EP1966944A1 - Unite de surveillance destinee a la surveillance ou a la commande de l'acces d'un abonne a un bus de donnees et abonne pourvu d'une telle unite de surveillance - Google Patents

Unite de surveillance destinee a la surveillance ou a la commande de l'acces d'un abonne a un bus de donnees et abonne pourvu d'une telle unite de surveillance

Info

Publication number
EP1966944A1
EP1966944A1 EP06830565A EP06830565A EP1966944A1 EP 1966944 A1 EP1966944 A1 EP 1966944A1 EP 06830565 A EP06830565 A EP 06830565A EP 06830565 A EP06830565 A EP 06830565A EP 1966944 A1 EP1966944 A1 EP 1966944A1
Authority
EP
European Patent Office
Prior art keywords
bus
monitoring unit
unit
monitoring
local
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.)
Ceased
Application number
EP06830565A
Other languages
German (de)
English (en)
Inventor
Thomas Fuehrer
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1966944A1 publication Critical patent/EP1966944A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0685—Clock or time synchronisation in a node; Intranode synchronisation
    • H04J3/0694—Synchronisation in a TDMA node, e.g. TTP
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/0703—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation
    • G06F11/0706—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation the processing taking place on a specific hardware platform or in a specific software environment
    • G06F11/0745—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation the processing taking place on a specific hardware platform or in a specific software environment in an input/output transactions management context
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/0703—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation
    • G06F11/0751—Error or fault detection not based on redundancy
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/30—Monitoring
    • G06F11/3003—Monitoring arrangements specially adapted to the computing system or computing system component being monitored
    • G06F11/3027—Monitoring arrangements specially adapted to the computing system or computing system component being monitored where the computing system component is a bus
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/30—Monitoring
    • G06F11/3089—Monitoring arrangements determined by the means or processing involved in sensing the monitored data, e.g. interfaces, connectors, sensors, probes, agents
    • G06F11/3096—Monitoring arrangements determined by the means or processing involved in sensing the monitored data, e.g. interfaces, connectors, sensors, probes, agents wherein the means or processing minimize the use of computing system or of computing system component resources, e.g. non-intrusive monitoring which minimizes the probe effect: sniffing, intercepting, indirectly deriving the monitored data from other directly available data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/407—Bus networks with decentralised control
    • H04L12/417—Bus networks with decentralised control with deterministic access, e.g. token passing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L2012/40208—Bus networks characterized by the use of a particular bus standard
    • H04L2012/40241—Flexray

