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
  • H04L12/40032—Details regarding a bus interface enhancer
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
  • G06F13/38—Information transfer, e.g. on bus
  • G06F13/40—Bus structure
  • G06F13/4004—Coupling between buses
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L25/00—Baseband systems
  • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
  • H04L25/0264—Arrangements for coupling to transmission lines
  • H04L25/0272—Arrangements for coupling to multiple lines, e.g. for differential transmission
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L25/00—Baseband systems
  • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
  • H04L25/0264—Arrangements for coupling to transmission lines
  • H04L25/0278—Arrangements for impedance matching
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L25/00—Baseband systems
  • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
  • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
  • H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
  • H04L25/03834—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties using pulse shaping
• • 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
• • 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
  • H04L2012/40267—Bus for use in transportation systems
  • H04L2012/40273—Bus for use in transportation systems the transportation system being a vehicle

Definitions

• the present invention relates to a device and a method for selectively masking bus vibrations during data reception via a bus system in order to reduce the termination and topology of an increasingly inferior expert's opinion in the vehicle application
• the CAN bus system is used for communication between sensors and control units, for example in automobiles.
• messages are transmitted using the CAN protocol, as described in the CAN specification in IS011898.
• bit rate is the same in all protocol parts.
• the maximum bit rate is lMBi1 s, d. H.
• the bit time tbit is l s.
• CAN protocol namely CAN FD (CAN with flexible data rate)
• CAN FD CAN with flexible data rate
• Arbitration phase the data rate or bit rate for the following data phase on e.g. 2 MBit / s or 5 MBi1 s increased. This is accompanied by correspondingly shorter ones
• CAN bus system must be set up such that at least two subscriber stations or nodes, such as sensors or control units, etc., are each connected to a bus line with a spur line.
• the bus line is ideally one with each
• Terminating resistor terminated or terminated at the two bus line ends. Ideally, this topology does not show any transients when the bus state changes from dominant to recessive or vice versa. According to CAN Physical Layer Standard IS011898-2 / -5 / -6 is only this
• the nominal bit time N is divided into four phases, a Sync_Seg (N) phase, a Prop_Seg (N) phase, a phase Segl (N) phase, and a phase Seg2 (N) phase.
• the Sync_Seg (N) phase includes 1 / N of the nominal bit time N
• the Sync_Seg (N) phase includes 5 / N of the nominal bit time N
• Phase each comprise 4 / N of the nominal bit time N.
• the bit is sampled at the receiving subscriber station at a specifiable time within the nominal bit time N. This settable time is also called sample point or sample point.
• the sampling point is usually programmed between Phase_Segl and Phase_Seg2. Just if, at the time of the sampling point, the corresponding new bus state is present at the receiving node, it is also detected.
• a device and a method for selective hiding of bus vibrations during data reception via a bus system are to be provided, with which from a professional point of view increasingly inferiorly executed termination and topology of the CAN bus lines in the vehicle application can be compensated.
• the device for selectively hiding bus vibrations during data reception via a bus system with the features of claim 1.
• the device comprises a monitoring element for monitoring a difference of the bus signal on a bus line of the
• Bus system and a masking element for masking oscillations of the bus signal for a predetermined masking time when the
• Monitoring result of the monitoring element shows that oscillations of the bus signal after a transition of the bus signal from a dominant to a recessive state exceed at least a predetermined threshold.
• the device can also with a bus topology, which is executed from a professional point of view inferior than in the CAN physical layer standard IS011898-2 / -5 / -6, correct data reception is realized. This facilitates the manufacturing process of vehicles and intermediate controls in the manufacture of vehicles without the
• the device also provides the user of the bus system with a longer time within the bit time for a bit, which is shown for a dominant bit as tdom in the drawings, for parameterization or
• the device has a very low demand for silicon area and thus very low manufacturing costs.
• Another advantage of the device is that the device adapts to different applicators during the arbitration phase according to the CAN protocol or CAN FD protocol, such as bus topology and termination.
• the device can also be easily added to an existing bus system.
