EP1532034A1 - Power-steering device for a vehicle - Google Patents

Power-steering device for a vehicle

Info

Publication number
EP1532034A1
EP1532034A1 EP03794865A EP03794865A EP1532034A1 EP 1532034 A1 EP1532034 A1 EP 1532034A1 EP 03794865 A EP03794865 A EP 03794865A EP 03794865 A EP03794865 A EP 03794865A EP 1532034 A1 EP1532034 A1 EP 1532034A1
Authority
EP
European Patent Office
Prior art keywords
control valve
power steering
flow
steering device
partial flow
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.)
Withdrawn
Application number
EP03794865A
Other languages
German (de)
French (fr)
Inventor
Bernd Knoff
Dieter Neugebauer
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.)
Mercedes Benz Group AG
Original Assignee
DaimlerChrysler AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP1532034A1 publication Critical patent/EP1532034A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/065—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by specially adapted means for varying pressurised fluid supply based on need, e.g. on-demand, variable assist

Definitions

  • the invention relates to a power steering device for a vehicle according to the preamble of claim 1.
  • Power steering systems are generally known and are used as standard for practically all motor vehicles.
  • a power steering pump circulates a hydraulic medium, which is used to assist in executing steering movements.
  • Power steering pumps that are driven by an internal combustion engine constantly circulate a certain amount of oil, even if this is not required. This consumes energy and generates heat and pollutants that have to be disposed of.
  • the object of the invention is to provide a power steering device which still enables servo assistance even if the control valve fails.
  • the advantage is that servo support is possible independently of the control valve and simultaneous control of the power steering pump is possible in order to provide a volume flow of the hydraulic medium that is tailored to the needs. len. On the one hand, this increases the operational reliability of the system and, on the other hand, comfortable and needs-based steering support is available.
  • the volume flow of a conventional power steering pump takes effect automatically.
  • the basic quantity and the regulating quantity at least the basic quantity is still available for servo assistance even with a jammed control valve, so that the driver is able to perform normal steering movements with the usual comfort. This is a significant gain in safety compared to the prior art with significantly improved energy savings and a reduction in the operating temperature of the power steering pump.
  • Fig. 1 is a schematic representation of a hydraulic circuit with a controllable hydraulic medium flow
  • FIG. 2 shows a detailed view of a parameter valve in the energized state (a) and in the de-energized state (b).
  • a power steering pump 1 is advantageously driven by an internal combustion engine by means of a belt drive, not shown. It continuously pumps hydraulic medium, preferably oil, in a hydraulic circuit, which is designated as a whole by 11, through a rotary slide valve 5 and a steering cylinder 6 assigned to it. On the suction side of the power steering pump 1 there is a pressure-free reservoir 4 for the hydraulic medium, preferably oil. The power steering pump 1 takes oil from the reservoir 4 and feeds it back into this reservoir 4.
  • a conventional pressure relief valve 2 is arranged downstream of the power steering pump 1 on the pressure side thereof, with an overpressure line 3 in which oil can be supplied in the usual way upstream of the power steering pump 1 of this power steering pump 1 and / or the accumulator 4.
  • the circulated oil quantity Q is preferably divided into a basic partial flow A and a control partial flow B on the pressure side of the power steering pump 1 by a control valve 7 for setting a volume flow of a hydraulic medium, which is preferably a parameter valve, as required.
  • the control valve 7 is activated by a control unit 10, which can be designed as a separate unit or can also be integrated into an already existing control unit of the vehicle.
  • the control valve 7 is expediently structurally integrated in the power steering pump 1, but can also be a separate component.
  • the driving speed, the steering angle, the steering angle speed, the engine speed, the lateral acceleration and other variables for controlling the power steering pump 1 are processed in the control unit 10. Depending on the driving and steering situation, the oil quantity of the power steering pump 1, which is delivered to the steering gear 6, is increased or decreased.
  • the control valve 7 is arranged on the pressure side of the power steering pump 1 such that the volume flow Q of the hydraulic medium sucked in by the power steering pump 1 is at least in the first basic partial flow A, which is independent of the operating state of the control valve 7 and a second control partial flow B, which is dependent on the operating state of the Control valve 7 is divided. Downstream of the control valve 7, the two partial flows A, B are fed to the rotary slide valve 5 and for steering assistance used. The individual volume flows Q, A, B, A + B are marked with arrows in the drawing. The volume flow of the power steering pump 1 is thus divided in such a way that the base part flow A is circulated independently of a driving and / or control situation and the control part flow B is regulated depending on the need.
  • FIG. 2 shows a detailed view of a preferred control valve 7 in the maximally energized state (FIG. 2a) in the closed position and in the de-energized state in the open position (FIG. 2b).
  • the amount of oil Q is fed into the control valve 7.
  • the control valve 7 is closed.
  • the valve needle 20 is thick at the lower end 22 and has a taper 21 along its longitudinal extent. The expansion of the taper 21 along the longitudinal extent is dimensioned such that in the closed position, a connection between the channel 8 and the incoming oil is created via this taper 21.
  • the excess of the incoming oil quantity Q leaves the control valve 7 via this connection and is discharged from the control valve 7 via the discharge line 9.
  • This oil can either be supplied to the inner pump circuit on the suction side or can also be passed into the reservoir 4.
  • the control valve 7 particularly preferably has a flow in the size of the base substream A.
  • the control valve 7 is open when de-energized. This can be seen in Fig. 2b.
  • the valve needle 20 now completely clears the cross section of the channel 8, with the thick end 22 of the valve needle 20 blocking the derivative 9 at the same time. Details of any sealants are not shown.
  • the control valve 7 has in the fully open supply there was a flow equal to the sum of the basic partial flow A and the maximum control partial flow B, and the entire volume flow A + B is available for steering assistance.
  • an additional bypass line can also be provided, through which the basic partial flow A flows permanently. The control valve 7 can then be blocked for the hydraulic medium in the closed state.
  • bypass line can also be combined with a control valve 7, which always allows a certain basic amount of the hydraulic medium to pass.
  • Control valve 7 is advantageously completely open in the de-energized state.
  • the volume flow Q can be regulated down to the base partial flow A by actively controlling the control valve 7.
  • control valve 7 When driving straight ahead of a vehicle which is equipped with the device according to the invention, the control valve 7 is energized and is completely closed. Only the base substream A is circulated. Depending on the driving situation, the current supply to the control valve 7 is reduced during a steering movement and, in addition to the base part stream A, the control part stream B is also controlled by opening the control valve 7.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)
  • Steering Control In Accordance With Driving Conditions (AREA)

