WO1990011217A1 - Electro-hydraulic steering assister for motor vehicles - Google Patents

Electro-hydraulic steering assister for motor vehicles Download PDF

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Publication number
WO1990011217A1
WO1990011217A1 PCT/EP1990/000232 EP9000232W WO9011217A1 WO 1990011217 A1 WO1990011217 A1 WO 1990011217A1 EP 9000232 W EP9000232 W EP 9000232W WO 9011217 A1 WO9011217 A1 WO 9011217A1
Authority
WO
WIPO (PCT)
Prior art keywords
hydraulic
steering
electro
steering aid
control device
Prior art date
Application number
PCT/EP1990/000232
Other languages
German (de)
French (fr)
Inventor
Hans-Christof Klein
Hubertus VON GRÜNBERG
Manfred Kahrs
Original Assignee
Alfred Teves Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alfred Teves Gmbh filed Critical Alfred Teves Gmbh
Publication of WO1990011217A1 publication Critical patent/WO1990011217A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
    • B62D6/02—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to vehicle speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
    • B60G17/0195—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by the regulation being combined with other vehicle control systems
    • 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
    • B62D5/07—Supply of pressurised fluid for steering also supplying other consumers ; control thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/40—Steering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
    • B60G2800/90—System Controller type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
    • B60G2800/90—System Controller type
    • B60G2800/92—ABS - Brake Control

Definitions

  • the invention relates to an electro-hydraulic steering aid for motor vehicles according to the preamble of claim 1.
  • a steering aid is known from the French patent specification 2.205.875.
  • a torque detection device is arranged on the steering shaft and connected to an electrical control device, the further input variable of which is the vehicle speed.
  • an electrical control device the further input variable of which is the vehicle speed.
  • a controllable pump is activated, which can be connected to the corresponding working chamber of the working cylinder via switching valves.
  • An electrohydraulically controllable pressure medium pump provided for this use is associated with a very high structural outlay and is cost-intensive. In addition, such a pump device does not allow multiple use for supplying pressure medium to other systems.
  • the invention is therefore based on the object of avoiding the disadvantages of the known steering aid and of creating a generic electrohydraulic steering aid which is distinguished by a simple structure and which can be implemented at low cost.
  • components are to be used which have already proven themselves in automotive hydraulics.
  • This object is achieved by the characterizing features of claim 1.
  • the solution according to the invention enables multiple use of a hydraulic supply unit which is present in the vehicle anyway, in particular the use of a constant pump belonging to a hydraulic brake system. It is particularly advantageous if a hydraulic accumulator is assigned to the hydraulic system, which is automatically kept at a certain pressure level by the pump.
  • a preferred embodiment of the invention includes a priority circuit in favor of the hydraulic brake system.
  • the switching valve arrangement comprises two 2/2-way valves which can be actuated by the electronic control device and are open.
  • the steering aid according to the invention also enables the connection of electronic systems.
  • Sun An embodiment of the invention provides that a common electronic control device is used to control the steering aid, an anti-lock braking system and an adjustable chassis.
  • FIG. 2 shows an embodiment of the invention as a combination with an electronic anti-blocking brake system
  • Fig. 3 is an illustration of the
  • the embodiment of the steering aid according to FIG. 1 has a hydraulic supply unit 1, which is composed of a pump driven by an electric motor, a hydraulic accumulator and a container.
  • the pressure side of the pump is connected via line 2 to the proportional pressure control valve 4, which has a three-way function, a further connection 3 being connected to the hydraulic tank and a third connection by means of line 5 to the working cylinder 6 or the switching valve arrangement 7 is connected.
  • the working cylinder 6 is connected to the mechanical steering as shown in FIG. 2.
  • line section 9, which leads to working chamber 10, is connected to line 5.
  • the line 5 itself is connected to the working chamber 11 of the working cylinder 6, a first 2/2-way valve 12 being arranged between the connection to the working chamber 11 and the branch 8.
  • the container line 14 is connected to the line 5 at the connection point 13.
  • a second 2/2-way valve 16 is provided in the container line 14 between the connection point 13 and the container 15.
  • the two directional control valves 12 and 16 are each designed as normally open solenoid valves and are switched by the electronic control device 17 depending on the direction of rotation of the steering wheel.
