EP1356208B1 - Pump system comprising a hydraulic pump, particularly for a steering system - Google Patents

Pump system comprising a hydraulic pump, particularly for a steering system Download PDF

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Publication number
EP1356208B1
EP1356208B1 EP02716707A EP02716707A EP1356208B1 EP 1356208 B1 EP1356208 B1 EP 1356208B1 EP 02716707 A EP02716707 A EP 02716707A EP 02716707 A EP02716707 A EP 02716707A EP 1356208 B1 EP1356208 B1 EP 1356208B1
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EP
European Patent Office
Prior art keywords
pump
cam ring
actuator
rotor
electric motor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02716707A
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German (de)
French (fr)
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EP1356208A1 (en
Inventor
Ulrich Aldinger
Rolf Herkommer
Sven-Uwe Begerow
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.)
Robert Bosch Automotive Steering GmbH
Original Assignee
ZF Lenksysteme GmbH
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Publication date
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Publication of EP1356208A1 publication Critical patent/EP1356208A1/en
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Publication of EP1356208B1 publication Critical patent/EP1356208B1/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/18Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/22Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
    • F04C14/223Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam
    • F04C14/226Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam by pivoting the cam around an eccentric axis
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/06Control
    • F04B1/07Control by varying the relative eccentricity between two members, e.g. a cam and a drive shaft
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00Control, 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
    • F04B49/06Control using electricity
    • F04B49/065Control using electricity and making use of computers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/24Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/30Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C2/3441Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation

Definitions

  • the invention relates to a pump system with a hydraulic pump, in particular for a steering system, according to the preamble of claim 1.
  • Such a pump system is known from the document DE 34 20 519 A1, in which describes a radial piston pump that has a drivable rotor Includes radial bores in which pump pistons are arranged, which are located on the Inside of an encompassing cam ring, which is mounted eccentrically to the rotor support.
  • a plurality of the circumference evenly distributed pump pistons more depending on the current position of the pump pistons or less radially pressed into their receiving radial bore in the rotor.
  • the Pump pistons act on a fluid receiving space, depending on the position the pump piston sucks the fluid into or out of the receiving space is pushed out. In this way, an approximately constant fluid flow be promoted.
  • a electrohydraulic pressure regulator is provided, the one the position of the outside Includes adjusting piston adjusting cam ring, which in dependence on a Control voltage to be fed to a proportional magnet must be adjusted.
  • the invention is based on the problem of specifying a pump system that is precisely adjustable and is characterized by a good one Responsiveness with a simple construction distinguished.
  • the pump system should be variably hand-held have and during operation to different external load requirements to be set.
  • the pump system comprises a hydraulic one Pump for delivering hydraulic fluid to a consumer and on the other hand a control and / or regulating unit in which depending on measurement signals or other input signals Control signals can be generated, the actuator of the pump can be fed to adjust the pump output.
  • the rules and regulations Control unit advantageously forms a separate from the pump executed unit, in which condition and operating variables of the consumer to whom the hydraulic fluid is supplied as the working medium will be supplied as input signals. additionally or as an alternative to the status and operating parameters of the Consumers can also use appropriate sizes of a dynamic Systems are considered in which the consumer is embedded and within which the consumer forms a subsystem.
  • This pump system is particularly suitable for use in a steering system for steering the wheels in a motor vehicle, the steering system being the consumer who is supplied with hydraulic fluid by the hydraulic pump, and the motor vehicle represents the superordinate dynamic system, its condition is taken into account when setting the pump can be.
  • This pump system offers the advantage of high variability, since the pump power via the signals of the regulating and control unit immediately adjusted to the requirements of the consumer can be what especially when used in Steering systems in motor vehicles leads to parameterizable Pumps can be realized in the steering system, their performance of state and system variables such as vehicle speed, the steering angular velocity and / or the yaw rate can be adjusted. Another advantage is that in the event that the system is in a stationary or quasi stationary state, a comparatively small Energy consumption can be realized.
  • variable displacement pump is advantageously used as the pump as a vane pump, as a roller cell pump or as a radial piston pump is executed.
  • the variable displacement pump has one inside a cam ring rotatably mounted and motor driven Rotor with radial bores with radially movable ones and towards the inside of the cam ring supportable pump elements, which have a fluid receiving space apply, the relative position between the cam ring and rotor via the actuator between a concentric position and an eccentric position is to be adjusted.
  • the variation of the pump performance is carried out via the Control signals of the regulating and control unit through a Actuator caused adjustment of the relative position between Cam ring and rotor.
  • the position of the outer, encompassing the rotor is expedient Curve ring via an actuator designed as an electric motor to adjust.
  • the electromotive adjustment of the outer Curve ring has the advantage that very short response times can be realized to the power output to the current To set the request. Response times up to about 10 ms can be realized.
  • the electric motor is very is precisely controllable and also small travel ranges, but with high forces go hand in hand, can be implemented. Possibly it can be useful here between the electric motor and to provide a reduction gear to the cam ring to the short travel distances and high positioning forces required to be able to realize relatively small electric motors.
  • the pump and the electric motor acting on the cam ring basically form functionally independent units, a higher degree of flexibility is achieved, which in particular it comes about that only the motion transmission from the rotor of the electric motor to the cam ring must be guaranteed; additional support elements on the cam ring however, are not absolutely necessary.
  • the power supply to the electric motor is also easier to accomplish as the hydraulic supply in known from the prior art hydraulic or electro-hydraulic control systems.
  • the rotor of the electric motor is used to adjust the position of the cam ring advantageously connected to an eccentric disc, which either immediately the required actuating movement from The rotor of the electric motor is transferred to the cam ring or indirectly via an intermediate transmission lever.
  • an indirect transmission is provided, is the intermediate Transmission lever is expediently translatory too move, the move being generated by one end of the transfer lever from a cam track on the eccentric disc is applied.
  • the indirect transmission under Interposition of the transmission lever offers the advantage that due to the spatial separation of pump and electric motor a variety of arrangement options of the electric motor are given relative to the pump.
  • the pump is useful via a closed control loop regulated, which is a sensor for measuring an actual size, the corresponds to the flow rate or pressure of the pump, and in addition, a control unit for comparing the Actual size with a stored or determined target value and the generation of one derived from the target-actual comparison Value for the electric current for the electric motor includes.
  • the sensor is advantageous as a position sensor designed to determine the position of the cam ring, which are used as a measure of the delivery pressure or flow can be because of the amount of deflection of the cam ring compared to a symmetry or center position in relation to the rotor the pump determines the pump output.
  • a magnetoresistive sensor can be used which measures the magnetic field of a permanent magnet, which on Rotor of the electric motor or one of these Component is arranged.
  • a vane pump 1 which a first delivery line 2 hydraulic fluid from a hydraulic reservoir 3 sucks in and via a second delivery line 4 pumps increased pressure to a consumer 5.
  • the consumer 5 is in particular a hydraulically actuated Steering system in a motor vehicle.
  • a return line 6 leading to the hydraulic reservoir 3 returns and in which a safety valve 7 is integrated which is in the open position when a maximum pressure is exceeded is displaced so that hydraulic fluid from the delivery line 4 via the return line 6 into the hydraulic reservoir 3 can flow back.
  • the safety valve 7 usually opens only at a maximum pressure, which is usually significantly higher is than the delivery pressure to be supplied to the consumer 5.
  • the vane pump 1 includes one in a not shown Housing rotatably mounted rotor 8 by a Curved ring 9 is encompassed.
  • the rotor 8 is driven by a drive unit driven, for example by an internal combustion engine.
  • the rotor 8 has evenly distributed over its circumference Radial guides 10 in which are formed as displacers 11 Pump elements are radially slidably received.
  • the displacers 11 are supported on the inside of the cam ring 9 from.
  • the radial guides 10 communicate with a fluid receiving space for the hydraulic fluid to be pumped, one Relative movement of the radial pistons 11 in the radial bores 10 generates a suction or delivery pressure, which the hydraulic fluid from the hydraulic reservoir 3 and in the direction of Consumer 5 promotes.
  • Pump 1 is a variable displacement pump with variable pump geometry educated. For this purpose, the position of the cam ring 9 relative to the rotor 8 continuously between a concentric Position and a maximum eccentric position in which the rotor 8 rests directly on an inside of the cam ring 9, be adjusted. The measure of the eccentric deflection of the cam ring 9 relative to the rotor 8 determines the delivery rate the radial piston pump 1.
  • the cam ring 9 is rotatably supported about a bearing point 12. On the side radially opposite the bearing point 12 engages an actuator 13 on the cam ring 9; that as an electric motor 14 is executed and its to be transferred to the cam ring 9 Adjustment movement in a swivel movement in the direction of the arrow 15 of the cam ring is implemented around its bearing point 12, whereby the curve ring is stepless between its concentric and the maximum eccentric position is adjusted.
  • the transfer the actuating movement of electric motor 14 on cam ring 9 expediently takes place via a transmission lever to be moved in translation 16, which is acted upon by the rotor of the electric motor is and tangentially engages the cam ring 9.
  • Control signals S Stell which are generated in a regulating and control unit 18, are fed to the electric motor 14 for adjustment via signal lines 17.
  • the control signals S Stell are generated according to a relationship stored in the regulating and control unit 18 as a map or as a calculation formula as a function of input signals S Ein , the status and operating variables of the pump 1, the consumer 5 and, if appropriate, other structural units, in particular an internal combustion engine, represent.
  • the power P to be supplied to the consumer can also be achieved by Change in the pressure p to be supplied to the consumer changes be, for example, by a variably adjustable Aperture in the delivery line 4 to the consumer.
  • FIG. 2 shows the radial piston pump 1 in an enlarged, schematic representation.
  • the rotor 19 of the electric motor 14 is connected to an eccentric disc 20 by the electric motor is driven in rotation.
  • On the peripheral surface of the eccentric disc 20 is the translationally displaceable transmission lever 16 on.
  • the peripheral surface of the eccentric disc 20 forms a curved path for the transmission lever 16 so that the current position of the transmission lever from the current one Rotational position of the eccentric disc 20 is determined. That of the eccentric disc 20 opposite end of the transmission lever 16 engages tangentially on the radially opposite bearing point 12 Side of the cam ring 9 and twists it in Arrow direction 15 around its bearing point 12.
  • FIG. 2 there are an intake opening 21 via which Supply hydraulic fluid from the hydraulic reservoir of the pump 1 and a pressure outlet opening 22, via which under pressure standing hydraulic fluid is to be supplied to the consumer.
  • an in Fig. 4 shown position sensor 24 is provided, which is advantageously magnetoresistive and with a permanent magnet 25 interacts, which is useful on the front the eccentric disc 20 is arranged.
  • the magnetoresistive Position sensor 24 is capable of that from the permanent magnet 25 generated magnetic field to measure. Because of the eccentric Arrangement of the eccentric disc 20 is from the position sensor 24 one from the current rotational position of the eccentric disc 20 dependent magnetic field senses from which to the rotating position can be closed. Since the eccentric disc 20 and Cam ring 9 are kinematically coupled, can be out of position the eccentric disc 20 also to the position of the cam ring 9 be inferred.
  • the position sensor 24 is advantageously stationary on a circuit board 26 held on which additional evaluation components 27 arranged to evaluate the measurement signals of the position sensor 24 are.
  • Fig. 4 can also be seen that on the electric motor 14 Reduction gear can be provided to the motor rotation of the electric motor in a smaller rotation, but with a higher one Torque to translate.
  • FIG. 5 shows a closed control loop, which is implemented in particular in a regulating and control unit 18, for adjusting the electric motor 14 and thus the cam ring of the pump and the delivery rate of the pump.
  • the current actual value of the eccentric disc or the cam ring or a value correlating with the position of the cam ring, such as flow rate or delivery pressure, is determined via the position sensor 24.
  • the measured value is fed as an input signal S A to a sensor preamplifier 29 in which signal amplification is carried out.
  • the amplified signal is fed to a controller 30, which comprises an analog-digital converter 31 for converting the amplified measurement signal into a digital value, a controller 32 and a pulse width modulator 33.
  • the controller 30 is also assigned a CAN bus 34 for transmitting the vehicle signals to the controller 30 and a calibration memory 35 for calibrating the sensor 24.
  • the function of the various subunits of the controller 30 is controlled and coordinated via a software control 36.
  • the pulse width modulated signal generated in the controller 30 is amplified in an output stage 37 and fed to the electric motor 14 as an actuating signal S Stell for setting the same.
  • the pump system described above is also suitable for use in gear systems, for example for lubricating-cooling switching pumps, or also in other applications in motor vehicles such as valve controls in internal combustion engines, Servo brakes etc.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Computer Hardware Design (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Description