Abstract

The invention relates to a power-steering device comprising a power-steering pump, and to a method for operating a power-steering device for a vehicle comprising a hydraulic circuit (11) provided with a rotary slide valve (5) and a steering cylinder (6) which is associated therewith, and a control valve (7) for adjusting a volume flow of a hydraulic medium as required. Said control valve (7) is arranged in or on the power-steering pump (1), on the pressure side, in such a way that it divides the volume flow (Q) from the power-steering pump (1) into at least a first base partial flow (A) and a second pilot partial flow (B). Said base partial flow (A) is independent from the operating state of the control valve (7), whereas the pilot partial flow (B) is dependent on the operating state of the control valve (7).

Description

Lenkhelfvorrichtung für ein Fahrzeug Power steering device for a vehicle
Die Erfindung betrifft eine Lenkhelfvorrichtung für ein Fahrzeug gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a power steering device for a vehicle according to the preamble of claim 1.
Servolenkungen sind allgemein bekannt und werden serienmäßig für praktisch alle Kraftfahrzeuge eingesetzt. Dabei wälzt üblicherweise eine Lenkhelfpumpe ein Hydraulikmedium um, welches beim Ausführen von Lenkbewegungen unterstützend zum Einsatz kommt. Lenkhelfpumpen, die von einem Verbrennungsmotor angetrieben werden, wälzen jedoch ständig eine bestimmte Menge Öl um, auch wenn diese nicht benötigt wird. Das verbraucht Energie und erzeugt Wärme und Schadstoffe, die entsorgt werden müssen.Power steering systems are generally known and are used as standard for practically all motor vehicles. Usually, a power steering pump circulates a hydraulic medium, which is used to assist in executing steering movements. Power steering pumps that are driven by an internal combustion engine constantly circulate a certain amount of oil, even if this is not required. This consumes energy and generates heat and pollutants that have to be disposed of.
Aus der EP Al-1109638 ist eine Servolenkung mit einer geregelten Lenkhelfpumpe bekannt, bei der die Olmenge abhängig vom Bedarf an Lenkunterstützung geregelt wird. Die Olmenge stellt sich durch das Öffnungsverhältnis des Regelventils proportional zum elektrischen Steuerstrom ein. Allerdings steht bei einem Systemausfall keine Servounterstützung mehr zur Verfügung.From EP Al-1109638 a power steering system with a regulated power steering pump is known, in which the amount of oil is regulated depending on the need for steering assistance. The amount of oil is adjusted by the opening ratio of the control valve proportional to the electrical control current. However, servo support is no longer available in the event of a system failure.
Aufgabe der Erfindung ist es, eine Lenkhelfvorrichtung zu schaffen, die auch bei Ausfall des Regelventils noch eine Servounterstützung ermöglicht.The object of the invention is to provide a power steering device which still enables servo assistance even if the control valve fails.
Die Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst.The object is solved by the features of claim 1.
Der Vorteil liegt darin, dass eine Servounterstützung unabhängig vom Regelventil möglich ist und gleichzeitige eine Regelung der Lenkhelfpumpe möglich ist, um einen bedarfsgerechten Volumenstroms des Hydraulikmediums zur Verfügung zu stel- len. Dies erhöht zum einen die Betriebssicherheit des Systems und zum anderen ist eine komfortable und bedarfsgerechte Lenkunterstützung verfügbar.The advantage is that servo support is possible independently of the control valve and simultaneous control of the power steering pump is possible in order to provide a volume flow of the hydraulic medium that is tailored to the needs. len. On the one hand, this increases the operational reliability of the system and, on the other hand, comfortable and needs-based steering support is available.
Bei Ausfall des Systems wird automatisch der Volumenstrom einer konventionellen Lenkhelfpumpe wirksam. Durch die Aufteilung in Basismenge und Regelmenge steht selbst bei einem klemmenden Regelventil immer mindestens noch die Grundmenge für die Servounterstützung zur Verfügung, so dass der Fahrer in der Lage ist, normale Lenkbewegungen mit gewohntem Komfort auszuführen. Dies ist ein deutlicher Sicherheitsgewinn gegenüber dem Stand der Technik bei deutlich verbesserter Energieeinsparung und Reduzierung der Betriebstemperatur der Lenkhelfpumpe .If the system fails, the volume flow of a conventional power steering pump takes effect automatically. By dividing the basic quantity and the regulating quantity, at least the basic quantity is still available for servo assistance even with a jammed control valve, so that the driver is able to perform normal steering movements with the usual comfort. This is a significant gain in safety compared to the prior art with significantly improved energy savings and a reduction in the operating temperature of the power steering pump.
