EP4261413B1 - Dispositif et procédé de détermination d'un état, en particulier d'un état d'usure, d'une unité de déplacement - Google Patents

Dispositif et procédé de détermination d'un état, en particulier d'un état d'usure, d'une unité de déplacement Download PDF

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Publication number
EP4261413B1
EP4261413B1 EP23164766.0A EP23164766A EP4261413B1 EP 4261413 B1 EP4261413 B1 EP 4261413B1 EP 23164766 A EP23164766 A EP 23164766A EP 4261413 B1 EP4261413 B1 EP 4261413B1
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EP
European Patent Office
Prior art keywords
fluid
displacement unit
pressure
condition
fluid line
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EP23164766.0A
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German (de)
English (en)
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EP4261413C0 (fr
EP4261413A1 (fr
Inventor
Tobias DOHMEN
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Hydac Fluidtechnik GmbH
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Hydac Fluidtechnik GmbH
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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
    • F04B51/00—Testing machines, pumps, or pumping installations
    • 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
    • F04B1/34—Control not provided for in groups F04B1/02, F04B1/03, F04B1/06 or F04B1/26
    • 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
    • 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
    • F04B2205/00—Fluid parameters
    • F04B2205/05—Pressure after the pump outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/80—Diagnostics

Definitions

  • the invention relates to a device and a method for determining a condition in the form of a wear condition of a displacement unit.
  • the device has a recording unit that has sensors mounted on and in the axial piston machine for recording operating data, in particular a pressure in a high-pressure line of the axial piston machine, and for recording monitoring data.
  • the operating data and the monitoring data are each analyzed in the time domain or in the time and frequency domain by an evaluation device connected to the recording unit.
  • an evaluation device connected to the recording unit.
  • the analyzed operating and monitoring data are linked, and an output unit connected to the diagnostic unit can trigger a pre-alarm, which indicates the next upcoming maintenance, and a main alarm with respect to a machine condition. which indicates a machine condition that is critical for further operation and can activate an emergency switch.
  • the invention is based on the object of providing a device for determining the state of wear of a To provide a displacement unit that allows for accurate condition determination with reduced effort in carrying out the condition determination.
  • the device has a fluid line connected to a high-pressure side of the displacement unit; at least one fluid device fluidically connected to the fluid line, which enables a fluid pressure build-up upstream of itself in the fluid line; in each case a pressure sensor which detects a system variable in the form of the fluid pressure in the fluid line upstream of the respective fluid device; and an evaluation device which is configured such that it determines the condition, in particular the wear condition, of the displacement unit as a function of at least one system variable.
  • a fluid pressure can be built up, maintained and, if necessary, reduced again in the fluid line as a system variable depending on a corresponding control of the displacement unit, wherein in the corresponding curve of the fluid pressure a change in the curve which is significant for the state of the respective displacement unit can be recognized which characterizes a characteristic operating point of the displacement unit at which the theoretical volume flow of the displacement unit corresponds to its volumetric losses, and wherein a comparison of system variables, in particular the fluid pressure, at the operating point or at least one parameter dependent thereon, in particular of the displacement unit, with corresponding reference values allows a precise conclusion to be drawn about the state of the displacement unit.
  • the fluid pressure change can occur during a diagnostic run, a start-up or shutdown of a fluid device in the form of the consumer arrangement.
  • the system variables are processed exclusively in the time domain by means of the evaluation device, whereby, in relation to the at least partial processing in the frequency domain, less computing power can be provided by the evaluation device and a lower sampling frequency of the sensors, and smaller amounts of data need to be processed. This means that the state can be determined with little effort.
  • the device is provided outside the displacement unit, which means that the device can be combined with any displacement unit at any time, for example, it can be retrofitted after the displacement unit has been sold.
  • a further fluid device which divides the fluid line into a fluid line part connected to the displacement unit and a further fluid line part and which is designed in such a way that it allows a transfer of fluid pressure from one fluid line part to the further fluid line part, in particular from a predeterminable pressure threshold, and blocks it in the opposite direction.
