EP1417469A2 - Procede de communication et module de communication - Google Patents

Procede de communication et module de communication

Info

Publication number
EP1417469A2
EP1417469A2 EP02758253A EP02758253A EP1417469A2 EP 1417469 A2 EP1417469 A2 EP 1417469A2 EP 02758253 A EP02758253 A EP 02758253A EP 02758253 A EP02758253 A EP 02758253A EP 1417469 A2 EP1417469 A2 EP 1417469A2
Authority
EP
European Patent Office
Prior art keywords
data
communication module
local applications
applications
diagnostic
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.)
Withdrawn
Application number
EP02758253A
Other languages
German (de)
English (en)
Inventor
Rainer Burkhardt
Andreas Heinzelmann
Steffen Koser
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.)
Mercedes Benz Group AG
Original Assignee
DaimlerChrysler 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 DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP1417469A2 publication Critical patent/EP1417469A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H04L43/50—Testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/06—Management of faults, events, alarms or notifications

Definitions

  • the invention relates to a communication method for the defined, uniform provision of data, in particular in the overall vehicle diagnosis, such as. B. the system diagnosis, in a motor vehicle and a communication module for performing the method.
  • the method is applied within a networked system.
  • the networked system includes in. Case of system diagnosis in a motor vehicle control devices which are networked with a diagnostic device.
  • a central application such as system diagnostics requires process data of the individual control unit applications at runtime. In the case of onboard diagnostics, this data must always be made available event-oriented for system diagnostics.
  • Onboard diagnosis is the product-integrated self-diagnosis of the vehicle itself, regardless of a service station.
  • the diagnostic device is therefore in the motor vehicle.
  • a precisely defined, uniform provision of the system diagnosis-relevant data by the control units is required.
  • the type of data provision therefore has a high impact on the result of the system diagnosis.
  • DE 195 41 816 discloses a diagnostic system for a motor vehicle, data formatting being carried out in a communication module for all types of control units installed in the vehicle with different communication protocols, so that vehicle diagnosis is carried out independently of the communication protocols of the control units. can be performed.
  • the system is used to diagnose the different control units.
  • the communication module is used for communication between a control unit and vehicle diagnostics. The data transmission is triggered by the vehicle diagnostics.
  • the diagnostic system is therefore not suitable for event-oriented vehicle diagnosis and is therefore not suitable for onboard diagnosis.
  • DE 44 43 218 discloses a device for storing diagnosis-relevant data in motor vehicles.
  • Control units are designed to be able to communicate with each other as components of the device via a bus and are designed so that they are capable of independently detecting errors and issuing requirements for setting error codes on the data bus.
  • a bus memory module that is capable of communication with the control devices is designed in such a way that it stores data relevant to diagnosis in response to such a request. The data can then be read out for later evaluation.
  • the system does not carry out data reformatting in a data format specified by the diagnostic module. This means that data from the ECU hardware cannot be evaluated independently.
  • no selective data selection of the data delivered by the control units is carried out according to diagnosis relevance.
  • the resources of the data bus are therefore not used efficiently.
  • the system is therefore not suitable for onboard diagnosis.
  • the system diagnosis uses the offboard information from the individual control units, which is not sufficient for future onboard diagnosis.
  • control units and system di Agnosis eg regarding error transmission, setting / resetting the status of errors, interpretation of the specifications requires an interface of the diagnostic modules that is individually adapted to each control unit.
  • the transmission capacity of the transmission protocol on which the networking is based is used inefficiently by the transmission for the diagnosis of unimportant data.
  • the processing of the error setting conditions and the time reference are different. This is caused by the fact that the data transfer from the control units is initiated by the diagnostic process. The control units only transfer their data on request.
  • the invention is based on the object of providing a communication module and method for operating the module which avoid the disadvantages of the prior art and in particular standardize the communication between local applications, in particular control unit applications in control units and a central application, in particular system diagnosis, with onboard diagnosis being possible shall be.
  • the object is achieved by the method and the device according to the independent claims.
  • Particular embodiments are the subject of the dependent claims.
  • the central application is referred to as system diagnostics application and the local applications as control unit applications without restricting generality.
  • the local applications can also be any application that can provide diagnosis-relevant data, for example the outside temperature.
  • the networking of the system and the transmission protocol used for data transmission on this system will also be described below referred to as the transmission medium.
  • the local applications are processes that work within the hardware, for example of control units.
  • the central application is a process that preferably works within the hardware of a diagnostic device.
  • the system diagnostics-relevant data also called process data
  • process data is transferred event-oriented from the control unit application to the communication module when its value changes. This data is managed and processed internally.
  • the data present in the data format of the transfer interface of the control unit applications is reformatted into a format which is predetermined by the diagnostic application and is independent of the control unit application transfer data formats.
  • the process data are preferably converted into the respective transmission format in a defined cycle and transmitted to the system diagnostic application via a standard transmission protocol.
  • the method can be parameterized to the requirements of the target hardware using a configuration process.
  • the internal data management, the transmission format and the transmission protocol are determined during this configuration phase based on the size of the process data relevant to system diagnostics.
  • event-oriented data are made available by the control unit applications for adoption by the communication module according to the invention.
  • Event-oriented data provision means that the data is made available when a predetermined event occurs. The data transfer is therefore initiated by the control units. If a control unit application determines the occurrence of such an event, the corresponding data are transferred to the communication module.
