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WO2003047949A1 - Systeme de direction steer by wire a double circuit comportant deux organes de reglage hydraulique - Google Patents

Systeme de direction steer by wire a double circuit comportant deux organes de reglage hydraulique Download PDF

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Publication number
WO2003047949A1
WO2003047949A1 PCT/EP2002/013604 EP0213604W WO03047949A1 WO 2003047949 A1 WO2003047949 A1 WO 2003047949A1 EP 0213604 W EP0213604 W EP 0213604W WO 03047949 A1 WO03047949 A1 WO 03047949A1
Authority
WO
WIPO (PCT)
Prior art keywords
steer
steering
actuating
wire steering
wire
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.)
Ceased
Application number
PCT/EP2002/013604
Other languages
German (de)
English (en)
Inventor
Karsten Sikora
Jochen Horwath
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.)
ThyssenKrupp Presta Muelheim GmbH
Original Assignee
Mercedes Benz Lenkungen GmbH
ThyssenKrupp Presta Steertec 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 Mercedes Benz Lenkungen GmbH, ThyssenKrupp Presta Steertec GmbH filed Critical Mercedes Benz Lenkungen GmbH
Publication of WO2003047949A1 publication Critical patent/WO2003047949A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B62D5/001—Mechanical components or aspects of steer-by-wire systems, not otherwise provided for in this maingroup
    • 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
    • B62D5/001—Mechanical components or aspects of steer-by-wire systems, not otherwise provided for in this maingroup
    • B62D5/003—Backup systems, e.g. for manual steering