Definitions

  • MONITORING UNIT FOR MONITORING OR CONTROLLING ACCESS OF A PARTICIPANT TO A DATA BUS AND A PARTICIPANT WITH SUCH A MONITORING UNIT
  • the present invention relates to a monitoring unit locally associated with a bus controller of a subscriber of a communication system for monitoring and controlling access to a data bus in accordance with a particular protocol.
  • the bus controller accesses the data bus via a bus driver, and the monitoring unit monitors and controls the access authorization of the bus driver according to the protocol specification.
  • the invention also relates to a subscriber of a data bus comprising
  • the subscriber has a bus controller and a bus driver, the bus controller being connected to the data bus via the bus driver.
  • the subscriber also has a bus controller associated with the monitoring unit for monitoring and controlling the access authorization of the bus driver on the data bus according to a specific protocol specification.
  • the present invention also relates to a central monitoring unit of a communication system for monitoring and controlling the access of multiple users of the communication system to a data bus of the
  • Each subscriber has a bus controller and a bus driver, the bus controller being connected to the data bus via the bus driver connected.
  • the monitoring unit monitors and controls the access authorization of the bus driver of several users of the communication system to the data bus according to a specific protocol specification.
  • CAN Controller Area Network
  • TTCAN Time Triggered CAN
  • TTP / C Time Triggered Protocol Class C
  • FlexRay is a fast, deterministic and fault-tolerant bus system, especially for use in motor vehicles.
  • the FlexRay protocol operates on the principle of Time Division Multiple Access (TDMA), whereby the subscribers or the messages to be transmitted are assigned fixed time slots in which they have exclusive access to the communication connection.
  • TDMA Time Division Multiple Access
  • the time slots are repeated in a fixed cycle, so that the time at which a message is transmitted over the bus, can be accurately predicted and the bus access is deterministic.
  • FlexRay divides the communication cycle into a static and a dynamic part or into a static and a dynamic segment.
  • the fixed time slots are located in the static part at the beginning of the bus cycle.
  • the time slots are specified dynamically.
  • the exclusive bus access is only possible for a short time, for the duration of at least one so-called mini slot. Only if a bus access occurs within a minislot, the time slot is extended to the time required for the access. Thus, bandwidth is only consumed when it is actually needed.
  • FlexRay communicates via one or two physically separate lines with a maximum data rate of 10 Mb / s.
  • the two channels correspond to the physical layer, in particular the so-called OSI (Open System Architecture) layer model. These are mainly used for the redundant and thus fault-tolerant transmission of messages, but can also transmit different messages, which could then double the data rate. It is also conceivable that the signal transmitted via the connecting lines results as a difference signal as the difference of the signals transmitted via the two lines.
  • the physical layer is designed such that it enables electrical or optical transmission of the signal or signals via the line (s) or a transmission by other means, for example by radio.
  • Synchronization messages transmitted in the static part of the cycle using a special algorithm according to the FlexRay specification, the local time (local time base) of a subscriber is corrected so that all local clocks to a global clock (global time base) run synchronously.
  • the local time (local time base) of a subscriber is corrected so that all local clocks to a global clock (global time base) run synchronously.
  • global time base For the various known communication systems, there are a number of ways to avoid or solve access conflicts. In CAN, for example, the so-called bitwise arbitration is used. This one is very robust. Runtime phenomena, however, limit the maximum transmission speed as a matter of principle.
  • the access problem is solved by approach and configuration, the conflicts are already avoided offline. However, a prerequisite is a common understanding of the time, which has validity throughout the network (with FlexRay: global time base).
  • BG bus guardian
  • TTCAN a combination of CAN and timed bus access, solves the bitwise arbitration conflict. However, it may happen that the (timely) correct message content is not provided.
  • the use of a bus guardian for messages in the static window can therefore be useful for TTCAN, for example for safety-relevant systems such as x-by-wire systems.
  • the local bus guardian is supplied via the clock of the bus controller and its lap information is used for the monitoring function.
  • the current FlexRay protocol specification v2.1 describes a concept that is limited in terms of the time monitoring of the communication protocol or the communication controller.
  • a macrotick (MT) of the local FlexRay communications controller clocks its local bus guardian.
  • the time slot with transmit activity is also indicated by the communication controller by an ARM signal.
  • the timing (the temporal
  • Offset correction is available, for example, with TTCAN, TTP / C, and FlexRay, whereby in FlexRay the offset correction phase takes place during the so-called Network Idle Time (NIT) of the local communication controller at the end of a communication cycle.
  • NIT Network Idle Time
  • the correction of the offset at the end of a communication round or a double round shortens or lengthens the local round within specified specified limits.
  • the next round of communication begins sooner or later due to the correction of a few so-called microticks ( ⁇ T).
  • ⁇ T microticks
  • the local bus guardian must allow this offset correction.
