US20150240812A1 - Method for conveying hydraulic fluid, and electrohydraulic motor-pump unit therefor - Google Patents

Method for conveying hydraulic fluid, and electrohydraulic motor-pump unit therefor Download PDF

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Publication number
US20150240812A1
US20150240812A1 US14/633,410 US201514633410A US2015240812A1 US 20150240812 A1 US20150240812 A1 US 20150240812A1 US 201514633410 A US201514633410 A US 201514633410A US 2015240812 A1 US2015240812 A1 US 2015240812A1
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United States
Prior art keywords
hydraulic
pulsation
motor
electric motor
pump unit
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.)
Abandoned
Application number
US14/633,410
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English (en)
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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Filing date
Publication date
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Assigned to RAUSCH & PAUSCH GMBH reassignment RAUSCH & PAUSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KEMNITZ, ROCCO
Publication of US20150240812A1 publication Critical patent/US20150240812A1/en
Assigned to RAUSCH & PAUSCH GMBH reassignment RAUSCH & PAUSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HUDEC, JULIUS
Assigned to RAPA AUTOMOTIVE GMBH & CO. KG reassignment RAPA AUTOMOTIVE GMBH & CO. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RAUSCH & PAUSCH GMBH
Abandoned legal-status Critical Current

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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, unsteadily conveying displacement pump or, more precisely, a method for smoothing a pulsation of the hydraulic fluid arising in the hydraulic system due to the unsteady conveyance.
  • the invention relates furthermore to an electrohydraulic motor-pump unit for employment in the method according to the invention.
  • electrohydraulic motor-pump unit refers to a system consisting of a hydraulic displacement unit, an electric motor and an appurtenant electrical control device.
  • Such motor-pump units are frequently designated “power packs” colloquially. They serve for converting electrical energy to hydraulic energy and find use in numerous areas of application, such as the automobile sector, in mobile work machines or also quite generally in the industrial sector.
  • the unsteadiness of the hydraulic fluid conveyance is due to the fact that, depending on their design, the displacement pumps have one or more pump chambers which successively first draw in hydraulic fluid from the suction side and subsequently discharge it on the pressure side.
  • a pressure pulse is generated in the hydraulic system with every stroke.
  • gear pumps a number of pressure pulses corresponding to the number of pump gear teeth is generated in the hydraulic system with every rotation of the pump gear.
  • the pulsation frequency thus depends on the speed at which the displacement pump is operated, that is, on its “conveying frequency”, i.e. the frequency per time unit at which the displacement pump draws in and discharges hydraulic fluid by means of its pump chamber or pump chambers.
  • the conveying frequency is generally regular, but this is by no means necessary.
  • the object of the present invention is to provide an alternative for smoothing the pressure pulsation in a hydraulic system that occurs due to the unsteady conveyance by means of displacement pumps.
  • a method for conveying hydraulic fluid in a hydraulic system by means of an electrically driven, unsteadily conveying displacement pump provides for smoothing the pulsation of the hydraulic fluid arising in the hydraulic system due to the unsteady conveyance by suitably modulating the drive torque or the rotating speed of the electrical drive in accordance with the conveying frequency of the displacement pump.
  • pulsation parameter characterizing the pulsation for example i.e. the pressure pulsation in the hydraulic system
  • the drive torque of the electrical drive for driving the displacement pump can be modulated in accordance with said captured pulsation parameter.
  • the pressure pulsation in the hydraulic system is used as a hydraulic parameter, it is advantageous to capture the pressure on 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.
  • a pressure sensor preferably on the pressure side.
  • the captured pulsation parameter serves as the input variable for the control device of the electric motor for balancing out the pulsation, after the captured pulsation parameter has been resolved into a signal processable by the control device. Since said input variable reacts upon the input variable again via the control device of the electric motor and via the displacement pump driven by means of the electric motor, the overall result is a feedback control system.
  • a pulsation parameter instead of the pressure pulsation or the volume flow pulsation, a pulsation or vibration of the drive torque of the electric motor itself.
  • the pulsation caused by the unsteadily conveying displacement pump generates an associated torque pulsation on the drive shaft of the displacement pump.
  • said torque pulsation of the drive shaft can be captured and used for modulating the drive torque of the electric motor for driving the displacement pump.
  • an accordingly fast-reacting electrical control device of the electric motor is required.
  • Suitable for such extremely fast cycle times in electronics are for example circuits with so-called field programmable gate arrays (FPGAs). Further, when selecting the electric motor one should make sure the model has sufficient dynamics.
  • An electrohydraulic motor-pump unit suitable for the hereinabove described method accordingly comprises an unsteadily conveying displacement pump for conveying hydraulic fluid in a hydraulic system, an electric motor coupled with the displacement pump for driving the displacement pump, and an electrical control device coupled with the electric motor for controlling the electric motor, wherein the displacement pump, the electric motor and the control device are preferably housed in a common housing block having hydraulic connections which are arranged for coupling the motor-pump unit to a hydraulic system.
  • the housing block can furthermore advantageously comprise a hydraulic fluid tank for the hydraulic system.
  • the electrohydraulic motor-pump unit additionally has, as part of the electrical control device, a modulator for modulating the drive torque of the electric motor in accordance with the conveying frequency of the displacement pump, wherein preferably furthermore a detector for capturing one of the hereinabove described pulsation parameters is provided and the modulator is arranged for modulating the drive torque of the electric motor on the basis of the captured pulsation parameter.
  • the capturing of a pulsation parameter and modulating of the drive torque on the basis of the captured pulsation parameter is by no means necessary for smoothing the pulsation.
