DE102016209370A1 - Control device and method for transmitting data packets between an Ethernet network and a timed bus network, in particular in a motor vehicle - Google Patents

Abstract

The invention relates to a method for transmitting data packets (17) between an Ethernet network (14) and a timed bus network (15) by means of a control device (16), wherein a plurality of queues (25) for buffering the data packets (17) provided and the queues (25) are coupled to the Ethernet network (14) via a respective controllable inhibit gate (26) and the inhibit gates (26) are opened according to a cyclically-passed checklist (28). The invention provides that the data packets (17) are transmitted in the bus network (15) according to a predetermined transmission schedule, so that a respective relative time interval (35) between the data packets (17) is predetermined, and by a selection unit (32 ) one of the queues (25) is selected for each of the data packets (17) and the data packet (17) is temporarily stored in the selected queue (25) and the control list (26) is set in the control device (16) such that upon transmission the data packets of the respective relative time interval (35) of the data packets (35) is maintained.

Description

The invention relates to a method for transmitting data packets between an Ethernet network and a timed bus network, for example a FlexRay cluster or FlexRay network. To send and / or receive the data packets over the Ethernet network, queues or queues are used, which are switched by means of a checklist. This can, for example, according to the Standard IEEE 802.1Qbv be realized. The invention also includes a control device for carrying out the method according to the invention. The method is preferably carried out in a motor vehicle. Accordingly, the invention also includes a motor vehicle with the control device according to the invention.

The standard Ethernet is currently being used in the on-board systems or communication networks of motor vehicles. With the Ethernet, it is possible to transport or transmit non-safety-critical multimedia data together with safety-critical data and control data in a common communication network.

In this case, the quality of service of the transmission must be ensured for the transport or transmission of safety-critical data, for example for controlling an antilock braking system. The quality of service describes in a vehicle electrical system communication parameters, such as the start-up time, the latency, the response time and / or the availability of the network. Only with sufficient quality of service is it ensured that, for example, a driver assistance system reacts in good time to a danger detected by sensors.

However, the Ethernet is a so-called switched network, which does not work with fixed transmission guarantees. Therefore, so far one has relied on bus networks, such as the MOST (Media Oriented Systems Transport) or a FlexRay network. Because a bus network has the advantage that it is time-controlled and thus data packets are guaranteed transmitted according to a predetermined schedule.

In a transitional phase, it is to be expected that both an Ethernet network and a bus network, such as a FlexRay network or a CAN, will be used in a motor vehicle and data packets must be transmitted between these two networks. The implementation can take place via a so-called gateway, ie a control device to which both the Ethernet network and the bus network can be connected. For this purpose, such a control device on the respective physical interface or connection and the respective required protocol stack for communication or data exchange over the respective network.

One hitherto unresolved and insufficiently addressed challenge in the development of such a control device is to maintain the relative time intervals, as provided by the schedule of a timed bus network between the data packets, even within an Ethernet network.

One solution for reconstructing the relative time intervals after transmission over an Ethernet network is the DE 10 2012 223 308 A1 known.

The invention has for its object to obtain in a communication network with an Ethernet network and a timed bus network, the quality of service of the bus network in the transport of data packets over the Ethernet network.

The object is solved by the subject matters of the independent claims. Advantageous developments of the invention are described by the dependent claims, the following description and the figures.

The invention provides a method for transmitting data packets between an Ethernet network and a timed bus network. The method is carried out by means of a control device which, as a so-called gateway, can connect the Ethernet network to the bus network. The data packets may include, for example, sensor data from a sensor device of a motor vehicle and / or control data for actuators of the motor vehicle. As a time-controlled bus network, for example, a FlexRay network can be operated. The bus network can also be a CAN.

With regard to the transmission and / or reception of the data packets via the Ethernet network, the method provides that the control device provides several queues for buffering the data packets. Another name for such a queue is Queue. The queues are coupled to the Ethernet network via a respective controllable gate or gate. The blocking gates are opened for passing data packets between the respective queue on the one hand and the Ethernet network on the other hand, according to a cyclically checked checklist, so switched permeable. Otherwise they stay closed, so switched off. A blocking gate can thus be switched between an open state and a blocking state. In the opened state, a queued data packet can be output to the Ethernet network or a data packet received from there can be queued. In the blocking state, the exchange of a data packet between the queue and the Ethernet network is blocked. The transmission between a queue with an open blocking gate on the one hand and the Ethernet network on the other hand can be done for example by a scheduler. In order to operate the Ethernet network with queues and blocking gates, provision is made in particular for the Ethernet network to be controlled in accordance with a TSN standard (TSM). In particular, the Standard IEEE 802.1Qbv intended. A blocking gate can be realized by means of a software module.

