WO2015156708A1 - Ensemble de direction - Google Patents

Ensemble de direction Download PDF

Info

Publication number
WO2015156708A1
WO2015156708A1 PCT/SE2014/000044 SE2014000044W WO2015156708A1 WO 2015156708 A1 WO2015156708 A1 WO 2015156708A1 SE 2014000044 W SE2014000044 W SE 2014000044W WO 2015156708 A1 WO2015156708 A1 WO 2015156708A1
Authority
WO
WIPO (PCT)
Prior art keywords
steering
assembly
feedback
vehicle
fluid
Prior art date
Application number
PCT/SE2014/000044
Other languages
English (en)
Inventor
Vilhelm FREDRIKSSON
Original Assignee
Volvo Construction Equipment Ab
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 Volvo Construction Equipment Ab filed Critical Volvo Construction Equipment Ab
Priority to PCT/SE2014/000044 priority Critical patent/WO2015156708A1/fr
Publication of WO2015156708A1 publication Critical patent/WO2015156708A1/fr

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D12/00—Steering specially adapted for vehicles operating in tandem or having pivotally connected frames
    • 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
    • B62D5/09—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 means for actuating valves
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/0841—Articulated frame, i.e. having at least one pivot point between two travelling gear units
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/225—Control of steering, e.g. for hydraulic motors driving the vehicle tracks
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2296—Systems with a variable displacement pump

