EP3008340A1 - Hydraulic machine comprising cylinders provided with angularly offset openings - Google Patents

Hydraulic machine comprising cylinders provided with angularly offset openings

Info

Publication number
EP3008340A1
EP3008340A1 EP14731746.5A EP14731746A EP3008340A1 EP 3008340 A1 EP3008340 A1 EP 3008340A1 EP 14731746 A EP14731746 A EP 14731746A EP 3008340 A1 EP3008340 A1 EP 3008340A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic machine
pistons
cylinder
openings
offset
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP14731746.5A
Other languages
German (de)
French (fr)
Other versions
EP3008340B1 (en
Inventor
Olivier BALENGHIEN
Ante Bozic
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Technoboost SAS
Original Assignee
Technoboost SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Technoboost SAS filed Critical Technoboost SAS
Publication of EP3008340A1 publication Critical patent/EP3008340A1/en
Application granted granted Critical
Publication of EP3008340B1 publication Critical patent/EP3008340B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B3/00—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F01B3/0032—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F01B3/0044—Component parts, details, e.g. valves, sealings, lubrication
    • F01B3/007—Swash plate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
    • F03C1/0636—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
    • F03C1/0636—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F03C1/0644—Component parts
    • F03C1/0655—Valve means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F04B1/2014—Details or component parts
    • F04B1/2042—Valves

Definitions

  • the present invention relates to a hydraulic machine comprising several pistons sliding in cylinders, a method of calculating the manifold openings of this machine, and a hybrid vehicle equipped with such a hydraulic machine.
  • a type of hydraulic barrel machine known, presented in particular by the document US-A-5358388, comprises a motorized input shaft which drives in rotation a barrel having a succession of several parallel cylinders regularly distributed around the axis of this tree.
  • Each cylinder receives a piston bearing axially on a side conventionally called front side, on a tilting plate which is fixed in rotation, by means of a bearing forming an axial stop.
  • a turn of rotation of the barrel gives each piston a movement in a complete cycle comprising a stroke depending on the angle of inclination of the plate, which is adjustable by a tilt control. It can thus go of zero displacement with the tilting plate perpendicular to the shaft, at a maximum displacement with the highest inclination of this plate.
  • the rear face of the barrel, opposite the tilting plate, is supported on a fixed circular plate which closes the ends of the cylinders, to ensure a seal.
  • the plate comprises a low pressure collector and a high pressure collector each forming an arc of a circle facing a series of cylinders, these collectors being separated by a sufficient space so that each cylinder closes on one of the collectors before s open on the other.
  • each opening of a cylinder on one of the collectors generates a pressure shock in the cylinder which is reflected by the piston on the tilting plate, producing vibrations of the machine causing noise emissions.
  • the present invention is intended to avoid these disadvantages of the prior art.
  • a hydraulic machine comprising a barrel rotated by an input shaft, comprising cylinders distributed around the axis, each receiving a sliding piston according to the rotation of the shaft, each cylinder opening through an opening on a transverse face of the cylinder bearing on a circular plate having inlet and outlet manifolds, the openings having with respect to their cylinders, angular offsets included within a total offset range, characterized in that the offsets of the openings are arranged at either end of this offset range.
  • An advantage of this hydraulic machine is that one obtains in a simple manner for a total range of angular offset chosen, when the offset changes side, a maximum shift from one opening to the other equivalent to the total range. Measurements and tests have shown that this type of the largest shift possible, arranged irregularly over a complete cycle of the hydraulic machine, gives the best results with regard to the reduction of the sound level as well as the signature of the noise which gets closer to that of a heat engine.
  • the hydraulic machine according to the invention may further comprise one or more of the following features, which may be combined with one another.
  • the total offset range of the openings is between 2 and 4 °.
  • the offset range for each cylinder may be centered on the axis of the corresponding cylinder.
  • the hydraulic machine comprises a plurality of pistons, for example 7 or 9, comprising opening offsets on one side or the other of the offset range, which follow the next sequence for offset "0" on one side and "1" on the other side: 1; 0; 0; 1; 0; 1; 1; 1; 0.
  • the invention also relates to a method of calculating an aperture offset sequence for a hydraulic machine comprising any of the preceding features, which uses a scrambler type scrambling method.
  • the calculation method applies an additive calculation method, transforming the original data sequence into a sequence that applies a pseudo-random binary order of the "PRBS" type, by adding modules two by two.
  • the invention furthermore relates to a hybrid motor vehicle having at least one hydraulic machine used for traction, comprising any one of the preceding features.
  • FIG. 1 is an axial sectional view of a hydraulic machine with axial pistons
  • FIG. 2 is a view of the rear face of a barrel for this type of machine, comprising openings without angular displacement;
  • FIG. 3 is a view of the rear face of a barrel for this type of machine, comprising openings with angular offsets according to the invention.
  • FIGS. 4 to 6 show successively for a machine comprising openings without angular displacement, openings with an angular offset calculated according to a first method, and with an angular offset calculated according to a second method, at the top the level of excitation according to the time of the high and low pressure circuits, and in the middle and bottom depending on the frequency, respectively the excitation level for the high pressure circuit, and for the low pressure circuit.
  • Figure 1 shows a hydraulic machine 1 rotatable in both directions of rotation, comprising a generally cylindrical body 2 closed on the rear side by a cover 4.
  • the body 2 and the cover 4 each support a tapered roller bearing 8, which guides an input shaft 6 disposed along the axis of this body.
  • a barrel 12 rotatably connected to the input shaft 6, comprises nine cylinders 14 arranged parallel to the axis, which are regularly distributed around this axis.
  • Each cylinder 14 contains a piston 16 whose front end presented by the arrow "AV" is supported by an axial stop 18 on a tilting plate 20 which can pivot about an axis perpendicular to the input shaft 6, under the effect of a hydraulic control cylinder 22 and a return spring 26.
