EP0539589B1 - Procede et unite de commande de vehicule pour operation de chargement - Google Patents

Procede et unite de commande de vehicule pour operation de chargement Download PDF

Info

Publication number
EP0539589B1
EP0539589B1 EP91912321A EP91912321A EP0539589B1 EP 0539589 B1 EP0539589 B1 EP 0539589B1 EP 91912321 A EP91912321 A EP 91912321A EP 91912321 A EP91912321 A EP 91912321A EP 0539589 B1 EP0539589 B1 EP 0539589B1
Authority
EP
European Patent Office
Prior art keywords
torque
engine
pump
hydraulic pump
capacity
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
EP91912321A
Other languages
German (de)
English (en)
Other versions
EP0539589A4 (fr
EP0539589A1 (fr
Inventor
Masanori Komatsu Mec Kabushiki Kaisha Ikari
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.)
Komatsu Ltd
Komatsu MEC Corp
Komatsu MEC KK
Original Assignee
Komatsu Ltd
Komatsu MEC Corp
Komatsu MEC KK
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 Komatsu Ltd, Komatsu MEC Corp, Komatsu MEC KK filed Critical Komatsu Ltd
Publication of EP0539589A1 publication Critical patent/EP0539589A1/fr
Publication of EP0539589A4 publication Critical patent/EP0539589A4/en
Application granted granted Critical
Publication of EP0539589B1 publication Critical patent/EP0539589B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2232—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps
    • E02F9/2235—Control of flow rate; Load sensing arrangements using one or more variable displacement pumps including an electronic controller
    • 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
    • E02F9/2246—Control of prime movers, e.g. depending on the hydraulic load of work tools
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
    • F02D29/04—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving pumps

