EP1065379A2 - Elektrohydraulische Druckversorgung mit verstellbarer Pumpe und regelbarem elektrischem Antrieb - Google Patents
Elektrohydraulische Druckversorgung mit verstellbarer Pumpe und regelbarem elektrischem Antrieb Download PDFInfo
- Publication number
- EP1065379A2 EP1065379A2 EP00110414A EP00110414A EP1065379A2 EP 1065379 A2 EP1065379 A2 EP 1065379A2 EP 00110414 A EP00110414 A EP 00110414A EP 00110414 A EP00110414 A EP 00110414A EP 1065379 A2 EP1065379 A2 EP 1065379A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- adjustment
- pressure
- speed
- control
- 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
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- 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
- F04B2205/07—Pressure difference over the pump
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- 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
- F04B2205/09—Flow through the pump
Definitions
- the invention relates to a device according to the preamble of the independent claim.
- Electrohydraulic pressure supplies have found a variety of applications. They are used in electrohydraulic control devices, in hydraulic ones Lifting and lowering loads, when operating hydraulic actuators and not most recently in automotive hydraulics. In automotive hydraulics have electro-hydraulic Pressure supplies e.g. Used in power steering and in electro-hydraulic actuated actuators. To control the volume flow delivered by the hydraulic pump So far, three different principles have been followed.
- the delivery rate is one with an electric motor driven hydraulic pump controlled by regulating the speed of the electric motor becomes.
- the electric motor is operatively connected to the hydraulic pump and the volume flow delivered by the hydraulic pump depends on the speed of the electric drive motor.
- the hydraulic pump itself has except through the Speed of the drive via no control systems with which the delivered volume flow can be influenced.
- the drive motor must be able to both Process large volume flows with small load side system pressures as well small volume flows with high load-side system pressures.
- the volume flow promoted is proportional to the speed of the drive motor, while the load-side system pressure is proportional the torque applied by the engine. This leads to the drive motors in these electrohydraulic systems both on high speed and on a high torque must be designed. This makes the electric drive motors complex and expensive.
- electro-hydraulic systems have been proposed in which the electric drive is operated at constant speed. This enables the optimization of the electric motor towards a speed. Because the electric motor is the most complex component of electrohydraulic Systems can be optimized by optimizing the electric motor constant speed towards cost advantages.
- the required volume flow of the hydraulic pump is set by regulating a by-pass valve. This principle of regulation assumes that the pump constantly delivers at least the set volume flow. Since the Target volume flow must also be made available if there is no hydraulic power these systems have a relatively high unused power loss.
- the power that can be drawn from the electrical system is electrical Pump drive limited. That is why higher performance is required for hydraulic pumps mechanical drives used e.g. via a belt drive or chain drive to the Internal combustion engine of the motor vehicle are coupled. The drive speed of the pump is thereby coupled to the speed of the internal combustion engine and not controllable independently.
- the volume flow delivered is regulated by means of an adjustment of the swallowing volume of the connected hydrate pump. Depending on one System pressure controls the absorption volume of the pump.
- a disadvantage of these Systems is that the volume flow conveyed depends on the speed of the internal combustion engine depends. Because the necessary system pressure even at low engine speeds In these systems, pumps must be provided relatively large maximum swallowing volume can be used.
- the internal combustion engine must have the swallowing volume as small as possible can be set, otherwise the system pressure will rise to unpredictably high values would. Therefore, in these systems, the swallowing volume of the pump must be over one relatively large range adjustable, resulting in large mechanical designs for the variable displacement pumps leads.
- the object of the invention is therefore to provide an electrohydraulic pressure supply with an adjustable one Specify pump and variable speed drive, which is both optimization of the electric drive as well as the optimization of the adjustable pump with regard to Allows minimizing the necessary component sizes.
- the invention consists in the interaction of two independently adjustable Energy converter and that through a speed-adjustable electric motor, which is a variable displacement pump drives and a variable displacement pump with variable absorption volume.
- the electric motor converts electrical power consisting of voltage U and current I (lossy) into mechanical Power in speed n and torque T um.