Weitere Ausgestaltungen und weitere Vorteile der Erfindung sind der Beschreibung und den weiteren Ansprüchen zu entnehmen.Further refinements and further advantages of the invention can be found in the description and the further claims.
Im weiteren ist die Erfindung anhand einer Zeichnung näher erläutert .The invention is explained in more detail with reference to a drawing.
Dabei zeigen:Show:
Fig. 1 eine schematische Darstellung eines Hydraulikkreislaufs mit einem regelbaren Hydraulikmedienstrom undFig. 1 is a schematic representation of a hydraulic circuit with a controllable hydraulic medium flow and
Fig. 2 eine Detailansicht eines Parameterventils im bestrom- ten Zustand (a) und im nichtbestromten Zustand (b) .2 shows a detailed view of a parameter valve in the energized state (a) and in the de-energized state (b).
In Fig. 1 ist schematisch ein bevorzugter Hydraulikkreislauf mit der erfindungsgemäßen Lenkhelfvorrichtung für ein Fahrzeug dargestellt. Eine Lenkhelfpumpe 1 wird günstigerweise mittels einem nicht dargestellten Riementrieb von einem Verbrennungsmotor angetrieben. Sie fördert ständig Hydraulikmedium, vorzugsweise Öl, in einem Hydraulikkreislauf, der insgesamt mit 11 bezeichnet ist, durch ein Drehschieberventil 5 und einen diesem zugeordneten Lenkzylinder 6. Auf der Saugseite der Lenkhelfpumpe 1 ist ein druckloser Speicher 4 für das Hydraulikmedium, vorzugsweise Öl, angeordnet. Die Lenkhelfpumpe 1 entnimmt dem Speicher 4 Öl und führt dieses wieder in diesen Speicher 4 zurück. Weiterhin ist stromab der Lenkhelfpumpe 1 auf deren Druckseite ein übliches Druckbegrenzungsventil 2 angeordnet mit einer Überdruckleitung 3, in der Öl in üblicher Weise stromauf der Lenkhelfpumpe 1 dieser Lenkhelfpumpe 1 und/oder dem Speicher 4 zuführbar ist.1 schematically shows a preferred hydraulic circuit with the power steering device according to the invention for a vehicle. A power steering pump 1 is advantageously driven by an internal combustion engine by means of a belt drive, not shown. It continuously pumps hydraulic medium, preferably oil, in a hydraulic circuit, which is designated as a whole by 11, through a rotary slide valve 5 and a steering cylinder 6 assigned to it. On the suction side of the power steering pump 1 there is a pressure-free reservoir 4 for the hydraulic medium, preferably oil. The power steering pump 1 takes oil from the reservoir 4 and feeds it back into this reservoir 4. Furthermore, a conventional pressure relief valve 2 is arranged downstream of the power steering pump 1 on the pressure side thereof, with an overpressure line 3 in which oil can be supplied in the usual way upstream of the power steering pump 1 of this power steering pump 1 and / or the accumulator 4.
Die umgewälzte Olmenge Q wird vorzugsweise auf der Druckseite der Lenkhelfpumpe 1 durch ein Regelventil 7 zum bedarfsabhängigen Einstellen eines Volumenstroms eines Hydraulikmediums, welches bevorzugt ein Parameterventil ist, in einen Basisteilstrom A und einen Regelteilstrom B aufgeteilt. Die An- steuerung des Regelventils 7 erfolgt durch eine Steuereinheit 10, die als separate Einheit ausgeführt sein kann, oder auch in ein bereits vorhandenes Steuergerät des Fahrzeugs integriert sein kann. Das Regelventil 7 ist zweckmäßigerweise in die Lenkhelfpumpe 1 baulich integriert, kann aber auch ein separates Bauteil sein.The circulated oil quantity Q is preferably divided into a basic partial flow A and a control partial flow B on the pressure side of the power steering pump 1 by a control valve 7 for setting a volume flow of a hydraulic medium, which is preferably a parameter valve, as required. The control valve 7 is activated by a control unit 10, which can be designed as a separate unit or can also be integrated into an already existing control unit of the vehicle. The control valve 7 is expediently structurally integrated in the power steering pump 1, but can also be a separate component.
