WO2020109313A1 - Station participante pour un système de bus série et procédé de transmission d'un message dans un système de bus série - Google Patents

Station participante pour un système de bus série et procédé de transmission d'un message dans un système de bus série Download PDF

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Publication number
WO2020109313A1
WO2020109313A1 PCT/EP2019/082600 EP2019082600W WO2020109313A1 WO 2020109313 A1 WO2020109313 A1 WO 2020109313A1 EP 2019082600 W EP2019082600 W EP 2019082600W WO 2020109313 A1 WO2020109313 A1 WO 2020109313A1
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WIPO (PCT)
Prior art keywords
domain
subscriber station
bus
message
bus system
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Application number
PCT/EP2019/082600
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German (de)
English (en)
Inventor
Steffen Walker
Arthur Mutter
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.)
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Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2020109313A1 publication Critical patent/WO2020109313A1/fr

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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
    • H04L12/40006—Architecture of a communication node
    • 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
    • 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]
    • H04L12/46—Interconnection of 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]
    • H04L12/46—Interconnection of networks
    • H04L12/4604—LAN interconnection over a backbone network, e.g. Internet, Frame Relay
    • H04L12/462—LAN interconnection over a bridge based backbone
    • H04L12/4625—Single bridge functionality, e.g. connection of two networks over a single bridge
    • 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
    • H04L2012/40215—Controller Area Network CAN

Definitions

  • Subscriber stations for a serial bus system and method for transmitting a message in a serial bus system are Subscriber stations for a serial bus system and method for transmitting a message in a serial bus system
  • the present invention relates to subscriber stations for a serial
  • Bus system and a method for transmitting a message in a serial bus system which also works with a large number of subscriber stations with a high data rate and great robustness against errors, the serial bus system having at least two domains.
  • a bus system is frequently used for communication between sensors and control devices, for example in vehicles, in which data is transmitted as messages in the ISO11898-l: 2015 standard as a Classical CAN protocol specification with CAN FD.
  • the messages are transmitted between the bus participants in the bus system, such as sensors, control units, transmitters, etc.
  • this increases the number of participants that have to be integrated into a bus system.
  • the data should still be in the bus system can be transmitted faster from the sender to the receiver than before. The consequence of this is that the required bandwidth of the bus system continues to increase.
  • CAN FD frames Messages are also referred to below as CAN FD frames or CAN FD messages.
  • CAN FD the user data length is extended from 8 to up to 64 bytes and the data transfer rates are significantly higher than with Classical CAN.
  • subscriber stations for a serial bus system and a method for transmitting a message in a serial bus system are to be provided, in which even when the number of
  • Subscriber station of the bus system with high error robustness a high data rate and an increase in the amount of user data per frame can be realized.
  • the object is achieved by a domain connection subscriber station for a serial bus system with the features of claim 1.
  • Subscriber station comprises a communication control device for controlling a communication of the subscriber station with at least one other subscriber station of the bus system, and
  • transceiver which has a first transceiver for sending messages on a bus of a first domain of the bus system and / or receiving messages from the bus of the first domain, and a second transceiver for transmission of messages on a bus of a second domain of the bus system and / or for receiving messages from the bus of the second domain, the communication control device being configured in one for one
  • Communication control device is configured to send the message to the first transmitting / receiving unit or the second transmitting / receiving unit depending on an evaluation result of the at least one domain ID field.
  • the subscriber station described contributes to the fact that subscriber stations of several bus system domains can communicate with one another.
  • the individual subscriber stations of the different bus system domains can be reliably assigned.
  • the format used to transmit the user data significantly increases the bit rate and thus the transmission speed from the transmitter to the receiver. Due to the design of the transmitting / receiving device of the subscriber station, error frames are no longer required, but error frames can still be used if desired. This contributes to the fact that a sending CAN subscriber station itself has all bus states in the data phase
  • Net data rate to at least 10 Mbps.
  • the size of the user data can be up to 4096 bytes per frame.
  • the method carried out by the subscriber station can also be used if at least one Classical CAN subscriber station that can send messages according to the Classical CAN protocol and / or at least one CAN FD subscriber station is present in the bus system, the messages according to CAN FD protocol can send.
  • the communication control device is designed to evaluate the domain ID field in a received message in order to determine the domain for which the message is intended.
  • the domain ID field can be arranged at the beginning and / or at the end of a data field in a frame received for the message.
