WO2012045387A1 - Unité électrohydraulique - Google Patents

Unité électrohydraulique Download PDF

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Publication number
WO2012045387A1
WO2012045387A1 PCT/EP2011/004563 EP2011004563W WO2012045387A1 WO 2012045387 A1 WO2012045387 A1 WO 2012045387A1 EP 2011004563 W EP2011004563 W EP 2011004563W WO 2012045387 A1 WO2012045387 A1 WO 2012045387A1
Authority
WO
WIPO (PCT)
Prior art keywords
hydraulic pump
electric motor
unit
electrohydraulic
unit according
Prior art date
Application number
PCT/EP2011/004563
Other languages
German (de)
English (en)
Inventor
Thomas Gellner
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2012045387A1 publication Critical patent/WO2012045387A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • 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

Definitions

  • the invention relates to an electro-hydraulic unit according to the preamble of claim 1.
  • Such an electro-hydraulic unit has an electric motor, via which a hydraulic pump is driven, and has the task of supplying a hydraulic consumer with pressure medium. As a rule, this must be done against a variable or load-influenced load.
  • the hydraulic pump is coupled to a shaft of the electric motor.
  • the pumped by the hydraulic pump pressure medium flow can be adjusted depending on the design of the hydraulic pump on their rotation or their stroke rate or stroke frequency.
  • a rotary working hydraulic pump for example an axial piston pump
  • this is the speed of the drive shaft.
  • a translationally operating hydraulic pump for example a translatory and cyclically operating hydraulic cylinder, it is the stroke rate of its piston.
  • the speed or the number of strokes result from the speed of the electric motor.
  • Electro-hydraulic unit is often referred to as a variable-speed pump unit (dvP).
  • dvP variable-speed pump unit
  • Particularly simple designed electro-hydraulic units have a
  • Constant pump so that the pressure medium flow is adjusted substantially via the speed of the hydraulic pump or the electric motor.
  • the disadvantage of this is that the determination unit is arranged with high device, in particular shielding technical effort on or in the electric motor.
  • the invention is based on the object to provide a more cost-effective determination of the pressure medium flow influencing speed.
  • the Consumer with a pressure medium or a pressure medium flow has an electric motor, via which a hydraulic pump is driven. Furthermore, the electro-hydraulic unit has a determination unit, via which an actual value of a rotational speed or a stroke rate of the hydraulic pump can be determined. About a control unit of the electro-hydraulic unit, the electric motor in dependence of the actual value can be regulated. According to the invention
  • the inventive assignment to the hydraulic pump has the advantage that the determination unit comparatively far from an electric or
  • Electrohydraulic units according to the invention are therefore comparatively inexpensive.
  • the electric-hydraulic unit according to the invention is thus designed as a variable-speed pump unit (dvP) in which a regulation of the pressure medium flow in the
  • Assigning the determination unit to the hydraulic pump causes a Aufregelzeit the hydraulic pump is shortened until a control deviation of the pressure medium flow, so that the pressure medium flow rate of the hydraulic pump is highly dynamically controlled.
  • the speed or stroke rate can be determined for rotary hydraulic pumps in “revolutions per unit time”, for translationally operating hydraulic pumps in “strokes per unit time”.
  • a control of the electric motor via a closed-loop, the control unit adjusts the actual value of the rotation or stroke rate with a setpoint.
  • control unit can receive further actual values of other process variables of the electrohydraulic unit or of the supplied hydraulic consumer, such as a position of an actuator or hydraulic cylinder, a pressure or a pressure medium flow, in order to obtain the setpoint value of the rotary or stroke number Determine stroke rate of the hydraulic pump.
  • the desired value can additionally or alternatively also be determined by a secondary or higher-order control unit.
  • the setpoint can be selected by an operator via a
  • Manual interface of the control unit be manually specified.
  • the determination unit has a
  • Magnetic field sensor and an at least partially magnetizable encoder so that the number of revolutions or strokes can be determined by utilizing a "Hall effect.” It is particularly advantageous that the rotational or stroke rate can be determined without contact via such a sensor.
  • the magnetic field sensor is fixed to the housing on or in a housing of the hydraulic pump while maintaining a proper distance and a proper orientation relative to the encoder.
  • the sensor and the encoder are at least partially disposed within the housing, so that relevant for the determination of the sections
  • the encoder preferably has a non-magnetizable section or a
  • the encoder is designed as a gear and connected to a rotating part of the hydraulic pump, so that the speed can be determined via the sensor.
  • the type of rotating part depends on a type of pump and may for example be a shaft, a cylinder drum, an impeller or an internal or external gear or an associated part.
  • the encoder may be formed as a rack and is connected to an approximately linearly moving part of the hydraulic pump, so that the stroke rate can be determined via the sensor.
  • the type of linearly moving part depends on the type of pump and can, for example, a piston or a
  • the gear or the rack has a modulus of greater than 0.3 in order to allow sufficient measurement accuracy.
  • the encoder is designed as a stamped sheet and thus made very cheap.
  • Determining unit a DSM speed sensor of the applicant, due to its robustness and degree of protection especially for use within the housing of the
  • Hydraulic pump is suitable. It is also advantageous that a rotational or lifting direction and a standstill can be determined via this sensor. In a preferred development, a speed of the electric motor can be regulated via the control unit.
