EP0470960A1 - Process and device for checking the controllability of a tank ventilation valve. - Google Patents
Process and device for checking the controllability of a tank ventilation valve.Info
- Publication number
- EP0470960A1 EP0470960A1 EP19900903764 EP90903764A EP0470960A1 EP 0470960 A1 EP0470960 A1 EP 0470960A1 EP 19900903764 EP19900903764 EP 19900903764 EP 90903764 A EP90903764 A EP 90903764A EP 0470960 A1 EP0470960 A1 EP 0470960A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tank ventilation
- ventilation valve
- diagnostic method
- inlet
- outlet line
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/0809—Judging failure of purge control system
Definitions
- the invention is based on a diagnostic method according to the preamble of the main claim.
- a diagnostic method is already known (DE-PS 36 24 441), in which the controllability of a tank ventilation valve and an idle actuator is checked.
- the tank ventilation valve is arranged in a feed line that connects an intermediate container, which receives fuel vapors from a fuel tank, to the intake area of an internal combustion engine.
- the intermediate container usually contains an activated carbon filter, which only allows a certain maximum degree of loading, i. H. can only absorb a maximum amount of fuel in the form of fuel vapors.
- the method according to the invention with the characterizing features of the main claim has the advantage that it works regardless of how much the amount of additional air that can be supplied via the tank ventilation valve is enriched with fuel. That is, that Diagnostic procedures can be used at any time, even if the activated carbon filter and therefore the additional air that can be supplied is heavily loaded with fuel.
- variables are used for the diagnostic method that change when an air / fuel mixture flows through the tank ventilation valve and can be measured in the area of the tank ventilation valve by sensors intended for this purpose, it is not necessary to evaluate reactions of the internal combustion engine or one of its control devices. This means that their functionality is not a prerequisite for the diagnostic method according to the invention.
- Figure 1a highly schematic in the form of a block diagram, a possible form of implementation of electronic, electrical and electromechanical regulation and control elements and actuators for the operation of an internal combustion engine, in particular the area of the tank ventilation is indicated with sensors necessary for first embodiments of the diagnostic method.
- FIG. 1b an enlarged representation of the tank ventilation valve with its inlet and outlet line, as well as a differential pressure sensor necessary for one embodiment
- FIG. 2 the flow chart of the diagnostic procedure with pressure measurement
- Figure 3 the flow chart of the diagnostic method with mass flow rate measurement
- Figure 4 the flow chart of the diagnostic procedure with differential pressure measurement.
- the basic idea of the present invention is to carry out an actuator diagnosis for the area of the tank ventilation in the operation of a motor vehicle and with the engine running, in which a real physical reaction results, regardless of that
- Air / fuel ratio of the regeneration gas flow of the activated carbon filter is based on the fact that actuation of the tank ventilation valve directs an additional air quantity through the activated carbon filter to the intake area of the internal combustion engine and that the flow of this air quantity changes quantities that are registered by sensors upstream and downstream of the tank ventilation valve. Corresponding error states can then be identified in this way.
- FIG. 1 which is based on discrete switching stages, does not limit the invention, but serves in particular to illustrate the functional basic effects of the invention and special functional sequences in one possible way Specify the form of implementation. It is understood that the individual blocks and blocks can be constructed using analog, digital or hybrid technology.
- an internal combustion engine is designated 10 and its intake area 11), in which a throttle valve 11a is rotatably arranged. A deflection from the rest position is indicated by the angle ⁇ .
- the other components that ensure the operation of the internal combustion engine are only dealt with to the extent necessary for understanding the present invention and for the basic relationships.
- An electronic control unit 12 which is usually a microcomputer with a microprocessor, associated memory, power supply and peripheral sensors and actuators, receives multiple operating status data, at least with respect to the load L of the internal combustion engine 10 from an air flow meter 13, which can be a baffle plate, a pressure meter, a hot wire sensor or the like,
- the air / fuel ratio supplied to the internal combustion engine which is determined by the output signal of a lambda sensor 15, which is arranged in the exhaust gas duct 16, and an actual value indication of the respective operating state of the internal combustion engine, more precisely the oxygen content in the exhaust gas.
- the electronic control unit 12 From this data and a large number of additional information such as temperature, air pressure and the like, the electronic control unit 12 generates an output signal calculated with high accuracy, for example in an injection system for a fuel injection system an injection control command ti for actuating injection valves symbolically represented by 17 in the intake area.
- a control unit 18 which is drawn separately for reasons of clarity, is also provided for the tank ventilation, but can also be part of the central microcomputer and which controls the tank ventilation valve 19. This is arranged in a line which leads from an intermediate container 20, which receives vapors from a fuel tank 21, to the intake area 11 of the internal combustion engine at point 22.
