WO1994004809A1 - Self-diagnosing apparatus of vehicle - Google Patents
Self-diagnosing apparatus of vehicle Download PDFInfo
- Publication number
- WO1994004809A1 WO1994004809A1 PCT/JP1993/001026 JP9301026W WO9404809A1 WO 1994004809 A1 WO1994004809 A1 WO 1994004809A1 JP 9301026 W JP9301026 W JP 9301026W WO 9404809 A1 WO9404809 A1 WO 9404809A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- diagnostic data
- abnormality
- storage
- vehicle
- abnormality detection
- Prior art date
Links
- 238000001514 detection method Methods 0.000 claims abstract description 60
- 230000005856 abnormality Effects 0.000 claims description 103
- 238000004092 self-diagnosis Methods 0.000 claims description 21
- 238000013500 data storage Methods 0.000 claims description 12
- 238000003745 diagnosis Methods 0.000 claims description 10
- 230000002159 abnormal effect Effects 0.000 claims description 9
- 230000004044 response Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 7
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 239000000446 fuel Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000006870 function Effects 0.000 description 2
- 101100190462 Caenorhabditis elegans pid-1 gene Proteins 0.000 description 1
- 101100190464 Caenorhabditis elegans pid-2 gene Proteins 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
- F02D41/266—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor the computer being backed-up or assisted by another circuit, e.g. analogue
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
Definitions
- the present invention relates to a vehicle self-diagnosis device that stores and holds diagnosis data required for analyzing an abnormality of an on-vehicle device.
- the electronics of vehicles are remarkable, and the onboard equipment of each part of the vehicle, including the engine, is organically connected to each other by a control computer to perform complicated operations.
- Japanese Patent Application Laid-Open No. Sho 62-14242849 discloses that the diagnostic data of each part of the vehicle is updated and stored at regular intervals in a memory which retains the contents even when the ignition switch is turned off.
- a self-diagnosis device has been proposed that prohibits (freezes) the above-mentioned memory contents after detecting an abnormality in the on-board equipment so that the cause of the abnormality can be accurately grasped after getting off the vehicle.
- Japanese Patent Application Laid-Open No. 3-92564 proposes a device in which a control program is stored in a memory in addition to the above-mentioned diagnostic data, and an attempt is made to grasp the cause of the abnormality more accurately.
- the storage processing of the diagnostic data is executed by the arithmetic processing of the microcomputer, it takes a little time from abnormality detection to data freeze. This anomaly If the ignition switch is interrupted between the detection and the data freeze, the microcomputer stops the arithmetic processing, and the diagnostic data before the ignition switch was shut off is not data frozen, so the ignition switch is turned on again. Then, when the control program starts, the diagnostic data is reset initially, which makes it impossible to analyze abnormalities. In addition, even if an abnormality was first detected before the ignition switch was shut off, but the diagnostic data at the time of re-detection of the abnormality after the ignition switch was re-input, the first error was detected.
- a diagnostic data different from that at the time of occurrence (diagnosis data at the time of re-input of ignition switch) will be output, and it will be impossible to analyze the cause of the erroneous abnormality or to investigate the cause of the abnormality. There was a fear of becoming.
- the diagnostic data is stored and updated in the memory at regular intervals until the occurrence of an abnormality.However, this may be burdensome in view of the calculation speed of the CPU. It is conceivable that diagnostic data is memorized and frozen only after the occurrence is detected.
- An object of the present invention is to solve the above-described problems, and to enable accurate analysis of the cause of an abnormality even when the power is shut off immediately after the abnormality is detected.
- the fact that an abnormality has been detected is stored immediately after the abnormality is detected, and the fact that the power has been cut off between the abnormality detection processing and the subsequent processing of operating the diagnostic data indicates that the power supply has been restarted.
- the purpose is to prevent problems such as erasure of diagnostic data due to power-off, storage of incorrect diagnostic data, output of incorrect diagnostic data, or erroneous analysis due to incorrect diagnostic data. Disclosure of the invention
- diagnostic data detecting means for detecting diagnostic data necessary for analyzing an abnormality of an in-vehicle device mounted on a vehicle; Means, an abnormality detection history storing means for storing the abnormality detection history of the abnormality detection means, and holding the memory even when the ignition switch is off, and an abnormality of the in-vehicle device is detected by the abnormality detection means.
- Diagnostic data storage means for storing the diagnostic data detected by the diagnostic data detecting means and holding the memory even when the ignition switch is in the on state; and the abnormality detection history after the ignition switch is turned on.