Im Steuergerät 10 werden die Fahrgeschwindigkeit, der Lenkwinkel, die Lenkwinkelgeschwindigkeit die Motordrehzahl, die Querbeschleunigung und weitere Größen zur Steuerung der Lenkhelfpumpe 1 verarbeitet. Abhängig von der Fahr- und Lenksituation wird die Olmenge der Lenkhelfpumpe 1, die zum Lenkgetriebe 6 abgegeben wird, angehoben oder verringert.The driving speed, the steering angle, the steering angle speed, the engine speed, the lateral acceleration and other variables for controlling the power steering pump 1 are processed in the control unit 10. Depending on the driving and steering situation, the oil quantity of the power steering pump 1, which is delivered to the steering gear 6, is increased or decreased.
Das Regelventil 7 ist auf der Druckseite der Lenkhelfpumpe 1 so angeordnet, dass der von der Lenkhelfpumpe 1 angesaugte Volumenstrom Q des Hydraulikmediums zumindest in den ersten Basisteilstrom A, der unabhängig vom Betriebszustand des Regelventils 7 ist und einen zweiten Regelteilstrom B, der abhängig vom Betriebszustand des Regelventils 7 ist, aufteilt. Stromab des Regelventils 7 werden die beiden Teilströme A, B dem Drehschieberventil 5 zugeführt und zur Lenkunterstützung eingesetzt. Die einzelnen Volumenströme Q, A, B, A+B sind in der Zeichnung mit Pfeilen gekennzeichnet . Der Volumenstrom der Lenkhelfpumpe 1 wird also dergestalt aufgeteilt, dass der Basisteilstrom A unabhängig von einer Fahr- und/oder RegelSituation umgewälzt wird und der Regelteilstrom B abhängig vom Bedarf geregelt wird.The control valve 7 is arranged on the pressure side of the power steering pump 1 such that the volume flow Q of the hydraulic medium sucked in by the power steering pump 1 is at least in the first basic partial flow A, which is independent of the operating state of the control valve 7 and a second control partial flow B, which is dependent on the operating state of the Control valve 7 is divided. Downstream of the control valve 7, the two partial flows A, B are fed to the rotary slide valve 5 and for steering assistance used. The individual volume flows Q, A, B, A + B are marked with arrows in the drawing. The volume flow of the power steering pump 1 is thus divided in such a way that the base part flow A is circulated independently of a driving and / or control situation and the control part flow B is regulated depending on the need.
In Fig. 2 ist eine Detailansicht eines bevorzugten Regelventils 7 in maximal bestromten Zustand (Fig. 2a) in der Geschlossenstellung und im unbestromten Zustand in der Geöffnetstellung (Fig. 2b) dargestellt.FIG. 2 shows a detailed view of a preferred control valve 7 in the maximally energized state (FIG. 2a) in the closed position and in the de-energized state in the open position (FIG. 2b).
Die Olmenge Q wird in das Regelventil 7 geleitet. Im bestromten Zustand ist das Regelventil 7 geschlossen. Dies bedeutet in diesem bevorzugten Ausführungsbeispiel, dass der Kanal 8 durch die Ventilnadel 20 soweit verschlossen ist, dass nur der Basisteilstrom A das Regelventil 7 passieren und zum Drehschieberventil 5 gelangen kann. Die Ventilnadel 20 ist am unteren Ende 22 dick und weist entlang ihrer Längserstreckung eine Verjüngung 21 auf. Die Ausdehnung der Verjüngung 21 entlang der Längserstreckung ist so bemessen, dass in der Geschlossenstellung über diese Verjüngung 21 eine Verbindung zwischen dem Kanal 8 und dem eintretenden Öl entsteht . Der Ü- berschuss der eintretenden Olmenge Q verlässt das Regelventil 7 über diese Verbindung und wird über die Abführleitung 9 aus dem Regelventil 7 abgeführt. Dieses Öl kann entweder dem inneren Pumpenkreislauf auf der Saugseite zugeführt werden oder auch in den Speicher 4 geleitet werden. Besonders bevorzugt weist das Regelventil 7 im geschlossenen Zustand einen Durch- fluss in der Größe des Basisteilstroms A auf.The amount of oil Q is fed into the control valve 7. In the energized state, the control valve 7 is closed. In this preferred exemplary embodiment, this means that the channel 8 is closed by the valve needle 20 to such an extent that only the base partial stream A can pass the control valve 7 and reach the rotary slide valve 5. The valve needle 20 is thick at the lower end 22 and has a taper 21 along its longitudinal extent. The expansion of the taper 21 along the longitudinal extent is dimensioned such that in the closed position, a connection between the channel 8 and the incoming oil is created via this taper 21. The excess of the incoming oil quantity Q leaves the control valve 7 via this connection and is discharged from the control valve 7 via the discharge line 9. This oil can either be supplied to the inner pump circuit on the suction side or can also be passed into the reservoir 4. In the closed state, the control valve 7 particularly preferably has a flow in the size of the base substream A.
