DE102019122694A1 - Hydraulic system - Google Patents
Hydraulic system Download PDFInfo
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- DE102019122694A1 DE102019122694A1 DE102019122694.5A DE102019122694A DE102019122694A1 DE 102019122694 A1 DE102019122694 A1 DE 102019122694A1 DE 102019122694 A DE102019122694 A DE 102019122694A DE 102019122694 A1 DE102019122694 A1 DE 102019122694A1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0021—Generation or control of line pressure
- F16H61/0025—Supply of control fluid; Pumps therefore
- F16H61/0031—Supply of control fluid; Pumps therefore using auxiliary pumps, e.g. pump driven by a different power source than the engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20507—Type of prime mover
- F15B2211/20515—Electric motor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20576—Systems with pumps with multiple pumps
- F15B2211/20592—Combinations of pumps for supplying high and low pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/255—Flow control functions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/26—Power control functions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/265—Control of multiple pressure sources
- F15B2211/2658—Control of multiple pressure sources by control of the prime movers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
- F15B2211/31523—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member
- F15B2211/31535—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member having multiple pressure sources and a single output member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
- F15B2211/40507—Flow control characterised by the type of flow control means or valve with constant throttles or orifices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
- F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/41—Flow control characterised by the positions of the valve element
- F15B2211/411—Flow control characterised by the positions of the valve element the positions being discrete
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/42—Flow control characterised by the type of actuation
- F15B2211/426—Flow control characterised by the type of actuation electrically or electronically
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/61—Secondary circuits
- F15B2211/611—Diverting circuits, e.g. for cooling or filtering
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/615—Filtering means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
- F15B2211/6306—Electronic controllers using input signals representing a pressure
- F15B2211/6309—Electronic controllers using input signals representing a pressure the pressure being a pressure source supply pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
- F15B2211/632—Electronic controllers using input signals representing a flow rate
- F15B2211/6323—Electronic controllers using input signals representing a flow rate the flow rate being a pressure source flow rate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/665—Methods of control using electronic components
- F15B2211/6651—Control of the prime mover, e.g. control of the output torque or rotational speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/665—Methods of control using electronic components
- F15B2211/6653—Pressure control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/665—Methods of control using electronic components
- F15B2211/6654—Flow rate control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/665—Methods of control using electronic components
- F15B2211/6655—Power control, e.g. combined pressure and flow rate control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/88—Control measures for saving energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/0021—Generation or control of line pressure
- F16H2061/0037—Generation or control of line pressure characterised by controlled fluid supply to lubrication circuits of the gearing
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
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- Fluid-Pressure Circuits (AREA)
Abstract
Die vorliegende Anmeldung betrifft ein Hydrauliksystem (1) mit einer ersten und einer zweiten elektromotorisch angetriebenen Hydraulikpumpe (2, 3), wobei die erste Hydraulikpumpe (2) eine erste Hydraulikleitung (5) mit einem hydraulischen Fluid (6) versorgt, das mit einem ersten Druck beaufschlagt ist, und die zweite Hydraulikpumpe (3) eine zweite Hydraulikleitung (10) mit dem hydraulischen Fluid (6) versorgt, das mit einem zweiten Druck beaufschlagt ist, wobei der erste Druck höher ist als der zweite Druck, wobei die erste und die zweite Hydraulikleitung (5, 10) über eine dritte Hydraulikleitung (13) verbunden sind, in der ein Drosselventil (14) sowie eine Einrichtung (15) zur Messung eines Volumenstroms angeordnet sind.The present application relates to a hydraulic system (1) with a first and a second electric motor-driven hydraulic pump (2, 3), the first hydraulic pump (2) supplying a first hydraulic line (5) with a hydraulic fluid (6) which is supplied with a first Pressure is applied, and the second hydraulic pump (3) supplies a second hydraulic line (10) with the hydraulic fluid (6), which is subjected to a second pressure, the first pressure being higher than the second pressure, the first and the second hydraulic line (5, 10) are connected via a third hydraulic line (13) in which a throttle valve (14) and a device (15) for measuring a volume flow are arranged.
Description
Die vorliegende Erfindung betrifft ein Hydrauliksystem zur Vermeidung von Drosselverlusten.The present invention relates to a hydraulic system for avoiding throttle losses.
Durch die zunehmende Bedeutung der Energieeffizienz müssen in hydraulischen Systemen die Verluste minimiert werden. Dies erfordert nicht nur effiziente Komponenten, sondern auch Verschaltungen, die die erzeugte hydraulische Leistung bedarfsgerecht zur Verfügung stellen.Due to the increasing importance of energy efficiency, losses in hydraulic systems must be minimized. This not only requires efficient components, but also interconnections that make the generated hydraulic power available as required.
