EP2913526A1 - Procédé de transport de fluide hydraulique et unité de pompe/moteur électrohydraulique associée - Google Patents

Procédé de transport de fluide hydraulique et unité de pompe/moteur électrohydraulique associée Download PDF

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Publication number
EP2913526A1
EP2913526A1 EP15153042.5A EP15153042A EP2913526A1 EP 2913526 A1 EP2913526 A1 EP 2913526A1 EP 15153042 A EP15153042 A EP 15153042A EP 2913526 A1 EP2913526 A1 EP 2913526A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
motor
pulsation
positive displacement
electric motor
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
EP15153042.5A
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German (de)
English (en)
Other versions
EP2913526B1 (fr
Inventor
Rocco Kemnitz
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.)
Rapa Automotive GmbH and Co KG
Original Assignee
Rausch and Pausch GmbH
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Application filed by Rausch and Pausch GmbH filed Critical Rausch and Pausch GmbH
Publication of EP2913526A1 publication Critical patent/EP2913526A1/fr
Application granted granted Critical
Publication of EP2913526B1 publication Critical patent/EP2913526B1/fr
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Classifications

    • 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
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/08—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the rotational speed
    • 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
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • 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
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0041—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation by piston speed control
    • 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
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
    • 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
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • 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
    • F04B3/00—Machines or pumps with pistons coacting within one cylinder, e.g. multi-stage
    • 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
    • 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
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/001—Pumps for particular liquids
    • F04C13/002—Pumps for particular liquids for homogeneous viscous liquids
    • 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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0042—Systems for the equilibration of forces acting on the machines or pump
    • F04C15/0049—Equalization of pressure pulses
    • 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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/008—Prime movers
    • 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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • 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
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0207—Torque
    • 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
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/008—Enclosed motor pump units
    • 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
    • F04C2270/03—Torque
    • F04C2270/035—Controlled or regulated
    • 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
    • F04C2270/05—Speed
    • F04C2270/052—Speed angular
    • F04C2270/0525—Controlled or regulated