  • the communication control device is designed to evaluate a domain ID field in a frame received for the message in order to determine whether a domain should be decoupled from the domain connection subscriber station after the message has been sent.
  • Communication control device a first controller for controlling communication with at least one other subscriber station of the first domain, and a second controller for controlling communication of the subscriber station with at least one other subscriber station of the second domain, the first controller with the first transmitting / receiving unit is connected, the second controller being connected to the second transceiver unit, and the first and second controllers being connected to one another for bidirectional exchange of user data for the first and second domains.
  • the communication control device is configured, a message using a first and a second
  • Communication control device be configured to create the message such that bits in the first communication phase have a bit time that is at least a factor of 10 greater than a bit time of bits that are driven in the second communication phase.
  • the aforementioned object is also achieved by a domain connection subscriber station for a serial bus system with the features of claim 8.
  • the subscriber station comprises a communication control device for controlling communication of the subscriber station with at least one other subscriber station of the bus system, which can be a domain connection subscriber station according to one of the preceding claims, which connects at least two domains of the bus system with one another, the communication control device of the present subscriber station and the communication control device the domain connection subscriber station are configured to arrange at least one domain ID field of the message in a data field, the at least one domain ID field
  • the previously described subscriber stations can be part of a bus system which has a first domain, to whose bus the at least one of the previously described domain connection subscriber station and at least one previously described other subscriber station is connected, which has a second domain, to whose bus the at least one other subscriber station described above is connected, and which additionally has a connecting line for connecting the domain connection subscriber station to the bus of the second domain, so that the at least one subscriber station of the first domain and the at least one a subscriber station of the second domain are connected to one another in such a way that they can communicate with one another in series.
  • the aforementioned object is also achieved by a method for transmitting a message in a serial bus system according to claim 10.
  • the bus system has at least two domains, the method being carried out by a subscriber station which connects the at least two domains and which has a communication control device and a transceiver which has a first transceiver unit and a second transceiver unit, and the method comprising the steps of evaluating, with the communication control device, in a frame received for the message, at least one domain ID field, from which it is determined what type of communication is to be carried out with the first domain and a second domain of the bus system , Taxes, with the
  • Communication control device a communication of the subscriber station with at least one other subscriber station of the bus system
  • Evaluation result of the at least one domain ID field is sent to the first transmitting / receiving unit or the second transmitting / receiving unit, the first transmitting / receiving unit sending messages on a bus of the first domain and / or messages from the bus of the first domain receives, and wherein the second transceiver sends messages on a bus of the second domain and / or messages from the bus of the second
  • FIG. 1 shows a simplified block diagram of a bus system according to a first exemplary embodiment
  • Fig. 2 is a diagram illustrating the structure of messages from subscriber stations of the bus system according to the first
  • Embodiment can be sent;
  • FIG. 3 shows a simplified block diagram of a subscriber station according to the first exemplary embodiment, which connects two domains of the bus system;
  • FIG. 4B a time profile of a transmission signal TxD in a conventional one
  • FIG. 5A shows a time profile of bus signals CAN_H and CAN_L at the subscriber station according to the first exemplary embodiment
  • FIG. 5B shows a time profile of the bus signals CAN_H and CAN_L at the conventional subscriber station;
  • 6A shows a time profile of a differential voltage VDIFF of the bus signals CAN_H and CAN_L at the subscriber station according to the first
  • Embodiment and Fig. 6B a time course of the Differential voltage VDIFF of the bus signals CAN_H and CAN_L in the conventional subscriber station;
  • FIG. 7B a time profile of a received signal RxD in a conventional one
  • Fig. 8 is a diagram illustrating the structure of messages from subscriber stations of a bus system according to a second
  • Embodiment can be sent;
  • Fig. 9 is a diagram illustrating the structure of messages from subscriber stations of a bus system according to a third
  • Embodiment can be sent;
  • FIG. 10 shows a simplified block diagram of a subscriber station according to a fourth exemplary embodiment, which connects two domains of a bus system.
  • bus system 1 shows an example of a bus system 1, which is configured in particular fundamentally for a CAN bus system, a CAN FD bus system, a CAN FE bus system, and / or modifications thereof, as described below.
  • the bus system 1 can be in a vehicle, in particular a motor vehicle, an aircraft, etc., or in a technical system, for example in the
  • the bus system 1 has a first domain 10, a second domain 20, a connecting line 30, a first bus 40 and a second bus 50. There are a variety of connections to the bus 40 of the first domain 10
  • the subscriber stations 11 to 14 are each connected to a first bus line 41 and a second bus line 42 of the bus 40.
