• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    9SammandraciA communication bus (B1, B2, Bp) in a motor vehicle (110), is arranged to transmit electrical signals between nodes entering the motor vehicle (N1, N2, N3, Nn, N21, N2m, Np1, Nix). CommunicationsThe transmission bus comprises two unshielded signal conductors (Si, S2) and onedecoupling conductor (D), which is configured to dissipate unwanted electromagnetic straining harrowing from saval external systems which are not connected to the communication bus (B1, B2, Bp) as those via the unshielded signal conductors (Si, S2)the signals. The decoupling conductor (D) is connected in terms of AC voltage to a ground potential in one and only one (N3) of the nodes entering the communication system (N1, N2, N3, Nn, N21, N2m, Np1, Npr) •(Fig. 1)
    公开号:SE1351263A1
    申请号:SE1351263
    申请日:2013-10-24
    公开日:2015-04-25
    发明作者:Sune Gustafsson；Jörgen Sundberg；Thomas Lundqvist
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    Communication bus for motor vehiclesBACKGROUND OF THE INVENTION AND PRIOR ARTThe present invention relates generally to communication in motor vehicles. In particular, the invention relates to a communicationbus according to the preamble of claim 1 and a motor vehicle according tothe preamble of claim 7.
    In modern motor vehicles, information is exchanged between units and control of various functions is usually done with the help of communication buses. Of course, it is important that theyThe OverfOrda signals are not distorted at the OverfOrda signalsas this would jeopardize the function and safety of the vehicle. It is also important that a communication bus does not radiate, or otherwise paint electromagnetic energy in such a way that other units inside or outside the vehicle riskstOras or completely knocked out. Today, there are various examples ofto alleviate this type of problem.
    For example, US 5,513,218 discloses a serial communication bus in a motor vehicle, in which case a compensation circuit prevents the occurrence of maladaptations which would otherwise riskdistort signal pulses on the bus and cause unwanted radiation from there. The compensation circuit includes an integrator, which simulates the ground voltage cla the line ground voltage Exceeds the voltage of the sanding node. Between the signal pulses being deactivated, the sanding node has to avoid thatthe line voltage rises further. If, however, the sandingthe voltage of the node falls below the line ground voltage, the sanding node remains active even between the signal pulses in order to increase the potential of the line ground voltage.
    US 6,031,823 reports on a vehicle communication network includedincluding a circuit for earth translation and for constituting oneinterfaces to transmitter circuits for the purpose of achieving smooth transitions. A communication bus is adapted to be connected to2a plurality of sand traps, where the usual sand traps are connected via a resistive element and supply current to the bus when the sanding voltage exceeds the bus voltage. The added resistance reduces the current changes which would otherwise occur.get on the bus in connection with power calls being turned off andPa.
    Furthermore, it is edge to surround the signal cables in a communication bus with a shield, which in turn is grounded in direct voltage in one of the nodes of the network, while the shield in all other nodes isdast grounded AC voltage. This means that unwantedstraining of electromagnetic energy from the signal cables can be limited very effectively.
    PROBLEM ASSOCIATED WITH PREVIOUS KAND TECHNIQUEHowever, the latter strategy is both expensive and technicalcomplex to implement in a vehicle environment, sinceThe cation bus often has relatively many connection points to the bus and the screen must be kept intact past all these connection points.
    SUMMARY OF THE INVENTIONThe object of the present invention is therefore to provide oneSolve the above problems and offer a simple and cost-effective way to communicate via a bus in a motor vehicle, without risking the unwanted impact of other devices inside your own vehicle or outside the vehicle due to lacking electricalmagnetic straining.
    According to one aspect of the invention, the object is achieved by the communication bus initially described, wherein the disconnection conductor is connected in terms of AC voltage to a ground potential in one and only one of those in the communication system.end nodes.3This communication bus is advantageous because it has been found to provide a shielding of the signal conductors corresponding to that obtained if these had been surrounded by a conventional shield even if, for example, the disconnection conductor consisted only ofa simple single-wire wire which is wound around the signal conductors.
