WO2019122207A1 - Station de participant au bus pour un système de bus série et procédé d'envoi d'un message dans un système de bus série - Google Patents

Station de participant au bus pour un système de bus série et procédé d'envoi d'un message dans un système de bus série Download PDF

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Publication number
WO2019122207A1
WO2019122207A1 PCT/EP2018/086334 EP2018086334W WO2019122207A1 WO 2019122207 A1 WO2019122207 A1 WO 2019122207A1 EP 2018086334 W EP2018086334 W EP 2018086334W WO 2019122207 A1 WO2019122207 A1 WO 2019122207A1
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WO
WIPO (PCT)
Prior art keywords
bus
message
stage
state
low
Prior art date
Application number
PCT/EP2018/086334
Other languages
German (de)
English (en)
Inventor
Steffen Walker
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to CN201880090007.3A priority Critical patent/CN111713078B/zh
Priority to EP18826684.5A priority patent/EP3744050A1/fr
Publication of WO2019122207A1 publication Critical patent/WO2019122207A1/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
    • H04L12/407—Bus networks with decentralised control
    • H04L12/413—Bus networks with decentralised control with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD]
    • H04L12/4135—Bus networks with decentralised control with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD] using bit-wise arbitration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/407—Bus networks with decentralised control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/407—Bus networks with decentralised control
    • H04L12/413—Bus networks with decentralised control with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD]
    • 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 station for a serial bus system and method for sending a
  • the present invention relates to a subscriber station for a serial bus system and a method for transmitting a message in a serial bus system operating at high data rate and with high error robustness.
  • Bus participants of the bus system such as sensor, controller, encoder, etc., transferred.
  • the CAN FD message format In order to transmit data at a higher bitrate than CAN, the CAN FD message format has created an option to switch to a higher bit rate within a message. With such techniques, the maximum possible data rate is increased beyond a value of 1 Mbit / s by using a higher clock rate in the area of the data fields. Such news are also referred to below as CAN FD frames or CAN FD messages. With CAN FD, the user data length has been extended from 8 to 64 bytes and the data transmission rates are significantly higher than with CAN.
  • a subscriber station for a serial bus system and a method for transmitting a message in a serial bus system which solve the aforementioned problems.
  • a subscriber station for a serial bus system and a method for transmitting a message in a serial bus system are to be provided in which a high error robustness is required
  • the object is achieved by a subscriber station for a serial bus system with the features of claim 1.
  • the subscriber station comprises a transmission stage for transmitting a message to a bus line of the bus system, the transmission stage having output stages for switching differential bus signals for a message between a high-bus state and a low-bus state, and wherein the transmission stage is constructed such that for at least a phase for transmitting data of the message the differential
  • Bus signals for a low bus state have the same level and the low bus state is driven low impedance.
  • the subscriber station With the subscriber station, a significant increase in the bit rate and thus the transmission speed from transmitter to receiver can be realized. At the same time, however, a large error robustness is ensured. Due to the configuration of the subscriber station no error frames (error frames) are required more. This helps to realize a net data rate of at least 10 Mbps. In addition, the size of the user data can be up to 4096 bytes per frame.
  • Another advantage is that multiple domains can be interconnected by switches as needed. That lowers the
  • the method performed by the subscriber station can also be used if there is also at least one CAN subscriber station and / or at least one CAN FD subscriber station in the bus system
  • the transmission stage is configured to switch to a first mode with two first different bus states for a message when data of a first phase to be transmitted from the message is to be transmitted at a first bit rate, and wherein the
  • Transmitter is configured to switch to a second mode with the high bus state and the low bus state for a message when from the
  • Message is to send data of a second phase, which is to be sent at a second bitrate that is faster than the first bitrate.
  • the transmission stage is designed to switch to the second operating mode for transmitting data only if exclusive, collision-free access to the bus line of the bus system is ensured for the subscriber station for a predetermined time.
  • the transmit stage has a first output stage connected between a power supply terminal and a first power amplifier
  • Busader the bus line is connected, a second output stage, which is connected between a second bus wire of the bus line and a terminal for ground, a third output stage, which is connected between the first bus wire of the bus line and a first voltage source as a reference for the low-bus state, and a fourth output stage connected between a second voltage source as a reference for the low bus state and the second bus line of the bus line.
