EP0225971B1 - Diagnosesystem für ein Kraftfahrzeug - Google Patents

Diagnosesystem für ein Kraftfahrzeug Download PDF

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Publication number
EP0225971B1
EP0225971B1 EP86111701A EP86111701A EP0225971B1 EP 0225971 B1 EP0225971 B1 EP 0225971B1 EP 86111701 A EP86111701 A EP 86111701A EP 86111701 A EP86111701 A EP 86111701A EP 0225971 B1 EP0225971 B1 EP 0225971B1
Authority
EP
European Patent Office
Prior art keywords
diagnostic
display
control
test unit
error
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
EP86111701A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0225971A3 (en
EP0225971A2 (de
Inventor
Roland Dipl.-Ing. Ebner
Roland Dipl.Ing. Ehniss
Dieter Dr. Marx
Peter Dipl.-Ing. Schäfer
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.)
Dr Ing HCF Porsche AG
Original Assignee
Dr Ing HCF Porsche 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 Dr Ing HCF Porsche AG filed Critical Dr Ing HCF Porsche AG
Publication of EP0225971A2 publication Critical patent/EP0225971A2/de
Publication of EP0225971A3 publication Critical patent/EP0225971A3/de
Application granted granted Critical
Publication of EP0225971B1 publication Critical patent/EP0225971B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C5/00—Registering or indicating the working of vehicles
    • G07C5/08—Registering or indicating performance data other than driving, working, idle, or waiting time, with or without registering driving, working, idle or waiting time
    • G07C5/0808—Diagnosing performance data