- the pump is changing (also lossy) convert this mechanical power into hydraulic power.
- the hydraulic Power is determined by the pressure difference ⁇ p and the volume flow Q. Die Pressure difference ⁇ p is usually impressed on the system by the consumer.
- the volume flow Q results from the swallowing volume and the engine speed n.
- the torque T that the motor has to apply results from the swallowing volume V and Pressure difference ⁇ p.
- the swallowing volume V determines the distribution of the power to the engine speed n and the torque T.
- the current I flowing in the electric motor is predominantly by determines the torque T, the voltage U is mainly determined by the engine speed n influenced. Size and electrical losses in the electric motor are essentially determined by the maximum torque T required by the motor, ie by the current I.
- the conveyed volume flow of the electrohydraulic pressure supply is in the essentially set via the speed adjustment of the regulated electric motor.
- the speed of the electric drive motor is largely independent of that Adjustable pump suction volume. Largely independent means that for the Setting the speed and the swallowing volume only the specified time currently required target volume flows and reference pressures must be observed.
- the speed of the drive motor can be completely independent within these two system specifications of the displacement volume of the variable pump. This allows the Displacement volume adjustment of the variable pump can be pressure controlled and by the Adjustment of the swallowing volume changed delivery capacity of the pump by the independent Speed control of the electric motor can be compensated.
- the acquisition of the volume flow can both directly via a volume flow measuring device and indirectly from the reaction of the working machine, e.g. from the travel range of the connected Actuator. This makes it possible to use the variable displacement pump as a device for influencing the torque e.g. to operate as a torque controller for the electric motor.
- the hydraulic power is determined by the pressure difference ⁇ p and the volume flow Q.
- the volume flow Q is influenced by the engine speed n of the engine and by the displacement volume V of the variable pump.
- the combination delivers a variable speed drive motor with a variable displacement pump V two degrees of freedom to influence hydraulic performance. This enables with Advantage, the power consumption by the electric motor to the required hydraulic Adapt performance. The destruction of work done in by-pass lines thereby advantageously avoided.
- Another advantage of the combination according to the invention is the fact that the required Differential pressure ⁇ p largely independent of the torque T of the electric motor can be.
- the speed n together with the set swallowing volume V of the variable pump influences the differential pressure ⁇ p.
- This is used to advantage to limit the maximum torque T that the electric motor must provide. It is more advantageous to have an electric motor with high speed and low torque run to deliver the same power as a low speed electric motor and let great torque run. That determines with engines Torque the component size and thus the cost of the system.
- the variable displacement pump used as a device for influencing torque e.g. enabled as a torque controller with advantage a torque limitation and thus a smaller drive motor that is optimal and operated with little loss.
- Another advantage of the combination of speed-controlled drive according to the invention and variable displacement pump is that such an electrohydraulic Pressure supply with unchanged power consumption both high pressure differences ⁇ p at small volume flows Q as well as large volume flows Q with small pressure differences Can produce ⁇ p.
- examples of such operating states are highly dynamic Adjustment movements and on the other hand holding functions under load. Such operating states occur in motor vehicles e.g. with active chassis, electro-hydraulic brakes and steering on. Electrohydraulic actuators for these systems can be used with the invention Pressure supply works more economically and is built smaller, lighter and cheaper become.
- FIG. 1 shows a schematic illustration of an electrohydraulic pressure supply according to the invention.
- An electric motor M is operatively connected as a drive motor to a variable displacement pump 1.
- the speed n of the electric motor M can be regulated by a regulator Reg.
- a change in the speed of the electric motor is transmitted to the variable displacement pump 1 via the operative connection 2.
- the control Reg processed as input variables to a predetermined value Q for the required target flow rate and a measured value Q is for the respectively actually conveyed current flow rate of the variable displacement pump.
- the current volume flow is determined using a device Q for determining the delivered volume flow.
- the determination of the current volume flow can be carried out directly with a volume flow sensor, or determined indirectly from the reaction of the connected work machine.