  • the first and fourth output stage have a PMOS transistor
  • the second and third output stage have an NMOS transistor
  • the transmit stage may be configured to reduce the drive capability of the first and second output stage for a low-bus state, or
  • the message it is possible for the message to have a data field of variable length, the variable length being from 1 byte to 4096 bytes.
  • the subscriber station described above may be part of a bus system, which also comprises a parallel bus line and at least two subscriber stations, which are connected to one another via the bus line so that they can communicate with each other.
  • at least one of the at least two subscriber stations is a subscriber station described above.
  • the above object is further achieved by a method for transmitting a message in a serial bus system according to claim 9.
  • the method has the step: transmitting, with a transmission stage of a subscriber station of the bus system, a message to a bus line of the bus system, wherein the transmission stage with output stages switches differential bus signals for a message between a high-bus state and a low-bus state, and
  • the transmission stage is configured such that for at least one phase for transmission of data of the message, the differential bus signals for a low bus state have the same level and drive the low bus state low impedance.
  • Subscriber station are called.
  • FIG. 1 is a simplified block diagram of a bus system according to a first embodiment
  • FIG. 2 is a diagram for illustrating the structure of messages sent from subscriber stations of the bus system according to the first embodiment
  • Embodiment can be sent;
  • FIG. 3 shows a circuit diagram of a transmission stage of a subscriber station of the bus system according to the first embodiment
  • FIG. 4 shows a representation of an example of a temporal voltage profile of differential bus signals CAN_H and CAN_L, which are generated by the transmission stage according to the first exemplary embodiment for part of a message;
  • FIG. 5 shows a representation of an example of a temporal voltage curve of bus signals after a switching of the transmission stage according to the first exemplary embodiment into a faster data transmission mode than in FIG. 4;
  • 6 shows a representation of an example of a temporal voltage profile of the bus signals CAN_H and CAN_L for a part of a message in a second embodiment;
  • FIG. 7 is a circuit diagram of a transmission stage of a subscriber station of the bus system according to the second embodiment
  • 10 is a circuit diagram of a transmission stage of a subscriber station of a
  • FIG. 11 and FIG. 12 are each an illustration of an example of a temporal waveform of differential bus signals for various parts of a message in a fourth embodiment
  • FIG. 13 shows a circuit diagram of a coupling of the transmission stage of a subscriber station to bus wires of a bus system according to a fifth exemplary embodiment
  • FIG. 14 is a circuit diagram of a coupling of the transmission stage of a subscriber station to bus wires of a bus system according to a modification of the fifth
  • bus system 1 shows, as an example, a bus system 1, which is designed in particular fundamentally for a CAN bus system, a CAN FD bus system, a CAN EL bus system, and / or modifications thereof, as described below.
  • the bus system 1 can be used in a vehicle, in particular a motor vehicle, an aircraft, etc., or in the hospital, etc.
  • the bus system 1 has a, in particular parallel, bus line 3, to which a plurality of subscriber stations 10, 20, 30 are connected. Messages 4, 5 in the form of signals between the individual subscriber stations 10, 20, 30 can be transmitted serially via the bus line 3.
  • Subscriber stations 10, 20, 30 are, for example, control devices, sensors, display devices, etc. of a motor vehicle.
  • the subscriber station 10 has a
  • the subscriber station 20 has a communication control device 21 and a transceiver 22.
  • the subscriber station 30 has a communication control device 31 and a transceiver 32.
  • the transceiver devices 12, 22, 32 of the subscriber stations 10, 20, 30 are each connected directly to the bus line 3, although this is not illustrated in Fig. 1.
  • the communication control devices 11, 21, 31 each serve to control a communication of the respective subscriber station 10, 20, 30 via the bus line 3 with another subscriber station of the subscriber stations 10,
  • the communication controller 11 may be implemented like a conventional CAN controller.
  • the communication control device 11 creates and reads first messages 4, for example Classic CAN messages 4.
  • the Classic CAN messages 4 are constructed in accordance with the Classic basic format in which a number of up to 8 data bytes can be included in the message 4.
