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WO2009037169A1 - Dispositif de réglage électrohydraulique - Google Patents

Dispositif de réglage électrohydraulique Download PDF

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Publication number
WO2009037169A1
WO2009037169A1 PCT/EP2008/062014 EP2008062014W WO2009037169A1 WO 2009037169 A1 WO2009037169 A1 WO 2009037169A1 EP 2008062014 W EP2008062014 W EP 2008062014W WO 2009037169 A1 WO2009037169 A1 WO 2009037169A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
pressure chamber
piston
electric motor
actuator
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/EP2008/062014
Other languages
German (de)
English (en)
Inventor
Otto Ebner
Christoph RÜCHARDT
Reiner Keller
Martin Rossmann
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.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen 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 ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of WO2009037169A1 publication Critical patent/WO2009037169A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
    • F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
    • F15B9/03—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type with electrical control means

Definitions

  • the invention generally relates to an electro-hydraulic actuator, with a drivable by means of a controllable electric motor actuator and with a double-acting actuator cylinder arranged therein with a axially movable and two pressure chambers separating actuator trained Stellkraft successive, wherein the actuating piston is connected to a mutually movable in opposite directions actuator, and in which by an alternating pressure supply of a pressure chamber and a pressure relief of the other pressure chamber, an actuating force of the actuating element takes place in a respective opposite direction.
  • the invention relates in particular to an electrohydraulic adjusting device of a power steering system of a motor vehicle, with a controllable by a controllable electric motor actuator and with a double-acting actuator cylinder with a axially movable and two pressure chambers separating actuating piston trained Stellkraft successive, wherein the actuating piston with a movable in opposite directions steering element Vehicle steering is connected, and in which takes place by an alternating pressure supply of a pressure chamber and a pressure relief of the other pressure chamber acting on the vehicle steering servo control force of the actuating element in a respective opposite direction.
  • Electrohydraulic actuators with alternately opposite direction of actuation are preferably used in motor vehicles, for example for the power assistance of a front axle steering, for operating a rear axle steering and / or for opening and closing a convertible top; however, they may also be used in other technical equipment and installations.
  • vehicle steering electro-hydraulic actuators are special suitable, since they generally have good control properties in addition to compact dimensions and a high energy density, so allow well-controlled actuating forces to support a manually made by a driver steering rashes and steering forces.
  • the actuator of an electro-hydraulic actuator is usually designed as a hydraulic pump, which sucks in a drive by the electric motor, a pressure medium (hydraulic oil) from a first line and promotes a rising with the speed of the electric motor pressure in a second line.
  • a pressure medium hydroaulic oil
  • the assignment of the two lines to the two pressure chambers of the actuating cylinder via a control valve can be done variably, or take place at a fixed assignment of the two lines via a reversal of the direction of rotation of the electric motor.
  • the steering valve is operatively connected to a steering column in such a way that the pressure line and the return line according to the steering angle of a steering wheel attached to the steering column alternately with the two pressure chambers of the actuator formed as double-acting actuator is connectable, the actuator piston via a piston rod with a steering gear rod of the vehicle steering in Stellharm stands.
  • the actuator piston via a piston rod with a steering gear rod of the vehicle steering in Stellharm stands.
  • a further electrohydraulic adjusting device of a power steering system of a motor vehicle in which a trained as a hydraulic pump actuating force is driven by a rotating alternately in two opposite directions of rotation electric motor.
  • Two hydraulic lines one of which, depending on the direction of rotation of the electric motor, forms a pressure line and the other forms the return line, are in each case connected to a pressure chamber of the actuating force actuator designed as a double-acting actuating cylinder.