Definitions

  • the present invention relates to a two-circuit steer-by-wire steering system with two hydraulically operated actuators.
  • Steering systems which have two actuating units for adjusting the steerable wheels.
  • the actuating units of these steering systems are dimensioned in such a way that both actuating units work together in normal driving operation, ie both actuating units exert approximately the same force. Due to the simultaneous operation of both actuators, the actuators and their steering circuits can be made smaller. In the event of a steering circuit failure or Actuating unit, the still functioning other actuating unit can just adjust the wheels, which means that restricted driving is still possible.
  • Such systems are either designed with one circuit or not completely with two circuits, so that there is no real redundancy.
  • the object of the present invention is to provide a steer-by-wire steering system which is as light as possible and has low energy consumption.
  • the steering circuits are not purely emissive. This means that two steering circuits are always activated simultaneously to adjust the steerable wheels, which results in a relatively high fuel requirement.
  • the steer-by-wire steering system according to the invention has the advantage that the two steering circuits are dimensioned in such a way that they can individually apply the forces required for steering the wheels during normal driving.
  • the parking or maneuvering mode differs from normal driving, in which the steering must exert relatively high forces to steer the wheels due to the higher frictional forces.
  • both steering circuits work together, provided the increased forces are to be applied in the parking or maneuvering mode.
  • the two steering circuits can be mechanically dimensioned smaller. This advantageously results in a lower volume flow requirement of the fluid medium of a steering circuit, as a result of which the pumps can be dimensioned smaller and advantageously a lower fuel requirement is established. Due to the smaller mechanical dimensioning, the steer-by-wire steering system according to the invention is advantageously very compact in structure and low in weight.
  • Both steering circuits advantageously have a valve with a “closed center” (closed enter), as a result of which a low energy consumption of the system can be achieved.
  • a simpler control can be achieved if a control valve with an "open center" is provided for the first steering circuit, which is provided for normal driving. As a result, it is not necessary to provide a pressure accumulator for this steering circuit.
  • the second steering circuit which is only switched on when required or is switched on as a fall-back level when the first steering circuit fails, advantageously uses a control valve which is designed as a valve with a "closed center".
  • the additional use of a pressure accumulator for this second steering circuit means that the pump used to build up pressure does not have to be in continuous operation. This results in further energy savings. Thanks to the pressure accumulator, the second steering circuit is always ready for use and can be activated immediately if required.
  • the volume flow peaks caused by strong steering maneuvers are also affected by the Pressure accumulator covered, which can advantageously be used with a pump with a lower delivery rate.
  • Actuating cylinders are advantageously used as actuating units in a hydraulic system, the actuating cylinders having displacement sensors with which the position of the piston in the actuating cylinder can be adjusted.
  • the force application points of the actuators can either be the tie rod or the steering lever.
  • the respective arrangement of the actuating units is in principle arbitrary and generally depends on the arrangement of other vehicle components. Because of the relatively small and compact design of the steer-by-wire steering system according to the invention, the actuating units can be arranged at different locations in the steering system as described.
  • Fig. 1 A steer-by-wire steering system according to the invention with two actuators, the
  • Fig.3 a parallel arrangement of the two
  • Actuating cylinder with a common point of force Fig. 4: two actuators with a common cylinder housing and piston rod.
  • FIG. 1 shows an inventive two-circuit steer-by-wire system with two actuating cylinders 2, which form the actuating units, the first ends 2a of which are articulated on the tie rod 3.
  • Sensors S monitor the deflection of the two actuating cylinders 2.
  • the tie rod 3 adjusts the steerable wheels 1 via steering levers 4.
  • the second ends 2b of the actuating cylinders 2 are arranged closer to the common vehicle axle A and are fixed there to the bodywork directly or via intermediate parts.
  • the fluid medium is pressed into the working spaces of the actuating cylinder 2 by pressure lines from the pump Pi of the steering circuit LKi via a control valve Vi, which is a valve with an "open center".
  • the steering circuit LK 2 has a valve V 2 , which is a valve with a "closed center". As long as the steering circuit LK 2 or its actuating cylinder 2 is not actively involved in the steering of the wheels 1, the valve V 2 is in the central position, as a result of which the pump P 2 transfers the fluid medium from the storage container 5 via a check valve R into a pressure accumulator D. inflated.
  • the pump P 2 As soon as a certain pressure has been built up in the pressure accumulator D and measured by means of the sensor SP, the pump P 2 is switched off. Through the check valve R, the fluid medium cannot get back from the pressure accumulator D into the storage container 5. By the built-up pressure in the pressure accumulator D of the fluid medium to the steering circuit LK 2 can be activated immediately by adjustment of the valve V2. Due to the pressure in the pressure container D, the pump P 2 does not immediately have to have the required pressure build up, as this is guaranteed by the pressure accumulator D at least for a short time.
  • the actuating cylinders 2 of the two steering circuits LKi and LK 2 can have different points of attack 2a.
  • the actuating cylinder 2 of the steering circuit LKi can act on the tie rod, whereas the actuating cylinder 2 of the steering circuit LK 2 can act on a steering lever 4.
  • the points of attack 2a of the two actuating cylinders 2 of the steering circuits LKi and LK 2 are interchanged in the embodiment described last.
  • the two actuating cylinders or actuating units 12, 22 can have a common force application point. This can be done according to the embodiments. of Figures 3 and 4 can be achieved.
  • the two actuating cylinders 12 are arranged parallel to one another, the two piston rods 13 and 17 being rigidly connected to one another by means of a connecting web 19, so that the pistons 14 and 18 carry out the same movements.
  • the actuating cylinders can have a common cylinder housing 15, a partition 16 then separating the working spaces from one another.
  • the actuating cylinders it is also possible for the actuating cylinders to have separate cylinder housings.
  • both pistons 24 and 25 of the two actuating cylinders 22 are on one common piston rod 23 and arranged in a common cylinder housing 26.
  • the working spaces 27, 28, 29 and 30 are separated from one another by the pistons 24 and 25 or the collar 31 formed or fastened on the cylinder 22 and the seal 32.
  • both the force application point 12a and 22a and alternatively the force application point 12b and 22b can be articulated on the common tie rod or on a steering lever.
  • a tie rod is also required so that the forces of the actuating cylinders 12 and 22 also act on both steered wheels 1.

Landscapes

  • 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

L'invention concerne une direction de type </= steer by wire >/= , comprenant un premier et un deuxième organe de réglage (2) hydraulique agissant sur les roues motrices (1). En état de marche normale, seul le premier organe de réglage (2) agit sur les roues motrices (1), le deuxième organe de réglage (2) n'intervenant qu'accessoirement pour assister le premier organe de réglage (2) et augmenter la force et/ou pour assurer la fonction du premier organe de réglage (2) lorsque celui-ci est en panne.
PCT/EP2002/013604 2001-12-04 2002-12-02 Systeme de direction steer by wire a double circuit comportant deux organes de reglage hydraulique Ceased WO2003047949A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10159297.3 2001-12-04
DE2001159297 DE10159297A1 (de) 2001-12-04 2001-12-04 Zweikreisiges Steer-by-wire-Lenksystem mit zwei hydraulisch betriebenen Stellaggregaten

Publications (1)

Publication Number Publication Date
WO2003047949A1 true WO2003047949A1 (fr) 2003-06-12

Family

ID=7707859

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2002/013604 Ceased WO2003047949A1 (fr) 2001-12-04 2002-12-02 Systeme de direction steer by wire a double circuit comportant deux organes de reglage hydraulique