  • the Classic CAN message 4 is constructed as a CAN FD message in which a number of up to 64 bytes of data can be included, which are still transmitted at a much faster data rate than the Classic CAN message 4. In the latter case, the
  • Communication controller 11 as a conventional CAN FD controller executed.
  • the communication controller 21 prepares and reads second messages 5, which are modified CAN messages 5, for example.
  • the modified CAN messages 5 are constructed on the basis of a CAN EL format, which is described in more detail with reference to FIG. 2.
  • the communication controller 31 may be configured to provide or receive a Classic CAN message 4 or a CAN EL message 5 to the transceiver 32 as needed.
  • the communication control device 21 thus creates and reads a first message 4 or a second message 5, wherein the first and second messages 4, 5 differ by their data transmission standard, namely in this case CAN or CAN EL.
  • the Classic CAN message 4 is constructed as a CAN FD message.
  • the communication controller 11 is implemented like a conventional CAN FD controller.
  • the transceiver 12 may be like a conventional CAN
  • Transceiver or CAN FD transceiver be executed.
  • the transmitting / receiving device 22 may be even more accurate except as follows
  • the transceiver 32 may be configured to provide or receive messages 4 according to the current CAN base format or messages 5 according to the CAN EL format for the communication controller 31 as needed.
  • the transceivers 22, 32 are additionally or alternatively like a
  • FIG. 2 shows for the message 5 a CAN EL frame 45 as it is transmitted by the transceiver 22 or the transceiver 32.
  • the CAN-EL frame 45 is subdivided into different fields for the CAN communication on the bus line 3, namely a start field 451 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 one bit, also called SOF bit, indicating the beginning of the frame.
  • Arbitration field 452 contains an identifier, in particular 32 bits, for identifying the sender of the message.
  • the control field 453 contains an in particular 13-bit long data length code (data length code), which can have values up to 4096 with the increment of 1.
  • data length code data length code
  • the payload data may have up to 4096 bytes according to the value of the data length code.
  • the checksum field 455 contains a checksum of the data in the data field 454 including the stuff bits which are inserted by the sender of the message 5 every 10 equal bits as an inverse bit.
  • the end field 456 contains at least one acknowledge bit and also a sequence of 11 equal bits indicating the end of the CAN EL frame 45.
  • the at least one acknowledge bit informs whether a receiver has detected an error in the received CAN EL frame 45 or the message 5 or not.
  • bus subscriber stations 10, 20, 30 can be added to the bus system 1 relatively simply, which is very advantageous.
  • control field 453 and the data field 454 are only sent to the bus line 3 by a sender of the message 5 when the subscriber station 20 has won the arbitration as the sender and the subscriber station 20 as sender therefore has exclusive access to send the fields 453 to 456 the bus line 3 of the bus system 1 has.
  • arbitration using the identifier in the arbitration field 452, bitwise between the
  • Subscriber stations 10, 20, 30 negotiated which subscriber station 10, 20, 30 would like to send the message 4, 5 with the highest priority and therefore gets the exclusive access to the bus line 3 of the bus system 1 for the next time to send the fields 453-455 ,
  • the arbitration at the beginning of a frame 45 or the message 4, 5 and the acknowledgment in the end field 456 at the end of the frame 45 or the message 4, 5 is only possible if the bit time is significantly more than twice as long as the Signal transit time between any two subscriber stations 10, 20, 30 of the bus system 1. Therefore, the bit rate in the Arbitrationphase when transmitting the fields 451, 452, 456 is selected to be slower than in the remaining fields of the frame 45th
  • FIG. 3 shows the embodiment of a transmission stage 220 of the transceiver 22 in the present embodiment.
  • Receive stage is not shown in Fig. 3, but may be implemented as a conventional receiving stage for CAN or CAN FD messages.
  • the transmission stage 220 is connected at its terminals 221, 222 to the parallel bus line 3, more precisely its first bus wire 41 for CAN_H and its second bus wire 42 for CAN_L.
  • a connection 223 is provided at the transceiver 12.
  • the voltage supply can be carried out in particular with a voltage Vcc or CAN supply of, for example, about 2.5 V according to the standard ISO11898-1: 2015 as a CAN protocol specification with CAN FD. Of course, however, voltage values other than voltage are different Vcc selectable.
