EP1864443A1 - Procede et dispositif pour transmettre des donnees sur une ligne de donnees entre un appareil de commande et un appareil de traitement de donnees decentralise - Google Patents

Procede et dispositif pour transmettre des donnees sur une ligne de donnees entre un appareil de commande et un appareil de traitement de donnees decentralise

Info

Publication number
EP1864443A1
EP1864443A1 EP06725456A EP06725456A EP1864443A1 EP 1864443 A1 EP1864443 A1 EP 1864443A1 EP 06725456 A EP06725456 A EP 06725456A EP 06725456 A EP06725456 A EP 06725456A EP 1864443 A1 EP1864443 A1 EP 1864443A1
Authority
EP
European Patent Office
Prior art keywords
data
data processing
processing device
central control
decentralized
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Withdrawn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
EP06725456A
Other languages
German (de)
English (en)
Inventor
Wolfgang Gottswinter
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.)
Continental Automotive GmbH
Original Assignee
Siemens VDO Automotive AG
VDO Automotive 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 Siemens VDO Automotive AG, VDO Automotive AG filed Critical Siemens VDO Automotive AG
Publication of EP1864443A1 publication Critical patent/EP1864443A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals
    • H04L7/06—Speed or phase control by synchronisation signals the synchronisation signals differing from the information signals in amplitude, polarity or frequency or length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/013—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
    • B60R21/0132—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over responsive to vehicle motion parameters, e.g. to vehicle longitudinal or transversal deceleration or speed value
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R2021/0104—Communication circuits for data transmission
    • B60R2021/01047—Architecture
    • B60R2021/01054—Bus
    • B60R2021/01068—Bus between different sensors and airbag control unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R2021/0104—Communication circuits for data transmission
    • B60R2021/01102—Transmission method
    • B60R2021/01115—Transmission method specific data frames

