EP3747164A1 - Système de transmission de données de commande - Google Patents

Système de transmission de données de commande

Info

Publication number
EP3747164A1
EP3747164A1 EP19700368.4A EP19700368A EP3747164A1 EP 3747164 A1 EP3747164 A1 EP 3747164A1 EP 19700368 A EP19700368 A EP 19700368A EP 3747164 A1 EP3747164 A1 EP 3747164A1
Authority
EP
European Patent Office
Prior art keywords
message
field
information
type
slave
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Withdrawn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
EP19700368.4A
Other languages
German (de)
English (en)
Inventor
Michel WETTERAU
Ingo Lippenberger
Andreas Wildbrett
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.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen 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 ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of EP3747164A1 publication Critical patent/EP3747164A1/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Withdrawn legal-status Critical Current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
    • H04L12/403—Bus networks with centralised control, e.g. polling
    • 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
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/22—Parsing or analysis of headers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
    • H04L69/329—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the application layer [OSI layer 7]

Definitions

  • the present invention relates to a transmission system for control data.
  • the invention relates to the flexible transmission of information between different control devices by means of a control bus.
  • control bus On board a motor vehicle, several control units are communicatively networked by means of a control bus.
  • the control bus may allow transmission on the initiative of any controller, or a master may be provided that is the only one who can arbitrate the bus and request a slave to transmit a message of a predetermined type of message.
  • messages to be exchanged on the communication bus are limited in length and subdivided into predetermined fields.
  • One field usually includes an address of a sender or recipient, another may carry an identification of the message type. Both fields are limited in length, so that the number of bus subscribers and / or the number of different message types can also be limited.
  • a control task may be difficult to implement under these constraints. For example, more different message types may be required than are definable with the protocol of the control bus. In this case, it is often necessary to use a more complex control bus that supports a higher bandwidth, a larger number of message types, or larger payload volumes. However, this usually also means changed physical driver components, possibly also other voltage levels, another transmission medium or another data technology procedure. An existing control can usually not be retrofitted with reasonable effort. In addition, in a safety-critical application as in the control of an aspect of a motor vehicle certification of the driver blocks may be required, so that under certain circumstances considerable effort for the change of the control bus must be driven.
  • An object of the present invention is therefore to provide an improved technology in order to be able to solve a data-technically complex or diverse control task by means of a simple control bus.
  • the invention achieves the object by means of the subject matters of the independent claims. Subclaims give preferred embodiments again.
  • a control bus allows the transmission of a message of a predetermined message length.
  • a method of communicating information on the control bus includes steps of transmitting a message comprising a first and a second field; wherein the first field comprises a variable indication of an information type; and wherein the second field comprises information of the information type pointed to by the first field.
  • the hint of the first field can be changed cyclically.
  • the information communicated within the second field may then have a predetermined repetition rate which may be less than the repetition rate of the messages by the cycle length.
  • the message may include a third field that includes information of a fixed predetermined type of information.
  • Information that is to be transmitted frequently can be transmitted in the third field.
  • control parameters of a control device in the third field in each message can be transmitted, while only slowly changing boundary conditions, such as a temperature a controlled object, can be transmitted in the second field.
  • boundary conditions such as a temperature a controlled object
  • the control bus may include a master and at least one slave, wherein the master may request a transmission of a second message of a second message type from the slave by means of a first message to the slave.
  • a bus controlled by the master can be more robust and an arbitration phase can be eliminated or run more easily.
  • the transmission of a message can be better planned especially in terms of time.
  • the first field may be changed cyclically in successive messages by the slave.
  • the method may allow easier processing on the part of the master.
  • the first message may include an indication of a predetermined message type of the cycle.
  • the master may set an index of the cycle. In practice, this possibility can be used to directly query specific information within the cycle.
  • the slave side indexing of the first field can be turned off by setting the index on each request by the master.
  • the message may also include a fourth field indicating one of a plurality of different message types, each message type being associated with a predetermined cycle length.