  • the connection of the transmitting / receiving device 22 to ground or CAN_GND is realized via a connection 224.
  • For termination of the first and second bus wires 41, 42 is in the example shown a
  • Terminating resistor or external bus load resistor 43 is provided.
  • the transmission stage 220 has a first output stage 225 for the signal CAN_H for the first bus wire 41 and a second output stage 226 for the signal CAN_L for the second bus wire 42.
  • the transmission stage 220 has a third output stage 227 for the first bus wire 41 and a fourth output stage 228 for the second bus line 42.
  • the output stages 225 to 228 can be designed like the corresponding output stages for a conventional output stage of CAN.
  • the transistors of the output stages 225 to 228 can be connected to their gates directly or via a switch 229 to a terminal 211. From the terminal 211, a transmission signal TxD of the communication control device 11 is input to the transmission stage 220.
  • the two switches 229 form a switching device. The two switches 229 are in particular switchable together.
  • the transceiver 22 in the transmission stage 220 for driving a dominant bus state activates only the first output stage 225 for the signal CAN_H for the first bus core 41 and the second output stage 226 for the signal CAN_L for the second bus line 42.
  • the third and fourth power stages 227 and 228 remain inactive, not only for a recessive one
  • Bus state must drive. This can be done, for example, by switching the switches 229 to the open position, which is shown in FIG. 4, or only via a corresponding signal at the terminal 211, when the transistors of the output stages 225 to 228 are respectively connected directly to the terminal 211 at their gates , If the transmission stage 220 is to drive a recessive bus state, all output stages 225, 226, 227, 228 are disabled or inactive. As a result of this, they turn up Signals CAN_H, CAN_L, which are shown in Fig. 4 and described in more detail below.
  • the transmitting / receiving device 22 in the transmitting stage 220 activates both the first and third output stages 225, 227 for a signal 411 on the first bus core 41 and the second one and fourth output stage 226, 228 for a signal 421 on the second bus wire 42, as described in more detail below.
  • all output stages 225 to 228 are active, as described in more detail below. This can
  • Communication control device 11 is connected to the gate of the respective transistor of the output stages 227, 228. Alternatively, the switching is the
  • Signal states 411, 421 only via a corresponding signal at the terminal 211 possible, as previously mentioned. As a result, signals 411, 421 turn on, as shown in FIG. 5 and described in more detail below.
  • bus levels for CAN_H, CAN_L can be generated with a bus load resistance 43 of approximately 60 ohms.
  • Bus load resistance 43 of about 90 ohms can be generated.
  • the switching of the bus load resistor 43 can be effected in particular by a corresponding optional resistor 230 of the transmission stage 220, which is switchable parallel to the bus load resistor 43. This is a change of
  • Resistance value of the effective bus load resistor 43 or 43, 230 from a first or lower resistance in the arbitration phase, which includes the fields 456, 451, 452, to a second or greater resistance value in the data phase, which includes the fields 453-455 , If the resistor 230 is not present, the bus load resistor 43 for the
  • the bus load resistor 43 is then selectable as a value between 60 and 90 ohms, for example, 70 ohms or other suitable value.
  • the bus levels on the bus line 3 for the recessive states are equal to the voltage Vcc or CAN supply, for example, about 2.5 V.
  • VDIFF CAN_H - CAN_L for the recessive states
  • a value of OV and for the dominant states have a value of approximately 2.0 V, as can be read from FIG. 4.
  • the transmission stage 220 is switched from the state shown in FIG. 4 to the state in which the signal curves of FIG. 5 result for the respective bus levels generated by the transmission stage 220.
  • an idle state idle_LP is reached directly after switching, which in the particular example of FIG. 5 sets a bus level of about 0V.
  • the state of a bus level of about OV after switching should not occur.
  • an idle state idle is reached at which, in the particular example of FIG. 5, a bus level of approximately 2.5V is established before bus states corresponding to data states Data_0 and Data_l are reached.
  • the signal 411 for the bus state corresponding to the data state Data_0 via the NMOS transistor of the third output stage 227 is pulled to about 1.5V.