- the connecting lines 3 end with the consumer connections 4.
- One or more hydraulic actuators and one or more hydraulic storage containers can be connected to the consumer connections 4 on the system side. Exemplary embodiments for the connection of an actuator are shown in FIGS. 2 to 9. Between the connections 4, the differential pressure ⁇ p between the delivery line and the suction line of the variable displacement pump is detected with a pressure measuring device. The differential pressure ⁇ p controls the displacement volume V of the variable pump depending on a reference pressure p Ref . For this purpose, the differential pressure ⁇ p and the reference pressure p Ref are entered into a control Strg. The control Strg controls the pump adjustment PV, which is in operative connection with the adjustment element 5 of the adjustment pump 1. A change of the absorption volume affects the delivered volume flow Q.
- the regulation Reg fits over the rotational speed n of the delivered volume flow Q is the required Q Volumnestrom intended to.
- the volume flow can also be determined by determining the travel of the adjusting element 5 and the working speed of the variable pump, for example the speed n.
- the pump operates below a limit torque defined by p Ref like a constant unit with a maximum absorption volume.
- the variation of the electric motor speed n modulates the volume flow (including reversing). If the limit torque is exceeded, the control reduces the absorption volume until the limit torque is applied as the load torque.
- the torque is measured indirectly via the motor current or the differential pressure ⁇ p.
- the requested volume flow Q should be made available with a reduced swallowing volume by increasing the engine speed.
- Fig. 2 shows a schematic diagram of an embodiment according to the invention for reversible Systems with a pump adjustment by an electrical actuator.
- a hydraulic actuator 6 and a pressure reservoir 7 are connected to the Pump connections 4, a hydraulic actuator 6 and a pressure reservoir 7 are connected.
- the adjusting member 5 of the variable pump 1 is equipped with an electric actuator 8 operated.
- the actuator is controlled by the control Ctrl.
- Fig. 3 shows a schematic diagram of an embodiment according to the invention for reversible Systems with a pump adjustment by a control piston with pressure control valve.
- a control piston 9 changes the position of the adjusting member 5 the pump 1.
- the control piston 9 is always connected to the pressure side, which guarantees a pressure-controlled 4/3-way valve 10.
- a spring 11 pivots the actuator 5 at 0 pressure maximum swallowing volume and delivers a path-proportional counterforce under pressure.
- an electrically controlled valve for pressure regulation 12 e.g. a pressure control valve, can at Pressurization, the piston force of the control piston 9 can be set.
- the control of the valve for pressure control 12 takes place via the control Ctrl. In connection with the Spring force of the piston spring 11 results in a piston position.
- Fig. 4 shows a schematic diagram of an embodiment according to the invention for reversible Systems with a pump adjustment by a control piston and an electric actuated 4-3-way valve.
- a differential spool changes 9 the position of the actuator 5 of the pump 1.
- An electrically controlled 4/3-way valve 13 ensures the pressurization of the respective piston surface of the differential control piston 9.
- the piston position is determined by the opening time of the 4/3-way valve 13 regulated.
- the middle position of the valve blocks the oil flow and fixes the piston in it Location.
- the valve is controlled via the control Ctrl.
- a pressure controlled 4/3-way valve 10 ensures the direction of the control pressure gradient. The dynamics of the adjustment depends on the height of the pressure drop.
- FIG. 5 shows a basic illustration of an exemplary embodiment according to the invention for reversible systems with a pump adjustment by means of a control piston with spring which is pressurized to the system.
- a control piston 9 changes the position of the actuator 5 of the pump 1.
- the control piston 9 is always connected to the pressure side via the connections 4 and the 4/3 way valve 10.
- a spring 11 pivots the actuator 5 to maximum absorption volume at 0 pressure and delivers a path-proportional counterforce under pressure.
- the path of the control piston is proportional to the pressure drop. If the spring 11 is installed with preload, the system only regulates when a limit pressure drop p ref is exceeded.
- the limit pressure drop p Ref is predetermined by the preload of the spring 11.