Die Erfindung bezieht sich auf ein Pumpsystem mit einer hydraulischen Pumpe, insbesondere für ein Lenksystem, nach dem Oberbegriff des Anspruches 1.The invention relates to a pump system with a hydraulic pump, in particular for a steering system, according to the preamble of claim 1.

Ein solches Pumpensystem ist aus der Druckschrift DE 34 20 519 A1 bekannt, in welcher eine Radialkolbenpumpe beschrieben wird, die einen antreibbaren Rotor mit Radialbohrungen umfasst, in denen Pumpkolben angeordnet sind, welche sich an der Innenseite eines umgreifenden Kurvenringes, der exzentrisch zum Rotor gelagert ist, abstützen. Beim Umlaufen des Rotors werden von einer Mehrzahl über den Umfang gleichmässig verteilter Pumpkolben je nach aktueller Position der Pumpkolben diese mehr oder weniger weit radial in ihre aufnehmende Radialbohrung im Rotor eingedrückt. Die Pumpkolben beaufschlagen einen Fluidaufnahmeraum, wobei in Abhängigkeit der Position der Pumpkolben das Fluid in den Aufnahmeraum eingesaugt oder aus diesem herausgedrückt wird. Auf diese Weise kann ein näherungsweise konstanter Fluidstrom gefördert werden.Such a pump system is known from the document DE 34 20 519 A1, in which describes a radial piston pump that has a drivable rotor Includes radial bores in which pump pistons are arranged, which are located on the Inside of an encompassing cam ring, which is mounted eccentrically to the rotor support. When the rotor rotates, a plurality of the circumference evenly distributed pump pistons more depending on the current position of the pump pistons or less radially pressed into their receiving radial bore in the rotor. The Pump pistons act on a fluid receiving space, depending on the position the pump piston sucks the fluid into or out of the receiving space is pushed out. In this way, an approximately constant fluid flow be promoted.

