JP4786330B2 - In-vehicle LAN system, electronic control unit and relay connection unit - Google Patents

Description

  The present invention relates to an in-vehicle LAN system, an electronic control unit, and a relay connection unit. More specifically, in an in-vehicle LAN system including a plurality of segments, the connection state of each electronic control unit connected to the in-vehicle LAN network is automatically determined. In particular, the present invention relates to a relay connection unit capable of appropriately managing and appropriately relaying a portion connecting an electronic control unit to an in-vehicle LAN network.

  In recent years, with the increase in functions of automobiles, the number of electronic control units (ECUs) installed in automobiles also tends to increase. Further, an in-vehicle LAN system that connects each ECU via a vehicle control network (hereinafter simply referred to as an in-vehicle LAN network) is used.

  On the other hand, each ECU connected to the in-vehicle LAN network periodically transmits a message with identification information added to data such as measurement values, and each ECU connected to another in-vehicle LAN network connected to the in-vehicle LAN network A message including necessary data is received from a vast number of messages distributed via the in-vehicle LAN network, and the control target is controlled.

  However, when the communication load factor of the in-vehicle LAN network increases, the probability that a message including data to be periodically transmitted from the ECU collides with other messages communicated on the in-vehicle LAN network increases. The generated message needs to be transmitted after waiting for a free space in the in-vehicle LAN network, for example, by accumulating in a buffer. For this reason, a transmission interval of a message including data to be periodically output to another ECU or the like may be disturbed or a delay time may be increased.

  Therefore, it is considered to divide the in-vehicle LAN network into a plurality of segments, reduce the data traffic communicated by the communication lines constituting one segment, and connect the segments by a relay connection unit such as a gateway or a hub. In this case, the relay connection unit selects a message to be relayed to each communication line. However, in the case of an in-vehicle LAN, information indicating the message destination is usually not included. Therefore, a special device for relaying a necessary message reliably and preventing an unnecessary message from being relayed by the relay connection unit. In need of.

  A gateway according to Japanese Patent Laid-Open No. 2003-264571 (Patent Document 1) has a fixed list of identification information of messages to be relayed in a ROM. In other words, in the case of Patent Document 1, only a necessary message can be relayed by defining a list of the identification information using a bit assignment table or the like at the design stage of the in-vehicle LAN system.

JP 2003-264571 A

  However, in order for the relay connection unit to have the identification information of the message to be relayed, it is necessary to write the information of each ECU attached to the relay connection unit at the time of manufacture of the relay connection unit. Since the relay connection unit cannot be attached to another part, there is a problem that the versatility becomes poor.

  In addition, in the case of an in-vehicle LAN having a multicast configuration in which the transmission destination is not determined, there is no means for determining whether a relay connection unit that requires a message is necessary even if the message is received. If the connection unit does not have the identification information of the message to be relayed, it must be relayed to all the communication lines, and there is a problem that the traffic in each segment cannot be reduced.

  The present invention has been made in consideration of the above-mentioned problems, and the object of the present invention is to relay a message by a relay connection unit according to the environment in which the relay connection unit is installed, even if the message is multicast on the in-vehicle LAN network. It is to provide an in-vehicle LAN system, an electronic control unit, and a relay connection unit that can automatically set identification information of a target message.

In order to solve the above problems, the present invention provides:
A plurality of in-vehicle LAN segments for transmitting / receiving messages by connecting at least one electronic control unit to the communication line, and a relay connection unit for relaying messages between the segments connected to the communication lines of these segments An in-vehicle LAN system comprising:
Each electronic control unit has a reception request transmission means for transmitting a reception request list formed by listing identification information of messages to be received at the time of activation,
The relay connection unit is
Multiple ports connected to each communication line to send and receive messages,
Relay processing means for relaying messages sent and received via the port;
A means for recording relay target identification information for recording the identification information of the message relayed by the relay processing means and the relay destination port;
The relay destination port to which the message of each identification information is to be relayed is determined from the information of the reception port of the reception request list from each electronic control unit received through each port and the identification information included in the reception request list. And a relay management means for updating the relay target identification information.

  According to the above configuration, since the reception request transmission means provided in the electronic control unit transmits the reception request list in which the identification information of the messages to be received is enumerated at the time of activation, the relay connection unit is connected to each electronic control unit. The reception request list can be received via the connected port.