  • the rear face of the barrel 12 is supported on a transverse circular plate 24 held by the cover 4, to close the rear opening of the cylinders 14.
  • the plate 24 comprises a low pressure manifold and a high pressure manifold each forming a circular arc covering just under half of the positions of the cylinders 14.
  • FIG. 2 shows the rear face of a barrel 12 comprising nine cylinders 14 each presented by a dashed circle, which are arranged with an angular spacing regularly distributed around the main axis of the machine.
  • Each cylinder 14 has an opening 30 opening on the rear face of the barrel 12, which is perfectly aligned with its cylinder.
  • FIG. 4 to 6 shows, on the first graph as a function of time, the pressure curves of the high-pressure 40 and low-pressure circuits 42, comprising a periodic curve comprising a main oscillation frequency corresponding to the first frequency of the machine, as well as harmonics that are superimposed on this main frequency.
  • the second graph of these figures shows for the high pressure circuit and the third graph present for the low pressure circuit, the excitation level 44, 46 as a function of the frequency.
  • excitation lines 44 and 46 are clearly distinguished, which are distributed over the entire width of the sound spectrum. This results in a pronounced siren sound, which is distinctly different from that emitted by a heat engine.
  • FIG. 3 shows the rear face of a cylinder 12 comprising openings 30 which are all angularly offset with respect to their cylinders 14, with an arrangement which is each time at one end of a total angular range of offset. There are therefore two groups of openings 30 identical to each other, comprising an angular offset on one side or the other of their cylinders 14.
  • each opening 30 is denoted by the number "1" when it is a negative offset in the direction of rotation of the cylinder 12 indicated by the arrow, and "0" when it is an offset positive.
  • the maximum allowable offsets in each direction are taken for the pistons when approaching neutral or low, without the risk of cavitation problems caused by too strong depressions, to determine the total offset range.
  • the total width of this range is then used to create the maximum angular offsets from one opening to the next. Note that a larger offset range gives better results for attenuation of siren sounds.
  • the offset range advantageously between 2 and 4 °, can be centered or offset on the axis of the cylinder 14.
  • the following offsets can be obtained: -1 ° / + 1 ° or - 0.5 ° / + 1 .5 °, and for a total range of 4 ° the following decetages: -1 ° / + 3 ° or - 2 ° / + 2 °.
  • the scrambler method of scrambling has been identified as providing the best results for eliminating siren noise with its harmonics, and approaching the sound signature emitted by a heat engine.
  • the Scrambler method is used to eliminate the dependence of the acoustic power spectrum on the actual starting signal, which emits the siren sound of the hydraulic machine, making it more dispersed to spread the acoustic energy of the frequency peaks to a maximum. wider frequency band. This process reduces the energy level of emerging frequencies giving the siren sound.
  • a first method including an additive calculation method, transforms the original data sequence into a pseudo-random sequence, which applies a pseudo-random binary order called "PRBS" for "Pseudo Random Binary Sequence", by the addition of modules two by two.
  • Another method of Scrambler comprising a multiplicative calculation method, executes a multiplication of the input signal by a Scrambler transfer function, to give discrete linear systems.
  • Figure 5 shows the analysis results for a hydraulic machine using the Scrambler method without pseudo-random binary order "PRBS", including the multiplicative process
  • Figure 6 show the same results for a hydraulic machine using the Scrambler method with the pseudo-random binary order "PRBS" comprising the additive method.
  • the "PRBS" method gives a bit sequence comprising a sequence of bits 0 or 1 having a pseudo-random character, the value of each of the elements is independent of that of the others. However this sequence is renewed at each cycle of rotation of the machine, so it is a periodic sequence, which makes it deterministic.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Reciprocating Pumps (AREA)
  • Hydraulic Motors (AREA)

Abstract

A hydraulic machine comprising a drum (12) rotated by an input shaft, comprising cylinders (14) distributed around the shaft, each receiving a piston that slides on the basis of the rotation of the shaft, each cylinder opening at an opening (30) on a transverse face of the drum bearing on a plate having inlet and outlet manifolds, the openings (30) comprising, relative to the cylinders (14) of same, angular offsets comprised within a total offset range, characterised in that the offsets of the openings (30) are disposed at one end or the other of this offset range.

Description

MACHINE HYDRAULIQUE COMPORTANT DES CYLINDRES DISPOSANT D'OUVERTURES DECALEES ANGULAIREMENT  HYDRAULIC MACHINE COMPRISING CYLINDERS HAVING ANGULARLY OFFSET OPENINGS
La présente invention concerne une machine hydraulique comportant plusieurs pistons coulissant dans des cylindres, un procédé de calcul des ouvertures du collecteur de cette machine, ainsi qu'un véhicule hybride équipé d'une telle machine hydraulique. The present invention relates to a hydraulic machine comprising several pistons sliding in cylinders, a method of calculating the manifold openings of this machine, and a hybrid vehicle equipped with such a hydraulic machine.
Un type de machine hydraulique à barillet connu, présenté notamment par le document US-A-5358388, comporte un arbre d'entrée motorisé qui entraîne en rotation un barillet disposant d'une succession de plusieurs cylindres parallèles régulièrement répartis autour de l'axe de cet arbre. Chaque cylindre reçoit un piston prenant appui axialement d'un côté appelé par convention côté avant, sur un plateau inclinable qui est fixe en rotation, par l'intermédiaire d'un roulement formant une butée axiale.  A type of hydraulic barrel machine known, presented in particular by the document US-A-5358388, comprises a motorized input shaft which drives in rotation a barrel having a succession of several parallel cylinders regularly distributed around the axis of this tree. Each cylinder receives a piston bearing axially on a side conventionally called front side, on a tilting plate which is fixed in rotation, by means of a bearing forming an axial stop.