  • the working cylinder 6 is designed as a so-called differential cylinder, i.e. the cross-sectional area of the piston rod is 50% of the cross-sectional area of the piston. If the working piston is to be displaced in the direction of the piston rod, then the second 2/2-way valve 16 is closed, while the first 2/2-way valve 12 remains in its open position. If, on the other hand, the piston rod is to be retracted into the working cylinder, the first 2/2-way valve 12 is closed and the working chamber 11 is connected to the container 15 by the opened second 2/2-way valve 16.
  • each working chamber would be assigned a normally open 2/2-way valve in the connection to the pump or to the proportional pressure regulator and a normally closed 2/2-way valve in the connection to the container.
  • the proportional pressure control valve 4 is also controlled by the electronic control device 17; depending on the amount of torque applied to the steering wheel.
  • the electronic control device 17 is connected by means of the electrical connection 18 to a torque sensor attached to the steering wheel, which detects the direction of rotation and the amount of the applied torque and supplies a corresponding input signal for the electronic control unit 17.
  • the electrical connections 19 and 20 lead from the electronic control device 17 to the battery or to the ignition lock, so that the steering aid including the pump can only be actuated when the ignition system is switched on. Electrical connections (not shown) for control and monitoring exist between the electronic control unit 17 and the hydraulic supply unit. It is thus possible, for example, to switch on the pump each time the steering is actuated, so that only a very small volume portion is always removed from the hydraulic accumulator.
  • a common hydraulic supply unit is used both for the steering aid and for another hydraulic system available to the vehicle, since the electronic control device 17 also activates the system in the event of a pump failure lower priority is prevented and the almost complete storage volume is then available to the system with higher priority.
  • the electromagnetically actuated proportional pressure control valve controls a hydraulic pressure in line 5 which is proportional to the electrical output signal of the electronic control device 17. This electrical signal not only depends on the level of the torque determined by the torque sensor on the steering shaft, but is also influenced by other control variables which depend on the driving dynamics of the vehicle.
  • Such control variables are, for example, the vehicle speed, accelerations in the longitudinal or transverse direction, distribution of the drive or braking torques to the front and rear axles, vehicle loading and distribution of the same to the individual axles, etc.
  • the hydraulic steering assistance can be adapted to the vehicle-specific requirements and it there is, for example, greater steering assistance at a lower driving speed than at a higher speed.
  • the linking of various electronically controlled systems not only serves to adapt the hydraulic steering support, it also enables the other systems to be influenced by the steering.
  • FIG. 2 shows a representation of the electrohydraulic steering aid in combination with an electronically controlled anti-lock brake system.
  • the structure and function essentially correspond to the embodiment according to FIG. 1.
  • the pump 21, which serves as a common supply unit for the brake and power steering is driven by the electric motor 22, the hydraulic accumulator 23 and the container 14.
  • the torque sensor 24 is arranged in the steering wheel hub, for which purpose a torsionally elastic element with centering and a small angle of rotation of approximately 2 degrees at maximum torque is provided, which actuates a potentiometer.
  • torque transducers based on the strain gauge are also suitable.
  • the proportional pressure control valve 4 and the switching valve arrangement 7 are combined in a valve block 25.
  • the electric line 26 is used to switch the electric motor 22, while the electrical connection 27 is used for pump monitoring.
  • the electrical connections 28 are provided for the input and output of further control variables, various electronically controlled systems being able to influence one another in a suitable manner.
  • the 3 shows details of the proportional pressure control valve 4. It essentially consists of the electromagnetic control 25 and a longitudinal slide 31 provided in a housing 30.
  • the electromagnetic control 29 has a proportional magnet which, when subjected to electrical loads, causes the longitudinal slide 31 to be displaced from the rest position shown with a force proportional to the electrical current. During this shift, the return spring 32 is compressed.
  • the consumer connection 33 which is connected to the line 5
  • the container connection 34 to which the connection 3 is connected.
  • the pump connection 35 which is connected to the outlet of the pump by means of the line 2, is closed by the longitudinal slide 31, whereby a very low leakage is achieved.
  • the pressure building up in the consumer connection 31 counteracts the longitudinal slide and the magnetic force.
  • This hydraulic reaction is achieved by a pin 39 which is slidably guided with a precise fit in the longitudinal bore 37 and by means of which the pressure force can be supported on the locking screw fixed to the housing.
  • the small cross-sectional area of the pin enables the use of a comparatively small magnet.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Automation & Control Theory (AREA)
  • Power Steering Mechanism (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Steering Control In Accordance With Driving Conditions (AREA)