  • the hydraulic pump is a fixed displacement pump, so that the pressure medium flow of the hydraulic pump via the rotational speed of the electric motor and thus the hydraulic pump is set.
  • the inventive determination of the speed of the hydraulic pump is particularly advantageous. If the hydraulic pump is coupled to the electric motor via a gear, it is possible to lower or translate a rotational speed of the electric motor.
  • An electro-hydraulic unit has a hydraulic pump driven by an electric motor, in particular a constant-displacement pump, and a
  • Determination unit which has a Hall sensor with a sensor.
  • Determination unit is an actual value of a speed of the hydraulic pump determinable. Furthermore, the electro-hydraulic unit has a control unit via the one speed of
  • Electric motor in response to the actual value of the speed of the hydraulic pump and a setpoint is adjustable.
  • the Hall sensor and the encoder are arranged on a part associated with the hydraulic pump.
  • Figure 1 shows a conventional electro-hydraulic unit with a determination unit within a housing of an electric motor
  • Figure 2 shows an embodiment of an electro-hydraulic unit according to the invention with a determination unit within a housing of the hydraulic pump.
  • Figure 1 shows a conventional electro-hydraulic unit 1 with a
  • the electro-hydraulic unit 1 has a drive controller 2 which is connected via a signal line 4 to the electric motor 6.
  • the electric motor 6 is coupled via a shaft 8 with a hydraulic pump 10.
  • the hydraulic pump 10 is connected to a suction line 12, via which a pressure medium at a low pressure can be sucked. Furthermore, the hydraulic pump 10 is connected to a pressure line 14 via which the pressure medium to a hydraulic consumer (not shown) against a load or a
  • Load pressure can be conveyed.
  • the determination unit 16 is arranged within the housing 18 of the electric motor 6 and carefully shielded from an electric and magnetic field of the electric motor 6.
  • Determination unit 16 via a signal line 20 connected to the drive controller 2. Via the signal line 20, the specific actual value of the rotational speed is transferred to the drive controller 2. In the drive control unit 2, an adjustment of the actual value takes place with a desired value of the rotational speed and via control parameters a determination of a manipulated variable for adaptation of a drive power of the electric motor 6 takes place.
  • FIG. 2 shows an electrohydraulic unit 101 according to the invention with a housing 18 arranged inside a constant-axial piston pump 10
  • the electro-hydraulic unit 101 has a drive controller 102, which has a
  • Signal line 104 is connected to an asynchronous electric motor 06. This is non-rotatably coupled to the constant-axial piston pump 110 via a drive shaft 108.
  • the constant-axial piston pump 10 is connected to a suction line 112, via which a pressure medium at a low pressure can be sucked.
  • the constant-axial piston pump 1 10 is connected to a pressure line 1 14, via which the pressure medium to a hydraulic consumer (not shown) against a load or a load pressure can be conveyed.
  • Determination unit 1 16 is arranged, which works on the basis of the "Hall" effect Hall sensor 1 16a and a Hall sensor 1 16b.
  • the Hall sensor 1 16b is designed as a DSM speed sensor of the series 10 of the applicant.
  • the Hall sender 1 16a is formed as a ferromagnetic gear with 48 teeth with a module of 1, which is stamped from a 6mm thick St37 sheet.
  • Hall sensor 1 16b has IP69K protection so that it is protected against dust, access by wire and high-pressure water. Its temperature resistance is given in a temperature interval between -40 ° C and 150 ° C.
  • the Hall sensor 1 16b is attached via a clip (not shown) in a simple manner to the housing 1 18 of the constant-axial piston pump 10 and arranged relative to the Hall generator 116a so that a longitudinal axis of the Hall sensor 116b with a maximum deviation of 2 ° normal on a Partial circle of the gear cutting circular cylindrical surface is arranged.
  • Trained as a DSM speed sensor determination unit 1 16 has the following self-diagnostic functions: a standstill detection and detection of a wrong arrangement of the Hall sensor 1 16b relative to the Hall sender 1 16a.
  • a rotational speed of the constant-axial piston pump 110 can be determined.
  • the determination unit 1 16 is shielded via the housing 1 18 of the constant-axial piston 110 against an electrical and magnetic field of the electric motor 106.
  • the determination unit 1 16 is connected to the transfer of the specific actual value of the speed of the constant-axial piston pump 1 10 to the drive controller 102 via a signal line 120 with this.
  • the drive controller 102 the adjustment of the actual value with a nominal value of the rotational speed and control parameter via a determination of a manipulated variable for adapting a drive power of the asynchronous electric motor 106th
  • the setpoint value can be transferred via a manual operator interface (not shown) by an operator via a signal line 122 to the control unit 102 be and / or by a secondary or higher-level control unit (not shown) in dependence on actual values of process and / or operating parameters of the
  • the design of the hydraulic pump of the electro-hydraulic unit is not limited to the shown constant-axial piston pump 1 10 in swash plate design. It can be used as a rotary hydraulic pump, for example as an external or internal gear,
  • the hydraulic pump may be adjustable or constant.
  • an electro-hydraulic unit with a driven by an electric motor hydraulic pump and with a determination unit, via which an actual value of a speed or a stroke rate of the hydraulic pump can be determined, and with a control unit via which the electric motor in dependence of the actual value can be controlled.
  • the determination unit is assigned to the hydraulic pump.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