    According to an embodiment of this aspect of the invention, the disconnection conductor is connected in terms of alternating voltage to the ground potential in the node which is at a geometrically most central position of those entering the communication system.the nodes. This achieves the most effective possible reduction ofelectromagnetic straining from the communication bus.
    According to another embodiment of the aspect of the invention, the unshielded signal conductors are connected in terms of alternating voltage to a ground potential in each of the nodes. This givenamely an effective balancing at the same time as thegrounding is not affected.
    According to a further embodiment of it has the aspect of the invention, the unshielded signal conductors are intertwined with each other, for example in the form of a twisted two-wire conductor. Thisalso provides a cost-effective and simple implementation. Furthermore, the disconnection conductor is suitably twisted together with the signal conductors.
    According to another aspect of the invention, the object is achieved by the motor vehicle initially described, wherein the communicationThe connection connection in the motor vehicle comprises the proposedthe communication bus. The advantages of this motor vehicle, said choice as with the preferred embodiments clarav, are outlined by the discussion above with reference to the proposed communication bus.
    BRIEF DESCRIPTION OF THE DRAWINGSThe present invention will now be explained in more detail by means of embodiments, which are described by way of example, and by way of reference.4display to the accompanying drawings.
    Figure 1 shows a schematic view of a motor vehicle including a communication bus according to a first embodiment of the invention; andFigure 2 shows a number of communication buses which are connectedcoupled according to an embodiment of the invention.
    DESCRIPTION OF EMBODIMENTS OF THE INVENTIONReferring first to Figure 1, there is shown a schematic view of a motor vehicle 110 including a first communication device.bus B1 according to a first embodiment of the invention. Figure 2 shows a further number of communication buses B2, ..., Bp, which are connected to the first communication bus B1 according to an embodiment of the invention. The communication buses B1, B2, ..., Bp can, for example, be designed totransmit CAN (Controller Area Network) signals.
    The communication bus B1 is in all transactions configured to transmit electrical signals between a number of nodes, has N1, N2, N3, ..., No., which are part of a communication system in the motor vehicle 110. The communication bus B1, in turn, comprises twomade signal conductors Si and S2 and a relaxation conductor D. Giventhat the communication bus B1 is of the CAN type, a first signal conductor Si can constitute a so-called CAN high conductor and a second signal conductor S2 constitute a so-called CAN / ow leader.
    The unshielded signal conductors S1 and S2 are configured toinformation between nodes N1, N2, ..., Nn by means of a dif-feral (balanced) signal. The relaxation conductor D is configured to provide unwanted electromagnetic straining. This straining can be obtained from the unshielded signal conductors S1 and S2 as well as from external systems, i.e. signal sources whichare not connected to the communication bus Bl.
    According to the invention, the decoupling conductor D is the alternating voltageconnected to a ground potential in one and only one of the nodes entering the communication system, said the node N3. This meant that the unshielded signal conductors Si and S2 achieve a good balancing against the ground (so-called common mode rejection) and that evenpotential disturbances are effectively led away to earth. Figure 2 illustratesAC voltage ground connection of decoupling conductor D with a schematic resistor and a schematic capacitance between decoupling conductor D and ground. In a real implementation, the resistance and the capacitance are chosen so that a good adaptationto the communication bus B1, B2 and Bs, respectivelyimpedance properties.
    For cost reasons and in order to achieve a simple construction of the communication bus and its connections, the disconnection conductor D is advantageously unshielded, as e.g.centered by a simple insulated cable.
    According to a preferred embodiment of the invention, the decoupling conductor D is connected in terms of alternating voltage to the earth potential in the very node that has N3, which is in a geometrically most central position of those in the communication system.the ending nodes, the viii saga of the nodes N1, N2, N3, .., Nn iFigure 1 and Ni, N2, N3, .., N21, ..., N2m, Np1, ..., Npr in Figure 2. Such a ground connection has in fact been shown to give the aura best balancing against ground and thus the most effective interference leaching. . Because it can be black to predict exactly howa particular motor vehicle 110 may be configured at theand / or modified after delivery, it is advantageous if several other nodes, i.e. all nodes, are prepared for alternating voltage connection of the decoupling conductor D to the ground potential. This means that the earth connection point can be usedand moved depending on what turns out to be, or become,the geometrically most central position in the vehicle's communication system.
