JP2008219354A - On-board network system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on board network system having a plurality of networks where a plurality of on board devices are connected. <P>SOLUTION: Respective ECUs 1, 2, 3, and 4 are so configured that if trouble occurs to an add processing unit of an add-drop unit of any of the ECUs, a signal to be add-processed by the add processing unit is add-processed by an add processing unit connected to a LAN 105 for backup, and transmitted to following-stage ECUs among the ECUs 1, 2, 3, and 4 through the LAN 105 for backup. Further, if trouble occurs to a drop processing unit of an add-drop part of any of precedent-stages among the ECUs 1, 2, 3, and 4 or to a drop processing unit of an add-drop unit of any of the ECUs 1, 2, 3, and 4 itself, a signal to be transmitted through a LAN 101 (or 102, 103, or 104) where the transmission of the signal is interrupted owing to the occurring trouble is acquired by a drop processing unit connected to the LAN 105 for backup through the LAN 105 for backup. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an in-vehicle network system having a plurality of networks to which a plurality of in-vehicle devices are connected.

There are an increasing number of vehicles that have built in-vehicle network systems by networking multiple devices mounted on vehicles for each highly related device. In such systems, communication between devices in each network is increasing. Processing efficiency can be improved.
In recent years, electronic equipment for vehicles has been remarkably digitized, and the number of electronic devices mounted on vehicles has been increasing. The complexity of each network consisting of multiple electronic devices has led to the development of wire harnesses for connecting electronic devices. Enlargement is a problem.

Thus, in order to simplify the wire harness, an attempt has been made to employ a multiplex communication system that multiplexes and transmits signals transmitted and received via each network. A technique related to a multiplex communication system is disclosed in Patent Document 1 below.
In Patent Document 1, when an abnormality occurs in any of a plurality of trunk LANs or branch LANs, data transmission is prevented by using another trunk LAN or branch LAN, thereby preventing interruption of data transmission. it can.
JP-A-6-276208

  In the system of Patent Document 1 described above, for example, when an abnormality occurs in any of the four trunk LANs, data transmission is performed using one of the three trunk LANs in which no abnormality has occurred. In the trunk LAN used for this data transmission, the amount of data to be transmitted increases and the load in data transmission increases. In addition, a trunk LAN in which no abnormality has occurred is used during normal operation, and may be affected by transmission of data that was scheduled to be transmitted by the trunk LAN in which an abnormality has occurred. Furthermore, when an abnormality occurs in the trunk LAN, there is a possibility that there is no usable trunk LAN, and in this case, data transmission is interrupted.

  The present invention has been made in view of the above circumstances, and its purpose is to use a spare network when any failure occurs in any of a plurality of networks used during normal operation. Accordingly, it is an object of the present invention to provide an in-vehicle network system that can reliably transmit a signal to be transmitted without interrupting transmission of a signal that is scheduled to be transmitted through a network in which a failure has occurred.

  Another object of the present invention is to reliably transmit a signal to be transmitted even when any of a plurality of networks used in normal operation cannot be used, and to be less affected by the entire system. It is to provide an in-vehicle network system.

  Another object of the present invention is to configure each in-vehicle device by configuring a plurality of networks used during normal operation by in-vehicle devices classified into multimedia system, body system, chassis system, and power train system, respectively. Therefore, it is possible to provide an in-vehicle network system capable of reducing the burden in the design processing of each in-vehicle device.

  Another object of the present invention is to provide an in-vehicle network system capable of transmitting a plurality of signals transmitted by each of a plurality of networks composed of a plurality of in-vehicle devices at a high speed using one optical fiber. is there.

  The in-vehicle network system according to the present invention is an in-vehicle network system having a plurality of networks to which a plurality of in-vehicle devices are connected, wherein each of the in-vehicle devices is one or a plurality of signals transmitted through each network. One or a plurality of add / drop means for performing add / drop processing on each of the signals is provided, and at least one spare network capable of performing the add / drop processing of signals by all in-vehicle devices is provided.