Zur Einstellung der Höhe des Förderstromes und/oder des Förderdrucks ist ein elektrohydraulischer Druckregler vorgesehen, der einen die Position des äusseren Kurvenringes verstellenden Stellkolben umfasst, welcher in Abhängigkeit einer Steuerspannung, die einem Proportionalmagneten zuzuführen ist, zu verstellen ist.To set the level of the flow rate and / or the delivery pressure is a electrohydraulic pressure regulator is provided, the one the position of the outside Includes adjusting piston adjusting cam ring, which in dependence on a Control voltage to be fed to a proportional magnet must be adjusted.

Diese bekannte, regelbare Hydraulikpumpe zeichnet sich durch einen komplizierten Aufbau und einen hohen Energieverbrauch aus. Darüber hinaus besitzen diese Pumpen ein schlechtes Ansprechverhalten, wobei die verzögerten Ansprechzeiten zu ungenauen Einstellungen des Fluidförderstromes und Fluiddruckes führen.This known, controllable hydraulic pump is characterized by a complicated structure and high energy consumption out. In addition, these pumps have poor responsiveness, the delayed response times being too imprecise Fluid flow and fluid pressure settings to lead.

Der Erfindung liegt das Problem zu Grunde, ein Pumpsystem anzugeben, das präzise einstellbar ist und sich durch ein gutes Ansprechverhalten bei zugleich einfachem konstruktivem Aufbau auszeichnet. Das Pumpsystem soll zweckmäßig variabel Hand zu haben und im laufenden Betrieb an unterschiedliche äußere Lastanforderungen einzustellen sein.The invention is based on the problem of specifying a pump system that is precisely adjustable and is characterized by a good one Responsiveness with a simple construction distinguished. The pump system should be variably hand-held have and during operation to different external load requirements to be set.

Diese Problem wird erfindungsgemäß mit den Merkmalen des Anspruches 1 gelöst. Vorteilhafte Weiterbildungen des Erfindungsgegenstandes sind den Unteransprüchen zu entnehmen.This problem is solved according to the invention with the features of the claim 1 solved. Advantageous further developments of the subject matter of the invention can be found in the subclaims.

Das erfindungsgemäße Pumpsystem umfasst zum einen eine hydraulische Pumpe zur Förderung von Hydraulikfluid zu einem Verbraucher und zum anderen eine Steuer- und/oder Regeleinheit, in der in Abhängigkeit von Messsignalen bzw. sonstigen Eingangssignalen Stellsignale erzeugbar sind, die einem Stellglied der Pumpe zur Einstellung der Pumpenleistung zuführbar sind. Die Regelund Steuereinheit bildet vorteilhaft eine von der Pumpe separat ausgeführte Einheit, in welcher Zustands- und Betriebsgrößen des Verbrauchers, dem das Hydraulikfluid als Arbeitsmedium zugeführt wird, als Eingangssignale zugeführt werden. Zusätzlich oder alternativ zu den Zustands- und Betriebsgrößen des Verbrauchers können auch entsprechende Größen eines dynamischen Systems berücksichtigt werden, in das der Verbraucher eingebettet ist und innerhalb dem der Verbraucher ein Subsystem bildet. In der Regel- und Steuereinheit werden aus den zugeführten Eingangssignalen gemäß einer als Kennfeld abgelegten oder als mathematischer Zusammenhang abgespeicherten Berechnungsvorschrift Stellsignale erzeugt, die dem Stellglied der hydraulischen Pumpe zur aktuellen Einstellung der Pumpenleistung zugeführt werden.The pump system according to the invention comprises a hydraulic one Pump for delivering hydraulic fluid to a consumer and on the other hand a control and / or regulating unit in which depending on measurement signals or other input signals Control signals can be generated, the actuator of the pump can be fed to adjust the pump output. The rules and regulations Control unit advantageously forms a separate from the pump executed unit, in which condition and operating variables of the consumer to whom the hydraulic fluid is supplied as the working medium will be supplied as input signals. additionally or as an alternative to the status and operating parameters of the Consumers can also use appropriate sizes of a dynamic Systems are considered in which the consumer is embedded and within which the consumer forms a subsystem. In the regulating and control unit, the input signals supplied according to a stored as a map or as a mathematical Relationship stored calculation rule Control signals generated by the actuator of the hydraulic pump for the current setting of the pump output.

Dieses Pumpsystem eignet sich in besonderer Weise für den Einsatz in einem Lenksystem zur Lenkung der Räder in einem Kraftfahrzeug, wobei das Lenksystem den Verbraucher darstellt, der von der hydraulischen Pumpe mit Hydraulikfluid versorgt wird, und das Kraftfahrzeug das übergeordnete dynamische System darstellt, dessen Zustand bei der Einstellung der Pumpe berücksichtigt werden kann.This pump system is particularly suitable for use in a steering system for steering the wheels in a motor vehicle, the steering system being the consumer who is supplied with hydraulic fluid by the hydraulic pump, and the motor vehicle represents the superordinate dynamic system, its condition is taken into account when setting the pump can be.

Dieses Pumpsystem bietet den Vorteil einer hohen Variabilität, da die Pumpenleistung über die Signale der Regel- und Steuereinheit unmittelbar auf die Anforderungen des Verbrauchers eingestellt werden kann, was insbesondere bei einem Einsatz in Lenksystemen in Kraftfahrzeugen dazu führt, dass parametrierbare Pumpen im Lenksystem realisiert werden können, deren Leistung von Zustands- und Systemgrößen wie die Fahrzeuggeschwindigkeit, die Lenkwinkelgeschwindigkeit und/oder die Gierrate eingestellt werden kann. Ein weiterer Vorteil liegt darin, dass für den Fall, dass das System sich in einem stationären bzw. quasi stationären Zustand befindet, ein vergleichsweise geringer Energieverbrauch realisiert werden kann.This pump system offers the advantage of high variability, since the pump power via the signals of the regulating and control unit immediately adjusted to the requirements of the consumer can be what especially when used in Steering systems in motor vehicles leads to parameterizable Pumps can be realized in the steering system, their performance of state and system variables such as vehicle speed, the steering angular velocity and / or the yaw rate can be adjusted. Another advantage is that in the event that the system is in a stationary or quasi stationary state, a comparatively small Energy consumption can be realized.