• Output of a receiving comparator is arranged, in whose at least two inputs, the difference of the bus signal is fed, and / or that the masking element is configured, a received signal driver of a
• the bit-rate calculation for a dominant bit and the masking time may be varied depending on whether the subscriber station acts as a receiver or as a transmitter of the bus signal.
• the monitoring element can be configured to reduce the number of
• Transgressions from a reception threshold to negative values of a signal generated from the bus signal as a precondition for counting on the masking element, and / or the monitoring element can be configured to count the number of transgressions of two reception thresholds or of three different reception thresholds.
• a first receive threshold has a lower voltage value than a second receive threshold
• the masking element is configured to mask oscillations of a signal generated from the bus signal for a predetermined masking time when the second receive threshold is exceeded less frequently than the first receive threshold.
• the monitoring element can be configured to check the number of excesses for negative values of the signal by means of a third reception threshold.
• the masking element can be designed to mask the digital received signal after a bit time only for the masking time when a state change from dominant to recessive occurs and the third reception threshold has been undershot.
• the device described above may be part of a transmitter / receiver module for a subscriber station for a bus system.
• the previously described transceiver module can be part of a
• the subscriber station can also have a CAN controller, and a system ASIC for receiving the transceiver module, wherein the previously described device between an output of a receiving comparator of the transceiver module and an input of a signal driver for a
• the bus signal is preferably constructed for the subscriber station in accordance with the CAN protocol and / or the CAN FD protocol and / or the TTCAN protocol.
• the device described above can also be part of a bus system which has a bus line and at least two subscriber stations, which are connected to one another by means of the bus line for communication.
• at least one of the subscriber stations can have the previously described device.
• the aforementioned object is also achieved by a method for selectively masking bus vibrations during data reception via a bus system having the features of claim 10.
• the method comprises the steps of: monitoring, with a monitoring element, a difference of the bus signal on a bus line of the bus system, and masking, with a
• Masking element oscillations of the bus signal for a predetermined masking time, when the monitoring result of the monitoring element shows that oscillations of the bus signal after a transition of the
• Bus signal from a dominant to a recessive state exceed at least a predetermined threshold.
• 1 is a simplified block diagram of a bus system according to a first embodiment
• Fig. 2 is a simplified block diagram of a subscriber station in the
• FIG. 3 shows an example of a part of a transmission signal TX of a subscriber station of the bus system of FIG. 1;
• Fig. 4 are bus signals CAN_H and CAN_L which are the sequence of the transmission signal TX of Fig. 3;
• Fig. 6 shows a receiver output REC_0 which is established at the subscriber station due to the transmission signal TX of Fig. 3;
• FIG. 8 shows a difference signal VDI FF resulting from the transmit signal TX of FIG. 3, on which additional receive thresholds are illustrated;
• FIG. 9 is a simplified block diagram of a bus system according to a second embodiment.
• the bus system 1 has a first subscriber station 10, a second subscriber station 20, a third subscriber station 30, a fourth
• Embodiment configured for a communication in which at least temporarily an exclusive, collision-free access of one of the subscriber stations 10 to 50 is ensured on the bus line 60.
• connections CAN_H, CAN_L which are connected to one another via resistors RL / 2 outside the CAN module, are provided on the transmission receiving module 10B.
• the connection of the two resistors RL / 2 can be connected to ground via a capacitor C and to a connection VSPLIT.
• the transmission receiving module 10B is connected to ground.
• the transmission receiving module 10B has a connection CAN_SUPPLY, via which a supply voltage for the transmission receiving module 10B with the value of 5V is fed via a filter 80.
• the transmission receive module 10B of the subscriber station 10 has an ESD protection unit 11, an optionally usable or existing VSPLIT unit 12, a transmission unit 13, a reception unit 14, a wake-up unit 15, which may also be referred to as wake-up logic, a digital unit 16 and an input / output unit 17.
• the transmitting unit 13 has, in addition to a not further described circuit of MOS-FETs and diodes a TxD driver or transmit signal driver 131.
• the receiving unit 14 has in addition to a not further described circuit of resistors one
• Bus biasing means 141 for receiving wake-up pulses, a receive comparator 143, and a
• the input / output unit 17 has a TX driver 171 and a RxD driver or receive signal driver 172.