  According to the present invention, each of a plurality of in-vehicle devices transmits signals to all in-vehicle devices to an in-vehicle network system that performs add-drop processing on one or more signals among signals transmitted through the plurality of networks. At least one spare network capable of the add / drop process is provided. Therefore, when any failure occurs in any of the plurality of networks, signal transmission is not interrupted by using the spare network.

  In the vehicle-mounted network system according to the present invention, each of the plurality of networks is configured to transmit signals in a preset order to a plurality of connected vehicle-mounted devices. A network in which an add-drop unit performs an add-drop process on a signal of an in-vehicle device having a failure detection unit that detects a failure that occurs in any of the add-drop units included in the vehicle and an add-drop unit that the failure detection unit detects a failure Means for notifying the preceding on-board device and / or the following on-vehicle device, and when the on-vehicle device on the connected network has a failure, the on-vehicle device transmits the failure via the network. Means for transmitting a signal to be transmitted to the subsequent in-vehicle device via the spare network, and a front stage on the connected network If a failure vehicle apparatus, characterized by having a means for obtaining the signals to be acquired via the network through the spare network.

  According to the present invention, each network to which a plurality of in-vehicle devices are connected transmits signals in a preset order to each in-vehicle device, and any one of the add-drop means included in any of the in-vehicle devices. When a failure occurring in the vehicle is detected, the vehicle-mounted device having the add-drop unit in which the failure is detected notifies the preceding and / or subsequent vehicle-mounted device on the network where the add-drop unit performs signal drop processing. To do. When a failure occurs in a subsequent in-vehicle device on the connected network, each in-vehicle device transmits a signal scheduled to be transmitted through the network to the subsequent in-vehicle device through the spare network. In addition, each vehicle-mounted device acquires a signal scheduled to be acquired via the network when a failure occurs in a preceding vehicle-mounted device on the connected network via the backup network. Therefore, even when some trouble occurs in the add / drop means of any of the in-vehicle devices, it is possible to avoid the place where the trouble occurs and to reliably transmit the signal to be transmitted through the spare network.

  In the in-vehicle network system according to the present invention, the in-vehicle device detects that the signal cannot be subjected to the add process and / or the drop process by its own add / drop means, and the means that the means cannot perform the add process and / or the drop process. And a means for notifying the failure detection means of the fact when it is detected.

  According to the present invention, when the in-vehicle device detects that the signal cannot be added and / or dropped by its own add / drop unit, the in-vehicle device notifies the failure detection unit to that effect. Therefore, it is possible to grasp the failure occurring in the add / drop unit of each in-vehicle device by the failure detection unit.

  In the in-vehicle network system according to the present invention, when the in-vehicle device detects that the signal cannot be added by its own add / drop means, the signal to be added by the add / drop means corresponds to the spare network. An add process is performed by an add / drop means.

  According to the present invention, when the in-vehicle device detects that the signal cannot be added by its own add / drop means, the in-vehicle device adds the signal to be added by the add / drop means by the add / drop means corresponding to the backup network. Process. Therefore, even when signal transmission is interrupted by an add / drop unit that cannot perform add processing, a signal to be transmitted can be transmitted to a subsequent vehicle-mounted device via a spare network.

  The in-vehicle network system according to the present invention is characterized in that the spare network transmits a signal that can be cut off when a failure occurs in the in-vehicle device when the in-vehicle device has no failure. To do.

  According to the present invention, the standby network transmits a signal that can be cut off when a failure occurs in any of the in-vehicle devices during a normal operation in which the in-vehicle device has not failed. Therefore, when a failure occurs in any of the in-vehicle devices or any of the networks, it is possible to reduce the influence on the entire system by using the spare network.

  The in-vehicle network system according to the present invention is characterized in that in-vehicle devices classified into a multimedia system, a body system, a chassis system, and a power train system are connected to the plurality of networks, respectively.

  According to the present invention, it is possible to simplify the processing performed by each in-vehicle device by configuring each network with the in-vehicle devices classified into the multimedia system, the body system, the chassis system, and the powertrain system. It becomes.