- a diagnostic block 23 is also provided, which is shown separately in FIG. 1, but can also be part of the central microcomputer.
- This diagnostic block emits a signal via a signal line to the tank ventilation control unit 18, by means of which the usual tank ventilation function is switched off and the diagnostic method is initiated.
- the diagnostic block receives signals the speed sensor 14 with respect to the speed n,
- a sensor 25 which is arranged in the outlet line of the tank ventilation valve 19.
- the sensors 24 and 25 are designed such that they detect quantities that change when an air / fuel mixture flows through the tank ventilation valve 19.
- the diagnostic block 23 can also receive a signal from the electronic control unit 12, which only allows the diagnostic method to be carried out.
- a signal relating to the load L can also be supplied to the diagnostic block 23 by the air flow meter 13, in particular if the latter is designed as a pressure meter.
- the diagnostic block 23 also as part of the microcomputer or its programming, comprises memories in which the measured values of the sensors 24 and 25 and results of the diagnosis can be stored, and comparison means which can carry out the necessary comparisons of the measurement signals.
- a display device 26 can also be actuated by the diagnostic block 23, which, depending on the result of the diagnosis, lights up indicator lamps, for example. It goes without saying that this display can in principle be implemented in any form, including as a letter display, and can also display intermediate values of the diagnosis.
- a negative pressure is generated in the intake area 11, ie a pressure pA that is less than Is atmospheric pressure and which depends on operating parameters, such as the speed n and the deflection ⁇ of the throttle valve 11a.
- the sensors 24 and 25 are designed such that they measure the pressure in the inlet and outlet line of the tank ventilation valve 19. The sequence of the diagnostic procedure is explained with the aid of FIG. 2.
- step 100 such operating parameters are measured on which the pressure in the intake area 11 depends (step 100), such as the rotational speed n and the angle of attack ⁇ of the throttle valve 11a.
- the pressure pA in the intake area 11 of the internal combustion engine 10 is calculated in step 101.
- Step 100 can also be designed such that the pressure pA in the suction area 11 is detected by a sensor provided for this purpose; the signal it emits can also be used as a measure of the load state of the internal combustion engine.
- step 102 pA is compared with a maximum permissible pressure pAMAX, which is at most permissible in order to be able to measure a pressure change after activation of the tank ventilation valve 19 by the sensors 24 and 25. If pA is greater than pAMAX, the diagnostic procedure is aborted (103). If, however, pA is less than or equal to pAMAX, the pressures p124 and p125 are measured in step 104 by the sensors 24 and 25, respectively. These values are stored in step 105, and then a control signal AS is sent by the diagnostic block 23 to the tank ventilation control unit 18 submitted (106). In step 107, pressures p224 and p225 are measured again by sensors 24 and 25, respectively.
- pAMAX a maximum permissible pressure pAMAX
- step 108 the actual evaluation is carried out by forming difference values, especially by
- step 109 the pressure differences from at least one of the equations (1) to (3) are compared with target values. If one or more of these differences are smaller than the associated target values DMIN, an error state is determined in step 111. A multitude of minimum values with respect to equations (1) - (3) are thus designated here by DMIN.
- tank ventilation valve 19 can be activated (110), which can be referred to here as a “good condition”.
- the results of the diagnosis (103, 110, 111) can be stored in the memory provided for this purpose, which is part of the diagnosis block 23 and / or can be displayed by the display device 26.
- the sensors 24, 25 are designed such that they measure a mass flow rate Q, usually of an air / fuel mixture, flowing through the inlet or outlet line of the tank ventilation valve.
- Q mass flow rate
- sensors 24 and 25 measure the mass flow in the inlet and outlet line of the tank ventilation valve 19 and store the associated values Q124 and Q125 (Step 204).
- step 109a If the query at step 109a shows that differences are greater than or equal to DMIN, this means that the tank ventilation valve can be actuated, but the tank ventilation system is leaking. This leak means that the air / fuel mixture gets outside the tank ventilation system or that the tank ventilation valve was not completely closed before actuation.
- a precise diagnosis which will not be discussed further, can also result in a selective evaluation of the output signals of the sensors 24, 25 in step 210.
- step 109 the question is asked in step 109 as to whether differences from equations (4) and (5) are smaller than the minimum target values DMIN. If "yes", the tank ventilation valve cannot be activated and is closed before and after activation by the diagnostic block 23 (111).
