forward direction locks and freewheels when turning back the pump drive.

Gemäß der Erfindung ist zum Zweck der Verhinderung eines Rückwärtsdrehens der Konstantpumpe durch den Druck der Hydraulik ein zweiter Freilauf vorgesehen, der zwischen einem nicht beweglichen Bauteil – vorzugsweise zwischen dem Pumpengehäuse – und der Pumpenwelle sperrt, wenn die Pumpenwelle rückwärts dreht. Auf diese Weise kann das vom hydraulischen Druck auf der Druckseite der Pumpe entstehende Moment am Gehäuse der Pumpe abgestützt werden.According to the invention, for the purpose of preventing reverse rotation of the constant displacement pump by the pressure of the hydraulics, a second freewheel is provided which locks between a non-moving component, preferably between the pump housing and the pump shaft, when the pump shaft rotates backwards. In this way, the torque generated by the hydraulic pressure on the pressure side of the pump can be supported on the housing of the pump.

Gemäß einer zweiten Ausführungsform der Erfindung wird, um die der Erfindung zugrunde liegende Aufgabe zu lösen, nicht ein Rückwärtsdrehen der Konstantpumpe sondern das Entleeren der Steuerung durch die Konstantpumpe verhindert. Zu diesem Zweck umfasst die Einrichtung zur Verhinderung der Rückförderung von Öl durch die Konstantpumpe zwei in das hydraulische System integrierte Rückschlagventile wobei das erste Rückschlagventil bei Druckbeaufschlagung durch einen Volumenstrom von einer elektrisch betriebenen Zusatzpumpe den Kanal zur Konstantpumpe verschließt und wobei das zweite Rückschlagventil die Konstantpumpe bei Rückwärtsdrehung kurzschließt, wodurch die Erzeugung von Saugunterdruck verhindert wird. Dadurch wird in vorteilhafter Weise vermieden, dass die Saug- und Druckfilter entgegen der normalen Richtung durchströmt werden, was zum Kollabieren der Filter führen kann.According to a second embodiment of the invention, in order to solve the problem underlying the invention, not a reverse rotation of the constant pump but the emptying of the control by the constant pump prevented. For this purpose, the device for preventing the return of oil through the constant pump comprises two integrated check valves in the hydraulic system wherein the first check valve closes when pressurized by a volume flow from an electrically driven auxiliary pump the channel to the fixed displacement pump and wherein the second check valve, the fixed displacement pump in reverse rotation short circuits, thereby preventing the generation of suction vacuum. As a result, it is advantageously avoided that the suction and pressure filters are flowed through contrary to the normal direction, which can lead to the collapse of the filter.

Die Erfindung wird im folgenden anhand der beigefügten Figuren beispielhaft näher erläutert. Gleiche bzw. vergleichbare Bauteile sind dabei auch mit gleichen Bezugszeichen versehen. Es zeigen:The invention will be explained in more detail below with reference to the accompanying figures by way of example. Identical or comparable components are also provided with the same reference numerals. Show it:

1 eine Darstellung des Hydraulikschemas eines Parallelhybridfahrzeuges mit einer elektrisch betriebenen Zusatzpumpe nach dem Stand der Technik; 1 a representation of the hydraulic scheme of a parallel hybrid vehicle with an electrically operated auxiliary pump according to the prior art;

2 eine Darstellung des Hydraulikschemas eines Parallelhybridfahrzeuges mit einer elektrisch betriebenen Zusatzpumpe gemäß einer ersten Ausführungsform der Erfindung; 2 a representation of the hydraulic schematic of a parallel hybrid vehicle with an electrically operated auxiliary pump according to a first embodiment of the invention;

3 eine schematische Darstellung eines Antriebsstrangs mit einem gemäß 2 ausgeführten Pumpenantrieb der Konstantpumpe; und 3 a schematic representation of a drive train with a according to 2 executed pump drive of the fixed displacement pump; and

4 eine Darstellung des Hydraulikschemas eines Parallelhybridfahrzeuges mit einer elektrisch betriebenen Zusatzpumpe gemäß einer zweiten Ausführngsform der Erfindung. 4 a representation of the hydraulic schematic of a parallel hybrid vehicle with an electrically operated auxiliary pump according to a second Ausführngsform of the invention.