Un tour de rotation du barillet donne à chaque piston un mouvement suivant un cycle complet comprenant une course dépendant de l'angle d'inclinaison du plateau, qui est réglable par une commande d'inclinaison. On peut aller ainsi d'une cylindrée nulle avec le plateau inclinable perpendiculaire à l'arbre, à une cylindrée maximale avec la plus forte inclinaison de ce plateau.  A turn of rotation of the barrel gives each piston a movement in a complete cycle comprising a stroke depending on the angle of inclination of the plate, which is adjustable by a tilt control. It can thus go of zero displacement with the tilting plate perpendicular to the shaft, at a maximum displacement with the highest inclination of this plate.
La face arrière du barillet, opposée au plateau inclinable, est en appui sur une platine circulaire fixe qui ferme l'extrémité des cylindres, afin d'assurer une étanchéité. La platine comporte un collecteur basse pression et un collecteur haute pression formant chacun un arc de cercle se trouvant en face d'une série de cylindres, ces collecteurs étant séparés par un espace suffisant afin que chaque cylindre se ferme sur un des collecteurs avant de s'ouvrir sur l'autre.  The rear face of the barrel, opposite the tilting plate, is supported on a fixed circular plate which closes the ends of the cylinders, to ensure a seal. The plate comprises a low pressure collector and a high pressure collector each forming an arc of a circle facing a series of cylinders, these collectors being separated by a sufficient space so that each cylinder closes on one of the collectors before s open on the other.
Avec ces machines à pistons, chaque ouverture d'un cylindre sur un des collecteurs génère un choc de pression dans le cylindre qui se répercute par le piston sur le plateau inclinable, en produisant des vibrations de la machine causant des émissions sonores. On a alors des émissions sonores avec une fréquence principale correspondant au nombre de cylindres multiplié par la vitesse de rotation de la machine, ainsi que des fréquences harmoniques multiples de cette fréquence principale, qui génèrent un bruit similaire à celui d'une sirène. With these piston machines, each opening of a cylinder on one of the collectors generates a pressure shock in the cylinder which is reflected by the piston on the tilting plate, producing vibrations of the machine causing noise emissions. We then have sound emissions with a main frequency corresponding to the number of cylinders multiplied by the speed of rotation of the machine, as well as multiple harmonic frequencies of this main frequency, which generate a noise similar to that of a siren.
Pour limiter les émissions sonores certaines ouvertures des extrémités de cylindre en appui sur la platine, comportent par rapport à leurs cylindres, un petit décalage angulaire tangent au sens de rotation, qui est limité à quelques degrés. En particulier certaines ouvertures sont alignées sur le cylindre, sans décalage, d'autres sont suivant le sens de rotation du barillet, un peu en avance ou en retard par rapport à leurs cylindres, et d'autres plus en avance ou plus en retard par rapport à leurs cylindres.  To limit noise emissions certain openings of the cylinder ends in support on the plate, have with respect to their cylinders, a small angular offset tangent to the direction of rotation, which is limited to a few degrees. In particular, some openings are aligned on the cylinder, without any offset, others are in the direction of rotation of the cylinder, a little in advance or late with respect to their cylinders, and others more in advance or more late by compared to their cylinders.
On a ainsi à l'intérieur d'une plage totale de réglage du décalage centrée sur l'axe du cylindre, différents degrés de décalage comprenant un décalage nul, des décalages faibles d'un côté ou de l'autre, et des décalages importants d'un côté ou de l'autre.  There is thus within a total offset adjustment range centered on the cylinder axis, different degrees of offset including zero offset, small offsets on one side or the other, and significant offsets. on one side or the other.
Le document d'art antérieur cité ci-dessus permet pour ce type de machine, une réduction de certaines fréquences propres d'émission sonore, due à une relative irrégularité des périodes successives entre les ouvertures ou les fermetures de chaque cylindre vers les collecteurs.  The prior art document cited above allows for this type of machine, a reduction of certain natural frequencies of sound emission, due to a relative irregularity of successive periods between the openings or closures of each cylinder to the collectors.
Toutefois des essais montrent que la réduction des émissions sonores n'est pas suffisante, en particulier pour des applications dans un véhicule hybride comprenant des pompes et des machines hydrauliques tournant à des vitesses relativement élevées, qui permette de stocker une énergie hydraulique dans des accumulateurs de pression, et de la restituer par la suite pour économiser l'énergie.  However, tests show that the reduction of noise emissions is not sufficient, in particular for applications in a hybrid vehicle comprising pumps and hydraulic machines rotating at relatively high speeds, which makes it possible to store hydraulic energy in storage accumulators. pressure, and then restore it to save energy.
De plus dans ces véhicules la signature du bruit émis par ce type de machine donnant l'effet d'une sirène, est très différente de celle émise par le moteur thermique. Ces bruits sont désagréables, et le conducteur ainsi que l'entourage peuvent être perturbés, notamment dans le cas d'un roulage en mode hybride qui peut passer alternativement et de manière automatique, d'une traction avec le moteur thermique à une traction avec la machine hydraulique. Moreover, in these vehicles the signature of the noise emitted by this type of machine giving the effect of a siren is very different from that emitted by the heat engine. These noises are unpleasant, and the driver and the entourage can be disturbed, especially in the case of a hybrid mode taxi that can pass alternately and automatically, from a traction with the engine to a traction with the hydraulic machine.
La présente invention a notamment pour but d'éviter ces inconvénients de la technique antérieure.  The present invention is intended to avoid these disadvantages of the prior art.
Elle propose à cet effet une machine hydraulique comportant un barillet entraîné en rotation par un arbre d'entrée, comprenant des cylindres répartis autour de l'axe, recevant chacun un piston coulissant en fonction de la rotation de l'arbre, chaque cylindre débouchant par une ouverture sur une face transversale du barillet en appui sur une platine circulaire disposant de collecteurs d'entrée et de sortie, les ouvertures comportant par rapport à leurs cylindres, des décalages angulaires compris à l'intérieur d'une plage totale de décalage, caractérisée en ce que les décalages des ouvertures sont disposés à l'une ou à l'autre extrémité de cette plage de décalage.  It proposes for this purpose a hydraulic machine comprising a barrel rotated by an input shaft, comprising cylinders distributed around the axis, each receiving a sliding piston according to the rotation of the shaft, each cylinder opening through an opening on a transverse face of the cylinder bearing on a circular plate having inlet and outlet manifolds, the openings having with respect to their cylinders, angular offsets included within a total offset range, characterized in that the offsets of the openings are arranged at either end of this offset range.