Definitions

  • the present invention relates to a control unit and a control method for a construction vehicle mainly for loading work such as a wheel loader, etc.
  • FIG. 7 A conventional control system of a unit for controlling a wheel loader mainly for loading work is illustrated in Fig. 7.
  • the engine E is controlled by way of a governor gv through a linkage li by operating an accelerating pedal ap.
  • the output of the engine E is transmitted to a torque converter T and a gear G and the output transmitted to the gear G drives a variable capacity hydraulic pump PV.
  • the variable capacity hydraulik pump PV is controlled by a variable capacity hydraulic pump control valve pc by way of a servo cylinder SC so as to control the amount of oil under pressure.
  • a bucket operation pilot valve AL When a bucket operation pilot valve AL is operated to actuate a bucket main operation valve AV to thereby turn a bucket A by way of a bucket cylinder AC, so that the bucket A tilts rearward or dumps forward.
  • a boom operation pilot valve BL When a boom operation pilot valve BL is operated to actuate a boom main operation valve BV to thereby turn a boom B by way of a boom cylinder BC, the boom B lifts upward or lowers downward.
  • Designated at PP is a pilot pump.
  • the pressure versus flow rate characteristic diagram of the variable capacity hydraulic pump in the conventional control system of a loading machine is illustrated in Fig. 8.
  • the hydraulic pump torque at high pressure can be limited to a necessary and sufficient amount by varying the flow rate Q according to the pump discharge hydraulic pressure P corresponding to the maximum hydraulic pump torque T X1 or T X2 .
  • the output of the engine E is distributed to the hydraulic pump PV and the power transmission device of the driving mechanism (torque converter T) as illustrated in Figs.
  • US-A-4,015,482 discloses a control system for an engine driven power train having a variable torque absorption transmission mechanism including a torque converter in conjunction with a hydraulic control circuit for the implement of an excavating-loading vehicle such as a loader. Therein an adaption of the driven unit to the available power is effectuated by a clutch, which is unfortunately subject to losses under certain working conditions.
  • a control system for a hydraulic excavator which has a prime mover, a revolution number control device for the prime mover, at least one variable displacement hydraulic pump driven by the prime mover, a displacement volume control device for the pump, actuators driven by pressurized fluid discharged from the pump and working elements driven by the respective actuators such that the pump is used for the trave as well as the working mode of operation.
  • JP 63-154874 discloses a controller for a variable displacement hydraulic pump judging whether an engine is overheated or not based on temperature sensor signals.
  • the present invention provides a unit for controlling a vehicle for loading operation which carries a variable capacity hydraulic pump for operating a loading machine and a torque converter for driving itself, the control unit comprising an engine provided with an electronically controlled governor capable of selecting stepwise the output characteristic of the engine, electromagnetic changeover valves for setting stepwise the maximum capacity and the output torque of the variable capacity hydraulic pump, a pump capacity detector, an hydraulic pressure detector, a switch for selecting the output characteristics of the engine and the variable capacity hydraulic pump (hereinafter referred to M mode control switch), an electronic governor controller for controlling engine output characteristics and a variable capacity pump controller for selectively setting the maximum capacity and the output torque characteristics of the variable capacity hydraulic pump, so as to control the amounts and distribution of the hydraulic output and the driving output by selecting the M mode control switch for the improvement of operability.
  • M mode control switch a switch for controlling engine output characteristics and a variable capacity pump controller for selectively setting the maximum capacity and the output torque characteristics of the variable capacity hydraulic pump, so as to control the amounts and distribution of the hydraulic output and the driving output by selecting the M mode control
  • control unit is equipped with a selective switch capable of selecting stepwise the cut-off pressure of the discharge flow of the variable capacity pump (hereinafter referred to L mode control switch).
  • L mode control switch capable of selecting stepwise the cut-off pressure of the discharge flow of the variable capacity pump
  • Fig. 1 is a view showing the control system of a vehicle for loading work according to an embodiment of the present invention
  • Fig. 2 is a view for explaining the pressure versus flow rate characteristic curve of a variable capacity pump PV
  • Figs. 3(a), 3(b) and 3(c) are diagrams for explaining the distributions of power by a combination of M 1 mode and L 1 mode, by a combination of M 2 mode and L 2 mode and by a combination of M 3 mode and L 3 mode respectively
  • Figs. 4(a) and 4(b) respectively shows flowcharts of the control method of loading machine according to the present invention
  • Fig. 1 is a view showing the control system of a vehicle for loading work according to an embodiment of the present invention
  • Fig. 2 is a view for explaining the pressure versus flow rate characteristic curve of a variable capacity pump PV
  • Figs. 3(a), 3(b) and 3(c) are diagrams for explaining the distributions of power by a combination of M 1 mode and L 1 mode, by
  • FIG. 5 is a diagram for explaining a control method for reducing the setting of an engine torque in response to a hydraulic torque
  • Figs 6(a) and 6(b) are views for explaining the power distribution matrix of the loading machine hydraulic pressure L and the driving force M
  • Figs. 7, 8 and 9 are diagrams for explaining a conventional control unit.
  • Fig. 1 is a block diagram showing the control system of a vehicle for loading work according to an embodiment of present invention wherein elements which operate in the same way as the conventional system as explained in Fig. 7 are denoted at the same numerals.
  • An engine E has an electronically controlled governor 10 which is mounted thereon and is capable of optionally selecting output characteristics stepwise and an electronic governor controller 11 is provided for controlling the electronically controlled governor 10 in response to input signals (1) to (4) set forth hereunder.
  • variable capacity pump controller 41 receives signals from and sends signals to the electronic governor controller 11 and outputs a signal to an electromagnetic pilot valve 46 to thereby selectively switch the electromagnetic pilot valve 46. Further the variable capacity pump controller 41 receives the following signals:
  • FIG. 2 shows the hydraulic pressure versus flow rate characteristic curves of the variable capacity pump PV according to an embodiment of the present invention. It is possible to set stepwise a plurality of M modes such as M1 mode, M2 mode and M3 mode by operating the M mode control switch 42 thereby to set the torque characteristics of the engine E as indicated by the engine torque curves at M1 mode, M2 mode and M3 mode by way of the electronically controlled governor 10, and it is possible to set stepwise the maximum hydraulic pressure of the loading machine in a plurality of L modes such as L1 mode, L2 mode and L3 mode by selectively setting the torque characteristic of the engine E in accordance with the setting of the M mode control switch 42 among those indicated by the engine torque curves of M1, M2 and M3 modes illustrated respectively in Figs. 3(a), 3(b) and 3(c) by way of the electronically controlled governor 10 and by operating the L mode control switch 43.
  • M modes such as M1 mode, M2 mode and M3 mode
  • the maximum torque points are B 1 , B 2 and B 3
  • the hydraulic torques at the maximum torque points are T B1 , T B2 and T B3 respectively
  • the absorption torque points of the torque converters at the maximum torque points are B 1 ', B 2 ' and B 3 ' respectively as illustrated in Figs. 3(a), 3(b) and 3(c), so that it is possible to conform the order in strength of hydraulic torques, i.e., T B1 > T B2 > T B3 to the order in strength of driving forces (absorption torques of the torque converter), i.
  • the maximum engine speeds are changed when the hydraulic torques of the hydraulic pressure P A are around T A1 , T A2 and T A3 , and the absorption torques of the torque converter are A 1 ', A 2 'and A 3 ' respectively when the hydraulic torques are T A1 , T A2 and T A3 .
  • the absorption torques of the torque converter at the points A 4 , A 5 , A 6 , B 4 , B 5 and B 6 on a curve having a same hydraulic pressure in Fig. 2 are respectively changed to those at the points A 4 ' A 5 ' A 6 ', B 4 ', B 5 ' and B 6 ' in Figs.
  • Fig. 4(a) shows a control flowchart of the electronically controlled governor 10 for reducing the set maximum engine speed when the loading machine hydraulic pressure is more than P A1 (or P A2 or P A3 ), the capacity of the pump is cut off and the hydraulic torques are under T A1 (or T A2 or T A3 ), while Fig.
  • FIG. 4(b) shows a control flowchart for controlling the target engine speed according to the loading machine hydraulic pressure when the hydraulic pressure of the loading machine is more than P B1 (or P B2 or P B3 ),the capacity of the pump is cut off and the hydraulic torques are under T B1 (or T B2 or T B3 ).
  • the present invention has also a great effect that it can correspond to various working conditions with ease since the distribution of power between the loading machine and driving mechanism can be selected by matrix, i.e., a combination of two variables.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Operation Control Of Excavators (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