  • the timer monitor must accept this.
  • the Bus Guardian has no knowledge of the effects of offset correction on the next communication round. Also in this case, the transmission timeslots of the different subscribers may overlap. The likelihood of overlap increases as the number of laps increases.
  • the Bus Guardian concept according to the FlexRay protocol specification v2.1 is based on the assumption that the described error cases due to permanent disturbances occur only with low probability or that these disturbances or errors are recognized by additional measures in the participant host or by additional functionalities can be.
  • the present invention has the object to expand known monitoring concepts such that even permanent disturbances in the communication can be detected and optionally corrected or corrected.
  • the monitoring unit Based on the local monitoring unit of the type mentioned above, it is proposed that the monitoring unit:
  • Bus driver has received messages, having an oscillator terminal, - a clock synchronization unit for synchronization of a local clock of
  • Monitoring unit a bus access control unit for establishing a temporal
  • Bus controller has, and a comparator unit to detect deviations between the provided transmit information and the actual bus access of the bus controller or the bus driver based on the synchronized local clock of the monitoring unit.
  • the local monitoring unit is connected to the data bus via the bus driver, messages transmitted via the data bus can not only be received by the bus controller (in the case of the FlexRay: communication controller), but also by the monitoring unit.
  • the decoding unit By the decoding unit, the received messages can be decoded by the monitoring unit according to the protocol specification used in the communication system.
  • the local monitoring unit By means of these two measures, receiving and decoding of messages, it is possible for the local monitoring unit according to the invention to receive and understand synchronization messages sent via the data bus (so-called sync frames).
  • the monitoring unit Via the oscillator connection, the monitoring unit can obtain its own time clock, which is completely independent of the local bus controller.
  • the clock synchronization unit is a logic that allows the local monitoring unit to establish a globally synchronized time base according to the protocol specification used in the communication system.
  • the bus access control unit is a logic that can establish the temporal relationship between the reception of the synchronization messages and the communication rounds according to the protocol specification used.
  • the bus access control unit is also referred to as Media Access Control (MAC).
  • the comparator unit (so-called comparator) of the local monitoring unit determines differences between a clock signal of the local monitoring unit or the information provided therefrom intended transmission information of the bus controller and the actual bus access of the bus controller. If such differences are detected, preferably a so-called fail-silent behavior of the local monitoring unit is triggered, thus avoiding the transmission of the local bus controller.
  • the local monitoring unit according to the invention can also be referred to as bus guardian or bus guardian (BG).
  • An essential functionality of the monitoring unit according to the invention is the complete independence of time from the local bus controller or the local time base of the bus controller and the generation of a separate, local time base, which is synchronized to the global time.
  • By checking the consistency of the local time base of the monitoring unit to the local time base of the associated bus controller access errors, especially due to permanent interference, can be reliably and reliably detected, even with increasing number of lapses.
  • the errors described above, in particular due to permanent disturbances, are secured by the present invention and a fail-silent behavior of the entire subscriber can be achieved.
  • the present invention overcomes the conceptual deficiencies of the known Bus Guardian concepts used in previously known communication systems.
  • a cost-optimized implementation of the bus guardian concept is possible since only the logic components and functionalities necessary for the reception, decoding and evaluation of the synchronization messages are provided in the local monitoring unit according to the invention.
  • the components used are all known per se and used elsewhere in communication systems components that are now integrated in a particularly advantageous manner in the monitoring unit according to the invention.
  • the components additionally integrated into the local monitoring unit can therefore also be used in other areas of the system
  • Communication system for example, in the bus controller, are used so that high numbers of components result, which leads to a reliability in manufacturing and low unit prices.
  • inventive concept can be easily integrated into a so-called monitoring computer of a communication system.
  • a central monitoring unit is not assigned to a single subscriber of the communication system, but monitors and controls the access of several participants of the Communication system on the data bus.
  • the concept of the monitoring computer has the advantage that a separate bus guardian is not necessary for each participant, but that their functionalities can be integrated into a single or several monitoring computers.
  • the application of the local monitoring unit according to claim 6 is particularly suitable for a FlexRay communication system in which the communication controller notifies the local bus guardian via an ARM signal the beginning of a communication cycle.
  • the embodiment according to claim 7 is suitable for other than FleyRay communication systems, for example for a TTCAN communication system, where the transmission information of the local bus controller can be stored in advance in the bus Guardian. The stored transmission information can be used, for example, to generate an ARM signal. About the reference message a round synchronization is achieved or made plausible.