  • a transmission mode may correspond to an operating state of a terminal (master or slave). For example, at system startup, a first message type may be transmitted, which message type may include a predetermined number of different messages. Each of these messages can be transmitted once. Thus, the system start can be completed and in a normal operation messages of a second message type can be transmitted. Again, cyclically different messages of the second message type can be transmitted one after the other.
  • Information types of the fields of a message may be defined with respect to a message type. In other words, the length of a field of a message in a message type may be constant, but different between different message types.
  • a device for transmitting information on a control bus which allows the transmission of a message of a predetermined message length, includes an interface for connection to the control bus and a control device.
  • the control device is set up to transmit a message comprising a first and a second field; wherein the first field comprises a variable indication of an information type; and wherein the second field comprises information of the information type pointed to by the first field.
  • the device is preferably configured to partially or completely execute or control a method described herein.
  • the method can be present as a computer program product and run on a processing device of the device. Advantages and features of the method can be transferred to the device and vice versa.
  • Fig. 1 is an exemplary drive system
  • Fig. 2 is a schematic representation of exemplary messages for transmission on a control bus
  • FIG. 3 is a flowchart of a method for communicating messages on a control bus.
  • FIG. 1 shows a drive system 100.
  • a drive motor 105 shown here by way of example as an internal combustion engine, acts on a drive shaft 1 15 via a manual transmission 110.
  • the drive system 105 is preferably used for driving a motor vehicle. vehicle, in particular a passenger car, and may comprise a drive wheel on which the drive shaft 115 can act.
  • the manual transmission 110 can be controlled, in particular, by changing an engaged gear ratio. If the manual transmission 110 comprises a converter clutch 120, then parameters such as blade position or activation of a lock-up clutch can be controlled.
  • a first control device 125 is preferably provided. Certain operations within the transmission 110 may be hydraulically controlled, such as opening or closing a clutch or brake.
  • a predetermined fluid pressure of a hydraulic fluid is required, which can be provided by means of a pump 130.
  • oil can be used as the fluid, which can be taken, for example, from a pressure circulation lubrication of the drive motor 105. Oil drained from the controller may then be returned to an oil sump or other location of the drive motor 105.
  • the pump 130 may be driven mechanically by means of the drive motor 105, wherein a fluid pressure may be dependent on the speed of the drive motor 105.
  • the pump 130 may be driven by an electric motor 135.
  • the electric motor 135 can function as a power-split auxiliary drive of the pump 130 in addition to the drive motor 105, or the pump 130 can only allow a single drive, so that the electric motor 135 can alternatively act on the pump 130 by the drive motor 105.
  • the electric motor 135 may be controlled by means of a control device 140, which in the illustrated embodiment comprises a bridge circuit 145 and a determination device 150 for determining voltages or currents to be set.
  • the bridge circuit 145 may be constructed differently.
  • the electric motor 130 is designed as a brushless DC motor (BLDC) with more preferably three phases.
  • the bridge circuit 145 may provide three independent voltages to the phases. For this purpose, each phase is connected by means of two flow valves. see the potentials of a DC link voltage interconnected. The flow control valves are alternately opened and closed so that a predetermined voltage is established at the inductive load of the phase.
  • the determination device 150 preferably operates by means of field-oriented control (FOS) or field-oriented control (FOR), in which preferably speed and / or torque of the electric motor 135 can be predetermined.
  • the determination device 150 may be connected to a further control device 160 by means of an interface 155.
  • the control device 160 can be set up to control any, even several aspects of the drive system 100.
  • a control bus 165 is preferably provided, to which the control device 125 of the transmission 1 10 may be connected.
  • one or more further control devices may be connected to the control bus 165, for example a control device 170 for controlling the drive motor 105.
  • the control device 160 is still connected to a further control bus, such as a CAN bus, the control device 160 between the two buses Can transmit data (in the function of a "bridge").
  • the control bus 165 is preferably designed as a field bus with a master and one or more slaves.
  • the control bus is embodied as a LIN bus (LIN: Local Interconnect Network), wherein the control device 160 is preferably configured as a master.
  • LIN Local Interconnect Network
  • other control buses are also possible, for example a CAN bus (CAN: Controller Area Network). It is preferably a serial bus, which in the case of the LIN bus can manage with one wire, in the case of the CAN bus with two wires as the physical transmission medium.
  • the amount of information to be exchanged between the control device 160 and the control device 140 of the electric motor 130 may be large. In particular, a large number of different data may have to be transported via the control bus 165 in different operating states of the drive system 100.