Definitions

  • the present disclosure relates to a steering assembly for a vehicle according to the preamble of claim 1. Furthermore, the present disclosure relates to a method for steering a vehicle. Additionally, the present disclosure relates to a feedback assembly.
  • the steering assembly can be applied on working machines within the fields of industrial construction machines or construction equipment, in particular wheel loaders. Although the steering assembly will be described with respect to a wheel loader, the steering assembly is not restricted to this particular machine, but may also be used in other working machines such as articulated haulers, or other frame-steered machines or vehicles, and excavators and backhoe loaders.
  • An articulated frame-steered vehicle such as a wheel loader, may be steered by a hydraulic steering assembly in which a hydraulic fluid, such as oil, is fed to steering cylinders in response to the actuation of a steering control device, such as a steering wheel.
  • a hydraulic fluid such as oil
  • the operator actuates the steering control device resulting in that hydraulic fluid is feed to the steering cylinders.
  • the flow to the steering cylinders is terminated.
  • a hydraulic steering assembly may comprise a steering valve and a fluid flow metering unit that is located between the steering valve and the steering cylinders, as seen in the flow direction of hydraulic fluid.
  • the fluid flow metering unit is generally mechanically connected to the steering valve.
  • An object of the present disclosure is to provide a steering assembly for a vehicle in which the steering angle change feedback is improved.
  • the present disclosure relates to a steering assembly for a vehicle.
  • the steering assembly comprises a steering means adapted to impart a steering angle change to the vehicle in response to a steering input.
  • the steering assembly comprises a feedback assembly adapted to provide a steering angle change output.
  • the steering assembly is adapted to interrupt the change of the steering angle when the steering angle change output is indicative of that the steering angle change according to the steering input has been reached.
  • the feedback assembly comprises a means for converting the actual steering angle change into a fluid signal. Since the feedback assembly of the steering assembly according to the present disclosure is adapted to convert the actual steering angle change into a fluid signal, rather than providing an estimate of the steering angle change by metering the fluid flow to the steering cylinders as is generally done in traditional hydraulic steering assemblies for instance, the accuracy of the steering assembly may be improved. Moreover, the fact that the feedback assembly converts the actual steering angle change, rather than an estimate thereof, into a fluid signal implies that the actuation of the steering control device will be more intuitive for the operator. For instance, if an operator of the steering assembly of the present disclosure changes the steering angle from a first steering angle to a second steering angle and then back again to the first steering angle, the steering control device will be in substantially the same position as before the operator initiated the two steering operations.
  • the feedback assembly may comprise a means that converts a mechanical rotation, which is indicative of an actual steering angle change, into a fluid signal.
  • the feedback assembly may comprise a means that converts a relative rotation between the first and second vehicle portions into a fluid signal.
  • the feedback assembly converts the actual steering angle change into a fluid signal rather than any other type of signal, such as an electrical signal, implies that a steering assembly that comprises a fluid-operated steering means may be adapted to receive the fluid signal produced by the feedback assembly.
  • the fact that the feedback assembly converts the actual steering angle change into a fluid signal implies that a fluid-operated steering assembly may be obtained by converting a traditional fluid-operated steering assembly, in which the steering angle change is estimated by the fluid flow towards the steering cylinders, into an embodiment of a steering assembly of the present disclosure.
  • the feedback assembly is adapted to provide variable feedback such that the fluid signal, in relation to a certain steering angle change, can be varied.
  • the feedback assembly is adapted to provide variable feedback in relation to the speed of the vehicle.
  • a feedback assembly implies that the sensitivity of the steering assembly may be changed, based on certain conditions such as the speed of the vehicle.
  • the feedback pump comprises a variable displacement pump.
  • a variable displacement pump is a cost efficient way to obtain a feedback assembly that is adapted to provide variable feedback.
  • the steering means is a fluid-operated steering means.
  • the feedback assembly can send the fluid signal to a previously known orbitrol or the like. This in turn implies that when the steering means is a fluid-operated steering means, a steering assembly with a feedback assembly providing a fluid signal may be assembled in a straightforward manner.
  • the steering assembly further comprises a fluid control assembly adapted to control a fluid communication between the steering means and a fluid source.
  • the steering assembly comprises a metering means adapted to receive the steering angle change output.
  • the steering assembly is adapted to close the fluid supply to the steering means when the steering angle change output is indicative of that the steering angle change according to the steering input has been reached.
  • a second aspect of the present disclosure relates to a vehicle comprising a steering assembly according to the first aspect of the present disclosure.
  • the vehicle is an articulated vehicle comprising a first portion and a second portion, the first and second portions being pivotally connected to one another in order to obtain the steering angle.
  • the first and second portions are pivotally connected to one another via a pivot shaft and at least a first portion of the feedback pump is connected to the pivot shaft.
  • a third aspect of the present disclosure relates to a method for steering a vehicle using a steering assembly which comprises a feedback assembly, the method comprises:
  • a fourth aspect of the present disclosure relates to a feedback assembly for an articulated vehicle steering assembly.
  • the articulated vehicle comprises a first vehicle portion and a second vehicle portion
  • the first portion may be a front portion and the second portion may be a rear portion of the vehicle.
  • the first portion may be the rear portion and the second portion may be the front portion of the vehicle
  • the first and second portions are pivotally connected to one another via a pivot shaft.
  • the pivot shaft is fixedly attached to the second portion.
  • the feedback assembly comprises a feedback pump which in turn comprises a first feedback pump portion that is adapted to be connected the pivot shaft and a second feedback pump portion that is adapted to be connected to the first vehicle portion, the feedback pump being adapted to convert an actual steering angle change into a fluid signal.
  • the feedback pump is a rotational pump.
  • the feedback assembly comprises a transmission unit that is adapted to be located between the pivot shaft and the first feedback pump portion.
  • Fig. 1 is a schematic illustration of a wheel loader
  • Fig. 2 is a schematic illustration of a steering assembly according to an embodiment of the present disclosure
  • Fig. 3 is a schematic illustration of a steering assembly according to an embodiment of the present disclosure
  • Fig. 4 is a side view of an implementation of a feedback assembly
  • Fig. 5 is a top view of a portion of the Fig. 4 feedback assembly.
  • Fig. 1 is an illustration of a vehicle 10 in the form of a working machine.
  • the Fig. 1 working machine is exemplified as a wheel loader.
  • the vehicle 10 is an articulated vehicle which comprises a first portion 12 and a second portion 14.
  • the first and second portions 12, 14 are pivotally connected to one another in order to obtain a steering angle, i.e. to steer the vehicle.
  • the relative inclination around a substantially vertical pivot axis between the first and second portions 12, 14 defines the steering angle of the vehicle 10.
  • the Fig. 1 vehicle 10 comprises a steering assembly 16 which in turn comprises a steering means 18, or a steering imparting arrangement 18.
  • the steering means 18 is adapted to impart a steering angle change to the vehicle 10 in response to a steering input.
  • the steering means 18 is fluid-operated, e.g. hydraulic.
  • the steering means 18 may comprise one or more fluid operated cylinders.
  • other embodiments of the steering assembly 16 may comprise other types of steering means for changing the steering angle.
  • implementations of the steering means 18 may comprise an electric actuator (not shown) and/or a mechanical actuator (not shown) that may be connected to the drive line (not shown) of the vehicle 10.
  • Fig. 2 illustrates an embodiment of the steering assembly 16 according to the present invention.
  • the Fig. 2 embodiment of the steering assembly 16 is a fluid operated steering assembly that comprises a fluid-operated steering means 18 adapted to impart a steering angle change to the vehicle (not shown in Fig. 2) in response to a steering input.
  • the Fig. 2 steering means 18 in turn comprises a first fluid operated cylinder 20 and a second fluid operated cylinder 22.
  • the first portion 12 of the vehicle 10 defines a first axis 12' and a second portion 14 of the vehicle 10 defines a second axis 14' and the first and second portions 12, 14 are pivotally connected to one another such that the first and second axes 12', 14' define the steering angle.
  • the first and second axes 12', 14' are parallel to each other resulting in that the steering angle is zero.
  • the first portion 12 is the front portion of the vehicle and the second portion 14 is the rear portion of the vehicle 10.
  • the first portion 2 may be the rear portion and the second portion 4 may be the front portion.
  • the Fig. 2 steering assembly 16 comprises a steering actuator 24 which in the Fig. 2 embodiment is implemented as a steering wheel.
  • a steering actuator may be implemented as a joystick, lever or the like.
  • the steering assembly further comprises a fluid control assembly 26 adapted to control a fluid communication between the steering means 18, e.g. the first and second fluid operated cylinders 20, 22 in the Fig. 2 embodiment, and a fluid source 28.
  • the fluid source may comprise a fluid pump 30 and/or a fluid tank 32.
  • the steering actuator 24 is in the Fig. 2 embodiment mechanically connected to the fluid control assembly 26, such as a valve, for instance via a control rod.
  • the fluid control assembly 26 may for instance be adapted to assume a condition in which a fluid communication is provided between the fluid pump 30 and each one of a bottom chamber of the first cylinder 20 and a piston rod side chamber of the second cylinder 22.
  • the condition assumed by the fluid control assembly 26 may provide a fluid communication between the fluid tank 32 and each one of a piston rod side chamber of the first cylinder 20 and a bottom chamber of the second cylinder 22.
  • the valve may comprise a spool (not shown) which may be rotated in relation to a valve housing (not shown) in order to selectively provide fluid communications between the portions, e.g. a tank and/or a pump, of the fluid source 28 and portions, e.g. chambers of a first and a second cylinder, of the steering means 18.
  • a spool (not shown) which may be rotated in relation to a valve housing (not shown) in order to selectively provide fluid communications between the portions, e.g. a tank and/or a pump, of the fluid source 28 and portions, e.g. chambers of a first and a second cylinder, of the steering means 18.
  • valve that comprises a spool and which valve could be adapted to form part of a steering assembly 16 of the present invention, for instance to be adapted to form part of any one of the embodiments of the steering assembly 16 which are disclosed in relation to Fig. 2 or Fig. 3, is disclosed in GB 2 318 773.
  • the steering assembly comprises a feedback assembly 34 adapted to provide a steering angle change output.
  • the steering assembly 16 is adapted to interrupt the change of the steering angle when the steering angle change output is indicative of that the steering angle change according to the steering input has been reached.