Definitions

  • the invention relates to a diagnostic system for a motor vehicle according to the preamble of the main claim.
  • An electronic device with self-monitoring for a motor vehicle has therefore already been proposed in DE-OS 32 29 411.
  • An electronic control system for controlling the operation of motor vehicle devices is provided with an error detection device which can detect errors in sections of the system. It also includes a memory area for storing error data and addresses, an error display and a microcomputer assigned to the control system with an input and display unit.
  • this system is relatively complex and requires a special vehicle information system with a separate display and input unit. Should also use the system several electronic control system are monitored, a separate bus system is required from the vehicle information system to the respective control system. However, this requires a lot of wiring. The system is therefore complex and expensive and requires a lot of space due to the additional elements. It is therefore difficult to accommodate in the confined space of a dashboard area of a vehicle.
  • DE-A1-3001 331 discloses the use of a 2-line system for communication between a control system and a diagnostic unit in a motor vehicle.
  • Document DE-A-2 715 527 discloses a digital vehicle operating and control system in which the display system and microprocessor system are components of a combination instrument (digital tachograph).
  • a combination instrument also described in this magazine with an error display in code form via an electronic tachometer alleviates the problem described above, but is only used for monitoring or diagnostic display of errors in the combination instrument itself. Control systems of other motor vehicle devices, however, cannot be connected to this diagnostic system; you need the additional flashing light described above.
  • Fig. 1, 1 shows a diagnostic system for a motor vehicle.
  • Functional systems of the motor vehicle such as. B. an electronic fuel injection, an anti-lock braking system or the like, control systems 2, 3 are assigned. These control systems are connected via a diagnostic bus 4 to a test unit to be described later within a combination instrument 5.
  • a display system 6 of this combination instrument 5 is arranged in a dashboard area (not shown) which is in the driver's field of vision.
  • the display system 6 is intended to include one or more display units 7, 8 and 9 on which symbols and / or alphanumeric characters can be displayed.
  • the display units 7, 8 and 9 can be assigned, for example, to an electronic odometer 7 and multifunction displays (function display 8 and data display 9) of a commercially available on-board computer, for example for determining driving data, with a corresponding function and associated data being displayed outside of the diagnostic mode by a user Function switch 10 is preselectable.
  • the test unit within the combination instrument 5 is connected to contact sockets 12 and 13 of a plug device 14 via control lines 11;
  • the combination instrument 5 with the test unit and the display system 6 can be converted into a diagnostic mode via these.
  • Two control lines 11 are provided, the first control line ON (contact socket 12) for transferring the diagnostic system 1 to the vehicle's own (on-board) diagnosis and the second control line OFF (contact socket 13) for transferring the system to an off-board -Diagnosis (diagnosis using an external diagnostic system) is used.
  • the diagnostic bus 4 is also connected.
  • a contact socket 17 is also connected via an ignition switch 18 to a positive pole (+) of a battery 19, the negative pole (-) of which lies on a vehicle ground 20 and a contact socket 21 of the plug device 14.
  • the diagnostic bus 4 is constructed from a unidirectional stimulation line L (contact socket 16) and a unidirectional or bidirectional communication line K (contact socket 15).
  • a diagnostic bus is described, for example, in a working paper (ISO paper) N448, page 5, the 'International Organization for Standardization', working group for diagnostic questions.
  • control systems of type I which are capable of bidirectional communication (data exchange) with the test unit via the communication line K
  • control systems of type II which are capable of bidirectional communication (data exchange) with the test unit via the communication line K
  • Type II control system 3
  • the communication line K only serves unidirectional communication (response line from the control unit to the test unit).
  • the stimulus line L is used by the test unit to address a specific control system or to cause a memory area for error messages (type II) to be deleted (transmission of control commands (type II) and addresses).
  • the communication line K is used to transmit diagnostic data and, in the case of type I control units, also to transmit special diagnostic control commands and addresses.
  • the diagnostic process is controlled by an operator using the function switch 10.
  • the diagnostic process should have at least three switching options, the first switching option being used to select the control system to be diagnosed, the second for initializing and outputting errors and the third for clearing the memory area for error messages in the case of control systems addressed. If a fourth switching option is provided, an automatic, sequential diagnostic procedure can be triggered.
  • the control system to be diagnosed is selected by actuating the first switching option once or several times, with each actuation a control address being increased sequentially and a symbolic system address being displayed in the display system 6 (display unit 8).
  • the addressed control system is initialized by a first actuation of the second switching option and a control system identification, which specifies a control system in more detail, is displayed, and a further number of errors and / or type and / or duration and / or frequency and / or by further actuation of this switching option Environmental factors displayed when an error occurs; the last display shows whether the memory area for error messages should be deleted, which can be triggered by pressing the third switch option.
  • the displays that appear on the display system 6 during the diagnostic process can be either in plain text or in code form; the decoding is then carried out by the operator using a corresponding control system-specific table.
