WO2012168596A1 - Hydraulic drive system for a motor vehicle - Google Patents

Hydraulic drive system for a motor vehicle Download PDF

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Publication number
WO2012168596A1
WO2012168596A1 PCT/FR2012/050622 FR2012050622W WO2012168596A1 WO 2012168596 A1 WO2012168596 A1 WO 2012168596A1 FR 2012050622 W FR2012050622 W FR 2012050622W WO 2012168596 A1 WO2012168596 A1 WO 2012168596A1
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WO
WIPO (PCT)
Prior art keywords
hydraulic
vehicle
accumulator
accumulators
pressure
Prior art date
Application number
PCT/FR2012/050622
Other languages
French (fr)
Inventor
Pascal Gateau
Nelson Fiorini
Francois CATTIEUW
Marc Giannoni
Original Assignee
Peugeot Citroen Automobiles Sa
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Filing date
Publication date
Application filed by Peugeot Citroen Automobiles Sa filed Critical Peugeot Citroen Automobiles Sa
Publication of WO2012168596A1 publication Critical patent/WO2012168596A1/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
    • 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
    • B60K17/14—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing the motor of fluid or electric gearing being disposed in or adjacent to traction wheel
    • 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
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/08—Prime-movers comprising combustion engines and mechanical or fluid energy storing means
    • B60K6/12—Prime-movers comprising combustion engines and mechanical or fluid energy storing means by means of a chargeable fluidic accumulator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00—Special features of vehicle units
    • B60Y2400/14—Hydraulic energy storages, e.g. hydraulic accumulators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles

Definitions

  • the present invention relates to a hydraulic motorization system for a motor vehicle, and a hybrid vehicle equipped with such a motorization system.
  • the invention relates to a hydraulic motorization system for a motor vehicle, comprising a motor for producing mechanical energy, a hydraulic pump driven by this motor to recharge pressure accumulators, and at least one hydraulic machine and traction which is adapted to drive the driving wheels of the vehicle and which is controlled by a hydraulic block connected to these pressure accumulators.
  • a problem for such vehicles having a reserve of fluid under pressure is to integrate pressure accumulators in the vehicle, which have a sufficient volume while occupying little space.
  • another problem is that there must be connecting pipes between the various components, including pressure accumulators, the hydraulic control unit and the engine or engines consuming this pressure, which require tubes comprising connection means arranged at the ends.
  • Binding lines result in purchase and installation costs on the vehicle. Moreover, by connecting together separately fixed components, which can be subjected to vibrations, the connecting pipes have risks of leakage or rupture due in particular to the mechanical stresses that apply to the tubes and connecting means undergoing alternating bending.
  • the hydraulic machine comprises units, connected to two driving wheels of the same axle of the vehicle. These units can operate as a motor to deliver mechanical power to the wheels by taking energy stored in the pressure accumulators, or as a pump to recharge these pressure accumulators during braking of the vehicle, in order to recover at least part of the kinetic energy of the vehicle.
  • An internal combustion engine type generator and compressors also make it possible to recharge the accumulators.
  • Hydraulic energy storage also makes it possible to drive in hydraulic mode alone without emission of polluting gas, called "ZEV" mode, the heat engine remaining at a standstill.
  • the present invention is intended to overcome the disadvantages of the prior art.
  • the subject of the invention is a hydraulic motorization system for a motor vehicle, comprising a mechanical power generation engine, a hydraulic pump driven by this engine to recharge pressure accumulators, and at least one hydraulic traction machine which is adapted to drive the driving wheels of the vehicle and which is controlled by a hydraulic block connected to these pressure accumulators.
  • the pressure accumulators and the hydraulic block are connected directly together forming a rigid hydraulic subassembly and on the other hand the hydraulic traction machine is dissociated from said rigid hydraulic subassembly while being connected. directly with a differential to form a rigid subset of traction.
  • the rigid traction subassembly comprises a gearbox interposed between the hydraulic traction machine and the differential;
  • the hydraulic traction machine comprises two hydraulic motors
  • the pressure accumulators comprise an elongated tubular shape, one of the accumulators being arranged to be arranged longitudinally along the axis of the vehicle, under the floor of this vehicle, the other of the accumulators being fixed transversely on the longitudinal accumulator;
  • the longitudinal accumulator is a high pressure accumulator, and the accumulator arranged transversely is a low pressure accumulator;
  • the motor driving the hydraulic pump is a heat engine.
  • the subject of the invention is also a motor vehicle comprising a hydraulic motorization system comprising a motor for producing mechanical energy, a hydraulic pump driven by this motor for recharging pressure accumulators, and at least one hydraulic traction machine connected to drive with the drive wheels of the vehicle and which is controlled by a hydraulic block connected to these pressure accumulators.
  • the hydraulic drive system is according to the invention so that the hydraulic machine can move the vehicle by driving the drive wheels.
  • its hydraulic drive system is in accordance with the invention having one of its accumulators arranged longitudinally along the axis of the vehicle, under the floor of this vehicle in a central tunnel, the other its accumulators being fixed transversely on the longitudinal accumulator.
  • its accumulator arranged transversely is located under seats provided for rear passengers of the vehicle.
  • the hydraulic traction machine is connected to the drive wheels of the vehicle that are at its front end.
  • the hydraulic drive system is according to the invention having its longitudinal accumulator which is a high pressure accumulator whose front end is oriented towards the drive wheels and its accumulator arranged transversely which is a low pressure accumulator, to the rear end of the longitudinal accumulator of high pressure.
  • Figure 1 is a diagram of a first embodiment of a hydraulic drive system according to the invention
  • Figure 2 is a schematic view from below, of a motor vehicle comprising the engine system;
  • Figure 3 is a diagram of a second embodiment of a hydraulic drive system according to the invention.
  • FIG. 1 shows a hybrid vehicle comprising a heat engine 2 producing mechanical energy for driving, by a direct mechanical connection, a hydraulic pump 4 connected to a hydraulic control unit 8 by means of high-pressure and low-pressure pipes 11.
