EP3358181B1 - Moteur hydraulique à cylindrée variable comportant un dispositif pour commander la variation de position d'une came excentrique du moteur et procédé pour commander la variation de position de la came excentrique du moteur hydraulique à cylindrée variable - Google Patents

Moteur hydraulique à cylindrée variable comportant un dispositif pour commander la variation de position d'une came excentrique du moteur et procédé pour commander la variation de position de la came excentrique du moteur hydraulique à cylindrée variable Download PDF

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Publication number
EP3358181B1
EP3358181B1 EP18154986.6A EP18154986A EP3358181B1 EP 3358181 B1 EP3358181 B1 EP 3358181B1 EP 18154986 A EP18154986 A EP 18154986A EP 3358181 B1 EP3358181 B1 EP 3358181B1
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EP
European Patent Office
Prior art keywords
motor
electrovalve
value
eccentric cam
parameter
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Application number
EP18154986.6A
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German (de)
English (en)
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EP3358181A1 (fr
Inventor
Loris De Leonardis
Giorgio CAZZATO
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Parker Hannifin Manufacturing SRL
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Parker Hannifin Manufacturing SRL
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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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • 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
    • F03C1/04—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement
    • F03C1/0403—Details, component parts specially adapted of such engines
    • F03C1/0406—Pistons
    • 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
    • F03C1/04—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement
    • F03C1/0403—Details, component parts specially adapted of such engines
    • F03C1/0415—Cylinders
    • 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
    • F03C1/04—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement
    • F03C1/0447—Controlling
    • F03C1/0457—Controlling by changing the effective piston stroke
    • F03C1/046—Controlling by changing the effective piston stroke by changing the excentricity of one element relative to another element
    • 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
    • F03C1/04—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement
    • F03C1/053—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement the pistons co-operating with an actuated element at the inner ends of the cylinders
    • 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
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0408—Pistons
    • 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
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0421—Cylinders
    • 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
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/053—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders
    • F04B1/0531—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders with cam-actuated distribution members
    • 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
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/06—Control
    • F04B1/07—Control by varying the relative eccentricity between two members, e.g. a cam and a drive shaft
    • 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
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/10—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement the cylinders being movable, e.g. rotary
    • F04B1/113—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement the cylinders being movable, e.g. rotary with actuating or actuated elements at the inner ends of the cylinders
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members
    • F04B49/123—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members by changing the eccentricity of one element relative to another element
    • F04B49/125—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members by changing the eccentricity of one element relative to another element by changing the eccentricity of the actuation means, e.g. cams or cranks, relative to the driving means, e.g. driving shafts

Definitions

  • the present invention relates to a variable-displacement hydraulic motor comprising an apparatus for controlling the position of an eccentric cam and to a method for controlling the position of said eccentric cam in said variable-displacement hydraulic motor.
  • Said motors may be of the fixed or variable displacement type.
  • the spherical part 306 of the driving shaft (not shown), in addition to rotating, may also be displaced with respect to the said shaft, thus changing its eccentricity and therefore the operational motor displacement of the motor.
  • the value of the motor displacement may be varied, during operation of the motor, in order to adapt the latter to the external load conditions, optimizing the performance thereof.
  • the motor is equipped with sensors which measure the speed of rotation of the shaft and the motor displacement, then sending respective signals to circuits for controlling the eccentric cam of the machine in which the motor is mounted.
  • both technologies are able to operate a proportional-control electrovalve depending on a signal supplied by the user;
  • the proportional valve operates in a constantly open condition, being operated by the control system so as to have a smaller opening for slow changes in motor displacement, or changes in motor displacement where the set displacement value is close to the existing value, and a larger opening for rapid changes in motor displacement, or changes in motor displacement where the set displacement value is far from the existing value; opening the valve slightly however means creating constrictions which reduce the pressure at its output, to the point of halving it or even reducing it to zero when the valve is nearly closed; in these cases the pressure output is no longer sufficient to counteract the forces exerted by the propulsion members on the eccentric cam and control the changes in motor displacement which, on the contrary, tends to vary in an uncontrolled manner.