- step 109 If the query at step 109 is "no", this means that the tank ventilation system is tight in the area which the sensors 24, 25 detect and that the tank ventilation valve can be activated. This means that according to this variant of the diagnostic method, a "good condition" is inferred.
- DMIN denotes minimum values with respect to equations (4) and (5).
- the possible results of the diagnostic method (103, 110, 111, 210, 211) can be stored in the memory provided for this purpose, which is part of the diagnostic block 23 and / or can be displayed by the display device (26).
- a possible variation of the second embodiment which will not be discussed further, uses sensors 24, 25 in such a way that volume flows are measured instead of mass flows.
- a third version of the diagnostic method uses a single 27 (FIG. 1b) instead of the two sensors 24, 25, which outputs an output signal to the diagnostic block 23, which is a measure of the differential pressure between the outlet and the feed line of the tank ventilation valve 19.
- the sequence this version of the diagnostic method is explained with the aid of FIG. 4. Steps which proceed as in the first version of the diagnostic method are designated as in FIG. 2. These are only dealt with to the extent necessary for understanding.
- a pressure pA that is less than or equal to PMAX was determined in step 102
- a measurement of the differential pressure p127 between the discharge and the supply line of the tank ventilation valve 19 follows in step 304.
- the value of this measurement is stored in step 305 and then (106 ) a control signal AS for the tank ventilation valve is emitted to the tank ventilation control unit 18 by the diagnostic block 23.
- step 307 the differential pressure is measured again, which gives the value p227.
- step 108 differences, in particular, are calculated
- the diagnostic method concludes that there is a fault in the control chain of the tank ventilation valve (111), otherwise (“no") the tank ventilation valve has responded to the control signal and a "good condition” is registered (110).
- the results from 110 or 111 can then be displayed and / or saved.
- the essence of the diagnostic method according to the invention is that the controllability of a tank ventilation valve is checked by measuring the sizes in the area of the tank ventilation valve which change when a flow rate flows through the tank ventilation valve. Differences between these variables are preferably evaluated before and after actuation of the tank ventilation valve. If required, for example if the sensitivity of the sensors used requires it, the performance of the check can be made dependent on the pressure in the intake area of the internal combustion engine.
- the method according to the invention has the particular advantage that it works independently of engine reactions and therefore does not require any restriction of the air / fuel ratio of the flow rate.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
- Testing Of Engines (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Un procédé permet de contrôler la manoeuvrabilité d'une soupape d'aération d'un réservoir à travers laquelle une quantité supplémentaire d'air chargé de vapeurs de carburant peut être introduite dans la zone d'aspiration d'un moteur à combustion interne. Afin de mettre en oeuvre ce procédé, on mesure, dans la zone de la soupape d'aération du réservoir, des valeurs qui varient lorsqu'un certain débit s'écoule à travers celle-ci. On évalue de préférence des différences entre ces valeurs avant et après la commande de la soupape d'aération du réservoir. En cas de besoin, par exemple lorsque la sensibilité des capteurs utilisés le requiert, le contrôle peut dépendre de la pression dans la zone d'aspiration.A method for controlling the maneuverability of a tank vent valve through which an additional amount of fuel vapor laden air can be introduced into the suction area of an internal combustion engine. In order to implement this method, values are measured in the zone of the aeration valve of the tank, which vary when a certain flow rate flows through it. Differences between these values are preferably assessed before and after the control of the tank vent valve. If necessary, for example when the sensitivity of the sensors used so requires, the control can depend on the pressure in the suction zone.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3909887 | 1989-03-25 | ||