  • the hydraulic block 8 is also connected by high pressure lines 13 and low pressure 14 to two hydraulic motors 18.
  • These hydraulic motors 18 constitute a traction machine which is driven by the hydraulic block 8 to drive the driving wheels 30 of the same axle of the vehicle, here the wheels of the front axle.
  • This driving wheel drive is performed by transmission of torque in a gearing unit 31 comprising a gearbox and a differential that distributes the movement towards these two wheels 30.
  • the gearbox for example epicyclic gear train, and the differential are of classic type.
  • the gearbox has an inlet for each hydraulic motor 18, for example at each end of the same shaft.
  • the displacement of the hydraulic motors 18, for example of the order of 15 to 30 cm3, must be such that these engines can move the vehicle alone, given that the reduction of the gearbox can be adapted to the traffic conditions. of the vehicle.
  • the gearbox is advantageously controlled by hydraulic actuators supplied with energy for example by the accumulators via the hydraulic control unit 8.
  • the hydraulic block 8 is further connected by a rigid coupling 8A to a hydraulic high pressure accumulator 33 which is also connected by a rigid connection 33A to a low pressure accumulator 34 ( Figure 2).
  • a rigid coupling 8A to a hydraulic high pressure accumulator 33 which is also connected by a rigid connection 33A to a low pressure accumulator 34 ( Figure 2).
  • the pressure accumulators 33, 34 and the hydraulic block 8 are connected directly together forming a rigid hydraulic subassembly.
  • the front hydraulic block 8 is directly connected by a high pressure internal pipe to the high pressure accumulator 33, in the connection 8A. At least one high pressure internal pipe directly connects the high pressure accumulator 33 to the low pressure accumulator 34, in the connection 33A. These internal ducts are very short and as they connect two components held together rigidly, they can themselves be rigid which is favorable to increase reliability and reduce costs.
  • a low pressure line 36 for example flexible, externally connects the low pressure accumulator 34 remote from the hydraulic block 8.
  • the different housings of the hydraulic block 8 and accumulators are connected together.
  • Fluid remains in the hydraulic circuit which is closed between the hydraulic pump 4, the hydraulic control unit 8, the hydraulic motors 18, the accumulators 33, 34 and the pipes 11, 12, 13, 14, 36.
  • the fluid passes from one to the other accumulators 33, 34 in case of charging or discharging, so as to maintain a minimum pressure in this circuit.
  • the vehicle is of the type called hybrid series comprising a hydrostatic transmission whose main components include the hydraulic motor 18, the hydraulic block 8 and the pressure accumulators 33, 34.
  • the pressure accumulators 33, 34 each constitute an elongated tube of reduced circular section, which is favorable for limiting the stresses in this accumulator.
  • the high pressure accumulator 33 is disposed under the floor of the vehicle, longitudinally in the axis of this vehicle.
  • the low pressure accumulator 34 is fixed rigidly to the rear end of this high pressure accumulator 33, being disposed substantially transversely thereto.
  • this hydraulic subassembly having a generally "T" shape advantageously comprises a longitudinal portion disposed under the floor 50, in a longitudinal tunnel 52, and a transverse portion disposed in a transverse recess 54 available under the seats provided for rear passengers of the vehicle.
  • This type of tunnel is often provided in certain vehicles to receive an exhaust tube and this type of transverse recess is often provided in certain vehicles to receive a fuel tank.
  • the longitudinal tunnel 52 is between two substantially flat longitudinal portions 56 of the floor 50 under the seats provided for the front passengers of the vehicle and under the foot cellars provided for the rear passengers of the vehicle. At their front section, these longitudinal portions 56 comprise reinforcements 56A between which is the hydraulic block 8 to be fixed at a distance from the front suspension arm 58.
  • the longitudinal tunnel 52 is spaced from longitudinal longitudinal members 62 allowing the rigidity of the floor 50 which carries the hydraulic subassembly in general "T" shape.
  • a first intermediate floor cross 64 is present at the connection 33A.
  • the vehicle structure also comprises a second intermediate cross member 66 which is connected to rear longitudinal members 68 which serve to fasten the rear tainter 70 to the rear arm 72 and transverse bar 74.
  • Anchors 34A of the hydraulic subassembly in the general shape of " T ", at the level of the low-pressure accumulator 34, are between the first intermediate floor cross-member 64 and the second intermediate structural cross-member 66, at a location where these cross-members stiffen the floor 50.
  • the hydraulic connections in the circuit are simplified and include a reduced number of flexible pipes, which limits costs and increases reliability.
  • the heat engine 2 and its hydraulic pump 4 constitute a generator subassembly fixed front of the vehicle body independently to the rigid hydraulic subassembly which is fixed substantially in the center of the vehicle.
  • This pump 4 is connected to the front hydraulic block 8 by the high pressure 11 and low pressure lines 12 which are flexible to allow some flexibility of architecture for its implementation in direct connection with the engine 2.
  • a single hydraulic motor 18 constitutes the vehicle traction machine, at the input of the gearbox 31.
  • the number of pipe sections between the hydraulic block 8 and the traction machine is reduced since there is only one motor to feed.
  • the hydraulic motor 18 is here of greater displacement than each of the corresponding engines of the first embodiment of the invention described with reference to FIG.
  • the mechanical driving power of the hydraulic pump 4 for generating the hydraulic pressure can be delivered by an electric motor in place of the heat engine.
  • the engine or electric motor can be mounted in the vehicle at different locations, including the following positions, front overhang, front center, rear center, or rear overhang.

Abstract

The invention relates to a hydraulic drive system for a motor vehicle, including a motor for producing mechanical energy (2), a hydraulic pump (4) driven by said motor in order to recharge pressure accumulators (33, 34), and at least one hydraulic traction machine (18), which is suitable for driving drive wheels (30) of the vehicle, and which is controlled by a hydraulic unit (8) connected to said pressure accumulators. The pressure accumulators (33, 34) and the hydraulic unit (8) are directly connected to each other, thereby forming a rigid hydraulic subassembly. The hydraulic traction machine (18) is disconnected from said rigid hydraulic subassembly, while being directly connected to a differential in order to form a rigid traction subassembly. A gearbox system is positioned between the hydraulic traction machine and the differential. The invention also relates to a vehicle provided with such a system.