- Update prohibition means for referring to the detection history stored in the storage means and prohibiting updating of the diagnostic data stored in the diagnostic data storage means when there is a detection history.
- the diagnostic data in the storage means will be lost due to the initial reset when the ignition switch is turned on next time.
- the abnormality detection history before the ignition switch is turned on is referred to, and if there is a detection history, the update of the diagnostic data is prohibited. Therefore, the diagnostic data will not be reset by mistake.
- the diagnosis data at the time of the previous abnormality detection is not reset erroneously at the initial stage of the power re-input.
- Means for detecting an abnormality of each device mounted on the vehicle, storage means for retaining the contents even when the ignition switch is turned off, and storage means for detecting the abnormality of the device when the device abnormality is detected In place A means for setting a diagnostic bit and then storing diagnostic data necessary for analyzing a device abnormality; and a means for resetting the flag bit after storing all diagnostic data. I have.
- the flag bit when an abnormality is detected, the flag bit is set prior to the storage of the diagnostic data. This flag bit is reset after all diagnostic data stores are completed. Therefore, if the power is shut off during the diagnostic data store, the flag bit will not be reset. Therefore, if the presence or absence of a flag bit is checked at the time of reading diagnostic data, erroneous diagnostic data will not be read.
- the self-diagnosis device of the present invention when the power is shut down during the storage of the diagnostic data, the self-diagnosis is determined based on the presence / absence of the flag bit, and an erroneous diagnosis is performed. Data reading can be reliably avoided.
- FIG. 1 is a diagram showing an overall configuration of a self-diagnosis device according to a first embodiment to which the present invention is applied.
- FIG. 2 is a configuration diagram of the control unit of the first embodiment.
- FIG. 3 is a program flow chart of the first embodiment.
- FIG. 4 is a program flowchart of the first embodiment.
- FIG. 5 is a diagram showing a memory configuration of the standby RAM according to the first embodiment.
- FIG. 6 is a program flow chart of the first embodiment.
- FIG. 7 is a program flow chart of the first embodiment.
- FIG. 8 is a program flow chart of the first embodiment.
- FIG. 9 is a block diagram showing the main functions of the first embodiment.
- FIG. 1 is a diagram showing an overall configuration of a self-diagnosis device according to a first embodiment to which the present invention is applied.
- FIG. 2 is a configuration diagram of the control unit of the first embodiment.
- FIG. 3 is a program flow chart of the first embodiment.
- FIG. 4
- FIG. 10 is a diagram showing the overall configuration of a self-diagnosis device according to a second embodiment to which the present invention is applied.
- FIG. 11 is a program flowchart of the second embodiment.
- FIG. 12 is a program flowchart of the second embodiment.
- FIG. 13 is a diagram showing a memory configuration of a standby RAM according to the second embodiment.
- FIG. 14 is a program flowchart of the second embodiment.
- Figure 15 shows the time of the second embodiment. It is a chart.
- FIG. 16 is a program flow chart of the second embodiment.
- FIG. 17 is a program flow chart of the second embodiment.
- FIG. 18 is a block diagram showing the main functions of the second embodiment. BEST MODE FOR CARRYING OUT THE INVENTION
- the temporary storage of the occurrence of the abnormality is performed immediately after the occurrence of the abnormality, and then the update of the diagnostic data sequentially updated and stored is prohibited.
- the update storage process of the diagnostic data is performed after the ignition switch is turned on.
- update storage is prohibited if temporary storage exists.
- the update storage is prohibited again after the ignition switch is turned on again, so that the diagnosis data at the time of occurrence of an abnormality can be saved and accurate analysis can be performed.
- a potentiometer 21 of a flow meter 31 an intake air temperature sensor 24, a throttle sensor 27 of a throttle valve 32, A fuel injection valve 29 is provided, a water temperature sensor 23 is provided in the engine E in the engine E, and a 02 sensor 22 is provided in the exhaust pipe E 2 of the engine E.
- a control unit 1 with a built-in CPU 101 is provided.
- the CPU 101 uses a data bus to control the RAM 102, R0M103 for storing control programs, the oscillator circuit 104, and the input / output ports. Connected to 105 A, 105 B and output boards 106 A, 106 B, 106 C.
- the RAM I 102 is divided into a normal RAM for temporary storage and a standby RAM that retains its contents even when the ignition key is shut off.
- the output signals of the temperature sensor 24 and the throttle sensor 27 are input to the input / output port 105A via the multiplexer 107 and the AZD converter 108.
- Output signals of the cylinder discrimination sensor 25 and the rotation angle sensor 26 are input to the input / output port 105B through the waveform shaping circuit 109.