DE3909887A DE3909887A1 (en) | 1989-03-25 | 1989-03-25 | METHOD AND DEVICE FOR CHECKING THE CONTROLLABILITY OF A TANK BLEEDING VALVE |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0470960A1 true EP0470960A1 (en) | 1992-02-19 |
EP0470960B1 EP0470960B1 (en) | 1994-01-19 |
Family
ID=6377220
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90903764A Expired - Lifetime EP0470960B1 (en) | 1989-03-25 | 1990-02-27 | Process and device for checking the controllability of a tank ventilation valve |
Country Status (8)
Country | Link |
---|---|
US (1) | US5182945A (en) |
EP (1) | EP0470960B1 (en) |
JP (1) | JP2866477B2 (en) |
KR (1) | KR0137011B1 (en) |
BR (1) | BR9007250A (en) |
DE (2) | DE3909887A1 (en) |
ES (1) | ES2049467T3 (en) |
WO (1) | WO1990011443A1 (en) |
Families Citing this family (36)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2037920T3 (en) * | 1989-07-31 | 1993-07-01 | Siemens Aktiengesellschaft | PROVISION AND PROCEDURE FOR THE RECOGNITION OF DEFECTS IN A DEPOSIT VENTILATION SYSTEM. |
DE4035158C1 (en) * | 1990-11-06 | 1992-01-09 | Fa. Carl Freudenberg, 6940 Weinheim, De | |
DE4100659C1 (en) * | 1991-01-11 | 1992-05-14 | Fa. Carl Freudenberg, 6940 Weinheim, De | |
FR2674192B1 (en) * | 1991-03-21 | 1993-07-23 | Siemens Automotive Sa | METHOD AND DEVICE FOR VERIFYING THE OPERATING STATE OF A VAPOR RECOVERY SYSTEM FROM THE FUEL TANK OF A MOTOR VEHICLE. |
GB2254318B (en) * | 1991-04-02 | 1995-08-09 | Nippon Denso Co | Abnormality detecting apparatus for use in fuel transpiration preventing system |
DE4111360A1 (en) * | 1991-04-09 | 1992-10-15 | Bosch Gmbh Robert | METHOD AND DEVICE FOR TESTING A TANK VENTILATION SYSTEM |
DE4139946C1 (en) * | 1991-12-04 | 1993-02-04 | Fa. Carl Freudenberg, 6940 Weinheim, De | |
US5295472A (en) * | 1992-01-06 | 1994-03-22 | Toyota Jidosha Kabushiki Kaisha | Apparatus for detecting malfunction in evaporated fuel purge system used in internal combustion engine |
US5315980A (en) * | 1992-01-17 | 1994-05-31 | Toyota Jidosha Kabushiki Kaisha | Malfunction detection apparatus for detecting malfunction in evaporative fuel purge system |
JP2688674B2 (en) * | 1992-01-20 | 1997-12-10 | 本田技研工業株式会社 | Failure detection device and failure compensation device for fuel tank internal pressure sensor |
JP2688675B2 (en) * | 1992-01-20 | 1997-12-10 | 本田技研工業株式会社 | Fuel tank internal pressure detection device for internal combustion engine |
US5425344A (en) * | 1992-01-21 | 1995-06-20 | Toyota Jidosha Kabushiki Kaisha | Diagnostic apparatus for evaporative fuel purge system |
DE4239382A1 (en) * | 1992-11-24 | 1994-05-26 | Bosch Gmbh Robert | Method and device for avoiding false messages in the diagnosis of a tank ventilation valve in an internal combustion engine |
US5408866A (en) * | 1992-11-25 | 1995-04-25 | Nissan Motor Co., Ltd. | Leak diagnosis system for evaporative emission control system |
US5383437A (en) * | 1992-12-23 | 1995-01-24 | Siemens Automotive Limited | Integrity confirmation of evaporative emission control system against leakage |
JP3092376B2 (en) * | 1993-02-26 | 2000-09-25 | トヨタ自動車株式会社 | Failure diagnosis device for evaporation purge system |
DE4311314C1 (en) * | 1993-04-06 | 1994-03-31 | Freudenberg Carl Fa | Device for storage and feed of volatile fuel components into IC engine - has return valve with flow intake and outlets, with one elastomeric seal actuated by differential pressure |
US5495749A (en) * | 1993-05-14 | 1996-03-05 | Chrysler Corporation | Leak detection assembly |
US5386812A (en) * | 1993-10-20 | 1995-02-07 | Ford Motor Company | Method and system for monitoring evaporative purge flow |
DE4418010B4 (en) * | 1994-05-21 | 2007-06-28 | Robert Bosch Gmbh | Method for avoiding false alarms in the diagnosis of actuators, in particular flow valves in motor vehicles |
DE4427688C2 (en) * | 1994-08-04 | 1998-07-23 | Siemens Ag | Method for checking the functionality of a tank ventilation system for a motor vehicle |
US5606121A (en) * | 1996-03-05 | 1997-02-25 | Chrysler Corporation | Method of testing an evaporative emission control system |
US5651350A (en) * | 1996-03-05 | 1997-07-29 | Chrysler Corporation | Method of leak detection for an evaporative emission control system |