Vorteilhaft wird als Pumpe eine Verstellpumpe eingesetzt, die als Flügelzellenpumpe, als Rollenzellenpumpe oder als Radialkolbenpumpe ausgeführt ist. Die Verstellpumpe weist einen innerhalb eines Kurvenrings drehbar gelagerten und motorisch angetriebenen Rotor mit Radialbohrungen mit darin radial verschieblichen und gegenüber der Innenseite des Kurvenrings abstützbaren Pumpelementen auf, welche einen Fluidaufnahmeraum beaufschlagen, wobei die Relativposition zwischen Kurvenring und Rotor über das Stellglied zwischen einer konzentrischen Lage und einer exzentrischen Lage zu verstellen ist. In dieser Ausführung erfolgt die Variierung der Pumpenleistung über die Stellsignale der Regel- und Steuereinheit durch eine über das Stellglied verursachte Einstellung der Relativposition zwischen Kurvenring und Rotor. Zustands- und Betriebsgrößen des Verbrauchers, insbesondere des Lenksystems, und/oder des übergeordneten dynamischen Systems, insbesondere des Kraftfahrzeugs, werden unmittelbar in eine Veränderung der Relativposition vom Kurvenring zum Rotor umgesetzt, so dass der von der hydraulischen Pumpe geförderte Volumenstrom prinzipiell ausschließlich durch Veränderung der Pumpengeometrie an den aktuellen Bedarf des Verbrauchers angepasst werden kann. Blenden- oder Bypasssysteme zur Regulierung des Volumenstroms können zwar in vorteilhafter Weise mit der Einstellung der Pumpengeometrie kombiniert werden, sind jedoch nicht zwingend erforderlich.A variable displacement pump is advantageously used as the pump as a vane pump, as a roller cell pump or as a radial piston pump is executed. The variable displacement pump has one inside a cam ring rotatably mounted and motor driven Rotor with radial bores with radially movable ones and towards the inside of the cam ring supportable pump elements, which have a fluid receiving space apply, the relative position between the cam ring and rotor via the actuator between a concentric position and an eccentric position is to be adjusted. In this The variation of the pump performance is carried out via the Control signals of the regulating and control unit through a Actuator caused adjustment of the relative position between Cam ring and rotor. State and operating parameters of the consumer, in particular the steering system, and / or the parent dynamic system, especially of the motor vehicle immediately into a change in the relative position from Cam ring implemented to the rotor, so that of the hydraulic Pump-conveyed volume flow in principle only by changing the pump geometry to meet current needs of the consumer can be adjusted. Aperture or bypass systems to regulate the volume flow can be advantageous Combined with the setting of the pump geometry are, however, not absolutely necessary.

Zweckmäßig ist die Position des äußeren, den Rotor umgreifenden Kurvenringes über ein als Elektromotor ausgebildetes Stellglied zu verstellen. Die elektromotorische Verstellung des äußeren Kurvenringes bietet den Vorteil, dass sehr kurze Ansprechzeiten realisiert werden können, um die Leistungsabgabe auf die aktuelle Anforderung einzustellen. Es können Reaktionszeiten bis etwa 10 ms realisiert werden.The position of the outer, encompassing the rotor is expedient Curve ring via an actuator designed as an electric motor to adjust. The electromotive adjustment of the outer Curve ring has the advantage that very short response times can be realized to the power output to the current To set the request. Response times up to about 10 ms can be realized.

Ein weiterer Vorteil besteht darin, dass der Elektromotor sehr präzise steuerbar ist und auch kleine Stellwege, die jedoch mit hohen Kräften einhergehen, umgesetzt werden können. Gegebenenfalls kann es hierbei zweckmäßig sein, zwischen dem Elektromotor und dem Kurvenring ein Untersetzungsgetriebe vorzusehen, um die geforderten kurzen Stellwege und hohen Stellkräfte auch bei verhältnismäßig kleinen Elektromotoren realisieren zu können.Another advantage is that the electric motor is very is precisely controllable and also small travel ranges, but with high forces go hand in hand, can be implemented. Possibly it can be useful here between the electric motor and to provide a reduction gear to the cam ring to the short travel distances and high positioning forces required to be able to realize relatively small electric motors.

Da die Pumpe und der den Kurvenring beaufschlagende Elektromotor grundsätzlich funktional eigenständige Baueinheiten bilden, wird ein höheres Maß an Flexibilität erreicht, welches insbesondere dadurch zustande kommt, dass lediglich die Bewegungsübertragung vom Läufer des Elektromotores auf den Kurvenring gewährleistet sein muss; zusätzliche Abstützelemente am Kurvenring sind dagegen nicht zwingend erforderlich. Die Stromzufuhr zum Elektromotor ist darüber hinaus leichter zu bewerkstelligen als die Hydraulikzufuhr bei aus dem Stand der Technik bekannten hydraulischen oder elektrohydraulischen Stellsystemen.Since the pump and the electric motor acting on the cam ring basically form functionally independent units, a higher degree of flexibility is achieved, which in particular it comes about that only the motion transmission from the rotor of the electric motor to the cam ring must be guaranteed; additional support elements on the cam ring however, are not absolutely necessary. The power supply to the electric motor is also easier to accomplish as the hydraulic supply in known from the prior art hydraulic or electro-hydraulic control systems.

Zur Positionseinstellung des Kurvenringes ist der Läufer des Elektromotors vorteilhaft mit einer Exzenterscheibe verbunden, die entweder unmittelbar die erforderliche Stellbewegung vom Läufer des Elektromotors auf den Kurvenring überträgt oder mittelbar über einen zwischengeschalteten Übertragungshebel. Sofern eine mittelbare Übertragung vorgesehen ist, ist der zwischengeschaltete Übertragungshebel zweckmäßig translatorisch zu verschieben, wobei die Verschiebebewegung erzeugt wird, indem ein Ende des Übertragungshebels von einer Kurvenbahn an der Exzenterscheibe beaufschlagt wird. Die mittelbare Übertragung unter Zwischenschaltung des Übertragungshebels bietet den Vorteil, dass auf Grund der räumlichen Trennung von Pumpe und Elektromotor eine Vielzahl von Möglichkeiten für die Anordnung des Elektromotors relativ zur Pumpe gegeben sind.The rotor of the electric motor is used to adjust the position of the cam ring advantageously connected to an eccentric disc, which either immediately the required actuating movement from The rotor of the electric motor is transferred to the cam ring or indirectly via an intermediate transmission lever. Provided an indirect transmission is provided, is the intermediate Transmission lever is expediently translatory too move, the move being generated by one end of the transfer lever from a cam track on the eccentric disc is applied. The indirect transmission under Interposition of the transmission lever offers the advantage that due to the spatial separation of pump and electric motor a variety of arrangement options of the electric motor are given relative to the pump.

Andererseits ist es auch möglich, dass die Exzenterscheibe unmittelbar am Kurvenring angreift, wobei sich diese Ausführung durch ein besonders kompaktes Baumaß auszeichnet, da auf ein zwischenliegendes Übertragungsgestänge verzichtet werden kann. Reibungsverluste können dadurch minimiert werden.On the other hand, it is also possible that the eccentric disc immediately attacks on the cam ring, this version characterized by a particularly compact size, because on a intermediate transmission linkage can be dispensed with. Friction losses can be minimized.

Zweckmäßig wird die Pumpe über einen geschlossenen Regelkreis geregelt, welcher einen Sensor zur Messung einer Ist-Größe, die dem Förderstrom bzw. dem Förderdruck der Pumpe entspricht, und darüber hinaus eine Steuer- und Regeleinheit zum Vergleich der Ist-Größe mit einem abgespeicherten oder zu ermittelnden SollWert sowie der Erzeugung eines aus dem Soll-Ist-Vergleich abgeleiteten Wert für den elektrischen Strom für den Elektromotor umfasst. Der Sensor ist hierbei vorteilhaft als ein Positionssensor zur Bestimmung der Position des Kurvenringes ausgeführt, die als Maß für den Förderdruck bzw. den Förderstrom herangezogen werden kann, da die Höhe der Auslenkung des Kurvenringes gegenüber einer Symmetrie- oder Mittenlage in Bezug auf den Rotor der Pumpe die Pumpenleistung bestimmt.The pump is useful via a closed control loop regulated, which is a sensor for measuring an actual size, the corresponds to the flow rate or pressure of the pump, and in addition, a control unit for comparing the Actual size with a stored or determined target value and the generation of one derived from the target-actual comparison Value for the electric current for the electric motor includes. The sensor is advantageous as a position sensor designed to determine the position of the cam ring, which are used as a measure of the delivery pressure or flow can be because of the amount of deflection of the cam ring compared to a symmetry or center position in relation to the rotor the pump determines the pump output.