In order to transmit data packets of a time-controlled bus network with the quality of service of the bus network with this Ethernet network, the following method steps are provided. The method assumes that the data packets in the bus network are transmitted according to a predetermined schedule, so that a respective relative time interval between the data packets results or is predetermined. In the control device, one of the queues is selected by a selection unit or a packet parser for each of the data packets that may arrive in the control device according to a distribution plan provided. Which data packet is concerned can be determined, for example, on the basis of a time of arrival and / or on the basis of a sender ID and / or a message ID and / or a message type of the data packet. The data packet is then cached for transmission between the Ethernet network and the bus network in the selected queue. The method is suitable for both directions of transmission. In other words, a data packet arriving via the bus network can first be temporarily stored in the selected queue and then forwarded to the Ethernet network by opening the associated blocking gate. Conversely, an incoming via the Ethernet network data packet can be forwarded by opening the blocking gate in the selected queue and then removed from there by the selection unit and sent out or forwarded to the bus network according to the transmission schedule. In the control device, the control list is accordingly set in such a way that the respective relative time interval of the data packets is retained when transmitting the data packets.

The distribution plan implemented by the selection unit therefore makes it clear in which queue which of the data packets lies. By controlling the blocking gates by means of the checklist, the data packets are then forwarded according to the desired time intervals. Thus, the data packets have the correct time intervals when they are sent to the Ethernet network. When receiving from the Ethernet network, the data packets are cached in the designated queue so that they are ready in time and in the correct queue when the data packets need to be forwarded to the bus network.

The advantage of the method according to the invention is that the relative time intervals between the data packets within the Ethernet network are also set in the manner specified by the transmission schedule of the bus network. Despite the fact that this is not a time-controlled bus network, the Ethernet network behaves like a time-controlled bus network when transmitting the data packets. Thus, the quality of service of a timed bus network can also be provided by means of the Ethernet network. In the context of the invention, only relative time intervals are mentioned, since the transmission by the control device can cause a time offset, but is the same for all data packets (except for a predeterminable, in particular insignificant, jitter).

The invention also includes advantageous developments, the characteristics of which provide additional advantages.

In order to determine the distribution plan and the check list, the transmission schedule of the bus network is preferably used or assumed, so that a respective transmission time of each of the data packets is determined from the transmission schedule. The said cyclically checked check list for the blocking gates requires a so-called cycle duration for a pass. The cycle duration is preferably set such that it corresponds to a total duration of at least one cyclically repeated base cycle of the bus network. For example, the said FlexRay network has 64 basic cycles which may differ from one another. Thereafter, the first base cycle is started again. Thus, in this case, the cycle time of the control list is 64 times the duration of the basic cycle of the FlexRay network. Each basic cycle has time slots in each of which one of the data packets in the bus network can be sent. The transmission schedule determines in which time slot which data packet is to be sent. For at least one of these timeslots, especially for some or all timeslots, a corresponding combination of a free queue for caching the data packet in the controller and a gate control time for the free-queue bar gate is determined. It is therefore checked whether whenever a data packet arrives in its time slot in the control device, a queue is ready in which the data packet can be stored in such a way that it is sent out by setting a gate control time at the right time in the Ethernet network can, so that the said intervals of the data packets are preserved. A data packet does not have to be forwarded immediately or sent out to the Ethernet network. It suffices if the said constant time offset results overall for all data packets.

An entry in the distribution plan is then preferably generated for the determined free queue. For the gate control time, an entry is accordingly generated in the checklist, by which the blocking gate is opened. In this way, all data packets which are to be transmitted cyclically in the at least one basic cycle of the bus network are then automatically transmitted on the basis of the distribution plan and the check list also in the Ethernet network according to the transmission schedule.

A particularly preferred source for determining the transmission schedule is a Fibex data set from which the distribution plan and the checklist can be generated with little technical effort.