Definitions

  • the present invention relates to a method for conveying hydraulic fluid in a hydraulic system by means of an electrically driven, unsupported positive displacement pump or, more precisely, a method for smoothing a due to the unsteady promotion resulting pulsation of the hydraulic fluid in the hydraulic system.
  • the invention further relates to an electro-hydraulic motor-pump unit for use in the method according to the invention.
  • Electro-hydraulic motor-pump units are systems which consist of a hydraulic displacement unit, an electric motor and an associated electrical drive device. Such motor-pump units are colloquially often referred to as a "power pack". They are used to convert electrical energy into hydraulic energy and are used in numerous fields of application, such as in the automotive sector, in mobile machines or, more generally, in the industrial sector.
  • the discontinuity of the hydraulic fluid delivery is due to the fact that the positive displacement pumps, depending on the design, have one or more pumping chambers, which successively first receive hydraulic fluid from the suction side and then eject it on the pressure side.
  • piston pumps generate a pressure pulse in the hydraulic system with each piston stroke.
  • gear pumps with each revolution of the impeller one of the number of impeller teeth corresponding Zarl generated by pressure pulses in the hydraulic system.
  • the pulsation frequency thus depends on the speed with which the positive displacement pump is operated, that is on its "frequency", namely the frequency per unit time with which the positive displacement pump receives or expels hydraulic fluid by means of its pumping chamber or pumping chambers.
  • the delivery frequency is usually regular, but that is by no means mandatory.
  • the pressure pulsation in the hydraulic fluid occurring as a result of the unsteady delivery volume leads to disadvantageous phenomena in the hydraulic system, in particular frequent disturbing noises as a result of excited vibrations.
  • Object of the present invention is to provide an alternative for smoothing the pressure pulsation in a hydraulic system, which occurs due to the unsteady promotion by means of positive displacement pumps.
  • a method according to the invention for conveying hydraulic fluid in a hydraulic system by means of an electrically driven, unsupported positive displacement pump smoothes the pulsation of the hydraulic fluid in the hydraulic system due to the unsteady delivery by smoothing the drive torque or the rotational speed of the electric drive according to the conveyor frequency
  • Positive displacement pump is suitably modulated.
  • a pulsation parameter characterizing the pulsation can advantageously be detected and used for the purposes of this modulation, for example the pressure pulsation in the hydraulic system, and the drive torque of the electric drive for driving the positive displacement pump can be adjusted accordingly be recorded pulsation parameter modulated.
  • the rotational speed of the electric drive can alternatively be modulated directly. Because even the modulation of the drive torque ultimately leads to nothing other than a corresponding change, d. H. Modulation, the rotational speed and therefore in each case to a temporal modulation of the delivery by the positive displacement pump.
  • the pressure pulsation in the hydraulic system is used as the hydraulic parameter, then it is advantageous to detect the pressure at one or more of the hydraulic connections of the motor-pump unit, for example by means of a pressure sensor, preferably on the pressure side.
  • the pulsation of the volume flow can also be detected, preferably again directly at one or more of the hydraulic connections of the motor-pump unit, and preferably again on the pressure side.
  • the detected pulsation parameter serves as an input variable for the control device of the electric motor for compensating the pulsation after the detected pulsation parameter has been resolved into a signal processable by the drive means. Since this input value reacts back to the input quantity via the control device of the electric motor and via the positive displacement pump driven by the electric motor, the overall result is a regulated system.
  • a pulsation or oscillation of the drive torque of the electric motor itself is used as the pulsation parameter instead of the pressure pulsation or the volume flow pulsation.
  • the pulsation produced by the unstable positive displacement pump generates an associated torque pulsation on the drive shaft of the positive displacement pump.
  • this torque pulsation of the drive shaft can be detected and used to modulate the drive torque of the electric motor for driving the positive displacement pump.
  • a correspondingly responsive electrical control device of the electric motor For the necessary modulation of the drive torque on the basis of such a pulsation parameter, a correspondingly responsive electrical control device of the electric motor is required.
  • circuits with so-called Field Programmable Gate Arrays (FPGAs) are suitable.
  • FPGAs Field Programmable Gate Arrays
  • An electrohydraulic motor-pump unit suitable for the above-described method accordingly comprises an unstable positive-displacement pump for conveying hydraulic fluid in a hydraulic system, a coupled to the positive displacement pump electric motor for driving the positive displacement pump and an electric motor coupled to the electric drive means for controlling the electric motor, wherein the positive displacement pump, the electric motor and the drive means preferably in a common housing block with hydraulic connections, for coupling the motor-pump unit a hydraulic system are arranged are housed.
  • the housing block may further advantageously comprise a hydraulic fluid tank for the hydraulic system.
  • the electro-hydraulic motor-pump unit additionally comprises, as part of the electrical drive device, a modulator for modulating the drive torque of the electric motor corresponding to the delivery frequency of the positive displacement pump, preferably further comprising a detector for detecting one of the above-described pulsation parameters and the modulator is set up, to modulate the drive torque of the electric motor based on the detected pulsation parameter.
  • the detection of a pulsation parameter and modulating the drive torque on the basis of the detected pulsation parameter is by no means mandatory in order to smooth the pulsation.
  • a smoothing is already achieved when the modulation of the drive torque according to the delivery frequency of the positive displacement pump based on empirical values is preset.
  • the pulsation also depends on properties of the hydraulic system, in particular the elasticity of the hydraulic system, so that a fully controlled system taking into account current pulsation parameters is advantageous. But a firm presetting of a dependent of the delivery frequency of the positive displacement pump modulation of the drive torque can already lead to satisfactory results.
  • this fixed preset adjust later or only set when the motor-pump unit is connected to the hydraulic system for which it is intended.
  • the advantages achieved by the invention are that the pressure pulsation on the hydraulic connections can be minimized until almost completely eliminated. On secondary measures for Pulsationsreduzi für in the hydraulic system can be omitted if necessary, so that, for example, assembly costs and / or costs can be reduced.
  • FIG. 1 shows a first embodiment of an electro-hydraulic motor-pump unit in which a positive displacement pump 1, an electric motor 2 and an electrical drive means 3 are housed in a common housing block.
  • the displacement pump 1 has two hydraulic ports 4 for connecting the motor-pump unit to the suction side and the pressure side of a hydraulic system. It can be provided more hydraulic connections.
  • displacement pumps come a variety of unsteady promotional hydraulic displacement units into consideration, such as the aforementioned internal gear pumps, external gear pumps, piston pumps or other pumps with successively pumping pumping chambers.
  • the type of electric motor is essentially not critical to the invention. It is crucial that the drive torque provided by the electric motor for the electric motor 1 or the rotational speed of the electric motor 1 are adjustable, because drive torque and rotational speed are directly related to each other. For adjusting or modulating the drive torque or the rotational speed of the electric motor 2, the electrical control device 3 is used.
  • a pressure sensor 5 is arranged on the hydraulic pump 1 so that the pressure at the pressure-side hydraulic port 4 can be measured with it. With reversing motor-pump units, it may be expedient to provide a further pressure sensor in a corresponding manner at the second hydraulic connection 4. Via a return line 6, the sensor signal provided by the pressure sensor 5 is supplied to the electronic control device 3. The sensor signal is processed in the electronic drive device 3 and used to drive torque to modulate the electric motor according to the delivery frequency of the positive displacement pump so that it is as constant as possible. As a result, this also leads to the fact that the rotational speed of the electric motor is modulated. By suitable modulation of the drive torque or the rotational speed of the electric motor, the pressure conditions in the hydraulic system can be changed and compensate for pressure fluctuations by appropriate change.
  • FIG. 2 shows schematically over the time t the course of the pressure p in the hydraulic system and the course of the driving torque M on the drive shaft of the electric drive compared to the course of the rotational speed (rpm) of the electric drive.
  • po, M 0 and Uo / min show the course without pressure compensation control in dashed lines, while the course with compensation control is shown in each case as a solid line.
  • U M / min actually varies by the mean value U M / min, but only slightly, because the engine alternately due to the unsteady delivery and the resulting volume flow pulsation against slightly higher and lower pressures in the hydraulic system promotes.
  • the drive torque M or the rotational speed of the electric motor is modulated so that the electric motor delivers more volume per unit time to the lower system pressure po to bring the mean pressure p M , and vice versa at a higher system pressure po.
  • FIG. 3 shows a second embodiment of an electro-hydraulic motor-pump unit.
  • another pulsation parameter is used to modulate the drive torque and the rotational speed of the electric motor 2, namely, instead of the hydraulic pressure po in the hydraulic system, the drive torque Mo of the electric motor 2 is used as the basis for the modulation. That is, it is monitored by means of an evaluation circuit of the electric control device 3, to what extent the drive torque Mo of the electric motor 2 due the discontinuously conveying positive displacement pump 1 pulses, and this pulsation parameter is used in the electrical control device 3 to regulate the drive torque or the rotational speed of the electric motor 2 so that any drive torque fluctuations are compensated as possible.
  • This technical solution is structurally the least expensive and leads in a simple manner to a smoothing of the pressure pulsation in the hydraulic system, because any pressure pulsation in the hydraulic system acts on the voltage applied to the electric motor 2 Mo torque.
  • FIG. 4 shows a motor-pump unit with hydraulic displacer unit 1, electric motor 2 and integrated hydraulic tank 7, as it is preferably used in a hydraulic system. With 8 the hydraulic lines are marked. The electrical control device 3 is not clearly visible here but part of the electric motor. 2
EP15153042.5A 2014-02-27 2015-01-29 Procédé de transport de fluide hydraulique et unité de pompe/moteur électrohydraulique associée Active EP2913526B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014102591.1A DE102014102591A1 (de) 2014-02-27 2014-02-27 Verfahren zum Fördern von Hydraulikfluid und elektrohydraulische Motor-Pumpen-Einheit dafür