• VDI FF is the analog differential voltage between the two bus lines CAN_H and CAN_L.
• VDI FF CAN_H - CAN_L applies.
• the receive comparator 143 Since two further receive thresholds RTH2 and RTH3 are now used to implement the invention in order to detect the amplitude of oscillations of the differential voltage VDI FF, the receive comparator 143 has three outputs to indicate the result of the threshold considerations.
• the device 144 monitors with its monitoring element 1441 (FIG. 8) during normal operation of the subscriber station 10 the up to three outputs 143A (FIG. 2) of the receive comparator 143. It is monitored via the monitor for a recessive state 95 (FIG. 6) for at least a dominant state time or bit time tdom (FIG. 7) a dominant bus state 96 (FIG. 6) has been established, as shown in FIG. 6 and FIG. 6)
• device 144 is in addition to the typical one
• the additional reception threshold RTH3 which checks for negative values of VDI FF, can additionally or solely be used as a precondition for activating the
• Subscriber stations 10, 20, 30, in which stronger vibrations are to be expected can be parameterized differently with regard to the masking properties.
• means 144 ( Figures 2 and 8) monitor the output of receive comparator 143 ( Figure 2). If a dominant level of the received signal RxD (FIG. 7) is present at the output for a bit time, each next state transition towards the recessive state is used to obtain the
• Fig. 9 shows a bus system 2 according to a second embodiment.
• the bus system 2 according to the second embodiment is largely constructed in the same manner as described with respect to the bus system 1 according to the first embodiment.
• the bus system 2 In contrast to the bus system 1 according to the first exemplary embodiment, however, the bus system 2 according to the second exemplary embodiment has two terminating resistors 70, which are respectively provided at the ends of the bus line 60. As a result, the bus system 2 forms a bus topology according to the CAN specification, as described in IS011898. Such
• the subscriber stations 10 to 50 are also constructed in the bus system 2 in the same way as with respect to the previous one
• the device 144 adapts to different applicators, such as bus topology and termination by terminators 70.
• Embodiments are arbitrarily combined or omitted.
• the bus system 1, 2, with the bus line 60 according to the embodiments is described based on a based on the CAN protocol bus system.
• the bus system according to the embodiments may be another type of communication network. It is advantageous, but not necessarily a prerequisite, that in the communication system 1 at the first
• Bus system is guaranteed at least for certain periods an exclusive, collision-free access of a subscriber station 10 to 50 to a common channel.
• the number of subscriber stations 10 to 50 is arbitrary. There may also be only two subscriber stations of the subscriber stations 10 to 50. Only subscriber stations 10 or subscriber stations 20 or subscriber stations 30, etc. may also be present in the bus system 1, 2.
• the device 144 does not have to be part of the CAN module of one of the
• Subscriber stations be 10 to 50.
• the device 144 may also be provided as a separate device externally from the CAN module of one of the subscriber stations 10 to 50. This is particularly advantageous for retrofitting for an existing CAN bus system 1, 2.

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• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Power Engineering (AREA)
• Physics & Mathematics (AREA)
• General Engineering & Computer Science (AREA)
• Theoretical Computer Science (AREA)
• Spectroscopy & Molecular Physics (AREA)
• Computer Hardware Design (AREA)
• General Physics & Mathematics (AREA)
• Small-Scale Networks (AREA)
• Dc Digital Transmission (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 2015
  • 2015-11-12 DE DE102015222334.5A patent/DE102015222334A1/de active Pending
• 2016
  • 2016-11-07 CN CN201680066048.XA patent/CN108353012B/zh active Active
  • 2016-11-07 KR KR1020187016135A patent/KR102681598B1/ko active IP Right Grant
  • 2016-11-07 US US15/772,170 patent/US10454705B2/en active Active
  • 2016-11-07 EP EP16791400.1A patent/EP3375149A1/de not_active Withdrawn
  • 2016-11-07 WO PCT/EP2016/076778 patent/WO2017080938A1/de active Application Filing
  • 2016-11-07 JP JP2018524384A patent/JP6788670B2/ja active Active

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