EP2771950B1 - Vehicle electrical system component for a data transmission system in a motor vehicle - Google Patents

Description

The invention relates to an on-board network component for a data transmission system in a motor vehicle, in particular for an Ethernet transmission system or BroadR-Reach technology.

Modern data transmission in a motor vehicle requires special cables, which are adapted to the motor vehicle requirements and optimized in the transmission behavior. Standard solutions from the consumer sector are suitable only to a limited extent due to the heavily EMC-stressed vehicle electrical system of today's motor vehicles.

For high-speed data transmission (HSD), for example, star quad cables (quad cables) are known, which have two symmetrical wire pairs in a sheathed cable. The individually insulated wires are arranged in the shape of a star quad and stranded together. To the wires then a common shield is arranged. On a plug, the wires are then connected to wire connection contacts and contacted the shield of the cable with a shield plate in the plug. Such on-board network components are suitable for transmitting data streams according to LVDS (Low Voltage Differential Signal), but also according to USB, Ethernet, GVIF (Gigabit Video Interface) or IEEE 1394 specification. Another technology for transmitting data over wire pairs is BroadR-Reach technology from Broadcom.

Such data transmission systems are relatively expensive and expensive.

The invention is based on the technical problem of providing an on-board network component for a data transmission system in a motor vehicle, in particular for an Ethernet transmission system or BroadR-Reach transmission system, which is simpler in design and in assembly.

The solution of the technical problem results from the subject matter with the features of claim 1. Further advantageous embodiments of the invention will become apparent from the dependent claims.

For this purpose, the vehicle electrical system component for a data transmission system in a motor vehicle comprises a cable with wires and a plug with wire connection contacts to Contacting the wires, wherein the wires have an electrical insulation, wherein the wires are arranged around a common shield, which is surrounded by a common cable sheath, wherein the cable has exactly three wires and an electrically conductive Beilauflitze, the Beilauflitze at least partially shielding contacted and contacted with a wire terminal of the plug. This makes it possible to dispense with an expensive contacting of the shield on a shield plate of the plug. The shielding can be designed as a cost-effective foil screen, so that can be dispensed with expensive braid shields. The alleged disadvantage that there is no longer any shielding in the area of the plug is negligible, since this does not result in any functional restriction in the data rates and signal shapes defined in accordance with Ethernet as well as in conventionally occurring numbers of coupling points in a motor vehicle. The data transmission takes place via a pair of wires, whereas via the third wire a supply voltage and the Beilauflitze the ground are provided, ie the cable has exactly three wires.

According to the Beilauflitze is twisted with the three wires in the cable, which has advantages in the transmission behavior.

In a further embodiment, the diameter of the Beilauflitze is equal to the insulation diameter of the other individual wires, which in particular simplifies the twisting and advantageous for the symmetry of the line from a mechanical and electrical point of view.

In this case, the diameter of the Beilauflitze can also be chosen slightly smaller, so that this example is between 80 - 100% of the insulation diameter of the other wires.

In a further embodiment, the Beilauflitze on a copper core, on which an electrically conductive coating is applied, wherein the total diameter including the electrically conductive coating the same or a slightly smaller diameter (80 - 100%), as the insulation of the other wires. As stated earlier, this structure is advantageous for the symmetry of the line from a mechanical and electrical point of view. The electrically conductive coating can be tin or zinc, for example. This saves on the one copper and on the other hand, this also improves the twist, since the cross section of the copper core in the individual wires and the Beilauflitze is the same. The electrically conductive coating can also be an electrically conductive plastic, which has a cost-reducing effect and makes it possible to use similar material in the three individual wires as well as the fill-strand of the twisting behavior.

In a further embodiment, the wire connection contact for the extension cord in the plug is matched to the diameter of the drain wire. By this is meant that the wire connection contact must be suitable for connecting larger diameters, since the diameter of the Beilauflitze is greater than the copper core of the wires. This results in an uncertain imbalance in the plug.

Alternatively, the electrically conductive coating of Beilauflitze be removed at the wire connection contact of the plug, so that all wire connection contacts can be built the same. This causes a little more effort during assembly, but simplifies the construction of the plug.