Un avantage de cette machine hydraulique est que l'on obtient de manière simple pour une plage totale de décalage angulaire choisie, quand le décalage change de côté, un décalage maximum d'une ouverture à l'autre équivalant à la plage totale. Des mesures et des essais ont montré que ce type de décalage le plus important possible, disposé de manière irrégulière sur un cycle complet de la machine hydraulique, donne les meilleurs résultats en ce qui concerne la diminution du niveau sonore ainsi que la signature du bruit qui se rapproche de celle d'un moteur thermique.  An advantage of this hydraulic machine is that one obtains in a simple manner for a total range of angular offset chosen, when the offset changes side, a maximum shift from one opening to the other equivalent to the total range. Measurements and tests have shown that this type of the largest shift possible, arranged irregularly over a complete cycle of the hydraulic machine, gives the best results with regard to the reduction of the sound level as well as the signature of the noise which gets closer to that of a heat engine.
La machine hydraulique selon l'invention peut de plus comporter une ou plusieurs des caractéristiques suivantes, qui peuvent être combinées entre elles.  The hydraulic machine according to the invention may further comprise one or more of the following features, which may be combined with one another.
Avantageusement, la plage totale de décalage des ouvertures est comprise entre 2 et 4° .  Advantageously, the total offset range of the openings is between 2 and 4 °.
En particulier, la plage de décalage pour chaque cylindre peut être centrée sur l'axe du cylindre correspondant.  In particular, the offset range for each cylinder may be centered on the axis of the corresponding cylinder.
Selon un mode de réalisation, la machine hydraulique comporte plusieurs pistons, par exemple 7 ou 9, comprenant des décalages d'ouverture d'un côté ou de l'autre de la plage de décalage, qui suivent la séquence suivante pour un décalage noté « 0 » d'un côté et « 1 » de l'autre : 1 ; 0 ; 0 ; 1 ; 0 ; 1 ; 1 ; 1 ; 0. According to one embodiment, the hydraulic machine comprises a plurality of pistons, for example 7 or 9, comprising opening offsets on one side or the other of the offset range, which follow the next sequence for offset "0" on one side and "1" on the other side: 1; 0; 0; 1; 0; 1; 1; 1; 0.
L'invention a aussi pour objet une méthode de calcul d'une séquence de décalage des ouvertures pour une machine hydraulique comprenant l'une quelconque des caractéristiques précédentes, qui utilise une méthode de brouillage de séquence du type « Scrambler ».  The invention also relates to a method of calculating an aperture offset sequence for a hydraulic machine comprising any of the preceding features, which uses a scrambler type scrambling method.
Avantageusement, la méthode de calcul applique un procédé de calcul additif, transformant la séquence de données d'origine en une séquence qui applique un ordre binaire pseudo-aléatoire du type « PRBS », par l'addition de modules deux à deux.  Advantageously, the calculation method applies an additive calculation method, transforming the original data sequence into a sequence that applies a pseudo-random binary order of the "PRBS" type, by adding modules two by two.
L'invention a de plus pour objet un véhicule automobile hybride disposant d'au moins une machine hydraulique utilisée pour la traction, comprenant l'une quelconque des caractéristiques précédentes.  The invention furthermore relates to a hybrid motor vehicle having at least one hydraulic machine used for traction, comprising any one of the preceding features.
L'invention sera mieux comprise et d'autres caractéristiques et avantages apparaîtront plus clairement à la lecture de la description ci-après donnée à titre d'exemple et de manière non limitative, en référence aux dessins annexés dans lesquels :  The invention will be better understood and other features and advantages will appear more clearly on reading the following description given by way of example and in a nonlimiting manner, with reference to the appended drawings in which:
- la figure 1 est une vue en coupe axiale d'une machine hydraulique à pistons axiaux ;  - Figure 1 is an axial sectional view of a hydraulic machine with axial pistons;
- la figure 2 est une vue de la face arrière d'un barillet pour ce type de machine, comprenant des ouvertures sans décalage angulaire ;  FIG. 2 is a view of the rear face of a barrel for this type of machine, comprising openings without angular displacement;
- la figure 3 est une vue de la face arrière d'un barillet pour ce type de machine, comprenant des ouvertures avec des décalages angulaires selon l'invention ; et  FIG. 3 is a view of the rear face of a barrel for this type of machine, comprising openings with angular offsets according to the invention; and
- les figures 4 à 6 présentent successivement pour une machine comprenant des ouvertures sans décalage angulaire, des ouvertures avec un décalage angulaire calculé selon une première méthode, et avec un décalage angulaire calculé selon une deuxième méthode, en haut le niveau d'excitation en fonction du temps des circuits haute et basse pression, et au milieu et en bas en fonction de la fréquence, respectivement le niveau d'excitation pour le circuit haute pression, et pour le circuit basse pression. La figure 1 présente une machine hydraulique 1 pouvant tourner dans les deux sens de rotation, comprenant un corps globalement cylindrique 2 fermé du côté arrière par un couvercle 4. Le corps 2 et le couvercle 4 supportent chacun un roulement à rouleaux coniques 8, qui guide un arbre d'entrée 6 disposé suivant l'axe de ce corps. FIGS. 4 to 6 show successively for a machine comprising openings without angular displacement, openings with an angular offset calculated according to a first method, and with an angular offset calculated according to a second method, at the top the level of excitation according to the time of the high and low pressure circuits, and in the middle and bottom depending on the frequency, respectively the excitation level for the high pressure circuit, and for the low pressure circuit. Figure 1 shows a hydraulic machine 1 rotatable in both directions of rotation, comprising a generally cylindrical body 2 closed on the rear side by a cover 4. The body 2 and the cover 4 each support a tapered roller bearing 8, which guides an input shaft 6 disposed along the axis of this body.