  The relay management means forms a list of identification information of messages to be transmitted through each port by using the identification information included in the received reception request list and the information of the reception port of the reception request list. Thus, the relay target identification information can be updated sequentially. In other words, in the relay connection unit, the relay management means creates relay target identification information using the reception request list received from each electronic control unit. Therefore, only the necessary ports according to the environment in which this relay connection unit is installed. The relay target identification information can be adjusted so that necessary messages can be relayed, and optimal relay can be performed without waste.

  The relay target identification information may be adjusted according to the connection environment of the relay connection unit by being formed by being sequentially updated using each reception request list that is deleted at the time of activation and can be received after the activation. Conceivable. However, it may be adjusted according to the connection environment of the relay connection unit by deleting the identification information of the relay target that is no longer updated due to reception of the reception request list even after being activated a predetermined number of times. It is also possible to switch the relay target identification information in accordance with the position of the ignition key (ON, ACC, OFF). In other words, the time of starting is considered when the electronic control unit is connected to the in-vehicle LAN network to start the function as the in-vehicle LAN, or when the ignition key is operated to change from the off state to the accessory state or the on state. It is done.

  Each of the ports is an arbitrary standard such as one that conforms to LIN (Local Interconnect Network), CAN (Controller Area Network), FlexRay (registered trademark), MOST (Media Oriented Systems Transport), D2B (Domestic Digital Bus), IDB 1394, etc. In-vehicle LAN communication means conforming to the above, and in-vehicle LAN communication means conforming to different standards may be formed at each port. Moreover, it is preferable to form a single segment bus of an in-vehicle LAN complying with an arbitrary standard between each electronic control unit and the relay connection unit. Alternatively, the electronic control unit and the relay connection unit may be directly star-connected in a one-to-one relationship by an in-vehicle LAN communication line.

  Since the number of ports provided in the relay connection unit is two or more, the relay connection unit functions as a gateway that can connect two or more in-vehicle LAN segments.

The relay connection unit has nonvolatile recording means for basic relay target identification information for recording identification information of a message that basically needs to be relayed and a relay destination port,
It is preferable that the relay management unit reads the basic relay target identification information from the non-volatile recording unit at the time of activation and records the basic relay target identification information on the recording unit as the relay target identification information.

  According to the above configuration, the minimum recording information to be relayed is recorded in the non-volatile recording means, and the message having at least the minimum necessary information to be relayed is relayed. A highly in-vehicle LAN system can be obtained. The non-volatile recording means is preferably a rewritable ROM such as a flash memory, but a non-volatile RAM or the like may be used by a backup power source.

At least one of the ports is a main line connection port connected to an adjacent relay connection unit, and
It is preferable to have a relay reception request transmitting means for transmitting a reception request list formed by listing identification information in the relay target identification information to an adjacent relay connection unit connected through the trunk connection port.

  According to the said structure, the identification information of the message which should be relayed across the vehicle-mounted LAN divided | segmented into the several segment can be exchanged mutually by connecting a relay connection unit via a trunk line connection port. The main line connection port is preferably an in-vehicle LAN communication means capable of communicating at a higher speed than other ports. The relay reception request transmission means preferably transmits a reception request list based on the changed identification information when the identification information recorded in the recording means in the relay connection unit is changed.

The present invention also provides:
An electronic control unit that is connected to a vehicle-mounted LAN communication line and transmits and receives messages, and has a reception request transmission means for transmitting a reception request list that enumerates identification information of messages to be received at startup. A featured electronic control unit is provided.

  According to the above configuration, since the reception request transmission means provided in the electronic control unit transmits a reception request list that enumerates identification information of messages to be received at the time of activation, the electronic control unit is connected. An electronic control device such as a relay connection unit connected to the communication line can receive the reception request list. That is, when an electronic control device such as a relay connection unit connected to the communication line receives a message of identification information included in the reception request list from other than the communication line, it can transmit the message to the communication line. it can.