  • the direction of rotation of the electric motor is switched according to the detected via a rotational angle sensor steering angle of a steering wheel.
  • actuating cylinder acts as a steering damper when the power steering is deactivated, that is, when the hydraulic pump is not driven.
  • a disadvantage of this known actuator is the high expenditure on equipment, which is given in particular by the relatively complicated bypass valve and the check valves, and the delayed response to the actuating force, which is caused by the start-up of the hydraulic pump due to design.
  • the present invention is therefore based on the object to propose a generally usable, but preferably for a power steering of a motor vehicle electrohydraulic actuator which avoids the aforementioned disadvantages, so with a simple and inexpensive construction better control properties, in particular an improved response has.
  • the invention is therefore initially based on an electro-hydraulic actuator, with a drivable by a controllable electric motor actuator and with a double-acting actuator cylinder arranged therein axially movable and two pressure chambers separating actuator piston, wherein the actuating piston with an alternately movable in opposite directions actuator is connected, and in which by an alternating pressure supply of a pressure chamber and a pressure relief of the other pressure chamber, an actuating force of the actuating element takes place in a respective opposite direction.
  • the actuating force sensor is designed as a double-acting pressure cylinder, in which a connected via a spindle gear to the electric motor piston is guided axially movable and axially bounded on both sides each have a pressure chamber, each having a hydraulic line with a different pressure chamber of the Stellkraft ceremoniess communicate.
  • An independent technical solution is also according to claim 2 of an electro-hydraulic actuator, with a means of a controllable electric motor drivable actuator and with a double-acting actuator cylinder arranged therein with a axially movable and two pressure chambers separating actuator trained Stellkraft successive, wherein the actuating piston is connected to a mutually movable in opposite directions actuator, and in which by an alternating pressure supply of a pressure chamber and a Pressure relief of the other pressure chamber is an actuating force of the actuating element in a respective opposite direction.
  • the actuator has two single-acting pressure cylinder, which are arranged axially symmetrically on both sides of the electric motor whose pistons are connected via a provided with a common spindle shaft spindle gear with the electric motor, and their pressure chambers each have a hydraulic line with another pressure chamber of the actuator keep in touch.
  • an electro-hydraulic actuator in a power steering system of a motor vehicle solution is defined by the features of independent claim 3.
  • the invention in this case is based on an electro-hydraulic actuator of a power steering system of a motor vehicle, with a controllable by a controllable electric motor actuator and with a double-acting actuator cylinder arranged therein axially beweglich arranged and two pressure chambers actuating piston trained Stellkraft successive, wherein the actuating piston with a in opposite directions movable steering element of a vehicle steering is connected and takes place by an alternating pressure supply of a pressure chamber and a pressure relief of the other pressure chamber acting on the vehicle steering servo control force of the steering element in a respective opposite direction.
  • the actuating force sensor is designed as a double-acting pressure cylinder, in which a connected via a spindle gear to the electric motor piston is axially movable and axially on both sides each have a pressure chamber. borders, which are each connected via a hydraulic line with a different pressure chamber of the Stellkraft ceremoniess.
  • the invention is based on an electro-hydraulic adjusting device of a power steering system of a motor vehicle, with a controllable by a controllable electric motor actuator and with a double-acting actuator cylinder arranged therein axially beweglich and two pressure chambers separating actuator trained Stellkraft successive, wherein the actuating piston with a movable in opposite directions Steering element of a vehicle steering is connected and effected by an alternating pressure supply of a pressure chamber and a pressure relief of the other pressure chamber acting on the vehicle steering servo control force of the steering element in a respective opposite direction.
  • the actuating force sensor comprises two single-acting pressure cylinders, which are arranged mirror-symmetrically on both sides of the electric motor whose pistons are connected via a provided with a common spindle shaft spindle gear to the electric motor, and their pressure chambers each have a hydraulic line to another pressure chamber of the adjusting force keep in touch.