  • the first bus 40 is terminated at its ends by means of terminating resistors 48.
  • the bus lines 41, 42 can also be called CAN_H and CAN_L and are used, using a TX signal in the transmission state, for electrical signal transmission after coupling in of dominant levels or generation of recessive levels.
  • Terminating resistors 48 are usually matched to the line impedance of lines 41, 42. If the lines 41, 42 are a two-wire line, the terminating resistors 48 usually have a value in a range of approximately 120 ohms.
  • the subscriber stations 21 to 24 are each connected to a first bus line 51 and a second bus line 52 of the bus 50.
  • the second bus 50 is terminated at its ends by means of terminating resistors 58.
  • the bus lines 51, 52 can also be called CAN_H and CAN_L and, using a signal in the transmission state, serve for electrical signal transmission after coupling in of dominant levels or generation of recessive levels.
  • the first and second buses 40, 50 are connected to one another via the connecting line 30 and the subscriber station 14 of the first domain 10.
  • messages 45, 46 in the form of signals can be transmitted serially between the individual subscriber stations 11 to 14 and 21 to 24 via bus 40 and bus 50.
  • the subscriber stations 11 to 14 and 21 to 24 are, for example, control devices, sensors, display devices, etc. of a motor vehicle.
  • subscriber station 11 has one
  • the subscriber station 12 has a communication control device 121 and a transceiver 122.
  • the subscriber station 13 has a communication control device 131 and a transceiver 132.
  • the subscriber station 14 has a communication control device 141 and a transceiver 142.
  • the transceivers 112, 122, 132, 142 of the subscriber stations 10, 20, 30 are each connected directly to the bus 40, even if this is shown in FIG 1 is illustrated only very schematically.
  • the communication control devices 111, 121, 131, 141 each serve to control communication of the respective subscriber station 11, 12, 13, 14 via the bus 40 with another subscriber station of the subscriber stations 11, 12, 13, 14, which are connected to the bus 40 of the first Domain are connected.
  • Subscriber stations 21, 22, 23, 14 are realized, which are connected to the bus 50 of the second domain 20.
  • the communication control device 111 creates and reads first messages 45, which are, for example, modified CAN messages 45.
  • the modified CAN messages 45 are constructed on the basis of a CAN FE format, which is described in more detail with reference to FIG. 2.
  • the modified CAN messages 45 are therefore also referred to below as CAN FE messages 45.
  • the communication control device 121 can be designed like a conventional CAN controller.
  • the communication control device 121 creates, sends and receives or reads second messages 46, for example Classical CAN messages.
  • the Classical CAN messages are constructed in accordance with the Classical CAN basic format, in which a number of up to 8 data bytes can be included in the message 46.
  • the CAN message 46 is constructed as a CAN FD message, in which a number of up to 64 data bytes can be included, which are also transmitted at a significantly faster data rate than the classic CAN message.
  • the communication controller 121 is like one
  • the communication control device 131 can be designed to provide a CAN FE message 45 or a CAN message 46 for the transmitting / receiving device 142 or to receive it as required.
  • the CAN message 46 is constructed either as a Classical CAN message or as a CAN FD message.
  • the communication control device 31 creates or
  • the communication control device 31 is designed like a conventional Classical CAN and / or CAN FD controller.
  • Communication controller 141 is, for example, like that for encoding and decoding messages 45, 46
  • Communication control device 131 executed. This is described in more detail with reference to FIG. 3.
  • the communication controllers 211 and 241 are, for example, like that for encoding and decoding the messages 45, 46
  • Communication controllers 221 and 231 are like encoding and decoding the messages 46, for example
  • the transceiver 112 can be designed as a CAN FE transceiver.
  • the transceiver 122 can be designed like a conventional Classical CAN transceiver and / or CAN FD transceiver.
  • the transmitting / receiving devices 132, 142 can each be designed to receive messages 45 according to the CAN FE format or messages 46 according to the current Classical CAN basic format for the associated, as required
  • the transceivers 212, 242 are designed like the transceivers 132, 142.
  • the broadcast / Receiving devices 222, 232 are designed in the example of FIG. 1 like the transmitting / receiving device 122.