  • a representation of a power supply for the combination instrument 5 has been omitted for reasons of clarity.
  • a diagnosis plug 22 is to be inserted into the plug device 14 (FIG. 2); the diagnostic connector 22 comprises contact pins 23 to 28, which come into electrical contact with the corresponding contact sockets 12 to 13, 15 to 17 and 21.
  • the diagnostic connector 22 In the case of on-board diagnosis, the diagnostic connector 22 only has a short-circuit bridge 29 which bridges the contact pins 23 and 27. In the inserted state, the diagnostic connector 22 thus connects the control line ON to the positive pole (+) of the battery 19, provided the ignition switch 18 is closed. This places the combination instrument in diagnostic mode.
  • the off-board diagnosis is carried out by means of an external diagnosis system 30, which has all the necessary components, such as test unit (not shown), display system (display 31) and control elements 32 (function switch).
  • This external diagnostic system can further comprise a control computer that automatically controls the course of the diagnosis, as well as, for example, a printer 33.
  • the external diagnostic system 30 is to be connected to the contact sockets 12 to 13, 15 to 17 and 21 of the plug-in device 14 by means of a diagnostic plug 34 for off-board diagnosis via contact pins 35 to 40.
  • a short-circuit bridge connects the control line OFF with the ignition switch 18 closed to the positive pole (+) of the battery 19.
  • the external control device Via the contact pins 37 to 38, the external control device is connected to the diagnosis bus 4 and, if the external diagnosis system 30 does not contain its own power supply, via the contact pins 39, 40 connected to the battery 19.
  • the external diagnostic system 30 can, however, also be of simpler construction and largely correspond to the diagnostic system installed in the combination instrument 5. It only covers this the test unit, the display system 6 and the function switch 10; these are housed in a common housing and thus enable an operator to carry out a diagnosis outside the vehicle.
  • this external diagnostic system can also be used for vehicles which (for reasons of economy) do not have their own test unit in the combination instrument 5 and in which only the control systems 2, 3 are connected to one another and to the plug device 14 via the diagnostic bus. The connections from the control systems 2, 3 and the plug device 14 to the combination instrument 5 are omitted here.
  • the control system 2 described in more detail with reference to FIG. 4 is a control system of type I; it differs from type II essentially in the direction of data traffic on communication line K.
  • the control system 2 is generally constructed on the basis of a microcomputer 41 with a working memory (RAM) 42 and non-volatile (ROM, PROM, EPROM) 43 and electrically erasable (EEPROM) 44 memories.
  • RAM working memory
  • ROM non-volatile
  • EEPROM electrically erasable
  • Sensors 46 are connected to the microcomputer 41 via input lines 45, which detect analog and / or digital signals of the functional systems and, depending on this, control their actuators 47 via output lines 48.
  • the combination instrument 5 shown in FIG. 5 has in addition to the display system 6 further display units, not shown, such as. B. a tachometer, a tachometer, etc., which can also be designed in the form of a display.
  • display units not shown, such as. B. a tachometer, a tachometer, etc., which can also be designed in the form of a display.
  • the test unit can be implemented using a microcomputer system 49.
  • the diagnostic bus K, L is via a serial and the display system 6 via a serial or parallel interface connected to the microcomputer system 49.
  • the control lines 11 and the lines 50 of the function switch 10 reach the microcomputer system 49 via digital inputs.
  • the microcomputer system 49 can also serve as a common control system for the test unit and the further display units (not shown) and the display system 6. It then receives additional signals from analog and / or digital sensors 51 to 53, for example a tachometer sensor 51, a speed sensor 52, a temperature sensor 53, etc.
  • the microcomputer system 49 is thus used much more effectively; the diagnostic system (stationary vehicle) and the control of the displays (moving vehicle) are usually not used at the same time.
  • microcomputer system 49 and the control systems 2, 3 also include memories, clock generators, circuits for signal processing, driver stages and other components necessary for their operation. Since these are generally known to the person skilled in the art, their presentation has been omitted, as has the presentation of a power supply.
  • 6 shows examples of possible displays on the display system 6 during the diagnostic process.
  • 6a shows a display as it appears on the display units 7 to 9 after the diagnostic plug 22 has been inserted into the plug device 14 (corresponding to FIG. 2); it indicates that the diagnostic system 1 is in a diagnostic mode.
  • a preselected control system for example an ABS control system
  • Identification is carried out after the control system has been initialized the same; an identifier corresponding to FIG. 6c is displayed, with the aid of which the operator can see from a table what type the control system is (manufacturer, type, serial number, etc.).
  • the second switching option there is either a display corresponding to FIG. 6d if there is no error in the system or a display of errors or error-related information values according to FIG. 6e. With the displayed error codes, the operator can see from the above table which error is involved or which subsystem of the diagnosed control system has an error or defect.
  • the diagnostic process is finally ended by pulling the diagnostic connector 22 off the connector.
  • the microcomputer system 49 of the combination instrument 5 can of course include a programming option that modifies the display according to the linguistic circumstances of an exporting country (language coding).
  • Interventions to be carried out manually are marked with an oval, while parts of the Diagnostic processes are characterized by rectangles (performing a part), diamonds (queries), parallelograms (displays) and circles (program branches).