Description

"SYSTEME DE MOTORISATION HYDRAULIQUE POUR VEHICULE AUTOMOBILE"  "HYDRAULIC MOTORIZATION SYSTEM FOR MOTOR VEHICLE"
La présente invention est relative à un système de motorisation hydraulique pour véhicule automobile, ainsi qu'un véhicule hybride équipé d'un tel système de motorisation . The present invention relates to a hydraulic motorization system for a motor vehicle, and a hybrid vehicle equipped with such a motorization system.
Plus particulièrement, l'invention concerne un système de motorisation hydraulique pour véhicule automobile, comprenant un moteur de production d'énergie mécanique, une pompe hydraulique entraînée par ce moteur pour recharger des accumulateurs de pression, et au moins et au moins une machine hydraulique de traction qui est adaptée à entraîner des roues motrices du véhicule et qui est commandé par un bloc hydraulique relié à ces accumulateurs de pression.  More particularly, the invention relates to a hydraulic motorization system for a motor vehicle, comprising a motor for producing mechanical energy, a hydraulic pump driven by this motor to recharge pressure accumulators, and at least one hydraulic machine and traction which is adapted to drive the driving wheels of the vehicle and which is controlled by a hydraulic block connected to these pressure accumulators.
Ce type de système est connu pour être adapté à équiper des véhicules hybrides appelés « hybrides série » dont les roues sont entraînées par le moteur hydraulique et le moteur formant une source d'énergie mécanique pour la pompe hydraulique qui charge des accumulateurs de pression pour stocker cette énergie sous la forme de pression hydraulique.  This type of system is known to be adapted to equip hybrid vehicles called "series hybrids" whose wheels are driven by the hydraulic motor and the motor forming a source of mechanical energy for the hydraulic pump that charges pressure accumulators to store this energy in the form of hydraulic pressure.
Un problème pour de tels véhicules comportant une réserve de fluide sous pression, est d'intégrer des accumulateurs de pression dans le véhicule, qui comportent un volume suffisant tout en occupant peu de place. En outre, un autre problème est qu'il faut prévoir des canalisations de liaison entre les différents composants, notamment les accumulateurs de pression, le bloc hydraulique de commande et le ou les moteurs consommant cette pression, qui nécessitent des tubes comprenant des moyens de raccordement disposés aux extrémités .  A problem for such vehicles having a reserve of fluid under pressure, is to integrate pressure accumulators in the vehicle, which have a sufficient volume while occupying little space. In addition, another problem is that there must be connecting pipes between the various components, including pressure accumulators, the hydraulic control unit and the engine or engines consuming this pressure, which require tubes comprising connection means arranged at the ends.
Les canalisations de liaison entraînent des coûts d'achat et d'installation sur le véhicule. De plus en reliant entre eux des composants fixés séparément, qui peuvent être soumis à des vibrations, les canalisations de liaison comportent des risques de fuite ou de rupture dus notamment aux contraintes mécaniques qui s'appliquent sur les tubes et les moyens de raccordements subissant des flexions alternées. Binding lines result in purchase and installation costs on the vehicle. Moreover, by connecting together separately fixed components, which can be subjected to vibrations, the connecting pipes have risks of leakage or rupture due in particular to the mechanical stresses that apply to the tubes and connecting means undergoing alternating bending.
Pour cela, il est connu de réaliser un type d'accumulateur de pression de fluide, présenté notamment par le document US-A1-2004/0219031, comportant un ensemble de formes tubulaires reliées entre elles en s 'étendant horizontalement. Les réservoirs sont obtenus dans des éléments qui ont aussi une fonction de structure du véhicule, sous le plancher de ce dernier. Cette disposition permet d'occuper une position sous le véhicule, qui prend peu d'espace dans l'habitacle de ce véhicule.  For this, it is known to produce a type of fluid pressure accumulator, presented in particular by the document US-A1-2004 / 0219031, comprising a set of tubular shapes interconnected by extending horizontally. The tanks are obtained in elements that also have a vehicle structure function, under the floor of the latter. This arrangement allows to occupy a position under the vehicle, which takes up little space in the passenger compartment of this vehicle.
Dans ce document, la machine hydraulique comprend des unités, reliées à deux roues motrices d'un même essieu du véhicule. Ces unités peuvent fonctionner en moteur pour délivrer une puissance mécanique aux roues en prélevant de l'énergie stockée dans les accumulateurs de pression, ou en pompe pour recharger ces accumulateurs de pression lors des freinages du véhicule, afin de récupérer au moins en partie l'énergie cinétique du véhicule. Un générateur de type moteur thermique à combustion interne et des compresseurs permettent aussi de recharger les accumulateurs.  In this document, the hydraulic machine comprises units, connected to two driving wheels of the same axle of the vehicle. These units can operate as a motor to deliver mechanical power to the wheels by taking energy stored in the pressure accumulators, or as a pump to recharge these pressure accumulators during braking of the vehicle, in order to recover at least part of the kinetic energy of the vehicle. An internal combustion engine type generator and compressors also make it possible to recharge the accumulators.
Ce type de véhicule permet d'optimiser le fonctionnement du moteur thermique, afin de réduire sa consommation ainsi que les émissions de gaz polluants. Le stockage d'énergie hydraulique permet aussi de rouler en mode hydraulique seul sans émission de gaz polluant, appelé mode « ZEV », le moteur thermique restant à 1 ' arrêt .  This type of vehicle optimizes the operation of the engine, to reduce its consumption and emissions of gaseous pollutants. Hydraulic energy storage also makes it possible to drive in hydraulic mode alone without emission of polluting gas, called "ZEV" mode, the heat engine remaining at a standstill.
