EP1532034A1 - Systeme de direction assistee pour un vehicule - Google Patents

Systeme de direction assistee pour un vehicule

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Withdrawn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)
English (en)
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/fr
Withdrawn legal-status Critical Current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
    • B62D5/06—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.

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

La présente invention concerne un système de direction assistée comprenant une pompe de direction assistée, ainsi qu'un procédé pour faire fonctionner un tel système de direction assistée sur un véhicule comprenant un circuit hydraulique (11) qui présente une soupape à tiroir rotatif (5) et un cylindre de direction (6) associé à ladite soupape, ainsi qu'une soupape de régulation (7) permettant de régler au besoin un flux volumique d'un milieu hydraulique. Cette soupape de régulation (7) est montée côté pression dans ou sur la pompe de direction assistée (1), de façon à diviser le flux volumique (Q) provenant de la pompe de direction assistée (1) au moins en un premier flux partiel de base (A) et en un second flux partiel de régulation (B). Le flux partiel de base (A) ne dépend pas de l'état de fonctionnement de la soupape de régulation (7), alors que le flux partiel de régulation (B) dépend de l'état de fonctionnement de la soupape de régulation (7).
EP03794865A 2002-08-27 2003-08-09 Systeme de direction assistee pour un vehicule Withdrawn EP1532034A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10239143 2002-08-27
DE10239143A DE10239143A1 (de) 2002-08-27 2002-08-27 Lenkhelfvorrichtung für ein Fahrzeug
PCT/EP2003/008870 WO2004024536A1 (fr) 2002-08-27 2003-08-09 Systeme de direction assistee pour un vehicule

Publications (1)

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

Family

ID=31724106

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03794865A Withdrawn EP1532034A1 (fr) 2002-08-27 2003-08-09 Systeme de direction assistee pour un vehicule

Country Status (5)

Country Link
US (1) US7143862B2 (fr)
EP (1) EP1532034A1 (fr)
JP (1) JP2005537184A (fr)
DE (1) DE10239143A1 (fr)
WO (1) WO2004024536A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004026184A1 (de) * 2004-05-28 2005-12-15 Zf Lenksysteme Gmbh Lenksystem
US7302329B2 (en) * 2005-04-14 2007-11-27 Gm Global Technology Operations, Inc. Apparatus, system and method for magnetorheological clutch diagnostics
DE102005052078A1 (de) * 2005-10-28 2007-05-16 Thyssenkrupp Presta Steertec Lenkeinrichtung mit Druckbegrenzungsventil zur Endlagendämpfung und Überlastschutz der Pumpe
DE102007047408A1 (de) 2007-10-04 2008-04-30 Daimler Ag Lenksystem
DE102008019170A1 (de) 2008-04-17 2008-11-27 Daimler Ag Hybrides Fahrzeuglenksystem
DE102008026192A1 (de) 2008-05-30 2008-12-18 Daimler Ag Hydraulische Lenkeinrichtung für ein Kraftfahrzeug
CN103832470A (zh) * 2014-01-24 2014-06-04 大连液压件有限公司 汽车转向泵进油管路流速控制方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4251193A (en) * 1979-09-27 1981-02-17 General Motors Corporation Flow control valve
JPH0825469B2 (ja) * 1987-05-13 1996-03-13 日産自動車株式会社 電子制御パワ−ステアリング装置
US5445239A (en) * 1994-08-01 1995-08-29 General Motors Corporation Motor vehicle power steering system
KR0156433B1 (ko) * 1995-09-19 1998-10-15 석진철 전유압조향시스템의 비상조향장치
US6029766A (en) * 1997-06-17 2000-02-29 Heidt's Hot Rod Shop, Inc. Adjustable power steering proportioning valve
JP3859405B2 (ja) * 1999-10-01 2006-12-20 カヤバ工業株式会社 フェールセーフ回路
EP1108638B1 (fr) 1999-12-13 2003-08-27 Kayaba Industry Co., Ltd. Direction assistée
DE102004044729A1 (de) * 2003-09-18 2005-04-21 Hitachi Unisia Automotive Ltd Hilfskraftlenkungssystem

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004024536A1 *

Also Published As

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

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