  The in-vehicle network system according to the present invention is characterized in that the plurality of networks and the spare network are configured to transmit signals using light of different wavelengths.

  According to the present invention, a plurality of networks and a backup network transmit signals using light of different wavelengths, so that signals can be transmitted at high speed with a single optical fiber.

  In the present invention, at least one spare network capable of signal add / drop processing by all in-vehicle devices is provided, and when any failure occurs in any of a plurality of networks used in normal operation, the spare network is provided. Use. Therefore, it is not necessary to interrupt transmission of a signal that is scheduled to be transmitted through a network in which some kind of failure has occurred, and redundancy in the in-vehicle network system can be improved.

  In the present invention, when any failure occurs in the add / drop unit of any in-vehicle device, the location where the failure has occurred is avoided, and the signal to be transmitted is transmitted by the spare network, so that the signal of the It is possible to reliably transmit a signal to be transmitted without interrupting transmission.

  In the present invention, by grasping the failure that has occurred in the add-drop means of each in-vehicle device, even if any in-vehicle device has any failure, by operating each in-vehicle device appropriately, Thus, it is possible to reliably transmit a signal to be transmitted to the in-vehicle device in which the occurrence occurs.

  In the present invention, even when add-drop means that cannot be added is present in the in-vehicle device, add processing is performed on the spare network, and the signal that could not be added is transmitted to the subsequent in-vehicle device via the spare network. To do. Therefore, even if any of the add / drop units of the in-vehicle device cannot perform the add process, the signal can be reliably transmitted to the subsequent in-vehicle device by the add / drop unit that performs the add process on the spare network.

  In the present invention, the backup network transmits a signal that can be cut off when any of a plurality of networks used in normal operation is not available. Therefore, even if a failure occurs in any of a plurality of networks or in-vehicle devices and a spare network is used, and a signal transmitted through the spare network during normal operation is interrupted, the entire system is There is no impact. In addition, when a failure occurs in any of a plurality of networks or in-vehicle devices, the spare network can be used reliably, and there is no need to interrupt signal transmission. It can be transmitted reliably.

  In the present invention, the plurality of networks used during normal operation are respectively configured by in-vehicle devices classified into multimedia, body, chassis, and powertrain systems. Therefore, since the process performed by each in-vehicle device can be simplified, it is possible to reduce the burden in the design process of each in-vehicle device.

  In the present invention, a plurality of networks and a spare network transmit signals using light of different wavelengths, so that a plurality of signals transmitted by each of a plurality of networks configured by a plurality of in-vehicle devices are transmitted as one light. It is possible to transmit at high speed using a fiber, and it is possible to cope with the construction of a network composed of in-vehicle devices that are becoming more complicated.

  Below, the vehicle-mounted network system which concerns on this invention is explained in full detail based on drawing which shows the embodiment. FIG. 1 is a block diagram showing a configuration example of an in-vehicle network system according to the present invention. In FIG. 1, reference numeral 100 denotes an in-vehicle network system according to the present invention. In the in-vehicle network system 100 of the present embodiment, a plurality of in-vehicle devices 1, 2, 3, 4... Mounted on a vehicle and the gateway device 5 are connected by a single optical fiber cable 100a. The in-vehicle devices 1, 2, 3, 4... (In FIG. 1, the ECUs 1, 2, 3, 4,...) Have four LANs (networks) 101, 102, 103, 104 for each device that is strongly related to each other. It is connected to the.

  The first ECU 1, the second ECU 2, the third ECU 3, and the fourth ECU 4 shown in FIG. 1 may be any of the on-vehicle devices described above, or may be other devices. In the following description, the ECUs 1, 2, 3, and 4 are not specified as specific in-vehicle devices, and are described using the first ECU 1, the second ECU 2, the third ECU 3, and the fourth ECU 4 (sometimes collectively referred to as ECUs 1, 2, 3, and 4). To do.