  • a temperature sensor is provided which, as a further system variable, measures the temperature of the of the fluid flowing through the displacement unit. This fluid temperature can be detected by the temperature sensor in the fluid line or in a tank from which the displacement unit draws fluid in and/or from which the consumer arrangement discharges fluid.
  • the displacement unit is designed to be hydrostatic and/or speed-adjustable.
  • the displacement unit is designed as a pump, preferably as a fixed-displacement pump.
  • the fluid used can be hydraulic fluid, in particular hydraulic oil, so that the fluid components of the device are accordingly designed as hydraulic components.
  • the respective fluid device in the form of a fluid control device can be configured such that the fluid pressure upstream in the fluid line is built up at least to a predeterminable pressure and/or by corresponding control of the respective fluid device.
  • a fluid device is designed as a consumer assembly operable at a nominal pressure, which is connected to the fluid line, in particular to an end of the fluid line facing away from the displacement unit.
  • the consumer assembly can have a controllable valve device that, when appropriately controlled, enables the aforementioned pressure buildup and/or a pressure relief valve set to the nominal pressure, which protects the consumer assembly against a pressure above the nominal pressure.
  • a device determines a drive speed of the displacement unit, which is included as a further system variable in the determination of the state.
  • the device can be designed as a speed sensor that measures the speed at the displacement unit or at a device driving the displacement unit. Electric motor is detected. The speed of the electric motor and the displacement unit can be the same.
  • a hydraulic accumulator is provided which is connected to the fluid line, in particular the further fluid line part, for the purpose of compensating a pressure drop.
  • the nominal or load pressure of the consumer arrangement is detected, preferably by means of the additional pressure sensor, which is included as a system variable in determining the state.
  • the additional fluid pressure detected by the additional pressure sensor can correspond to the nominal or load pressure of the consumer arrangement.
  • a device that determines a pivot angle of the displacement unit, which is incorporated as a further system variable in determining the state.
  • the displacement unit is designed as a variable-displacement pump, for example, an axial piston pump.
  • the invention also relates to a method for determining a condition, in particular a wear condition, of a displacement unit, in particular using a device as described above, comprising the following method steps: building up a fluid pressure in a fluid line upstream of at least one fluid device fluidically connected to the fluid line, wherein the fluid line is connected to the high-pressure side of the displacement unit; detecting a system variable in the form of the respective fluid pressure in the fluid line upstream of the respective fluid device; determining the condition of the displacement unit as a function of at least one system variable, and that for determining the condition of the displacement unit, at least one operating point of the displacement unit which is characteristic of the condition is determined by the theoretical volume flow Q th of the displacer unit corresponding to its volumetric losses Q leak .
  • the state is also determined as a function of at least one of the following additional system variables: a drive speed of the displacer unit; a pivot angle of the displacer unit; and a temperature of the fluid flowing through the displacer unit.
  • the drive speed of the displacement unit is determined at least in one of the following ways: detected by means of a speed sensor; derived from a signal attributable to an electrical control of the electric motor for driving the displacement unit; and derived from sound signals emitted by the displacement unit.
  • At least one of the following change processes is carried out over a period of time: the drive speed of the displacement unit is changed; a nominal or load pressure of a consumer arrangement connected to the fluid line, in particular to the end of the fluid line facing away from the displacement unit, is changed; and a pivot angle of the displacement unit is changed.
  • the drive speed, the nominal or load pressure, and/or the pivot angle are increased and/or decreased during the change process, preferably initially increased and subsequently decreased again, or vice versa.
  • the sampling period of the respective curve of the fluid pressure or a curve dependent thereon during the increase or decrease the drive speed of the displacement unit up to 3 seconds, preferably approx. 0.5 or 2.5 seconds, and/or the sampling rate 100 to 300 Hertz, preferably 200 Hertz.
  • the drive speed of the displacement unit is reduced, in particular in a ramp-like manner, starting from a positive value in the direction of zero within the scope of the change process, during which the curve profile of at least one respective fluid pressure is initially substantially constant, in particular corresponding to the nominal pressure value of the consumer arrangement, and subsequently begins to decrease when a certain speed is undershot, which represents the significant change in the curve.