  • FIG. 2 shows a CAN FE frame 450 for the message 45 as it is sent by one of the transmitting / receiving devices 112, 132, 142, 212, 242.
  • the CAN FE frame 450 is divided into different fields for the CAN communication on the respective bus 40, 50, namely a start field 451, an arbitration field 452, a control field 453, a data field 454, a checksum field 455 and an end field 456.
  • the start field 451 has, for example, a bit, which is also called a SOF bit and indicates the start of the frame 450 or start of frame.
  • Arbitration field 452 contains an identifier with, for example, 32 bits for identifying the sender of the message.
  • the arbitration field 452 can additionally contain protocol format information consisting of one or more bits, which is suitable for distinguishing CAN FE frames from CAN frames or CAN FD frames.
  • the control field 453 contains, for example, a 13-bit data length code (data length code) which can then, for example, assume values from 1 to 4096 with a step size of 1, or alternatively can assume values from 0 to 4095.
  • the data length code can also comprise fewer or more bits and the value range and the step size can assume different values.
  • the control field 453 can additionally contain protocol format information consisting of one or more bits, which is suitable for distinguishing CAN FE frames from CAN frames or CAN FD frames.
  • the data field 454 contains the useful data of the CAN-EL frame for the
  • Message 45 included Depending on the value range of the data length code, the user data can have up to 4096 bytes, for example.
  • a domain ID field 4541 is contained at the beginning of the data field 454.
  • the domain ID field 4541 can have a predetermined number of bits, so that in the domain ID field 4541 it can be specified for which of the domains 10, 20 the frame 450 and thus the useful data in the data field 454 is intended / are.
  • the information in the at least one bit of the domain ID field 4541 decides into which target domain 10, 20 the user data contained in the data phase should be directed.
  • a useful value for the number of bits of the domain ID field 4541 is, for example, 4 bits, in order to be able to choose from 16 possible domains 10, 20.
  • any number of bits can be selected for the number of bits of the domain ID field 4541.
  • checksum field 455 is a checksum on the data in the
  • the end field 456 contains at least one acknowledge bit and also a sequence of 11 identical bits which indicate the end of the CAN FE frame 450.
  • the at least one acknowledge bit can be used to indicate whether or not a receiver has discovered an error in the received CAN FE frame 450 for message 45.
  • a physical layer is used as in the case of Classical CAN and CAN-FD.
  • the physical layer corresponds to the physical layer or layer 1 of the known OSI model (Open Systems Interconnection Model).
  • OSI model Open Systems Interconnection Model
  • the control field 453 and the data field 454 are only sent by a sender of the message 45 to the respective bus 40, 50 if, for example, the subscriber station 11 has won the arbitration as the sender and the subscriber station 11 as the sender has thus sent the fields 453 to 456 has exclusive access to bus 40 of bus system 1.
  • the identifier in the arbitration field 452 is used to negotiate bit by bit between the subscriber stations 11, 12, 13, 14 of the bus 40, which subscriber stations 11 to 14 have the message 45, 46 with the highest priority wants to send and therefore gets exclusive access to the bus 40 of the first domain 10 of the bus system 1 for the next time to send the fields 453 to 455.
  • the bit rate in the arbitration phase when transmitting fields 451, 452, 456 is selected slower than in the other fields of frame 450.
  • the bit rate in the arbitration phase is chosen as 500 kbi1 / s , which results in a bit time of approx. 2ps, whereas the bit rate in the other communication phase (s) is selected as 5 to 8 Mbi1 / s, which results in a bit time of approx. 0.2ps and less. So is the bit time of the signal in the arbitration phase is at least 10 times greater than the bit time of the signal in the other communication phase (s).
  • Fig. 3 shows the basic structure of the subscriber station 14 with the
  • the subscriber station 14 can be an electronic control unit (ECU).
  • the communication control device 141 can be designed as a microcontroller.
  • the subscriber station 14 of the first domain 10 serves as a connecting element between the two domains 10, 20.
  • the subscriber station 14 is also referred to as a domain connection subscriber station 14.
  • the communication control device 141 has a first controller 1411 and a second controller 1412, which can exchange the user data for the data field 454 bidirectionally.
  • the user data for the data field 454 are either received by the bus 40 and as a reception signal RxD to the first
  • the useful data for the data field 454 can be received by the bus 50 and sent to the second as the receive signal RxD
  • Controller 1412 are forwarded.