  • US 4,983,099 discloses a variable-displacement hydraulic motor comprising a shaft, a wobbler and an apparatus for controlling the position of the wobbler, that in turn comprises a double-acting cylinder acting on the wobbler for changing the motor displacement of the motor, a servovalve having two outputs respectively connected to an associated chamber of the double-acting cylinder by means of hydraulic control lines arranged between the servovalve and the double-acting cylinder, wherein the servovalve is an example of proportionally controlled valve.
  • the technical problem which is posed, therefore, is that of providing an apparatus and a method for controlling the position of an eccentric cam connected to the shaft of a variable-displacement hydraulic motor, which provide a solution to the problems of the prior art, resulting in particular in variations of the eccentricity (and therefore motor displacement) which are fast and precise and also able to reduce substantially fluid leakages.
  • this apparatus should have small dimensions, be easy and inexpensive to produce and assemble and be able to be easily installed on any motor also already operating using normal standardized connection means.
  • variable-displacement hydraulic motor comprising an apparatus for controlling the position of an eccentric cam of the shaft of said variable-displacement hydraulic motor as defined in Claim 1.
  • the invention relates furthermore to a method for controlling the position of an eccentric cam of the shaft of a variable-displacement hydraulic motor as defined in Claim 10.
  • a variable-displacement hydraulic motor 300 is composed of a casing 301 which houses the propulsion members 310 consisting of a cylinder 311 and a piston 312.
  • each of the pistons 312 is placed in communication with a rotating distributor (not shown) housed inside a cover fastened to the casing 301 and designed to supply or discharge cyclically the pistons 312 in synchronism with rotation of the driving shaft.
  • the cylinders 311 are telescopically movable in a radial direction and rest against the outer surface of a spherical body 306, eccentrically movable in the radial direction relative to the axis of the driving shaft upon operation of associated means 308, said variation of eccentricity also determining the variation of motor displacement of the motor.
  • the motor is associated with means for detecting the motor displacement of the motor comprising, for example, at least one pair of sensors, each of which is arranged on the cap 302 of a respective propulsion member 310 with its longitudinal axis parallel to and axially offset with respect to the longitudinal axis of the propulsion unit 310 in the rest condition and a data processing unit for detecting and storing the signals emitted by the sensors and performing the calculations necessary for obtaining also the position of the point of eccentricity "E".
  • the hydraulic motor 300 is subject to an external torque 310a, transmitted via the driving shaft, to a flow 310b, which flows through the mouths which supply and discharge the said motor, and to a disturbing force, due to the thrust of the propulsion members 310 which, changing periodically intensity and direction during rotation of the driving shaft, tends to move the eccentric cam 306 radially, modifying the motor displacement in a manner which is too difficult to control.
  • the motor 300 reacts, generally, to variations in torque and flowrate by modifying its operating parameters 320 including the operating pressure 320b of the motor and the speed of rotation of the shaft 320c.
  • an increase in the torque 310a results in an increase in the pressure 320b (and vice versa), while an increase in the flowrate 310b results in an increase in the speed of the shaft 320c (and vice versa).
  • the apparatus, according to the invention, for controlling the position of the eccentric cam 306 of a variable-displacement hydraulic motor 300 comprises essentially a control and command unit 200 and an actuating unit 100.
  • the control and command unit 200 comprises a feedback loop (identified below by the same reference number 200 as the command unit) which comprises:
  • the actuating unit 100 comprises in turn a direct-control electrovalve 110 which has an input 110c for pressurized fluid 500a and an input 110d for discharged fluid 500b.
  • the electrovalve 110 is controlled by the control system 200 via two coils 110e and 110f from which it receives the activation/deactivation signals which, in a predefined and constant period, comprise a time interval of logic value 1 for opening the valve and a time interval of logic value 0 for closing the valve ( Fig. 4b ).