  • the master may be configured to send a slave over the control address bus 165 and request it to return a predetermined message.
  • the slave usually responds directly to the requested message, which may include multiple predetermined fields.
  • a restriction on the length of a corresponding field only a limited number of messages can be defined. The more different information to be transmitted, the more messages must be defined.
  • transmission of less-than-required information can jeopardize the frequency of transmission of more critical information.
  • FIG. 2 shows in an upper area a message 205 which can be transmitted on a control bus 165 and in a lower area three different, exemplary sequences of messages 205 on the control bus 165.
  • the message 205 comprises a first field 210 and a second field 215 to allow multiplexing of information.
  • the second field 215 may contain different information, the information type of which is indicated in each case by a predetermined reference in the first field 210.
  • the indication in the first field 210 can be given in particular as an index, for example in the form of a number, preferably in binary form. For example, for the first field 12, different types of information may be specified for which 12 different indexes may be represented as binary coded numbers in the first field 210 of length 4 bits (or longer).
  • the first field 210 may carry approximately the index 1 if the second field 215 contains a measured temperature, or the index 2 if the second field 215 contains an error code.
  • An optional third field 220 may include further information whose information type is constant at least within a message type 230-240.
  • the third field 220 can also be subdivided internally, so that different information can be transmitted in each case of unchangeable information types.
  • a control parameter such as an internally determined setpoint speed or an actual speed of the electric motor 135 are transmitted.
  • An optional fourth field 225 may indicate the message type of the message 205.
  • the length of the fourth field 225 is preferably constant across all message types and is always at the same location relative to the beginning of the message 205. If the messages 205 of different message types have different lengths, it is further preferred that the fourth field 225 be before a variable Field of the message 205 is arranged. In particular, the fourth field 225 may be at the beginning of the message 205.
  • Different message types may be assigned different lengths of fields of the message 205.
  • the messages 205 of different message types preferably have the same length, but may also have different lengths.
  • a predetermined type of information type of the second field 215 may be associated with a message type.
  • Each type of information is preferably assigned an index, so that from indices arranged in strictly monotonic order (ascending or descending) results in a predetermined sequence of information types. The sequence can in particular be cycled.
  • a predetermined portion of a message 205 (preferably the last byte within a message 205) carries a checksum (CRC) over the remaining transmitted information. This preferably applies to all messages 205 which are transmitted in any direction between the master 160 and the slave 155.
  • the checksum may be considered as a separate static field or as part of the fourth field 225.
  • a transmission of messages 205 on the control bus 165 is preferably such that the master 160 sends a predetermined message 205 to a predetermined slave 165, the message 205 contains a request to provide a predetermined message 205, and the slave 155 responds with a Message 205 with the information sought.
  • Each message 205 of the slave ve 155 to the master 160 thus requires an explicit preceding message 205 by the master 160.
  • control bus 165 is a LIN bus in which the master 160 for response of a slave 155 provides the header of a message frame on the control bus 265 and the slave 155 then transmits data requested to you.
  • the request of the master 160 preferably has the same length as a response message 205 of the slave 155, in the present case preferably eight bytes in addition to the header, which corresponds to the maximum of the LIN specification.
  • Message 205 in the illustrated embodiment, includes a CRC8 checksum in the last byte.
  • a request message 205 from the master 160 to the slave 155 can have its own message type and can do without the first two fields 210 and 215.
  • Information from the static third field 220 may include, for example, a desired speed of the electric motor 135, an oil temperature of the drive motor 105, or an estimated torque of the electric motor 135.
  • Other bits may include the index of an information type of a message to be returned 205. For additional functions, a predetermined number of bits may be provided. Further, 205 bits may be reserved for later use at different locations of the message. Individual bits may also be used for special functions, such as an error reset bit or a bit to indicate whether the motor 135 should run clockwise or counterclockwise.
  • an access counter may be provided which contains cyclically incremented values via the individual messages 205.
  • a first message 205 from the master 160 to the slave 155 of a second message 205 from the slave 155 to the master 160 can be assigned.
  • a message 205 lost during transmission or transmitted several times can thus be noticed.
  • FIG. 1 In the lower area of FIG. 2, three different message types 230, 235 and 240 with corresponding sequences of information types in the respective second fields 215 are shown by way of example. Exemplary indices of the individual information mation types of the illustrated message types 230 to 240 are shown in FIG.