  • the transceiver 142 has a first transceiver 1421 connected to the bus 40, more precisely the first one
  • Bus wire 41 for CAN H and its second bus wire 42 for CAN L connected.
  • the voltage supply, in particular CAN supply, for the first and second bus wires 41, 42 and the connection to ground or CAN_GND are not shown in FIG. 3 for simplification.
  • the transceiver 142 has a second transceiver unit 1422 which connects to the bus 50, more precisely its first bus wire 51 for CAN_H and its second bus wire 52 for CAN_L
  • the voltage supply, in particular CAN supply, for the first and second bus wires 51, 52 and the connection to ground or CAN_GND are not shown in FIG. 3 for simplification.
  • the first controller 1411 To send the useful data for the data field 454 to the first bus 40, the first controller 1411 generates a transmission signal TxD and sends it to the first transmission / reception unit 1421. After the transmission of signals CAN_H, CAN_L on the bus 40, the first transmission / Receive unit 1421 receive the resulting difference signal from bus 40 again and return it to the first controller 1411 as receive signal RxD.
  • the first controller 1411 To send the user data for the data field 454 to the second bus 50, the first controller 1411 generates a transmission signal TxD and sends it to the second transmission / reception unit 1422. After the transmission of signals CAN_H, CAN_L on the bus 50, the second transmission / Receiving unit 1422 receive the resulting difference signal from bus 50 again and return it to the second controller 1412 as a reception signal RxD.
  • the transmission signal TxD can each be configured such that the
  • Subscriber station 14 either sends a message 45 or a message 46 to the desired bus 40, 50, even if the subscriber station 14 has received the user data for the TxD signal from user data in a data field 454 of a message 45. Accordingly, the result is
  • Received signal RxD designed.
  • Communication controller 141 uses the domain ID field 4541 in a received frame 450 of message 45 to determine the type of communication to be determined with the first and second domains 10, 20 in relation to the message 45. The communication control device 141 then sends the message 45 depending on an evaluation result of the domain ID field 4541 to the first transmitting / receiving unit 1421 or the second transmitting / receiving unit 1422. This is based on an example below
  • the subscriber station 11 of the first domain 10 should be a
  • Send message 45 to a subscriber station 21 to 24 of the second domain 20 the subscriber station 11 sends a corresponding message 45 on the bus 40.
  • the subscriber station 14 receives the message 45 with the first transceiver 1421 from the bus 40 as a received signal RxD and decodes the received signal RxD of the message 45 with the first controller 1411
  • the first controller 1411 recognizes from the information in the domain ID field 4541 that the received message 45 is required in the second domain 20. Therefore, the first controller 1411 passes the data from the
  • the second controller 1412 encodes the data from the data field 454 of the previous message 45 in a transmission signal TxD for a message 46, for example, and sends the transmission signal TxD serially to the second transmission / reception unit 1422.
  • the second transmission / reception unit 1422 transmits the transmission signal TxD finally as the difference signal of the signals CAN_H, CAN_L on the bus 50 of the domain 20.
  • the difference signal of the signals CAN_H, CAN_L on the bus 50 can be received by the subscriber stations 21 to 24 and as a reception signal RxD to the associated one
  • Communication control device 211, 221, 231, 241 are forwarded.
  • subscriber stations in one domain can receive messages from another domain, but cannot send anything themselves to another subscriber station in the other domain.
  • the second controller 1412 can recode the data from the data field 454 of the previous message 45 from the first domain 10 into a transmission signal TxD for, for example, a message 45 in the second domain 20, the message 45 in the present example only from those Subscriber stations 21, 24 can be received.
  • One of the subscriber stations 21, 24 can in turn at least partially send the data to the subscriber stations 22, 23 in a message 46.
  • the data from the first domain 10 can alternatively be penetratingly transmitted on the bus 50 of the second domain 20 and thus possibly the bus traffic on the bus 50 can be disrupted.
  • the message 45, 46 is then repeated until the message 45, 46 arrives at the subscriber station (s) 21 to 24 for which the message 45, 46 was intended.
  • FIG. 4A to 7A each show a time course of signals in the transceiver 142 according to the present exemplary embodiment over the time t. This results in a sequence shown in FIG. 4A
  • Transmitted signal TxD the curves of signals according to FIGS. 5A to 7A over time t.
  • the same signals according to FIGS. 4A to 7A are provided over time t at the transceivers 112, 132, 212, 242, which send and receive messages 45.