La présente invention a notamment pour but de remédier aux inconvénients de l'art antérieur.  The present invention is intended to overcome the disadvantages of the prior art.
A cet effet, l'invention a pour objet un système de motorisation hydraulique pour véhicule automobile, comprenant un moteur de production d'énergie mécanique, une pompe hydraulique entraînée par ce moteur pour recharger des accumulateurs de pression, et au moins une machine hydraulique de traction qui est adaptée à entraîner des roues motrices du véhicule et qui est commandée par un bloc hydraulique relié à ces accumulateurs de pression. Dans ce système, d'une part les accumulateurs de pression et le bloc hydraulique sont reliés directement entre eux en formant un sous-ensemble hydraulique rigide et d'autre part la machine hydraulique de traction est dissociée dudit sous-ensemble hydraulique rigide en étant reliée directement avec un différentiel pour former un sous-ensemble rigide de traction. For this purpose, the subject of the invention is a hydraulic motorization system for a motor vehicle, comprising a mechanical power generation engine, a hydraulic pump driven by this engine to recharge pressure accumulators, and at least one hydraulic traction machine which is adapted to drive the driving wheels of the vehicle and which is controlled by a hydraulic block connected to these pressure accumulators. In this system, on the one hand the pressure accumulators and the hydraulic block are connected directly together forming a rigid hydraulic subassembly and on the other hand the hydraulic traction machine is dissociated from said rigid hydraulic subassembly while being connected. directly with a differential to form a rigid subset of traction.
Dans divers modes de réalisation du système selon l'invention, on peut éventuellement avoir recours en outre à l'une et/ou à l'autre des dispositions suivantes :  In various embodiments of the system according to the invention, one or more of the following provisions may also be used:
le sous-ensemble rigide de traction comporte une boîte de vitesses interposée entre la machine hydraulique de traction et le différentiel ;  the rigid traction subassembly comprises a gearbox interposed between the hydraulic traction machine and the differential;
la machine hydraulique de traction comprend deux moteurs hydrauliques ;  the hydraulic traction machine comprises two hydraulic motors;
les accumulateurs de pression comportent une forme tubulaire allongée, l'un des accumulateurs étant prévu pour être disposé longitudinalement suivant l'axe du véhicule, sous le plancher de ce véhicule, l'autre des accumulateurs étant fixé transversalement sur l'accumulateur longitudinal ;  the pressure accumulators comprise an elongated tubular shape, one of the accumulators being arranged to be arranged longitudinally along the axis of the vehicle, under the floor of this vehicle, the other of the accumulators being fixed transversely on the longitudinal accumulator;
- l'accumulateur longitudinal est un accumulateur haute pression, et l'accumulateur disposé transversalement est un accumulateur basse pression ;  - The longitudinal accumulator is a high pressure accumulator, and the accumulator arranged transversely is a low pressure accumulator;
le moteur entraînant la pompe hydraulique est un moteur thermique.  the motor driving the hydraulic pump is a heat engine.
Par ailleurs, l'invention a également pour objet un véhicule automobile comportant un système de motorisation hydraulique comprenant un moteur de production d'énergie mécanique, une pompe hydraulique entraînée par ce moteur pour recharger des accumulateurs de pression, et au moins une machine hydraulique de traction reliée à entraînement avec les roues motrices du véhicule et qui est commandée par un bloc hydraulique relié à ces accumulateurs de pression. Dans ce véhicule, le système de motorisation hydraulique est conforme à l'invention pour que la machine hydraulique puisse mouvoir le véhicule en entraînant les roues motrices. Furthermore, the subject of the invention is also a motor vehicle comprising a hydraulic motorization system comprising a motor for producing mechanical energy, a hydraulic pump driven by this motor for recharging pressure accumulators, and at least one hydraulic traction machine connected to drive with the drive wheels of the vehicle and which is controlled by a hydraulic block connected to these pressure accumulators. In this vehicle, the hydraulic drive system is according to the invention so that the hydraulic machine can move the vehicle by driving the drive wheels.
Dans un mode de réalisation du véhicule, son système de motorisation hydraulique est conforme à l'invention en ayant l'un de ses accumulateurs disposé longitudinalement suivant l'axe du véhicule, sous le plancher de ce véhicule dans un tunnel central, l'autre de ses accumulateurs étant fixé transversalement sur l'accumulateur longitudinal.  In one embodiment of the vehicle, its hydraulic drive system is in accordance with the invention having one of its accumulators arranged longitudinally along the axis of the vehicle, under the floor of this vehicle in a central tunnel, the other its accumulators being fixed transversely on the longitudinal accumulator.
Dans un mode de réalisation du véhicule, son accumulateur disposé transversalement est situé sous des sièges prévus pour des passagers arrière du véhicule.  In one embodiment of the vehicle, its accumulator arranged transversely is located under seats provided for rear passengers of the vehicle.
Dans un mode de réalisation du véhicule, la machine hydraulique de traction est reliée aux roues motrices du véhicule qui sont à son train avant. Dans ce véhicule, le système de motorisation hydraulique est conforme à l'invention en ayant son accumulateur longitudinal qui est un accumulateur haute pression dont l'extrémité avant est orientée vers les roues motrices et son accumulateur disposé transversalement qui est un accumulateur basse pression, à l'extrémité arrière de l'accumulateur longitudinal de haute pression.  In one embodiment of the vehicle, the hydraulic traction machine is connected to the drive wheels of the vehicle that are at its front end. In this vehicle, the hydraulic drive system is according to the invention having its longitudinal accumulator which is a high pressure accumulator whose front end is oriented towards the drive wheels and its accumulator arranged transversely which is a low pressure accumulator, to the rear end of the longitudinal accumulator of high pressure.
D'autres buts, caractéristiques et avantages de l'invention apparaîtront au cours de la description suivante de plusieurs modes de réalisation, donnés à titre d'exemples non limitatifs, en regard des dessins j oints .  Other objects, features and advantages of the invention will become apparent from the following description of several embodiments, given by way of non-limiting examples, with reference to the accompanying drawings.