  • FIG. 1a shows a simplified topology of a device according to the invention
  • FIG. 1b shows a simplified topology of a device according to the invention
  • Figure 2 shows a known from the prior art participants of
  • Figure 3 shows the course of an enable signal with which a bus Guardian the
  • FIG. 4 shows a subscriber according to the invention with a novel bus
  • Figure 5 shows the course of part of the communication via a data bus of the communication system according to Figure Ia and Ib.
  • FIG. 1 a a simplified topology of a known FlexRay communication system is indicated in its entirety by the reference numeral 1.
  • the communication system 1 comprises a physical layer, which in the present case is designed as a data bus 2 with two electrically conductive lines.
  • the physical layer can also be realized by optical waveguides or by radio links.
  • Connected to the data bus 2 are a plurality of FlexRay subscribers 3, which are also referred to as controllers or hosts. Strictly speaking, however, the host also comprises a microcontroller, which is designated by reference numeral 4 in FIG.
  • the subscriber 3 and the microcontroller 4 together form the actual host 5.
  • the subscribers 3 of the FlexRay communication system each comprise a FlexRay communication controller 6 (so-called communication controller), which receives information 7 to be transmitted via the data bus 2 from the microcontroller 4 and according to the protocol specification used in the communication system 1 Example according to the FlexRay protocol specification v2.1, bringing the correct data format for transmission over the data bus 2.
  • the information 7 in the correct data format is transmitted to the FlexRay bus driver 8 (so-called bus driver) of the subscriber 3, which brings it into a form required for transmission via the data bus 2, also according to the protocol specification used ,
  • 3 bus guards 9 are provided in the subscribers, which control the access authorization of the
  • the bus drivers 8 can only apply information or data packets to the data bus 2 if they receive a corresponding enable signal from the associated bus guardian 9 (so-called enable signal) 10.
  • the FlexRay communication system 1 of Figure Ia has a particularly simple topology.
  • the topology of the data bus 2 may also be annular or star-shaped. It is likewise conceivable to arrange amplifier elements, for example as part of an active star, in the data bus structure 2 for transmission of the data packets over longer distances.
  • FIG. 1 b shows another topology of a FlexRay communication system 1, which is also known per se.
  • This topology differs from the topology known from FIG. 1a, in particular in that the subscribers 3 of the communication system 1 are not each equipped with a separate bus guardian. Rather, in the embodiment shown in Figure Ib, the bus guardian functionality from the individual participants 3 to a single Monitoring computer 11 are summarized.
  • the monitoring computer 11 also has a communication controller 6 and a bus driver 8, so that the monitoring computer 11 can send and receive information via the data bus 2.
  • the extended bus guardian functionalities (Extended Bus Guardian, BGX) of the monitoring computer 11 are designated by the reference numeral 12.
  • the monitoring computer 11 is preferably not connected via the data bus 2 via another communication connection (not shown) with the participants 3, so that the monitoring computer 11, the participants 3 even then control and optionally interrupt their transmission activity, if one of the participants 3 constantly sends and thereby blocks the data bus 2 for any data transmission by the other participants 3 and the monitoring computer 11.
  • the monitoring computer 11 has information about its transmission activities for each of the subscribers 3, monitors the transmission activities of the subscribers 3 and controls them.
  • FIG. 2 shows a FlexRay subscriber 3 known from the prior art with a known Bus Guardian concept.
  • the concept described in the FlexRay Protocol Specification v2.1 is limited with regard to the time monitoring of the communication protocol or the communication controller 6.
  • the bus guardian 9 derives its time base from the corrected macrotick (MT) signal 13, which it receives from the communication controller 6.
  • the time slot with transmit activity (time slot # 2 in FIG. 3) is additionally indicated by an ARM signal 14 of the communication controller 6.
  • the ARM signal 14 is used to synchronize the beginning of a communication cycle or the transmission slots of the communication cycle.
  • the time sequences (so-called timing) of the monitored FlexRay communication controller 6 is roughly monitored only by an RC oscillator 15 or monitored by an additional quartz oscillator with higher resolution.
  • the RC oscillator 15 only allows a rough monitoring of the macrotick signal 13, so that deviations are recognized as such only above 20 to 30% of the signal.
  • the time base of the bus guardian 9 is not independent of the time base of the communication controller 6, but depending on the macrotick signal 13.
  • a complete independence of the time base of the communication -Controllers 6 can not be achieved.
  • Communication controller 6 transmitted to the bus driver 8 are designated in Figure 2 by the reference numeral 16.
  • the data 16 are applied to the data bus 2 via the bus driver 8.
  • the activity of the bus driver 8 is monitored and / or controlled so far by the bus guardian 9 that the bus driver 8 can only apply the data 16 to the data bus 2 when the bus guardian 9 the
  • Access authorization of the bus driver 8 confirmed by applying an enable signal 17 to the bus driver 8.
  • the known monitoring concept has weaknesses in particular in cases in which there are permanent disturbances due to errors or errors