  • the future state, in particular the wear state, and/or the remaining service life of the displacer unit is estimated based on a temporal analysis of the change in at least one system variable at the operating point or a parameter dependent thereon, in particular the displacement unit. Accordingly, the device according to the invention and the method according to the invention can be used to determine the future state, in particular the wear state, and/or the remaining service life of the displacement unit.
  • DAD pressure-knee-speed.
  • the theoretical volume flow Q th of the displacer unit corresponds to its internal leakage flow Q Leck , so that the volumetric efficiency ⁇ vol of the displacer unit is zero.
  • the device shown for determining a condition, in particular a wear condition, of a displacement unit 8 has, according to a first exemplary embodiment, a pressure supply connection P and a fluid line 12, 14 connected at one end to the pressure supply connection P.
  • the fluid devices 18 each enable a fluid pressure build-up upstream of themselves in the fluid line 12, 14, and the evaluation device 24 is configured such that it determines the condition, in particular the wear condition, of the displacement unit 8 as a function of at least one system variable p, p' .
  • the hydrostatic displacement unit 8 is connected to the pressure supply connection P, i.e., one end of the fluid line 12, 14, with its high-pressure side.
  • the displacement unit 8 is designed as a speed-controlled pump 10, preferably as a fixed-displacement pump, which is driven by an electric motor 26.
  • a consumer connection A is provided, to which a fluid device (not shown in the figures) is fluidically connected.
  • This fluid device can be designed as a consumer arrangement operable at a nominal pressure p Nominal .
  • a further fluid device 18 is connected to the fluid line 12, 14 and divides the fluid line 12, 14 into a fluid line part 12 fluidically connected to the pressure supply connection P and a further fluid line part 14 fluidically connected to the consumer connection A.
  • the further fluid device 18 is designed such that it allows fluid pressure to be passed on from the pressure supply connection P to the consumer connection A above a predeterminable pressure threshold, which in particular corresponds approximately to the nominal pressure p nominal of the consumer arrangement, and permanently blocks fluid pressure from the consumer connection A to the pressure supply connection P.
  • the further fluid device 18 is designed as a check valve 28, in particular a spring-actuated one, which opens in the direction of the consumer connection A.
  • a device 30 for determining the drive speed n of the pump 10 is provided, which is designed as a speed sensor 32 for detecting the speed n of the electric motor 26.
  • a pressure sensor 20 is also provided, which is connected to the fluid line part 12 and detects a fluid pressure p in the fluid line part 12.
  • a temperature sensor 34 which can detect the fluid temperature T in the fluid line part 12, can also be connected to the fluid line part 12.
  • a hydraulic accumulator 36 can be connected to the further fluid line part 14 to compensate for any pressure losses in the further fluid line part 14, for example due to leakage flows from the consumer arrangement.
  • the speed sensor 32, the pressure sensor 20, and the temperature sensor 34 are electrically connected to the evaluation device 24.
  • the drive speed n of the pump 10, the fluid pressure p and the temperature T thus recorded each represent a further system variable which is included in the determination of the state by means of the evaluation device 24.
  • a further pressure sensor 22 is connected to the further fluid line part 14 and detects a further fluid pressure p' in the further fluid line part 14, which is included as a further system variable in determining the state.
  • the further pressure sensor 22 is electrically connected to the evaluation device 24.
  • the further fluid pressure p' can correspond to the nominal pressure p nominal of the consumer arrangement. A pressure loss when flowing through the check valve 28 results in a pressure difference, so that the pressure p is greater than the pressure p' by the pressure difference. With a good design of the check valve 28, the pressure difference is rather small.
  • a characteristic operating point of the pump 10 is determined, in which the theoretical volume flow Q th of the pump 10 corresponds to its volumetric losses Q leak , i.e. the volumetric efficiency ⁇ vol of the pump 10 is zero.
  • the drive speed n of the pump 10 is measured within a Fig. 2 shown change process over a period of time [s] from approximately zero to a predeterminable speed value n [ min -1 ] and then reduced again to approximately zero.
  • the speed n can be increased at least to such an extent that the fluid pressure p prevailing on the high-pressure side of the pump 10 reaches at least the nominal pressure p nominal of the consumer arrangement.
  • the drive speed n is detected during the change process by means of the speed sensor 32 and can describe a substantially triangular curve n V , thus in principle can have an increasing ramp followed by a decreasing ramp 41.