An Ethernet network can have a plurality of network branches, which are provided via at least one switch unit for forwarding the data packets between the network branches. Under a switch unit is here in particular a so-called switch or a so-called bridge to understand. It is preferably provided that the predetermined time intervals between the data packets also remain within the Ethernet network when transmitted via at least one switch unit. In each switch unit are preferably also provided queues and each a checklist for the blocking gate. It is then provided that the checklist of each switch unit is set in dependence on the control list of the control device such that the relative time interval of the data packets within the Ethernet network is maintained. For this purpose, for example, starting from the control device and according to the circuit diagram of the Ethernet network, the next or downstream switch unit can be determined and in this the control list can be adapted to the control list of the control device. Then, starting from this switch unit, the nearest or downstream switch unit can be determined and its checklist adjusted. This results in a recursive or iterative adaptation of the checklists in the Ethernet network.

The mapping of a transmission schedule of a bus network to an Ethernet network requires that the transmission times for the data packets can be set sufficiently flexibly in the Ethernet network. Preferably, therefore, it is verified whether the data packets sent according to the transmission schedule, in combination with a respective data volume of the data packets, i. whose amount of data results in a data rate that is less than or equal to a maximum data rate of the Ethernet network. In other words, the total amount of data resulting from the number of data packets multiplied by their data volume or size is determined. Together with the transmission schedule results in the required data rate. If the required data rate is greater than the maximum data rate provided by the Ethernet network, an error signal is generated. This signals that it is impossible to map or implement the transmission schedule of the bus network using the Ethernet network.

In order to carry out the method according to the invention, the invention provides a control device for coupling at least one Ethernet network to a bus network. The control device thus constitutes a so-called gateway. The control device has a processor device with program code which is set up to execute an embodiment of the method according to the invention when executed by the processor device. The program code may be stored in a data memory of the processor device. To execute the program code, the processor device may have at least one microprocessor and / or at least one microcontroller.

The invention also includes a motor vehicle with at least one Ethernet network and with at least one bus network. The at least one Ethernet network and the at least one bus network are coupled or interconnected via an embodiment of the control device according to the invention.

It is preferably provided that at least one sensor device of the motor vehicle is coupled to at least one actuator of the motor vehicle via the networks, in which case said data packets contain or include sensor data and / or control data for actuators.

The motor vehicle according to the invention is preferably designed as a motor vehicle, in particular as a passenger car or truck.

In the following an embodiment of the invention is described. This shows:

1 a schematic representation of an embodiment of the motor vehicle according to the invention;

2 a schematic representation of a control device of the motor vehicle of 1 ;

3 a schematic representation of queues and a checklist that in the control device of 2 can be provided;

4 a schematic representation of a transmission of data packets from a bus network in an Ethernet network by means of the control device;

5 a Flußschaudiagramm illustrating an embodiment of the method according to the invention;

6 a flowchart of a process step from the flowchart of 5 ; and

7 a Flussschaudiagramm to illustrate a further embodiment of the method according to the invention.

The exemplary embodiment explained below is a preferred embodiment of the invention. In the exemplary embodiment, the described components of the embodiment each represent individual features of the invention that are to be considered independently of one another, which also each independently further develop the invention and thus also individually or in a different combination than the one shown as part of the invention. Furthermore, the described embodiment can also be supplemented by further features of the invention already described.

In the figures, functionally identical elements are each provided with the same reference numerals.

1 shows a motor vehicle 10 , which may be, for example, a passenger car or a truck. In the motor vehicle 10 can vehicle components 11 . 12 over a communication network 13 for exchanging data packets 17 be coupled with each other. The communication network 13 can be an ethernet network 14 and a bus network 15 include. There may also be multiple Ethernet networks and / or bus networks in the communication network 13 be provided. The Ethernet network 14 For example, it may be operated according to the standard Ethernet TSN. The bus network 15 For example, it may be based on the FlexRay standard.

In the vehicle components 11 . 12 For example, each may be a sensor unit or an actuator. For example, the vehicle components 11 each represent a sensor or a sensor unit, for. As a radar or a camera, and the vehicle components 12 one actuator each, z. B. a brake. In the vehicle components 11 . 12 For example, they can be elements of a driver assistance system.

The networks 14 . 15 can via a control device 16 coupled with each other over which data packets 17 between the networks 14 . 15 can be transmitted.

2 shows the control device 16 in isolation. The control device 16 can, for example, as a control unit of the motor vehicle 10 be designed. 2 illustrates a transmission of a data packet 17 from the bus network 15 into the ethernet network 14 , In a manner known per se, each of the networks 14 . 15 via a respective physical connection or interface 18 . 19 the control device 16 connected to this. A receiving device 20 can the data package 17 from the physical interface 19 receive. The data package 17 can for example be part of a bus message 21 which is in addition to the data packet 17 , So the actual payload, even more log data includes. A gateway unit GW may be the data packet 17 from the bus message 21 Extract in a known manner. Therefore, this will not be considered in more detail below.