Further, the in-vehicle network system 100 of the present embodiment includes a backup LAN 105 for backup to which all the in-vehicle devices 1, 2, 3, 4,. Each of the LANs 101, 102, 103, 104, and 105 is configured to transmit signals using light of different wavelengths, and multiplex communication is performed in the in-vehicle network system 100.
Each on-vehicle device 1, 2, 3, 4... Is connected to each LAN 101, 102, 103, 104 for each strongly related device, but only one LAN 101 (or 102, 103, 104) is connected. Instead, it can be connected to a plurality of LANs 101, 102, 103, 104 as required.

  In the in-vehicle network system 100 having such a configuration, the gateway device 5 mutually converts the communication standards used by the LANs 101, 102, 103, 104, and 105, so that the LANs 101, 102, 103, 104, and 105 are mutually converted. It is possible to perform signal transmission processing in between.

  In the in-vehicle network system 100 according to the present embodiment, the LAN 101 is a multimedia LAN 101 to which equipment related to an interface for a vehicle occupant is connected, and the LAN 102 is a body system to which equipment related to equipment in the vehicle is connected. The LAN 102 is a chassis LAN 103 to which devices for safely driving the vehicle are connected, and the LAN 4 is a power train LAN 104 to which control devices for driving the vehicle are connected.

  Examples of in-vehicle devices connected to the multimedia LAN 101 include a car navigation device and a car stereo. In FIG. 1, the first ECU 1, the second ECU 2, and the third ECU 3 are connected to the multimedia LAN 101. The in-vehicle devices connected to the body LAN 102 include, for example, a door ECU that controls a device related to a door, a seat ECU that controls a device related to a seat, an air conditioner ECU that controls a device related to an air conditioner, and the like. 1, a first ECU 1, a third ECU 3, and a fourth ECU 4 are connected.

  The in-vehicle devices connected to the chassis LAN 103 include, for example, an airbag ECU that controls devices related to an airbag, a collision sensor, and the like. In FIG. 1, a first ECU 1, a third ECU 3, and a fourth ECU 4 are connected. Examples of in-vehicle devices connected to the powertrain LAN 104 include an engine ECU that controls devices related to the engine, an ABS-ECU that controls devices related to the anti-lock brake system (ABS), and the like. 3ECU3 is connected.

  The multimedia LAN 101 is configured based on communication standards such as J1850, CAN (Controller Area Network), MOST (Media Oriented System Transport), IDB (Intelligent Transportation Systems Data Bus) 1394, and the like. Is configured in conformity with a communication standard such as CAN or LIN (Local Interconnect Network). Further, the chassis LAN 103 is configured in conformity with, for example, the FlexRay (registered trademark) standard, and the power train LAN 104 includes CAN, TTCAN (Time Triggered CAN), TTP / C (Time Triggered Protocol by CAN), FlexRay, It is configured in accordance with a communication standard such as LIN. The backup LAN 105 may be configured by appropriately selecting one of the communication standards described above.

  As described above, each in-vehicle device (ECU 1, 2, 3, 4,... In FIG. 1) is provided in the entire system 100 by configuring the LANs 101, 102, 103, and 104 for each device that is strongly related to each other. The number of ECUs can be reduced. Further, the harness including the optical fiber cable 100a can be shared among different vehicle types, and can be easily applied to model changes of each vehicle type.

  Although not shown, ECUs (Electronic Control Units) 1, 2, 3, and 4 are configured by a CPU (Central Processing Unit) or an MPU (Micro Processor Unit) or the like, and have a control unit having clock means and a control procedure of the control unit. A ROM that stores various control programs shown in advance and a RAM that temporarily stores various data generated when the control unit executes the control program are provided. Accordingly, the ECUs 1, 2, 3, and 4 realize various functions by the control units provided in the ECUs appropriately reading out and executing the control programs stored in the ROM into the RAM.

  Each of the ECUs 1, 2, 3, and 4 includes an interface for connecting to one or more of the multimedia LAN 101, the body LAN 102, the chassis LAN 103, and the powertrain LAN 104. Specifically, each of the ECUs 1, 2, 3, and 4 performs LAN 101, 102, 103, and 104 in order to add and drop one or a plurality of signals transmitted through the LANs 101, 102, 103, and 104, respectively. One or a plurality of add / drop units corresponding to 102, 103, and 104 are provided. All of the ECUs 1, 2, 3, and 4 are configured to perform add-drop processing on signals transmitted via the backup LAN 105.