  • a first step 54 the diagnostic mode is initiated by inserting the diagnostic connector 22 into the connector device 14; the diagnostic mode, 55 (FIG. 6b) is then displayed.
  • the test system then goes into a waiting loop 56 until the first switching option of the function switch 10 is activated.
  • the first control system is then displayed, 57.
  • a query is made as to whether the first switching option has been activated a second time, 58. If so, a control device address is increased, 59 and the addressed control device is displayed, 60 and the query 58 is returned; if no, an inquiry is made 61 as to whether the second switching option is activated. If no, the diagnostic process has ended and the diagnostic connector 22 can be removed, 62; if so, an error is output in accordance with FIG. 8 or 9, depending on whether it is a control system with unidirectional or bidirectional K line (branching at A, 63).
  • a query is made as to whether the error memory should be deleted, 65, (FIG. 6f). If the third switching option is actuated, the error memory is deleted, 66 and there is an indication that the error memory has been deleted, 67, (FIG. 6g) and an indication of the selected control system, 68. The test unit then returns to query 58.
  • the previously selected control system is displayed, 69. Then there is again an inquiry, 70 as to whether the second Switching option was pressed again. If so, the method returns to branching at A, 63, with which the error output of the selected control system can be repeated, if not, the query is returned to query 58.
  • baud rate data transmission speed
  • one or more identification blocks are sent from the control system 3 to the test unit, 73, whereupon a control system identification accordingly Fig. 6c appears on the display unit 8, 74. There is then a transmission of an error block, 75. If there are no errors, query 76, the display shows "zero errors" 77, corresponding to Fig. 6d, whereupon the test unit to branch point C. , 71, returns.
  • an error code and, if present, error-associated information values are displayed, 78, corresponding to FIG. 6e. Subsequently, a query is made as to whether the error output should continue, 79; if the first switching option is actuated, the error output is aborted, 80, and returned to branch point C, 71.
  • the next question is whether there are further errors, 81. If no, an "erase memory?" 82, corresponding to FIG. 6f, and a return to branch point B, 64; if yes, a display of the current error code 83 appears, corresponding to FIG. 6e, whereupon the test unit returns to query 79.
  • the control system is initially initialized again by the test unit and the signal for recognizing the baud rate and the keywords is transmitted by the selected control system, 84.Then the control system again sends one or more identification blocks to the test unit, 85, whereupon the latter Control system identification, 86 (corresponding to FIG. 6c). After the number of error blocks 87 to be transmitted 87 has been read in by the test unit, if there are no errors (query 88), the display shows "zero errors" 89, corresponding to FIG. 6d. The system then returns to branch point C, 71.
  • the first error block 90 is read in, and an error code of a first error is displayed in the first error block, 91. Then a query is made as to how to proceed in the error output, 92. If the first switching option is actuated, this is done an abort of error output, 93, and the test unit returns to branch point C, 71. If the second switching option is actuated, it is first examined whether there are further errors or error-associated information values, 94.
  • fault or control unit designations can of course also appear in plain text instead of in code form on the display systems, provided that they are designed accordingly.
  • the function switch 10 comprises a fourth switching option with which an automatic diagnostic sequence can be controlled in the diagnostic mode, which displays the respective errors for some time or reproduces them on an (external) protocol unit; All control systems are diagnosed one after the other and all errors are read out. However, it also makes sense here if the error memory is deleted manually.
  • the diagnostic system can also include a vehicle self-diagnosis which - even while driving - permanently recognizes general and / or safety-relevant system defects in the control or functional systems and / or other vehicle components and displays them to the driver while driving.
  • the error display in the diagnostic mode can be limited to special system defects, while general system defects of the motor vehicle can also be displayed outside the diagnostic mode. It can also be provided that the display of system defects from additional ones the driver is accompanied by the respective system defect-related behavior instructions (e.g. "visit workshop”, “drive slowly”, “stop immediately”, etc.).
  • test unit and / or the combination instrument 5 can likewise comprise a self-monitoring function and / or can be checked or monitored by the external diagnostic system.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Testing And Monitoring For Control Systems (AREA)
  • Test And Diagnosis Of Digital Computers (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Regulating Braking Force (AREA)
EP86111701A 1985-11-15 1986-08-23 Diagnosesystem für ein Kraftfahrzeug Expired - Lifetime EP0225971B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853540599 DE3540599A1 (de) 1985-11-15 1985-11-15 Diagnosesystem fuer ein kraftfahrzeug
DE3540599 1985-11-15

Publications (3)

Publication Number Publication Date
EP0225971A2 EP0225971A2 (de) 1987-06-24
EP0225971A3 EP0225971A3 (en) 1988-03-02
EP0225971B1 true EP0225971B1 (de) 1992-04-15

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EP86111701A Expired - Lifetime EP0225971B1 (de) 1985-11-15 1986-08-23 Diagnosesystem für ein Kraftfahrzeug

Country Status (4)

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US (1) US4748843A (ja)
EP (1) EP0225971B1 (ja)
JP (1) JPS62128851A (ja)
DE (2) DE3540599A1 (ja)

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DE3540599C2 (ja) 1991-08-08
EP0225971A3 (en) 1988-03-02
US4748843A (en) 1988-06-07
DE3684888D1 (de) 1992-05-21
EP0225971A2 (de) 1987-06-24
DE3540599A1 (de) 1987-05-21
JPS62128851A (ja) 1987-06-11

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