Abstract

The proposal is for an electro-hydraulic steering assister with a measuring device to detect the steering moment applied by the driver, an electronic control device (17), a hydraulic supply unit (1), a pilot valve arrangement (7) and a working cylinder (6) coupled to the mechanical steering gear, the working chambers (10, 11) of which can be pressurised depending on the steering direction, whereby the pilot valve arrangement is controlled by the electronic control device. In order to match the hydraulic assistance simply, economically and in the best possible way to the dynamic driving conditions, a proportional pressure control valve (4) is fitted in the connection between the hydraulic supply unit (1) and the working cylinder (6) which can be controlled by the electronic control device (17).

Description

Elektrohydraulische Lenkhilfe für KraftfahrzeugeElectro-hydraulic steering aid for motor vehicles
Die Erfindung betrifft eine elektrohydraulische Lenkhilfe für Kraftfahrzeuge nach dem Oberbegriff des Anspruches 1. Eine derartige Lenkhilfe ist aus der französischen Patentschrift 2.205.875 bekannt.The invention relates to an electro-hydraulic steering aid for motor vehicles according to the preamble of claim 1. Such a steering aid is known from the French patent specification 2.205.875.
Bei der bekannten Lenkhilfe ist eine Drehmomenter- fassungsvorrichung an der Lenkwelle angeordnet und mit einer elektrischen Steuereinrichtung verbunden, deren weitere Eingangsgröße die Fahrzeuggeschwindigkeit ist. In Abhängigkeit von diesen beiden Eingangsgrößen wird eine regelbare Pumpe angesteuert, welche über Schaltventile mit der entsprechenden Arbeitskammer des ArbeiteZylinders verbindbar ist.In the known steering aid, a torque detection device is arranged on the steering shaft and connected to an electrical control device, the further input variable of which is the vehicle speed. Depending on these two input variables, a controllable pump is activated, which can be connected to the corresponding working chamber of the working cylinder via switching valves.
Eine für diese Verwendung vorgesehene elektrohydraulisch regelbare Druckmittelpumpe ist mit einem sehr hohen bau¬ lichen Aufwand verbunden und kostenintensiv. Außerdem läßt eine derartige Pumpenvorrichtung keine mehrfache Nutzung zur Druckmittelversorgung weiterer Systeme zu.An electrohydraulically controllable pressure medium pump provided for this use is associated with a very high structural outlay and is cost-intensive. In addition, such a pump device does not allow multiple use for supplying pressure medium to other systems.
Der Erfindung liegt daher die Aufgabe zugrunde, die Nachteile der bekannten Lenkhilfe zu vermeiden und eine gattungsgemäße elektrohydraulische Lenkhilfe zu schaffen, die sich durch einen einfachen Aufbau auszeichnet und die mit geringem Kostenaufwand realisierbar ist. Insbesondere sollen Bauteile verwendet werden, die sich bereits in der Kraftfahrzeughydraulik bewährt haben. Diese Aufgabe wird durch die kennzeichnenden Merkmale des Anspruches 1 gelöst. Die erfindungsgemäße Lösung ermöglicht die mehrfache Nutzung einer ohnehin im Fahrzeug vorhandenen hydrau¬ lischen Versorgungseinheit, insbesondere die Nutzung einer zu einem hydraulischen Bremssystem gehörenden Konstantpumpe. Dabei ist es von besonderem Vorteil, wenn dem Hydrauliksystem ein Hydrospeicher zugeordnet ist, welcher durch die Pumpe automatisch auf einem bestimmten Druckniveau gehalten wird.The invention is therefore based on the object of avoiding the disadvantages of the known steering aid and of creating a generic electrohydraulic steering aid which is distinguished by a simple structure and which can be implemented at low cost. In particular, components are to be used which have already proven themselves in automotive hydraulics. This object is achieved by the characterizing features of claim 1. The solution according to the invention enables multiple use of a hydraulic supply unit which is present in the vehicle anyway, in particular the use of a constant pump belonging to a hydraulic brake system. It is particularly advantageous if a hydraulic accumulator is assigned to the hydraulic system, which is automatically kept at a certain pressure level by the pump.
Eine bevorzugte Ausführungsform der Erfindung beinhaltet eine PrioritätsSchaltung zu Gunsten des hydraulischen BremsSystems. Om eine manuelle Betätigung der Lenkung bei Ausfall der elektrischen Versorgung sicherzustellen, ist vorgesehen, daß die Schaltventilanordnung zwei von der elektronischen Steuereinrichtung betätigbare strom¬ los offene 2/2-Wegeventile umfaßt.A preferred embodiment of the invention includes a priority circuit in favor of the hydraulic brake system. In order to ensure manual actuation of the steering in the event of a power failure, it is provided that the switching valve arrangement comprises two 2/2-way valves which can be actuated by the electronic control device and are open.