The present invention also provides:
A relay connection unit that connects a plurality of segments of an in-vehicle LAN that transmits and receives messages by connecting at least one electronic control unit to a communication line, and relays messages between segments,
Multiple ports connected to each communication line to send and receive messages,
Relay processing means for relaying messages sent and received via the port;
A means for recording relay target identification information for recording the identification information of the message relayed by the relay processing means and the relay destination port;
From the reception port information of the reception request list that lists the identification information of the messages to be received that are received from each electronic control unit via the respective ports and the identification information included in the reception request list, There is provided a relay connection unit characterized by having relay management means for obtaining each relay destination port to relay a message and updating the relay target identification information.

  According to the above configuration, the relay management unit uses the identification information included in the received reception request list and the information of the reception port that has received the reception request list, so that the message to be transmitted through each port is transmitted. A list of identification information can be formed, whereby the relay target identification information can be updated sequentially. In other words, in the relay connection unit, the relay management means creates relay target identification information using the reception request list received from each electronic control unit. Therefore, only the necessary ports according to the environment in which this relay connection unit is installed. The relay target identification information can be adjusted so that necessary messages can be relayed, and optimal relay can be performed without waste.

  When an electronic control unit is added to the in-vehicle LAN network, the reception request list only needs to be transmitted to the communication line by listing a reception request list that enumerates message identification information required by the newly added electronic control unit. A message of identification information included in the list can be transmitted to the communication line. That is, an electronic control unit can be easily added to the in-vehicle LAN network.

  The relay target identification information may be adjusted according to the connection environment of the relay connection unit by being formed by being sequentially updated using each reception request list that is deleted at the time of activation and can be received after the activation. Conceivable. However, in the case of an in-vehicle LAN, the environment does not change frequently, so by deleting the relay target identification information that is no longer updated by receiving the reception request list even if it is activated a predetermined number of times, It may be adjusted according to the connection environment. It is also possible to switch the relay target identification information in accordance with the position of the ignition key (ON, ACC, OFF). In other words, the start time may be the time when each electronic control unit is connected to the in-vehicle LAN network and the function as the LAN is started, or when the ignition key is operated to change from the off state to the accessory state or the on state. .

  The port conforms to any standard such as LIN (Local Interconnect Network), CAN (Controller Area Network), FlexRay (registered trademark), MOST (Media Oriented Systems Transport), D2B (Domestic Digital Bus), IDB 1394, etc. It may be a vehicle-mounted LAN communication unit that complies with the vehicle-mounted LAN communication unit that conforms to different standards at each port. Moreover, it is preferable to form a single segment bus of an in-vehicle LAN complying with an arbitrary standard between each electronic control unit and the relay connection unit. Alternatively, the electronic control unit and the relay connection unit may be directly star-connected in a one-to-one relationship by an in-vehicle LAN communication line.

  When the in-vehicle LAN communication means provided in the relay connection unit includes two or more ports, the relay connection unit functions as a gateway capable of relay-connecting two in-vehicle LAN segments.

Non-volatile recording means of basic relay target identification information for recording the identification information of the message that basically needs to be relayed and the relay destination port,
It is preferable that the relay management unit reads the basic relay target identification information from the non-volatile recording unit at the time of activation and records the basic relay target identification information on the recording unit as the relay target identification information.

  According to the above configuration, the minimum recording information to be relayed is recorded in the non-volatile recording means, and the message having at least the minimum necessary information to be relayed is relayed. A highly in-vehicle LAN system can be obtained. The non-volatile recording means is preferably a rewritable ROM such as a flash memory, but may be a RAM that is made non-volatile by a backup power source.

At least one of the ports is a main line connection port connected to an adjacent relay connection unit, and
There may be provided a relay reception request transmission means for transmitting a reception request list formed by listing identification information in the relay target identification information to an adjacent relay connection unit connected through the trunk connection port.

  According to the said structure, the identification information of the message which should be relayed across the vehicle-mounted LAN divided | segmented into the several segment can be exchanged mutually by connecting a relay connection unit via a trunk line connection port. The main line connection port is preferably an in-vehicle LAN communication means capable of communicating at a higher speed than other ports. The relay reception request transmission means preferably transmits a reception request list based on the changed identification information when the identification information recorded in the recording means in the relay connection unit is changed.

