EP0574737B1 - Véhicule à propulsion électrique à alimentation par accumulateurs, en particulier Chariot-élévateur - Google Patents

Véhicule à propulsion électrique à alimentation par accumulateurs, en particulier Chariot-élévateur Download PDF

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Publication number
EP0574737B1
EP0574737B1 EP93108385A EP93108385A EP0574737B1 EP 0574737 B1 EP0574737 B1 EP 0574737B1 EP 93108385 A EP93108385 A EP 93108385A EP 93108385 A EP93108385 A EP 93108385A EP 0574737 B1 EP0574737 B1 EP 0574737B1
Authority
EP
European Patent Office
Prior art keywords
pump
differential pressure
pressure
control valve
valve
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.)
Expired - Lifetime
Application number
EP93108385A
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German (de)
English (en)
Other versions
EP0574737A1 (fr
Inventor
Peter Dipl.-Ing. Dibbern (Fh)
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.)
Jungheinrich AG
Original Assignee
Jungheinrich 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 Jungheinrich AG filed Critical Jungheinrich AG
Publication of EP0574737A1 publication Critical patent/EP0574737A1/fr
Application granted granted Critical
Publication of EP0574737B1 publication Critical patent/EP0574737B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks
    • B66F9/22—Hydraulic devices or systems

Definitions

  • the battery feeds both the travel drive and the drive for at least one hydraulic pump that supplies the hydraulic systems.
  • this can also include a power steering assist device.
  • a hydraulic consumer is usually supplied from the pump via a directional valve via which the volume flow flowing to the consumer is set.
  • the pump must be driven so that a desired volume flow is actually achieved. If no special control is provided, the pump must be operated at maximum speed or maximum output. However, if the directional control valve is only partially open, considerable throttling losses occur. For secondary functions, i.e. for smaller hydraulic consumers, the throttling losses are very high due to the very low required flow rate
  • EP-A-0 251 290 has also disclosed a Signal from a hydraulic steering device, which is dependent on the pressure in a control signal line behind the steering valve, to give a signal to the pulse control of an electric motor that drives the pump.
  • Electric motors for the traction drive and / or the hydraulic pump are usually direct current motors which are controlled via a pulse operation.
  • a good speed control can be carried out with the help of the pulse control.
  • a constant feed pump can therefore be used to regulate the volume flow, the volume flow then being dependent on the engine speed. It is also already known, in the case of such pulse controls in auxiliary hydraulic drives, to control the pump constantly, that is to say to a maximum required volume flow, with fine control via throttling in the directional control valve.
  • the invention has for its object to provide a vehicle with battery-electric traction drive, in particular rear loader, in which the efficiency of the working hydraulic circuit is improved.
  • the delivery rate is adjusted to the required volume flow. Throttle losses do not occur because disturbance variables are also recorded.
  • the pressure adjusts to the pressure of the consumer plus the pressure loss. This is done according to the invention in that a pressure difference is determined from the outlet pressure of the pump and the pressure behind the control valve. This differential pressure, which is measured with the help of a suitable sensor, is converted into an actual value signal, which together is given to a controller with a predetermined setpoint. The control signal from the controller is then switched to pulse control. For a given setting of the valve, the pressure difference depends on the volume flow coming from the pump. If this is low, the pressure difference is also small and a relatively high control deviation arises in the controller, which has the consequence that the speed of the pump motor is increased via the pulse control.
  • a differential pressure meter 22 is provided, which is connected to the outlet of the pump 14 and to the line behind the valve 18.
  • the pressure meter 22 which has, for example, a differential pressure piston or a differential pressure membrane, the displacement of the piston or the membrane being converted into an electrical signal, measures the pressure drop across the more or less open valve 18.
  • the differential pressure is compared with a setpoint 24, according to which a controller 26 outputs an actuating signal to the pulse controller 16 in accordance with the control deviation.
  • the setpoint is constant and corresponds, for example, to the pressure difference of the valve when the position is fully open and the maximum pump volume flow. It can be seen that the delivery rate of the pump 14 is adjusted to the required volume flow Q erf . Throttle losses do not occur because the disturbance variables are also recorded.
  • the pump pressure adjusts to the load pressure plus the pressure losses. In the control described, the delivery rate requested by the valve position is a system parameter. A change in the valve position is treated like a disturbance variable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)

Claims (4)