Als Positionssensor zur Bestimmung der Kurvenringposition kann beispielsweise ein magnetoresistiver Sensor verwendet werden, der das Magnetfeld eines Permanentmagneten misst, welcher am Läufer des Elektromotors oder einem von diesem beaufschlagten Bauteil angeordnet ist. Dadurch wird bei einer Betätigung des Elektromotors das Magnetfeld des Permanentmagneten in Bezug auf den Positionssensor verändert, wobei diese Magnetfeldänderung gemessen und als Maß für die Positionsänderung herangezogen wird.Can be used as a position sensor for determining the cam ring position for example a magnetoresistive sensor can be used which measures the magnetic field of a permanent magnet, which on Rotor of the electric motor or one of these Component is arranged. As a result, when the Electric motor related to the magnetic field of the permanent magnet changed the position sensor, this magnetic field change measured and used as a measure of the change in position becomes.

Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnungen näher beschrieben. Es zeigen:

Fig. 1
eine schematische Darstellung einer Flügelzellenpumpe zur Förderung eines Hydraulikfluids aus einem Hydraulikreservoir zu einem Verbraucher, wobei ein die Pumpenleistung beeinflussender Kurvenring der Radialkolbenpumpe über einen Elektromotor zu verstellen ist,
Fig. 2
eine schematische Darstellung einer Flügelzellenpumpe mit einem Elektromotor mit Exzenterscheibe, deren Drehbewegung in eine lineare, translatorische Übertragungsbewegung eines Übertragungshebels umgesetzt wird,
Fig. 3
eine Fig. 2 entsprechende Darstellung, jedoch mit in den Kurvenring integrierter Exzenterscheibe, welche vom Läufer des Elektromotors angetrieben wird,
Fig. 4
ein magnetoresistiver Positionssensor, der mit einem auf der Exzenterscheibe angeordneten Permanentmagneten zusammenwirkt,
Fig. 5
ein Prinzipbild eines Regelkreises zur Einstellung des Elektromotors.
An embodiment of the invention is described below with reference to the drawings. Show it:
Fig. 1
2 shows a schematic representation of a vane pump for conveying a hydraulic fluid from a hydraulic reservoir to a consumer, a cam ring of the radial piston pump influencing the pump performance being adjustable via an electric motor,
Fig. 2
1 shows a schematic representation of a vane pump with an electric motor with an eccentric disk, the rotational movement of which is converted into a linear, translational transmission movement of a transmission lever,
Fig. 3
2 shows a representation corresponding to FIG. 2, but with an eccentric disk integrated in the cam ring, which is driven by the rotor of the electric motor,
Fig. 4
a magnetoresistive position sensor which interacts with a permanent magnet arranged on the eccentric disc,
Fig. 5
a schematic diagram of a control loop for adjusting the electric motor.

In den folgenden Figuren sind gleiche Bauteile mit gleichen Bezugszeichen versehen.In the following figures, the same components have the same reference numerals Mistake.

In Fig. 1 ist eine Flügelzellenpumpe 1 dargestellt, die über eine erste Förderleitung 2 Hydraulikfluid aus einem Hydraulikreservoir 3 ansaugt und über eine zweite Förderleitung 4 mit erhöhtem Druck zu einem Verbraucher 5 pumpt. Bei dem Verbraucher 5 handelt es sich insbesondere um ein hydraulisch betätigbares Lenksystem in einem Kraftfahrzeug. Von der Förderleitung 4 zweigt eine Rücklaufleitung 6 ab, die zum Hydraulikreservoir 3 zurückführt und in die ein Sicherheitsventil 7 integriert ist, welches bei Übersteigung eines Maximaldrucks in Offenstellung versetzt wird, so dass Hydraulikfluid aus der Förderleitung 4 über die Rücklaufleitung 6 in das Hydraulikreservoir 3 zurückströmen kann. Das Sicherheitsventil 7 öffnet üblicherweise erst bei einem Maximaldruck, der in der Regel deutlich höher ist als der dem Verbraucher 5 zuzuführende Förderdruck.In Fig. 1, a vane pump 1 is shown, which a first delivery line 2 hydraulic fluid from a hydraulic reservoir 3 sucks in and via a second delivery line 4 pumps increased pressure to a consumer 5. With the consumer 5 is in particular a hydraulically actuated Steering system in a motor vehicle. From the delivery line 4 branches off a return line 6 leading to the hydraulic reservoir 3 returns and in which a safety valve 7 is integrated which is in the open position when a maximum pressure is exceeded is displaced so that hydraulic fluid from the delivery line 4 via the return line 6 into the hydraulic reservoir 3 can flow back. The safety valve 7 usually opens only at a maximum pressure, which is usually significantly higher is than the delivery pressure to be supplied to the consumer 5.

Die Flügelzellenpumpe 1 umfasst einen in einem nicht näher dargestellten Gehäuse drehbar gelagerten Rotor 8, der von einem Kurvenring 9 umgriffen ist. Der Rotor 8 wird von einer Antriebseinheit angetrieben, beispielsweise von einer Brennkraftmaschine. Der Rotor 8 weist gleichmäßig über seinen Umfang verteilte Radialführungen 10 auf, in denen als Verdränger 11 ausgebildete Pumpelemente radial verschieblich aufgenommen sind. Die Verdränger 11 stützen sich an der Innenseite des Kurvenringes 9 ab. Die Radialführungen 10 kommunizieren mit einem Fluidaufnahmeraum für das zu fördernde Hydraulikfluid, wobei eine Relativbewegung der Radialkolben 11 in den Radialbohrungen 10 einen Saug- bzw. Förderdruck erzeugt, welcher das Hydraulikfluid aus dem Hydraulikreservoir 3 ansaugt und in Richtung des Verbrauchers 5 fördert.The vane pump 1 includes one in a not shown Housing rotatably mounted rotor 8 by a Curved ring 9 is encompassed. The rotor 8 is driven by a drive unit driven, for example by an internal combustion engine. The rotor 8 has evenly distributed over its circumference Radial guides 10 in which are formed as displacers 11 Pump elements are radially slidably received. The displacers 11 are supported on the inside of the cam ring 9 from. The radial guides 10 communicate with a fluid receiving space for the hydraulic fluid to be pumped, one Relative movement of the radial pistons 11 in the radial bores 10 generates a suction or delivery pressure, which the hydraulic fluid from the hydraulic reservoir 3 and in the direction of Consumer 5 promotes.

Die Pumpe 1 ist als Verstellpumpe mit veränderbarer Pumpengeometrie ausgebildet. Hierzu kann die Position des Kurvenringes 9 gegenüber dem Rotor 8 stufenlos zwischen einer konzentrischen Lage und einer maximalen exzentrischen Lage, in der der Rotor 8 unmittelbar an einer Innenseite des Kurvenringes 9 anliegt, verstellt werden. Das Maß der exzentrischen Auslenkung des Kurvenringes 9 gegenüber dem Rotor 8 bestimmt die Förderleistung der Radialkolbenpumpe 1.Pump 1 is a variable displacement pump with variable pump geometry educated. For this purpose, the position of the cam ring 9 relative to the rotor 8 continuously between a concentric Position and a maximum eccentric position in which the rotor 8 rests directly on an inside of the cam ring 9, be adjusted. The measure of the eccentric deflection of the cam ring 9 relative to the rotor 8 determines the delivery rate the radial piston pump 1.