Die erfindungsgemäße Lenkhilfe ermöglicht neben der mehrfachen Nutzung bereits vorhandener hydraulischer Komponenten auch die Verknüpfung elektronischer Systeme. So. sieht eine Ausführungsform der Erfindung vor, daß eine gemeinsame elektronische Steuereinrichtung der Steuerung der Lenkhilfe, einer Antiblockierbremsanlage und eines regelbaren Fahrwerkes dient.In addition to the multiple use of already existing hydraulic components, the steering aid according to the invention also enables the connection of electronic systems. Sun An embodiment of the invention provides that a common electronic control device is used to control the steering aid, an anti-lock braking system and an adjustable chassis.
Weitere vorteilhafte Merkmale sowie die Funktion der Erfindung ergeben sich aus der nachstehenden Be¬ schreibung anhand der Zeichnung. Hierzu zeigt:Further advantageous features and the function of the invention result from the description below with reference to the drawing. This shows:
Fig. 1 eine schematische Darstellung der Lenkhilfe,1 is a schematic representation of the steering aid,
Fig. 2 eine Ausführungsform der Erfindung als Kombination mit einer elektronischen Antiblockierbre sanlage,2 shows an embodiment of the invention as a combination with an electronic anti-blocking brake system,
Fig. 3 eine Darstellung desFig. 3 is an illustration of the
Porportional- Druckregelventils.Proportional pressure control valve.
Die Ausführungsform der Lenkhilfe gemäß Fig. 1 weist eine hydraulische Versorgungseinheit 1 auf, die sich aus einer von einem Elektromotor angetriebenen Pumpe, einem Hydrospeicher und einem Behälter zusammensetzt. Die Druckseite der Pumpe ist über die Leitung 2 mit dem Proportional-Druckregelventil 4 verbunden, welches eine Dreiwege-Funktion hat, wobei eine weitere Verbindung 3 mit dem Hydraulikbehälter verbunden ist und ein dritter Anschluß mittels der Leitung 5 an den Arbeitszylinder 6 bzw. die Schaltventilanordnung 7 angeschlossen ist. Der Arbeitezylinder 6 ist wie aus Fig. 2 hervorgeht mit der mechanischen Lenkung verbunden.The embodiment of the steering aid according to FIG. 1 has a hydraulic supply unit 1, which is composed of a pump driven by an electric motor, a hydraulic accumulator and a container. The pressure side of the pump is connected via line 2 to the proportional pressure control valve 4, which has a three-way function, a further connection 3 being connected to the hydraulic tank and a third connection by means of line 5 to the working cylinder 6 or the switching valve arrangement 7 is connected. The working cylinder 6 is connected to the mechanical steering as shown in FIG. 2.
Am Abzweig 8 ist der Leitungsabschnitt 9, welcher zur Arbeitskammer 10 führt, an die Leitung 5 angeschlossen. Die Leitung 5 selbst ist mit der Arbeitskammer 11 des ArbeitsZylinders 6 verbunden, wobei zwischen dem An¬ schluß an die Arbeitskammer 11 und dem Abzweig 8 ein erstes 2/2-Wegeventil 12 angeordnet ist. Zwischen dem ersten 2/2-Wegeventil 12 und dem Arbeitszylinder 6 ist am Anschlußpunkt 13 die Behälterleitung 14 an die Leitung 5 angeschlossen. In der Behälterleitung 14 ist zwischen dem Anschlußpunkt 13 und dem Behälter 15 ein zweites 2/2-Wegeventil 16 vorgesehen. Die beiden Wege¬ ventile 12 und 16 sind jeweils als stromlos offene Magnetventile ausgeführt und werden durch die elektronische Steuereinrichtung 17 in Abhängigkeit von der Drehrichtung des Lenkrades geschaltet.At branch 8, line section 9, which leads to working chamber 10, is connected to line 5. The line 5 itself is connected to the working chamber 11 of the working cylinder 6, a first 2/2-way valve 12 being arranged between the connection to the working chamber 11 and the branch 8. Is between the first 2/2-way valve 12 and the working cylinder 6 the container line 14 is connected to the line 5 at the connection point 13. A second 2/2-way valve 16 is provided in the container line 14 between the connection point 13 and the container 15. The two directional control valves 12 and 16 are each designed as normally open solenoid valves and are switched by the electronic control device 17 depending on the direction of rotation of the steering wheel.
