JP4674882B2 - 車両懸架システム用の受動的ライド制御 - Google Patents

車両懸架システム用の受動的ライド制御 Download PDF

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Publication number
JP4674882B2
JP4674882B2 JP2000610695A JP2000610695A JP4674882B2 JP 4674882 B2 JP4674882 B2 JP 4674882B2 JP 2000610695 A JP2000610695 A JP 2000610695A JP 2000610695 A JP2000610695 A JP 2000610695A JP 4674882 B2 JP4674882 B2 JP 4674882B2
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Japan
Prior art keywords
fluid
roll
wheel
vehicle
damping
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Expired - Lifetime
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JP2000610695A
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English (en)
Japanese (ja)
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JP2002541015A5 (enExample
JP2002541015A (ja
Inventor
ヘイリング,クリストファー,ブライアン
ロングマン,マイケル,ジェームス
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キネティック プロプライエタリー リミテッド
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Priority claimed from AUPP9709A external-priority patent/AUPP970999A0/en
Priority claimed from AUPP9983A external-priority patent/AUPP998399A0/en
Application filed by キネティック プロプライエタリー リミテッド filed Critical キネティック プロプライエタリー リミテッド
Publication of JP2002541015A publication Critical patent/JP2002541015A/ja
Publication of JP2002541015A5 publication Critical patent/JP2002541015A5/ja
Application granted granted Critical
Publication of JP4674882B2 publication Critical patent/JP4674882B2/ja
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Expired - Lifetime legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60GVEHICLE SUSPENSION ARRANGEMENTS
    • B60G21/00Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
    • B60G21/10Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces not permanently interconnected, e.g. operative only on acceleration, only on deceleration or only at off-straight position of steering
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60GVEHICLE SUSPENSION ARRANGEMENTS
    • B60G21/00Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
    • B60G21/02Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected
    • B60G21/06Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected fluid

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Body Suspensions (AREA)
  • Fluid-Damping Devices (AREA)
JP2000610695A 1999-04-12 2000-04-12 車両懸架システム用の受動的ライド制御 Expired - Lifetime JP4674882B2 (ja)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
AUPP9709A AUPP970999A0 (en) 1999-04-12 1999-04-12 Ride control arrangement for a vehicle suspension system
AUPP9983A AUPP998399A0 (en) 1999-04-23 1999-04-23 Ride control arrangement for a vehicle suspension system
AU9709 1999-04-23
AU9983 1999-04-23
PCT/AU2000/000312 WO2000061394A1 (en) 1999-04-12 2000-04-12 Passive ride control for a vehicle suspension system

Publications (3)

Publication Number Publication Date
JP2002541015A JP2002541015A (ja) 2002-12-03
JP2002541015A5 JP2002541015A5 (enExample) 2008-05-01
JP4674882B2 true JP4674882B2 (ja) 2011-04-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000610695A Expired - Lifetime JP4674882B2 (ja) 1999-04-12 2000-04-12 車両懸架システム用の受動的ライド制御

Country Status (6)

Country Link
US (2) US6761371B1 (enExample)
EP (1) EP1189775B1 (enExample)
JP (1) JP4674882B2 (enExample)
DE (1) DE60034230T2 (enExample)
ES (1) ES2282098T3 (enExample)
WO (1) WO2000061394A1 (enExample)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11267310B2 (en) 2018-05-29 2022-03-08 Hitachi Astemo, Ltd. Suspension apparatus
US20230364958A1 (en) * 2022-05-13 2023-11-16 Ford Global Technologies, Llc Suspension system with dynamic weight balancing control
US12220963B2 (en) 2023-04-18 2025-02-11 DRiV Automotive Inc. Modular load distribution unit and assembly method
US12269311B2 (en) * 2023-04-18 2025-04-08 DRiV Automotive Inc. Dual tube load distribution unit for vehicle suspension system