  • the illustration of FIG. 1 is based on a standard message type 230, an identification message type 235 and a development message type 240.
  • the standard message type 230 is usually transmitted at fixed intervals as long as the control device, the electric motor 135 or the drive system 100 is in operation. Information of the information types shown can be transmitted cyclically from the slave 155 to the master 160.
  • a message 205 can be transmitted within about 10 ms, so in the above example between the transmission of the phase current of the phase U and the transmission of the phase current of the phase V because of the respectively required request messages 205 by the master 160th can be about 40 ms.
  • pairs of phase currents and time-corresponding intermediate circuit voltages are transmitted.
  • the identification message type 235 for example, the following types of information may be provided:
  • the identification message type 235 may be used, for example, when the controller 140 is being initialized, such as when starting a motor vehicle with the drive system 100. Identifications of various components of the drive system 100 or a surrounding motor vehicle may be exchanged to ensure proper operation thereafter , Typically, the identification message type 235 is transmitted only once per start of the drive motor 105 on the control bus 165.
  • development message type 240 for example, the following types of information may be provided:
  • the development message type 240 may transmit certain information more frequently or less frequently than the standard message type 230; In addition, additional values can be transmitted. As part of a development of components of the drive system 100, in particular the pump 130, the electric motor 135, the control device 140 or the control device 160, or even for more accurate diagnosis, such as in a workshop, for example, for troubleshooting, the development message type 240 can be advantageous be used.
  • Additional message types can be provided, for example, for the transmission of error states or for switching off the electric motor 135 or the control device 140.
  • all slaves 155 are switched off if no message of the master 160 on the control bus 165 occurs over a predetermined time, for example about 4 seconds.
  • the third field 220 of messages 205 of the message types 230 to 240 can always be assigned the same and comprise, for example, a setpoint speed, an actual speed of the electric motor 135, the above-described access counter or an index of the information type transmitted in the second field 215. Furthermore, a specific direction of rotation of the electric motor 135, an error indicator, an indicator about a completed initialization of the control device 140, an indicator of a communication error, a temporary error, a permanent error or an indicator of a warning of an endangered data security be provided. Remaining bits may be reserved for later use.
  • FIG. 3 shows a flow chart of an exemplary method 300 for transmitting messages 105 on a control bus 165.
  • the method 300 is preferably executed in interaction between the master 160 and the slave 155.
  • the left-hand master and the left-right slave 155 are arranged on the right, and the illustrated steps each relate to a transmission of a message 205 from one to the other party, as shown by the arrows.
  • the master 160 transmits a first message 205 to the slave 155, which includes a request for the return transmission of a second message 205. It is also possible to specify a predetermined message type 230 to 240 to which the answer should correspond.
  • the first message 205 may include an index to which the value of the first field 210 of the requested second message 205 is to be set. If such a default is not made, the slave 155 may start from a fixed index in response to it or may itself determine a matching index.
  • the slave 155 responds to the master 160 with the requested second message 105.
  • the fourth message type field 225 is preferably set to the value of the fourth field 225 of the received first message 205 to indicate the type of message being used.
  • the first field 210 contains an index indicating which type of information the information in the second field 215 has.
  • a predetermined index may be provided for the first field 210 of the response or the slave 155 may determine the index itself, in particular by incrementing a corresponding counter. If its value exceeds the number of defined information types of the message type 230 to 240, then the slave 155 can reset the index appropriately so that a cyclical transmission of information of all agreed information types can take place via the messages sent 205. Exemplary sequences of response messages 205 in sequential indexing are described in greater detail above with reference to FIG. A corresponding message 205 is transmitted by the slave 155 to the master 160 in a step 320.
  • Such a sequence may be repeated as often as desired to continuously communicate information between the master 160 and the slave 155 in both directions.
  • the information of the fourth field 225 can be transmitted at a predetermined high frequency.
  • the frequency of the information transmitted from the master 160 to the slave 155 is the same.
  • the defined fields are transmitted from the slave 155 to the master 160 with a correspondingly lower frequency.
  • the master 160 may change the order of transmitted information types at any time, thus requesting information of particular types of information more frequently or earlier.
  • first message type (default) second message type (identification) third message type (development) method