  • the invention is based on an electrohydraulic adjusting device, for example an electrohydraulic adjusting device of a power steering system of a motor vehicle, which has an actuating force transducer which can be driven by means of a controllable electric motor and a force actuator which is designed as a double-acting actuating cylinder with an actuating piston which is axially movable and separates two pressure chambers , wherein the actuating piston with an alternately movable in opposite directions actuator, such as a Steering element of a vehicle steering, is connected, and in which by an alternating pressure supply of a pressure chamber and a pressure relief of the other pressure chamber, an actuating force of the actuating element, for example, an effective on the vehicle steering servo control force of the actuating element takes place in a respective opposite direction.
  • an electrohydraulic adjusting device for example an electrohydraulic adjusting device of a power steering system of a motor vehicle, which has an actuating force transducer which can be driven by means
  • the inventive design of the actuating force transducer as a double-acting pressure cylinder whose piston is driven by a spindle gear from the electric motor, or as two single-acting pressure cylinder whose pistons are driven with opposite effective direction via a provided with a common spindle shaft spindle gear from the electric motor, resulting in Connection with a relatively simple structure of the actuator good control properties for setting a desired actuation or Servo staff.
  • the piston of the pressure cylinder or the piston of a pressure cylinder is loaded via the spindle gear with an axial force in the direction of a pressure chamber, whereby the pressure in this pressure chamber increases and pressure medium via the associated hydraulic line in the a pressure chamber of the Stellkraft ceremoniess flows.
  • the adjusting device when used as a power steering system of a motor vehicle, permits particularly sensitive servo assistance of the vehicle steering system as a function of a plurality of operating parameters, such as the steering angle, the steering torque and / or the driving speed.
  • the actuating force sensor is designed as a double-acting pressure cylinder.
  • an electromagnetic adjustment of the piston is provided in the actuating force generator.
  • the piston consists at least partially of magnetic or magnetizable material and is axially displaceable in the pressure cylinder by axially oppositely disposed electromagnets against the restoring force of two centering springs. Since the magnetically transferable control forces are strongly path-dependent, the pressure cylinder is axially relatively short and has a comparatively large diameter.
  • a bypass valve is expediently arranged between the two hydraulic lines, which is open in the unactuated idle state.
  • the power steering of the vehicle steering system about the center position of the steering wheel and are completely turned off at high speeds without the vehicle steering is obstructed by the located in the two pressure chambers of the Stellkraft mecanics pressure medium.
  • the bypass valve is preferably designed as a 2/2-way solenoid valve, the control piston releases a connection of the two hydraulic lines in the de-energized rest position and locks the connection of the two hydraulic lines in the energized operating position.
  • a magnetic switching valve is particularly cost-effective and easy to control with high reliability.
  • the spindle gear is preferably designed as a recirculating ball screw drive.
  • Such a spindle gear is particularly free of play and low in resistance, so that this results in a particularly accurate and low-hysteresis relationship between the torque of the electric motor and effective on the actuating piston of the adjusting force pressure difference.
  • the electric motor used to drive the piston of the positioning force generator is preferably designed as an electronically commutating brushless DC motor, since this type of electric motor is particularly precisely controlled and has a long service life due to a largely wear-free operation.
  • the components of the adjusting device ie the electric motor, the actuating force, the adjusting force, the hydraulic lines and the bypass valve, advantageously in a common, pre-assembled control module summarized.
  • FIG. 1 shows a power steering of a motor vehicle with a first embodiment of the electro-hydraulic adjusting device according to the invention in a schematic representation
  • Fig. 2 is a power steering of a motor vehicle with a second embodiment of the electro-hydraulic actuator according to the invention also in a schematic representation.