Definitions

  • the invention relates to a method and an arrangement for transmitting data on a data line between a central control device and a decentralized data processing device.
  • An arrangement of the above type is used for example in the field of occupant protection in motor vehicles.
  • a centrally angeord ⁇ designated central control unit of an occupant protection system which is also known as Electronic Control Unit (ECU).
  • ECU Electronic Control Unit
  • the decentralized data processing device which is also referred to as Satel ⁇ lit, it is a connected to the central control unit decentralized sensor unit.
  • a solvent used in an occupant protection system data processing device typically includes a sensor device, egg nen A / D converter, and means connected to this proces ⁇ processing unit.
  • the sensor signal emitted by the sensor device is converted by the A / D converter and fed to the processing unit, which performs filtering and transmission. tion of the sensor measured values with a linear transmission curve via the data line to the central control unit makes.
  • the sensor device By the sensor device, a relatively large acceleration range is detected, the resolution accuracy for the evaluation by the central control device from the over ⁇ tragungschalumble the data line depends.
  • the transmission data width when transmitting over the data line is relatively low, which is typically 7 bits.
  • Typical sensor devices are at an acceleration range of 4; 40 g, + _ 125 g or + _ 250 g designed, the resolution accuracy decreases with the same transmission ⁇ data width with increasing acceleration range.
  • a method and a device for transmitting data on a data line between a control device and a decentralized data processing device are known from DE 196 09 290 A1.
  • a sensor module for use in a motor vehicle is described, which is connected via a data line to a central control unit.
  • the Sensormo ⁇ dul includes an acceleration-sensitive sensor and Ü periodically every 500 berstofft microseconds a once it has detected a synchronization voltage pulse generated by the central control unit on the data line of the sensor measured values of the sensor processed coded data packet strommodu ⁇ lines to the control unit.
  • the sensor module is connected via a two-wire line to an interface of the control unit.
  • the communication between the control unit and the sensor module is carried out bi ⁇ directional, whereby both a signal transmission as also allows reversed from a sensor module to the control unit. This allows a configuration of the sensor module at Completion of the vehicle, during their first commissioning or after an accidental repair by driving the sensor module via the control unit.
  • the communication between the control unit and the Sensormo ⁇ dul is effected according to a first proposal, by lowering a voltage value on the data line between the control unit and the sensor module by a first higher value to a lower value.
  • the voltage reduction takes place at a time T 1 and continues until a time T 2. At this time T2, the voltage is raised from the lowered value back to the original value.
  • Such voltage control can be repeated cyclically.
  • the duration of the voltage reduction can be detected by the sensor module, based on the temporal
  • the communication according to a second proposal submit is multi-voltage fluctuation control signal, which contains, in co dierter ⁇ shape information for the sensor module.
  • a processing unit of the decentralized data processing device input data of the decentralized data processing device are supplied in egg ⁇ ner first resolution.
  • the data processing unit receives a transformation of the input data according to a calculation specification and transmits the transformed Since ⁇ th through the data line to the central control device in egg ⁇ ner second resolution.
  • the central control device determines according to which calculation rule of a plurality of calculation instructions the decentralized data processing device is to carry out the transformation.
  • the transformation of the input data from the first to the second resolution does not necessarily have to be done in a linear manner. Rather, the calculation rule can be designed such that a non-linear transformation takes place.
  • the transformation can thereby and / or quadra ⁇ table and / or the course of follow tion any Um sacredsfunk- sections different linear.
  • the invention is based on the finding that when the acceleration values are detected by the data processing device, the critical acceleration range is in a low g range.
  • the risk of misjudgments by the controller, and in particular the risk of false triggering of an occupant protection system is particularly high the sensor readings may either originate by an impact of an actual collision object, whereby for example a Auslö ⁇ solution of an occupant protection system would be required, or are caused by a different type of collision object Kgs ⁇ NEN, which do not make the triggering of a protection system necessary.
  • the central control unit it is therefore helpful to provide the central control unit with data that has a high resolution in the low g range.
  • the resolution of the data supplied to the central control unit may be coarser.
  • the invention therefore proposes not only, but in particular the areas particularly relevant to the evaluation to be carried out by the control device in the data processing device to undergo geeig ⁇ Neten transformation and not, or to transform the less relevant areas differently.
  • the information about the transformation (s) are in one Calculation rule deposited, which makes the appropriate Trans ⁇ formation (s).
  • the calculation rule is variable, being set by the central control device, which calculation ⁇ prescribed by the data processing unit are used for transformers ⁇ tion must.
  • the central control device carries out an inverse transformation of the genes are received, ⁇ data using the cited by the decentralized data processing device to transform calculation rule.
  • the "changes" to the data caused by the data processing device can be taken into account by the central control unit.
  • a plurality of calculation rules are stored together with respective calculation rule identifiers in the decentralized data processing device.
  • a calculation rule identifier is transmitted from the central control unit to the decentralized data processing device.
  • the calculation rules contain characteristics about the conversion of the first resolution into the second resolution.
  • the characteristic curves can have sections with different resolutions.
  • the calculation rule specified by the central control unit in the context of the configuration takes place as a function of the data to be determined by the decentralized data processing device and the ambient conditions to which the decentralized data processing device is exposed.
  • the data to be determined are preferably acceleration values, the detection of the data being dependent on the location of the data processing device, e.g. in a motor vehicle.
  • Data processing device is configured during its initialization by the central control unit with respect to the Be ⁇ billing rule to be used.
  • the initialization is performed, for example, every time the device is turned on, whereby the configuration can be made in any suitable manner at every initialization by the controller.