- the parallel connection of differently long and / or differently rigid springs 11 or the use of stepped pistons change the control characteristic of the control piston 9. Since the load torque is approximately pressure-proportional, the differential pressure ⁇ p between the two connections 4 can be used as a control variable.
- the advantage of this embodiment lies in its passive self-regulation by the spring 11. An active regulation of the control piston 9 by an active control can be dispensed with.
- FIG. 6 shows a basic illustration of an exemplary embodiment according to the invention for reversible systems with a pump adjustment by an electric actuator.
- this exemplary embodiment is the Pump 1 cannot be reversed.
- the Storage container 14 is not a pressure storage container, but only a pressureless storage container for the hydraulic fluid for actuating the hydraulic actuator 6.
- the adjusting member 5 of the pump 1 is actuated by the electrical actuator 8.
- the actuator 8 will controlled by the control Ctrl.
- FIG. 7 shows a basic illustration of an exemplary embodiment according to the invention for reversible systems with a pump adjustment by a control piston with pressure control valve.
- a control piston changes the position of the adjusting element as shown in Figure 11 Pump.
- the control piston 9 is connected to the pressure side of the pump 1 via the pump connection 4 connected.
- a spring 11 pivots the actuator 5 of the pump 1 to the maximum at 0 pressure Swallowing volume and provides a path-proportional counterforce under pressure.
- About an electric controlled valve for pressure regulation 12, e.g. a pressure control valve, can when pressurized the piston force can be adjusted.
- the valve is controlled via the Control Ctrl.
- the piston position results in connection with the spring force.
- FIG. 8 shows a basic illustration of an exemplary embodiment according to the invention for reversible systems with a pump adjustment by a control piston and an electric actuated 4-3-way valve.
- a differential changes Control piston 9, the position of the actuator 5 of the pump 1.
- An electrically controlled 4/3-way valve 13 ensures that the respective piston surface is pressurized.
- the piston position is regulated via the opening time of the valve 13.
- the middle position of the valve blocks the oil flow and fixes the piston in position.
- the valve is controlled via the control Ctrl.
- the dynamics of the adjustment depend on the height of the pressure drop between the two connections 4.
- a control piston 9 changes the position of the actuator 5 of the pump 1.
- the control piston 9 is connected to the pressure side of the pump 1.
- a spring 11 pivots the actuator 5 to maximum absorption volume at 0 pressure and delivers a path-proportional counterforce under pressure.
- the path of the control piston corresponds to the pressure drop. If the spring 11 is installed with preload, the system only regulates when a limit pressure drop p ref is exceeded. The limit pressure drop p Ref is predetermined by the preload of the spring 11.
- the parallel connection of differently long and / or differently stiff springs 11 or the use of stepped pistons in the control piston 9 change the control characteristic. Since the load torque is approximately pressure-proportional, the differential pressure ⁇ p between the two connections 4 can be used as a control variable.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Fluid-Pressure Circuits (AREA)
- Reciprocating Pumps (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
Description
- Fig.1
- Eine schematische Darstellung der erfindungsgemäßen Elektrohydraulischen Druckversorgung.
