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
  • G07C5/0841—Registering performance data
  • G07C5/085—Registering performance data using electronic data carriers

Definitions

• the invention relates to a data processing system, in particular a tachograph for a motor vehicle, with a controller and a memory.
• a method for operating a data processing system of the type mentioned is the subject of the invention.
• the invention has set itself the task to better ensure a traceability of the emergence of errors in the operation of a data processing system.
• the memory is designed as a drain memory and the controller is designed such that the processes of the tachograph are logged in a flow memory, the drain memory has at least one ring memory, which is organized circularly and is designed such that the oldest entry is overwritten by the newest entry.
• a method according to claim 4 for eliminating the disadvantages of the prior art is in side order proposed.
• the decisive advantage of the invention lies in the fact that a multiplicity of run-off events can be logged in the process memory according to the invention, which possibly are harbingers of a significant error, and nevertheless the size of the memory does not have to exceed economically sensible limits even during prolonged operation of the system.
• the size of the entire sequence memory can be selected such that it is always possible to sufficiently adequately document a sufficient time before any significant error.
• a particularly reliable traceability of error generation offers the invention, when the corresponding memory is completely as Drain memory is formed. In this case, the drain memory forms its own hardware module and is thus sufficiently decoupled from the possibly faulty function of other components of the system.
• Particularly useful is an embodiment of the drain memory according to the invention, if at least part of it is linearly organized.
• Such a linear memory prevents the overwriting of particularly significant event information, which are preferably permanently stored in it.
• errors or irregularities occurring in the process according to the invention caused by a controller can be permanently registered.
• Run-time benefits have a coordinated writing of different functional modules of events that log the flow into the flow memory.
• an entry may also comprise a text describing the event in more detail, which additionally simplifies the interpretation of the contents of the sequence memory.
• the sequence memory additionally comprises the function of a debuggers, in addition to the tamper-evident function.
• Each entry contains a record type that documents what type of event it is in the recorded.
• a particularly advantageous breakdown of events in recording types results when a first assignment of the recording type to the
• a classification of events in record types also has the advantage that the recording of events from the ring buffer to the linear memory can change if the record type indicates that the event to be recorded has some significance. In this way, significant events are also documented in critical functional states.
• the linear memory has a certain storage volume. If the controller encounters the same limits when recording events in the linear memory, the entry other events is aborted.
• Indicates writing position pointer In particular, if the contents of the sequence memory can be read out via an interface, it makes sense to hold the last reading position by means of a reading reading pointer, so that in close successive analyzes of the processes, for example as part of the elimination of programming errors, not always the full contents of the process memory time-consuming must be read. For this purpose, it is particularly useful that in the event that the last write operations have taken place in the ring memory, the data is read from the last reading position to the current writing position and in the event that the last write operations in the linear memory have taken place, the entire contents of the sequence memory is read out.
• the ring memory differs from the linear memory in that the addressing order of the individual memory locations leads to those with the most significant address followed by those with the least significant address, so that the actually physically linear memory is cyclically rewritten over and over again and therefore never becomes full reached a limit. So that the ring memory and the entries coming from the linear memory can be perfectly identified even after the read-out, it makes sense if entries entered in the linear memory have a separate identification.
• Figure 1 is a schematic representation of the invention.
• FIG. 1 shows a digital tachograph DTCO which has a sequence memory SEQ according to the invention as part of a memory MEM.
• the DTCO tachograph includes a Control CPU, which coordinates the sequences of the tachograph DTCO in general and the reading and writing of the sequence memory SEQ in particular
• the sequence memory SEQ is composed of a ring memory RNG and a linear memory LIN.
• the ring buffer RNG is described by the controller CPU in such a way that a respective newest entry NER is overwritten by the respectively oldest entry OER, if a complete assignment has already taken place once.
• entries are sequentially filed among the addresses, with the oldest entry OEL in the linear memory at the least significant address and the newest entry NEL in the linear memory at the most significant occupied address.
• the entries document various events E which occur during the operation of individual function modules FM1, FM2.
• the ring memory RNG is separated from the linear memory LIN in the sense of a separation mark DRL, wherein the separation mark DRL can be shifted by the control CPU as required. In this way, the fixed storage volume VOL of
• Sequence memory SEQ be used optimally.
• the individual entries of events E each comprise a timestamp TSP, a record type ETY, a feature MOD identifying feature MOD, an event number ENR, a line number CNR in which a corresponding program code was executed on occurrence of the event, and a description ETX of the event ,
• Record type ETY documents the type of event E that is recorded.
• the record type ETY can have different classifying assignments FO1-FO6, which according to their final number have the following meanings: documentation of what the system was doing or in what state it was shifted (FO1), documentation of a state that points to an error (FO2 ), Documentation of an error whose effects are limited to a single module (F03), documentation of an error that requires a reboot of the entire system (F04), documentation of an error, which can only be remedied by means of an immediate system start (F05) and documentation, which is no longer possible to continue operation (F06).
• the control CPU causes the event E to no longer be entered in the ring buffer RNG but instead into the linear memory LIN.
• the subsequent events E are also entered in the linear memory LIN until it is completely occupied and the entry of events E is aborted.
• the tachograph DTCO For reading out the recordings from the sequence memory SEQ, the tachograph DTCO has an interface IF. To speed up the writing and reading operations, the sequence memory is provided with a writing position indicator WI and a reading position indicator RI. If a plurality of read requests are carried out in quick succession, the interface IF transmits only the data volume beginning with the read position indicator RI up to the write position indicator WI. Subsequently, the
• Reading position indicator updated so that a position is identical to the writing position indicator WI.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Retry When Errors Occur (AREA)
• Techniques For Improving Reliability Of Storages (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 2005
  • 2005-09-19 DE DE102005044703A patent/DE102005044703A1/de not_active Ceased
• 2006
  • 2006-09-12 US US12/067,149 patent/US20080262674A1/en not_active Abandoned
  • 2006-09-12 RU RU2008115461/09A patent/RU2008115461A/ru not_active Application Discontinuation
  • 2006-09-12 EP EP06793467A patent/EP1927085A1/de not_active Withdrawn
  • 2006-09-12 WO PCT/EP2006/066300 patent/WO2007033923A1/de active Application Filing
  • 2006-09-12 JP JP2008531673A patent/JP2009509256A/ja active Pending
  • 2006-09-12 CN CNA2006800342411A patent/CN101268495A/zh active Pending

Non-Patent Citations (1)

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