Der Arbeitszylinder 6 ist als sogenannter Differential- zylinder ausgeführt, d.h. die Querschnittsfläche der Kolbenstange beträgt 50% der Querschnittsfläche des Kolbens. Soll der Arbeitskolben in Richtung der Kolben¬ stange verschoben werden, so wird das zweite 2/2-Wege- ventil 16 geschlossen, während das erste 2/2-Wegeventil 12 in seiner Offenstellung bleibt. Soll die Kolbenstange dagegen in den Arbeitszylinder eingefahren werden, so wird das erste 2/2-Wegeventil 12 geschlossen und die Arbeitskammer 11 ist durch das geöffnete zweite 2/2-Wegeventil 16 mit dem Behälter 15 verbunden.The working cylinder 6 is designed as a so-called differential cylinder, i.e. the cross-sectional area of the piston rod is 50% of the cross-sectional area of the piston. If the working piston is to be displaced in the direction of the piston rod, then the second 2/2-way valve 16 is closed, while the first 2/2-way valve 12 remains in its open position. If, on the other hand, the piston rod is to be retracted into the working cylinder, the first 2/2-way valve 12 is closed and the working chamber 11 is connected to the container 15 by the opened second 2/2-way valve 16.
Soll die Lenkhilfe mit einem als Gleichlaufzylinder mit durchgehender Kolbenstange ausgebildeten Arbeitszylinder ausgeführt werden, d.h. die druckbeaufschlagbaren Flächen des Kolbens sind für beide Arbeitskammern gleich groß, so ist eine abgeänderte Schaltventilanordnung vor¬ zusehen. Beispielsweise wäre jeder Arbeitskammer ein stromlos offenes 2/2-Wegeventil in der Verbindung zur Pumpe bzw. zum Proportionaldruckregeventil und ein stromlos geschlossenes 2/2-Wegeventil in der Verbindung zum Behälter zuzuordnen. Das Proportional-Druckregelventil 4 wird ebenfalls durch die elektronische Steuereinrichtung 17 angesteuert; und zwar in Abhängigkeit von der Höhe des auf das Lenkrad aufgebrachten Drehmomentes. Die elektronische Steuer¬ einrichtung 17 ist mittels der elektrischen Verbindung 18 an einen am Lenkrad angebrachten Drehmomentsensor an¬ geschlossen, welcher Drehrichtung und Höhe des aufge¬ brachten Drehmomentes detektiert und ein entsprechendes Eingangssignal für die elektronische Steuereinheit 17 liefert. Die elektrischen Verbindungen 19 und 20 führen von der elektronischen Steuereinrichtung 17 zur Batterie bzw. zum Zündschloß, so daß die Lenkhilfe inclusive Pumpe nur bei eingeschalteter Zündanlage betätigbar ist. Zwischen der elektronischen Steuereinheit 17 und der hydraulischen Versorgungseinheit bestehen nicht darge¬ stellte elektrische Verbindungen zur Ansteuerung und Überwachung. Somit ist es beispielsweise möglich, bei jeder Lenkbetätigung die Pumpe einzuschalten, so daß stets nur ein sehr geringer Volumenanteil aus dem Hydraulikspeicher entnommen wird.If the steering aid is to be designed with a working cylinder designed as a synchronous cylinder with a continuous piston rod, ie the pressurizable surfaces of the piston are of the same size for both working chambers, a modified switching valve arrangement must be provided. For example, each working chamber would be assigned a normally open 2/2-way valve in the connection to the pump or to the proportional pressure regulator and a normally closed 2/2-way valve in the connection to the container. The proportional pressure control valve 4 is also controlled by the electronic control device 17; depending on the amount of torque applied to the steering wheel. The electronic control device 17 is connected by means of the electrical connection 18 to a torque sensor attached to the steering wheel, which detects the direction of rotation and the amount of the applied torque and supplies a corresponding input signal for the electronic control unit 17. The electrical connections 19 and 20 lead from the electronic control device 17 to the battery or to the ignition lock, so that the steering aid including the pump can only be actuated when the ignition system is switched on. Electrical connections (not shown) for control and monitoring exist between the electronic control unit 17 and the hydraulic supply unit. It is thus possible, for example, to switch on the pump each time the steering is actuated, so that only a very small volume portion is always removed from the hydraulic accumulator.
Dies ist insbesondere dann von Vorteil, wenn - wie in Fig. 2 dargestellt - eine gemeisame Hydraulikver¬ sorgungseinheit sowohl für die Lenkhilfe als auch für ein anderes dem Fahrzeug vorhandenes Hydrauliksystem genutzt wird, da die elektronische Steuereinrichtung 17 beispielsweise bei Pumpenausfall die Aktivierung des Systems mit niedrigerer Priorität verhindert und damit das fast komplette Speichervolumen dann dem System mit höherer Priorität zur Verfügung steht. Das elektromagnetisch betätigbare Proportional-Druck¬ regelventil steuert in die Leitung 5 einen dem elektrischen Ausgangssignal der elektronischen Steuer¬ einrichtung 17 proportionalen hydraulischen Druck ein. Dieses elektrische Signal hängt nicht nur von der Höhe des vom Drehmomentsensor an der Lenkwelle ermittelten Drehmomentes ab, sondern wird außerdem noch von weiteren Steuergrößen beeinflußt, welche vom fahrdynamischen Zustand des Fahrzeuges abhängen. Solche Steuergrößen sind beispielsweise die Fahrzeuggeschwindigkeit, Beschleunigungen in Längs- oder Querrichtung, Verteilung der Antriebs- oder Bremsmomente auf die Vorder- und