Procédé et unité de commande d'un véhicule pour effectuer les opérations de chargement, unité qui comporte une pompe hydraulique (PV) à débit variable qui fait fonctionner un dispositif de chargement et un convertisseur de couple (T) qui l'entraîne. L'unité de commande comprend un moteur (E) équipé d'un régulateur (10) commandé électroniquement, capable de sélectionner des caractéristiques de sortie en mode incrémentiel; des systèmes (12), (14), (42) et (43) permettant d'établir en mode incrémentiel le débit et le couple de sortie maximum de la pompe hydraulique (PV) à débit variable pour faire fonctionner le dispositif de chargement; des systèmes (44), (45) détectant un débit de la pompe et la pression hydraulique; des commutateurs (42), (43) permettant de sélectionner les caractéristiques de sortie du moteur; une unité de commande (11) du régulateur servant à contrôler les caractéristiques de sortie sélectionnées par les commutateurs de sélection; et une unité de commande (4) de pompe fixant sélectivement les caractéristiques maximums de débit et de couple de sortie de la pompe hydraulique (PV) à débit variable en fonction des caractéristiques de sortie du moteur, sélectionnées par les commutateurs de sélection. Par conséquent, même si le couple hydraulique varie au moment de la forte pression dans la pompe hydraulique à débit variable, on peut réguler la plage variable du couple d'absorption du convertisseur de couple, ceci permettant d'effectuer facilement et efficacement des travaux de ramassage à la pelle de terre et de sable.

Claims (3)