  • the electrovalve 110 also has two outputs 110a,110b, the end terminals of which are respectively connected to an associated chamber 350a,350b of a double-acting cylinder 350 which, via the piston 308, acts on the movable eccentric cam 306, changing the eccentricity thereof and therefore the motor displacement of the motor.
  • the hydraulic circuit situated between the electrovalve 110 and the cylinder 350 comprises two branches 120a,120b each comprising: rotary seals 121a,121b of the driving shaft, a stop valve 122a,122b, the input of which is driven by the fluid supplied from the corresponding output 110a,110b of the distribution valve 110 and each connected to the opposite branch of the input circuit of the other one, a throttle element 123a,123b arranged between the stop valves and the corresponding chamber 350a,350b of the double-acting cylinder 350 for operating the eccentric cam 306 which is thus displaced by the supplying/discharging of the two said chambers 350a,350b.
  • the throttle elements 123a,123b are designed to determine the speed of variation of the eccentricity, as will become clearer below.
  • the two throttle elements are adjustable so as to vary opening/closing thereof.
  • the operating principle of the apparatus for controlling the eccentric cam 306 for varying the motor displacement of a variable-displacement hydraulic motor is as follows: considering that control of the motor displacement may be performed alternately at a constant pressure or at a constant speed, the system controls continuously the existing value of the parameter selected, namely of the motor displacement 320a, pressure 320b or the speed 320c, comparing it with the corresponding desired value 250a;250b,250c of the said parameter, and acts via the actuating unit 100 so as to achieve the objective, i.e. the desired value of the selected parameter, modifying the position of the eccentric cam 306, and therefore the motor displacement, via the means 350,308.
  • the invention also provides a method for controlling the position of an eccentric cam of the shaft of a variable-displacement hydraulic motor by means of an apparatus as described above, said method comprising the following steps:
  • the method according to the invention envisages that the period of the command pulses of the electrovalve comprise time intervals of logic value 1 for opening the valve and time intervals of logic value 0 for closing the variable-duration valve.
  • said time intervals of logic value 1 have a longer duration if the existing value of the parameter to be controlled differs from the reference value set by an amount ranging between 25% and 30% of the said desired value, and shorter duration if said value is between 0.5% and 1.5% of the desired value.
  • the method comprises a step of adjusting the speed of variation of the eccentricity of the motor, by means of throttle elements 123a,123b arranged in the hydraulic circuit of the actuating unit; preferably opening/closing of said throttle elements is adjustable.
  • the method performs the control of at least one parameter 320 from among the motor displacement 320a, the pressure 320b or the speed 320c and that the command and control unit 200 comprises an adder 240 which receives at its input said existing values 320a,320b,320c of the at least one parameter and respective set/stored reference values 250a,250b,250c and emits a difference signal 240a,b,c, for said at least one selected parameter, which it sends to the input of a processing unit 260.
  • a direct-control distribution valve 110 which is always fully open when activated, but controlled by means of pulses of variable length in a predefined maximum time period, in combination with stop valves for stopping the flow of the fluid, ensure that in the cylinder actuating the eccentric cam there is always sufficient pressure to control the movements of the said eccentric and that the activation of the electrovalve with variable pulses allows the use of pulses of longer duration, when the existing value of the parameter to be controlled differs greatly from the desired value, and pulses of much shorter duration, when said value is close to the desired value, locking the eccentric cam in position between one excitation period and the other of the valve, ensuring at the same time also that precision in variation of the motor displacement necessary for correct operation of the motor.