US5616836A (en) * | 1996-03-05 | 1997-04-01 | Chrysler Corporation | Method of pinched line detection for an evaporative emission control system |
US5641899A (en) * | 1996-03-05 | 1997-06-24 | Chrysler Corporation | Method of checking for purge flow in an evaporative emission control system |
US5682869A (en) * | 1996-04-29 | 1997-11-04 | Chrysler Corporation | Method of controlling a vapor storage canister for a purge control system |
DE19727297C2 (en) * | 1997-06-27 | 2003-11-13 | Bosch Gmbh Robert | Method for operating an internal combustion engine, in particular a motor vehicle |
DE19910486A1 (en) * | 1999-03-10 | 2000-09-14 | Bielomatik Leuze & Co | Device and method for checking the flow of a container connection |
DE10008189C2 (en) * | 2000-02-23 | 2002-02-14 | Bayerische Motoren Werke Ag | Device and method for checking a tank ventilation system |
EP1272755B1 (en) | 2000-04-06 | 2006-12-27 | Robert Bosch Gmbh | Method for conducting a leak test of a tank ventilation system of a vehicle |
DE10019935A1 (en) * | 2000-04-06 | 2001-10-25 | Bosch Gmbh Robert | Method for conducting a leak test in a vehicle's fuel tank ventilation system uses a source of pressure over a predetermined time interval to introduce over- and under pressure alternately into this ventilation system. |
DE10136183A1 (en) * | 2001-07-25 | 2003-02-20 | Bosch Gmbh Robert | Method for testing the operability of a motor vehicle fuel tank ventilation valve operates a control unit with a suction pipe connection |
DE10320054A1 (en) * | 2003-05-06 | 2004-11-25 | Robert Bosch Gmbh | Method and device for operating an internal combustion engine |
ES2402642B1 (en) * | 2011-10-26 | 2014-05-20 | Siempre En Bici, S.L. | MOTOR SYSTEM FOR BICYCLES, TRICYCLES AND PEDAL TRACTION VEHICLES |
JP5783392B2 (en) * | 2013-08-28 | 2015-09-24 | 三菱自動車工業株式会社 | Fuel tank system |
US10138846B1 (en) * | 2017-10-02 | 2018-11-27 | Ford Global Technologies, Llc | Systems and methods for an evaporative emissions system and fuel system having a single delta pressure sensor |
Family Cites Families (7)
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JPS54106410U (en) * | 1978-01-12 | 1979-07-26 | ||
DE3238190C2 (en) * | 1982-10-15 | 1996-02-22 | Bosch Gmbh Robert | Electronic system for controlling or regulating operating parameters of an internal combustion engine |
US4677956A (en) * | 1985-07-19 | 1987-07-07 | Ford Motor Company | Solenoid duty cycle modulation for dynamic control of refueling vapor purge transient flow |
US4641623A (en) * | 1985-07-29 | 1987-02-10 | Ford Motor Company | Adaptive feedforward air/fuel ratio control for vapor recovery purge system |
DE3624441A1 (en) * | 1986-07-19 | 1988-01-28 | Bosch Gmbh Robert | Diagnostic method for quantitative testing of actuators in internal-combustion engines |
DE3639946C2 (en) * | 1986-11-22 | 1997-01-09 | Bosch Gmbh Robert | Method and device for compensating for the tank ventilation error in an adaptively learning fuel supply system |
US4748959A (en) * | 1987-05-04 | 1988-06-07 | Ford Motor Company | Regulation of engine parameters in response to vapor recovery purge systems |
-
1989
- 1989-03-25 DE DE3909887A patent/DE3909887A1/en not_active Withdrawn
-
1990
- 1990-02-27 ES ES90903764T patent/ES2049467T3/en not_active Expired - Lifetime
- 1990-02-27 WO PCT/DE1990/000134 patent/WO1990011443A1/en active IP Right Grant
- 1990-02-27 JP JP2503875A patent/JP2866477B2/en not_active Expired - Lifetime
- 1990-02-27 DE DE90903764T patent/DE59004357D1/en not_active Expired - Fee Related
- 1990-02-27 US US07/762,000 patent/US5182945A/en not_active Expired - Lifetime
- 1990-02-27 BR BR909007250A patent/BR9007250A/en not_active IP Right Cessation
- 1990-02-27 EP EP90903764A patent/EP0470960B1/en not_active Expired - Lifetime
-
1991
- 1991-09-24 KR KR91701177A patent/KR0137011B1/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9011443A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE3909887A1 (en) | 1990-09-27 |
WO1990011443A1 (en) | 1990-10-04 |
JP2866477B2 (en) | 1999-03-08 |
DE59004357D1 (en) | 1994-03-03 |
KR0137011B1 (en) | 1998-04-25 |
JPH04503844A (en) | 1992-07-09 |
KR920701650A (en) | 1992-08-12 |
ES2049467T3 (en) | 1994-04-16 |
US5182945A (en) | 1993-02-02 |
BR9007250A (en) | 1991-11-26 |
EP0470960B1 (en) | 1994-01-19 |
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