The data package 17 can through the receiving device 20 in a data store 22 saved or buffered. From the data store 22 can the data package 17 through an output device 23 read out and via the physical interface 18 of the Ethernet network 14 be sent out in this. The receiving device 20 and the output device 23 For example, these may each be used as program modules of a program code for a processor device 24 the control device 16 be realized.

A timer unit TimeUnit can synchronize the system times in the different networks.

Based on 2 and 3 is explained below, as transmission times for sending the data packet 17 and other data packets 17 through the receiving device 20 and the output device 23 be determined.

The output device 23 can queues 25 for the separate or independent storage of data packets 17 exhibit. The queues 25 can have a respective blocking gate 26 with a transmitting unit 27 be coupled. The transmitting unit 27 may be a scheduler, for example. The queues 25 and the locking gates 26 can by a so-called Qbv-Shaper S according to the Standard IEEE 802.1Qbv be formed.

The barrier gates 26 are dependent on a checklist 28 switched, the several transmission steps 29 may include, for each of which a gate control command 30 (C-closed, blocked, closed; O-open, open) is provided. The checklist 28 is cycled, the total duration of the transmission steps 29 a cycle time 31 the checklist 28 can result. By switching the blocking gate 26 can each have a packet of data that is in a queue 25 is cached, whose blocking gate 26 is open, to the transmitting unit 27 arrive or be transferred and from this into the Ethernet network 14 to be sent out.

In the in 3 For example, assume that the data packet 17 stored in the third queue from the left. Thus, the data packet in the sending step 29 with the in 3 specified designation T002 forwarded (gate control command o).

For this the data package must 17 In addition, first in the correct queue (in the example in the third queue from the left) are stored. This is done by the receiving device 20 by means of a selection unit 32 set based on a distribution plan 33 every data packet 17 one of the queues 25 assigned.

The distribution plan 33 and the checklist 28 are coordinated with each other. The distribution plan 33 and the checklist 28 can be based on a fibex file 34 which is a broadcast schedule or schedule of the bus network 15 describes.

4 illustrates how to use data packets 17 of the bus network 15 through the Qbv Shaper S using the checklist 28 it can be ensured that data packets 17 that are over the bus network 15 at predetermined intervals 35 according to the transmission schedule also arrive on the ethernet network 14 with these intervals 35 be sent out, although more data packets 17 ' another network BE also over the Ethernet network 14 to be sent out. The other network BE is then treated according to the Best Effort principle.

4 shows, like two queues 25 can be used in 4 are referred to as Q1, Q2. The queue Q1 is used to buffer the data packets 17 used. The queue Q2 is then used for the data packets 17 ' used. By appropriate gate control commands 30 for opening and closing the blocking gate 26 in the individual transmission steps 29 this results in a transmission order of the data packets 17 . 17 ' through which the time intervals 35 be respected. In 4 are the transmission steps 29 by the name Cycle 2 distinguished up to n. To every transmission step 29 results in a send process 36 , which are distinguished here by the term Output Cycle 1 to n.

To the intervals 35 to adjust correctly, two aspects have to be considered. Firstly, it must be through the selection unit 32 to every data package 17 the correct or correct queue 25 , So for example, Q1, are set, in which then the data packet 17 is cached. On the other hand, at the right time of transmission, ie in the correct transmission step 29 , a gate tax command 30 for opening the blocking gate 26 for this queue 25 be provided. In other words, so must the distribution plan 33 and the checklist 28 on the schedule of the bus network 15 be coordinated.

5 illustrates a method by which the distribution plan 33 and the checklist 28 can be generated accordingly.

In a process step P1 can from the Fibex file 34 Bus Fibex parameters are read, for example, the number of bus network 15 provided channels and / or a cycle time. In particular, FlexRay parameters are read out.

In a process step P2, on the basis of these parameter values, a required bandwidth or data rate BW can be calculated by determining for each channel how large its cycle time is and how many base cycles are provided. Here, unoccupied basic cycles can be subtracted. It is then checked whether the data rate BW is less than or equal to the maximum data rate BWmax of the Ethernet network 14 is. If this is not the case (symbolized by -), then in a process step P3 an error signal 37 be generated. In other words, it signals that the time intervals 35 in the ethernet network 14 not guaranteed can be. If the required data rate BW is less than or equal to the maximum data rate BWmax (symbolized by +), then the process step P4 can be carried out, which in the following is based on 6 will be explained in more detail.