Families Citing this family (62)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070035105A1 (en) * 1992-08-17 2007-02-15 Yale Donald M Suspension stabilizer system with pressure controller device
AUPR249901A0 (en) 2001-01-10 2001-02-01 Kinetic Pty Limited Vehicle suspension roll control system
ES2223205B1 (es) * 2001-09-07 2007-01-01 Creuat S.L. Sistema de suspension para un vehiculo a motor y dispositivos para su realizacion.
AUPR801301A0 (en) * 2001-09-28 2001-10-25 Kinetic Pty Limited Vehicle suspension system
SE525383C2 (sv) 2002-09-02 2005-02-08 Hultdin System Ab Stötdämpande hydraulsystem för terränggående lastfordon samt terränggående lastfordon innefattande ett sådant hydraulsystem
AU2002953153A0 (en) * 2002-12-06 2002-12-19 Kinetic Pty Limited Hydraulic suspension system
DE10260788A1 (de) * 2002-12-23 2004-07-01 Daimlerchrysler Ag Einstellbares Feder-Dämpfer-System in einem Fahrzeug
AU2003900894A0 (en) * 2003-02-27 2003-03-13 Kinetic Pty Limited Hydraulic system for a vehicle suspension
EP1602512B1 (en) * 2003-03-12 2016-04-27 Toyota Jidosha Kabushiki Kaisha Suspension system for motor vehicle
JP4155066B2 (ja) 2003-03-12 2008-09-24 トヨタ自動車株式会社 車両懸架装置
US7273117B2 (en) * 2003-05-15 2007-09-25 General Dynamics Land Systems, Inc. Vehicle suspension apparatus
US7628414B2 (en) * 2004-08-06 2009-12-08 Illinois Tool Works Inc. Vehicle roll stabilizing damper system
US7665585B2 (en) 2004-09-03 2010-02-23 Alexandridis Alexander A Vehicle suspension system and method for operating
EP1853442B1 (en) * 2005-03-01 2018-11-14 Kinetic Pty Ltd. Hydraulic system for a vehicle suspension
CN101189139B (zh) 2005-03-01 2010-05-19 凯耐提克控股有限公司 用于车辆悬架系统的液压系统
US7751959B2 (en) 2005-06-21 2010-07-06 Tenneco Automotive Operating Company Inc. Semi-active suspension system with anti-roll for a vehicle
WO2007098559A1 (en) * 2006-03-02 2007-09-07 Kinetic Pty Ltd Hydraulic system for a vehicle suspension
DE102006012173A1 (de) * 2006-03-16 2007-09-20 Trw Automotive Gmbh Fahrwerksystem
CN101765727B (zh) * 2007-05-21 2012-01-18 悉尼科技大学 互连悬架系统
US8006988B1 (en) * 2008-02-06 2011-08-30 Turner Roy A Self-leveling air spring suspension system
WO2009111826A1 (en) * 2008-03-10 2009-09-17 Kinetic Pty Ltd Vehicle suspension arrangements & control
US20100109277A1 (en) * 2008-11-06 2010-05-06 Furrer Fredrick J Adjustable Monotube Shock Absorber
US8196723B1 (en) 2008-11-14 2012-06-12 Robust Systems Solutions, LLC Pneumatic damper
US8480106B1 (en) 2009-07-23 2013-07-09 The George Washington University Dual suspension system
GB2474030A (en) * 2009-10-01 2011-04-06 Trysome Ltd A damper unit for a vehicle suspension system and a vehicle including such a damper unit
US8585062B2 (en) * 2009-11-09 2013-11-19 Nucleus Scientific, Inc. Tunable pneumatic suspension
EP2353895A1 (de) * 2010-02-01 2011-08-10 Stadler Bussnang AG Fahrwerk für ein Fahrzeug
US8465025B2 (en) 2010-08-31 2013-06-18 Oshkosh Corporation Gas spring assembly for a vehicle suspension
US8789834B1 (en) 2011-08-29 2014-07-29 Roy A. Turner Self-leveling airbag suspension system
US8966889B2 (en) 2011-11-01 2015-03-03 Tenneco Automotive Operating Company Inc. Energy harvesting passive and active suspension
WO2013069469A1 (ja) * 2011-11-09 2013-05-16 アイシン精機株式会社 車両のサスペンション装置
US9481221B2 (en) 2013-01-08 2016-11-01 Tenneco Automotive Operating Company Inc. Passive and active suspension with optimization of energy usage