  • a power steering 1.1 of a motor vehicle has an electrohydraulic actuating device 2.1, which essentially consists of a controllable electric motor 3 drivable Stellkraftgeber 4.1 and a double-acting actuator cylinder 6 with an axially movable therein and two pressure chambers 7, 8 separating actuator piston 9 trained Stellkraft- 5 consists.
  • the actuating piston 9 is axially on both sides via a respective steering rod 10, 1 1 and one steering arm 12, 13 articulated with steerable wheels 14, 15 of a front axle.
  • a driver-operable steering wheel 16 is connected via a steering column 17 and a steering gear 18 with one of the handlebars 10, 1 1 in such a position that rotation of the steering wheel 16 leads to a steering angle of the wheels 14, 15 in the desired direction.
  • the positioning force generator 4.1 is designed as a double-acting pressure cylinder 19 in which a connected via a spindle gear 20 with the electric motor 3 piston 21 is guided axially movable. This piston 21 axially delimits on both sides in each case a pressure chamber 22 or 23, which are in each case connected via a hydraulic line 24 or 25 to a respective different pressure chamber 7, 8 of the actuating force 5.
  • the piston 21 of the pressure cylinder 19 is loaded via the spindle gear 20 with an axial force in the direction of a pressure chamber 22, whereby the pressure in this pressure chamber 22 increases and pressure fluid via the associated hydraulic line 24 in the a pressure chamber 7 of the actuator 5 flows.
  • the piston 21 of the pressure cylinder 19 moves away from the other pressure chamber 23, whereby the pressure in this pressure chamber 23 drops and pressure medium via the other hydraulic line 25 from the other pressure chamber 8 of the actuator 5 is sucked.
  • a Servo vowel force 26 is generated, which is effective on the two steering levers 12, 13 via the two handlebars 10, 1.
  • a rotation angle sensor To generate a suitable power assistance of the vehicle steering, in which the servo control force 26, 27 acts according to the steering direction of the steering wheel 16 and increases with increasing steering angle of the steering wheel 16 and the steering force applied by the driver and decreases with increasing travel speed of the motor vehicle, are a rotation angle sensor
  • the electric motor 3 is preferably designed as an electronically commutating brushless DC motor and the spindle gear 20 is advantageously designed as a recirculating ball screw drive.
  • an electrically actuated bypass valve 34 is arranged, which is controlled via an electrical control line 35 of the control unit 32 and opened in the unactuated idle state. This is to avoid blocking the vehicle steering, e.g. when not needed power assistance or when a fault occurs, advantageously no electrical energy needed.
  • the bypass valve 34 is presently designed as a 2/2-way solenoid valve, the control piston in the de-energized rest position releases a connection of the two hydraulic lines 24 and 25 and in the energized operating position, the connection between these two hydraulic lines 24, 25 blocks.
  • a power steering system 1.2 of a motor vehicle likewise has an electrohydraulic adjusting device 2.2, which essentially consists of a controllable electric motor 3 drivable Stellkraftgeber 4.2 and a double acting Stellzylinder 6 with an axially movable therein and two pressure chambers 7, 8 separating actuator piston 9 trained actuator 5 consists.
  • the actuating force generator essentially consists of a controllable electric motor 3 drivable Stellkraftgeber 4.2 and a double acting Stellzylinder 6 with an axially movable therein and two pressure chambers 7, 8 separating actuator piston 9 trained actuator 5 consists.
  • the piston 38 of a pressure cylinder 36 is loaded via the spindle gear 40 with an axial force in the direction of its pressure chamber 41, whereby the pressure in this pressure chamber 41 increases and pressure medium via the associated hydraulic line 24 in the a pressure chamber 7 of the Stellkraft choirs 5 flows.
  • the piston 39 of the other pressure cylinder 37 moves away from its pressure chamber 42, as a result of which the pressure in this pressure chamber 42 drops and pressure fluid is drawn in via the other hydraulic line 25 from the other pressure chamber 8 of the actuating force 5.
  • the pressure difference acting on the adjusting piston 9 of the adjusting force actuator 5 acts in a known manner as a servo adjusting force 26 on the two steering levers 12, 13 and is reversible in its operating direction by an opposite direction of rotation of the electric motor 3 (servo adjusting force 27).
  • the mode of action of this adjusting device 2.2 thus corresponds in principle to that of the adjusting device according to FIG. 1.