Sur les dessins :  On the drawings:
- la figure 1 est un schéma d'un premier mode de réalisation d'un système de motorisation hydraulique selon l'invention ; la figure 2 est une en vue schématique de dessous, d'un véhicule automobile comprenant ce système de motorisation ; - Figure 1 is a diagram of a first embodiment of a hydraulic drive system according to the invention; Figure 2 is a schematic view from below, of a motor vehicle comprising the engine system;
la figure 3 est un schéma d'un second mode de réalisation d'un système de motorisation hydraulique selon l'invention.  Figure 3 is a diagram of a second embodiment of a hydraulic drive system according to the invention.
Sur les différentes figures, les mêmes références désignent des éléments identiques ou similaires. Dans la description qui va suivre, la direction désignée comme longitudinale correspond à l'axe d'avancement d'un véhicule qui sert ici de référentiel.  In the different figures, the same references designate identical or similar elements. In the following description, the direction designated as longitudinal corresponds to the axis of advance of a vehicle which serves here as a reference.
La figure 1 présente un véhicule hybride comprenant un moteur thermique 2 produisant de l'énergie mécanique pour entraîner par une liaison mécanique directe, une pompe hydraulique 4 reliée à un bloc hydraulique 8 de commande par des canalisations haute pression 11 et basse pression 12.  FIG. 1 shows a hybrid vehicle comprising a heat engine 2 producing mechanical energy for driving, by a direct mechanical connection, a hydraulic pump 4 connected to a hydraulic control unit 8 by means of high-pressure and low-pressure pipes 11.
Le bloc hydraulique 8 est aussi relié par des canalisations haute pression 13 et basse pression 14 à deux moteurs hydrauliques 18. Ces moteurs hydrauliques 18 constituent une machine de traction qui est pilotée par le bloc hydraulique 8 pour entraîner les roues motrices 30 d'un même essieu du véhicule, ici les roues du train avant. Cet entraînement des roues motrices est effectué par transmission de couple dans une unité de démultiplication 31 comportant une boîte de vitesses et un différentiel qui répartit le mouvement vers ces deux roues 30. La boîte de vitesses, par exemple à train épicycloïdal , et le différentiel sont de type classique. La boîte de vitesses comporte une entrée pour chaque moteur hydraulique 18, par exemple à chacune des extrémités d'un même arbre. La cylindrée des moteurs hydrauliques 18, par exemple de l'ordre de 15 à 30 cm3, doit être telle que ces moteurs puissent mouvoir à eux seuls le véhicule, compte tenu que la démultiplication de la boîte de vitesses peut être adaptée aux conditions de circulation du véhicule. La boîte de vitesses est avantageusement commandée par des actionneurs hydrauliques alimentés en énergie par exemple par les accumulateurs via le bloc hydraulique de commande 8. The hydraulic block 8 is also connected by high pressure lines 13 and low pressure 14 to two hydraulic motors 18. These hydraulic motors 18 constitute a traction machine which is driven by the hydraulic block 8 to drive the driving wheels 30 of the same axle of the vehicle, here the wheels of the front axle. This driving wheel drive is performed by transmission of torque in a gearing unit 31 comprising a gearbox and a differential that distributes the movement towards these two wheels 30. The gearbox, for example epicyclic gear train, and the differential are of classic type. The gearbox has an inlet for each hydraulic motor 18, for example at each end of the same shaft. The displacement of the hydraulic motors 18, for example of the order of 15 to 30 cm3, must be such that these engines can move the vehicle alone, given that the reduction of the gearbox can be adapted to the traffic conditions. of the vehicle. The gearbox is advantageously controlled by hydraulic actuators supplied with energy for example by the accumulators via the hydraulic control unit 8.
Le bloc hydraulique 8 est relié de plus par un raccord rigide 8A à un accumulateur hydraulique de haute pression 33 qui est aussi relié par un raccord rigide 33A à un accumulateur de basse pression 34 (figure 2) . Ainsi, les accumulateurs de pression 33, 34 et le bloc hydraulique 8 sont reliés directement entre eux en formant un sous-ensemble hydraulique rigide.  The hydraulic block 8 is further connected by a rigid coupling 8A to a hydraulic high pressure accumulator 33 which is also connected by a rigid connection 33A to a low pressure accumulator 34 (Figure 2). Thus, the pressure accumulators 33, 34 and the hydraulic block 8 are connected directly together forming a rigid hydraulic subassembly.
Le bloc hydraulique avant 8 est directement relié par un conduit interne haute pression à l'accumulateur haute pression 33, dans le raccord 8A. Au moins un conduit interne de haute pression relie directement l'accumulateur de haute pression 33 à l'accumulateur de basse pression 34, dans le raccord 33A. Ces conduits internes sont très courts et comme ils relient deux composants maintenus entre eux de manière rigide, ils peuvent être eux-mêmes rigides ce qui est favorable pour augmenter la fiabilité et réduire les coûts. Une canalisation basse pression 36, par exemple souple, relie en externe l'accumulateur basse pression 34 éloigné du bloc hydraulique 8.  The front hydraulic block 8 is directly connected by a high pressure internal pipe to the high pressure accumulator 33, in the connection 8A. At least one high pressure internal pipe directly connects the high pressure accumulator 33 to the low pressure accumulator 34, in the connection 33A. These internal ducts are very short and as they connect two components held together rigidly, they can themselves be rigid which is favorable to increase reliability and reduce costs. A low pressure line 36, for example flexible, externally connects the low pressure accumulator 34 remote from the hydraulic block 8.