Werden in einem hydraulischen System mehrere Verbraucher, die jeweils unterschiedliche und variierende Arbeitsdrücke benötigen, mit einem Volumenstrom versorgt, so treten Verluste durch Drosselung des Systemdrucks auf den jeweiligen Arbeitsdruck am Verbraucher und durch Drosselung des überschüssigen Volumenstromes von einem Systemdruckniveau auf ein Tankdruckniveau oder auf ein zweites niedrigeres Druckniveau auf.If several consumers, each requiring different and varying working pressures, are supplied with a volume flow in a hydraulic system, losses occur due to throttling of the system pressure to the respective working pressure at the consumer and due to throttling of the excess volume flow from one system pressure level to a tank pressure level or to a second lower pressure level.
Zur Reduzierung der Verluste sind aus dem Stand der Technik sogenannte „Load Sensing“-Systeme bekannt. So offenbart beispielsweise die
Die höchste Effizienz kann jedoch erreicht werden, wenn die Maßnahmen zur Reduzierung der Systemverluste auf das jeweilige konkrete Hydrauliksystem unter Berücksichtigung der Anforderungen der Verbraucher angepasst werden. So schwankt beispielsweise der Volumenstrombedarf von Verbrauchern im Hochdruckbereich sehr stark, so dass systembedingt häufig mehr Volumenstrom im Hochdruckbereich zur Verfügung gestellt wird als benötigt. Dieser überschüssige Volumenstrom wird typischerweise über ein Drosselventil in den Niederdruckbereich abgedrosselt, was mit Verlusten hydraulischer Leistung und Erzeugung von Wärme verbunden ist. Die Neuerung sucht diesen Mangel abzuhelfen.However, the highest efficiency can be achieved if the measures to reduce the system losses are adapted to the respective specific hydraulic system, taking into account the requirements of the consumers. For example, the volume flow requirement of consumers in the high pressure range fluctuates very strongly, so that, due to the system, often more volume flow is made available in the high pressure range than is required. This excess volume flow is typically throttled into the low-pressure range via a throttle valve, which is associated with losses of hydraulic power and generation of heat. The innovation seeks to remedy this deficiency.
Der vorliegenden Erfindung liegt daher die Aufgabe zu Grunde, ein verbessertes Hydrauliksystem zur Vermeidung von Drosselverlusten bereitzustellen.The present invention is therefore based on the object of providing an improved hydraulic system for avoiding throttle losses.
Erfindungsgemäß wird die Aufgabe durch ein Hydrauliksystem mit den Merkmalen des Patentanspruchs 1 gelöst.According to the invention, the object is achieved by a hydraulic system with the features of claim 1.
Die Unteransprüche betreffen jeweils bevorzugte Ausgestaltungen bzw. Weiterbildungen der vorliegenden Erfindung, deren jeweilige Merkmale im Rahmen des technisch Sinnvollen frei miteinander kombinierbar sind.The subclaims each relate to preferred configurations or further developments of the present invention, the respective features of which can be freely combined with one another within the scope of what is technically reasonable.
Das erfindungsgemäße Hydrauliksystem umfasst eine erste und eine zweite elektromotorisch angetriebene Hydraulikpumpe, wobei die erste Hydraulikpumpe eine erste Hydraulikleitung mit einem hydraulischen Fluid versorgt, das mit einem ersten Druck beaufschlagt ist, und die zweite Hydraulikpumpe eine zweite Hydraulikleitung mit dem hydraulischen Fluid versorgt, das mit einem zweiten Druck beaufschlagt ist. Dabei ist der erste Druck höher als der zweite Druck, so dass über die erste Hydraulikleitung Abnehmer in einem Hochdruckbereich und über die zweite Hydraulikleitung Abnehmer in einem Niederdruckbereich mit dem hydraulischen Fluid versorgbar sind. Die erste und die zweite Hydraulikleitung sind weiterhin über eine dritte Hydraulikleitung miteinander verbunden, in der ein Drosselventil, vorzugsweise ein schaltbares Drosselventil, sowie eine Einrichtung zur Messung eines Volumenstroms angeordnet ist.The hydraulic system according to the invention comprises a first and a second electric motor-driven hydraulic pump, wherein the first hydraulic pump supplies a first hydraulic line with a hydraulic fluid that is subjected to a first pressure, and the second hydraulic pump supplies a second hydraulic line with the hydraulic fluid, which is supplied with a second pressure is applied. The first pressure is higher than the second pressure, so that consumers in a high pressure area can be supplied via the first hydraulic line and consumers in a low pressure area can be supplied with the hydraulic fluid via the second hydraulic line. The first and second hydraulic lines are also connected to one another via a third hydraulic line, in which a throttle valve, preferably a switchable throttle valve, and a device for measuring a volume flow are arranged.