  • the drive speed n is determined by means of the pressure sensor 20 in the fluid line part 12.
  • Fig. 3 shown fluid pressure curve p V and by means of the temperature sensor 34 the temperature T in the fluid line part 12 is detected.
  • the fluid pressure curve p' V or p Nenn,V in the further fluid line part 14 is also detected by means of the further pressure sensor 22.
  • the sampling period AZ of the respective fluid pressure curve during the reduction of the drive speed n of the pump 10 can be as in Fig. 3
  • the time interval can be approximately 0.5 seconds, or, as not shown in the figures, 2.5 seconds, for example, with the sampling rate being approximately 200 Hertz. The same can apply to the period of increasing the drive speed n.
  • each system variable n, p, p', T can be subjected to data filtering 40, for example, an average of the respective system variable values n, p, p', T can be formed from the last recorded system variable values n, p, p', T in the sense of a moving average.
  • the fluid pressure curve p V [bar] of the pressure sensor 20 shown which is plotted against time [s], is essentially trapezoidal, i.e. it has an ascending and a descending ramp 42, between which the fluid pressure curve p V has an essentially constant part 44 and in particular corresponds to the nominal pressure curve p Nenn,V of the consumer arrangement.
  • the fluid pressure curve p V describes a significant change in its curve 46 in the form of a bend, which characterizes the aforementioned characteristic operating point.
  • the significant change in the curve 46 results from the fact that any pump, when the drive speed falls below a certain value n , namely the drive speed n DAD at the specified operating point, is no longer in the
  • the fluid pressure p' or nominal pressure p Nenn of the consumer arrangement prevailing in the fluid flow direction behind the check valve 28 is applied, so that the volume flow via the check valve 28 comes to a complete standstill when the specific drive speed n is undershot and the check valve 28 closes.
  • the fluid pressure p also continues to fall, whereby the fluid pressure p' or p Nenn can be maintained at least briefly by means of the hydraulic accumulator 36 due to the check valve 28 closing in the direction of the pressure supply connection P.
  • a part of the falling ramp 41 of the speed n [ min -1 ] and at the bottom, at least partially, the essentially constant part 44 and the falling ramp 42 of the fluid pressure p [bar] dependent on the speed n of several pumps 10 are shown in principle, which differ in terms of their wear state.
  • the speed n and the fluid pressure p are each plotted against time [s].
  • the various wear states of the pumps 10 are shown in Fig. 4 This can be seen in the fact that the fluid pressure p of the most worn pump 10 drops at a higher speed n and the fluid pressure p of the least worn pump 10 drops at a relatively lower speed n , in each case with the formation of the significant change 46 in the pressure curve p V .
  • the speed n equals zero
  • the respective fluid pressure p delivered by each pump 10 is also zero, regardless of their respective state of wear. In an ideal pump, the pressure would still be present; of course, the pumped volume flow would be zero.
  • the said operating point is located in the fluid pressure curve p V by the evaluation device 24 by means of an evaluation algorithm 48.
  • a temporal change curve is determined by means of the evaluation algorithm 48, in particular by calculating the pressure gradient by means of (backward) difference quotient formation.
  • p ⁇ V dp V dt of the fluid pressure of the pressure sensor 20.
  • the significant change 46 of the pressure curve p V is located in the change curve ⁇ V by performing an intermediate comparison 48 of the change curve ⁇ V with corresponding reference values 49 in the form of limit values.
  • the significant change 46 in the pressure curve p V [bar] is determined according to Fig. 5 by performing an intermediate comparison 48 of the pressure curve p V with reference values 49 in the form of limit values ⁇ p RV,min , ⁇ p RV,max , between which the significant change in the curve 46 can be found.
  • the pressure curve p V is plotted against the speed n [ min -1 ].
  • the additional fluid pressure p' or p Nenn measured by the additional pressure sensor 20 is included in the calculation of the limit values ⁇ p RV,min , ⁇ p RV,max .
  • the fluid pressure p DAD in the respective localized significant change in the curve 26, i.e. at the operating point, is marked with a cross.
  • pattern recognition can be used to evaluate the respective curve progression.