Un barillet 12 lié en rotation à l'arbre d'entrée 6, comporte neuf cylindres 14 disposés parallèlement à l'axe, qui sont régulièrement répartis autour de cet axe.  A barrel 12 rotatably connected to the input shaft 6, comprises nine cylinders 14 arranged parallel to the axis, which are regularly distributed around this axis.
Chaque cylindre 14 contient un piston 16 dont l'extrémité avant présenté par la flèche « AV », prend appui par une butée axiale 18 sur un plateau inclinable 20 qui peut pivoter autour d'un axe perpendiculaire à l'arbre d'entrée 6, sous l'effet d'un vérin hydraulique de commande 22 et d'un ressort de rappel 26.  Each cylinder 14 contains a piston 16 whose front end presented by the arrow "AV" is supported by an axial stop 18 on a tilting plate 20 which can pivot about an axis perpendicular to the input shaft 6, under the effect of a hydraulic control cylinder 22 and a return spring 26.
La face arrière du barillet 12 prend appui sur une platine circulaire transversale 24 maintenue par le couvercle 4, pour fermer l'ouverture arrière des cylindres 14. La platine 24 comporte un collecteur basse pression et un collecteur haute pression formant chacun un arc de cercle couvrant un peu moins de la moitié des positions des cylindres 14.  The rear face of the barrel 12 is supported on a transverse circular plate 24 held by the cover 4, to close the rear opening of the cylinders 14. The plate 24 comprises a low pressure manifold and a high pressure manifold each forming a circular arc covering just under half of the positions of the cylinders 14.
La figure 2 présente la face arrière d'un barillet 12 comprenant neuf cylindres 14 présentés chacun par un cercle en pointillé, qui sont disposés avec un espacement angulaire régulièrement réparti autour de l'axe principal de la machine. Chaque cylindre 14 comporte une ouverture 30 débouchant sur cette face arrière du barillet 12, qui est parfaitement alignée sur son cylindre.  Figure 2 shows the rear face of a barrel 12 comprising nine cylinders 14 each presented by a dashed circle, which are arranged with an angular spacing regularly distributed around the main axis of the machine. Each cylinder 14 has an opening 30 opening on the rear face of the barrel 12, which is perfectly aligned with its cylinder.
On obtient ainsi lors de la rotation du barillet 12, une période entre chaque communication d'un cylindre 14 avec un collecteur par son ouverture 30, qui est constante.  Thus, during the rotation of the barrel 12, a period between each communication of a cylinder 14 with a manifold by its opening 30, which is constant.
Chaque figure 4 à 6 présente sur le premier graphique en fonction du temps, les courbes de pression des circuits haute pression 40 et basse pression 42, comprenant une courbe périodique comportant une fréquence d'oscillation principale correspondant à la fréquence première de la machine, ainsi que des harmoniques qui se superposent sur cette fréquence principale. Each FIG. 4 to 6 shows, on the first graph as a function of time, the pressure curves of the high-pressure 40 and low-pressure circuits 42, comprising a periodic curve comprising a main oscillation frequency corresponding to the first frequency of the machine, as well as harmonics that are superimposed on this main frequency.
Le deuxième graphique de ces figures présente pour le circuit haute pression et le troisième graphique présente pour le circuit basse pression, le niveau d'excitation 44, 46 en fonction de la fréquence.  The second graph of these figures shows for the high pressure circuit and the third graph present for the low pressure circuit, the excitation level 44, 46 as a function of the frequency.
Pour la figure 4, on constate que pour chacun des circuits on obtient des raies d'excitation 44, 46 se distinguant nettement, qui sont réparties sur toute la largeur du spectre sonore. Il en résulte un bruit de sirène prononcé, qui est nettement différent de celui émis par un moteur thermique.  For FIG. 4, it can be seen that, for each of the circuits, excitation lines 44 and 46 are clearly distinguished, which are distributed over the entire width of the sound spectrum. This results in a pronounced siren sound, which is distinctly different from that emitted by a heat engine.
La figure 3 présente la face arrière d'un barillet 12 comprenant des ouvertures 30 qui sont toutes décalées angulairement par rapport à leurs cylindres 14, avec une disposition qui est à chaque fois à une extrémité d'une plage angulaire totale de décalage. On a donc deux groupes d'ouvertures 30 identiques entre elles, comprenant un décalage angulaire d'un côté ou de l'autre de leurs cylindres 14.  FIG. 3 shows the rear face of a cylinder 12 comprising openings 30 which are all angularly offset with respect to their cylinders 14, with an arrangement which is each time at one end of a total angular range of offset. There are therefore two groups of openings 30 identical to each other, comprising an angular offset on one side or the other of their cylinders 14.
Le décalage de chaque ouverture 30 est noté par le chiffre « 1 » quand il s'agit d'un décalage négatif dans le sens de rotation du barillet 12 indiqué par la flèche, et « 0 » quand il s'agit d'un décalage positif. On obtient en partant d'une position de départ D, la séquence suivante pour le décalage des ouvertures 30 de cette machine hydraulique comprenant neuf cylindres :  The offset of each opening 30 is denoted by the number "1" when it is a negative offset in the direction of rotation of the cylinder 12 indicated by the arrow, and "0" when it is an offset positive. Starting from a starting position D, the following sequence is obtained for shifting the openings 30 of this hydraulic machine comprising nine cylinders:
1 ; 0 ; 0 ; 1 ; 0 ; 1 ; 1 ; 1 ; 0.  1; 0; 0; 1; 0; 1; 1; 1; 0.
Ces décalages angulaires donnent des variations irrégulières de la période entre deux mises en communication successives des cylindres 14 avec un même collecteur, qui ne se renouvellent pas à l'intérieur de ce cycle.  These angular offsets give irregular variations in the period between two successive communication of the cylinders 14 with the same collector, which are not renewed within this cycle.