Das Regelventil 7 ist im stromlosen Zustand geöffnet. Dies ist in Fig. 2b erkennbar. Die Ventilnadel 20 gibt nunmehr den Querschnitt des Kanals 8 vollständig frei, wobei gleichzeitig das dicke Ende 22 der Ventilnadel 20 die Ableitung 9 versperrt. Details von etwaigen Dichtungsmitteln sind nicht gezeigt. Das Regelventil 7 hat im vollständig geöffneten Zu- stand einen Durchfluss in der Größe der Summe aus Basisteilstrom A und maximalem Regelteilstrom B, und der gesamte Volumenstrom A+B steht zur Lenkunterstützung zur Verfügung.The control valve 7 is open when de-energized. This can be seen in Fig. 2b. The valve needle 20 now completely clears the cross section of the channel 8, with the thick end 22 of the valve needle 20 blocking the derivative 9 at the same time. Details of any sealants are not shown. The control valve 7 has in the fully open supply there was a flow equal to the sum of the basic partial flow A and the maximum control partial flow B, and the entire volume flow A + B is available for steering assistance.
Statt einem Ventil, das immer zumindest den Basisteilstrom A durchsteuert, kann jedoch auch eine zusätzliche Bypassleitung vorgesehen sein, durch die permanent der Basisteilstrom A fließt. Das Regelventil 7 kann dann im geschlossenen Zustand für das Hydraulikmedium gesperrt sein.Instead of a valve which always controls at least the basic partial flow A, an additional bypass line can also be provided, through which the basic partial flow A flows permanently. The control valve 7 can then be blocked for the hydraulic medium in the closed state.
Je nach Durchflussmengen und Auslegung des Systems kann jedoch auch eine solche Bypassleitung mit einem Regelventil 7 kombiniert sein, welches immer eine gewisse Grundmenge des Hydraulikmediums durchlässt.Depending on the flow rates and the design of the system, however, such a bypass line can also be combined with a control valve 7, which always allows a certain basic amount of the hydraulic medium to pass.
Vorteilhafterweise ist Regelventil 7 im stromlosen Zustand vollständig geöffnet.Control valve 7 is advantageously completely open in the de-energized state.
Im bestromten Zustand des Regelventils 7 kann der Volumenstrom Q durch aktives Ansteuern des Regelventils 7 bis zum Basisteilstrom A heruntergeregelt werden.In the energized state of the control valve 7, the volume flow Q can be regulated down to the base partial flow A by actively controlling the control valve 7.
Bei Geradeausfahrt eines Fahrzeugs, welches mit der erfindungsgemäßen Vorrichtung ausgerüstet ist, wird das Regelventil 7 bestromt und ist vollständig geschlossen. Nur der Basisteilstrom A wird umgewälzt. Abhängig von der Fahrsituation wird bei einer Lenkbewegung die Bestromung des Regelventils 7 reduziert und zusätzlich zum Basisteilstrom A durch Öffnen des Regelventils 7 der Regelteilstrom B dazugesteuert .When driving straight ahead of a vehicle which is equipped with the device according to the invention, the control valve 7 is energized and is completely closed. Only the base substream A is circulated. Depending on the driving situation, the current supply to the control valve 7 is reduced during a steering movement and, in addition to the base part stream A, the control part stream B is also controlled by opening the control valve 7.
Selbst im Fall eines klemmenden Regelventils in Geschlossenstellung steht immer noch eine Grundmenge für die Servounterstützung zur Verfügung. Damit lassen sich die meisten Fahrmanöver problemlos durchführen. Erst bei extremen Lenkbewegungen oder beim Parkieren kann es zu Komforteinbußen kommen. Bei einem Ausfall der Ventilansteuerung 10 durch einen Steuergerätefehler, Kabelbruch oder dergl . wird die Bestro- mung des Regelventils 7 unterbrochen und damit der volle Volumenstrom Basismenge plus Regelmenge A+B eingestellt. Durch Integration der Ventilansteuerung 10 in ein bereits vorhandenes Steuergerät, vorzugsweise das Motorsteuergerät, wird eine kostengünstige Lösung erreicht. Even in the case of a sticking control valve in the closed position, a basic quantity is still available for servo support. This means that most driving maneuvers can be carried out without any problems. Only with extreme steering movements or when parking can there be a loss of comfort. In the event of a failure of the valve control 10 due to a control unit fault, cable break or the like. the pollination Control valve 7 interrupted and thus the full volume flow base quantity plus control quantity A + B set. By integrating the valve control 10 in an already existing control unit, preferably the engine control unit, an inexpensive solution is achieved.