  • a smoothing is already obtained when the modulation of the drive torque in accordance with the conveying frequency of the displacement pump is firmly preset on the basis of values derived from experience.
  • the pulsation also depends on properties of the hydraulic system, in particular the elasticity of the hydraulic system, so that a completely feedback-controlled system with consideration of current pulsation parameters is advantageous.
  • a firm presetting of a drive-torque modulation dependent on the conveying frequency of the displacement pump can already lead to satisfactory results. For purposes of optimization it is also possible to adapt said firm presetting later, or to only set it when the motor-pump unit is connected to the hydraulic system for which it is intended.
  • FIG. 1 a realistic representation of an electrohydraulic motor-pump unit according to a first exemplary embodiment of the invention on a 1:1 scale
  • FIG. 2 a schematic and idealized representation of the time course of the hydraulic pressure of the drive torque and of the motor speed in a hydraulic system with and without pulsation compensation
  • FIG. 3 a realistic representation of an electrohydraulic motor-pump unit according to a second exemplary embodiment of the invention on a 1:1 scale
  • FIG. 4 a realistic representation of an electrohydraulic motor-pump unit with an integrated hydraulic tank on a 1:2 scale.
  • FIG. 1 shows a first exemplary embodiment of an electrohydraulic motor-pump unit, wherein a displacement pump 1 , an electric motor 2 and an electrical control device 3 are housed in a common housing block.
  • the displacement pump 1 possesses two hydraulic connections 4 for connecting the motor-pump unit to the suction side and the pressure side of a hydraulic system. Further hydraulic connections can be provided.
  • a pressure sensor 5 is so disposed on the hydraulic pump 1 that the pressure on the pressure-side hydraulic connection 4 can be measured therewith.
  • the sensor signal supplied by the pressure sensor 5 is fed to the electronic control device 3 .
  • the sensor signal is processed in the electronic control device 3 and employed for modulating the drive torque of the electric motor in accordance with the conveying frequency of the displacement pump such that it is constant if possible. As a result this also leads to the rotating speed of the electric motor being modulated.
  • the pressure relations in the hydraulic system can be changed, and through suitable change pressure fluctuations can be compensated. Since the pressure sensor 5 captures pressure fluctuations directly on the hydraulic connection 4 and since the pressure fluctuations occurring on the hydraulic connection originate substantially solely from the unsteady conveyance of the hydraulic fluid by means of the displacement pump, the described setup of the motor-pump unit according to FIG. 1 enables pressure pulsations in the hydraulic system to be smoothed through suitable modulation of the drive torque or of the rotating speed of the electric motor.
  • FIG. 2 shows schematically over the time t the course of the pressure p in the hydraulic system and the course of the drive torque M on the drive shaft of the electrical drive in comparison to the course of the rotating speed (U/min, or rpm) of the electrical drive.
  • the course without pressure compensation control is represented therein in dash lines with p 0 , M 0 and U 0 /min, while the course with compensation control is respectively represented as a continuous line.
  • the pressure p 0 in the hydraulic system and the drive torque of the electrical drive respectively fluctuate around an average p M and M M , while the motor speed remains constant at an average rotational speed U M /min.
  • the drive torque M or the rotating speed of the electric motor is so modulated that the electric motor conveys more volume per time unit in order to raise the lower system pressure p 0 to the average pressure p M , and at a higher system pressure p 0 vice versa.
  • FIG. 3 shows a second exemplary embodiment of an electrohydraulic motor-pump unit.
  • a different pulsation parameter is used for modulating the drive torque or the rotating speed of the electric motor 2 , i.e. the drive torque M 0 of the electric motor 2 is utilized as a basis for the modulation instead of the hydraulic pressure p 0 in the hydraulic system. That is to say, by means of an evaluation circuit of the electrical control device 3 it is monitored to what extent the drive torque M 0 of the electric motor 2 pulsates due to the unsteadily conveying displacement pump 1 , and this pulsation parameter serves in the electrical control device 3 for regulating the drive torque or the rotating speed of the electric motor 2 such that all drive torque fluctuations are compensated if possible.
  • This technical solution is the least elaborate constructively and leads to a smoothing of the pressure pulsation in the hydraulic system in a simple manner, because all pressure pulsation in the hydraulic system reacts upon the torque Mo present on the electric motor 2 .
  • FIG. 4 shows a motor-pump unit, having a hydraulic displacement unit 1 , an electric motor 2 and an integrated hydraulic tank 7 , as is preferably employed in a hydraulic system.
  • the hydraulic lines are marked as 8 .
  • the electrical control device 3 is not clearly recognizable here, but is part of the electric motor 2 .
US14/633,410 2014-02-27 2015-02-27 Method for conveying hydraulic fluid, and electrohydraulic motor-pump unit therefor Abandoned US20150240812A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014102591.1 2014-02-27
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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EP (1) EP2913526B1 (de)
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US20180038395A1 (en) * 2016-08-05 2018-02-08 Rausch & Pausch Gmbh Electro-hydraulic machine with integrated sensor
CN111379682A (zh) * 2018-12-29 2020-07-07 韦伯斯特生物官能(以色列)有限公司 一次性双作用往复式泵组件
US10954935B2 (en) 2016-04-19 2021-03-23 ClearMotion, Inc. Active hydraulic ripple cancellation methods and systems
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
CN116127652A (zh) * 2023-04-10 2023-05-16 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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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

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US10954935B2 (en) 2016-04-19 2021-03-23 ClearMotion, Inc. Active hydraulic ripple cancellation methods and systems
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CN111379682A (zh) * 2018-12-29 2020-07-07 韦伯斯特生物官能(以色列)有限公司 一次性双作用往复式泵组件
CN116127652A (zh) * 2023-04-10 2023-05-16 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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EP2913526A1 (de) 2015-09-02
DE102014102591A1 (de) 2015-08-27

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