Hinterachse, Fahrzeugbeladung und Verteilung derselben auf die einzelnen Achsen usw.. Somit läßt sich die hydrauliche Lenkunterstützung den fahrzeugspezifischen Erfordernissen anpassen und es erfolgt beispielsweise bei niedriger Fahrgeschwindigkeit eine stärkere Lenkkraftunterstützung als bei höherer Geschwindigkeit.This is particularly advantageous if, as shown in FIG. 2, a common hydraulic supply unit is used both for the steering aid and for another hydraulic system available to the vehicle, since the electronic control device 17 also activates the system in the event of a pump failure lower priority is prevented and the almost complete storage volume is then available to the system with higher priority. The electromagnetically actuated proportional pressure control valve controls a hydraulic pressure in line 5 which is proportional to the electrical output signal of the electronic control device 17. This electrical signal not only depends on the level of the torque determined by the torque sensor on the steering shaft, but is also influenced by other control variables which depend on the driving dynamics of the vehicle. Such control variables are, for example, the vehicle speed, accelerations in the longitudinal or transverse direction, distribution of the drive or braking torques to the front and rear axles, vehicle loading and distribution of the same to the individual axles, etc. Thus, the hydraulic steering assistance can be adapted to the vehicle-specific requirements and it there is, for example, greater steering assistance at a lower driving speed than at a higher speed.
Die Verknüpfung verschiedener elektronisch gesteuerter Systeme dient nicht nur der Anpassung der hydraulichen Lenkunterstützung sondern es wird auch die Beeinflussung der anderen Systeme durch die Lenkung ermöglicht.The linking of various electronically controlled systems not only serves to adapt the hydraulic steering support, it also enables the other systems to be influenced by the steering.
Fig. 2 zeigt eine Darstellung der elektrohydraulischen Lenkhilfe in Kombination mit einem elektronisch ge¬ steuerten AntiblockierbremsSystem. Aufbau und Funktion entspricht hierbei im wesentlichen der Ausführungsform gemäß Fig. 1. Als gemeinsame Versorgungseinheit für Bremse und Hilfskraftlenkung dient die Pumpe 21, welche vom Elektromotor 22 angetrieben wird, der Hydrospeicher 23 und der Behälter 14. Der Drehmomentsensor 24 ist in der Lenkradnabe angeordnet, wozu ein drehelastisches Element mit Mittenzentrierung und kleinem Verdrehwinkel von etwa _ 2 Grad bei maximalem Drehmoment vorge¬ sehen ist, welches ein Potentiometer betätigt. Selbst¬ verständlich kommen auch Drehmomentaufnehmer auf den Dehnungsmeßstreifen-Basis in Frage.2 shows a representation of the electrohydraulic steering aid in combination with an electronically controlled anti-lock brake system. The structure and function essentially correspond to the embodiment according to FIG. 1. The pump 21, which serves as a common supply unit for the brake and power steering is driven by the electric motor 22, the hydraulic accumulator 23 and the container 14. The torque sensor 24 is arranged in the steering wheel hub, for which purpose a torsionally elastic element with centering and a small angle of rotation of approximately 2 degrees at maximum torque is provided, which actuates a potentiometer. Of course, torque transducers based on the strain gauge are also suitable.
Das Proportional-Druckregelventil 4 sowie die Schalt¬ ventilanordnung 7 ist in einem Ventilblock 25 zusammen¬ gefaßt. Die Elektroleitung 26 dient dem Schalten des Elektromotors 22, während die elektrische Verbindung 27 der Pumpenüberwachung dient. Die elektrischen Anschlüsse 28 sind für die Ein- und Ausgabe weiterer Steuergrößen vorgesehen, wobei sich verschiedene elektronisch ge¬ steuerte Systeme in geeigneter Weise beeinflussen können.The proportional pressure control valve 4 and the switching valve arrangement 7 are combined in a valve block 25. The electric line 26 is used to switch the electric motor 22, while the electrical connection 27 is used for pump monitoring. The electrical connections 28 are provided for the input and output of further control variables, various electronically controlled systems being able to influence one another in a suitable manner.