Hydraulikschemata von Parallelhybridfahrzeugen sind dem Fachmann bestens bekannt, so dass im Rahmen der Figurenbeschreibung nur die erfindungsrelevanten Bauteile beschrieben und erläutert werden.Hydraulic schemes of parallel hybrid vehicles are well known to those skilled in the art, so that in the description of the figures, only the components relevant to the invention are described and explained.

Bei dem in 1 dargestellten Hydraulikschema eines Parallelhybridfahrzeuges mit einer elektrisch betriebenen Zusatzpumpe nach dem Stand der Technik ist die Turbinenwelle mit 1, die Konstantpumpe mit 2 und die von einer elektrischen Maschine 4 angetriebene Zusatzpumpe mit 3 bezeichnet. Ferner sind Ventile 5, 6, 7 vorgesehen, wobei das Ventil 7 ein Umschaltventil ist, das Ventil 5 das Hauptdruckventil und das Ventil 6 ein Vorsteuerdruckregelventil ist. Hierbei bezeichnet pRHD den Hauptdruckvorsteuerdruck, pHD den Hauptdruck zur Drehmomentübertragung, der vorzugsweise Werte zwischen 3 und 19 bar annehmen kann, pD8 den Schmierdruck, pVF den Hauptdruck vor dem Druckfilter 8 und pZP den Druck der Zusatzpumpe 3. Ferner bezeichnet pD2 den Druck zum Betreiben eines elektrodynamischen Retarders und PR4 den Druck zum Kühl- und Schmierkreislauf. Des weiteren sind in der Figur Saugsiebe bzw. Saugfilter 9, 10 dargestellt.At the in 1 shown hydraulic schematic of a parallel hybrid vehicle with an electrically operated auxiliary pump according to the prior art, the turbine shaft with 1 , the constant pump with 2 and that of an electric machine 4 driven auxiliary pump with 3 designated. There are also valves 5 . 6 . 7 provided, the valve 7 a changeover valve is the valve 5 the main pressure valve and the valve 6 is a pilot pressure control valve. Here, pRHD denotes the main pressure pilot pressure, pHD the main pressure for torque transmission, which can preferably assume values between 3 and 19 bar, pD8 the lubricating pressure, pVF the main pressure upstream of the pressure filter 8th and pZP the pressure of the auxiliary pump 3 , Furthermore, pD2 designates the pressure for operating an electrodynamic retarder and PR4 the pressure for the cooling and lubricating circuit. Furthermore, in the figure Saugsiebe or suction filter 9 . 10 shown.

In einem derartig aufgebauten System kann die hydraulische Getriebesteuerung durch ein Rückwärtsdrehen der Konstantpumpe 2 bei einer Rückrollbewegung des Fahrzeugs entleert werden, wobei Öl aus der Getriebesteuerung zurück in den Ölsumpf gefördert wird, wie bereits erläutert. In der Figur wird der dadurch verursachte Druckabfall in der Getriebesteuerung durch die gestrichelte Linie B veranschaulicht, wobei der Pfeil A der Veranschaulichung des Volumenstroms von der Zusatzpumpe 3 zur Konstantpumpe 2 dient.In such a structured system, the hydraulic transmission control by a reverse rotation of the constant pump 2 be emptied during a rolling movement of the vehicle, with oil from the transmission control is conveyed back into the oil sump, as already explained. In the figure, the pressure drop caused thereby in the transmission control is illustrated by the dashed line B, wherein the arrow A is the illustration of the volume flow from the auxiliary pump 3 to the constant pump 2 serves.