  • a change of state takes place over the time t with three successive bits from a first bus state 401 to a second bus state 402 and then back again to the first bus state 401.
  • the first bus state 401 can also be referred to as a recessive state or a high level.
  • the second bus state 402 can also be referred to as a dominant state or a low level.
  • FIGS. 4B to 7B each illustrate the temporal profiles of signals in a transceiver according to a conventional transceiver, such as the transceiver 122 of the subscriber station 12.
  • the same signals according to 4B to 7B are set up at the transceivers 132, 142, 212, 22, 232, 242, which send and receive messages 46.
  • Embodiment for a message 45 with the same transmit signal TxD for a message 46 causes the CAN-H and CAN_L signals to settle much faster, or the differential voltage VDIFF calculated therefrom after the change of state from state 401 to state 402 or from dominant to recessive.
  • the threshold voltage of a receiver of the transceiver 142 is set to the usual value of 0.7 V, as illustrated in FIGS. 6A and 6B, a receiver of the transceiver 142 also recognizes a change of state from state 401 to State 402 or from dominant to recessive no alleged change of state from state 402 to state 401 or from recessive to dominant.
  • sampling the received signal RxD at the currently usual sampling point AP can certainly lead to the desired result, as shown in FIG. 7A. This applies even if the length of the bit time tdom of the state 401 or of a dominant bit is somewhat longer than that of a conventional transceiver or the transceiver 122 of the subscriber station 12, as can be seen from the comparison of FIGS. 7A and 7. 7B.
  • the transceiver 142 according to the present exemplary embodiment is thus designed in such a way that the transceiver 142 has a lower tendency to oscillate than a conventional transceiver or, for example, the transceiver 122.
  • the described design of the transceiver (s) 12, 32 allows much higher data rates in the data phase than with CAN or CAN-FD can be achieved.
  • the data length in the data field 454 can be increased up to 4096 bytes. This allows the advantages of CAN in terms of arbitration to be retained and yet a larger amount of data to be transmitted effectively in a shorter time than before, that is to say without the data having to be repeated because of an error, such as
  • error frames in the bus system 1 are not required for the transmission of messages 45, but can optionally be used. If no error frames are used, messages 45 are no longer destroyed, eliminating a cause for the need for double transmission of messages. This increases the net data rate.
  • FIG. 8 shows a frame 4500 according to a second exemplary embodiment, which can be sent for a message 45 in the bus system 1 from FIG. 1.
  • the frame 4500 contains a domain ID field 4542 at the end of the data field 454 instead of the domain ID field 4541 at the beginning of the data field 454.
  • the domain ID field 4542 can have a predetermined number of bits, so that the domain ID field 4542 can indicate which domain 10, 20 is to be decoupled after the useful data contained in the data field 454 have been transmitted. In other words, the information in the at least one bit of the domain ID field 4542 decides which domain 10, 20 is to be decoupled.
  • a reasonable value for the number of bits of the domain ID field 4542 can be 4 bits, out of 16 possible ones
  • any number of bits can be selected for the number of bits of the domain ID field 4542.
  • the functionality of the subscriber station 14 and its connection to the buses 40, 50 can thus also be used to separate the domains 10, 20 to decouple. By default, domains 10, 20 are over one
  • Switch node or a domain connection subscriber station such as the subscriber station 14 of FIG. 1 connected.
  • Domain ID bit (s) in the domain ID field 4542 then domains 10, 20 are decoupled.
  • FIG. 9 shows a frame 4501 according to a third exemplary embodiment, which can be sent for a message 45 in the bus system 1 from FIG. 1.
  • the frame 4501 contains both the domain ID field 4541 at the beginning of the data field 454 and the domain ID field 4542 at the end of the data field 454.
  • the subscriber station 14 can thus carry out all of the methods described with reference to the preceding exemplary embodiments.
  • FIG. 10 shows the basic structure of a subscriber station 140 with a communication control device 1410 and the transceiver 142 in greater detail.
  • the communication control device 1410 has a buffer memory 1411A in the first controller 1411 and a buffer memory 1412A in the second controller 1412.
  • the subscriber station 140 of the domain 10 reads the message 45 to be transmitted, stores the message 45 or its message
  • Subscriber station 140 thus realizes a switch with a buffer function.
  • At least one of the buffer memories 1411A, 1411B is arranged externally from the controller 1411, 1412 mentioned. All previously described configurations of the subscriber stations 12 to 14 and 21 to 24 of the bus system 1 and the method carried out therein can be used individually or in all possible combinations.