  • Registers of the communication controller 6, which are used for clock correction, are faulty and undetected, the local communication controller 6 and thus also the local bus guardian 9 drifts in comparison to the rest of the communication network 1. Since the communication controller 6 and the bus Guardian 9 drift together, the bus guardian 9 can not detect any deviations of the transmission activity of the communication controller 6 of the communication schedule.
  • the offset correction phase is used inter alia to synchronize the local time base of the subscriber 3 on the global time base of Communication System 1. In order to make such a correction, it may be corrected within specified limits. The subsequent round of communication then starts by a few microticks ( ⁇ T) sooner or later. The local bus guardian 9 must allow this correction. The timer monitoring must accept this. However, there is no bus guardian knowledge regarding the effects of offset correction on the next round of communication. Also in this case, the transmission time slots may overlap. The likelihood of such overlap increases as the number of laps increases.
  • FIG. 3 shows the profile of the enable signal 17 of the known subscriber 3 shown in FIG. 2 with the known monitoring concept.
  • the illustrated subscriber 3 is allowed to transmit only in the transmit slot # 2, so that the enable signal 17 for the illustrated subscriber 3 must permit the transmission of data by the bus driver 8 during the entire transmit slot # 2.
  • the enable signal 17 changes from "Disable” to "Enable” a short time before the beginning of the transmission slot # 2 and only after some time after the end of the transmission slot # 2 from “Enable” back to "Disable”.
  • FIG. 4 shows a subscriber 3 according to the invention of a communication system 1 in which the novel monitoring concept is realized.
  • the bus guardian 9 of the subscriber 3 according to the invention is designed to realize the present invention in a special way. This results in an essential difference to the known participants 3 that the bus guardian 9 has its own local, from the time base of the communication controller 6 completely independent time base. This local time base of the bus guardian 9, as well as the time base of the communication controller 6 all participants 3 synchronized to the global time base of the communication system 1. On the basis of the local, independent time base of the local bus guardian 9 according to the invention, an evaluation and control of the access activities of the bus driver 8 then takes place on the data bus 2.
  • the Bus Guardian 9 essentially contains the following components for realizing the novel monitoring concept:
  • Data bus 2 are transmitted, is communicated.
  • a bus access control unit 24 for establishing a temporal relationship between received messages and a communication cycle in accordance with the FlexRay protocol specification. - Information about according to Karlunikationsschedule provided
  • a comparator unit 25 which serves to detect deviations between the provided transmit information according to the ARM signal 14 and the actual bus access based on the synchronized local time base of the bus guardian 9.
  • the connection 18 and the decoding unit 19 are required in order to be able to receive via the bus driver 8 FlexRay data frames transmitted via the data bus 2, in particular the synchronization messages (so-called sync frames).
  • a separate time base is built up according to the rules of the FlexRay protocol specification v2.1.
  • the consistency to the local communication controller 6 is checked in the bus access control unit 24, which is also referred to as Media Access Control (MAC).
  • MAC Media Access Control
  • each communication cycle comprises four transmit slots # 1 through # 4 in the illustrated example.
  • the subscriber 3 from FIG. 4 is allowed to transmit via the data bus 2 in the send slot # 2. This means that the enable signal must be at "Enable” for at least the duration of the entire transmit slot # 2.
  • synchronization messages S are transmitted via the data bus 2, which are received by the participants 3 and used to synchronize the local time bases in the communication controllers 6 of the participants 3.
  • the synchronization messages S are additionally used for the synchronization of the bus guardians 9.
  • the messages S are received by the bus driver 8 of a subscriber 3 and placed via a connecting line (sync) 26 to the terminal 18 of the bus guardian 9. There, they are decoded in the manner described above and used to synchronize the independent of the time base of the communication controller 6 own local time base of the bus guardian 9.
  • the present invention overcomes the conceptual vulnerabilities of known bus guardian concepts in the FlexRay protocol specification v2.1, as well as in other protocol specifications. In this case, a cost-optimized implementation is possible because only necessary logic or functionality extends the bus Guardian 9.
  • many components can be taken from existing communication controllers 6 or other components of a communication system.
  • the novel monitoring concept described above with reference to FIGS. 4 and 5 can not only be integrated into the local bus guardians 9 of the subscribers 3 of the communication system 1, but could also be combined in a monitoring computer 11 to form an extended bus guardian functionality 12 (BGX) be (see Figure Ib).
  • BGX extended bus guardian functionality 12
  • Communication system 1 realized, but only in one or more monitoring computers 11, each monitor and / or control the access authorization of the bus driver 8 of several participants 3 of the communication system 1.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Quality & Reliability (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computing Systems (AREA)
  • Mathematical Physics (AREA)
  • Small-Scale Networks (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