Bei dem in 2 gezeigten erfindungsgemäßen Ausführungsbeispiel umfasst die Einrichtung zur Verhinderung der Rückförderung von Öl durch die Konstantpumpe 2 des Getriebes einen ersten in den Antrieb der Konstantpumpe 2 integrierten Freilauf 11, der in Vorwärtsrichtung sperrt und beim Rückwärtsdrehen des Pumpenantriebs freiläuft. Ferner umfasst die Einrichtung zur Verhinderung der Rückförderung von Öl einen zweiten Freilauf 12, der in den Antrieb der Konstantpumpe 2 integriert ist und zwischen dem Pumpengehäuse 13 und der Pumpenwelle 31 sperrt, wenn die Pumpenwelle 31 rückwärts dreht, um ein Rückwärtsdrehen der Konstantpumpe 2 durch den Druck der Hydraulik zu vermeiden, wodurch das durch den hydraulischen Druck auf der Druckseite der Pumpe 2 entstehende Moment am Gehäuse der Pumpe 2 abgestützt wird.At the in 2 shown embodiment of the invention comprises the means for preventing the return of oil through the constant pump 2 of the transmission a first in the drive of the constant pump 2 integrated freewheel 11 which locks in the forward direction and freewheels when the pump drive is reversed. Furthermore, the means for preventing the return of oil comprises a second freewheel 12 which is in the drive of the constant pump 2 is integrated and between the pump housing 13 and the pump shaft 31 locks when the pump shaft 31 turns backwards to reverse rotation of the constant pump 2 By avoiding the pressure of the hydraulics, which is caused by the hydraulic pressure on the pressure side of the pump 2 resulting moment on the housing of the pump 2 is supported.

Gegenstand der 3 ist eine schematische Darstellung eines Antriebsstrangs umfassend einen gemäß 2 ausgeführten Pumpenantrieb der Konstantpumpe 2 mit einem ersten Freilauf 11 und einem zweiten Freilauf 12. Der Aufbau des Getriebes ist aus dem Stand der Technik bekannt; das Getriebe 30 umfasst Planetensätze 14, 15, 16, die mittels Wellen und Schaltelementen 17, 18, 19, 20, 21 miteinander gekoppelt sind. In 3 ist die Antriebswelle mit dem Bezugszeichen 23 und die Abtriebswelle mit dem Bezugszeichen 22 versehen, wobei der Primärretarder mit dem Bezugszeichen 24 versehen ist.Subject of the 3 is a schematic representation of a powertrain comprising one according to 2 executed pump drive the constant pump 2 with a first freewheel 11 and a second freewheel 12 , The structure of the transmission is known from the prior art; The gear 30 includes planetary gear sets 14 . 15 . 16 by means of shafts and switching elements 17 . 18 . 19 . 20 . 21 coupled together. In 3 is the drive shaft by the reference numeral 23 and the output shaft by the reference numeral 22 provided, wherein the primary retarder by the reference numeral 24 is provided.

Ferner ist bei dem gezeigten Beispiel eine Kupplung 25 vorgesehen, welche die mit dem nichtdargestellten Verbrennungsmotor verbundene Antriebswelle 23 mit dem Antriebsstrang lösbar verbindet; wie aus 3 ersichtlich, ist die elektrische Maschine 4, welche auch die nicht dargestellte Zusatzpumpe antreibt, über einen Planetensatz 26 an den Antriebsstrang gekoppelt.Furthermore, in the example shown, a clutch 25 provided, which connected to the non-illustrated internal combustion engine drive shaft 23 detachably connected to the drive train; like out 3 Obviously, is the electric machine 4 , which also drives the auxiliary pump, not shown, via a planetary gear set 26 coupled to the drive train.