- Output signals are given to the ignition 28 and the fuel injection valve 29 via the output ports 106B, 106C and the drive circuits 112B, 112C.
- an output signal is issued to the abnormality warning means 5 through the output port 106A and the drive circuit 112A.
- diagnostic data required for analyzing the device abnormality is exchanged between the failure diagnostic device 4 via the input / output port 105B and the intercommunication circuit 110.
- FIG. 3 is a program for detecting an abnormality of the throttle sensor 27.
- S101 it is checked whether the throttle opening signal is in the range of 0.4V to 4.9V (S101, S102), and if it is in this range, the fail counter is cleared and Normally, the fail flag in R A1V [is cleared (S105, S106). On the other hand, if the time outside the above range exceeds 500 ms (S103), a fail flag is set as a throttle sensor error (S104).
- Figure 4 shows a program that sets the fail flag to the standby RAM when it is set, and starts every 65 ms.
- S201 it is checked whether the data can be written to the standby RA [. If the fail flag is set, a predetermined bit of the standby RAM is set (S202, S203), and Note that a specific device error has been detected.
- the memory configuration of the standby RAM is shown in Fig. 5, where diagnostic data such as engine speed and engine water temperature are sequentially stored in each address in the frame. You. An error code indicating the type of error is set in the first address as described below.
- Figure 6 shows a program that controls writing to standby RAM.
- the program starts every 65 ms, and in S301, checks whether an error code is set.If not, the diagnostic data stored in the previous cycle is replaced with the newly input diagnostic data. (S302). In this state, if the file flag is set in a predetermined bit of the standby RAM, the above error code is set as an error is detected (S303, S30'4). . If an error code is set in S301, updating is prohibited and diagnostic data is frozen.
- Figure 7 shows an initial program that is executed only once when the ignition switch is turned on.
- the normal RAM is initialized (S401)
- Fig. 8 shows a program for connecting a failure diagnosis device after dismounting and transmitting diagnostic data.
- the program starts every 16 ms.
- S501 it is checked whether a request for the freed diagnostic data has been received from the diagnostic device, and diagnostic data corresponding to the requested PID is selected (S502).
- the requested PID is a request for diagnostic data in an ID format from the diagnostic device. For example, PID 1 Is the engine speed, and PID 2 is the vehicle speed.
- the selected diagnostic data is transmitted to the diagnostic device (S503).
- a fail flag is first set in response to the abnormality detection, and thereafter, the data is updated and recorded, and the abnormality code is stored. Then, the next time the ignition switch is turned on, the presence or absence of the file flag is determined, so that it is determined that an abnormality has occurred during the previous ignition switch being turned on, and the update storage of the data is prohibited.
- the operation is described only when an abnormality occurs in the throttle sensor.
- various abnormalities can be detected as in-vehicle device abnormalities. It can be performed in combination with detection.
- old data may be deleted before new data is stored, and new data may be stored. If the ignition switch is interrupted during data update after an error occurs and data update is terminated halfway, However, only the data immediately after the occurrence of the abnormality can be stored.
- the method of updating and storing the data is not limited to the method of updating and storing at predetermined intervals, and may be updated and stored only when an abnormality is detected.
- a temporary storage process for the occurrence of an abnormality is performed immediately after the occurrence of the abnormality, and a plurality of diagnostic data are sequentially stored thereafter.
- the presence of the temporary memory can be used to confirm that the power is cut off by the ignition switch and the operation of storing diagnostic data has not been completed.
- the temporary storage exists, the output of the diagnostic data is prohibited to prevent erroneous analysis.
- FIG. 10 shows the overall configuration of the self-diagnosis device.
- the control unit 51 is composed of CPU 61, RO 62, RAM 63, input / output (1-0) circuit 64, comparator 65, and the like.
- the CPU 61, the RAM 62, the RAM 63, and the IZ0 circuit 64 are supplied with power from a battery 53 via an ignition switch 52.
- a portion of the RAM 63 is directly supplied with power from the battery 53, and serves as a standby RAM that retains its stored contents even when the ignition switch 52 is shut off.
- the battery voltage is input to the comparator 65 and compared with the reference voltage, which is input to the latch port of the I / O circuit 64.
- the comparator 65 outputs a "1" level output, and the voltage drop latch in the IZO circuit 64 is set.
- the IZO circuit 64 receives sensor signals from sensors provided in each part of the vehicle, such as a throttle sensor 71, air flow meter 72, crank angle sensor 73, and water temperature sensor 74.