  1. Dispositif de commande d'un véhicule de travaux de chargement, comprenant :
    un moteur (E) qui entraîne une pompe hydraulique à cylindrée variable (PV) pour l'actionnement d'une machine de chargement (A, B) et un convertisseur de couple (T) pour la propulsion du véhicule, le moteur (E) étant pourvu d'un régulateur à commande électronique (10) capable de choisir la caractéristique de sortie de celui-ci par échelons,
    des moyens (12, 14, 42, 43) de fixation par échelons d'une cylindrée et d'un couple de sortie maximaux de la pompe hydraulique à cylindrée variable (PV) pour l'actionnement de la machine de chargement (A, B),
    des moyens (44, 45) de détection de la pression hydraulique et de la cylindrée de la pompe hydraulique à cylindrée variable (PV),
    des commutateurs (42, 43) pour le choix de caractéristiques de sortie du moteur (E),
    un dispositif de commande de régulateur (11) pour la commande des caractéristiques de sortie choisies par les commutateurs (42, 43), et
    un dispositif de commande de pompe (41) pour la fixation optionnelle de la cylindrée maximale et des caractéristiques de couple de sortie de la pompe hydraulique à cylindrée variable (PV) d'après les caractéristiques de sortie du moteur choisies par les commutateurs (42, 43).
  2. Procédé de commande du moteur (E) et de la pompe hydraulique à cylindrée variable (PV) d'un Véhicule de travaux de chargement pourvu du dispositif de commande selon la revendication 1, caractérisé par le fait que la vitesse de rotation maximale fixée du régulateur à commande électronique (10) (caractéristiques de régulation) ou le couple fixé du moteur (E) est réduit d'après la pression hydraulique de refoulement ou le couple hydraulique de sortie de la pompe hydraulique à cylindrée variable (PV).
  3. Procédé de commande de la pompe hydraulique à cylindrée variable (PV) d'un véhicule de travaux de chargement pourvu du dispositif de commande selon la revendication 1, caractérisé par le fait que la caractéristique débit de refoulement-pression de refoulement de la pompe hydraulique à cylindrée variable (PV) est fixée par échelons par le commutateur de pression de coupure (43) et un commutateur de cylindrée et couple de sortie maximaux (42).
EP91912321A 1990-07-18 1991-07-16 Procede et unite de commande de vehicule pour operation de chargement Expired - Lifetime EP0539589B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP187869/90 1990-07-18
JP2187869A JP2520771B2 (ja) 1990-07-18 1990-07-18 積み込み作業車両の制御方法及び装置
PCT/JP1991/000948 WO1992001869A1 (fr) 1990-07-18 1991-07-16 Procede et unite de commande de vehicule pour operation de chargement

Publications (3)

Publication Number Publication Date
EP0539589A1 EP0539589A1 (fr) 1993-05-05
EP0539589A4 EP0539589A4 (fr) 1995-03-22
EP0539589B1 true EP0539589B1 (fr) 1997-01-02

Family

ID=16213642

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91912321A Expired - Lifetime EP0539589B1 (fr) 1990-07-18 1991-07-16 Procede et unite de commande de vehicule pour operation de chargement

Country Status (4)

Country Link
EP (1) EP0539589B1 (fr)
JP (1) JP2520771B2 (fr)
DE (1) DE69123971T2 (fr)
WO (1) WO1992001869A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130090835A1 (en) * 2010-05-20 2013-04-11 Komatsu Ltd. Construction machine

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3274541B2 (ja) * 1993-07-06 2002-04-15 株式会社日立製作所 浄水場管理支援方法及び支援システム
JPH09177679A (ja) * 1995-12-22 1997-07-11 Hitachi Constr Mach Co Ltd ポンプトルク制御装置
DE19644961A1 (de) * 1996-10-29 1998-04-30 Samsung Heavy Ind Verfahren zum Steuern des Motor-Pumpe-Systems einer hydraulischen Baumaschine
US6073442A (en) * 1998-04-23 2000-06-13 Caterpillar Inc. Apparatus and method for controlling a variable displacement pump
KR20000021949A (ko) * 1998-09-30 2000-04-25 토니헬샴 엔진 회전수 제어장치 및 방법
JP3561667B2 (ja) * 1999-11-18 2004-09-02 新キャタピラー三菱株式会社 油圧ポンプの制御装置
DE10314329A1 (de) * 2003-03-28 2004-10-21 Zf Friedrichshafen Ag Antriebsstrang zum Antrieb eines Mobil-Fahrzeugs
JP4163073B2 (ja) * 2003-08-12 2008-10-08 日立建機株式会社 作業車両の制御装置
JP4754969B2 (ja) * 2006-01-10 2011-08-24 株式会社小松製作所 作業車両のエンジン制御装置
US8578709B2 (en) 2006-05-10 2013-11-12 Sumitomo (S.H.I.) Construction Machinery Co., Ltd. Over-loading prevention device of construction machinery
US8718878B2 (en) * 2007-04-04 2014-05-06 Clark Equipment Company Power machine or vehicle with power management
JP4714721B2 (ja) * 2007-09-19 2011-06-29 日立建機株式会社 走行式油圧作業機
US9458603B2 (en) 2014-10-31 2016-10-04 Komatsu Ltd. Wheel loader and control method for wheel loader
FR3027971B1 (fr) * 2014-11-05 2016-11-11 Groupe Mecalac Dispositif de regulation de puissance d'une pompe hydraulique
JP6087382B2 (ja) * 2015-03-20 2017-03-01 株式会社小松製作所 ホイールローダおよびホイールローダの制御方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS585338B2 (ja) * 1975-04-14 1983-01-31 株式会社小松製作所 クツサクツミコミシヤリヨウ
KR910009257B1 (ko) * 1985-09-07 1991-11-07 히다찌 겡끼 가부시기가이샤 유압건설기계의 제어시스템
JP2724820B2 (ja) * 1986-12-18 1998-03-09 株式会社小松製作所 可変容量型油圧ポンプの制御装置
JP2587819B2 (ja) * 1986-12-27 1997-03-05 日立建機株式会社 建設機械の油圧制御装置
JP2511925B2 (ja) * 1987-01-30 1996-07-03 株式会社小松製作所 建設機械のエンジン回転数制御装置
JP2613041B2 (ja) * 1987-02-06 1997-05-21 株式会社小松製作所 油圧制御装置
JP2566401B2 (ja) * 1987-03-24 1996-12-25 株式会社小松製作所 ブルド−ザのエンジン出力制御方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130090835A1 (en) * 2010-05-20 2013-04-11 Komatsu Ltd. Construction machine