  • bus state signal 421 corresponding to the data state Data_0 is pulled to about 3.5V via the PMOS transistor of the fourth output stage 228.
  • Data_l is achieved by pulling the signal 411 to about 3.5 V via the PMOS transistor of the first output stage 225 and pulling the signal 421 to about 1.5 V via the NMOS transistor of the second output stage 226.
  • bus level 3 has bus level between about -0.6 V and about -2 V in the state Data_0 and bus level between about 0.6 V and about 2 V in the state Data_l.
  • a differential voltage U_D of the signals 421, 411 thus as a rule has a maximum amplitude of approximately 1.4 V.
  • the transmission stage 220 in a first operating mode according to FIG. 4, the transmission stage 220 generates a first data state, for example Data_l, as bus state with different bus levels for two bus wires 41, 42 of the bus line and a second data state, for example Data_0, as bus state with the same bus level for the bus two bus wires 41, 42 of the bus line 3.
  • a first data state for example Data_l
  • a second data state for example Data_0
  • both the first and second output stages 225, 226 conduct and disable the final stages 227, 228 when a first data state For example, the state Data_l, to be driven to the bus line 3.
  • the transmission stage 220 switches the third and fourth output stages 227 and 228 conductive and blocks the output stages 225, 226 when a second data state, for example the state Data_0, is to be driven onto the bus line 3.
  • the transmission stage 220 is configured to generate the first and second data states as a bus state having different bus levels for the two bus wires 41, 42 of the bus line 3, respectively
  • Another advantage is that error frames in the bus system 1 are not required in the transmission of messages 5. As a result, messages 5 are no longer destroyed, which eliminates a cause for the need for duplicate message transmission. This increases the net data rate.
  • FIG. 6 shows voltage profiles of bus signals 412, 422 and 413, 423 according to a second exemplary embodiment.
  • the voltage curves of the bus signals 412, 422 and 413, 423 arise when the switches 229 of the transmission stage 220 of FIG. 3 omitted or kept in the closed state, so that the transistors of the output stages 227, 228 connected directly to the terminals 211 are.
  • Fig. 7 shows the resulting transmission stage 220A of the second
  • a physical layer is used for the entire frame 45 of FIG.
  • the advantage of switching the transmitting stage 220A into such an operating mode is that the transmitting stage 220A is constructed completely symmetrical and works symmetrically also in all communication phases. Thus, the value of the bus load resistor 43 is not switched as described above with reference to FIGS. 3 and 4.
  • Fig. 6 the resulting bus signals are shown in all four possible bus states DF1, DF2, A1, A2 in such a transmit stage 220A.
  • Differential voltage U_D2 of the bus states DF1, DF2 has a greater amplitude than the differential voltage U_D3 of the bus states Al, A2.
  • the amplitude of the differential voltage U_D2 has a value that is n times greater than a value of the amplitude of the differential voltage U_D3, where n is a natural number that can be selected as desired.
  • the upper limit for the number of subscriber stations 10, 20, 30 in the bus system 1 is calculated as n-1.
  • the amplitude of the differential voltage U_D3 can therefore also be referred to as the amplitude basic unit.
  • the two bus states DF1 and DF2 are communicated after completed arbitration in the data phase, ie in fields 453 to 455. This is similar to the procedure described above with respect to FIG.
  • Bus states Al and A2 are introduced to allow arbitration.
  • the bus states Al, A2 are qualitatively equal to the bus states DF1 and DF2, but are driven weaker by the transmit stage 220A than the bus states DF1, DF2, as illustrated in FIG. Therefore, the bus states Al, A2 can be overwritten by other subscriber stations 10, 30 for arbitration purposes.
  • Amplitude basic unit the affected subscriber station 10, 20,
  • the transmit stage 220A in a first mode of operation, switches between the two first different bus states A1, A2 for the message, when data of the arbitration phase or first phase 456, 451, 452 is to be sent from the message 5.
  • the switches in a first mode of operation, switches between the two first different bus states A1, A2 for the message, when data of the arbitration phase or first phase 456, 451, 452 is to be sent from the message 5.
  • the transmission stage 220A thus switches between more than two different bus states DF1, DF2, A1, A2 in order to transmit the message 5 or the frame 45.