  • the maximum speed of motor displacement of the eccentric cam 306 and therefore of the system for varying the motor displacement may be adjusted by means of calibration of the throttle elements 123a,123b.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Computer Hardware Design (AREA)
  • Hydraulic Motors (AREA)
  • Valve Device For Special Equipments (AREA)
  • Control Of Fluid Gearings (AREA)
  • Fluid-Pressure Circuits (AREA)

Claims (17)

  1. Moteur hydraulique à cylindrée variable (300) comprenant un arbre, une came excentrique (306) et un appareil pour commander la position de la came excentrique (306), qui comprend :
    - un moyen (350) pour mouvoir la came excentrique (306), comprenant un cylindre à double effet (350) agissant via un piston (308) sur la came excentrique (306) pour changer son excentricité et par conséquent la cylindrée moteur du moteur ;
    - une unité d'actionnement (100) pour actionner la came excentrique (306), comprenant une électrovanne (110) ayant deux sorties (110a, 110b) raccordées respectivement à une chambre (350a, 350b) associée du cylindre à double effet (350), et un circuit de commande hydraulique (120a, 120b) pour commander le moyen (350) pour mouvoir la came excentrique (306), agencé entre les sorties (110a, 110b) de l'électrovanne (110) et le cylindre à double effet (350) ;
    - une unité de commande et d'ordre (200), qui est connectée en rétroaction entre des points pour détecter un ou plusieurs paramètres de fonctionnement (320a, 320b, 320c) existants du moteur (300) et des points pour entrer des valeurs de consigne (250a, 250b, 250c) pour les un ou plusieurs paramètres de fonctionnement du moteur et qui est conçue pour commander un fonctionnement de l'unité d'actionnement (100) pour actionner la came excentrique (306), dans lequel
    ladite électrovanne (110) est du type à commande directe qui est toujours totalement ouverte lorsqu'elle est activée et est entraînée par des impulsions ayant une période prédéfinie avec des intervalles d'ouverture/de fermeture de durée variable émises par l'unité de contrôle et de commande (200) en fonction de la différence entre une valeur existante détectée (320, 320b, 320c) et une valeur (250a, 250b, 250c) stockée souhaitée (262) de l'un desdits paramètres,
    et le circuit de commande hydraulique (120a, 120b) comprend des vannes d'arrêt (122a, 122b) pour arrêter le fluide d'actionnement qui restent fermées lorsque l'électrovanne (110) n'est pas excitée pour l'ouverture, verrouillant la came excentrique en position entre une excitation et l'autre de l'électrovanne.
  2. Moteur selon la revendication 1, caractérisé en ce que la période des impulsions d'ordre de l'électrovanne (110) comprend des intervalles de valeur logique 1 pour ouvrir l'électrovanne et des intervalles de valeur logique 0 pour fermer l'électrovanne, de durée variable.
  3. Moteur selon la revendication 2, caractérisé en ce que lesdits intervalles de valeur logique 1 ont une durée plus longue, si la valeur existante du paramètre à commander diffère d'une valeur entre 25 % et 30 % de la valeur souhaitée, et une durée plus courte, si ladite valeur se trouve entre 0,5 % et 1,5 % de la valeur souhaitée.
  4. Moteur selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'unité de commande et d'ordre (200) comprend :
    - un dispositif de commande (260) avec un microprocesseur (262) connecté à l'unité d'actionnement (100) et une unité de mémoire (261) ;
    - un système de mesure (230) conçu pour recevoir les valeurs existantes des un ou plusieurs paramètres (320a, 320b, 320c) du moteur (300) et pour émettre des signaux correspondants (230a, 230b, 230c) ;
    - un additionneur (240) conçu pour recevoir au niveau de son entrée lesdites valeurs existantes (320a, 320b, 320c) et des valeurs de référence (250a, 250b, 250c) respectives définies par l'utilisateur (250) et stockées dans l'unité de mémoire (261) et pour émettre un signal de différence (240a, b, c) pour ledit au moins un paramètre à envoyer à l'entrée de l'unité de traitement (260).
  5. Moteur selon l'une quelconque des revendications 1 à 4, caractérisé en ce que ledit au moins un paramètre (320) à commander est au moins l'une parmi : la cylindrée moteur (320a), la pression (320b) ou la vitesse (320c) de rotation de l'arbre de moteur.