Claims

Patentansprücheclaims
Lenkhelfvorrichtung mit einer Lenkhelfpumpe für ein Fahrzeug mit einem Hydraulikkreislauf (11) mit einem Drehschieberventil (5) und diesem zugeordneten LenkzylinderPower steering device with a power steering pump for a vehicle with a hydraulic circuit (11) with a rotary slide valve (5) and steering cylinder assigned to it
(6) sowie einem Regelventil (7) zum bedarfsabhängigen Einstellen eines Volumenstroms (Q) eines Hydraulikmediums, d a d u r c h g e k e n n z e i c h n e t , dass das Regelventil (7) druckseitig an oder in der Lenkhelfpumpe (1) so angeordnet ist, dass das Regelventil (7) den von der Lenkhelfpumpe (1) angesaugten Volumenstrom(6) and a control valve (7) for adjusting a volume flow (Q) of a hydraulic medium as required, characterized in that the control valve (7) is arranged on the pressure side on or in the power steering pump (1) in such a way that the control valve (7) is adapted from the Power steering pump (1) intake volume flow
(Q) des Hydraulikmediums zumindest in einen ersten Basisteilstrom (A) , der unabhängig vom Betriebszustand des Regelventils (7) ist und einen zweiten Regelteilstrom (B) , der abhängig vom Betriebszustand des Regelventils (7) ist, aufteilt und stromab der Lenkhelfpumpe (1) die beiden Teilströme (A, B) dem Drehschieberventil (5) zugeführt sind.(Q) divides the hydraulic medium into at least a first basic partial flow (A) which is independent of the operating state of the control valve (7) and a second control partial flow (B) which is dependent on the operating state of the control valve (7) and downstream of the power steering pump (1 ) the two partial flows (A, B) are fed to the rotary slide valve (5).
Lenkhelfvorrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , dass das Regelventil (7) im geschlossenen Zustand einenPower steering device according to claim 1, so that the control valve (7) unites in the closed state
Durchfluss in der Größe des Basisteilstroms (A) aufweist.Flow in the size of the base substream (A).
Lenkhelfvorrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , dass das Regelventil (7) im vollständig geöffneten Zustand einen Durchfluss in der Größe der Summe aus Basisteilstrom (A) und maximalem Regelteilstrom (B) aufweist.Power steering device according to claim 1, so that the control valve (7) has a flow in the fully open state of a flow in the size of the sum of the base partial flow (A) and maximum control partial flow (B).
Lenkhelfvorrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , dass überschüssiges Hydraulikmedium im Regelventil (7) einer Überströmleitung (9) zugeführt ist.Power steering device according to claim 1, characterized in that excess hydraulic medium in the control valve (7) is supplied to an overflow line (9).
5. Lenkhelfvorrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , dass das Regelventil (7) im stromlosen Zustand geöffnet ist .5. power steering device according to claim 1, that the control valve (7) is open in the de-energized state.
6. Lenkhelfvorrichtung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , dass eine Zusatzleitung vorgesehen ist, die den ersten Basisteilstrom (A) am Regelventil (7) vorbeileitet.6. power steering device according to claim 1, d a d u r c h g e k e n n z e i c h n e t that an additional line is provided which bypasses the first base partial flow (A) past the control valve (7).