  • Pattern recognition can be implemented using artificial intelligence, neural networks, and/or machine learning.
  • the parameter ⁇ Q Leck ⁇ p p of the pump 10 temperature dependent.
  • Fig. 6 The temperature dependence of the parameter ⁇ of the pump 10 is shown in which a first to third parameter ⁇ of the pump 10 is plotted at a first T 1 , a second T 2 , or a third T 3 temperature against the wear condition of the pump.
  • T 3 in particular equal to approximately 70°C, is greater than T 2 , in particular equal to approximately 50°C, greater than T 1 , in particular equal to approximately 30°C.
  • the wear condition is divided into different zones along the x-axis: New 88, Zone I (green), Zone II (yellow), Zone III (light red), and Zone IV (dark red), with the wear condition increasing with increasing zone numbering.
  • the color assignment of the zones is based on a traffic light, which can serve as an indicator 54 of the wear condition for a user.
  • the viscosity value of the hydraulic fluid at temperature T 1 corresponds approximately to twice the viscosity value of the hydraulic fluid at Temperature T 2 , which in turn corresponds to approximately twice the viscosity of the hydraulic fluid at temperature T 3 . Accordingly, the calculated parameter ⁇ of the pump 10 and the corresponding reference parameter ⁇ are compared with each other in the final comparison 60, taking into account the measured fluid temperature T.
  • the state of the pump 10 is then determined, which can be forwarded by the evaluation device 24 via a state output 66 to a display 54, which displays the state of the pump 10 to a user and which can be designed in particular as the traffic light mentioned above.
  • a buffer 68 for recorded system variables n , p, p', T and a memory 70 for system variables n DAD , p DAD , T DAD present at the operating point and/or at least the one parameter dependent on system variables, in particular of the pump 10, can be provided.
  • a future wear state and/or the remaining service life 74 of the pump 10 can also be estimated by performing a (trend) analysis 72 based on a temporal analysis of the system variables n DAD , p DAD , T DAD at the operating point or of the parameter dependent on system variables.
  • the pump 10, the electric motor 26, which drives the pump 10 via a shaft, and a power electronics 78, such as a frequency converter 80 or an inverter, which controls the electric motor 26, are part of a variable-speed electro-hydraulic unit 76 ( Fig. 8 ).
  • a machine control 82 is provided, for example for controlling the consumer arrangement, such as a programmable logic controller or a (main) control unit, which provides at least one desired variable, such as a rotational speed, a volume flow, a position, a pressure and/or a speed, etc.
  • the machine control can be configured either as in Fig. 8 shown with the power electronics 78 or as not shown in the figures with the evaluation device 24 and transmits at least the target value there.
  • the evaluation device 24 requests the execution of the method according to the invention by issuing a request 84 from the power electronics 78, for example, after a predeterminable number of operating hours of the consumer arrangement.
  • the power electronics 78 subsequently confirms the request 84 by issuing a confirmation 86 and, if a suitable state of the consumer arrangement is present, initiates the method by a corresponding change process, for example, a corresponding change in the drive speed n of the pump 10.
  • a suitable system state exists, for example, when the system is not operating under load and/or is about to be shut down.
  • the drive speed n of the displacement unit 8 can also be specified as constant, the fluid pressure p dependent on the drive speed n can be detected and the detected fluid pressure p or a parameter dependent thereon, in particular of the displacement unit 8, can be compared with at least one corresponding reference value.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)

Claims (13)

  1. Installation de détermination d'un état sous la forme d'un état d'usure d'une unité (8) de refoulement, comprenant
    - un conduit (12, 14) pour du fluide raccordé à un côté haute pression de l'unité (8) de refoulement,
    - au moins un dispositif (18) fluidique, qui communique fluidiquement avec le conduit (12, 14) pour du fluide et qui permet l'établissement en amont de lui d'une pression de fluide dans le conduit (12, 14) pour du fluide,
    - respectivement un capteur (20, 22) de pression, qui relève, dans le conduit pour du fluide en amont du dispositif (18) fluidique respectif, une grandeur de système sous la forme de la pression (p, p') du fluide,
    - un dispositif (24) d'évaluation, qui est agencé de manière à ce que celui-ci détermine l'état de l'unité (8) de refoulement, en fonction d'au moins la une grandeur (p, p') de système,
    - un autre dispositif (18) fluidique, qui subdivise le conduit pour du fluide en une partie (12) de conduit pour du fluide communiquant avec l'unité (8) de refoulement et en une autre partie (14) du conduit pour du fluide et qui est agencé en ce qu'il autorise, en particulier à partir d'un seuil de pression pouvant être donné à l'avance, un acheminement de la pression du fluide de la une partie (12) de conduit pour du fluide à l'autre partie (14) de conduit pour du fluide et le bloque dans le sens contraire, et
    - une sonde (34) de température, qui relève, comme autre grandeur de système, une température (T), entrant dans la détermination de l'état du fluide passant dans l'unité (8) de refoulement.