  6. Moteur selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit circuit de commande hydraulique situé entre les sorties (110a, 110b) de l'électrovanne (110) et le cylindre (350) pour actionner la came excentrique (306) comprend deux dérivations (120a, 120b) comprenant chacune: des joints rotatifs (121a, 121b) de l'arbre d'entraînement, et l'une desdites vannes d'arrêt (122a, 122b), dont l'entrée est entraînée par le fluide fourni depuis la sortie correspondante (110a, 110b) de l'électrovanne de distribution (110) et chacune étant connectée à la dérivation opposée du circuit d'entrée de l'autre.
  7. Moteur selon la revendication 6, caractérisé en ce que chaque dérivation du circuit hydraulique (120a, 120b) comprend un élément papillon (123a, 123b) agencé entre les vannes d'arrêt et la chambre (350a, 350b) correspondante du cylindre d'actionnement à double effet (350) et conçu pour déterminer la vitesse de variation d'excentricité du moteur.
  8. Moteur selon la revendication 7, caractérisé en ce que les deux éléments papillon (123a, 123b) sont ajustables de façon à faire varier leur ouverture/fermeture.
  9. Moteur selon la revendication 1, dans lequel l'appareil pour commander la position de la came excentrique (306) est configuré de telle sorte que, si la valeur existante du paramètre à commander est égale à la valeur souhaitée, inférieure à une marge d'erreur admissible, l'électrovanne (110) n'est pas excitée, moyennant quoi les vannes d'arrêt restent fermées et la cylindrée moteur du moteur reste fixe à la valeur existante.
  10. Procédé pour commander la position d'une came excentrique (306) de l'arbre d'un moteur hydraulique à cylindrée variable (300) selon l'une quelconque des revendications précédentes, comprenant les étapes suivantes :
    - le démarrage du moteur et
    - la détection de la valeur existante (320) d'au moins un paramètre de fonctionnement (320a, 320b, 320c) de celui-ci ;
    - la sélection d'une période de durée maximale des impulsions pour ouvrir/fermer l'électrovanne ;
    - la sélection de l'un desdits paramètres de fonctionnement à commander ;
    - la comparaison de la valeur existante (320) du paramètre sélectionné à une valeur de référence (250) définie/stockée correspondante,
    - l'émission et l'envoi d'un signal (240a, b, c) pour la différence entre lesdites valeurs du paramètre sélectionné à l'unité de commande et d'ordre (200) ;
    - l'envoi, par l'unité de commande et d'ordre (200), du signal de différence (240a, b, c) à l'unité d'actionnement (100) ;
    - l'envoi à l'électrovanne (110), par l'unité d'actionnement (100), d'impulsions d'excitation de durée variable pour ouvrir l'électrovanne, ayant une durée déterminée sur la base du signal de différence (240a, b, c) reçu ;
    - l'ouverture de l'électrovanne (110) de façon à alimenter le circuit de commande hydraulique pour effectuer une cylindrée de la came excentrique (306) ;
    - dans lequel ladite électrovanne est du type à commande directe qui est toujours totalement ouverte lorsqu'elle est activée et dans lequel les vannes d'arrêt (122a, 122b) pour arrêter le fluide d'actionnement restent fermées lorsque l'électrovanne (110) n'est pas excitée pour l'ouverture, verrouillant la came excentrique en position entre une excitation et l'autre de l'électrovanne.
  11. Procédé selon la revendication 10, caractérisé en ce que la période des impulsions d'ordre pour l'électrovanne (110) comprend des intervalles de logique 1 pour ouvrir la vanne et des intervalles de logique 0 pour fermer la vanne, qui sont de durée variable.
  12. Procédé selon la revendication 11, caractérisé en ce que lesdits intervalles de valeur logique 1 ont une durée plus longue, si la valeur existante du paramètre à commander diffère de la valeur de référence de consigne d'une quantité entre 25 % et 30 % de ladite valeur souhaitée et une durée plus courte si ladite valeur se trouve entre 0,5 % et 1,5 % de la valeur souhaitée.