Bei dem in 4 gezeigten Beispiel umfasst die erfindungsgemäße Einrichtung zur Vermeidung der Rückförderung von Öl zwei in das hydraulische System integrierte Rückschlagventile 27, 28, wobei das Rückschlagventil 27 bei Druckbeaufschlagung durch einen Volumenstrom von einer elektrisch betriebenen Zusatzpumpe 3 den Kanal zur Konstantpumpe 2 verschließt und wobei das Rückschlagventil 28 die Konstantpumpe 2 bei Rückwärtsdrehung kurzschließt, wodurch die Erzeugung von Saugunterdruck verhindert wird. Hierbei wird in vorteilhafter Weise vermieden, dass die Saug- und Druckfilter 8, 9, 10 entgegen der normalen Richtung durchströmt werden. Hierbei ist das Rückschlagventil 27 in der Leitung zwischen der Zusatzpumpe 3 und der Konstantpumpe angeordnet, wobei das andere Rückschlagventil 28 in einem Kurzschlusskreislauf 29 der Konstantpumpe angeordnet ist.At the in 4 As shown, the inventive device for preventing the return of oil comprises two built-in hydraulic system check valves 27 . 28 , wherein the check valve 27 when pressurized by a volume flow of an electrically operated auxiliary pump 3 the channel to the constant pump 2 closes and wherein the check valve 28 the constant pump 2 shorts on reverse rotation, thereby preventing the generation of suction vacuum. In this case, it is advantageously avoided that the suction and pressure filters 8th . 9 . 10 to be flowed through in the normal direction. Here is the check valve 27 in the line between the auxiliary pump 3 and the constant-displacement pump, wherein the other non-return valve 28 in a short circuit 29 the fixed displacement pump is arranged.

In 4 ist der Förderstrom der Zusatzpumpe 3, der durch das Rückschlagventil 27 in Richtung auf die Konstantpumpe 2 bei Druckbeaufschlagung durch einen Volumenstrom von der elektrisch betriebenen Zusatzpumpe 3 verschlossen ist, durch den Pfeil C veranschaulicht, wobei Linie D den Kurzschluss der Konstantpumpe 2 durch das Rückschlagventil 28 für den Fall einer Rückwärtsdrehung der Konstantpumpe 2 verdeutlicht.In 4 is the flow rate of the auxiliary pump 3 passing through the check valve 27 towards the constant pump 2 when pressurized by a flow from the electrically operated auxiliary pump 3 is closed, illustrated by the arrow C, where line D is the short circuit of the constant pump 2 through the check valve 28 in the case of a reverse rotation of the fixed displacement pump 2 clarified.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Turbinenwelleturbine shaft
22
Konstantpumpefixed displacement pump
33
Zusatzpumpeadditional pump
44
elektrische Maschineelectric machine
55
HauptdruckventilMain pressure valve
66
VorsteuerdruckregelventilPilot pressure control valve
77
Umschaltventilswitching valve
88th
Druckfilterpressure filters
99
Saugsiebsuction strainer
1010
Saugsiebsuction strainer
1111
Freilauffreewheel
1212
Freilauffreewheel
1313
Pumpengehäusepump housing
1414
Planetensatzplanetary set
1515
Planetensatzplanetary set
1616
Planetensatzplanetary set
1717
Schaltelementswitching element
1818
Schaltelementswitching element
1919
Schaltelementswitching element
2020
Schaltelementswitching element
2121
Schaltelementswitching element
2222
Abtriebswelleoutput shaft
2323
Antriebswelledrive shaft
2424
Primärretarderprimary retarder
2525
Kupplungclutch
2626
Planetensatzplanetary set
2727
Rückschlagventilcheck valve
2828
Rückschlagventilcheck valve
2929
KurzschlusskreislaufShort circuit
3030
Getriebetransmission
3131
Pumpenwellepump shaft

Claims (4)