DE102014019822B3 (de) * 2013-02-14 2017-09-28 Ford Global Technologies, Llc Radaufhängung mit Stabilisatoranordnung
KR101548604B1 (ko) * 2014-11-10 2015-09-01 주식회사 타스글로벌 자석휠의 하중 분산 장치
US10434835B2 (en) 2016-02-24 2019-10-08 Tenneco Automotive Operating Company Inc. Monotube active suspension system having different system layouts for controlling pump flow distribution
MX394967B (es) 2016-09-13 2025-03-24 Nucleus Scient Inc Sistema de accionamiento electrico de enlace de multiples varillas
US10358010B2 (en) 2017-06-05 2019-07-23 Tenneco Automotive Operating Company Inc. Interlinked active suspension
CN107297997B (zh) * 2017-08-10 2024-01-26 常州万安汽车部件科技有限公司 车辆悬架系统和机动车
GB2597455B (en) * 2020-07-21 2023-04-26 Jaguar Land Rover Ltd Active suspension system
GB2597454B (en) * 2020-07-21 2023-01-25 Jaguar Land Rover Ltd Active suspension system
US11623493B2 (en) * 2020-11-04 2023-04-11 Terex South Dakota, Inc. Vehicle suspension system
US11623492B2 (en) * 2020-11-04 2023-04-11 Terex South Dakota, Inc. Vehicle suspension system
CN113003501B (zh) * 2021-03-19 2022-06-24 湖南星邦智能装备股份有限公司 高空作业平台的浮动装置
US11697319B2 (en) * 2021-10-12 2023-07-11 DRiV Automotive Inc. Suspension system with comfort valve integration
US11865889B2 (en) 2021-10-12 2024-01-09 DRiV Automotive Inc. Suspension system with comfort valves between cross-over hydraulic circuits
US11691474B2 (en) 2021-10-12 2023-07-04 DRiV Automotive Inc. Suspension system tank filling systems and methods
US12097739B2 (en) 2021-10-12 2024-09-24 DRiV Automotive Inc. Pump rinsing systems and methods
US11938772B2 (en) 2021-10-12 2024-03-26 DRiV Automotive Inc. System for grading filling of a hydraulic suspension system
US11865887B2 (en) 2021-10-12 2024-01-09 DRiV Automotive Inc. Suspension system with incremental roll and pitch stiffness control
US11904841B2 (en) 2021-10-12 2024-02-20 DRiV Automotive Inc. Suspension system integration with advanced driver assistance system
US11912092B2 (en) 2021-10-12 2024-02-27 DRiV Automotive Inc. Suspension leak check systems and methods
US12059937B2 (en) 2021-10-12 2024-08-13 DRiV Automotive Inc. Suspension system with roll and pitch stiffness deactivation based on road profile information
US11919355B2 (en) 2021-10-12 2024-03-05 DRiV Automotive Inc. Valve diagnostic systems and methods
US12168378B2 (en) 2021-10-12 2024-12-17 DRiV Automotive Inc. Accumulator check systems and methods
US11685220B2 (en) 2021-10-12 2023-06-27 DRiV Automotive Inc. Control systems and methods for suspension systems
US11738620B2 (en) * 2022-01-13 2023-08-29 Hoerbiger Automotive Komforsysteme Gmbh Motor vehicle chassis
US12115824B2 (en) 2022-03-28 2024-10-15 Rivian Ip Holdings, Llc Configurable interconnected suspension system
US12049114B2 (en) 2022-10-06 2024-07-30 Rivian Ip Holdings, Llc Configurable interconnected suspension system
US12344065B2 (en) 2023-05-15 2025-07-01 Advanced Suspension Technology Llc Single axle roll control system with multiple pressurizing devices arranged in series
US12083848B1 (en) 2023-05-15 2024-09-10 DRiV Automotive Inc. Single axle roll control system with dual impeller pump arrangement
US12083851B1 (en) 2023-05-15 2024-09-10 DRiV Automotive Inc. Single axle roll control system with multiple circuit-specific pressurizing devices
US12251978B2 (en) 2023-05-15 2025-03-18 DRiV Automotive Inc. Single axle roll control system that includes a dual chamber ball-screw mechanism