  • the position of the domain ID fields 4541, 4542 in the frames 450, 4500, 4501 have no influence on the functionality described above.
  • at least one of the subscriber stations 11, 13, 14, 21, 24, 140 can define the position of the domain ID fields 4541, 4542 in the frames 450, 4500, 4501 differently depending on the domain 10, 20.
  • bus system 1 is described using a bus system based on the CAN protocol.
  • the bus system 1 according to the exemplary embodiments can also be another type of communication network, in which data can be transmitted serially at two different bit rates. It is advantageous, but not inevitable, that an exclusive, collision-free access of one at least for certain periods of time in the bus system 1
  • Subscriber station 10, 20, 30 is guaranteed on a common channel.
  • the number and arrangement of the subscriber stations 12 to 14 and 21 to 24 in the domains 10, 20 of the bus system 1 of the exemplary embodiments is arbitrary.
  • the subscriber stations 12, 22, 23 in the bus system 1 can be omitted. It is possible for one or more of the subscriber stations 11 to be present in the bus system 1. It is possible for one or more of the subscriber stations 13, 14, 21, 24 to be present in the bus system 1.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)

Abstract

La présente invention concerne une station participante de liaison interdomaine (14 ; 140) et une station participante pour un système de bus série (1) ayant deux domaines (10, 20) et un procédé de transmission d'un message (45) avec différents débits binaires dans un système de bus série (1). La station participante de liaison interdomaine (14 ; 140) comporte : un dispositif de commande de communication (141 ; 1410) pour commander une communication de la station participante (14 ; 140) avec au moins une autre station participante (12 à 13 ; 21 à 24) du système de bus (1) ; et un dispositif d'émission-réception (142 ; 1420) qui comprend une première unité d'émission-réception (1421) pour émettre des messages (45 ; 46) sur un bus (40) d'un premier domaine (10) du système de bus (1) et/ou pour recevoir des messages (45 ; 46) du bus (40) du premier domaine (10), et qui comprend une seconde unité d'émission-réception (1422) pour émettre des messages (45 ; 46) sur un bus (50) d'un second domaine (20) du système de bus (1) et/ou pour recevoir des messages (45 ; 46) du bus (50) du second domaine (20). Le dispositif de commande de communication (141 ; 1410) est conçu pour évaluer, dans une trame (450 ; 4500 ; 4501) reçue pour le message (45) au moins un champ d'identification de domaine (4541 ; 4542) pour déterminer le type de communication qui doit être exécuté avec le premier et le second domaine (10, 20) du système de bus (1). Le dispositif de commande de communication (141 ; 1410) est également conçu pour émettre le message (45) en fonction d'un résultat d'évaluation du ou des champs d'identification de domaine (4541 ; 4542) vers la première unité d'émission-réception (1421) ou vers la seconde unité d'émission-réception (1422).
PCT/EP2019/082600 2018-11-28 2019-11-26 Station participante pour un système de bus série et procédé de transmission d'un message dans un système de bus série WO2020109313A1 (fr)

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DE102018220498.5A DE102018220498A1 (de) 2018-11-28 2018-11-28 Teilnehmerstationen für ein serielles Bussystem und Verfahren zum Übertragen einer Nachricht in einem seriellen Bussystem
DE102018220498.5 2018-11-28

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WO2020109313A1 true WO2020109313A1 (fr) 2020-06-04

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120140861A1 (en) * 2010-12-01 2012-06-07 GM Global Technology Operations LLC Data Sensor Coordination Using Time Synchronization in a Multi-Bus Controller Area Network System
US20170267193A1 (en) * 2016-03-15 2017-09-21 Honda Motor Co., Ltd. Communication apparatus and communication system
US20180205576A1 (en) * 2015-07-15 2018-07-19 Hitachi Automotive Systems, Ltd. Gateway device and control method for the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120140861A1 (en) * 2010-12-01 2012-06-07 GM Global Technology Operations LLC Data Sensor Coordination Using Time Synchronization in a Multi-Bus Controller Area Network System
US20180205576A1 (en) * 2015-07-15 2018-07-19 Hitachi Automotive Systems, Ltd. Gateway device and control method for the same
US20170267193A1 (en) * 2016-03-15 2017-09-21 Honda Motor Co., Ltd. Communication apparatus and communication system

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