  • the two bus states DF1, DF2 are symmetrical to each other.
  • the two bus states Al, A2 are symmetrical to each other.
  • even more than the four bus states mentioned above are possible.
  • arbitration instead of the bus states Al with A2 becomes one of the following
  • all four bus states DF1, DF2, A1, A2 are used at least for transmitting the data field 454.
  • use of the four bus states DF1, DF2, A1, A2 in the fields 453, 455 is possible.
  • Coding can thus increase the bitrate.
  • the frequency of the signals 412, 422, 413, 423 is reduced. This is one
  • FIGS. 8 and 9 show voltage profiles of bus signals CAN_H, CAN_L for explaining the behavior of a bus system 1 according to a third
  • Embodiment. 8 shows the known voltage profiles of the bus signals CAN_H and CAN_L, which are used to transmit a message 5 or a frame 45 according to the present embodiment for the arbitration phase 456, 451, 452 of the frame 45.
  • the voltage profiles of the bus signals CAN_H and CAN_L show a significantly slower state change in the case of a transition from a dominant state 46 to a recessive state 47 than during a transition from the recessive state 47 to the dominant state 46.
  • signals CAN_EL_H and CAN_EL_L according to FIG. 9 are generated for the data phase 453, 454, 455 of the frame 45, which have a high state 461 and a low state 471.
  • the signals according to FIG. 9 are generated with a physical layer, in which the high states 461 resemble a dominant state 46 of CAN or CAN FD, as shown in FIG. 8 and FIG
  • the transition from the high state 461 to the low state 471 occurs about as fast as the transition from the low state 471 to the high state 461.
  • the transceiver 22 and / or the transceiver 32 when the end of the arbitration phase is detected, the CAN physical layer is switched to another physical layer. Because on error frames or error frames can be dispensed with, in the data phase, no other subscriber station 10, 20, 30, the currently transmitting subscriber station 10, 20, 30 can run over. Consequently, in the data phase, no recessive (high-impedance)
  • the physical layer for the waveforms according to FIG. 9 can be achieved, for example, with a transmission stage 2200 according to FIG. 10.
  • the transmitting stage 2200 thus has a third output stage 2270 connected to a voltage source 232 and a fourth output stage 2280 connected to a voltage source 233 is.
  • the third output stage 2270 has an NMOS transistor and a diode.
  • the fourth output stage 2280 has a PMOS transistor and a diode.
  • the transistors of the first and second output stage 225, 226 are driven via a driver circuit 230 with the transmission signal TxD.
  • the transistors of the third and fourth output stage 225, 226 are driven via a driver circuit 231 with the transmission signal TxD.
  • a high state 461 is imaged in that the output stages 225, 226 controlled via the driver circuit 230 become conductive or are switched active, and the output stages 227, 228 and 13 controlled via the driver circuit 231
  • Voltage sources 232, 233 are high-impedance or switched off. In order to drive a low state 471 (low-impedance driven recess), the drive capability, in particular high, of the output stages 225, 226 controlled via the driver circuit 230 is reduced and that via the driver circuit 231
  • Controlled output stages 227, 228 and voltage sources 232, 233 become conductive.
  • the reduction of the drive capability also includes the case that the output stages 225, 226 are turned off, which means the strongest reduction of the drive capability.
  • the NMOS transistor of the third output stage 2270 pulls the terminal 221 for CAN-EL_H at 2.5 V and the PMOS transistor of the fourth output stage 2280 raises the terminal 221 for CAN-EL_L to 2.5 V, thereby a low-bus state 471 arises.
  • the circuit of FIG. 10 is particularly useful in junction-isolated semiconductor technologies.
  • low-state low-resistance 471 low-resistance recessed
  • the above-mentioned low-state low-resistance 471 (low-resistance recessed) principle can alternatively be used for all other serial bus systems in which recession states are present.
  • FIGS. 11 and 12 show voltage profiles of bus signals CAN_EL_H1, CAN_EL_L1 and CAN_EL_H2, CAN_EL_L2 for explaining the behavior of a bus system 1 according to a fourth exemplary embodiment.