  • This approach also has the advantage that when replacing a defective data processing device by a data processing device of identical design no further precautions regarding its programming or configuration must be made because the configuration is made automatically and completely with each turn on the device when going through an initialization routine.
  • the central control unit for requesting data packets periodically sends synchronization pulses to the computer via the data line at least one data processing device and the decentralized data processing device sends its pending for transfer ⁇ data as a data packet to the central control unit after the synchronization pulse, wherein the configuration of the decentralized data processing device, a communication from the central control unit to the decentralized data processing device he follows ⁇ and as information carrier , the synchronization pulses be used.
  • bidirectional communication takes place between the control device and the data processing device.
  • the use of the Synchroni ⁇ sationspulse as information carriers and their evaluation by the data processing device saves the provision of special circuits which transmit in the central control device. It is merely necessary to provide a unit which causes a synchronization pulse generator corresponding to the configuration information to be coded to generate synchronization pulses or not. The period and the pulse-pause ratio of the synchronization pulses can be selected according to the later ⁇ ren normal operation.
  • the decentralized data processing device is preferably a sensor unit and the data packets transmitted by the latter to the central control unit include sensor measured values.
  • the Syn ⁇ chronisationspuls is output as a voltage pulse, currency ⁇ rend the data packets of the decentralized data processing device are sent as current pulses.
  • the inventive arrangement has the same advantages as have been written above in connection with the method be ⁇ , and is characterized in that this for the operation of a method, as described above, can be used.
  • FIG. 1 shows the schematic structure of an arrangement for transmitting data on a data line between a central control device and a decentralized data processing device
  • FIGS. 2 to 4 show examples of different transfer characteristics for influencing the resolution of the data to be transmitted to the control unit
  • Fig. 5 shows a further schematic structure of an arrangement, based on the problem in the transmission of data will be apparent.
  • FIG. 5 shows a sensor arrangement 1 with a central one
  • Control unit 10 which is connected via a data line 12 to a decentralized data processing device 11.
  • the data processing device 11 comprises a sensor device 13, which supplies the sensor measured values determined by it to an A / D converter 14. After analog-to-digital conversion of the sensor measured values to a processing unit 15 are supplied, which performs Fil ⁇ esterification and the data with a predetermined transmission curve via an interface and the data line 12 transmits to the central control device 10th
  • the signal resolution with which the data can be transmitted to the central control unit is composed here of the resolution of the sensor device, the resolution of the A / D converter and the transmission data width of the data line 12.
  • the signal resolution is calculated according to the formula
  • the sensor device 13 is a 125 g acceleration sensor with a resolution of 18 mV / g.
  • the A / D converter 14 is designed as a 5 VA / D converter with a data width of 10 bits and the data width of the data line 12 is 7 bits, the result is a resolution of 3.69 dig / g in the transmission according to the above formula the data from the A / D converter 14 to the processing unit 15, while the resolution during the transmission over the data line 12 is only 0.46 dig / g.
  • the resolution may be too low, while it is much too large for another area in one area.
  • the invention proposes a variable transmission characteristic of the data transmitted via the data line 12.
  • the data processing device 11 has, as shown in FIG. 1, a plurality of calculation specifications BV1, BV2,..., BVn (hereafter BVi), each of which has a calculation specification identifier BVID1, BVID2,. BVIDn (hereinafter BVIDi).
  • the calculation rules BVi contain a
  • Characteristic characteristic for a transmission of data via the data line During the initialization of the data processing device 11 by the central control unit 10, one of these calculation instructions for influencing the later data transmission can be selected.
  • Be ⁇ billing rules are for this purpose in a memory 16 of the data processing device 11 and are also included in a memory 17 for a later inverse transformation of the transformed data in the central controller 10. Which of the stored in a data processing device 11 cheri ⁇ cherten calculation rules for the transformation of the first resolution in a second resolution by the control unit ge ⁇ is dependent on the installation location and the application of the data processing device.
  • Figure 2 shows a first embodiment of a calculation ⁇ voltage regulation in the form of a linear characteristic in the Ü over the entire acceleration range from -120 to +120 g a second resolution of 0.525 dig / g is present.
  • the proces ⁇ processing unit 15 calculates the case their solution supplied in a first resolu ⁇ data in the second resolution, and transmits the transformed data to the controller.
  • the resolution for the region I is 0.8 dig / g, which applies to the detection of acceleration values in the range of -60 g to +60 g.
  • the measured values determined by the sensor device are / g gen with a resolution of 0.25 dig in the central control device übertra ⁇ .
  • accelerations in the lower g-range are transmitted with a very high resolution to the central control unit via the data line 12, whereby this can make an improved decision regarding the triggering of a protection system.
  • range II transmits the sensor readings with a small resolution, since it is possible in principle assumed there from an impact can be discharged so that an appropriate triggering signal from the central control unit to a Schutzsys ⁇ tem.
  • the sections of the characteristic need not necessarily be linear, but they may be e.g. also square. In principle, every course of a characteristic that can be stored in a calculation rule is conceivable.
  • the configuration of the data processing devices 11 can be carried out using the previously used components (control device and data processing device).
  • the Configu ⁇ ration which preferably takes place in an initialization phase, the arrangement can be carried out using software.
  • the configuration can be flexibly selected for a desired application. In particular, the replacement of defective data processing devices is simplified because they are reconfigured with each initialization by the control unit. In principle, there is also the possibility to change the configuration during operation of the on ⁇ properly.
  • the configuration of the data processing device is carried out using the output in normal operation of the central control unit synchronization pulses.
  • ⁇ approximately the presence or absence of the synchronization pulses are evaluated periodically transmitted by the data processing unit to select based on which the desired calculation rule or Kennlinien characteris ⁇ tik.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Air Bags (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