  As described above, according to the present invention, the message identification information required by the electronic control unit connected to the relay connection unit via each communication line can be obtained from the reception request list. Even in an in-vehicle LAN that does not have destination information, the relay connection unit can relay to a communication line that requires only a required message. In other words, it is possible to dynamically cope with the environment of the communication line to which the relay connection unit is connected, perform relay without waste between segments, and suppress the communication load factor in each segment of each in-vehicle LAN. Therefore, it is possible to perform stable communication while suppressing the occurrence of collision accompanying an increase in the communication load factor.

  The electronic control unit connected to the in-vehicle LAN network transmits a reception request list that enumerates identification information of messages required by the in-vehicle LAN network to the communication line. A message of specified identification information can be received from an electronic control unit connected to the. In other words, it is not necessary to grasp and set the connection status of all electronic control units at the time of design, and it is possible to flexibly cope with the increase in the number of electronic control units connected to the relay connection unit. it can.

  Since the identification information of the message to be relayed can be dynamically changed according to the state of the electronic control unit connected to the in-vehicle LAN network, for example, the electronic control that enters the standby state according to the state of the ignition key It is possible to dynamically change the information of the relay target identification information according to the state of the unit so as to perform the most efficient relay in each state.

  If the relay connection unit has a non-volatile recording means for recording basic relay target identification information in which the identification information of a message that basically needs to be relayed and the relay destination port are recorded, at least the minimum necessary Since the message having the identification information to be relayed is relayed, a more reliable in-vehicle LAN system can be obtained.

  FIG. 1 is a diagram showing a configuration of an in-vehicle LAN system A formed by using a relay connection unit 1 according to the first embodiment of the present invention. 2 is an electronic control unit (hereinafter referred to as an ECU: Electronic Control Unit) connected to the relay connection unit 1, and 3 is a communication line for connecting each ECU 2 to the relay connection unit 1 (in this embodiment, three communication lines 3a to 3a). 4 is an in-vehicle LAN network formed by connecting the communication lines 3 a to 3 c by the relay connection unit 1.

  The relay connection unit 1 relays messages between the communication lines 3a, 3b..., And the in-vehicle LAN communication means 10 connected to the communication lines 3a, 3b. The relay processing means 11 to be connected, the relay target identification information recording means 12 by the relay processing means 11, the relay management means 13 for updating the relay target identification information, and the nonvolatile recording means 14 are provided.

  The ECU 2... Has an in-vehicle LAN communication means 20, an interface 21 connected to the control object of the load L and sensor S, a control means 22 for controlling and managing each load L and sensor S via the interface 21, A reception request transmission unit 23 connected to the in-vehicle LAN communication unit 20 and transmitting the reception request list R of the own station to the communication line. The in-vehicle LAN communication means 20 transmits and receives messages conforming to the CAN standard, for example. In addition, when it is necessary to distinguish each ECU2 in the following description, it demonstrates using code | symbol 2aa, 2ab, 2ba, 2bb, 2ca, 2cb ....

  The communication line 3 is a CAN bus made of a twisted pair cable conforming to the CAN standard, and the communication lines 3a, 3b, 3c are connected to the ECUs 2aa, 2ab,. The lines 3a, 3b, 3c and the ECUs 2aa, 2ab ..., 2ba, 2bb ..., 2ca, 2cb ... constitute the segments Sa, Sb, Sb of the in-vehicle LAN, respectively.

  In this embodiment, the communication lines 3a, 3b, 3c connect a plurality of ECUs 2aa, 2ab ..., 2ba, 2bb ..., 2ca, 2cb ..., respectively. ..., 2ba, 2bb ..., 2ca, 2cb ... constitute segments Sa, Sb, Sc, respectively. However, the communication lines 3a, 3b,... May each directly connect one ECU 2 to the relay connection unit 1. That is, the communication lines 3a, 3b,... May constitute a vehicle-mounted LAN bus, a star-type vehicle-mounted LAN network centering on the relay connection unit, or a mixture thereof. .

  As shown in detail in FIG. 2, the in-vehicle LAN communication means 10 of the relay connection unit 1 has a plurality of ports 10a, 10b... Connected to the communication lines 3a, 3b. In this embodiment, each port 10a, 10b... Transmits and receives messages according to a communication protocol compliant with CAN. However, the communication lines 3a, 3b... Are different types according to LIN, CAN, FlexRay, etc. In this case, the ports 10a, 10b,... Transmit and receive in accordance with a communication protocol corresponding to the communication lines 3a, 3b,.