  • the voltage profiles of the bus signals CAN_EL_H1, CAN_EL_L1 of FIG. 11 are equal to the voltage characteristics of the bus signals CAN_EL_H, CAN_EL_L of FIG. 9. The difference, however, is that the transmission stage 2200 of FIG. 10 shows the voltage characteristics of the bus signals CAN_EL_H1, CAN_EL_L1 of FIG generated in the arbitration phase of the frame 45. Alternatively, however, the voltage characteristics of the bus signals CAN_H, CAN_L of Fig. 8 in the
  • Embodiment when the end of the arbitration phase is detected, in a mode in which the transmitting stage 2200, the voltage waveforms of the bus signals CAN_EL_H2, CAN_EL_L2 of FIG. 12 for the data of the data phase of the frame 45 is generated.
  • the bus signal CAN_EL_H2 of FIG. 12 has a voltage level of about 3.0V in a dominant state 462.
  • Bus signal CAN_EL_L2 of FIG. 12 has a voltage level of about 2.0 V in the dominant bus state 462.
  • the dominant bus state 462 has voltage levels for the bus signals CAN_EL_H2, CAN_EL_L2 which are opposite to the voltage levels for the dominant bus state 461 of the bus signals CAN_EL_H1, CAN_EL_L1 in FIG the arbitration phase are reduced.
  • the differential voltage Vdiff CAN_EL_H2 - CAN_EL_L2 of the signals from FIG. 12 is also only 1.0 V and is thus smaller than, more precisely, only half as large as, the difference voltage Vdiff of the signals from FIG. 11 or FIG. provided the bus load resistor 43 remains the same.
  • the low states 471 are unchanged.
  • Switching operations take place as with CAN or CAN FD. This is achieved by lowering the transmission level or the amplitude of VDIFF at least in the data field 454.
  • the transmit stage 2200 of FIG. 10 has no output stages 2270, 2280.
  • the transmit stage 2200 of FIG. 10 is configured as a conventional CAN transmit stage.
  • a conventional CAN transmission stage is controlled such that for dominant states or high states 461 outside the data phase, that is to say signal curves according to FIG
  • the output stages 225, 226 are operated "normally" as with CAN.
  • dominant states 462 of FIG. 12 ie in the data phase 225 and 226, the driver or power amplifiers 225, 226 are operated at higher impedance, whereby the level of the respective dominant states 462 compared to the level of the respective dominant states or High states 461 is reduced.
  • FIG. 13 shows an example of a coupling of the transmitting / receiving devices 22 to the bus line 3 with its two bus wires 41, 42.
  • the coupling can be applied to all the transceivers 22, 32 of the preceding FIGS
  • Embodiments and their transmission levels 220, 220A, 2200 are used.
  • a first coupling capacitor 251 for the coupling of the transmitting / receiving devices 22 to the first bus core 41 and a second
  • Coupling capacitor 251 for the coupling of the transmitting / receiving devices 22 to the second bus line 42 is provided.
  • a resistor 255 is provided between the terminal 223 for the power supply for the first and second bus wires 41, 42 and the terminal 221 for the first bus wire 41.
  • a resistor 256 is provided between the terminal 223 and the terminal 222 for the second bus wire 42.
  • the capacitors or coupling capacitors 251, 252 are provided externally of the respective transceivers 22.
  • the Coupling capacitors 251, 252 realize in contrast to other serial bus systems 1, such as CAN or CAN-FD or Flexray, etc., a galvanically isolated connection of the respective transmitting / receiving device 22 to the bus wires 41, 42nd
  • AC coupling by means of the coupling capacitors 251, 252 is that common mode noise (common mode interference) on the bus line 3, the respective existing transmission stage 220, 220A, 2200 of the preceding
  • Embodiments or as shown in FIG. 13 do not disturb. Another advantage is that the respective existing transmission stage 220, 220A, 2200 of
  • the transmission stage is configured to connect the first and second coupling capacitors (251, 252) with high or low
  • Terminal 223 is provided for the power supply for the first and second bus wires 41, 42 and the terminal 221 for the first bus wire 41, a transistor 257 is provided.