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

Abstract

L'invention concerne un dispositif de réglage électrohydraulique comportant un transmetteur de force de réglage (4.1) pouvant être entraîné au moyen d'un moteur électrique commandable (3), et un récepteur de force de réglage (5) conçu en tant que cylindre de réglage (6) à effet double, contenant un piston de réglage (9) disposé axialement mobile dans le cylindre de réglage, séparant deux chambres de pression (7, 8). Le piston de réglage (9) est connecté à un élément de réglage (12, 13) pouvant être déplacé alternativement dans des sens opposés. Une application de pression alternative sur une chambre de pression (7, 8), et une décompression sur l'autre chambre de pression (8, 7) donnent lieu à une force d'actionnement (26, 27) de l'élément de réglage (12, 13) dans un sens respectivement opposé. pour obtenir de meilleures propriétés de commande, le transmetteur de force de réglage (4.1) est conçu en tant que cylindre de pression (19) à effet double, dans lequel un piston (21) connecté au moteur électrique (3) au moyen d'un entraînement à broche (20) est guidé axialement mobile et délimite respectivement, de façon axialement bilatérale, une chambre de pression (22, 23) respectivement connectée à une autre chambre de pression (7, 8) du récepteur de force de réglage (5) au moyen d'une conduite hydraulique respective (24, 25).
PCT/EP2008/062014 2007-09-18 2008-09-11 Dispositif de réglage électrohydraulique Ceased WO2009037169A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007044430.5 2007-09-18
DE102007044430A DE102007044430A1 (de) 2007-09-18 2007-09-18 Elektrohydraulische Stellvorrichtung

Publications (1)

Publication Number Publication Date
WO2009037169A1 true WO2009037169A1 (fr) 2009-03-26

Family

ID=40130127

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/062014 Ceased WO2009037169A1 (fr) 2007-09-18 2008-09-11 Dispositif de réglage électrohydraulique

Country Status (2)

Country Link
DE (1) DE102007044430A1 (fr)
WO (1) WO2009037169A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59118569A (ja) * 1982-12-22 1984-07-09 Toyoda Mach Works Ltd 車両用動力舵取装置
US20020170769A1 (en) * 2001-05-17 2002-11-21 Unisia Jecs Corporation Power steering device
WO2005110834A1 (fr) * 2004-05-03 2005-11-24 Zf Lenksysteme Gmbh Direction assistee hydraulique

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57198169A (en) 1981-05-29 1982-12-04 Tokai T R W Kk Motor-driven oil pressure power steering unit
DE3603065A1 (de) 1985-02-07 1986-08-14 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen Servolenkung fuer fahrzeuge
US4653815A (en) * 1985-10-21 1987-03-31 General Motors Corporation Actuating mechanism in a vehicle wheel brake and anti-lock brake control system
DE3721693A1 (de) * 1987-07-01 1989-01-19 Eumuco Ag Fuer Maschinenbau Elektrohydraulisches stellglied
CH677913A5 (fr) * 1988-09-30 1991-07-15 Bucher Maschf Gmbh
US5234263A (en) * 1992-03-09 1993-08-10 General Motors Corporation Electric master cylinder traction control
DE4426682A1 (de) * 1994-07-28 1996-02-01 Teves Gmbh Alfred Elektronisch regelbares Bremsbetätigungssystem
DE19513347B4 (de) * 1995-04-08 2006-01-19 Continental Teves Ag & Co. Ohg Elektromechanisch betätigbarer Druckmodulator
DE19546733C1 (de) * 1995-12-14 1997-03-27 Daimler Benz Ag Hydraulische Servolenkung
DE19708142A1 (de) * 1997-02-28 1998-09-03 Itt Mfg Enterprises Inc Hydraulische Bremsanlage, insbesondere für Kraftfahrzeuge
FR2822429B1 (fr) * 2001-03-26 2003-05-16 Renault Direction assistee munie d'un dispositif de compensation du tirage et procede
DE10317413A1 (de) * 2002-04-15 2003-12-11 Tox Pressotechnik Gmbh Hydraulischer Druckübersetzer
DE102005054798A1 (de) * 2005-11-15 2007-05-16 Zahnradfabrik Friedrichshafen Verstellbarer Stabilisator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59118569A (ja) * 1982-12-22 1984-07-09 Toyoda Mach Works Ltd 車両用動力舵取装置
US20020170769A1 (en) * 2001-05-17 2002-11-21 Unisia Jecs Corporation Power steering device
WO2005110834A1 (fr) * 2004-05-03 2005-11-24 Zf Lenksysteme Gmbh Direction assistee hydraulique

Also Published As

Publication number Publication date
DE102007044430A1 (de) 2009-03-19

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