On prend les décalages maximum autorisés dans chaque sens pour les pistons à l'approche du point mort ou bas, sans risquer de problème de cavitation entraîné par des dépressions trop fortes, pour déterminer la plage totale de décalage. On utilise ensuite la largeur totale de cette plage pour créer les décalages angulaires maximum d'une ouverture à la suivante. On notera qu'une plage de décalage plus importante donne des meilleurs résultats pour l'atténuation des bruits de sirènes. En pratique la plage de décalage avantageusement comprise entre 2 et 4° , peut être centrée ou décalée sur l'axe du cylindre 14. On obtient par exemple pour une plage totale de 2° des décalages suivant : -1 °/+1 ° ou - 0.5°/+1 .5° , et pour une plage totale de 4° des déctages suivant : -1 °/+3° ou - 2°/+2° . The maximum allowable offsets in each direction are taken for the pistons when approaching neutral or low, without the risk of cavitation problems caused by too strong depressions, to determine the total offset range. The total width of this range is then used to create the maximum angular offsets from one opening to the next. Note that a larger offset range gives better results for attenuation of siren sounds. In practice the offset range advantageously between 2 and 4 °, can be centered or offset on the axis of the cylinder 14. For example, for a total range of 2 °, the following offsets can be obtained: -1 ° / + 1 ° or - 0.5 ° / + 1 .5 °, and for a total range of 4 ° the following decetages: -1 ° / + 3 ° or - 2 ° / + 2 °.
En particulier un bon résultat est obtenu avec une plage totale de 4° centrée sur l'axe du cylindre, qui donne des décalages de -2°/+2° .  In particular a good result is obtained with a total range of 4 ° centered on the axis of the cylinder, which gives shifts of -2 ° / + 2 °.
D'une manière générale, on peut appliquer le même procédé sur une autre machine comprenant un nombre différent de pistons.  In general, the same method can be applied to another machine comprising a different number of pistons.
Afin de déterminer les séquences de décalage des ouvertures donnant les meilleurs résultats concernant l'intensité et la signature des émissions sonores, un grand nombre de combinaisons ont été étudiées par les inventeurs. La méthode de brouillage de séquence appelée méthode « Scrambler », a été identifiée comme donnant les meilleurs résultats pour éliminer les bruits de sirène avec ses harmoniques, et approcher la signature sonore émise par un moteur thermique.  In order to determine the aperture shift sequences giving the best results regarding the intensity and the signature of the sound emissions, a large number of combinations have been studied by the inventors. The scrambler method of scrambling has been identified as providing the best results for eliminating siren noise with its harmonics, and approaching the sound signature emitted by a heat engine.
La méthode Scrambler est employée pour éliminer la dépendance du spectre de puissance acoustique au signal réel de départ, qui émet le bruit de sirène de la machine hydraulique, en le rendant plus dispersé pour étaler au maximum l'énergie acoustique des pics de fréquence sur une bande de fréquence plus large. Ce procédé réduit le niveau énergétique des fréquences émergentes donnant le bruit de sirène.  The Scrambler method is used to eliminate the dependence of the acoustic power spectrum on the actual starting signal, which emits the siren sound of the hydraulic machine, making it more dispersed to spread the acoustic energy of the frequency peaks to a maximum. wider frequency band. This process reduces the energy level of emerging frequencies giving the siren sound.
Il existe plusieurs méthodes de Scrambler. Une première méthode comprenant un procédé de calcul additif, transforme la séquence de données d'origine en une séquence pseudo-aléatoire, qui applique un ordre binaire pseudo-aléatoire appelé « PRBS » pour « Pseudo Random Binary Séquence », par l'addition de modules deux à deux. Une autre méthode de Scrambler comportant un procédé de calcul multiplicatif, exécute une multiplication du signal d'entrée par une fonction de transfert de Scrambler, pour donner des systèmes linéaires discrets. La figure 5 présente les résultats d'analyse pour une machine hydraulique utilisant la méthode de Scrambler sans ordre binaire pseudoaléatoire « PRBS », comprenant le procédé multiplicatif, et la figure 6 présentent les mêmes résultats pour une machine hydraulique utilisant la méthode de Scrambler avec l'ordre binaire pseudo-aléatoire « PRBS » comprenant le procédé additif. There are several methods of Scrambler. A first method including an additive calculation method, transforms the original data sequence into a pseudo-random sequence, which applies a pseudo-random binary order called "PRBS" for "Pseudo Random Binary Sequence", by the addition of modules two by two. Another method of Scrambler comprising a multiplicative calculation method, executes a multiplication of the input signal by a Scrambler transfer function, to give discrete linear systems. Figure 5 shows the analysis results for a hydraulic machine using the Scrambler method without pseudo-random binary order "PRBS", including the multiplicative process, and Figure 6 show the same results for a hydraulic machine using the Scrambler method with the pseudo-random binary order "PRBS" comprising the additive method.
On note que le deuxième et le troisième graphique de la figure 5 présente des successions de pics de fréquence formant des peignes, qui sont nettement plus détachés que ceux présentés par les mêmes graphiques de la figure 6. Le bruit de sirène avec l'ordre binaire pseudo-aléatoire « PRBS » comprenant le procédé additif est plus atténué, cette méthode donne de meilleurs résultats.  It is noted that the second and third graphs of Figure 5 show successions of frequency peaks forming combs, which are distinctly more detached than those presented by the same graphs in Figure 6. Siren noise with binary order pseudo-random "PRBS" including the additive process is more attenuated, this method gives better results.