On notera qu'il est préférable de disposer par rapport au bloc hydraulique avant 8, l'accumulateur basse pression 34 le plus loin et l'accumulateur haute pression 33 le plus près, pour obtenir une canalisation comportant la haute pression plus courte que celle comportant la basse pression, afin de limiter les pertes de charge générées par les débits dans ces canalisations, et de réduire la masse totale de ces accumulateurs. Ainsi dans le sous-ensemble rigide les différents carters du bloc hydraulique 8 et des accumulateurs sont reliés ensemble.  Note that it is preferable to have with respect to the front hydraulic block 8, the low-pressure accumulator 34 farthest and the high-pressure accumulator 33 nearest to obtain a pipe with a shorter high pressure than that comprising the low pressure, in order to limit the pressure losses generated by the flows in these pipes, and to reduce the total mass of these accumulators. Thus in the rigid subassembly the different housings of the hydraulic block 8 and accumulators are connected together.
Du fluide reste dans le circuit hydraulique qui est fermé entre la pompe hydraulique 4, le bloc hydraulique de commande 8, les moteurs hydrauliques 18, les accumulateurs 33, 34 et les canalisations 11, 12, 13, 14, 36. Le fluide passe de l'un à l'autre des accumulateurs 33, 34 en cas de charge ou de décharge, de manière à maintenir un minimum de pression dans ce circuit. Fluid remains in the hydraulic circuit which is closed between the hydraulic pump 4, the hydraulic control unit 8, the hydraulic motors 18, the accumulators 33, 34 and the pipes 11, 12, 13, 14, 36. The fluid passes from one to the other accumulators 33, 34 in case of charging or discharging, so as to maintain a minimum pressure in this circuit.
Le véhicule est de type appelé hybride série en comprenant une transmission hydrostatique dont les principaux composants sont notamment le moteur hydraulique 18, le bloc hydraulique 8 et les accumulateurs de pression 33, 34.  The vehicle is of the type called hybrid series comprising a hydrostatic transmission whose main components include the hydraulic motor 18, the hydraulic block 8 and the pressure accumulators 33, 34.
Les accumulateurs de pression 33, 34 constituent chacun un tube allongé de section circulaire réduite, ce qui est favorable pour limiter les contraintes dans cet accumulateur. L'accumulateur de haute pression 33 est disposé sous le plancher du véhicule, longitudinalement dans l'axe de ce véhicule. L'accumulateur basse pression 34 est fixé rigidement à l'extrémité arrière de cet accumulateur haute pression 33, en y étant disposé sensiblement transversalement.  The pressure accumulators 33, 34 each constitute an elongated tube of reduced circular section, which is favorable for limiting the stresses in this accumulator. The high pressure accumulator 33 is disposed under the floor of the vehicle, longitudinally in the axis of this vehicle. The low pressure accumulator 34 is fixed rigidly to the rear end of this high pressure accumulator 33, being disposed substantially transversely thereto.
De plus, ce sous-ensemble hydraulique présentant une forme générale en « T », comporte avantageusement une partie longitudinale disposée sous le plancher 50, dans un tunnel longitudinal 52, et une partie transversale disposée dans un creux transversal 54 disponible sous les sièges prévus pour des passagers arrière du véhicule. Ce type de tunnel est souvent prévu dans certains véhicules pour recevoir un tube d'échappement et ce type de creux transversal est souvent prévu dans certains véhicules pour recevoir un réservoir à carburant.  In addition, this hydraulic subassembly having a generally "T" shape, advantageously comprises a longitudinal portion disposed under the floor 50, in a longitudinal tunnel 52, and a transverse portion disposed in a transverse recess 54 available under the seats provided for rear passengers of the vehicle. This type of tunnel is often provided in certain vehicles to receive an exhaust tube and this type of transverse recess is often provided in certain vehicles to receive a fuel tank.
Ici, le tunnel longitudinal 52 est entre deux parties longitudinales 56 sensiblement planes du plancher 50 sous les sièges prévus pour des passagers avant du véhicule et sous les caves à pied prévues pour des passagers arrière du véhicule. A leur tronçon avant, ces parties longitudinales 56 comportent des renforts 56A entre lesquels est le bloc hydraulique 8 pour y être fixé, à distance de bras de suspension avant 58. Le tunnel longitudinal 52 est à distance de longerons longitudinaux 62 permettant la rigidité du plancher 50 qui porte le sous-ensemble hydraulique en forme générale en « T ». Pour ladite rigidité, une première traverse intermédiaire 64 de plancher est présente au niveau du raccord 33A. La structure du véhicule comporte aussi une seconde traverse intermédiaire 66 qui est raccordée à des longerons arrière 68 qui servent à la fixation du tain arrière 70 à bras arrière 72 et barre transversale 74. Des ancrages 34A du sous-ensemble hydraulique en forme générale en « T », au niveau de l'accumulateur basse pression 34, sont entre la première traverse intermédiaire 64 de plancher et la seconde traverse intermédiaire 66 de structure, à un emplacement où ces traverses rigidifient le plancher 50. Here, the longitudinal tunnel 52 is between two substantially flat longitudinal portions 56 of the floor 50 under the seats provided for the front passengers of the vehicle and under the foot cellars provided for the rear passengers of the vehicle. At their front section, these longitudinal portions 56 comprise reinforcements 56A between which is the hydraulic block 8 to be fixed at a distance from the front suspension arm 58. The longitudinal tunnel 52 is spaced from longitudinal longitudinal members 62 allowing the rigidity of the floor 50 which carries the hydraulic subassembly in general "T" shape. For said rigidity, a first intermediate floor cross 64 is present at the connection 33A. The vehicle structure also comprises a second intermediate cross member 66 which is connected to rear longitudinal members 68 which serve to fasten the rear tainter 70 to the rear arm 72 and transverse bar 74. Anchors 34A of the hydraulic subassembly in the general shape of " T ", at the level of the low-pressure accumulator 34, are between the first intermediate floor cross-member 64 and the second intermediate structural cross-member 66, at a location where these cross-members stiffen the floor 50.
Avantageusement, grâce à l'aménagement du circuit selon l'invention, les liaisons hydrauliques dans le circuit sont simplifiées et comprennent un nombre réduit de canalisations souples, ce qui permet de limiter les coûts et d'augmenter la fiabilité.  Advantageously, thanks to the development of the circuit according to the invention, the hydraulic connections in the circuit are simplified and include a reduced number of flexible pipes, which limits costs and increases reliability.