Der Kurvenring 9 ist um einen Lagerpunkt 12 drehbar gelagert. Auf der dem Lagerpunkt 12 radial gegenüberliegenden Seite greift am Kurvenring 9 ein Stellglied 13 an; das als Elektromotor 14 ausgeführt ist und dessen auf den Kurvenring 9 zu übertragende Stellbewegung in eine Schwenkbewegung in Pfeilrichtung 15 des Kurvenringes um seinen Lagerpunkt 12 umgesetzt wird, wodurch der Kurvenring stufenlos zwischen seiner konzentrischen und der maximalen exzentrischen Lage verstellt wird. Die Übertragung der Stellbewegung von Elektromotor 14 auf Kurvenring 9 erfolgt zweckmäßig über einen translatorisch zu bewegenden Übertragungshebel 16, welcher vom Läufer des Elektromotors beaufschlagt wird und tangential am Kurvenring 9 angreift.The cam ring 9 is rotatably supported about a bearing point 12. On the side radially opposite the bearing point 12 engages an actuator 13 on the cam ring 9; that as an electric motor 14 is executed and its to be transferred to the cam ring 9 Adjustment movement in a swivel movement in the direction of the arrow 15 of the cam ring is implemented around its bearing point 12, whereby the curve ring is stepless between its concentric and the maximum eccentric position is adjusted. The transfer the actuating movement of electric motor 14 on cam ring 9 expediently takes place via a transmission lever to be moved in translation 16, which is acted upon by the rotor of the electric motor is and tangentially engages the cam ring 9.

Es kann gegebenenfalls zweckmäßig sein, anstelle eines Elektromotors als Stellglied zur Veränderung der Relativposition zwischen Kurvenring und Rotor einen Hubmagneten einzusetzen. Weiterhin kann es zweckmäßig sein, die Verstellung hydraulisch zu bewirken.It may be appropriate instead of an electric motor as an actuator for changing the relative position between To use cam ring and rotor a solenoid. Farther it may be advisable to hydraulically adjust cause.

Dem Elektromotor 14 werden zur Einstellung über Signalleitungen 17 Stellsignale SStell zugeführt, die in einer Regel- und Steuereinheit 18 erzeugt werden. Die Stellsignale SStell werden gemäß einem in der Regel- und Steuereinheit 18 als Kennfeld oder als Berechnungsformel hinterlegten Zusammenhang in Abhängigkeit von Eingangssignalen SEin generiert, die Zustands- und Betriebsgrößen der Pumpe 1, des Verbrauchers 5 sowie gegebenenfalls sonstiger Baueinheiten, insbesondere einer Brennkraftmaschine, repräsentieren.Control signals S Stell , which are generated in a regulating and control unit 18, are fed to the electric motor 14 for adjustment via signal lines 17. The control signals S Stell are generated according to a relationship stored in the regulating and control unit 18 as a map or as a calculation formula as a function of input signals S Ein , the status and operating variables of the pump 1, the consumer 5 and, if appropriate, other structural units, in particular an internal combustion engine, represent.

Durch die Veränderung der Relativposition zwischen Kurvenring und Rotor wird die Pumpengeometrie beeinflusst, was sich auf die dem Verbraucher zuzuführende Leistung P auswirkt, die sich gemäß dem Zusammenhang P = VGeom * n * p berechnet, wobei VGeom eine Geometrie-Kenngröße für die Pumpengeometrie ist, die von der Relativposition von Kurvenring zu Rotor abhängt. n bezeichnet die Drehzahl des Rotors und p den Druck des zum Verbraucher geführten Hydraulikfluids. Da die Rotordrehzahl und somit auch die Pumpenleistung bei. einem Antrieb über die Brennkraftmaschine von der Brennkraftmaschinendrehzahl abhängt, ist zur Erzielung einer konstanten Pumpenleistung eine drehzahlabhängige Pumpenregelung erforderlich, bei der zweckmäßig die Pumpengeometrie manipuliert wird. Die Pumpengeometrie wird auch zur Anpassung an den aktuellen Bedarf des Verbrauchers durch eine Beaufschlagung des Kurvenrings über den Elektromotor eingestellt. The pump geometry is influenced by the change in the relative position between the cam ring and the rotor, which has an effect on the power P to be supplied to the consumer, which in accordance with the relationship P = V Geom * n * p calculated, where V Geom is a geometry parameter for the pump geometry, which depends on the relative position of the cam ring to the rotor. n denotes the speed of the rotor and p the pressure of the hydraulic fluid supplied to the consumer. Because the rotor speed and therefore also the pump output. a drive via the internal combustion engine depends on the internal combustion engine speed, a speed-dependent pump control is necessary to achieve a constant pump output, in which the pump geometry is expediently manipulated. The pump geometry is also adjusted to adapt to the current needs of the consumer by acting on the cam ring via the electric motor.

Zusätzlich oder alternativ zur Manipulation der Pumpengeometrie kann die dem Verbraucher zuzuführende Leistung P auch durch Veränderung des dem Verbraucher zuzuführenden Drucks p verändert werden, beispielsweise durch eine variabel einstellbare Blende in der Förderleitung 4 zum Verbraucher.In addition or as an alternative to manipulating the pump geometry the power P to be supplied to the consumer can also be achieved by Change in the pressure p to be supplied to the consumer changes be, for example, by a variably adjustable Aperture in the delivery line 4 to the consumer.

Die Fig. 2 zeigt die Radialkolbenpumpe 1 in einer vergrößerten, schematischen Darstellung. Der Läufer 19 des Elektromotors 14 ist mit einer Exzenterscheibe 20 verbunden, die vom Elektromotor rotierend angetrieben wird. An der Umfangsfläche der Exzenterscheibe 20 liegt der translatorisch verschiebbare Übertragungshebel 16 an. Die Umfangsfläche der Exzenterscheibe 20 bildet eine Kurvenbahn für den Übertragungshebel 16, so dass die aktuelle Position des Übertragungshebels von der aktuellen Drehlage der Exzenterscheibe 20 bestimmt wird. Das der Exzenterscheibe 20 gegenüberliegende Ende des Übertragungshebels 16 greift tangential auf der dem Lagerpunkt 12 radial gegenüberliegenden Seite am Kurvenring 9 an und verdreht diesen in Pfeilrichtung 15 um seinen Lagerpunkt 12.2 shows the radial piston pump 1 in an enlarged, schematic representation. The rotor 19 of the electric motor 14 is connected to an eccentric disc 20 by the electric motor is driven in rotation. On the peripheral surface of the eccentric disc 20 is the translationally displaceable transmission lever 16 on. The peripheral surface of the eccentric disc 20 forms a curved path for the transmission lever 16 so that the current position of the transmission lever from the current one Rotational position of the eccentric disc 20 is determined. That of the eccentric disc 20 opposite end of the transmission lever 16 engages tangentially on the radially opposite bearing point 12 Side of the cam ring 9 and twists it in Arrow direction 15 around its bearing point 12.