  More specifically, as shown in FIG. 1, the first ECU 1 is transmitted via a body system LAN 102 and a first add / drop unit 11 that performs an add / drop process on a signal transmitted via the multimedia system LAN 101. A second add / drop unit 12 that performs an add / drop process on the incoming signal, a third add / drop unit 13 that performs an add / drop process on a signal transmitted via the chassis LAN 103, and a signal transmitted via the backup LAN 105. A fifth add / drop unit 15 for drop processing is provided. Therefore, the first ECU 1 cannot perform an add / drop process on a signal transmitted via the powertrain LAN 104.

  The second ECU 2 performs a first add / drop unit 21, a fourth add / drop unit 24, and a fifth add / drop that process the signals transmitted via the multimedia LAN 101, the power train LAN 104, and the backup LAN 105. The unit 25 is provided. Therefore, the second ECU 2 cannot perform an add / drop process on signals transmitted via the body LAN 102 and the chassis LAN 103.

  The third ECU 3 includes a first add / drop unit 31 and a second add unit that perform add / drop processing on signals transmitted through the multimedia LAN 101, the body LAN 102, the chassis LAN 103, the power train LAN 104, and the backup LAN 105, respectively. A drop unit 32, a third add / drop unit 33, a fourth add / drop unit 34, and a fifth add / drop unit 35 are provided. Therefore, the third ECU 3 can add / drop signals transmitted via all of the LANs 101, 102, 103, 104, and 105.

  The fourth ECU 4 includes a second add drop unit 42, a third add drop unit 43, and a fifth add drop unit 45 that perform add drop processing on signals transmitted through the body LAN 102, the chassis LAN 103, and the backup LAN 105. It has. Accordingly, the fourth ECU 4 cannot perform an add / drop process on signals transmitted via the multimedia LAN 101 and the powertrain LAN 104.

  FIG. 2 is an enlarged block diagram of a part of the in-vehicle network system 100 shown in FIG. The first add / drop unit 11 of the first ECU 1 sends a signal to a drop processing unit 11a that performs a drop process on a signal sent from the gateway device 5 via the multimedia LAN 101 and a second ECU 2 connected via the multimedia LAN 101. And an add processing unit 11b for performing the add process.

  The drop processing unit 11a includes, for example, a PD (Photo Diode), performs a demultiplexing process on a signal (optical signal) transmitted via the multimedia LAN 101, and takes in an optical signal having a specific wavelength. The add processing unit 11 b includes, for example, an LD (Laser Diode), performs a multiplexing process on an optical signal to be transmitted via the multimedia LAN 101, adds an optical signal having a specific wavelength, and transmits the optical signal.

  Add drop sections 12, 13, 15, 21, 24, 25, 31, 32, 33, 34, 35, 42, 43, 45 (respective reference numbers are provided below) provided in the ECUs 1, 2, 3, 4 respectively. May be omitted) has the same configuration as the first add-drop unit 11 of the first ECU 1 described above. Each of the ECUs 1, 2, 3, and 4 includes a signal processing unit (not shown) that performs predetermined signal processing on the signal dropped by each add / drop unit in addition to each add / drop unit.

  Here, in the in-vehicle network system 100 according to the present embodiment, each of the LANs 101, 102, 103, 104, and 105 sends signals to the ECUs 1, 2, 3, and 4 connected thereto in a preset order. Configured to transmit.

  Specifically, in the multimedia LAN 101, signals transmitted from the gateway device 5 are taken in the order of the first ECU1, the second ECU2, the third ECU3,. In the body LAN 102, signals transmitted from the gateway device 5 are taken in the order of the first ECU1, the third ECU3, the fourth ECU4,.