Der Fig. 3 können Einzelheiten des Proportional-Druck¬ regelventils 4 entnommen werden. Es setzt sich im wesentlichen aus der elektromagnetischen Ansteuerung 25 und einem in einem Gehäuse 30 vorgesehenen Längsschieber 31 zusammen. Die elektromagnetische Ansteuerung 29 weist einen Proportionalmagneten auf, der bei elektrischer Beaufschlagung ein Verschieben des LängsSchiebers 31 aus der dargestellten Ruhelage mit einer dem elektrischen Strom proportionalen Kraft bewirkt. Bei dieser Ver¬ schiebung wird die Rückholfeder 32 komprimiert. So lange sich der Längsschieber 31 in Ruhelage befindet, ist der Verbraucheranschluß 33, der mit der Leitung 5 verbunden ist, mit dem Behälteranschluß 34 verbunden, an welchen die Verbindung 3 angeschlossen ist. Der Pumpenanschluß 35, der mittels der Leitung 2 mit dem Ausgang der Pumpe verbunden ist, ist durch den Längsschieber 31 ver¬ schlossen, wodurch eine sehr niedrige Leckage erreicht wird. Ein Verschieben des Längsschiebers 31 durch die Kraft des Proportionalmagneten gegen die Kraft der Rück¬ holfeder 32 wird zunächst die Verbindung zwischen dem Verbraucheranschluß 33 und dem Behälteranschluß 34 geschlossen und danach der Pumpenanschluß 35 durch die Querbohrung 36, die Längsbohrung 37 und die zweite Quer¬ bohrung 38 mit dem Verbraucheranschluß 33 verbunden.3 shows details of the proportional pressure control valve 4. It essentially consists of the electromagnetic control 25 and a longitudinal slide 31 provided in a housing 30. The electromagnetic control 29 has a proportional magnet which, when subjected to electrical loads, causes the longitudinal slide 31 to be displaced from the rest position shown with a force proportional to the electrical current. During this shift, the return spring 32 is compressed. As long as the longitudinal slide 31 is in the rest position, the consumer connection 33, which is connected to the line 5, is connected to the container connection 34, to which the connection 3 is connected. The pump connection 35, which is connected to the outlet of the pump by means of the line 2, is closed by the longitudinal slide 31, whereby a very low leakage is achieved. Moving the longitudinal slide 31 by the force of the proportional magnet against the force of the return spring 32 first closes the connection between the consumer connection 33 and the container connection 34 and then the pump connection 35 through the transverse bore 36, the longitudinal bore 37 and the second transverse bore 38 connected to the consumer connection 33.
Der sich im Verbraucheranschluß 31 aufbauende Druck wirkt auf den Längsschieber und der Magnetkraft ent¬ gegen. Diese hydraulische Rückwirkung wird durch einen Stift 39 erreicht, der gleitbar mit genauer Passung in der Längsbohrung 37 geführt ist und über welchen sich die Druckkraft an der gehäusefesten Verschlußschraube abstützen kann. Durch die geringe Querschnittsfläche des Stiftes wird die Verwendung eines vergleichsweise kleinen Magneten ermöglicht. Durch den Ausgleich der verstellbaren Magnetkraft mit der am Schieber wirksamen Druckkraft ist eine genaue Druckregelung im Verbraucher¬ anschluß 33 möglich. Zwei elektrische Schalter 41 dienen der Überwachung der Schieberendstellung. The pressure building up in the consumer connection 31 counteracts the longitudinal slide and the magnetic force. This hydraulic reaction is achieved by a pin 39 which is slidably guided with a precise fit in the longitudinal bore 37 and by means of which the pressure force can be supported on the locking screw fixed to the housing. The small cross-sectional area of the pin enables the use of a comparatively small magnet. By balancing the adjustable magnetic force with the pressure force acting on the slide, precise pressure control in the consumer connection 33 is possible. Two electrical switches 41 are used to monitor the slide end position.
BezugszeichenlisteReference list
1 Versorgungseinheit1 supply unit
2 Leitung2 line
3 Verbindung3 connection
4 Proportional-Druckregelventil4 proportional pressure control valve
5 Leitung5 line
6 Arbeitszylinder6 working cylinders
7 Schaltventilanordnung7 switching valve arrangement
8 Abzweig8 branch
9 Leitungsabschnitt9 line section
10 Arbeitskammer10 working chamber
11 Arbeitskammer11 working chamber
12 erstes 2/2-Wegeventil12 first 2/2-way valve
13 Anschlußpunkt13 connection point
14 Behälterleitung14 tank line
15 Behälter15 containers
16 zweites 2/2-Wegeventil16 second 2/2-way valve
17 elektronische Steuereinrichtung17 electronic control device
18 elektrische Leitung18 electrical wire
19 elektrische Verbindung19 electrical connection
20 elektrische Verbindung20 electrical connection
21 Pumpe21 pump
22 Elektromotor22 electric motor
23 Hydrospeicher23 hydraulic accumulators
24 Drehmomentsensor24 torque sensor
25 Ventilblock25 valve block
26 Elektroleitung - 10 -26 Electric wire - 10 -
elektrische Verbindung elektrische Anschlüsse elektromagnetische Ansteuezning Gehäuse Längsschieber Rückholfeder Verbraucheranschluß Behälteranschluß Pumpenanschluß Querbohrung Längsbohrung zweite Querbohrung Stift Verschlußschraube Schalter electrical connection electrical connections electromagnetic control housing longitudinal slide return spring consumer connection container connection pump connection cross bore longitudinal bore second cross bore pin locking screw switch