  • the database as to whether an event leads to data transfer is held in the control unit applications.
  • Such events can be external or internal Be kind.
  • the system development process determines which events lead to data transfer. External events can, for example, the occurrence of error states, for example the failure of a brake lamp or the reaching of a threshold value, e.g. B. a certain coolant temperature.
  • the data are then immediately accepted by the communication module in the data format defined by the control unit application interface.
  • the communication module manages the data and prepares the data. Data processing is preferably carried out in two ways:
  • - Coding of the data on a transmission protocol which is the basis of the data transmission on the network between the control devices and the diagnostic device, e.g. a CAN bus or MOST.
  • data compression is also carried out. Any known data compression methods can be used.
  • data formatting the data formatted in accordance with the control unit application interfaces are preferably selected in accordance with a relevance, for example the system diagnosis relevance, which is predefined for an intended central application. Data that are not relevant for this application and are provided by the local applications are no longer processed for data formatting. The relevant data is then rewritten according to the format of the interface of the central application. So there is a transformation tation of the control unit application data in a bit format known for the system diagnosis application. The diagnostic application therefore does not have to know the interface formatting of the individual control unit applications. This information is kept in the communication module. The communication module rearranges the data provided by the control units in accordance with the data format determined by the diagnostic application.
  • the data is therefore available for the diagnostic application in a structure that is independent of the control unit application interfaces. This enables error-free interpretation of process data by the diagnostic application, without the diagnostic application having to be modified when there is a change in control unit interfaces, for example when a defective control unit is replaced by another control unit version or when an control unit application is updated.
  • the data prepared in this way are formatted in accordance with the underlying data transmission protocol for transmission via the network between control devices and diagnostic device.
  • a local pre-diagnosis is also carried out. For this purpose, further diagnosis-relevant data, which supplement the event-oriented data taken over from the local applications, are specifically generated by triggering diagnosis routines in the individual control device applications.
  • the management of the data in the communication module preferably includes data buffering between the data transfer by the communication module and the method step of data transfer to the central application.
  • the data buffering enables the transition from event-oriented data transfer from the control unit applications through the communication module to the time coordination of the data transfer of the processed data to the central application.
  • the data transfer from the communication module to the central application is preferably initiated by the communication module, ie controlled by the communication module.
  • the time for this data transfer can be set by a timer in the communication module or be determined by the transmission medium, the timer is preferably provided by a local application.
  • the data transfer from the communication module to the central application is preferably carried out in a fixed transfer cycle.
  • the transfer cycle is preferably by a timer, i.e. triggered a time cycle generator in a local application, i.e. determined and initiated.
  • the data are preferably only transferred when there is a change in data compared to the previous transfer cycle. This leads to a minimization of the computing power requirement and to an efficient use of the transmission medium which networks the control devices with the diagnostic device.
  • the data is temporarily stored in the communication module.
  • This embodiment is preferably used when the amount of data taken over by the control unit applications exceeds the transfer capacity of the transfer protocol in such a way that not all the data taken over from the local application can be transferred within a transfer cycle between the communication module and the central application.
  • Input and output states e.g. active, inactive
  • the communication module can handle all types of data flexibly. With event-oriented data provision, the system diagnosis-relevant process data are to be transferred to the communication module immediately after changing the values.
  • the data exchange between a central application, e.g. system diagnostics in a motor vehicle and involved local applications, e.g. ECU applications are carried out efficiently, uniformly and independently of the data size of the data to be exchanged. This also applies to the administration, preparation and coding of the data to be sent by the individual local applications.
  • a distributed overall vehicle diagnosis is made possible.
  • the communication module controls the sequence of diagnostic routines, in particular error localization routines in the control unit applications.
  • the diagnostic data determined thereby directly in the control unit are then transmitted from the communication module to the central application.
  • the communication module preferably includes this Embodiment means for controlling the local applications.
  • access to the data in the communication module is made possible by the control unit applications.
  • the communication module can be optimally parameterized to the respective target hardware during a configuration phase.
  • the functionality of the internal data management, data preparation and data coding is determined based on the amount of data to be processed.
  • Several available data coding mechanisms guarantee a high level of information mation density within the network protocol on which the application is based, eg CAN protocol.
  • Special embodiments of the invention enable intelligent variant handling.
  • the configuration phase of the communication module is carried out before using the communication method according to the invention.
  • the configuration of the method is based on known data formats of the control unit applications and the fixed selection of which of the control unit data are relevant for diagnosis.
  • the following adaptations of the communication module to the hardware and software that is to say to control devices, control device applications and physical networking, as well as network protocol of the networked system in which the method according to the invention is used, are preferably carried out:
  • the transmission format for the transmission of data from the local applications to the central application is adapted to the transmission format on which the networking is based.
  • As a selection of the transmission format e.g. can be selected between the data protocol from MOST or CAN.
  • the location of the diagnosis-relevant data is determined within the data format used by the control unit application in the control unit for the data selection during the use of the method.