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Health & Medical Sciences (AREA)
  • Computing Systems (AREA)
  • General Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Small-Scale Networks (AREA)

Abstract

L'invention concerne un bus de commande (165) permettant la transmission d'un message (205) présentant une longueur de message prédéfinie. L'invention concerne également un procédé (300) servant à la transmission d'informations sur le bus de commande (165), comprenant une étape consistant à transmettre un message (205) qui présente une première (210) et une seconde zone (215) ; la première zone (210) comprenant une indication variable sur un type d'information ; et la seconde zone (215) comprenant une information concernant le type d'information qu'indique la première zone (210).
EP19700368.4A 2018-01-31 2019-01-10 Système de transmission de données de commande Withdrawn EP3747164A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018201433.7A DE102018201433A1 (de) 2018-01-31 2018-01-31 Übertragungssystem für Steuerdaten
PCT/EP2019/050490 WO2019149488A1 (fr) 2018-01-31 2019-01-10 Système de transmission de données de commande

Publications (1)

Publication Number Publication Date
EP3747164A1 true EP3747164A1 (fr) 2020-12-09

Family

ID=65013702

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19700368.4A Withdrawn EP3747164A1 (fr) 2018-01-31 2019-01-10 Système de transmission de données de commande

Country Status (5)

Country Link
US (1) US11424956B2 (fr)
EP (1) EP3747164A1 (fr)
CN (1) CN111656738B (fr)
DE (1) DE102018201433A1 (fr)
WO (1) WO2019149488A1 (fr)

Families Citing this family (2)

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Publication number Priority date Publication date Assignee Title
IT201800003980A1 (it) * 2018-03-26 2019-09-26 Stmicroelectronics Application Gmbh Procedimento di comunicazione, sistema, dispositivi, segnale e veicolo corrispondenti
CN113347115B (zh) * 2021-08-06 2021-11-26 北京国科天迅科技有限公司 消息处理方法、装置、电子设备及介质

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ITMI20010148A1 (it) * 2001-01-29 2002-07-29 Siemens Inf & Comm Networks Metodo per la trasmissione delle autorizzazioni ad impegnare il canale in sistemi punto multipunto con differenti modi fisici
DE102006014453A1 (de) * 2006-03-29 2007-10-04 Volkswagen Ag Eingebettetes System und Verfahren zum Betreiben eines eingebetteten Systems mit verbesserter Kennzeichnung von fehlerhaften ausgetauschten Signalen
DE102007043769B4 (de) 2007-09-13 2016-09-01 Sew-Eurodrive Gmbh & Co Kg Gerät, Verfahren zur Adressierung, Umrichter und Verfahren zur sicheren Datenübertragung
ES2548409T3 (es) * 2011-06-29 2015-10-16 Robert Bosch Gmbh Método y dispositivo para la transmisión en serie de datos con un tamaño flexible de mensajes y una longitud de bits variable
JP5770935B2 (ja) * 2011-06-29 2015-08-26 ローベルト ボッシュ ゲゼルシャフト ミット ベシュレンクテル ハフツング メッセージの大きさがフレキシブルでビット長が可変的な直列データ伝送のための方法及び装置
US8819170B2 (en) * 2011-07-14 2014-08-26 Schneider Electric It Corporation Communication protocols
JP2014085803A (ja) 2012-10-23 2014-05-12 Omron Corp 通信装置
JP6390113B2 (ja) * 2014-02-14 2018-09-19 オムロン株式会社 制御システム、開発支援装置、制御装置、および制御方法
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CN105704028B (zh) * 2016-03-25 2019-02-19 北京华为数字技术有限公司 报文处理方法及装置
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US11026172B2 (en) * 2018-01-04 2021-06-01 Qualcomm Incorporated Implementing wake-up radio (WUR) device communications

Also Published As

Publication number Publication date
US20210044448A1 (en) 2021-02-11
WO2019149488A1 (fr) 2019-08-08
US11424956B2 (en) 2022-08-23
DE102018201433A1 (de) 2019-08-14
CN111656738B (zh) 2022-08-16
CN111656738A (zh) 2020-09-11

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