Des Weiteren sind in Fig. 2 eine Ansaugöffnung 21, über die Hydraulikfluid aus dem Hydraulikreservoir der Pumpe 1 zuzuführen ist, und eine Druckabgangsöffnung 22, über die unter Druck stehendes Hydraulikfluid dem Verbraucher zuzuführen ist, eingezeichnet.Furthermore, in FIG. 2 there are an intake opening 21 via which Supply hydraulic fluid from the hydraulic reservoir of the pump 1 and a pressure outlet opening 22, via which under pressure standing hydraulic fluid is to be supplied to the consumer.

Die Darstellung der Fig. 3 entspricht derjenigen aus Fig. 2, jedoch mit dem Unterscheid, dass die Übertragung der Stellbewegung des Elektromotores 14 ohne zwischengeschaltetes Übertragungsglied, sondern vielmehr unmittelbar auf den Kurvenring 9 erfolgt. Hierzu ist die am Läufer 19 des Elektromotors angeordnete Exzenterscheibe 20 in einer korrespondierenden Exzenteraufnahme 23 auf der Außenseite des Kurvenringes 9 aufgenommen. Bei einer Verdrehung des Läufers 19 und der Exzenterscheibe 20 beaufschlagt die Außenseite der Exzenterscheibe 20 zugeordnete Wandabschnitte der Exzenteraufnahme 23 und bewirkt dadurch eine in Pfeilrichtung 15 wirkende Verstellkraft auf den Kurvenring 9, die den Kurvenring 9 um seinen Lagerpunkt 12 verdreht.3 corresponds to that from FIG. 2, however with the difference that the transmission of the actuating movement of the electric motor 14 without an intermediate transmission element, but rather directly on the curve ring 9 he follows. For this purpose, the one arranged on the rotor 19 of the electric motor Eccentric disc 20 in a corresponding eccentric mount 23 added to the outside of the cam ring 9. When the rotor 19 and the eccentric disc 20 are rotated acts on the outside of the eccentric disc 20 assigned Wall sections of the eccentric receptacle 23 and thereby causes one adjustment force acting in the direction of arrow 15 on the cam ring 9, which rotates the cam ring 9 about its bearing point 12.

Um die Pumpe 1 in einem geschlossenen Regelkreis betreiben und die Pumpenleistung auf einem gewünschten Niveau einstellen zu können, muss die aktuelle Position des Kurvenringes in Bezug auf den Rotor sensorisch ermittelt werden. Hierzu ist ein in Fig. 4 dargestellter Positionssensor 24 vorgesehen, welcher vorteilhaft magnetoresistiv ausgebildet ist und mit einem Permanentmagneten 25 zusammenwirkt, der zweckmäßig auf der Stirnseite der Exzenterscheibe 20 angeordnet ist. Der magnetoresistive Positionssensor 24 ist in der Lage, das vom Permanentmagneten 25 erzeugte Magnetfeld zu messen. Auf Grund der exzentrischen Anordnung der Exzenterscheibe 20 wird vom Positionssensor 24 ein von der aktuellen Drehlage der Exzenterscheibe 20 abhängendes Magnetfeld sensiert, aus dem auf die Drehposition geschlossen werden kann. Da die Exzenterscheibe 20 und der Kurvenring 9 kinematisch gekoppelt sind, kann aus der Position der Exzenterscheibe 20 auch auf die Position des Kurvenringes 9 rückgeschlossen werden.To operate pump 1 in a closed control loop and set the pump output to a desired level must, the current position of the cam ring in relation be sensed on the rotor. For this, an in Fig. 4 shown position sensor 24 is provided, which is advantageously magnetoresistive and with a permanent magnet 25 interacts, which is useful on the front the eccentric disc 20 is arranged. The magnetoresistive Position sensor 24 is capable of that from the permanent magnet 25 generated magnetic field to measure. Because of the eccentric Arrangement of the eccentric disc 20 is from the position sensor 24 one from the current rotational position of the eccentric disc 20 dependent magnetic field senses from which to the rotating position can be closed. Since the eccentric disc 20 and Cam ring 9 are kinematically coupled, can be out of position the eccentric disc 20 also to the position of the cam ring 9 be inferred.

Gegebenenfalls kann es aber auch zweckmäßig sein, die aktuelle Position des Kurvenringes 9 unmittelbar zu messen, beispielsweise durch Befestigen eines Permanentmagneten auf der Außenseite des Kurvenringes 9 und Sensieren über einen magnetoresistiven Positionssensor.If necessary, however, it may also be appropriate to use the current one To measure the position of the cam ring 9 directly, for example by attaching a permanent magnet to the outside of the cam ring 9 and sensing via a magnetoresistive Position sensor.

Der Positionssensor 24 ist vorteilhaft ortsfest auf einer Platine 26 gehalten, auf der zusätzliche Auswertekomponenten 27 zur Auswertung der Messsignale des Positionssensors 24 angeordnet sind. The position sensor 24 is advantageously stationary on a circuit board 26 held on which additional evaluation components 27 arranged to evaluate the measurement signals of the position sensor 24 are.

Fig. 4 ist außerdem zu entnehmen, dass am Elektromotor 14 ein Untersetzungsgetriebe vorgesehen sein kann, um die Motordrehung des Elektromotors in eine kleinere Drehung, jedoch mit höherem Drehmoment, zu übersetzen.Fig. 4 can also be seen that on the electric motor 14 Reduction gear can be provided to the motor rotation of the electric motor in a smaller rotation, but with a higher one Torque to translate.

Fig. 5 zeigt einen geschlossenen Regelkreis, der insbesondere in einer Regel- und Steuereinheit 18 verwirklicht ist, zur Einstellung des Elektromotors 14 und damit des Kurvenringes der Pumpe und der Förderleistung der Pumpe. Über den Positionssensor 24 wird der aktuelle Ist-Wert der Exzenterscheibe bzw. des Kurvenringes bzw. ein mit der Position des Kurvenringes korrelierender Wert wie Förderstrom oder Förderdruck ermittelt. Der Messwert wird als Eingangssignal SEin einem Sensorvorverstärker 29 zugeführt, in dem eine Signalverstärkung durchgeführt wird. Das verstärkte Signal wird einem Controller 30 zugeführt, der einen Analog-Digital-Wandler 31 zur Umwandlung des verstärkten Messsignales in einen Digitalwert, einen Regler 32 und einen Pulsweitenmodulierer 33 umfasst. Dem Controller 30 sind darüber hinaus ein CAN-Bus 34 zur Übertragung der Fahrzeugsignale zum Controller 30 sowie ein Kalibrierspeicher 35 zur Kalibrierung des Sensors 24 zugeordnet. Über eine Softwaresteuerung 36 wird die Funktion der verschiedenen Untereinheiten des Controllers 30 gesteuert und koordiniert.5 shows a closed control loop, which is implemented in particular in a regulating and control unit 18, for adjusting the electric motor 14 and thus the cam ring of the pump and the delivery rate of the pump. The current actual value of the eccentric disc or the cam ring or a value correlating with the position of the cam ring, such as flow rate or delivery pressure, is determined via the position sensor 24. The measured value is fed as an input signal S A to a sensor preamplifier 29 in which signal amplification is carried out. The amplified signal is fed to a controller 30, which comprises an analog-digital converter 31 for converting the amplified measurement signal into a digital value, a controller 32 and a pulse width modulator 33. The controller 30 is also assigned a CAN bus 34 for transmitting the vehicle signals to the controller 30 and a calibration memory 35 for calibrating the sensor 24. The function of the various subunits of the controller 30 is controlled and coordinated via a software control 36.