  1 and 2 show an example in which the in-vehicle LAN communication means 10 has three ports 10a to 10c for the sake of simplicity. However, the present invention limits the number of ports of the in-vehicle LAN communication means 10. It goes without saying that it is not something you do. Further, a different in-vehicle LAN communication means 10 can be formed for each port 10a, 10b.

  The relay processing means 11 transmits a message received from each of the ports 10a, 10b... Based on the relay target identification information B recorded in the recording means 12 via appropriate ports 10a, 10b. Further, the recording means 12 for the relay target identification information B is preferably a memory made of a recording medium that can be read at high speed such as a static memory.

  The relay management means 13 receives the reception request list R from the ECUs 2 connected via the ports 10a, 10b,..., Information on the reception ports 10a, 10b. The relay target identification information B is updated by obtaining the relay destination ports 10a, 10b,... To which the message of each identification information ID should be relayed from the identification information ID included in the reception request list R.

  Further, the nonvolatile memory 14 basically records basic relay target identification information Ba in which the identification information ID of a message that needs to be relayed and the relay destination ports 10a, 10b,. This basic relay target identification information Ba is influenced by, for example, information necessary for the operation immediately after the vehicle is started, message identification information including important information essential for the operation of the vehicle, and the vehicle type and grade. It includes identification information of a message transmitted from the ECU 2 that is reliably provided without any problems.

  As shown in detail in FIG. 3, each ECU 2 communicates with other ECUs 2... Via the communication line 3 to transmit data indicating measured values and states by the sensors S as messages to the other ECUs 2. The load L is controlled by using data indicating measured values and states included in messages received from other ECUs 2... And the in-vehicle LAN communication means 20 transmits and receives messages using a communication protocol compliant with CAN. Is to do. In other words, the manufacturing cost can be reduced because it conforms to the CAN standard widely used at present. The in-vehicle LAN communication means 20 may be compliant with an in-vehicle LAN other than CAN, such as LIN, CAN, FlexRay, etc., in accordance with the communication protocol of other ECUs 2... Communicating using the same communication line 3. Needless to say.

  The interface 21 has various input means such as an output means including a drive circuit for supplying power for driving the load L, and an AD converter for converting a signal from the sensor S into a digital signal.

  In the example shown in FIG. 3, the control means 22 and the reception request transmission means 23 include a control program Pa and a reception request transmission program Pb that can be executed by the CPU 2c constituting the ECU 2, and a reception request list R is recorded in the CPU 2c. A recording unit 24 is formed. In other words, the configuration of the ECU 2 can be simplified as much as possible by forming the units 22 to 24 by software. Needless to say, these units 22 to 24 can be configured by different hardware.

  The control program Pa selects a message to be received using message identification information received via the in-vehicle LAN communication means 20, and inputs a measurement value from the sensor S via the interface 21. The load L is controlled by outputting a control signal to the load L via the. Moreover, the measured value by the sensor S is transmitted to other ECUs 2.

  The reception request transmission program Pb is transmitted as a message using the reception request list R in the recording unit 24 via the in-vehicle LAN communication means 20 at the time of activation. Here, the time of starting means the time when energization of the ECU 2 has started. For example, when the in-vehicle LAN system A is connected to a power source (battery), or when the ignition key of the vehicle is off, It is possible to consider a point in time when the state is turned on or a point in time when the accessory is turned on. Further, when a new ECU is connected to the vehicle LAN network 4 that is already activated, the newly connected ECU is activated, so the reception request transmission means 23 transmits the reception request list R. .

  That is, when the in-vehicle LAN system A is connected to the power source, the number of ECUs 2 connected to the in-vehicle LAN network 4 is determined, and the identification information of the message to be transmitted / received via each communication line 3 is determined. Also, there are ECUs 2 that are in a standby state when the ignition key is off or in the accessory state, and therefore it is preferable that the ignition key is switched at the time of activation. The relay target identification information B is preferably set in accordance with the state of the ignition key (ON, OFF, ACC, etc.).