In 6 Here, a pseudocode notation (from ... to ... - For loop) is used. In a process step P41, for example, from the Fibex file 34 Description data of the bus network 15 which specifies how many slot-base-cycle base cycles and how many timeslots SlotId_max Pro base cycle slot-base-cycle are provided.

In a process step P42, all basic cycles are then iterated. In this case, in a process step P43, each time slot SlotId is iterated per basic cycle slot-base cycle. For each slot SlotId can in a process step P44 for the data packet to be sent therein 17 Check if there is a free queue Q in the queues 25 gives in which the data packet can be cached. In a process step P45, a suitable gate control time T for opening the associated blocking gate can then be added to the free queue 26 and thus for forwarding the data packet 17 be determined.

If no corresponding combination of a free queue Q and a gate control time T can be determined (in 6 symbolized by), this is detected in a process step P46 and in a process step P47 the error signal 37 (ERR) generated. This signals that the time intervals 35 in the ethernet network 14 can not be met. In a process step P48, the method can be aborted.

If a combination of free queue Q and matching gate control time T can be determined (in 6 symbolized by +), an entry can be made in a process step P49 38 with a gate control command 30 for opening the blocking gate 26 to the gate control time T in the checklist 28 get saved. In the distribution plan 33 can be an entry 39 for identifying the corresponding data packet 17 and identify the free queue Q to use.

The Ethernet network 14 can have at least one switch SW, via which network branches 14 ' . 14 '' of the Ethernet network 14 can be connected.

In 7 is illustrated as well as for each switch SW of the Ethernet network 14 a corresponding checklist 28 ' can be generated to even with a transmission of the data packets 17 within the Ethernet network 14 across a switch SW, the time intervals 35 maintain. Also 7 uses the pseudocode notation. In a process step P5, all switches SW, which are along a transmission path for the data packets, can successively be selected 17 lie, be selected. It is assumed that the number of switches is SWmax. For each switch, in a process step P6, a respective connection port or port, which is involved in the transmission, can be selected. In 7 It is assumed that a total of a number of Portmax is to be selected in a switch.

For each port, it can first be checked in a process step P7 whether its time fluctuation or ΔT is less than or equal to a maximum value T0. If this is not the case (symbolized by), then in a process step P8 the error signal 37 be generated to signal that the time intervals 35 can not be met. If, on the other hand, the jitter ΔT is less than or equal to T0 (symbolized by +), a checklist and optionally a distribution plan can be generated for the switch in a process step P9. This can be done for the switch analogous to the process step P4. This is then used instead of the bus network 15 the transmission behavior of the upstream control device 16 or the upstream switch.

By means of the control device 16 can thus a quality of service, ie in particular the maintenance of relative time intervals 35 or transmission times over a heterogeneous communication network 13 be ensured. This allows in particular an Ethernet network 14 according to the Standard IEEE 802.1Qbv with a bus network 15 , in particular a FlexRay network. The basis for this is the time-controlled communication of the bus network 15 on the Standard IEEE 802.1Qbv transferred by the queues 25 timed locked and opened.

This allows a FlexRay cycle between 128 microseconds and 128 milliseconds per base cycle with a total of 64 such basic cycles on an Ethernet network 14 transferred to.

The control device 16 can be designed as a control unit with an integrated Ethernet switch or as a control unit with an Ethernet interface. It can also be used as a controller for real-time critical data or as a gateway or as a control unit for vehicle dynamics. By means of the control unit 16 is a sensor function possible by providing sensor data in the desired order and at desired intervals 35 can be provided to drive actuators.

Overall, the example shows how the invention can provide a method for transmitting the quality of service from FlexRay to Ethernet TSN (Time Sensitive Networking).