  • the feedback assembly 34 comprises a means for converting the actual steering angle change into a fluid signal.
  • the feedback assembly 34 is adapted to convert the actual steering angle change into a fluid signal.
  • the means may generally be adapted to convert a mechanical rotation, which is indicative of an actual steering angle change, for instance the relative rotation between the first and second vehicle portions 12, 14, into a fluid signal.
  • Such a means may be implemented in a plurality of ways.
  • the means may comprise a meter (not shown) that measures the relative rotation between the first and second vehicle portions 12, 14 and thereafter, for instance using an electronic control unit that in turn utilizes a look-up table and/or a continuous function, determines an appropriate fluid signal and thereafter generates the fluid signal thus determined using a fluid signal generating means such as a pressurized fluid tank (not shown), a fluid cylinder (not shown) or a rotational pump (not shown).
  • a fluid signal generating means such as a pressurized fluid tank (not shown), a fluid cylinder (not shown) or a rotational pump (not shown).
  • the implementation of the feedback assembly 34 illustrated in Fig. 2 comprises a feedback pump 36.
  • the Fig. 2 implementation of the feedback assembly 34 comprises a feedback pump 36 that comprises two directions of flow.
  • other implementations of the feedback assembly 34 may comprise two feedback pumps (not shown), one for each flow direction.
  • the fluid signal comprises a fluid flow, preferably a hydraulic fluid flow.
  • a feedback assembly 34 may provide a fluid pressure, e.g. a hydraulic pressure, as a fluid signal.
  • the steering assembly 16 comprises a metering means 38 adapted to receive the steering angle change output.
  • the steering assembly 16 is adapted to close the fluid communication between the steering means 18 and the and the fluid source 28 when the steering angle change output is indicative of that the steering angle change according to the steering input has been reached.
  • the feedback assembly 34 is in fluid communication with the metering means 38.
  • the feedback assembly 34 comprises a feedback conduit assembly 40 adapted to provide a fluid communication between the feedback pump 36 and the metering means 38.
  • the feedback pump 36 is arranged so as to pump fluid towards the metering means 38 in relation to the steering angle change.
  • the metering means 38 is implemented as a fluid motor.
  • the metering means 38 is connected, for instance mechanically connected, to the fluid control assembly 26.
  • the metering means 38 may be adapted to interact with the fluid control assembly 26 such that when a fluid signal from the feedback assembly 34 indicates that the steering angle change according to the steering input has been reached, the fluid control assembly 26 closes the fluid communication between the fluid source 28 and the steering means 18.
  • the steering assembly 16 may comprise a fluid control aggregate (not shown) which comprises the fluid control assembly 26 as well as the metering means 38.
  • a fluid control aggregate may be referred to as an orbitrol.
  • the feedback assembly 34 may be adapted to provide variable feedback such that said fluid signal, in relation to a certain steering angle change, can be varied.
  • the feedback assembly 34 may comprise a variable displacement feedback pump.
  • the feedback assembly 34 may comprise a shunt means (not shown) adapted to shunt a portion of the fluid signal.
  • the feedback assembly 34 may be adapted to provide variable feedback in relation to the speed of the vehicle.
  • the metering means 38 may be adapted to provide for variable metering of the hydraulic signal.
  • the metering means 38 may comprise a fluid motor with variable displacement (not shown).
  • Fig. 3 illustrates another embodiment of a steering assembly 16. As may be gleaned from the Fig. 3 embodiment, the steering assembly 16 disclosed therein is a load sensing system with a variable displacement fluid pump 30.
  • Figs. 4 and 5 illustrate a preferred implementation of the feedback assembly 34 for an articulated vehicle steering assembly 16.
  • the feedback assembly 34 may be used in the Fig. 2 or the Fig. 3 embodiments of the steering assembly 16.
  • the articulated vehicle comprises a first vehicle portion 12 and a second vehicle portion 14.
  • the first and second portions 12, 14 are pivotally connected to one another via a pivot shaft 42.
  • the pivot shaft is fixedly attached to the second portion 14.
  • the first portion 12 is the front portion of the vehicle and the second portion 14 is the rear portion of the vehicle 10.
  • the first portion 12 may be the rear portion and the second portion 14 may be the front portion.
  • the feedback assembly 34 comprises a feedback pump 36 which in turn comprises a first feedback pump portion 36A that is adapted to be connected the pivot shaft 42 and a second feedback pump portion 36B that is adapted to be connected to the first vehicle portion 12.
  • the second feedback pump portion 36B is connected to the first vehicle portion 12 by means of a strut 44 although other connection options, such as at least one of a housing or a spline joint (not shown), are possible.
  • the feedback pump in the Fig. 4 implementation is adapted to convert an actual steering angle change into a fluid signal.
  • the feedback pump 36 is a rotational pump.
  • the first feedback pump portion 36A need not be attached directly to the pivot shaft 42. Instead, the first feedback pump portion 36A may be connected to the pivot shaft 42 via a transmission unit 46 that is adapted to be located between the pivot shaft 42 and the first feedback pump portion 36A.
  • the transmission unit 46 may be adapted to have a gear ratio such that a certain steering angle change results in a larger relative rotation between the first and second feedback pump portions 36A, 36B.
  • Fig. 5 illustrates a top view of a portion of the Fig. 4 feedback assembly 34. It is to be understood that the present invention is not limited to the embodiments described above and illustrated in the drawings; rather, the skilled person will recognize that many changes and modifications may be made within the scope of the appended claims.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Steering Control In Accordance With Driving Conditions (AREA)
  • Power Steering Mechanism (AREA)