  • the software and / or hardware version of the control device application or the control devices is determined and the localization of the diagnosis-relevant data within the data format used by the control device application for the data selection during the process use is determined therefrom.
  • a further form of intelligent variant handling enables light consideration of different configurations of the control units within the vehicle.
  • the diagnostic relevance of the data of a control unit application in a control unit can depend, for example, on whether the control unit is used in a vehicle with left-hand or right-hand drive.
  • a uniform interface between the local applications and a central application is created.
  • the communication module according to the method can be freely configured for different local applications.
  • the communication module according to the method is free to use different transmission protocols, e.g. CAN, LIN, MOST configurable.
  • a high density of information during data transmission is guaranteed.
  • the process works regardless of the data type, ie the data type and the amount of data.
  • the transmission system load is minimized by intelligent selection of the data relevant for the diagnosis and made available by the control unit applications.
  • the flexibility of the communication module minimizes the effort of integrating new control units into the networked system and enables the use of existing control units for onboard diagnostics.
  • FIG. 1 shows the basic structure of a communication module according to the invention.
  • FIG. 2 shows an embodiment of the communication module and its preferred location in a networked system.
  • FIG. 4 illustrates the cyclical triggering of the data transfer from the communication module to the central application with an external timer.
  • FIG. 1 shows the structure of a communication module according to the invention. Furthermore, the data flow (1) and the control flow (2) are represented in a communication module according to the invention. The direction of flow is indicated in the drawing by the direction of the arrow. From one Control unit application (3) data is transferred event-oriented to the communication module. Due to the event orientation, the data transfer is initiated and thus the control flow starts from the control unit application. In the special embodiments for distributed diagnosis and / or when data is made available from the communication module for the control device applications, the data flow can also take place from the communication module to the control device application.
  • the data are first checked by means of a sequence control (4) to determine whether their volume is the transmission capacity of the network protocol in a transmission cycle for direct transmission by means of a transmission module (5) to the data transfer interface (7) of the communication module to the diagnostic application (8) Diagnostic device does not exceed. If the data volume exceeds the transmission capacity, the data are forwarded to the data management module (6) for temporary storage. This is controlled by the process control. The data is then distributed over several transmission cycles. The data preparation can be carried out either in the data management module or in the transmission module. In general, the administration and transmission module can also be combined in a single module. The division of administration and mailing is done here only for better illustration. If there is a temporary storage, the data processing is carried out in the data management module.
  • the data is processed in the transmitter module.
  • the transmitter module sends the processed data to the diagnostic module data transfer interface of the communication module. This data transmission is controlled by the transmitter module of the communication module.
  • the elements of the communication module which lie within the hatched area in the figure preferably work within the control units.
  • 2 shows the preferred division of the sub-modules of the communication module onto the hardware of the networked system using the example of a diagnostic system in a motor vehicle.
  • Three control devices (201, 202, 203) are shown, which are connected to a diagnostic device (21) via a CAN bus (20). The flow of data via the CAN bus is illustrated by arrows.
  • a control unit application (211, 212, 213) and a sub-module (221, 222, 223) of the communication module each operate within the control units.
  • These sub-modules contain the data transfer means and the data processing means of the communication module as well as means for sending the processed data from the sub-module in the local applications to the data transfer interface.
  • the processed data are transmitted via the CAN bus to the data transfer interface (7) of the communication module.
  • the data transfer interface works together with the diagnostic application (8) in a diagnostic device (21).
  • the processed data is then encoded according to the transmission protocol of the transmission medium (31), for example a so-called CAN frame is created (40).
  • the data is then sent and transmitted (36) via the transmission medium (35), for example the CAN bus, to the data transfer interface of the communication module and the transfer to the diagnostic application (8).
  • FIG. 4 illustrates the cyclical triggering of the data transfer from the communication module to the central application with an external timer.
  • This timer is preferably provided by a local application.
  • Two data transfer cycles (42) are shown. The cycles are started by triggering the timer (43). Within the cycle time t C y c i, the data provision, which includes the preparation of the data, is carried out in the time t dat . Subsequently, the transmission process takes place over the transmission medium in time t sen d.
  • the input data (51) describing the system hardware and system software are first read in (52).
  • This data includes information about the control units, the control unit software, the hardware of the network and / or the transmission protocol to be used, for example the CAN protocol.
  • data relating to the configuration of the control units and / or data on the device version and / or the control unit software version can be contained.
  • properties such as, for example, B. Type of data specified.
  • a consistency check can be carried out during the reading.
  • the transmission format (53) is now defined. Here it can already be determined whether a separate data memory is required in the communication module.
  • the data for the selection and reformatting of the interface data of the individual local applications is then generated in a parameterization phase (54). riert. Finally, the configuration data generated during the definition of the transmission format and in the parameterization phase are output, for example, in files (55).
  • This output data (56) is used to configure the communication module.
  • the output data include, for example, activation information for the required algorithms, for example with regard to the use of a buffer, information regarding the access options to data of the communication module by the control unit applications, all process data information of the control unit applications and / or further information for data management, data preparation and data transmission ,