- Fig. 2
- Eine Prinzipdarstellung eines erfindungsgemäßen Ausführungsbeispiels für reversierbare Systeme mit einer Pumpenverstellung durch einen elektrischen Aktuator
- Fig. 3
- Eine Prinzipdarstellung eines erfindungsgemäßen Ausführungsbeispiels für reversierbare Systeme mit einer Pumpenverstellung durch einen Steuerkolben mit Druckregelventil
- Fig. 4
- Eine Prinzipdarstellung eines erfindungsgemäßen Ausführungsbeispiels für reversierbare Systeme mit einer Pumpenverstellung durch einen Steuerkolben und ein elektrisch betätigtes 4-3-Wege-Ventil
- Fig. 5
- Eine Prinzipdarstellung eines erfindungsgemäßen Ausführungsbeispiels für reversierbare Systeme mit einer Pumpenverstellung durch einen systemdruckbeaufschlagten Steuerkolben mit Feder
- Fig. 6
- Eine Prinzipdarstellung eines erfindungsgemäßen Ausführungsbeispiels für nicht reversierbare Systeme mit einer Pumpenverstellung durch einen elektrischen Aktuator
- Fig. 7
- Eine Prinzipdarstellung eines erfindungsgemäßen Ausführungsbeispiels für nicht reversierbare Systeme mit einer Pumpenverstellung durch einen Steuerkolben mit Druckregelventil
- Fig. 8
- Eine Prinzipdarstellung eines erfindungsgemäßen Ausführungsbeispiels für nicht reversierbare Systeme mit einer Pumpenverstellung durch einen Steuerkolben und elektrisch betätigtes 4-3-Wege-Ventil
- Fig. 9
- Eine Prinzipdarstellung eines erfindungsgemäßen Ausführungsbeispiels für nicht reversierbare Systeme mit einer Pumpenverstellung durch einen systemdruckbeaufschlagten Kolben mit Feder
Claims (11)
- Elektrohydraulische Druckversorgung mit einem drehzahlregelbaren elektrischen Antriebsmotor (M) und einer Verstellpumpe (1), deren Schluckvolumen (V) durch ein Verstellglied (5) veränderbar ist, mit Anschlußleitungen (3) und Verbraucheranschlüssen (4) umfassendeine Regelung (Reg) zur Drehzahlregelung des Antriebsmotors (M) und einer Einrichtung (Q) zur Bestimmung des geförderten Volumenstroms ( Qist), wobei die Regelung (Reg) mindestens den geförderten Volumenstrom (Qist ) und einen Sollvolumenstrom (Qsoll) als Eingangsgrößen hat,eine Pumpenverstellung (PV) zur Betätigung des Verstellgliedes (5) der Verstellpumpe (1) und einer Steuerung (Strg) zur Ansteuerung der Pumpenverstellung (PV) und einer Druckmeßeinrichtung (Δp) zur Bestimmung des Differenzdrucks (Δp), wobei die Steuerung (Strg) mindestens einen Referenzdruck (pRef) und den Differenzdruck (Δp) als Eingangsgrößen hat.
- Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Drehzahl (n) des Antriebsmotor (M) im wesentlichen unabhänhig von der Verstellung des Schluckvolumens (V) der Verstellpumpe (1) einstellbar ist.
- Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Verstellpumpe (1) als Einrichtung zur Drehmomentbeeinflussung für den Antriebsmotor (M) betreibbar ist.
- Vorrichtung nach einem der Ansprüche 1 bis 3 für reversierbare Systeme mit einem hydraulischen Aktor (6) und einem Druckvorratbehältet- (7), dadurch gekennzeichnet, daß die Pumpenverstellung (PV) ein elektrischer Aktuator (8) ist.
- Vorrichtung nach einem der Ansprüche 1 bis 3 für reversierbare Systeme mit einem hydraulischen Aktor (6) und einem Druckvorratbehälter (7), dadurch gekennzeichnet, daß die Pumpenverstellung (PV) aus einem Ventil zur Druckregelung (12), einem Steuerkolben (9) mit mindestens einer Feder (11) und einem hydraulisch betätigten 4-3-Wege-Ventil (10) besteht.
- Vorrichtung nach einem der Ansprüche 1 bis 3 für reversierbare Systeme mit einem hydraulischen Aktor (6) und einem Druckvorratbehälter (7), dadurch gekennzeichnet, daß die Pumpenverstellung (PV) aus einem Differentialsteuerkolben (9), einem hydraulisch betätigten 4-3-Wege-Ventil (10) und einem elektrisch betätigten 4-3-Wege-Ventil 13 besteht.
- Vorrichtung nach einem der Ansprüche 1 bis 3 für reversierbare Systeme mit einem hydraulischen Aktor (6) und einem Druckvorratbehälter (7), dadurch gekennzeichnet, daß die Pumpenverstellung (PV) aus einem Steuerkolben (9) mit mindestens einer Feder (11) und einem hydraulisch betätigten 4-3-Wegeventil (10) besteht.