  • a transistor 258 is provided instead of the resistor 256 provided between the terminal 223 and the terminal 222 for the second bus wire 42. Also in this way can with the coupling capacitors 251, 252, the galvanically isolated connection of the respective transmitting / receiving device 22 to the bus wires 41, 42 be executed. All of the previously described embodiments of the bus system 1, the
  • Subscriber stations 10, 20, 30 and the method carried out by them can be used individually or in all possible combinations.
  • the bus system 1 according to the exemplary embodiments described above is described on the basis of a bus system based on the CAN protocol.
  • the bus system 1 according to the embodiments may be another type of communication network in which data is serially transferable at two different bit rates. It is advantageous, but not necessarily a prerequisite, that in the bus system 1 at least for certain periods of time an exclusive, collision-free access of a
  • Subscriber station 10, 20, 30 is ensured on a common channel.
  • Bus system 1 of the embodiments is arbitrary.
  • the subscriber station 10 can be omitted in the bus system 1. It is possible that one or more of the subscriber stations 20 or 30 are 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)
  • Dc Digital Transmission (AREA)

Abstract

La présente invention a trait à une station de participant au bus (20 ; 30) pour un système de bus (1) et à un procédé pour envoyer un message avec des débits binaires différents dans un système de bus (1). La station de participant au bus (20 ; 30) comporte un étage d'envoi (2200) pour envoyer un message (4 ; 5) sur une ligne de bus (3) du système de bus (1), l'étage d'envoi (2200) comprenant des étages finaux (225, 226, 2270, 2280) pour la commutation de signaux de bus différentiels (CAN_EL_H ; CAN_EL_H) pour un message (5) entre un état de bus haut (461) et un état de bus bas (471) et l'étage d'envoi (2200) étant constitué de manière que, pour au moins une phase de transmission de données du message (5), les signaux de bus différentiels (CAN_EL_H ; CAN_EL_H) ont pour un état de bus bas (471) le même niveau et l'état de bus bas (471) présente une faible résistance ohmique.
PCT/EP2018/086334 2017-12-22 2018-12-20 Station de participant au bus pour un système de bus série et procédé d'envoi d'un message dans un système de bus série WO2019122207A1 (fr)

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CN201880090007.3A CN111713078B (zh) 2017-12-22 2018-12-20 用于串行总线系统的用户站和用于在串行总线系统中发送消息的方法
EP18826684.5A EP3744050A1 (fr) 2017-12-22 2018-12-20 Station de participant au bus pour un système de bus série et procédé d'envoi d'un message dans un système de bus série

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DE102018202164.3A DE102018202164A1 (de) 2017-12-22 2018-02-13 Teilnehmerstation für ein serielles Bussystem und Verfahren zum Senden einer Nachricht in einem seriellen Bussystem

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DE102020205257A1 (de) * 2020-04-24 2021-10-28 Robert Bosch Gesellschaft mit beschränkter Haftung Kommunikationssteuereinrichtung und Sende-/Empfangseinrichtung für eine Teilnehmerstation eines seriellen Bussystems und Verfahren zur Kommunikation in einem seriellen Bussystem

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DE102013214870A1 (de) * 2013-07-30 2015-02-05 Robert Bosch Gmbh Teilnehmerstation für ein Bussystem und Verfahren zur Verbesserung derFehlerrobustheit einer Teilnehmerstation eines Bussystems
DE102014204050A1 (de) * 2014-03-05 2015-09-10 Robert Bosch Gmbh Teilnehmerstation für ein Bussystem und Verfahren zur Verbesserung der Sendequalität in einem Bussystem
DE102014205120A1 (de) * 2014-03-19 2015-09-24 Robert Bosch Gmbh Teilnehmerstation für ein Bussystem und Verfahren zur Erhöhung der Übertragungskapazität in einem Bussystem
DE102014209694A1 (de) * 2014-05-21 2015-11-26 Robert Bosch Gmbh Teilnehmerstation für ein Bussystem und Verfahren zur Erhöhung der Störfestigkeit im Bereich der elektromagnetischen Verträglichkeit für eine Teilnehmerstation
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DE102015214399A1 (de) * 2014-07-31 2016-02-04 Denso Corporation Signalübertragungsschaltung

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DE102018202164A1 (de) 2019-06-27
CN111713078A (zh) 2020-09-25
CN111713078B (zh) 2022-08-09

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