L'invention concerne un procédé permettant de transmettre des données sur une ligne de données (12) entre un appareil de commande central (10) et un appareil de traitement de données décentralisé (11). Selon ce procédé, des données d'entrée du premier appareil de traitement de données décentralisé (11) sont acheminées, dans une première résolution, jusqu'à une unité de traitement (15) de l'appareil de traitement de données décentralisé (11). L'unité de traitement de données (15) effectue une transformation des données d'entrée, conformément à une prescription de calcul (BVi) et transmet les données transformées au dispositif de commande central (10), par l'intermédiaire de la ligne de données (12), dans une seconde résolution. Le dispositif de commande central (10) détermine, dans le cadre d'une configuration de l'appareil de traitement de données décentralisé (11), selon quelle prescription de calcul (BVi), parmi une pluralité de prescriptions de calcul, l'appareil de traitement de données décentralisé (11) doit effectuer la transformation.
EP06725456A 2005-03-31 2006-03-31 Procede et dispositif pour transmettre des donnees sur une ligne de donnees entre un appareil de commande et un appareil de traitement de donnees decentralise Withdrawn EP1864443A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005014782A DE102005014782A1 (de) 2005-03-31 2005-03-31 Verfahren und Vorrichtung zum Übertragen von Daten auf einer Datenleitung zwischen einem Steuergerät und einem dezentralen Datenverarbeitungsgerät
PCT/EP2006/061208 WO2006103282A1 (fr) 2005-03-31 2006-03-31 Procede et dispositif pour transmettre des donnees sur une ligne de donnees entre un appareil de commande et un appareil de traitement de donnees decentralise

Publications (1)

Publication Number Publication Date
EP1864443A1 true EP1864443A1 (fr) 2007-12-12

Family

ID=36587404

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06725456A Withdrawn EP1864443A1 (fr) 2005-03-31 2006-03-31 Procede et dispositif pour transmettre des donnees sur une ligne de donnees entre un appareil de commande et un appareil de traitement de donnees decentralise

Country Status (6)

Country Link
US (1) US20080195763A1 (fr)
EP (1) EP1864443A1 (fr)
KR (1) KR20070119059A (fr)
CN (1) CN101164296A (fr)
DE (1) DE102005014782A1 (fr)
WO (1) WO2006103282A1 (fr)

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Also Published As

Publication number Publication date
KR20070119059A (ko) 2007-12-18
CN101164296A (zh) 2008-04-16
WO2006103282A1 (fr) 2006-10-05
US20080195763A1 (en) 2008-08-14
DE102005014782A1 (de) 2006-10-05

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