In a further embodiment, the plug has a shielding plate. The advantage of the plug with shield plate is its mechanical stability. Thus, a conventional HSD connector can be used, but the shield plate is not contacted. Another advantage is that correspondingly the sockets of a control unit do not need to be adapted, in which the vehicle electrical system component is to be plugged. Alternatively, the shielding plate can be replaced by a plastic part of the same geometry. Thus, advantageously, parts of an existing plug-in system can continue to be used. In new constructions, however, the plastic surrounding housing can also be designed by means of a suitable tool design in such a way that the geometry of the former shielding sheet is integrally formed thereon from plastic.

Fig. 1

ein Querschnitt durch ein Kabel in einer ersten Ausführungsform,

Fig. 2

ein Querschnitt durch ein Kabel in einer zweiten Ausführungsform,

Fig. 3

ein Querschnitt durch ein Kabel nach einem Vergleichsbeispiel, das nicht unter die Ansprüche fällt,

Fig. 4

eine Explosionsdarstellung eines Steckers,

Fig. 5

eine perspektivische Rückansicht eines Steckers und

Fig. 6

eine schematische Verschaltung einer Bordnetzkomponente mit einem Steuergerät.

The invention will be explained in more detail below with reference to a preferred embodiment. The figures show:

Fig. 1

a cross section through a cable in a first embodiment,

Fig. 2

a cross section through a cable in a second embodiment,

Fig. 3

a cross section through a cable according to a comparative example, which does not fall under the claims,

Fig. 4

an exploded view of a plug,

Fig. 5

a perspective rear view of a plug and

Fig. 6

a schematic interconnection of a vehicle electrical system component with a control unit.

In the Fig. 1 is shown schematically a cross section of a cable 1 in a first embodiment. The cable 1 comprises three wires 2-4 and one Beilauflitze 5. The three wires 2-4 and the Beilauflitze 5 are surrounded by a common shielding 6, which is formed as a film screen. To the shield 6 is an insulating cable sheath 9, which also represents a mechanical protection. The wires 2-4 each have an insulation 7 and a copper core 8. The Beilauflitze 5 is also made of copper. The copper cores 8 of the cores 2-4 have, for example, a cross-sectional area of 0.14 mm ² . For example, the wires 2-4 themselves have a cross-sectional area of 0.35 mm ² . The Beilauflitze 5 has the same cross-sectional area, as the wires 2-4, so for example, 0.35 mm ² . The shield 6 is applied to the wires 2-4 and the Beilauflitze. The wires 2-4 and the drain wire 5 are twisted in the cable 1 in the longitudinal direction. In this case, two wires and one wire and the drain wire 5 can be twisted in pairs or all three wires 2-4 and the auxiliary wires 5 are all twisted together, as in a quad-line. Due to the fact that the diameter of the cores 2-4 is equal to that of the Beilauflitze 5, these can very easily be twisted together. In this case, the auxiliary slits 5 is applied to the shielding 6. It should be noted that between the wires 2-4 and the Beilauflitze 5 centrally an insulating filler can be arranged, which serves in particular the mechanical stability and the leadership of the wires 2-4.

In the Fig. 2 an alternative embodiment is shown The only difference of the cable 1 in comparison with the embodiment according to Fig. 1 is that the Beilauflitze 5 is not made entirely of copper, but has a copper core 10 and an electrically conductive coating 11, which consists for example of tin, zinc, a copper-tin or copper-zinc alloy. Also electrically conductive plastics are conceivable as a coating of the copper core. The copper core 10 preferably has the same diameter as the copper cores 8 of the cores 2-4. The advantage is that the electrically conductive coating 11 is less expensive, wherein the electrical properties for contacting the shield 6 are sufficient.

In the Fig. 3 Finally, a cable 1 according to a comparative example, which does not fall under the claims illustrated. The cable 1 is an unshielded cable 1 and has four wires 2-4, 12, each having a copper core 8 and an insulation 7.