  As shown in FIG. 4, the reception request list R transmitted from each ECU 2aa (hereinafter, when the reception request list R transmitted from each ECU 2aa, 2ab... Is distinguished, the symbols Raa and Rab are used). It includes identification information IDs m2 and m3, and indicates that the ECU 2aa needs three messages m1, m2 and m3. Similarly, it can be seen from the reception request list Rab that the ECU 2ab needs two messages m1 and m4. Further, these ECUs 2aa and 2ab are both connected to the communication line 3a.

  When the ECUs 2 ... output the reception request list R ..., the relay connection unit 1 inputs the reception request lists Raa, Rab ... from the ports 10a, 10b ... of the in-vehicle LAN communication means 10. The relay management means 13 reads the basic relay target identification information Ba from the non-volatile memory and records it in the recording means 12 when the relay connection unit 1 is started up, so that the identification information ID of the message that basically needs to be relayed Is written in the recording means 12 as relay target identification information B. Further, when receiving the message of the reception request list Raa, Rab... Via each port 10a, 10b..., The relay target identification information B recorded in the recording means 12 is updated.

  In the present invention, on the assumption that basic relay target identification information B is recorded in the recording means 12 in advance, the relay target identification information B is updated in response to reception of the reception request list R. However, when nothing is recorded as the relay target identification information B in the recording unit 12, the relay management unit 13 newly generates the relay target identification information B. Nor. The relay target identification information B may be generated and updated based on the newly received reception request list R which is cleared every time it is activated. It may be updated by deleting what is not updated by the list R. Furthermore, it goes without saying that a plurality of relay target identification information B may be recorded in accordance with the state of the ignition key (off, accessory, on).

When the reception request list R as shown in FIG. 4 is received, the relay target identification information B generated by the relay management means 13 is as shown in FIG.
As shown in FIG. 5, the relay target identification information B shows a list of communication lines 3 to which the identification information ID of each message m1, m2,... And the relay destination port to be relayed are connected. Can transmit the identification information of the messages m1, m2,... Received from the respective relay destination ports 10a, 10b,.

  In the in-vehicle LAN system A configured as described above, the relay connection unit can be adapted to the environment of the connected in-vehicle LAN only by connecting the communication lines 3 to the relay connection unit 1 without performing special settings. The relay target identification information B in 1 is automatically updated (generated), and a message that needs to be relayed can be relayed only to the necessary communication lines 3a and 3b. Accordingly, only necessary messages are transmitted / received to / from each communication line 3..., And traffic of communication data in each communication line 3. That is, the occurrence of collision can be suppressed as much as possible by reducing the communication load factor.

  FIG. 6 is a diagram showing a configuration of an in-vehicle LAN system A 'using a plurality of relay connection units 1A and 1B according to the second embodiment of the present invention. In FIG. 6, the portions denoted by the same reference numerals as those in FIGS. 1 to 5 are the same or equivalent portions, and thus detailed description thereof is omitted.

  In the case of the example shown in FIG. 6, the two relay connection units 1 </ b> A and 1 </ b> B are connected by connecting the communication line 3 z constituting the main line to the main line connection port 10 z provided in the in-vehicle LAN communication means 10. In addition, the main line connection port 10z is preferably configured to perform communication conforming to FlexRay (registered trademark), MOST (Media Oriented Systems Transport), D2B (Domestic Digital Bus), IDB1394, and the like capable of high-speed communication. , It may be compliant with CAN.

  Further, 15 lists the identification information IDs of messages having the ports 10a to 10d, 10e to 10h other than the trunk line connection port 10z in the relay target identification information B recorded in the recording means 12 as relay destination ports. Communication connected via the main line connection port 10z to the reception request list Rz (hereinafter, the reception request list Rz transmitted from the relay connection units 1A and 1B is represented by the symbols Rza and Rzb, respectively). It is a relay reception request transmission means for transmitting to the line 10z.

  In the in-vehicle LAN system A ′ of this example, the relay management unit 13 receives the reception request list Rza (or Rzb) from the adjacent relay connection unit 1A (or 1B), and receives the reception request list Rza (Rzb). ) And the identification information ID included in the reception request list Rza (Rzb), the relay destination ports to which the messages of the identification information IDs should be relayed are respectively determined and relayed. The target identification information B is updated.