7. Lenkhelfvorrichtung nach Anspruch 6, d a d u r c h g e k e n n z e i c h n e t , dass das Regelventil (7) im geschlossenen Zustand für das Hydraulikmedium gesperrt ist.7. Power steering device according to claim 6, so that the control valve (7) is blocked for the hydraulic medium in the closed state.
8. Lenkhelfvorrichtung nach Anspruch 6, d a d u r c h g e k e n n z e i c h n e t , dass das Regelventil (7) in die Lenkhelfpumpe (1) baulich integriert ist.8. Power steering device according to claim 6, that the control valve (7) is structurally integrated in the power steering pump (1).
9. Verfahren zum Betreiben einer Lenkhelfvorrichtung nach einem der Ansprüche 1 bis 8, d a d u r c h g e k e n n z e i c h n e t , dass der Volumenstrom der Lenkhelfpumpe (7) in einen ersten Basisteilstrom (A) , der unabhängig von einer Fahr- und/oder Regelsituation umgewälzt wird und einen zweiten Regelteilstrom (B) , die abhängig vom Bedarf geregelt wird, aufgeteilt wird.9. A method of operating a power steering device according to one of claims 1 to 8, characterized in that the volume flow of the power steering pump (7) in a first base partial flow (A), which is circulated independently of a driving and / or control situation and a second control partial flow ( B), which is regulated depending on the needs.
10. Verfahren nach Anspruch 9, d a d u r c h g e k e n n z e i c h n e t , dass im stromlosen Zustand des Regelventils (7) der Volumenstrom durch das Regelventil (7) oder parallel zum Regelventil (7) der Basisteilstrom (A) ist. 10. The method according to claim 9, characterized in that in the de-energized state of the control valve (7) the volume flow through the control valve (7) or parallel to the control valve (7) is the base partial flow (A).
11. Verfahren nach Anspruch 9, d a d u r c h g e k e n n z e i c h n e t , dass im bestromten Zustand des Regelventils (7) der Volumenstrom durch aktives Ansteuern des Regelventils (7) bis zum Basisteilstrom (A) heruntergeregelt werden kann.11. The method according to claim 9, so that the volume flow can be regulated down to the base partial flow (A) by actively controlling the control valve (7) when the control valve (7) is energized.
12. Verfahren nach Anspruch 9, d a d u r c h g e k e n n z e i c h n e t , dass das Regelventil (7) bei Geradeausfahrt bestromt wird und nur der Basisteilstrom (A) umgewälzt wird.12. The method according to claim 9, so that the control valve (7) is energized when driving straight ahead and only the base partial stream (A) is circulated.
13. Verfahren nach Anspruch 9, d a d u r c h g e k e n n z e i c h n e t , dass bei einer Lenkbewegung die Bestromung des Regelventils (7) reduziert wird und zusätzlich zum Basisteilstrom13. The method according to claim 9, so that the power supply to the control valve (7) is reduced during a steering movement and in addition to the base partial flow
(A) durch Öffnen des Regelventils (7) der Regelteilstrom(A) by opening the control valve (7) the control part flow
(B) dazugesteuert wird. (B) is controlled.
EP03794865A 2002-08-27 2003-08-09 Power-steering device for a vehicle Withdrawn EP1532034A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10239143A DE10239143A1 (en) 2002-08-27 2002-08-27 Steering assistance device for motor vehicles has an assistance pump with a hydraulic circuit and rotary slide valve with steering cylinder and a control valve to adjust hydraulic volume flow
DE10239143 2002-08-27
PCT/EP2003/008870 WO2004024536A1 (en) 2002-08-27 2003-08-09 Power-steering device for a vehicle