Also Published As

Publication number Publication date
EP0539589A4 (fr) 1995-03-22
EP0539589A1 (fr) 1993-05-05
WO1992001869A1 (fr) 1992-02-06
JP2520771B2 (ja) 1996-07-31
DE69123971D1 (de) 1997-02-13
JPH0476126A (ja) 1992-03-10
DE69123971T2 (de) 1997-04-30

Similar Documents

Publication Publication Date Title
EP0539589B1 (fr) Procede et unite de commande de vehicule pour operation de chargement
US4369625A (en) Drive system for construction machinery and method of controlling hydraulic circuit means thereof
EP0532756B1 (fr) Dispositif et procede de commande de vehicules effectuant des travaux de chargement
EP0287670B1 (fr) Dispositif de commande d'entrainement pour machines de construction hydrauliques
EP0041273B1 (fr) Système de commande de la pression de circuit pour une transmission hydraulique
EP2123947B1 (fr) Dispositif de commande de déplacement pour véhicule de déplacement hydraulique
EP1655469B1 (fr) Dispositif de commande d'un vehicule de chantier
EP0214633B1 (fr) Système de commande pour un engin de terrassement à entraînement hydraulique
EP0045664B1 (fr) Système de commande de la pression de circuit pour une transmission hydraulique
US7607296B2 (en) Device and method of controlling hydraulic drive of construction machinery
KR0178137B1 (ko) 유압식 구동장치의 변속장치 및 그 변속제어방법
US6582340B1 (en) Loading operation vehicle
WO2002021023A1 (fr) Regulateur de vitesse pour vehicule hydraulique sur roues
EP1790551A1 (fr) Dispositif d' entraînement hydraulique pour véhicule de travail
JPH07208404A (ja) 油圧式建設機械のエンジン−ポンプ制御装置及び制御方法
EP1207304A1 (fr) Procede et dispositif de commande de pompe
GB2355544A (en) Control unit for a construction machine
EP0471842B1 (fr) Unite de commande de pompe a capacite variable pour roue a entrainement hydraulique
JP3003958B2 (ja) ロードセンシング油圧回路
JP4127771B2 (ja) 建設機械のエンジン制御装置
EP1561866B1 (fr) Engin de travaux
EP0084835B1 (fr) Transmission
GB2045360A (en) Drive system for construction machinery
US6447423B1 (en) Method and apparatus for adjusting transmission ratio commands for a continuously variable transmission
EP0050318B1 (fr) Méthode et système de contrôle pour mécanismes hydrostatiques

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19930115

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE SE

A4 Supplementary search report drawn up and despatched
AK Designated contracting states

Kind code of ref document: A4

Designated state(s): DE SE

17Q First examination report despatched

Effective date: 19950831

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE SE

REF Corresponds to:

Ref document number: 69123971

Country of ref document: DE

Date of ref document: 19970213

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19970717

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980401

EUG Se: european patent has lapsed

Ref document number: 91912321.6