  1. Véhicule à propulsion électrique par batterie, en particulier chariot élévateur, comportant un dispositif de levage par vérin pour son équipement de levage, une pompe hydraulique, un moteur électrique pour la pompe, moteur dont la vitesse de rotation est commandée par une commande par impulsions, et une soupape de commande placée entre la pompe et le dispositif de levage par vérin, caractérisé en ce qu'un manomètre différentiel crée, à partir de la pression à la sortie de la pompe (14), et de la pression après la soupape de commande (18), un signal de différence de pression, et en ce qu'un régulateur (26), en comparant le signal de différence de pression à une valeur de consigne (24) prédéfinie, fournit une grandeur de réglage pour la commande à impulsions (16).
  2. Véhicule suivant la revendication 1, caractérisé en ce que la valeur de consigne (24) est constante.
  3. Véhicule suivant la revendication 1 ou la revendication 2, caractérisé en ce que la valeur de consigne (24) correspond à la chute de pression qui, lorsque la soupape de commande (18) est complètement ouverte, existe dans celle-ci pour le débit maximal en volume (Qmax) de la pompe.
  4. Véhicule suivant l'une des revendications 1 à 3, caractérisé en ce que le manomètre différentiel (22) comporte un organe mobile sur lequel sont appliquées les deux pressions, et dont la position est mesurée et est transformée en un signal électrique de pression différentielle.
EP93108385A 1992-06-17 1993-05-25 Véhicule à propulsion électrique à alimentation par accumulateurs, en particulier Chariot-élévateur Expired - Lifetime EP0574737B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4219787A DE4219787C1 (de) 1992-06-17 1992-06-17 Fahrzeug mit batterie-elektrischem Fahr-Antrieb, insbesondere Hublader
DE4219787 1992-06-17

Publications (2)

Publication Number Publication Date
EP0574737A1 EP0574737A1 (fr) 1993-12-22
EP0574737B1 true EP0574737B1 (fr) 1996-09-04

Family

ID=6461187

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93108385A Expired - Lifetime EP0574737B1 (fr) 1992-06-17 1993-05-25 Véhicule à propulsion électrique à alimentation par accumulateurs, en particulier Chariot-élévateur

Country Status (2)

Country Link
EP (1) EP0574737B1 (fr)
DE (2) DE4219787C1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4402653C2 (de) * 1994-01-29 1997-01-30 Jungheinrich Ag Hydraulische Hubvorrichtung für batteriebetriebene Flurförderzeuge
DE19612582A1 (de) * 1996-03-29 1997-10-02 Miag Fahrzeugbau Gmbh Antriebseinheit für ein Fahrzeug
DE19744429A1 (de) * 1997-10-08 1999-04-22 Still Wagner Gmbh & Co Kg Flurförderfahrzeug mit einer Lastaufnahmevorrichtung und Verfahren zum Absenken der Lastaufnahmevorrichtung
DE10033223A1 (de) * 2000-07-07 2002-01-17 Dambach Lagersysteme Gmbh Verfahren zur Steuerung einer hydraulischen Antriebseinheit in einem Regalbediengerät

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3270266D1 (en) * 1981-08-10 1986-05-07 Clark Equipment Co Vehicle and hydraulic system with single pump therefor
DE3660226D1 (en) * 1985-02-04 1988-06-30 Hitachi Construction Machinery Control system for hydraulic circuit
DE3622218A1 (de) * 1986-07-02 1988-01-14 Still Gmbh Kraftfahrzeug, vorzugsweise flurfoerderzeug, mit einer hydraulischen arbeitseinrichtung und mit einer hydraulischen lenkhilfskraftunterstuetzungseinrichtung
EP0379595B1 (fr) * 1988-07-08 1993-09-29 Hitachi Construction Machinery Co., Ltd. Appareil hydrodynamique
DE4026695C2 (de) * 1989-08-25 1995-04-20 Toyoda Automatic Loom Works Hydraulikfluid-Durchflußsteuerung für ein Hydrauliksystem eines Industriefahrzeugs
JPH03159879A (ja) * 1989-11-20 1991-07-09 Toyota Autom Loom Works Ltd 産業車両の荷役制御装置
JP2828490B2 (ja) * 1990-06-19 1998-11-25 日立建機株式会社 ロードセンシング油圧駆動回路の制御装置
WO1992010684A1 (fr) * 1990-12-15 1992-06-25 Barmag Ag Systeme hydraulique
US5138838A (en) * 1991-02-15 1992-08-18 Caterpillar Inc. Hydraulic circuit and control system therefor

Also Published As

Publication number Publication date
EP0574737A1 (fr) 1993-12-22
DE4219787C1 (de) 1994-01-05
DE59303622D1 (de) 1996-10-10

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