Avantageusement, le moteur thermique 2 ainsi que sa pompe hydraulique 4, constituent un sous-ensemble générateur fixé l'avant de la caisse du véhicule de manière indépendante au sous-ensemble hydraulique rigide qui est fixé sensiblement au centre du véhicule. Cette pompe 4 est reliée au bloc hydraulique avant 8 par les canalisations de haute pression 11 et de basse pression 12 qui sont souples pour permettre une certaine flexibilité d'architecture pour son implantation en liaison directe avec le moteur thermique 2.  Advantageously, the heat engine 2 and its hydraulic pump 4 constitute a generator subassembly fixed front of the vehicle body independently to the rigid hydraulic subassembly which is fixed substantially in the center of the vehicle. This pump 4 is connected to the front hydraulic block 8 by the high pressure 11 and low pressure lines 12 which are flexible to allow some flexibility of architecture for its implementation in direct connection with the engine 2.
En variante de réalisation, dans le mode de réalisation de la figure 3, un unique moteur hydraulique 18 constitue la machine de traction du véhicule, en entrée de la boîte de vitesses 31. Le nombre de tronçons de canalisation entre le bloc hydraulique 8 et la machine de traction est réduit puisqu'il n'y a qu'un moteur à alimenter. Le moteur hydraulique 18 est ici de plus forte cylindrée que chacun des moteurs correspondants du premier mode de réalisation de l'invention décrit en relation avec la figure 1. In an alternative embodiment, in the embodiment of FIG. 3, a single hydraulic motor 18 constitutes the vehicle traction machine, at the input of the gearbox 31. The number of pipe sections between the hydraulic block 8 and the traction machine is reduced since there is only one motor to feed. The hydraulic motor 18 is here of greater displacement than each of the corresponding engines of the first embodiment of the invention described with reference to FIG.
En variante, la puissance mécanique d'entraînement de la pompe hydraulique 4 pour générer la pression hydraulique, peut être délivrée par un moteur électrique à la place du moteur thermique. Dans le cadre de l'invention, le moteur thermique ou électrique peut être monté dans le véhicule à différents emplacements, notamment dans les positions suivantes, porte à faux avant, centrale avant, centrale arrière, ou porte à faux arrière .  As a variant, the mechanical driving power of the hydraulic pump 4 for generating the hydraulic pressure can be delivered by an electric motor in place of the heat engine. In the context of the invention, the engine or electric motor can be mounted in the vehicle at different locations, including the following positions, front overhang, front center, rear center, or rear overhang.

Claims

R E V E N D I C A T I O N S
1. Système de motorisation hydraulique pour véhicule automobile, comprenant un moteur de production d'énergie mécanique (2), une pompe hydraulique (4) entraînée par ce moteur pour recharger des accumulateurs de pression (33, 34), et au moins une machine hydraulique de traction (18) qui est adaptée à entraîner des roues motrices (30) du véhicule et qui est commandée par un bloc hydraulique (8) relié à ces accumulateurs de pression, caractérisé en ce que d'une part les accumulateurs de pression (33, 34) et le bloc hydraulique (8) sont reliés directement entre eux en formant un sous- ensemble hydraulique rigide et d'autre part la machine hydraulique de traction (18) est dissociée dudit sous- ensemble hydraulique rigide en étant reliée directement avec un différentiel pour former un sous-ensemble rigide de traction. 1. Hydraulic motorization system for a motor vehicle, comprising a motor for producing mechanical energy (2), a hydraulic pump (4) driven by this motor for recharging pressure accumulators (33, 34), and at least one machine hydraulic traction unit (18) which is adapted to drive the driving wheels (30) of the vehicle and which is controlled by a hydraulic block (8) connected to these pressure accumulators, characterized in that on the one hand the pressure accumulators ( 33, 34) and the hydraulic block (8) are connected directly to each other forming a rigid hydraulic subassembly and on the other hand the hydraulic traction machine (18) is dissociated from said rigid hydraulic subassembly while being connected directly with a differential to form a rigid traction subassembly.
2. Système selon la revendication précédente, caractérisé en ce que le sous-ensemble rigide de traction comporte une boîte de vitesses interposée entre la machine hydraulique de traction (18) et le différentiel.  2. System according to the preceding claim, characterized in that the rigid traction subassembly comprises a gearbox interposed between the hydraulic traction machine (18) and the differential.
3. Système selon l'une quelconque des revendications précédentes, caractérisé en ce que la machine hydraulique de traction comprend deux moteurs hydrauliques .  3. System according to any one of the preceding claims, characterized in that the hydraulic traction machine comprises two hydraulic motors.
4. Système selon l'une quelconque des revendications précédentes, caractérisé en ce que les accumulateurs de pression comportent une forme tubulaire allongée, l'un (33) des accumulateurs étant prévu pour être disposé longitudinalement suivant l'axe du véhicule, sous le plancher de ce véhicule, l'autre (34) des accumulateurs étant fixé transversalement sur l'accumulateur longitudinal.  4. System according to any one of the preceding claims, characterized in that the pressure accumulators comprise an elongate tubular shape, one (33) accumulators being provided to be arranged longitudinally along the axis of the vehicle, under the floor of this vehicle, the other (34) accumulators being fixed transversely on the longitudinal accumulator.
5. Système selon la revendication 4, caractérisé en ce que l'accumulateur longitudinal est un accumulateur haute pression (33), et l'accumulateur disposé transversalement est un accumulateur basse pression (34). 5. System according to claim 4, characterized in that the longitudinal accumulator is an accumulator high pressure (33), and the transversely arranged accumulator is a low pressure accumulator (34).
6. Système selon l'une quelconque des revendications précédentes, caractérisé en ce que le moteur entraînant la pompe hydraulique (4) est un moteur thermique ( 2 ) .  6. System according to any one of the preceding claims, characterized in that the motor driving the hydraulic pump (4) is a heat engine (2).