  Therefore, by configuring as in the present embodiment, even when a plurality of relay connection units 1A and 1B are connected by the communication line 3z serving as a trunk line, each relay connection unit 1A and 1B does not perform any special setting. The relay target identification information B can be automatically updated (generated) so as to relay the message to be relayed only to the necessary communication lines 3... According to the environment of the connected in-vehicle LAN. That is, since the minimum necessary message can be transmitted to each communication line 3..., The communication load factor in each communication line 3.

1 is a diagram showing an entire in-vehicle LAN system according to a first embodiment of the present invention. It is a figure which shows the structure of the relay connection unit in the said vehicle-mounted LAN system. It is a figure which shows the structure of the electronic control unit in the said vehicle-mounted LAN system. It is a figure which shows the example of the reception request list | wrist transmitted from each electronic control unit. It is a figure which shows the example of the relay object identification information formed in the said relay connection unit. It is a figure which shows the whole vehicle-mounted LAN system which concerns on 2nd Example of this invention.

Explanation of symbols

1, 1A, 1B Relay connection unit 2 Electronic control unit 3 Communication line 4 In-vehicle LAN network 10 In-vehicle LAN communication means 11 Relay processing means 12 Recording means 13 Relay management means 20 In-vehicle LAN communication means 23 Reception request transmission means B Relay target identification information Ba basic relay target identification information R reception request list Rz relay reception request list m1, m2 ... message

Claims (7)

A plurality of in-vehicle LAN segments for transmitting / receiving messages by connecting at least one electronic control unit to the communication line, and a relay connection unit for relaying messages between the segments connected to the communication lines of these segments An in-vehicle LAN system comprising:
Each electronic control unit has a reception request transmission means for transmitting a reception request list formed by listing identification information of messages to be received at the time of activation,
The relay connection unit is
Multiple ports connected to each communication line to send and receive messages,
Relay processing means for relaying messages sent and received via the port;
A means for recording relay target identification information for recording the identification information of the message relayed by the relay processing means and the relay destination port;
The relay destination port to which the message of each identification information is to be relayed is determined from the information of the reception port of the reception request list from each electronic control unit received through each port and the identification information included in the reception request list. And a relay management means for updating the relay target identification information. The relay connection unit has nonvolatile recording means for basic relay target identification information for recording identification information of a message that basically needs to be relayed and a relay destination port,
2. The in-vehicle LAN system according to claim 1, wherein the relay management unit reads the basic relay target identification information from the non-volatile recording unit at startup and causes the recording unit to record the basic relay target identification information as the relay target identification information. At least one of the ports is a main line connection port connected to an adjacent relay connection unit, and
3. A relay reception request transmitting means for transmitting a reception request list formed by listing identification information in the relay target identification information to an adjacent relay connection unit connected via the trunk connection port. The in-vehicle LAN system described in 1.   An electronic control unit that is connected to a vehicle-mounted LAN communication line and transmits and receives messages, and has a reception request transmission means for transmitting a reception request list that enumerates identification information of messages to be received at startup. A featured electronic control unit. A relay connection unit that connects a plurality of segments of an in-vehicle LAN that transmits and receives messages by connecting at least one electronic control unit to a communication line, and relays messages between segments,
Multiple ports connected to each communication line to send and receive messages,
Relay processing means for relaying messages sent and received via the port;
A means for recording relay target identification information for recording the identification information of the message relayed by the relay processing means and the relay destination port;
From the reception port information of the reception request list that lists the identification information of the messages to be received that are received from each electronic control unit via the respective ports and the identification information included in the reception request list, A relay connection unit comprising: a relay management unit that obtains each relay destination port for relaying a message and updates the relay target identification information. Non-volatile recording means of basic relay target identification information for recording the identification information of the message that basically needs to be relayed and the relay destination port,
6. The relay connection unit according to claim 5, wherein the relay management unit reads the basic relay target identification information from the non-volatile recording unit at startup and records the basic relay target identification information on the recording unit as the relay target identification information. At least one of the ports is a main line connection port connected to an adjacent relay connection unit, and
7. The relay reception request transmitting means for transmitting a reception request list formed by listing identification information in the relay target identification information to an adjacent relay connection unit connected via the trunk connection port. Relay connection unit described in 1.

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