La présente invention concerne une unité de surveillance locale (9) qui est associée localement à un contrôleur de bus (6) d'un abonné (3) d'un système de communication (1), et une unité de surveillance centrale (11) d'un système de communication (1) destinée à la surveillance et / ou à la commande de l'accès de plusieurs abonnés (3) à un bus de données (2). Le concept de surveillance selon la présente invention présente une caractéristique importante, à savoir que l'unité de surveillance (9, 11) possède une base de temps propre, indépendante d'une base de temps locale d'un contrôleur de communication (6) des abonnés (3), qui est synchronisée sur une base de temps globale du système de communication (1). Cette base de temps locale propre est utilisée dans l'unité de surveillance (9, 11) pour surveiller et / ou commander l'autorisation d'accès du contrôleur de communication (6) ou plus précisément d'un circuit d'attaque de bus (8) situé sur le bus de données (2). Les conflits d'envoi entre abonnés (3), en particulier en raison de perturbations permanentes dans un ou plusieurs des abonnés (3), peuvent être ainsi identifiés et évités de manière fiable.
EP06830565A 2005-12-22 2006-12-12 Unite de surveillance destinee a la surveillance ou a la commande de l'acces d'un abonne a un bus de donnees et abonne pourvu d'une telle unite de surveillance Ceased EP1966944A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005061403A DE102005061403A1 (de) 2005-12-22 2005-12-22 Überwachungseinheit zur Überwachung und Steuerung des Zugriffs eines Teilnehmers auf einen Datenbus und Teilnehmer mit einer solchen Überwachungseinheit
PCT/EP2006/069617 WO2007074057A1 (fr) 2005-12-22 2006-12-12 Unite de surveillance destinee a la surveillance ou a la commande de l'acces d'un abonne a un bus de donnees et abonne pourvu d'une telle unite de surveillance

Publications (1)

Publication Number Publication Date
EP1966944A1 true EP1966944A1 (fr) 2008-09-10

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EP06830565A Ceased EP1966944A1 (fr) 2005-12-22 2006-12-12 Unite de surveillance destinee a la surveillance ou a la commande de l'acces d'un abonne a un bus de donnees et abonne pourvu d'une telle unite de surveillance

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US (1) US20090327549A1 (fr)
EP (1) EP1966944A1 (fr)
JP (1) JP2009521152A (fr)
DE (1) DE102005061403A1 (fr)
WO (1) WO2007074057A1 (fr)

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JP4844658B2 (ja) * 2009-08-07 2011-12-28 株式会社デンソー 診断装置および診断システム
JP2011234212A (ja) * 2010-04-28 2011-11-17 Toyota Motor Corp タスク制御装置
JP5717240B2 (ja) 2010-08-09 2015-05-13 国立大学法人名古屋大学 通信システム及び通信装置
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