  In the chassis LAN 103, signals transmitted from the gateway device 5 are taken in the order of the first ECU1, the third ECU3, the fourth ECU4,. In the power train LAN 104, the signals transmitted from the gateway device 5 are taken in the order of the second ECU 2, the third ECU 3,. In the backup LAN 105, signals transmitted from the gateway device 5 are taken in the order of the first ECU1, the second ECU2, the third ECU3, the fourth ECU4,.

  Therefore, in the in-vehicle network system 100 of the present embodiment, the add drop units 11, 12, 13, 15, 21, 24, 25, 31, 32, 33, 34, 35, 42, When any of 43 and 45 cannot perform the add process or the drop process, the signal transmission is interrupted at the add / drop unit where the add process or the drop process cannot be performed. The reason why each add / drop unit cannot add a signal is the deterioration and failure of the LD of the add processing unit, and the reason why each add / drop unit cannot drop the signal is the deterioration and failure of the PD of the drop processing unit. Etc.

  Therefore, in the in-vehicle network system 100 according to the present embodiment, which of the ECUs 1, 2, 3 and 4 has an add / drop unit in which a drop processing unit or an add processing unit cannot process a signal (drop processing or add processing). A host device 6 to be managed is connected to the gateway device 5.

FIG. 3 is a block diagram illustrating a configuration example of the gateway device 5 and the host device 6 in the in-vehicle network system 100 according to the present embodiment.
The gateway device 5 is connected to the control unit 50, the ROM 51, the RAM 52, the multimedia LAN interface 53 for connecting to the multimedia LAN 101, the body LAN interface 54 for connecting to the body LAN 102, and the chassis LAN 103. Chassis LAN interface 55, power train LAN interface 56 for connecting to power train LAN 104, backup LAN interface 57 for connecting to backup LAN 105, communication interface 58 for connecting to host device 6 and the like. Each of which is connected to each other via a bus 50a.

  The control unit 50 is configured by a CPU, an MPU, or the like, controls the operation of each hardware unit as described above connected via the bus 50a, and appropriately reads a control program stored in the ROM 51 into the RAM 52 as appropriate. Execute. The ROM 51 stores in advance various control programs indicating the control procedure of the control unit 50, for example, communication control processing programs for mutually converting communication standards used in the LANs 101, 102, 103, 104, and 105. Yes. The RAM 52 is configured by SRAM, DRAM, or the like, and temporarily stores various data generated when the control unit 50 executes the control program.

  The control unit 50 reads out the communication control processing program stored in the ROM 51 to the RAM 52 and sequentially executes the program, for example, the multimedia LAN 101, the body LAN 102, the chassis LAN 103, the power train LAN 104, and the backup LAN 105. The communication standards used in each are converted to each other, and signal transmission processing between the LANs 101, 102, 103, 104, and 105 is performed.

  The host device 6 includes a control unit 60, a ROM 61, a RAM 62, a communication interface 63 for connecting to the gateway device 5, and the like, which are connected to each other via a bus 60a. The control unit 60 is configured by a CPU, an MPU, or the like, and controls the operation of each of the above-described hardware units connected via the bus 60a, and reads out a control program stored in the ROM 61 in advance to the RAM 62 as appropriate. Execute. Various control programs indicating the control procedure of the control unit 60 are stored in the ROM 61 in advance. The RAM 62 is configured by SRAM, DRAM, or the like, and temporarily stores various data generated when the control unit 60 executes the control program.

  Hereinafter, in the in-vehicle network system 100 having the above-described configuration, a process in which the host device 6 manages which add / drop unit of each of the ECUs 1, 2, 3, and 4 cannot perform the signal drop process or the add process can be described.

  Each of the ECUs 1, 2, 3, and 4 is configured to detect that the add processing unit or the drop processing unit of any of the add / drop units provided in itself is in a state where the add processing or the drop processing cannot be performed. Specifically, the control units of the ECUs 1, 2, 3, and 4 perform the signal drop processing by the drop processing unit of each add / drop unit provided in itself based on the result of the timing processing by its own clock means. If it is not performed for a predetermined time, it is detected that some failure has occurred in this drop processing unit or the add processing unit of the preceding ECU 1, 2, 3, 4.