  2. Installation suivant la revendication 1, caractérisée en ce qu'un dispositif fluidique est constitué sous la forme d'un agencement de consommateur pouvant fonctionner à une pression (pNenn ) nominale.
  3. Installation suivant la revendication 1 ou 2, caractérisée en ce que l'autre dispositif (18) fluidique est constitué sous la forme d'un clapet (28) antiretour, qui s'ouvre loin de l'unité (8) de refoulement en direction d'un raccord (A) de consommateur.
  4. Installation suivant l'une des revendications précédentes, caractérisée en ce qu'il est prévu supplémentairement au moins l'un des composants suivants :
    - un dispositif (30), qui détermine une vitesse (n) de refoulement de l'unité (8) de refoulement, qui entre comme autre grandeur de système dans la détermination de l'état ; et
    - un accumulateur (36) hydraulique raccordé à l'autre conduit (14) pour du fluide.
  5. Procédé de détermination d'un état sous la forme d'un état d'usure d'une unité (8) de refoulement en utilisant une installation suivant les revendications précédentes, comprenant les stades de procédé suivants :
    - établissement d'une pression (p, p') de fluide dans un conduit (12, 14) pour du fluide en amont d'au moins un dispositif (18) fluidique communiquant fluidiquement avec le conduit pour du fluide, dans lequel le conduit (12, 14) fluidique est raccordé à un côté haute pression de l'unité (8) de refoulement,
    - relevé d'une grandeur de système sous la forme de la pression (p, p') du fluide respective dans le conduit (12, 14) pour du fluide en amont du dispositif (18) fluidique respectif,
    - détermination de l'état de l'unité (8) de refoulement en fonction de la au moins une grandeur (p, p') de système, et en ce que
    - pour la détermination de l'état de l'unité (8) de refoulement on détermine au moins un point de fonctionnement de l'unité (8) de refoulement caractéristique de l'état où le courant (Qth ) théorique en volume de l'unité (8) de refoulement correspond à ses pertes (QLeck ) volumétriques.
  6. Procédé suivant la revendication 5, caractérisé en ce que l'on détermine l'état en outre en fonction de l'une des autres grandeurs de système suivantes :
    - une vitesse (n) de rotation de l'unité (8) de refoulement ; et
    - une température (T) du fluide passant dans l'unité (8) de refoulement.
  7. Procédé suivant la revendication 5 ou 6, caractérisé en ce que, pour la détermination de l'état de l'unité (8) de refoulement, on compare la une grandeur (n, p, p', T) du système à au moins une grandeur de système de référence correspondante et/ou on détermine, en fonction de la au moins une grandeur (n, p, p', T) de système, un paramètre (λ), en particulier de l'unité (8) de refoulement, que l'on compare à au moins un paramètre de référence correspondant, dans lequel, sur la base du résultat de cette comparaison (60) finale respective, on constate l'état de l'unité (8) de refoulement.
  8. Procédé suivant l'une des revendications 5 à 7, caractérisé en ce que, pour la détermination du point de fonctionnement, on effectue au moins l'une des modifications suivantes pendant un laps de temps :
    - on modifie la vitesse (n) de rotation de l'unité (8) de refoulement, et
    - on modifie une pression nominale (pNenn ) ou de charge d'un dispositif fluidique constitué en agencement de consommateur.