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)
  • Debugging And Monitoring (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de communication entre plusieurs applications locales et une application de diagnostic dans un véhicule automobile ainsi qu'un module de communication correspondant. Selon ce procédé, des données sont transmises des applications locales à l'application de diagnostic par l'intermédiaire d'un support de transmission. Ledit procédé comprend l'allocation des données orientée événements par les applications locales, l'acceptation de ces données par un module de communication déclenchée par l'allocation des données orientée événements, la gestion et la préparation des données par ce module de communication et le transfert des données préparées du module de communication à l'application centrale. Selon cette invention, la préparation de toutes les données acceptées par les applications locales, au sein du module de communication, comprend le formatage des données dans un format de données défini par l'application centrale. Ce procédé et ce module de communication conviennent, en particulier, à l'exécution d'un diagnostic embarqué dans des véhicules automobiles.
EP02758253A 2001-08-17 2002-06-20 Procede de communication et module de communication Withdrawn EP1417469A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10140519 2001-08-17
DE10140519A DE10140519B4 (de) 2001-08-17 2001-08-17 Kommunikationsverfahren und Kommunikationsmodul
PCT/EP2002/006834 WO2003016856A2 (fr) 2001-08-17 2002-06-20 Procede de communication et module de communication

Publications (1)

Publication Number Publication Date
EP1417469A2 true EP1417469A2 (fr) 2004-05-12

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Family Applications (1)

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EP02758253A Withdrawn EP1417469A2 (fr) 2001-08-17 2002-06-20 Procede de communication et module de communication

Country Status (5)

Country Link
US (1) US20050015380A1 (fr)
EP (1) EP1417469A2 (fr)
JP (1) JP2005500198A (fr)
DE (1) DE10140519B4 (fr)
WO (1) WO2003016856A2 (fr)

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Also Published As

Publication number Publication date
US20050015380A1 (en) 2005-01-20
JP2005500198A (ja) 2005-01-06
WO2003016856A2 (fr) 2003-02-27
DE10140519B4 (de) 2004-07-22
DE10140519A1 (de) 2003-03-13
WO2003016856A3 (fr) 2004-02-12

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