Abstract

La présente invention concerne un ensemble de direction (16) pour un véhicule (10). L'ensemble de direction (16) comprend un moyen de direction (18) conçu pour conférer un changement d'angle de direction au véhicule (10) en réponse à une entrée de direction. L'ensemble de direction (16) comprend un ensemble de rétroaction (34) conçu pour fournir une sortie de changement d'angle de direction. L'ensemble de direction (16) est conçu pour interrompre le changement de l'angle de direction lorsque la sortie de changement d'angle de direction indique que le changement d'angle de direction selon l'entrée de direction a été atteint. L'ensemble de rétroaction (34) comprend un moyen pour convertir le changement d'angle de direction réel en un signal de fluide.
PCT/SE2014/000044 2014-04-08 2014-04-08 Ensemble de direction WO2015156708A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/SE2014/000044 WO2015156708A1 (fr) 2014-04-08 2014-04-08 Ensemble de direction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2014/000044 WO2015156708A1 (fr) 2014-04-08 2014-04-08 Ensemble de direction

Publications (1)

Publication Number Publication Date
WO2015156708A1 true WO2015156708A1 (fr) 2015-10-15

Family

ID=54288157

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2014/000044 WO2015156708A1 (fr) 2014-04-08 2014-04-08 Ensemble de direction

Country Status (1)

Country Link
WO (1) WO2015156708A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11447374B2 (en) 2016-09-15 2022-09-20 Terex Australia Pty Ltd Crane counterweight and suspension

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3370422A (en) * 1966-03-10 1968-02-27 Int Harvester Co Steering control system
US4003202A (en) * 1976-03-11 1977-01-18 General Signal Corporation Variable feedback steering system
US4703819A (en) * 1985-02-27 1987-11-03 Nissan Motor Co., Ltd. Full hydraulic power steering system
US5263321A (en) * 1990-12-28 1993-11-23 Danfoss A/S Control arrangement for a fully-hydraulic steering system
US5303636A (en) * 1990-04-23 1994-04-19 Eaton Corporation Fluid controller and logic control system for use therewith
US5937966A (en) * 1996-10-30 1999-08-17 Volvo Construction Equipment Korea Co., Ltd. Power steering system for construction equipment
US6193009B1 (en) * 1998-07-24 2001-02-27 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Electromagnetic valve for a vehicle and a power steering device
US20040011587A1 (en) * 2002-04-18 2004-01-22 Eugen Stall Hydraulic steering device
US20130245892A1 (en) * 2012-03-15 2013-09-19 Chenyao Chen Synchronous Steering Control

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3370422A (en) * 1966-03-10 1968-02-27 Int Harvester Co Steering control system
US4003202A (en) * 1976-03-11 1977-01-18 General Signal Corporation Variable feedback steering system
US4703819A (en) * 1985-02-27 1987-11-03 Nissan Motor Co., Ltd. Full hydraulic power steering system
US5303636A (en) * 1990-04-23 1994-04-19 Eaton Corporation Fluid controller and logic control system for use therewith
US5263321A (en) * 1990-12-28 1993-11-23 Danfoss A/S Control arrangement for a fully-hydraulic steering system
US5937966A (en) * 1996-10-30 1999-08-17 Volvo Construction Equipment Korea Co., Ltd. Power steering system for construction equipment
US6193009B1 (en) * 1998-07-24 2001-02-27 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Electromagnetic valve for a vehicle and a power steering device
US20040011587A1 (en) * 2002-04-18 2004-01-22 Eugen Stall Hydraulic steering device
US20130245892A1 (en) * 2012-03-15 2013-09-19 Chenyao Chen Synchronous Steering Control

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11447374B2 (en) 2016-09-15 2022-09-20 Terex Australia Pty Ltd Crane counterweight and suspension

Similar Documents

Publication Publication Date Title
CN107893786B (zh) 工程机械的控制系统及工程机械的控制方法
US6408977B1 (en) Hydraulic steering system for a vehicle, especially for a mobile working machine
EP2827218B1 (fr) Manette de jeu avec commande améliorée pour véhicules de chantier
US9863449B2 (en) Hydraulic system and a method for controlling a hydraulic system
US7467514B2 (en) System and method for controlling shakability of a work tool
EP2795003B1 (fr) Procédé pour commander l'abaissement d'un accessoire d'une machine de travail
KR102564414B1 (ko) 건설기계의 주행 제어 시스템 및 건설기계의 주행 제어 방법
US9829014B2 (en) Hydraulic system including independent metering valve with flowsharing
KR102582826B1 (ko) 건설기계의 제어 시스템 및 건설기계의 제어 방법
EP3431783B1 (fr) Système de commande d'écoulement de fluide hydraulique dépendant de la charge
CN109667309B (zh) 温度响应的液压降低
EP3722516A1 (fr) Systeme d'entrainement pour engin de chantier
EP2901025B1 (fr) Valve prioritaire double
WO2015156708A1 (fr) Ensemble de direction
US20130073111A1 (en) Control Device for an Electric Actuator
US11685374B2 (en) Inching system for a construction vehicle
EP2535467A1 (fr) Système de contrôle de pilote hydraulique
KR102121879B1 (ko) 건설기계의 주행 충격 저감 장치 및 이를 이용한 건설기계의 제어방법
US11365801B2 (en) Utility vehicle having adaptive drive limiting control

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 14888875

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 14888875

Country of ref document: EP

Kind code of ref document: A1