  9. Procédé suivant l'une des revendications 5 à 8, caractérisé en ce que, pendant que s'effectue l'opération respective de modification, on détermine au moins en partie une courbe (pV ) d'au moins une pression (p, p') respective du fluide ou une courbe (ṗV, ΔpRV,V ), qui en dépend et, en l'utilisant, on localise une modification significative de cette courbe (pV ) de la pression (p, p') du fluide, qui caractérise le point de fonctionnement.
  10. Procédé suivant l'une des revendications 5 à 9, caractérisé en ce que la courbe (ṗV, ΔpRV,V ), qui dépend d'au moins une pression (p, p') du fluide respective, décrit la variation (pV ) en fonction du temps d'au moins une pression (p, p') de fluide respective ou la différence (ΔpRV,V ) de pression entre une autre pression (p') du fluide, qui est relevée au moyen d'un autre capteur (22) de pression dans une autre partie (12) du conduit pour du fluide, et une pression (p) du fluide, qui est relevée au moyen d'un capteur (20) de pression dans une partie (20) du conduit pour du fluide.
  11. Procédé suivant l'une des revendications 5 à 10, caractérisé en ce que, pour la localisation de la modification significative de la courbe, on compare la courbe (pV , ṗV, ΔpRV,V ) déterminée au moins en partie en effectuant une comparaison (48) à au moins une valeur de référence correspondante.
  12. Procédé suivant l'une des revendications 5 à 11, caractérisée en ce que, pour la comparaison (60) finale, on utilise la grandeur (nDAD, pDAD, TDAD ) de système présente respective au point de fonctionnement.
  13. Procédé suivant l'une des revendications 5 à 12, caractérisé en ce que, pour la détermination de l'état de l'unité (8) de refoulement, on prescrit à la vitesse (n) de rotation de l'unité (8) refoulement constante que l'on détermine par la pression (p, p') du fluide respective, qui dépend de la vitesse (n) de rotation, et on compare la pression (p, p') du fluide déterminée ou un paramètre, qui en dépend, en particulier de l'unité (8) de refoulement, à au moins une valeur de référence correspondante.
EP23164766.0A 2022-04-16 2023-03-28 Dispositif et procédé de détermination d'un état, en particulier d'un état d'usure, d'une unité de déplacement Active EP4261413B1 (fr)

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DE102005059564A1 (de) 2005-12-13 2007-06-14 Brueninghaus Hydromatik Gmbh Vorrichtung und Verfahren zur Zustandsüberwachung bei hydrostatischen Verdrängereinheiten
DE102011075870B4 (de) 2011-05-16 2025-05-15 Robert Bosch Gmbh Verfahren zum Bewerten der Funktionsfähigkeit eines Kraftstoffeinspritzsystems einer Brennkraftmaschine
DE102011115650B4 (de) 2011-09-28 2022-03-03 Robert Bosch Gmbh Verfahren zur Diagnose des Zustandes einer hydrostatischen Verdrängermaschine und hydraulische Anordnung mit hydrostatischer Verdrängermaschine
DE102013211345B4 (de) 2013-06-18 2022-12-01 Robert Bosch Gmbh Verfahren zur Zustandsüberwachung an Verdrängereinheiten
DE102015206403B4 (de) * 2015-04-10 2026-04-23 Robert Bosch Gmbh Hydraulische Anordnung und Verfahren zur Leckagemessung für eine hydraulische Anordnung
AT521016B1 (de) 2018-08-24 2019-10-15 Engel Austria Gmbh Verfahren und Vorrichtung zur Zustandsüberwachung einer Hydraulikpumpe
DE102020112660A1 (de) 2020-05-11 2021-11-11 MOOG Gesellschaft mit beschränkter Haftung Verfahren zum Bestimmen eines momentanen Verschleißzustandes einer hydrostatischen Maschine
DE102020127285B3 (de) * 2020-10-16 2022-01-20 K.H. Brinkmann GmbH & Co Kommanditgesellschaft Verfahren zur Feststellung von Leckagen einer Verdrängerpumpe
DE102020007053A1 (de) 2020-11-19 2022-05-19 Hydac Fluidtechnik Gmbh Prüfvorrichtung

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