Country Status (2)

Country Link
DE (1) DE10159297A1 (fr)
WO (1) WO2003047949A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2448914A (en) * 2007-05-03 2008-11-05 Jcb Landpower Ltd Vehicle with two fluid operated steering actuators
WO2020001736A1 (fr) 2018-06-25 2020-01-02 Volvo Truck Corporation Ensemble de direction pour un véhicule

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006019804B4 (de) * 2006-04-28 2009-01-15 Sauer-Danfoss Aps Hydraulische Lenkung
DE102007057023A1 (de) 2006-12-18 2008-06-19 Sauer-Danfoss Aps Aktuatorregelungssystem
DE102011009822B4 (de) * 2011-01-31 2012-12-06 Liebherr-Werk Ehingen Gmbh Mobilkran mit aktiver Hinterachslenkung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2579548A1 (fr) * 1985-03-26 1986-10-03 Renault Systeme de direction assistee a double circuit
DE19615544C1 (de) * 1996-04-19 1997-10-30 Daimler Benz Ag Fahrzeuglenkung
DE19703846A1 (de) * 1997-02-01 1998-08-06 Claas Ohg Elektrohydraulisches Lenksystem für Fahrzeuge
DE19839953A1 (de) * 1998-09-02 2000-03-16 Daimler Chrysler Ag Lenksystem für nicht spurgebundene Kraftfahrzeuge
DE19946074A1 (de) * 1999-09-25 2001-04-26 Volkswagen Ag Elektrohydraulische Lenkung eines Fahrzeuges

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3730708A1 (de) * 1987-09-12 1989-03-23 Man Nutzfahrzeuge Gmbh Hilfskraftlenksystem fuer fahrzeuge
JPH06500290A (ja) * 1990-09-21 1994-01-13 ツェットエフ、フリードリッヒスハーフェン、アクチエンゲゼルシャフト 特に重量自動車に対するラックピニオン形パワーステアリング装置
DK0551371T3 (da) * 1990-10-13 1995-03-13 Zahnradfabrik Friedrichshafen Hydrostatisk styreindretning med hydraulisk hjælpekraftbistand til motorkøretøjer
DE19546733C1 (de) * 1995-12-14 1997-03-27 Daimler Benz Ag Hydraulische Servolenkung
DE19603270C1 (de) * 1996-01-30 1997-07-10 Daimler Benz Ag Hydraulische Servolenkung für Kraftfahrzeuge
DE19733032C1 (de) * 1997-07-31 1998-09-24 Mercedes Benz Lenkungen Gmbh Hydraulische Servolenkung mit geschlossener Mitte
DE19839951C2 (de) * 1998-09-02 2000-06-21 Daimler Chrysler Ag Lenksystem für nicht spurgebundene Kraftfahrzeuge
DE19855405B4 (de) * 1998-12-01 2005-03-03 Daimlerchrysler Ag Hydraulische Servolenkung für Kraftfahrzeuge
DE19935073A1 (de) * 1999-07-28 2001-02-01 Mercedes Benz Lenkungen Gmbh Steer-by-wire-Lenkung mit hydraulischem Druckspeicher

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2579548A1 (fr) * 1985-03-26 1986-10-03 Renault Systeme de direction assistee a double circuit
DE19615544C1 (de) * 1996-04-19 1997-10-30 Daimler Benz Ag Fahrzeuglenkung
DE19703846A1 (de) * 1997-02-01 1998-08-06 Claas Ohg Elektrohydraulisches Lenksystem für Fahrzeuge
DE19839953A1 (de) * 1998-09-02 2000-03-16 Daimler Chrysler Ag Lenksystem für nicht spurgebundene Kraftfahrzeuge
DE19946074A1 (de) * 1999-09-25 2001-04-26 Volkswagen Ag Elektrohydraulische Lenkung eines Fahrzeuges

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2448914A (en) * 2007-05-03 2008-11-05 Jcb Landpower Ltd Vehicle with two fluid operated steering actuators
US7837001B2 (en) 2007-05-03 2010-11-23 Jcb Landpower Limited Dual hydrostatic vehicle steering system
GB2448914B (en) * 2007-05-03 2012-03-07 Jcb Landpower Ltd Vehicle
WO2020001736A1 (fr) 2018-06-25 2020-01-02 Volvo Truck Corporation Ensemble de direction pour un véhicule
US11952060B2 (en) 2018-06-25 2024-04-09 Volvo Truck Corporation Steering assembly for a vehicle

Also Published As

Publication number Publication date
DE10159297A1 (de) 2003-06-12

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