Einrichtung zur Verhinderung der Rückförderung von Öl durch die Konstantpumpe (2) des Getriebes bei Parallelhybridfahrzeugen mit hydraulischer Getriebesteuerung, dadurch gekennzeichnet, dass sie einen ersten in den Antrieb der Konstantpumpe (2) integrierten Freilauf (11) aufweist, der in Vorwärtsrichtung sperrt und beim Rückwärtsdrehen des Pumpenantriebs freiläuft, wobei die Einrichtung zur Verhinderung der Rückförderung von Öl einen zweiten in den Antrieb der Konstantpumpe (2) integrierten Freilauf (12) aufweist, der zwischen einem nicht beweglichen Bauteil und der Pumpenwelle (31) sperrt, wenn die Pumpenwelle (31) rückwärts dreht, um ein Rückwärtsdrehen der Konstantpumpe (2) durch den Druck der Hydraulik zu vermeiden, wodurch das durch den hydraulischen Druck auf der Druckseite der Pumpe (2) entstehende Moment am Gehäuse der Pumpe (2) abgestützt wird.Device for preventing the return of oil through the fixed displacement pump ( 2 ) of the transmission in parallel hybrid vehicles with hydraulic transmission control, characterized in that they have a first in the drive of the fixed displacement pump ( 2 ) integrated freewheel ( 11 ) which locks in the forward direction and freewheels in reverse rotation of the pump drive, wherein the means for preventing the return of oil a second in the drive of the constant pump ( 2 ) integrated freewheel ( 12 ) between a non-moving component and the pump shaft ( 31 ) locks when the pump shaft ( 31 ) turns backwards to reverse rotation of the fixed displacement pump ( 2 ) by the pressure of the hydraulic system, whereby the hydraulic pressure on the pressure side of the pump ( 2 ) arising moment on the housing of the pump ( 2 ) is supported. Einrichtung zur Verhinderung der Rückförderung von Öl durch die Konstantpumpe (2) des Getriebes bei Parallelhybridfahrzeugen mit hydraulischer Getriebesteuerung, nach Anspruch 1 dadurch gekennzeichnet, dass der zweite Freilauf (12) zwischen dem Pumpengehäuse (13) und der Pumpenwelle (31) sperrt, wenn die Pumpenwelle (31) rückwärts dreht.Device for preventing the return of oil through the fixed displacement pump ( 2 ) of the transmission in parallel hybrid vehicles with hydraulic transmission control, according to claim 1, characterized in that the second freewheel ( 12 ) between the pump housing ( 13 ) and the pump shaft ( 31 ) locks when the pump shaft ( 31 ) turns backwards. Einrichtung zur Verhinderung der Rückförderung von Öl durch die Konstantpumpe (2) des Getriebes bei Parallelhybridfahrzeugen mit hydraulischer Getriebesteuerung, dadurch gekennzeichnet, dass sie zwei in das hydraulische System integrierte Rückschlagventile (27, 28) umfasst, wobei ein erstes Rückschlagventil (27) bei Druckbeaufschlagung durch einen Volumenstrom von einer elektrisch betriebenen Zusatzpumpe (3) den Kanal zwischen der Zusatzpumpe (3) und der Konstantpumpe (2) verschließt und wobei ein zweites Rückschlagventil (28), das in einem Kurzschlusskreislauf (29) der Konstantpumpe (2) angeordnet ist, die Konstantpumpe (2) bei einer Rückwärtsdrehung der Konstantpumpe (2) kurzschließt.Device for preventing the return of oil through the fixed displacement pump ( 2 ) of the transmission in parallel hybrid vehicles with hydraulic transmission control, characterized in that it comprises two non-return valves integrated into the hydraulic system ( 27 . 28 ), wherein a first check valve ( 27 ) when pressurized by a volume flow from an electrically operated auxiliary pump ( 3 ) the channel between the auxiliary pump ( 3 ) and the constant pump ( 2 ) and wherein a second check valve ( 28 ) that in a short circuit ( 29 ) of the fixed displacement pump ( 2 ), the fixed displacement pump ( 2 ) during a reverse rotation of the fixed displacement pump ( 2 ) short circuits. Einrichtung zur Verhinderung der Rückförderung von Öl durch die Konstantpumpe (2) des Getriebes bei Parallelhybridfahrzeugen mit hydraulischer Getriebesteuerung, nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, dass die Konstantpumpe (2) über eine Stirnradstufe oder einen Kettenantrieb angetrieben wird.Device for preventing the return of oil through the fixed displacement pump ( 2 ) of the transmission in parallel hybrid vehicles with hydraulic transmission control, according to claim 1, 2 or 3, characterized in that the fixed displacement pump ( 2 ) is driven via a spur gear or a chain drive.
DE102009046369A 2009-11-04 2009-11-04 Device for preventing return of oil through fixed displacement pump of transmission of parallel hybrid vehicle, has free-wheel integrated in drive of pump, and torque emerging on pressure side by hydraulic pressure supported at housing Withdrawn DE102009046369A1 (en)

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CN109282028A (en) * 2018-11-22 2019-01-29 广州汽车集团股份有限公司 Hybrid vehicle hydraulic control system and its control method

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