Claims

Patentansprüche Claims
1. Elektrohydraulische Lenkhilfe für Kraftfahrzeuge mit einer Meßeinrichtung zur Erfassung des vom Fahrer auf eine Lenkwelle aufgebrachten Momentes, einer elektronischen Steuereinrichtung, einer hydraulischen Versorgungseinheit, einer aus mindestens einem Schalt¬ ventil bestehenden Schaltventilanordnung, einem Arbeitszylinder, welcher an die mechanische Lenkung angekoppelt ist und dessen Arbeitskammern in Abhängig¬ keit von der Lenkrichtung von der Schaltventilan¬ ordnung gesteuert druckbeaufschlagbar sind, wobei die Steuerung der Schaltventilanordnung durch die elek¬ tronische Steuereinrichtung erfolgt, dadurch g e ¬ k e n n z e i c h n e t, daß in der Verbindung (5) zwischen der hydraulischen Versorgungseinheit (1,15,21,22,23) und dem Arbeitszylinder (6) ein Porportional-Druckregelventil (7) angeordnet ist, welches von der elektronischen Steuereinrichtung (17) ansteuerbar ist.1.Electrohydraulic steering aid for motor vehicles with a measuring device for detecting the torque applied by the driver to a steering shaft, an electronic control device, a hydraulic supply unit, a switching valve arrangement consisting of at least one switching valve, a working cylinder which is coupled to the mechanical steering and the like Working chambers depending on the steering direction can be pressurized by the switching valve arrangement, the switching valve arrangement being controlled by the electronic control device, characterized in that in connection (5) between the hydraulic supply unit (1,15 , 21, 22, 23) and the working cylinder (6) a proportional pressure control valve (7) is arranged, which can be controlled by the electronic control device (17).
2. Elektrohydraulische Lenkhilfe nach Anspruch 1, da¬ durch g e k e n n z e i c h n e t, daß zur hydrau¬ lischen Versorgung die Versorgungseinheit (15,21,22,23) eines oder mehrerer anderer Hydraulik¬ systeme, insbesondere eines hydraulischen Brems¬ systems, an die Lenkhilfe angeschlossen ist. 2. Electro-hydraulic steering aid according to claim 1, characterized in that the supply unit (15, 21, 22, 23) of one or more other hydraulic systems, in particular a hydraulic braking system, is connected to the steering aid for the hydraulic supply .
3. Elektrohydraulische Lenkhilfe nach Anspruch 1, dadurch g e k e n n z e i c h n e t, daß der Arbeits¬ zylinder als Differentialzylinder ausgebildet ist.3. Electro-hydraulic steering aid according to claim 1, characterized in that the working cylinder is designed as a differential cylinder.
4. Elektrohydraulische Lenkhilfe nach einem der vorher¬ gehenden Ansprüche, dadurch g e k e n n z e i c h ¬ n e t, daß als Schaltventilanordnung (7) zwei stromlos offene, elektromagnetisch betätigbare 2/2-Wegeventile (12,16) vorgesehen sind.4. Electro-hydraulic steering aid according to one of the preceding claims, characterized in that two normally open, electromagnetically actuated 2/2-way valves (12, 16) are provided as the switching valve arrangement (7).
5. Elektrohydraulische Lenkhilfe nach einem der vorher¬ gehenden Ansprüche, dadurch g e k e n n z e i c h ¬ n e t, daß die elektronische Steuereinrichtung (17) sowohl der Steuerung der Lenkhilfe als auch der Steuerung einer Antiblockier-Bremsanlage dient.5. Electro-hydraulic steering aid according to one of the preceding claims, characterized in that the electronic control device (17) serves both to control the steering aid and to control an anti-lock braking system.
6. Elektrohydraulische Lenkhilfe nach einem der vorher¬ gehenden Ansprüche, dadurch g e k e n n z e i c h ¬ n e t, daß die elektronische Steuereinrichtung (17) der Steuerung der Lenkhilfe, der elektronischen Antiblockier-Bremsanlage und eines regelbaren Fahrwerkes dient.6. Electro-hydraulic steering aid according to one of the preceding claims, characterized in that the electronic control device (17) serves to control the steering aid, the electronic anti-lock braking system and a controllable undercarriage.
7. Elektrohydraulische Lenkhilfe nach einem der vorher¬ gehenden Ansprüche, dadurch g e k e n n z e i c h ¬ n e t, daß eine PrioritatsSchaltung vorgesehen ist, die der Bremsanlage stets Vorrang einräumt. 7. Electro-hydraulic steering aid according to one of the preceding claims, characterized in that a priority circuit is provided which always gives priority to the braking system.
8. Elektrohydraulische Lenkhilfe nach einem der vorher¬ gehenden Ansprüche, dadurch g e k e n n z e i c h ¬ n e t, daß als Druckmittel Bremsflüssigkeit verwende wird. 8. Electro-hydraulic steering aid according to one of the preceding claims, characterized in that brake fluid is used as the pressure medium.
PCT/EP1990/000232 1989-03-21 1990-02-14 Electro-hydraulic steering assister for motor vehicles WO1990011217A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3909210.0 1989-03-21
DE19893909210 DE3909210A1 (en) 1989-03-21 1989-03-21 ELECTROHYDRAULIC STEERING AID FOR MOTOR VEHICLES

Publications (1)

Publication Number Publication Date
WO1990011217A1 true WO1990011217A1 (en) 1990-10-04

Family

ID=6376834

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1990/000232 WO1990011217A1 (en) 1989-03-21 1990-02-14 Electro-hydraulic steering assister for motor vehicles

Country Status (4)

Country Link
EP (1) EP0425594A1 (en)
JP (1) JPH03504710A (en)
DE (1) DE3909210A1 (en)
WO (1) WO1990011217A1 (en)

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EP0512358A1 (en) * 1991-05-06 1992-11-11 FIAT AUTO S.p.A. A system for controlling the load on an antiroll stabiliser bar associated with an independent suspension system for a motor vehicle
EP0551479A1 (en) * 1991-07-30 1993-07-21 Aura Systems, Inc. Variable assist gain control apparatus for a servo-assist system
EP0665157A1 (en) * 1993-12-22 1995-08-02 CENTRO RICERCHE FIAT Società Consortile per Azioni Power-steering device for motor-vehicles

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DE4205272B4 (en) * 1992-02-21 2005-05-04 Claas Kgaa Mbh Measuring device of a control device of a variable V belt drive
DE4230957A1 (en) * 1992-09-16 1994-03-17 Zahnradfabrik Friedrichshafen Rack and pinion power steering, in particular for motor vehicles
DE102019006078A1 (en) * 2019-08-28 2021-03-04 Man Truck & Bus Se Power steering assistance for a motor vehicle

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EP0512358A1 (en) * 1991-05-06 1992-11-11 FIAT AUTO S.p.A. A system for controlling the load on an antiroll stabiliser bar associated with an independent suspension system for a motor vehicle
EP0551479A1 (en) * 1991-07-30 1993-07-21 Aura Systems, Inc. Variable assist gain control apparatus for a servo-assist system
EP0551479A4 (en) * 1991-07-30 1995-03-01 Aura Systems Inc Variable gain servo assist
EP0665157A1 (en) * 1993-12-22 1995-08-02 CENTRO RICERCHE FIAT Società Consortile per Azioni Power-steering device for motor-vehicles

Also Published As

Publication number Publication date
JPH03504710A (en) 1991-10-17
DE3909210A1 (en) 1990-09-27
EP0425594A1 (en) 1991-05-08

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