Family Cites Families (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US460655A (en) 1891-10-06 patton
JPS4716188Y1 (enExample) * 1967-06-29 1972-06-07
GB1488254A (en) 1974-12-23 1977-10-12 Automotive Prod Co Ltd Vehicle suspensions
JPS5475719A (en) * 1977-11-25 1979-06-16 Nissan Motor Co Ltd Hidro-pneumatic suspension
FR2581596B1 (fr) 1985-05-09 1989-12-08 Peugeot Anti-roulis hydro-pneumatique
FR2600950B1 (fr) * 1986-07-02 1988-10-21 Peugeot Suspension hydropneumatique pour vehicule automobile
JP2503241B2 (ja) * 1987-11-30 1996-06-05 日産自動車株式会社 能動型サスペンション
JP3038832B2 (ja) * 1990-07-31 2000-05-08 日産自動車株式会社 車両用減衰力制御装置
JPH04126621A (ja) * 1990-09-18 1992-04-27 Mitsubishi Motors Corp 車両用アクティブサスペンション装置
GB2255056B (en) * 1991-04-23 1994-12-14 Lotus Car A vehicle suspension system
ATE180218T1 (de) 1991-07-02 1999-06-15 Kinetic Ltd Fahrzeugaufhängungssystem
AU670034B2 (en) 1991-07-16 1996-07-04 Kinetic Limited Vehicle suspension system
US5447332A (en) * 1991-07-16 1995-09-05 Kinetic Limited Vehicle suspension system
JPH0532111A (ja) * 1991-07-30 1993-02-09 Nissan Motor Co Ltd 車両の揺動減衰装置
US5562305A (en) * 1991-12-18 1996-10-08 Kinetic Limited Vehicle suspension system
JP2946900B2 (ja) * 1991-12-27 1999-09-06 日産自動車株式会社 輪荷重移動制御装置
SE505594C2 (sv) 1992-10-15 1997-09-22 Oehlins Racing Ab Anordning vid stötdämpararrangemang
JPH06183240A (ja) * 1992-12-17 1994-07-05 Nissan Motor Co Ltd 車両の揺動減衰装置
JPH079831A (ja) * 1993-06-29 1995-01-13 Kobe Steel Ltd ハイドロニューマチックサスペンション
US5915701A (en) * 1993-12-30 1999-06-29 Kinetic Limited Vehicle suspension system
WO1995023076A1 (en) * 1994-02-25 1995-08-31 Kinetic Limited Hydraulic suspension with independent pitch and roll control
JP3806755B2 (ja) * 1994-02-25 2006-08-09 キネティック リミテッド ピッチおよびロール・コントロールつきハイドロリック・サスペンション
US5486018A (en) 1994-08-05 1996-01-23 Yamaha Hatsudoki Kabushiki Kaisha Suspension system for four-wheeled vehicles
TW355699B (en) 1995-08-21 1999-04-11 Kiectic Ltd Vehicular suspension systems
US5794966A (en) * 1996-02-05 1998-08-18 Macleod; Kenneth J. Vehicular suspension system
US6270098B1 (en) * 1996-10-31 2001-08-07 Kinetic Limited Load distribution unit for vehicle suspension system
WO1998018641A1 (en) * 1996-10-31 1998-05-07 Kinetic Limited Load distribution unit for vehicle suspension system
JP4036393B2 (ja) * 1996-12-24 2008-01-23 キネティック リミテッド ロール制御機構を有する受動的車両用サスペンション装置
WO1998036923A1 (en) * 1997-02-18 1998-08-27 Kinetic Limited Control arrangement for vehicle suspension system
EP0858918A1 (en) * 1997-02-18 1998-08-19 MUMFORD, Michael Anthony Anti-roll suspension systems for vehicles
EP0893321A1 (fr) * 1997-07-24 1999-01-27 Gec Alsthom Transport Sa Dispositif de suspension oléopneumatique anti-roulis ou anti-lacet
US6220613B1 (en) * 1997-07-25 2001-04-24 Actuant Corporation Hydro-pneumatic vehicle suspension system
AU757591B2 (en) * 1999-04-12 2003-02-27 Kinetic Pty Limited Active ride control for a vehicle suspension system
JP4319309B2 (ja) * 1999-11-11 2009-08-26 ヤマハ発動機株式会社 車両用懸架装置
JP2001191778A (ja) * 2000-01-11 2001-07-17 Yamaha Motor Co Ltd 四輪車用懸架装置

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11267310B2 (en) 2018-05-29 2022-03-08 Hitachi Astemo, Ltd. Suspension apparatus
US20230364958A1 (en) * 2022-05-13 2023-11-16 Ford Global Technologies, Llc Suspension system with dynamic weight balancing control
US12097735B2 (en) * 2022-05-13 2024-09-24 Ford Global Technologies, Llc Suspension system with dynamic weight balancing control
US12220963B2 (en) 2023-04-18 2025-02-11 DRiV Automotive Inc. Modular load distribution unit and assembly method
US12269311B2 (en) * 2023-04-18 2025-04-08 DRiV Automotive Inc. Dual tube load distribution unit for vehicle suspension system

Also Published As

Publication number Publication date
DE60034230T2 (de) 2007-12-20
EP1189775B1 (en) 2007-04-04
DE60034230D1 (de) 2007-05-16
US20050001401A1 (en) 2005-01-06
WO2000061394A1 (en) 2000-10-19
US6761371B1 (en) 2004-07-13
EP1189775A1 (en) 2002-03-27
EP1189775A4 (en) 2004-09-01
US7384054B2 (en) 2008-06-10
ES2282098T3 (es) 2007-10-16
JP2002541015A (ja) 2002-12-03

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