In the 4 and 5 is an example of a plug 13 for one of the cables 1 according to the Fig. 1 to 3 shown. The plug 13 comprises a housing 14 with lock 15, four wire connection contacts 16, a plastic receptacle 17 for the wire connection contacts 16 and a shield plate 18. It should be noted that the shield plate 18 can be omitted without replacement or can also be replaced by a plastic part. The wire connection contacts 16 are used to connect the wires 2-4, 12 and the Beilauflitze 5 and are designed as crimp contacts. To produce an electrical contact, the insulation 7 of the wires 2-4, 12 is removed and the copper core 8 is crimped with the crimp contact. When connecting a cable 1 according to Fig. 1 Therefore, the crimp contact must be chosen slightly larger for Beilauflitze 5 than for the wires 2-4. Accordingly, the opening for the crimp contact of the Beilauflitze 5 in the plastic receptacle 17 must be slightly larger than selected for the other wire connection contacts 16. The statements apply mutatis mutandis to the contacting of a cable 1 according to Fig. 2 if the electrically conductive coating 11 of the fill-in strand 5 is not removed before crimping. On the other hand, if this is removed, then all four wire connection contacts 16 can be of identical design and correspondingly also all the openings of the plastic receptacle 17. When connecting a cable 1 according to FIG Fig. 3 are all wire connection contacts 16 and all openings of the plastic receptacle 17 equal. The shield plate 18 according to the invention has no electrical function, but only a mechanical stability function, and therefore may also be made of plastic or omitted entirely. The shield plate 18 is formed substantially cylindrical. It should also be noted that the plug 13 may also be formed as an angle plug and both sealed and unsealed.

In the Fig. 6 schematically the interconnection of a vehicle electrical system component 20 consisting of cable 1 and plug 13 is shown with a control unit 30. The control unit 30 comprises a housing 31 which is connected to the vehicle mass 32. Further, the controller 30 includes a socket 33 and a microprocessor 34 having a positive supply voltage terminal and a negative supply voltage terminal connected to the vehicle ground 32. In this case, the wire-splicing contact 5 assigned to the auxiliary connecting wire 16 is connected to the negative supply voltage terminal, so that the shielding 8 (see FIG Fig. 1, 2 ) is connected to the vehicle mass 32. The diagonally opposite wires 2, 4 are used for data transmission from or to the microprocessor 34 and the wire 3 is used for power supply and is connected to the positive power supply terminal of the controller 30 connected.

The advantage is that the cable construction is very simple and the installation between cable and plug is simplified, where necessary, can be used on existing HSD connector. The twisting of the wires in the cable and the untwisting on the plug can be carried out with the existing machines.

LIST OF REFERENCE NUMBERS

1

electric wire

2-4

veins

5

drain wire

6

shielding

7

insulation

8th

copper core

9

cable sheath

10

copper core

11

electrically conductive coating

12

Vein

13

plug

14

casing

15

lock

16

Cable termination Contact

17

Plastic frame

18

shroud

20

Board network component

30

control unit

31

casing

32

vehicle mass

33

Rifle

34

microprocessor

Claims (6)

1. A vehicle electrical system component (20) for a data transmission system in a motor vehicle, in particular for an Ethernet transmission system, comprising a cable (1) having wires (2-4) and a plug (13) having wire connection contacts (16) for contacting the wires (2-4), wherein the wires (2-4) have an electrical insulation (7), wherein a common shielding (6) is arranged around the wires (2-4), which is enclosed by a common cable sheath (9), wherein the cable (1) has at least three wires (2-4) and an electrically conductive drain wire (5), wherein the drain wire (5) contacts the shielding (6) at least in sections and is contacted to a wire connection contact (16) of the plug (13),
   characterized in that
   the cable (1) has exactly three wires (2-4), wherein the drain wire (5) is twisted with the three wires (2-4), wherein the data transmission takes place via two wires (2, 4), the third wire (3) is connected to the supply voltage and the drain wire (5) is connected to ground.
2. The vehicle electrical system component according to Claim 1, characterized in that the diameter of the drain wire (5) is equal to the diameter of the wires (2-4).
3. The vehicle electrical system component according to Claim 2, characterized in that the drain wire (5) has a copper core (10), to which an electrically conductive coating (11) is applied, wherein the electrically conductive coating (11) has the same diameter as the insulations (7) of the wires (2-4).
4. The vehicle electrical system component according to any one of Claims 2 or 3, characterized in that the wire connection contact (16) for the drain wire (5) in the plug (13) is adapted to the diameter of the drain wire (5).
5. The vehicle electrical system component according to Claim 3, characterized in that the electrically conductive coating (11) of the drain wire (5) on the wire connection contact (16) of the plug (13) is removed.
6. The vehicle electrical system component according to any one of the preceding claims, characterized in that the plug (13) has a shielding plate (18) or a plastic part replacing a shielding plate (18).

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