  13. Procédé selon la revendication 10 ou 11 ou 12, caractérisé en ce qu'il comprend une étape d'ajustement de la vitesse de variation de l'excentricité du moteur, au moyen d'éléments papillon (123a, 123b) agencés dans le circuit de commande hydraulique de l'unité d'actionnement.
  14. Procédé selon la revendication 13, caractérisé en ce que l'ouverture/la fermeture desdits éléments papillon est ajustable.
  15. Procédé selon l'une quelconque des revendications 10 à 14, caractérisé en ce que ledit au moins un paramètre (320) à commander est au moins l'une parmi: la cylindrée moteur (320a), la pression (320b) ou la vitesse (320c) de rotation de l'arbre de moteur.
  16. Procédé selon l'une quelconque des revendications 10 à 15, caractérisé en ce que l'unité de commande et d'ordre (200) comprend un additionneur (240) qui reçoit au niveau de son entrée lesdites valeurs existantes (320a, 320b, 320c) de l'au moins un paramètre et des valeurs de référence (250a, 250b, 250c) définies/stockées respectives et émet un signal de différence (240a, b, c) pour ledit au moins un paramètre sélectionné, qu'il envoie à l'entrée d'une unité de traitement (260).
  17. Procédé selon la revendication 10, dans lequel, si la valeur existante du paramètre à commander est égale à la valeur souhaitée, inférieure à une marge d'erreur admissible, l'électrovanne (110) n'est pas excitée, moyennant quoi les vannes d'arrêt restent fermées et la cylindrée moteur du moteur reste fixe à la valeur existante.
EP18154986.6A 2017-02-06 2018-02-02 Moteur hydraulique à cylindrée variable comportant un dispositif pour commander la variation de position d'une came excentrique du moteur et procédé pour commander la variation de position de la came excentrique du moteur hydraulique à cylindrée variable Active EP3358181B1 (fr)

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Application Number Priority Date Filing Date Title
IT102017000012623A IT201700012623A1 (it) 2017-02-06 2017-02-06 Metodo e apparecchiatura per il controllo della variazione di posizione di un eccentrico di motori idraulici a cilindrata variabile

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EP3358181B1 true EP3358181B1 (fr) 2020-07-01

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JP7120125B2 (ja) * 2019-03-29 2022-08-17 いすゞ自動車株式会社 流体作動機械
JP7120124B2 (ja) * 2019-03-29 2022-08-17 いすゞ自動車株式会社 流体作動機械

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DE4308198C1 (de) * 1993-03-15 1994-07-28 Rexroth Mannesmann Gmbh Drehmomentregelung über Schwenkwinkel bzw. Exzentrizität bei hydrostatischen Maschinen mit axialer und radialer Kolbenanordnung
US6038871A (en) * 1998-11-23 2000-03-21 General Motors Corporation Dual mode control of a variable displacement refrigerant compressor
JP3794960B2 (ja) * 2001-03-15 2006-07-12 ナブテスコ株式会社 流体モータの駆動回路
ITMI20041598A1 (it) * 2004-08-03 2004-11-03 Parker Calzoni S R L Procedimento e apparecchiatura per la determinazione di almeno un parametro istantaneo di funzionamento in motori a cilindrata variabile
DE102005037619B4 (de) * 2005-08-09 2020-07-09 Brueninghaus Hydromatik Gmbh Regelventileinheit mit Wechselanschlag
DE102009054876A1 (de) * 2009-12-17 2011-06-22 ZF Friedrichshafen AG, 88046 Verfahren zur Bestimmung des Schluckvolumens einer Radialkolbenmaschine
KR101637571B1 (ko) * 2009-12-23 2016-07-20 두산인프라코어 주식회사 건설기계의 유압펌프 제어장치 및 제어방법
DE102014226378A1 (de) * 2014-02-18 2015-08-20 Robert Bosch Gmbh Elektrisch angesteuertes Druckregelventil für eine verstellbare hydrostatische Pumpe
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