Publications (1)

Publication Number Publication Date
EP1532034A1 true EP1532034A1 (en) 2005-05-25

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ID=31724106

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Application Number Title Priority Date Filing Date
EP03794865A Withdrawn EP1532034A1 (en) 2002-08-27 2003-08-09 Power-steering device for a vehicle

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US (1) US7143862B2 (en)
EP (1) EP1532034A1 (en)
JP (1) JP2005537184A (en)
DE (1) DE10239143A1 (en)
WO (1) WO2004024536A1 (en)

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DE102008019170A1 (en) 2008-04-17 2008-11-27 Daimler Ag Hybrid steering system for motor vehicle, has electrical steering device which comprises electric motor for driving steering rod, and has control valve for operating hydraulic actuator
DE102008026192A1 (en) 2008-05-30 2008-12-18 Daimler Ag Hydraulic steering device for motor vehicle, has electrically actuated control valve for adjusting volume flow of hydraulic unit, where control valve is arranged in bypass and designed for adjusting volume flow that flows through bypass
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Also Published As

Publication number Publication date
DE10239143A1 (en) 2004-03-18
US20050167180A1 (en) 2005-08-04
US7143862B2 (en) 2006-12-05
JP2005537184A (en) 2005-12-08
WO2004024536A1 (en) 2004-03-25

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