Der vorliegenden Erfindung liegt die wesentliche Erkenntnis zugrunde, dass über die Einrichtung zur Messung des Volumenstroms in der hydraulischen Leitung, die den Hochdruckbereich des Hydrauliksystems mit dem Niederdruckbereich des Hydrauliksystems verbindet, der Volumenstrom erfassbar und als Signal einer Motorsteuerung zur Verfügung gestellt werden kann, so das die Leistung der elektromotorisch angetriebenen Hydraulikpumpe entsprechend dem aktuellen Bedarf anpassbar ist. Drosselverluste können somit wirkungsvoll reduziert werden. Durch Vermeidung einer Umwandlung von hydraulischer Energie in Wärme kann gleichzeitig die Energieeffizienz gesteigert werden.The present invention is based on the essential knowledge that via the device for measuring the volume flow in the hydraulic line, which connects the high pressure area of the hydraulic system with the low pressure area of the hydraulic system, the volume flow can be recorded and made available as a signal to an engine controller the output of the hydraulic pump driven by an electric motor can be adjusted according to current requirements. Throttle losses can thus be effectively reduced. By avoiding the conversion of hydraulic energy into heat, the energy efficiency can be increased at the same time.
Vorzugsweise umfasst die Einrichtung zur Messung des Volumenstroms eine in der dritten Hydraulikleitung angeordnete Messblende sowie einen in einer ersten Bypass-Leitung angeordneten Differenzdrucksensor. So kann die Messung des Volumenstroms über eine Druckdifferenzmessung an der Messblende erfolgen, die nach der allgemeinen Blendengleichung zum Volumenstrom korreliert. Wird beispielsweise der Druckabfall an dieser Messblende zu groß, so erhält die Motorsteuerung diese Information und kann sie für die Einstellung einer geeigneten Pumpendrehzahl berücksichtigen.The device for measuring the volume flow preferably comprises a measuring orifice arranged in the third hydraulic line and a differential pressure sensor arranged in a first bypass line. The volume flow can be measured using a pressure differential measurement at the measuring orifice, which correlates to the volume flow according to the general orifice equation. If, for example, the pressure drop at this measuring orifice becomes too great, the motor control receives this information and can take it into account for setting a suitable pump speed.
In einer besonders bevorzugten Ausführungsvariante umfasst die Einrichtung, ergänzend zu der in der dritten Hydraulikleitung angeordneten Messblende und dem in der ersten Bypass-Leitung angeordneten Differenzdrucksensor, weiterhin ein in einer zweiten Bypass-Leitung angeordnetes Druckventil, das bei zu hohem Differenzdruck öffnet und einen zur Messblende parallelen Volumenstrom ermöglicht. Dies hat den Vorteil, dass bei einem kurzzeitig hohen Kühlölvolumenstrom der Widerstand an der Einrichtung zur Messung des Volumenstroms begrenzt werden kann und somit die Drosselverluste in diesem Betriebspunkt reduziert werden.In a particularly preferred embodiment variant, the device, in addition to the measuring orifice arranged in the third hydraulic line and the differential pressure sensor arranged in the first bypass line, further comprises a pressure valve arranged in a second bypass line, which opens when the differential pressure is too high and one to the measuring orifice enables parallel volume flow. This has the advantage that, in the case of a briefly high volume flow of cooling oil, the resistance at the device for measuring the volume flow can be limited and thus the throttle losses at this operating point are reduced.
Vorzugsweise ist über die erste Hydraulikleitung eine Kupplung aktuierbar. Alternativ sind über die erste Hydraulikleitung Scheibensätze eines CVT-Getriebes anpressbar und/oder verstellbar. Über die zweite Hydraulikleitung sind vorzugsweise Getriebekomponenten kühl- und/oder schmierbar.A clutch can preferably be actuated via the first hydraulic line. Alternatively, sets of disks of a CVT transmission can be pressed on and / or adjusted via the first hydraulic line. Transmission components can preferably be cooled and / or lubricated via the second hydraulic line.
Grundsätzlich ist das erfindungsgemäße Hydrauliksystem auch für andere hydraulischen Systeme geeignet, in denen ein Hochdruck- und ein Niederdruckbereich existiert und ein überschüssiger Volumenstrom vom Hochdruck- in den Niederdruckbereich abgedrosselt wird.In principle, the hydraulic system according to the invention is also suitable for other hydraulic systems in which there is a high pressure and a low pressure area and an excess volume flow is throttled from the high pressure area to the low pressure area.