La méthode « PRBS » donne une séquence binaire comprenant une suite de bits 0 ou 1 présentant un caractère pseudo-aléatoire, la valeur de chacun des éléments est indépendante de celle des autres. Cependant cette suite se renouvelle à chaque cycle de rotation de la machine, il s'agit donc d'une suite périodique, ce qui la rend déterministe.  The "PRBS" method gives a bit sequence comprising a sequence of bits 0 or 1 having a pseudo-random character, the value of each of the elements is independent of that of the others. However this sequence is renewed at each cycle of rotation of the machine, so it is a periodic sequence, which makes it deterministic.
Il existe plusieurs types de calcul pour la méthode « PRBS », qui donnent les séquences suivantes pour des machines comprenant entre trois et vingt pistons.  There are several types of calculation for the "PRBS" method, which give the following sequences for machines with between three and twenty pistons.
En particulier pour la machine à neuf pistons présentée ci-dessus, le type de calcul « PRBS 23 " comprenant la séquence « 1 ;0 ;0 ;1 ;0 ;1 ;1 ;1 ;0 », a donné des bons résultats. Pour le type de calcul « PRBS 23 >>, on obtient les résultats suivants : In particular for the nine-piston machine presented above, the type of calculation "PRBS 2 3 " comprising the sequence "1;0;0;1;0;1;1;1;0" gave good results. For the calculation type "PRBS 2 3" , the following results are obtained:
3 pistons 1 0 ;o  3 pistons 1 0; o
4 pistons 1 0 ;o 1  4 pistons 1 0; o 1
5 pistons 1 0 ;o 1 0  5 pistons 1 0; o 1 0
6 pistons 1 0 ;o 1 0 ;1  6 pistons 1 0; o 1 0; 1
7 pistons 1 0 ;o 1 0 ;1  7 pistons 1 0; o 1 0; 1
8 pistons 1 0 ;o 1 0 ;1  8 pistons 1 0; o 1 0; 1
9 pistons 1 0 ;o 1 0 ;1 pistons 1 ;0 ;0 ;1 ;o ;1 ; i ;1 ;0 ;0 9 pistons 1 0; o 1 0; 1 pistons 1; 0; 0; 1; o; 1; i; 1; 0; 0
pistons 1 ;0 ;0 ;1 ;o ;1 ; i ;1 ;0 ;0 ;1  pistons 1; 0; 0; 1; o; 1; i; 1; 0; 0; 1
pistons 1 ;0 ;0 ;1 ;o ;1 ; i ;1 ;0 ;0 ;1 ;o  pistons 1; 0; 0; 1; o; 1; i; 1; 0; 0; 1; o
pistons 1 ;0 ;0 ;1 ;o ;1 ; i ;1 ;0 ;0 ;1 ;o ;1  pistons 1; 0; 0; 1; o; 1; i; 1; 0; 0; 1; o; 1
pistons 1 ;0 ;0 ;1 ;o ;1 ; i ;1 ;0 ;0 ;1 ;o ;1 ;" pistons 1; 0; 0; 1; o; 1; i; 1; 0; 0; 1; o; 1; "
pistons 1 ;0 ;0 ;1 ;o ;1 ; i ;1 ;0 ;0 ;1 ;o ;1 ;" i ;1 pistons 1; 0; 0; 1; o; 1; i; 1; 0; 0; 1; o; 1; " i; 1
pistons 1 ;0 ;0 ;1 ;o ;1 ; i ;1 ;0 ;0 ;1 ;o ;1 ;" i ;1 ;0 pistons 1; 0; 0; 1; o; 1; i; 1; 0; 0; 1; o; 1; " i; 1; 0
pistons 1 ;0 ;0 ;1 ;o ;1 ; i ;1 ;0 ;0 ;1 ;o ;1 ;" i ;1 ;0 ;0 pistons 1; 0; 0; 1; o; 1; i; 1; 0; 0; 1; o; 1; " i; 1; 0; 0
pistons 1 ;0 ;0 ;1 ;o ;1 ; i ;1 ;0 ;0 ;1 ;o ;1 ;" i ;1 ;0 ;0 ;1 pistons 1; 0; 0; 1; o; 1; i; 1; 0; 0; 1; o; 1; " i; 1; 0; 0; 1
pistons 1 ;0 ;0 ;1 ;o ;1 ; i ;1 ;0 ;0 ;1 ;o ;1 ;" i ;1 ;0 ;0 ;1 pistons 1; 0; 0; 1; o; 1; i; 1; 0; 0; 1; o; 1; " i; 1; 0; 0; 1
pistons 1 ;0 ;0 ;1 ;o ;1 ; i ;1 ;0 ;0 ;1 ;o ;1 ;" i ;1 ;0 ;0 ;1 pistons 1; 0; 0; 1; o; 1; i; 1; 0; 0; 1; o; 1; " i; 1; 0; 0; 1
Pour un type de calcul « PRBS 24 », on obtient les résultats suivants pistons : 0 For a calculation type "PRBS 2 4 ", the following results are obtained pistons: 0
pistons : 0 ;0 pistons: 0; 0
pistons : 0 ;0 pistons: 0; 0
pistons : 0 ;0 0 pistons: 0; 0 0
pistons : 0 ;0 0 ;0 pistons: 0; 0 0; 0
pistons : 0 ;0 0 ;0 ;1 pistons: 0; 0 0; 0; 1
pistons : 0 ;0 0 ;0 ;1 ;1 pistons: 0; 0 0; 0; 1; 1
pistons  pistons
pistons  pistons
pistons  pistons
pistons  pistons
pistons  pistons
pistons  pistons
pistons  pistons
pistons  pistons
pistons  pistons
pistons  pistons
pistons pistons
Pour un type de calcul « PRBS 25 », on ob ient les résultats suivants : 3 pistons : 1 ;o ;o For a calculation type "PRBS 2 5 ", the following results are obtained: 3 pistons: 1; o; o
4 pistons : 1 ;o ;0 ;0  4 pistons: 1; 0; 0;
5 pistons : 1 ;o ;0 ;0 ;0  5 pistons: 1; o; 0; 0; 0
6 pistons : 1 ;o ;0 ;0 ;0 ;1  6 pistons: 1; o; 0; 0; 0; 1
7 pistons : 1 ;o ;0 ;0 ;0 ;1 ;  7 pistons: 1; o; 0; 0; 0; 1;
8 pistons : 1 ;o ;0 ;0 ;0 ;1 ;  8 pistons: 1; o; 0; 0; 0; 1;
9 pistons : 1 ;o ;0 ;0 ;0 ;1 ;  9 pistons: 1; o; 0; 0; 0; 1;
On obtient ainsi une solution n'ajoutant pas de coût supplémentaire sur la machine, qui permet réduire le niveau des émissions sonores, et d'apporter à ces émissions une signature nettement plus agréable ne perturbant pas le conducteur dans un mode de fonctionnement hybride, donnant des passages successifs d'une motorisation à l'autre de manière transparente pour le conducteur et ses passagers.  This results in a solution that does not add any additional cost to the machine, which makes it possible to reduce the level of noise emissions, and to bring to these emissions a much more pleasant signature that does not disturb the driver in a hybrid mode of operation, giving successive passages from one engine to another in a manner transparent to the driver and his passengers.