    Each of the unshielded signal conductors S1 and S2 is suitably connected in terms of AC voltage to the ground potential in each and every6one of the nodes N1, N2, N3, ..., Nn, N21, ..., N2m and Np1, ..., Npr. This is illustrated in Figure 2 with schematic resistances and capacitances between the signal conductor and earth.
    Furthermore, it is advantageous if the unshielded signal conductors Si andS2 are intertwined with each other. They can thus be made up of a twisted twin line leader. According to a preferred embodiment of the invention, the decoupling conductor D is also twisted together with the signal conductors S1 and S2. The communication bus B1, B2 and / or Bp can thus be represented by a twisted three-lineleader.
    The invention is not limited to the embodiments described with reference to the figures but can be varied freely within the scope of the following claims.
    权利要求:
    Claims (7)
    [1]
    A communication bus (B1, B2, Bp) for a motor vehicle (110), wherein the communication bus (B1, B2, Bp) is configured to transmit electrical signals between nodes (N1, N2, N3, Nn, Nn, input) in a communication system in the motor vehicle. N21, N2m, Np1, Npr), which communication system includes at least two nodes, the communication bus comprising two unshielded signal conductors (Si, S2) and a decoupling conductor (D) configured to divert unwanted electromagnetic straining from at least either of external systems which are not connected to external systems. the communication bus (B1, B2, Bp) and the via the unshielded signal conductors (Si, S2) Transmit the electrical signals, characterized in that the decoupling conductor (D) is connected in terms of AC voltage to a ground potential in one and only one (N3) of those in communication system input nodes (N1, N2, N3, Nn, N21, N2m, Np1, Npr).
    [2]
    The communication bus (B1, B2, Bp) according to claim 1, wherein the node (N3) of said nodes in which the decoupling conductor (D) is connected to the ground potential in terms of AC voltage is the node which is at a geometrically most central position of those in the communication system in the nodes (N1, N2, N3, Nn, N21, N2m, Np1, Npr).
    [3]
    The communication bus (B1, B2, Bp) according to any one of claims 1 or 2, wherein the unshielded signal conductors (Si, S2) are connected in terms of alternating voltage to a ground potential in each of the nodes (N1, N2, N3, Nn, N21, N2m, Np1, Npr).
    [4]
    The communication bus (B1, B2, Bp) according to any one of the preceding claims, wherein the disconnection conductor (D) is unshielded.
    [5]
    The communication bus (B1, B2, Bp) according to any one of the preceding claims, wherein the unshielded signal conductors (Si, S2) are twisted together.
    [6]
    The communication bus (B1, B2, Bp) according to any one of claims 48 or 5, wherein the disconnection conductor (D) is intertwined with the signal conductors (Si, S2).
    [7]
    A motor vehicle (110) comprising: a communication system including at least two nodes (N1, N2, N3, Nn), and a communication connection arranged to enable information exchange between the nodes entering the communication system (N1, N2, N3, Nn), in that the communication connection comprises the communication bus (B1) according to any one of the preceding claims. 1/1 1 N2 B1
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1351263A|SE537570C2|2013-10-24|2013-10-24|Communication bus for motor vehicles|SE1351263A| SE537570C2|2013-10-24|2013-10-24|Communication bus for motor vehicles|
    EP14855148.4A| EP3061217B1|2013-10-24|2014-10-07|Communication bus for motor vehicle|
    US15/030,440| US9975503B2|2013-10-24|2014-10-07|Communication bus for motor vehicle|
    PCT/SE2014/051173| WO2015060765A1|2013-10-24|2014-10-07|Communication bus for motor vehicle|
    RU2016119002A| RU2643794C2|2013-10-24|2014-10-07|Communication bus for motor vehicle|
    BR112016006915A| BR112016006915A2|2013-10-24|2014-10-07|motor vehicle communication bus|
    KR1020167011402A| KR101867547B1|2013-10-24|2014-10-07|Communication bus for motor vehicle|
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