LIST OF REFERENCE NUMBERS

10

motor vehicle

11

vehicle components

12

vehicle components

13

Communication network

14

Ethernet network

15

Bus network

16

control device

17

data packet

17 '

data packet

18

interface

19

connection

20

receiver

21

Bus message

22

data storage

23

output device

24

processor means

25

queue

26

gate switch

27

transmission unit

28

checklist

29

sending step

30

Gate control command

31

cycle time

32

selector

33

distribution plan

34

Fibex file

35

intervals

36

sending

37

error signal

38

entry

39

entry

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102012223308 A1 [0007]

Cited non-patent literature

• Standard IEEE 802.1Qbv [0001]
• Standard IEEE 802.1Qbv [0011]
• Standard IEEE 802.1Qbv [0042]
• Standard IEEE 802.1Qbv [0060]
• Standard IEEE 802.1Qbv [0060]

Claims (10)

Method for transmitting data packets ( 17 ) between an Ethernet network ( 14 ) and a timed bus network ( 15 ) by means of a control device ( 16 ), whereby the control device ( 16 ) for sending and / or receiving the data packets ( 17 ) over the Ethernet network ( 14 ) several queues ( 25 ) for temporarily storing the data packets ( 17 ) and the queues ( 25 ) via a respective controllable blocking gate ( 26 ) with the Ethernet network ( 14 ) and the blocking gates ( 26 ) for passing data packets ( 17 ) between the respective queue ( 25 ) on the one hand and the Ethernet network ( 14 ) on the other hand, according to a cyclically checked checklist ( 28 ), characterized in that the data packets ( 17 ) in the bus network ( 15 ) are transmitted according to a predetermined schedule, so that a respective relative time interval ( 35 ) between the data packets ( 17 ) and by a selection unit ( 32 ) of the control device ( 16 ) to each of the data packets ( 17 ) one of the queues ( 25 ) according to a distribution plan ( 33 ) and the data packet ( 17 ) for transmission between the Ethernet network ( 14 ) and the bus network ( 15 ) in the selected queue ( 25 ) and stored in the control device ( 16 ) the checklist ( 26 ) is set such that when transmitting the data packets the respective relative time interval ( 35 ) of the data packets ( 35 ) preserved. Method according to claim 1, wherein for determining the distribution plan ( 33 ) and the checklist ( 28 ) the transmission schedule of the bus network ( 15 ) and from the transmission schedule a respective transmission time of each of the data packets ( 17 ) and the cyclically checked checklist ( 28 ) for the blocking gates ( 26 ) to one cycle duration ( 31 ), which corresponds to a total duration of at least one cyclically repeated base cycle of the bus network ( 15 ), and for at least one time slot included in the at least one base cycle for transmitting one of the data packets ( 17 ), a corresponding combination of a free queue (Q) for buffering the data packet ( 17 ) and a gate control time (T) for the blocking gate ( 26 ) of the free queue (Q) is determined. Method according to claim 2, wherein for the determined free queue (Q) an entry ( 39 ) in the distribution plan ( 33 ) and for the gate control point (T) an entry ( 38 ) in the checklist ( 28 ) is produced. The method of claim 2 or 3, wherein the broadcast schedule is from a Fibex record ( 34 ) is read out. Method according to one of the preceding claims, wherein within the Ethernet network ( 14 ) at least one switch unit (SW) for forwarding the data packets ( 17 ) between at least two network branches ( 14 ' . 14 '' ) and in each switch unit (SW) also respective queues and a respective checklist ( 28 ' ) and the checklist ( 28 ' ) each switch unit (SW) depending on the checklist ( 28 ) of the control device ( 16 ) is set such that the relative time interval ( 35 ) of the data packets ( 17 ) within the Ethernet network ( 14 ) preserved. Method according to one of the preceding claims, wherein the Ethernet network ( 14 ) according to a TSN standard, in particular the IEEE 802.1Qbv standard. Method according to one of the preceding claims, wherein as the time-controlled bus network ( 15 ) a FlexRay network is used. Method according to one of the preceding claims, wherein it is verified whether the data packets sent according to the transmission schedule ( 15 ) in combination with a respective data volume of the data packets ( 15 ) yields a data rate that is less than or equal to a maximum data rate of the Ethernet network ( 14 ), and otherwise an error signal ( 37 ) is produced. Control device ( 16 ) for coupling at least one Ethernet network ( 14 ) with at least one bus network ( 15 ), characterized in that the control device ( 16 ) a processor device ( 24 ) having a program code which is set up, when executed by the processor device ( 24 ) to carry out a method according to any one of the preceding claims. Motor vehicle ( 10 ) with at least one Ethernet network ( 14 ) and at least one bus network ( 15 ), characterized in that the at least one Ethernet network ( 14 ) and the at least one bus network ( 15 ) via a control device ( 16 ) are coupled according to claim 9.

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