L'invention concerne une unité électrohydraulique avec une pompe hydraulique entraînée par un moteur électrique, et avec une unité de détermination qui permet de déterminer une valeur instantanée d'une vitesse de rotation ou d'une cadence de la pompe hydraulique, ainsi qu'avec une unité de régulation qui permet de réguler le moteur électrique en fonction de la valeur instantanée. Selon l'invention, l'unité de détermination est associée à la pompe hydraulique.
PCT/EP2011/004563 2010-10-09 2011-09-10 Unité électrohydraulique WO2012045387A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010048111.4A DE102010048111B4 (de) 2010-10-09 2010-10-09 Elektrohydraulische Einheit
DE102010048111.4 2010-10-09

Publications (1)

Publication Number Publication Date
WO2012045387A1 true WO2012045387A1 (fr) 2012-04-12

Family

ID=44651643

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/004563 WO2012045387A1 (fr) 2010-10-09 2011-09-10 Unité électrohydraulique

Country Status (3)

Country Link
DE (1) DE102010048111B4 (fr)
TW (1) TWI611102B (fr)
WO (1) WO2012045387A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19953170A1 (de) * 1999-11-04 2001-05-17 Brueninghaus Hydromatik Gmbh Leistungsregelvorrichtung und Ventilblock für eine Leistungsregelvorrichtung
DE102005051482A1 (de) * 2005-10-27 2007-05-03 Brueninghaus Hydromatik Gmbh Lastdruckgeführter Förderstromregler mit Schwingungsdämpfung
DE102008063924A1 (de) * 2007-12-21 2009-06-25 Robert Bosch Gmbh Verfahren zur Erkennung von Fehlern und Zuordnung zu Fehlerursachen in einem hydrostatischen System und entsprechendes Steuergerät
DE102008063927A1 (de) * 2007-12-21 2009-06-25 Robert Bosch Gmbh Verfahren zur Bestimmung von Lastkollektiven von hydrostatischen Maschinen sowie entsprechendes Steuergerät

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2117629U (zh) * 1992-04-10 1992-09-30 四川通达机电技术开发公司 自动调速无极变速器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19953170A1 (de) * 1999-11-04 2001-05-17 Brueninghaus Hydromatik Gmbh Leistungsregelvorrichtung und Ventilblock für eine Leistungsregelvorrichtung
DE102005051482A1 (de) * 2005-10-27 2007-05-03 Brueninghaus Hydromatik Gmbh Lastdruckgeführter Förderstromregler mit Schwingungsdämpfung
DE102008063924A1 (de) * 2007-12-21 2009-06-25 Robert Bosch Gmbh Verfahren zur Erkennung von Fehlern und Zuordnung zu Fehlerursachen in einem hydrostatischen System und entsprechendes Steuergerät
DE102008063927A1 (de) * 2007-12-21 2009-06-25 Robert Bosch Gmbh Verfahren zur Bestimmung von Lastkollektiven von hydrostatischen Maschinen sowie entsprechendes Steuergerät

Also Published As

Publication number Publication date
DE102010048111A1 (de) 2012-04-12
DE102010048111B4 (de) 2019-08-01
TWI611102B (zh) 2018-01-11
TW201241314A (en) 2012-10-16

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