- the CPU 61 calculates the fuel injection amount according to the control program in the R ⁇ M 62 by the signal. Then, an output signal corresponding to the fuel injection amount is transmitted to the fuel injection valve 75 through the IZO circuit 64.
- Each of these sensor signals is frozen when an abnormality is detected as a diagnostic data.
- Fig. 11 shows an example of a throttle sensor abnormality detection program. Steps (hereinafter referred to as S) In steps 1 51 and S 152, check that the throttle opening signal is in the range of 0.4 to 4.9 V. If it is in this range, clear the fail counter and Then, the file flag in the RAM 63 is cleared (S155, S156). On the other hand, if the time outside the above range exceeds 50 Oms (S153), a fail flag is set as a throttle sensor abnormality (S154).
- FIG. 12 shows a program for setting the file flag in the standby RAM when the file flag is set, and is activated every 65 ms.
- S251 it is checked whether writing to the standby RAM is possible. If the file flag is set, the predetermined bit of the standby RAIV [is set (S252, S253) ⁇ that a specific device abnormality has been detected.
- Figure 13 shows the memory configuration of the standby RAM. Multiple storage frames are reserved in the standby RAM (one of them is shown in the figure), and a flag bit is added to the first address of each frame along with the error code determined according to the type of error. Set. Then, diagnostic data such as engine speed (NE) and vehicle speed (SPD) useful for analysis of the abnormality are sequentially stored in the subsequent addresses. Each diagnostic data is stored as 8 bits or 16 bits.
- NE engine speed
- SPD vehicle speed
- Figure 14 shows a program that controls the writing of diagnostic data to the standby RAM.
- the program starts every 65 ms, and checks whether an abnormal code is set in S351. If no error code is set, the specified bit of the standby RAM is set and it is checked whether an error has been detected (S352). If an error is detected, the process proceeds to S355 or lower. In S353, the flag bit (Fig. 13) is set to the above-mentioned head address, and then the voltage drop latch in the IZO circuit 64 is cleared (S354). o
- an abnormal code is set, and then diagnostic data such as the engine speed (NE) and the vehicle speed (SPD) are sequentially stored (S356, S357).
- diagnostic data such as the engine speed (NE) and the vehicle speed (SPD) are sequentially stored (S356, S357).
- Fig. 15 (2) shows the case where the ignition switch is interrupted during the storage of the diagnostic data. Since the program is not executed after the power is turned off, the flag bit remains set.
- Fig. 15 (3) shows the case where the power supply voltage temporarily drops during the storage of the diagnostic data, and the voltage drop latch is set when the voltage drops, so that S359 is not executed and the flag bit is not executed. Remains set o
- FIG. 16 shows a program that outputs diagnostic data from the control unit 51 to the diagnostic checker 54 connected to the I0 circuit 64.
- S451 check whether there is a data output request from the diagnostic checker. If there is a request, confirm that the above flag bit is not set in the storage frame to be output in S452, and check the diagnostic data that has been fused with the abnormal code. Read (S455, S445). This is performed for all the storage frames, and the output is terminated (S455). If the flag bit is set, the diagnostic data of the frame is not output, so the data from the frame in which the wrong data is stored due to the interruption of the ignition switch or the voltage drop during the data store. Output is prevented.
- Fig. 16 shows the control unit to prevent erroneous data output.
- An example is shown in which the processing is incorporated in the diagnostic data output processing on the unit 51 side.However, as shown in Fig. 17, the diagnostic checker 15 is frozen on the control unit 51 side by the diagnostic circuit 54 side. The data may be read out after judging whether or not the stored data is incorrect.
- a data request is output to the CPU of the control unit in S551, and the flag bit is read in S552.
- control unit 51 does not perform the output processing as shown in FIG. 16, but outputs a flag, a diag code, and a flag in response to a request from the diagnostic checker. Only the release data is sequentially output.
- the detection of the voltage drop is not necessarily required.
- the presence / absence of the setting of the abnormal code is determined in step S402 of FIG. 7, and the presence / absence of the fail flag is determined only when there is no setting. It is also possible to eliminate the determination of 02 and determine only whether the fail flag has been set, and if the fail flag has been set, set the error code corresponding to the oldest fail flag. Good. In this case as well, the data at the time of the occurrence of the abnormality during the previous trip can be held as in the first embodiment. Note that in order to set and save the error code corresponding to the oldest fail flag, it is necessary to store the order of occurrence for each fail flag, or to use only one fail flag according to the number of fail flags. An error code corresponding to the fail flag is set, and when there are two or more error codes, the current error code is retained.