- Vorrichtung nach einem der Ansprüche 1 bis 3 für nicht-reversierbare Syteme mit einem hydraulischen Aktor (6) und einem Vorratsbehälter (14), dadurch gekennzeichnet, daß die Pumpenverstellung (PV) ein elektrischer Aktuator (8) ist.
- Vorrichtung nach einem der Ansprüche 1 bis 3 für nicht-reversierbare Syteme mit einem hydraulischen Aktor (6) und einem Vorratsbehälter (14), dadurch gekennzeichnet, daß die Pumpenverstellung (PV) aus einem Ventil zur Druckregelung (12) und einem Steuerkolben (9) mit mindestens einer Feder (11) besteht.
- Vorrichtung nach einem der Ansprüche 1 bis 3 für nicht-reversierbare Syteme mit einem hydraulischen Aktor (6) und einem Vorratsbehälter (14), dadurch gekennzeichnet, daß die Pumpenverstellung (PV) aus einem Differentialsteuerkolben (9) und einem elektrisch betätigten 4-3-Wege-Ventil (13) besteht.
- Vorrichtung nach einem der Ansprüche 1 bis 3 für nicht-reversierbare Syteme mit einem hydraulischen Aktor (6) und einem Vorratsbehälter (14), dadurch gekennzeichnet, daß die Pumpenverstellung (PV) aus einem Steuerkolben (9) mit mindestens einer Feder (11) besteht.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19930648 | 1999-07-02 | ||
| DE19930648A DE19930648A1 (de) | 1999-07-02 | 1999-07-02 | Elektrohydraulische Druckversorgung mit verstellbarer Pumpe und regelbarem elektrischem Antrieb |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1065379A2 true EP1065379A2 (de) | 2001-01-03 |
| EP1065379A3 EP1065379A3 (de) | 2002-06-12 |
| EP1065379B1 EP1065379B1 (de) | 2004-03-10 |
Family
ID=7913492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00110414A Expired - Lifetime EP1065379B1 (de) | 1999-07-02 | 2000-05-16 | Elektrohydraulische Druckversorgung mit verstellbarer Pumpe und regelbarem elektrischem Antrieb |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6347516B1 (de) |
| EP (1) | EP1065379B1 (de) |
| JP (1) | JP2001041167A (de) |
| AT (1) | ATE261546T1 (de) |
| DE (2) | DE19930648A1 (de) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015144155A1 (de) * | 2014-03-24 | 2015-10-01 | Schaeffler Technologies AG & Co. KG | Antriebskoppelbarer aktor mit verstellpumpe |
| CN116161109A (zh) * | 2023-02-28 | 2023-05-26 | 中国重汽集团济南动力有限公司 | 一种转向泵控制策略实现方法、装置及存储介质 |
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| DE10158341B4 (de) * | 2000-12-07 | 2010-11-18 | Ixetic Bad Homburg Gmbh | Pumpe für Fahrwerksysteme |
| DE10104635A1 (de) * | 2001-02-02 | 2002-10-02 | Joma Hydromechanic Gmbh | Verfahren zum Aufrechterhalten einer konstanten Ausgangsgröße einer Förderpumpe, z.B. ihres Fördervolumens, die von einer in ihrer Drehzahl variablen Antriebsvorrichtung angetrieben wird, sowie Vorrichtung zur Durchführung des Verfahrens |
| DE10307190A1 (de) * | 2003-02-20 | 2004-09-16 | O & K Orenstein & Koppel Gmbh | Verfahren zur Steuerung eines Hydrauliksystems einer mobilen Arbeitsmaschine |
| DE102005023430A1 (de) * | 2005-03-15 | 2006-09-21 | Fresenius Medical Care Deutschland Gmbh | Verfahren und Vorrichtung zur Bestimmung der effektiven Förderrate oder Einstellung der Drehzahl einer peristaltischen Pumpe |