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EP2913526A1 true EP2913526A1 (fr) 2015-09-02
EP2913526B1 EP2913526B1 (fr) 2020-04-22

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US (1) US20150240812A1 (fr)
EP (1) EP2913526B1 (fr)
DE (1) DE102014102591A1 (fr)

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DE102016106483B4 (de) * 2016-04-08 2019-02-07 Jenaer Antriebstechnik Gmbh Verfahren zur Kompensation von zyklischen Störungen beim Betrieb einer Pumpe sowie Regelungseinheit
EP3904681A3 (fr) 2016-04-19 2021-12-22 ClearMotion, Inc. Procédés et systèmes actifs de suppression des ondulations hydrauliques
US11480199B2 (en) 2016-06-02 2022-10-25 ClearMotion, Inc. Systems and methods for managing noise in compact high speed and high force hydraulic actuators
DE102016114540A1 (de) * 2016-08-05 2018-02-08 Eckerle Industrie-Elektronik Gmbh Elektrohydraulische Maschine mit integriertem Sensor
US11698059B2 (en) * 2018-12-29 2023-07-11 Biosense Webster (Israel) Ltd. Disposable dual-action reciprocating pump assembly
DE102020200118A1 (de) * 2020-01-08 2021-07-08 Volkswagen Aktiengesellschaft Verfahren zur Detektion eines kritischen Zustands bei einem Kältemittelkreislauf eines Fahrzeuges
CN112594150A (zh) * 2020-12-16 2021-04-02 中国地质大学（北京） 一种可远程控制的新型泥浆泵
CN116127652B (zh) * 2023-04-10 2023-06-27 浙江大学 一种内曲线液压马达的低脉动轴配流窗口设计方法及系统

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Publication number Publication date
EP2913526B1 (fr) 2020-04-22
US20150240812A1 (en) 2015-08-27
DE102014102591A1 (de) 2015-08-27

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