  Further, the control units of the ECUs 1, 2, 3, and 4 have predetermined add processing units of the add drop units provided in the ECUs 1, 2, 3, and 4 on the basis of the results of the timing processing by their own clock means. When operating for a long time, it detects that the LD of this add processing unit has deteriorated and cannot transmit any more signals (occurrence of failure). Since the LD is surely deteriorated according to the operation time, such a determination can be made.

  When each ECU 1, 2, 3, 4 detects that a failure has occurred in the add processing unit or the drop processing unit of its own add / drop unit as described above, it notifies the host device 6 to that effect. Specifically, each ECU 1, 2, 3, 4 transmits a signal indicating that a failure has occurred in its add / drop unit to the gateway device 5 via the backup LAN 105, and the gateway device 5 6 is notified. Note that when all of the ECUs 1, 2, 3, and 4 have not failed and the in-vehicle network system 100 is operating normally, the backup LAN 105 transmits a signal that can be shut off at any time. Therefore, even if the signal as described above is appropriately interrupted, the entire system is not affected at all.

  Based on the notification from the gateway device 5 as described above, the control unit 60 of the host device 6 has trouble in the add processing unit (or drop processing unit) of which add / drop unit of which ECU 1 (or 2, 3, 4). It operates as a failure detection means for detecting whether or not a failure has occurred, and stores information indicating the detected content in the RAM 62.

Next, as described above, each of the LANs 101, 102, 103, 104 in the state where the host device 6 manages which add / drop unit of each ECU 1, 2, 3, 4 can no longer perform drop processing or add processing. A signal transmission process via the network will be described.
The host device 6 transmits, via the gateway device 5 and the backup LAN 105, the ECU 101 (or 2, 3, 4) having an add / drop unit in which a failure has occurred. 102, 103, and 104) are notified to the preceding or succeeding ECU 1 (or 2, 3, and 4).

Specifically, when a failure occurs in the add processing section of any add drop section of any ECU 1 (or 2, 3, 4), the ECU 2 (or 3, 4) following the add processing section is sent to Since the signal cannot be transmitted, the host device 6 sends the ECU 2 (or 3, 4) at the rear stage of the failed ECU 1 (or 2, 3, 4) to the ECU 1 (or 2, 3, 4) at the front stage. The add processing unit of which add drop unit is notified of the failure.
Further, when a failure occurs in the drop processing unit of any add drop unit of any ECU 1 (or 2, 3, 4), the transmission of the signal is interrupted by this drop processing unit, so the host device 6 The ECU 1 (or 2, 3) at the front stage of the ECU 1 (or 2, 3, 4) determines which of the add processing sections of the ECU 1 (or 2, 3, 4) at the rear stage has a failure. Notice. When a failure occurs in the drop processing unit in the first ECU 1, the host device 6 notifies the gateway device 5 to that effect.

  Each ECU 1, 2, 3, 4 drops when an add processing unit in one of its own add-drop units fails, or drops in any one of 1, 2, 3, 4's subsequent add-drop units When the host device 6 is notified that a failure has occurred in the processing unit, it was scheduled to be transmitted via the LAN 101 (or 102, 103, 104) in which signal transmission was interrupted due to the failure. The signal is subjected to add processing by an add processing unit connected to the backup LAN 105, thereby transmitting the signal to the subsequent ECUs 1, 2, 3, 4 through the backup LAN 105.

  Also, each ECU 1, 2, 3, 4 has an add drop unit in the case where a failure has occurred in the drop processing unit of any of its own add drop units, or any of the ECU 1, 2, 3, 4 of its previous stage. When the host apparatus 6 is notified that a failure has occurred in the add processing unit of the network, it is scheduled to be acquired via the LAN 101 (or 102, 103, 104) in which signal transmission is interrupted due to the occurrence of the failure. The signal is acquired via the backup LAN 105 by performing drop processing on the received signal by an add processing unit connected to the backup LAN 105.