| DE102007007005B4 (de) | 2007-02-08 | 2021-12-02 | Robert Bosch Gmbh | Elektrohydraulische Steueranordnung |
| US20110176940A1 (en) * | 2008-07-08 | 2011-07-21 | Ellis Shawn D | High pressure intensifier system |
| DE102009021866A1 (de) * | 2009-05-19 | 2010-11-25 | Sauer-Danfoss Gmbh & Co Ohg | Hydroantrieb mit einer unabhängigen Speisepumpe |
| US9222575B2 (en) * | 2010-12-22 | 2015-12-29 | Gm Global Technology Operations, Llc | Electric pump |
| US9062665B2 (en) * | 2013-01-15 | 2015-06-23 | Husco International, Inc. | Hydraulic piston pump with throttle control |
| DE102013005774B4 (de) * | 2013-04-05 | 2021-01-21 | Robert Bosch Gmbh | Nutzung einer von einem motor angetriebenen drehzahlvariablen hydraulikpumpe als hydrostatisches getriebe |
| DE112014005946A5 (de) | 2013-12-18 | 2016-10-06 | Schaeffler Technologies AG & Co. KG | Verstellpumpe |
| DE102015209951A1 (de) * | 2015-05-29 | 2016-12-01 | Zf Friedrichshafen Ag | Ölfördersystem eines Kraftfahrzeugs |
| SE544986C2 (en) * | 2019-04-05 | 2023-02-21 | Epiroc Rock Drills Ab | Method and system for controlling operation of a hydraulic system of a drilling rig |
| CN112983798B (zh) * | 2021-03-25 | 2023-02-24 | 烟台杰瑞石油装备技术有限公司 | 应用于电驱压裂设备的控制方法及其控制装置 |
| DE102022203051B3 (de) | 2022-03-29 | 2023-10-12 | Robert Bosch Gesellschaft mit beschränkter Haftung | Verfahren zum Betreiben einer drehzahlvariablen Pumpe |
| DE102023203371A1 (de) * | 2023-04-13 | 2024-10-17 | Robert Bosch Gesellschaft mit beschränkter Haftung | Verfahren zur Verringerung von Leistungsverlusten in einem elektrohydraulischen System |
| US20250389260A1 (en) * | 2024-06-21 | 2025-12-25 | Hamilton Sundstrand Corporation | Pwm control of actuation pressure for variable-displacement hydraulic pumps |
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1999
- 1999-07-02 DE DE19930648A patent/DE19930648A1/de not_active Withdrawn
-
2000
- 2000-05-16 EP EP00110414A patent/EP1065379B1/de not_active Expired - Lifetime
- 2000-05-16 DE DE50005576T patent/DE50005576D1/de not_active Expired - Fee Related
- 2000-05-16 AT AT00110414T patent/ATE261546T1/de not_active IP Right Cessation
- 2000-06-29 JP JP2000196981A patent/JP2001041167A/ja active Pending
- 2000-06-30 US US09/607,963 patent/US6347516B1/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015144155A1 (de) * | 2014-03-24 | 2015-10-01 | Schaeffler Technologies AG & Co. KG | Antriebskoppelbarer aktor mit verstellpumpe |
| CN106104055A (zh) * | 2014-03-24 | 2016-11-09 | 舍弗勒技术股份两合公司 | 具有移位泵的能够驱动耦合的促动器 |
| CN116161109A (zh) * | 2023-02-28 | 2023-05-26 | 中国重汽集团济南动力有限公司 | 一种转向泵控制策略实现方法、装置及存储介质 |
| CN116161109B (zh) * | 2023-02-28 | 2024-06-11 | 中国重汽集团济南动力有限公司 | 一种转向泵控制策略实现方法、装置及存储介质 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1065379A3 (de) | 2002-06-12 |
| JP2001041167A (ja) | 2001-02-13 |
| ATE261546T1 (de) | 2004-03-15 |
| US6347516B1 (en) | 2002-02-19 |
| DE19930648A1 (de) | 2001-01-11 |
| DE50005576D1 (de) | 2004-04-15 |
| EP1065379B1 (de) | 2004-03-10 |
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