Das im Controller 30 erzeugte, pulsweitenmodulierte Signal wird in einer Endstufe 37 verstärkt und dem Elektromotor 14 als Stellsignal SStell zur Einstellung desselben zugeführt.The pulse width modulated signal generated in the controller 30 is amplified in an output stage 37 and fed to the electric motor 14 as an actuating signal S Stell for setting the same.

Das vorbeschriebene Pumpsystem eignet sich auch zur Anwendung in Getriebesystemen, beispielsweise für Schmier-Kühl-Schaltpumpen, oder auch in sonstigen Anwendungen in Kraftfahrzeugen wie zum Beispiel Ventilsteuerungen in Verbrennungsmotoren, Servobremsen etc. The pump system described above is also suitable for use in gear systems, for example for lubricating-cooling switching pumps, or also in other applications in motor vehicles such as valve controls in internal combustion engines, Servo brakes etc.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
FlügelzellenpumpeVane pump
22
Förderleitungdelivery line
33
Hydraulikreservoirhydraulic reservoir
44
Förderleitungdelivery line
55
Verbraucherconsumer
66
RücklaufleitungReturn line
77
Sicherheitsventilsafety valve
88th
Rotorrotor
99
Kurvenringcam ring
1010
Radialführungradial guide
1111
Verdrängerdisplacement
1212
Lagerpunktbearing point
1313
Stellgliedactuator
1414
Elektromotorelectric motor
1515
Pfeilrichtungarrow
1616
Übertragungshebeltransmission lever
1717
Signalleitungensignal lines
1818
Regel- und SteuereinheitRegulation and control unit
1919
Läuferrunner
2020
Exzenterscheibeeccentric
2121
Ansaugöffnungsuction
2222
DruckabgangsöffnungPressure outlet opening
2323
ExzenteraufnahmeExzenteraufnahme
2424
Positionssensorposition sensor
2525
Permanentmagnetpermanent magnet
2626
Platinecircuit board
2727
Auswertekomponenteevaluation component
2828
Untersetzungsgetriebe Reduction gear
2929
SensorvorverstärkerSensorvorverstärker
3030
Controllercontroller
3131
AD-WandlerADC
3232
Reglerregulator
3333
PulsweitenmoduliererPulsweitenmodulierer
3434
CAN-BusCAN bus
3535
KalibrierspeicherCalibration
3636
Softwaresteuerungsoftware control
3737
Endstufefinal stage

Claims (7)

  1. Pump system having a hydraulic rotary pump for a steering system for steering the wheels in a motor vehicle, having the following features:
    an actuator (13) is provided which influences the pump output and to which actuating signals (SStell) of a regulating and control unit (18) can be fed for adjustment purposes,
    input signals (SEin) can be fed to the regulating and control unit (18), the former representing state and operating variables of a load (5) and/or of a dynamic system into which the load (5) is integrated,
    the actuating signals (SStell) can be produced as a function of the input signals (SEin) in accordance with a functional interrelationship stored in the regulating and control device and can be fed to the actuator (13), and
    the actuator (13) is an electric motor (14),
    the rotary pump is configured as a variable displacement pump and has a rotor (8) which is rotatably mounted within a cam ring (9), is driven by a motor and has radial bores (10) with pump elements which can be displaced radially therein and can be supported with respect to the inner side of the cam ring,
    characterized by the following features:
    the actuator (13) drives an eccentric disc (20) whose movement can be transmitted onto the cam ring (9), as a result of which the cam ring (9) can be displaced relative to the rotor (8),
    a position sensor (24) is provided for determining the position of the cam ring (9) or a variable correlating with it, and the electrical current applied to the actuator (13) is to be set as a function of measured signals of the position sensor (24),
    the position sensor (24) is of magnetoresistive design, it being intended for the current position of the rotor of the electric motor (19) or of the component acted on by it to be determined via the measurement of the magnetic field of a permanent magnet (25) which is arranged on the actuator (13) or a component acted on by the latter.
  2. Pump system according to Claim 1, characterized in that a closed-loop regulating circuit is provided in order to adjust an electrical current applied to the actuator (13), the regulating circuit comprising the position sensor (24) for measuring an actual variable which correlates with the feed stream and/or the feed pressure and a regulator (32) for comparing the actual variable with a setpoint value and a value to be produced therefrom for the electrical current.
  3. Pump system according to either of Claims 1 and 2, characterized in that the pump used is a vane cell pump or roller cell pump or radial piston pump which has a rotor (8) which is rotatably mounted within a cam ring (9), is driven by a motor and has radial bores (10) with pump elements which can be displaced radially therein, can be supported with respect to the inner side of the cam ring and act on a fluid accommodation space, it being intended for the relative position between the cam ring (9) and rotor (8) to be adjusted between a concentric position and an eccentric position via the actuator (13).
  4. Pump system according to one of Claims 1 to 3, characterized in that a transmission lever (16) which can be moved translationally is provided between the eccentric disc (20) and cam ring (9).
  5. Pump system according to one of Claims 1 to 4, characterized in that the eccentric disc (20) acts directly on the cam ring (9).
  6. Pump system according to one of Claims 1 to 5, characterized in that the cam ring (9) is mounted so as to be pivotable about a bearing point (12) and the actuator (13) acts on the cam ring (9) with spacing from the bearing point (12).
  7. Pump system according to one of Claims 1 to 6, characterized in that a step-down gear mechanism (28) is provided between the actuator (13) and the adjustable cam ring (9).
EP02716707A 2001-02-03 2002-02-01 Pump system comprising a hydraulic pump, particularly for a steering system Expired - Lifetime EP1356208B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10104851 2001-02-03
DE10104851A DE10104851A1 (en) 2001-02-03 2001-02-03 Pump system with a hydraulic pump, in particular for a steering system
PCT/EP2002/001023 WO2002063170A1 (en) 2001-02-03 2002-02-01 Pump system comprising a hydraulic pump, particularly for a steering system

Publications (2)

Publication Number Publication Date
EP1356208A1 EP1356208A1 (en) 2003-10-29
EP1356208B1 true EP1356208B1 (en) 2004-09-15

Family

ID=7672712

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02716707A Expired - Lifetime EP1356208B1 (en) 2001-02-03 2002-02-01 Pump system comprising a hydraulic pump, particularly for a steering system

Country Status (6)

Country Link
US (1) US20040096334A1 (en)
EP (1) EP1356208B1 (en)
JP (1) JP2004522909A (en)
DE (2) DE10104851A1 (en)
ES (1) ES2229111T3 (en)
WO (1) WO2002063170A1 (en)

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Also Published As

Publication number Publication date
WO2002063170A1 (en) 2002-08-15
EP1356208A1 (en) 2003-10-29
DE50201013D1 (en) 2004-10-21
JP2004522909A (en) 2004-07-29
US20040096334A1 (en) 2004-05-20
DE10104851A1 (en) 2002-08-22
ES2229111T3 (en) 2005-04-16

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