Claims

REVENDICATIONS
1 - Machine hydraulique comportant un barillet (12) entraîné en rotation par un arbre d'entrée (6), comprenant des cylindres (14) répartis autour de l'axe, recevant chacun un piston coulissant (16) en fonction de la rotation de l'arbre, chaque cylindre débouchant par une ouverture (30) sur une face transversale du barillet en appui sur une platine circulaire (24) disposant de collecteurs d'entrée et de sortie, les ouvertures (30) comportant par rapport à leurs cylindres (14), des décalages angulaires compris à l'intérieur d'une plage totale de décalage, caractérisée en ce que les décalages des ouvertures (30) sont disposés à l'une ou à l'autre extrémité de cette plage de décalage. 1 - hydraulic machine comprising a cylinder (12) rotated by an input shaft (6), comprising cylinders (14) distributed around the axis, each receiving a sliding piston (16) depending on the rotation of the shaft, each cylinder opening through an opening (30) on a transverse face of the cylinder bearing on a circular plate (24) having inlet and outlet manifolds, the openings (30) having with respect to their cylinders ( 14), angular offsets included within a total offset range, characterized in that the offsets of the apertures (30) are disposed at either end of this offset range.
2 - Machine hydraulique selon la revendication 1 , caractérisée en ce que la plage totale de décalage des ouvertures (30) est comprise entre 2 et 4° .  2 - hydraulic machine according to claim 1, characterized in that the total offset range of the openings (30) is between 2 and 4 °.
3 - Machine hydraulique selon la revendication 1 ou 2, caractérisée en ce que la plage de décalage pour chaque cylindre (14) est centrée sur l'axe du cylindre correspondant.  3 - hydraulic machine according to claim 1 or 2, characterized in that the offset range for each cylinder (14) is centered on the axis of the corresponding cylinder.
4 - Machine hydraulique selon l'une quelconque des revendications précédentes, caractérisée en ce qu'elle comporte neuf pistons (16) comprenant des décalages d'ouverture (30) d'un côté ou de l'autre de la plage de décalage, qui suivent la séquence suivante pour un décalage noté « 0 » d'un côté et « 1 » de l'autre : 1 ; 0 ; 0 ; 1 ; 0 ; 1 ; 1 ; 1 ; 0.  4 - hydraulic machine according to any one of the preceding claims, characterized in that it comprises nine pistons (16) comprising opening offsets (30) on one side or the other of the offset range, which follow the following sequence for an offset marked "0" on one side and "1" on the other: 1; 0; 0; 1; 0; 1; 1; 1; 0.
5 - Machine hydraulique selon l'une quelconque des revendications précédentes, caractérisée en ce que la séquence de décalage des ouvertures (30) est déterminée selon une méthode de calcul utilisant une méthode de brouillage de séquence du type « Scrambler ».  5 - hydraulic machine according to any one of the preceding claims, characterized in that the offset sequence of the openings (30) is determined according to a calculation method using a Scrambler sequence scrambling method.
6 - Machine hydraulique selon la revendication 5, caractérisée en ce que ladite méthode de calcul comporte un procédé de calcul additif, transformant la séquence de données d'origine en une séquence qui applique un ordre binaire pseudo-aléatoire du type « PRBS », par l'addition de modules deux à deux. 6 - hydraulic machine according to claim 5, characterized in that said calculation method comprises an additive calculation method, transforming the original data sequence into a sequence which applies a pseudo-random binary order of the "PRBS" type, by adding modules two by two.
7 - Véhicule automobile hybride disposant d'au moins une machine hydraulique utilisée pour la traction, caractérisé en ce que cette machine est réalisée selon l'une quelconque des revendications 1 à 6.  7 - Hybrid motor vehicle having at least one hydraulic machine used for traction, characterized in that this machine is made according to any one of claims 1 to 6.
EP14731746.5A 2013-06-12 2014-05-28 Hydraulic machine comprising cylinders provided with angularly offset openings Active EP3008340B1 (en)

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PCT/FR2014/051261 WO2014199041A1 (en) 2013-06-12 2014-05-28 Hydraulic machine comprising cylinders provided with angularly offset openings

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FR3038348B1 (en) 2015-07-01 2019-08-23 Poclain Hydraulics Industrie HYDRAULIC MACHINE WITH RADIAL PISTONS WITH HARMONIC DISTRIBUTION
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CH490610A (en) * 1967-06-09 1970-05-15 Karl Marx Stadt Ind Werke Hydraulic piston machine
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ZA935640B (en) * 1992-08-06 1995-08-08 Hydrowatt Syst Axial piston machine, in particular axial piston pump or axial piston motor
US5358388A (en) * 1994-01-27 1994-10-25 Eaton Corporation Noise reduction at the second order frequency
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ES2623707T3 (en) 2017-07-12
WO2014199041A1 (en) 2014-12-18

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