Weitere Vorteile und Merkmale des erfindungsgemäßen Hydrauliksystems ergeben sich aus den nachfolgenden Ausführungsbeispielen, die anhand von Zeichnungen näher erläutert werden. In dieser zeigen:
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1 ein Hydraulikschema einer ersten Ausführungsvariante des erfindungsgemäßen Hydrauliksystems, und -
2 ein Hydraulikschema einer zweiten Ausführungsvariante des erfindungsgemäßen Hydrauliksystems.
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1 a hydraulic scheme of a first embodiment of the hydraulic system according to the invention, and -
2 a hydraulic scheme of a second embodiment of the hydraulic system according to the invention.
Es wird darauf hingewiesen, dass die Figuren lediglich schematischer Natur sind und ausschließlich dem Verständnis der Erfindung dienen. Die gleichen Elemente sind mit denselben Bezugszeichen versehen. Auch sind die unterschiedlichen Merkmale der verschiedenen Ausführungsbeispiele prinzipiell frei miteinander kombinierbar.It should be noted that the figures are only of a schematic nature and serve exclusively for understanding the invention. The same elements are provided with the same reference symbols. In principle, the different features of the various exemplary embodiments can also be freely combined with one another.
In
Das Hydrauliksystem
Die erste Hydraulikleitung
Wie anhand von
Die Messung des Volumenstroms erfolgt über eine Druckdifferenzmessung an der Messblende
Wie aus der
In der zweiten Hydraulikleitung
BezugszeichenlisteList of reference symbols
- 11
- HydrauliksystemHydraulic system
- 22
- erste Hydraulikpumpefirst hydraulic pump
- 33
- zweite Hydraulikpumpesecond hydraulic pump
- 44th
- ElektromotorElectric motor
- 55
- erste Hydraulikleitungfirst hydraulic line
- 66th
- hydraulisches Fluidhydraulic fluid
- 77th
- Reservoirreservoir
- 88th
- ZuführleitungFeed line
- 99
- FiltereinheitFilter unit
- 1010
- zweite Hydraulikleitungsecond hydraulic line
- 1111
- zweite Zuführleitungsecond feed line
- 1212
- Abnehmercustomer
- 1313
- dritte Hydraulikleitungthird hydraulic line
- 1414th
- DrosselventilThrottle valve
- 1515th
- EinrichtungFacility
- 1616
- MessblendeOrifice plate
- 1717th
- erste Bypass-Leitungfirst bypass line
- 1818th
- DifferenzdrucksensorDifferential pressure sensor
- 1919th
- federbelastetes Rückschlagventilspring-loaded check valve
- 2020th
- Bypass-LeitungBypass line
- 2121st
- FiltereinheitFilter unit
- 2222nd
- KühleinheitCooling unit
- 2323
- Bypass-LeitungBypass line
- 2424
- federbelastetes Rückschlagventilspring-loaded check valve
- 2525th
- zweite Bypass-Leitungsecond bypass line
- 2626th
- DruckventilPressure valve
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDED IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturPatent literature cited
- DE 202011101545 U1 [0004]DE 202011101545 U1 [0004]
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019122694.5A DE102019122694A1 (en) | 2019-08-23 | 2019-08-23 | Hydraulic system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019122694.5A DE102019122694A1 (en) | 2019-08-23 | 2019-08-23 | Hydraulic system |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102019122694A1 true DE102019122694A1 (en) | 2021-02-25 |
Family
ID=74495893
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102019122694.5A Pending DE102019122694A1 (en) | 2019-08-23 | 2019-08-23 | Hydraulic system |
Country Status (1)
Country | Link |
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DE (1) | DE102019122694A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20230340969A1 (en) * | 2020-07-21 | 2023-10-26 | Schaeffler Technologies AG & Co. KG | Hydraulic system and method for operating a hydraulic system |
US11982296B2 (en) * | 2020-07-21 | 2024-05-14 | Schaeffler Technologies AG & Co. KG | Hydraulic system and method for operating a hydraulic system |
-
2019
- 2019-08-23 DE DE102019122694.5A patent/DE102019122694A1/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20230340969A1 (en) * | 2020-07-21 | 2023-10-26 | Schaeffler Technologies AG & Co. KG | Hydraulic system and method for operating a hydraulic system |
US11982296B2 (en) * | 2020-07-21 | 2024-05-14 | Schaeffler Technologies AG & Co. KG | Hydraulic system and method for operating a hydraulic system |
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