7. Véhicule automobile comportant un système de motorisation hydraulique comprenant un moteur de production d'énergie mécanique (2), une pompe hydraulique (4) entraînée par ce moteur pour recharger des accumulateurs de pression (33, 34), et au moins une machine hydraulique de traction (18) reliée à entraînement avec les roues motrices (30) du véhicule et qui est commandée par un bloc hydraulique (8) relié à ces accumulateurs de pression, caractérisé en ce que le système de motorisation hydraulique est conforme à l'une quelconque des revendications précédentes pour que la machine hydraulique puisse mouvoir le véhicule en entraînant les roues motrices.  7. Motor vehicle comprising a hydraulic motorization system comprising a mechanical energy production engine (2), a hydraulic pump (4) driven by this engine to recharge pressure accumulators (33, 34), and at least one machine hydraulic traction unit (18) drivingly connected to the drive wheels (30) of the vehicle and controlled by a hydraulic block (8) connected to these pressure accumulators, characterized in that the hydraulic drive system is in accordance with the any of the preceding claims for the hydraulic machine to move the vehicle by driving the drive wheels.
8. Véhicule selon la revendication précédente, caractérisé en ce que son système de motorisation hydraulique est conforme à la revendication 4 en ayant l'un (33) de ses accumulateurs disposé longitudinalement suivant l'axe du véhicule, sous le plancher de ce véhicule dans un tunnel central, l'autre (34) de ses accumulateurs étant fixé transversalement sur l'accumulateur longitudinal.  8. Vehicle according to the preceding claim, characterized in that its hydraulic drive system is according to claim 4 having one (33) of its accumulators arranged longitudinally along the axis of the vehicle, under the floor of this vehicle in a central tunnel, the other (34) of its accumulators being fixed transversely on the longitudinal accumulator.
9. Véhicule selon la revendication précédente, caractérisé en ce que son accumulateur (34) disposé transversalement est situé sous des sièges prévus pour des passagers arrière du véhicule.  9. Vehicle according to the preceding claim, characterized in that its accumulator (34) disposed transversely is located under seats provided for rear passengers of the vehicle.
10. Véhicule selon la revendication précédente, dont la machine hydraulique de traction (18) est reliée aux roues motrices (30) du véhicule qui sont à son train avant, caractérisé en ce que son système de motorisation hydraulique est conforme à la revendication 5 en ayant son accumulateur longitudinal qui est un accumulateur haute pression (33) dont l'extrémité avant est orientée vers les roues motrices et son accumulateur disposé transversalement qui est un accumulateur basse pression (34), à l'extrémité arrière de l'accumulateur longitudinal haute pression (33) . 10. Vehicle according to the preceding claim, the hydraulic traction machine (18) is connected to the drive wheels (30) of the vehicle which are at its front axle, characterized in that its hydraulic drive system is in accordance with claim 5 in having its longitudinal accumulator which is an accumulator high pressure (33) whose front end is oriented towards the drive wheels and its transversely arranged accumulator which is a low pressure accumulator (34), at the rear end of the high pressure longitudinal accumulator (33).
PCT/FR2012/050622 2011-04-14 2012-03-26 Hydraulic drive system for a motor vehicle WO2012168596A1 (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2645932A1 (en) * 1989-04-14 1990-10-19 Man Nutzfahrzeuge Ag HYDROSTATIC-MECHANICAL TRANSMISSION WITH PROGRESSIVE ACTION WITH POWER DERIVATION
DE4212542A1 (en) * 1992-04-15 1993-10-21 Kurt Huber Braking energy recycling system for wheeled vehicle, train, electric motor - has motor-pump unit to accept pressurised oil from reservoir during acceleration and deliver it during braking
WO2001051870A1 (en) * 2000-01-10 2001-07-19 United States Environmental Protection Agency Hydraulic hybrid vehicle
WO2002043980A2 (en) * 2000-11-28 2002-06-06 Shep Limited Hydraulic energy storage systems
EP1457377A1 (en) * 2003-03-12 2004-09-15 Sista Evoluzione Srl An engine/pump of a pneumatic type for motor vehicles, a propulsion system including this engine, and a motor vehicle using this system
WO2005075233A2 (en) * 2004-01-30 2005-08-18 Government Of The United States Of America, As Represented By The Administrator Of The U.S. Environmental Protection Agency Hydraulic hybrid vehicle with integrated hydraulic drive module and four-wheel-drive, and method of operation thereof
EP1628028A2 (en) * 2004-08-16 2006-02-22 Eaton Corporation Hydraulic drive system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2645932A1 (en) * 1989-04-14 1990-10-19 Man Nutzfahrzeuge Ag HYDROSTATIC-MECHANICAL TRANSMISSION WITH PROGRESSIVE ACTION WITH POWER DERIVATION
DE4212542A1 (en) * 1992-04-15 1993-10-21 Kurt Huber Braking energy recycling system for wheeled vehicle, train, electric motor - has motor-pump unit to accept pressurised oil from reservoir during acceleration and deliver it during braking
WO2001051870A1 (en) * 2000-01-10 2001-07-19 United States Environmental Protection Agency Hydraulic hybrid vehicle
WO2002043980A2 (en) * 2000-11-28 2002-06-06 Shep Limited Hydraulic energy storage systems
EP1457377A1 (en) * 2003-03-12 2004-09-15 Sista Evoluzione Srl An engine/pump of a pneumatic type for motor vehicles, a propulsion system including this engine, and a motor vehicle using this system
WO2005075233A2 (en) * 2004-01-30 2005-08-18 Government Of The United States Of America, As Represented By The Administrator Of The U.S. Environmental Protection Agency Hydraulic hybrid vehicle with integrated hydraulic drive module and four-wheel-drive, and method of operation thereof
EP1628028A2 (en) * 2004-08-16 2006-02-22 Eaton Corporation Hydraulic drive system

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