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/211,604 US5506773A (en) | 1992-08-11 | 1993-07-22 | Self-diagnosing apparatus for motor vehicles |
DE69315190T DE69315190T2 (de) | 1992-08-11 | 1993-07-22 | Selbstdiagnosegerät eines fahrzeugs |
EP93916209A EP0607455B1 (en) | 1992-08-11 | 1993-07-22 | Self-diagnosing apparatus of vehicle |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23534892A JP3149558B2 (ja) | 1992-08-11 | 1992-08-11 | 車両の自己診断装置 |
JP4/235348 | 1992-08-11 | ||
JP4/250694 | 1992-08-26 | ||
JP25069492A JPH0674085A (ja) | 1992-08-26 | 1992-08-26 | 車両の自己診断装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994004809A1 true WO1994004809A1 (en) | 1994-03-03 |
Family
ID=26532062
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1993/001026 WO1994004809A1 (en) | 1992-08-11 | 1993-07-22 | Self-diagnosing apparatus of vehicle |
Country Status (4)
Country | Link |
---|---|
US (1) | US5506773A (ja) |
EP (1) | EP0607455B1 (ja) |
DE (1) | DE69315190T2 (ja) |
WO (1) | WO1994004809A1 (ja) |
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JP5348040B2 (ja) * | 2010-03-25 | 2013-11-20 | 株式会社デンソー | 車両通信システム及び電子制御装置 |
JP6435880B2 (ja) * | 2015-01-23 | 2018-12-12 | 株式会社デンソー | 電子制御装置 |
US9723692B2 (en) | 2015-05-20 | 2017-08-01 | Saf-Holland, Inc | Fifth wheel coupling detection system with inspection and indication lighting arrangement |
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JPS62142849A (ja) * | 1985-12-17 | 1987-06-26 | Japan Electronic Control Syst Co Ltd | 車載電子制御装置の自己診断装置 |
JPS6390738A (ja) * | 1986-10-03 | 1988-04-21 | Fuji Heavy Ind Ltd | 電子制御装置 |
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US4307455A (en) * | 1978-02-27 | 1981-12-22 | Rockwell International Corporation | Power supply for computing means with data protected shut-down |
JPH0619666B2 (ja) * | 1983-06-30 | 1994-03-16 | 富士通株式会社 | 故障診断処理方式 |
GB8813066D0 (en) * | 1988-06-02 | 1988-07-06 | Pi Research Ltd | Vehicle data recording system |
JPH0392564A (ja) * | 1989-09-06 | 1991-04-17 | Japan Electron Control Syst Co Ltd | 車両の制御記録装置 |
JPH03262099A (ja) * | 1990-03-13 | 1991-11-21 | Oki Electric Ind Co Ltd | 異常検出システム |
JP2805970B2 (ja) * | 1990-04-06 | 1998-09-30 | 株式会社デンソー | 車両用電子制御装置 |
US5191529A (en) * | 1990-10-01 | 1993-03-02 | Rockwell International Corporation | Trip recorder operation and memory retention extension through multiple battery backup and a load shedding strategy triggered by a primary power interruption |
JPH0674086A (ja) * | 1992-08-27 | 1994-03-15 | Nippondenso Co Ltd | 車両の自己診断装置 |
-
1993
- 1993-07-22 DE DE69315190T patent/DE69315190T2/de not_active Expired - Lifetime
- 1993-07-22 WO PCT/JP1993/001026 patent/WO1994004809A1/ja active IP Right Grant
- 1993-07-22 US US08/211,604 patent/US5506773A/en not_active Expired - Lifetime
- 1993-07-22 EP EP93916209A patent/EP0607455B1/en not_active Expired - Lifetime
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JPS62142849A (ja) * | 1985-12-17 | 1987-06-26 | Japan Electronic Control Syst Co Ltd | 車載電子制御装置の自己診断装置 |
JPS6390738A (ja) * | 1986-10-03 | 1988-04-21 | Fuji Heavy Ind Ltd | 電子制御装置 |
Cited By (1)
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US6694483B1 (en) * | 1999-04-13 | 2004-02-17 | Komatsu Ltd. | System for backing up vehicle use data locally on a construction vehicle |
Also Published As
Publication number | Publication date |
---|---|
DE69315190T2 (de) | 1998-03-19 |
DE69315190D1 (de) | 1997-12-18 |
US5506773A (en) | 1996-04-09 |
EP0607455B1 (en) | 1997-11-12 |
EP0607455A1 (en) | 1994-07-27 |
EP0607455A4 (en) | 1994-12-07 |
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