  In the add / drop unit of any one of the ECUs 1, 2, 3, and 4, when a failure occurs in both the add processing unit and the drop processing unit at the same time, the host device 6 causes the ECU 1, 2, 3, and 3 in which the failure has occurred. 4 is notified to the ECUs 1, 2, 3, and 4 in both the first and second stages. Then, the ECUs 1, 2, 3, and 4 preceding the ECUs 1, 2, 3, and 4 in which the failure has occurred are signals that are scheduled to be transmitted via the LAN 101 (or 102, 103, and 104) in which signal transmission is interrupted. Are transmitted to the ECUs 1, 2, 3, and 4 in which the failure has occurred via the backup LAN 105. The ECUs 1, 2, 3, 4 in which the failure has occurred transmit signals acquired via the backup LAN 105 to the subsequent ECUs 1, 2, 3, 4 via the backup LAN 105. The subsequent ECUs 1, 2, 3, and 4 obtain a signal that is scheduled to be transmitted via the LAN 101 (or 102, 103, 104) in which signal transmission is interrupted, via the backup LAN 105.

  FIG. 4 is an explanatory diagram for explaining signal transmission processing. As shown in FIG. 4A, when a failure occurs in the add processing unit 11b of the first add / drop unit 11 of the first ECU 1 or the drop processing unit 21a of the first add / drop unit 21 of the second ECU 2, the multimedia system Transmission of signals at one location indicated by “x” on the LAN 101 is interrupted. In this case, a signal transmitted via the multimedia LAN 101 is transmitted as indicated by white arrows in FIG.

  Specifically, the first ECU 1 before the location where the failure occurred adds a signal to be added by the add processing unit 11b of the first add / drop unit 11 to the add processing unit 15b of the fifth add / drop unit 15. Then, a signal is transmitted to the second ECU 2 at the subsequent stage via the backup LAN 105. The second ECU 2 performs add processing on the signal dropped by the drop processing unit 25 a of the fifth add-drop unit 25 by the add processing unit 21 b of the first add-drop unit 21, and sends it to the subsequent third ECU 3 via the multimedia LAN 101. Transmit the signal. In the second ECU 2 and thereafter, signal transmission processing via the multimedia LAN 101 is performed as usual.

  As shown in FIG. 4B, in addition to the add processing unit 11b of the first add / drop unit 11 of the first ECU 1 or the drop processing unit 21a of the first add / drop unit 21 of the second ECU 2, the first add drop of the second ECU 2 When a failure occurs in the add processing unit 21b of the unit 21 or the drop processing unit 31a of the first add / drop unit 31 of the third ECU 3, signals are transmitted at two locations indicated by "x" on the multimedia LAN 101. Interrupted. In this case, a signal transmitted via the multimedia LAN 101 is transmitted as indicated by white arrows in FIG.

  Specifically, the first ECU 1 before the location where the failure occurred adds a signal to be added by the add processing unit 11b of the first add / drop unit 11 to the add processing unit 15b of the fifth add / drop unit 15. Then, a signal is transmitted to the second ECU 2 at the subsequent stage via the backup LAN 105. The second ECU 2 performs an add process on the signal subjected to the drop processing by the drop processing unit 25a of the fifth add / drop unit 25 by the add processing unit 25b of the fifth add / drop unit 25, and sends a signal to the subsequent third ECU 3 via the backup LAN 105. Is transmitted. The third ECU 3 performs drop processing by the drop processing unit 35a of the fifth add / drop unit 35 to obtain a signal. In the third ECU 3 and thereafter, signal transmission processing via the multimedia LAN 101 is performed as usual.

  As described above, in the in-vehicle network system 100 according to the present embodiment, all the in-vehicle devices (ECUs 1, 2, 3, and 4 in the present embodiment) are connected and the backup LAN 105 for transmitting a signal that can be shut off at any time is provided. And the use of the backup LAN 105 when signal transmission is interrupted due to some failure occurring in each of the LANs 101, 102, 103, 104, the entire system is not affected, and the in-vehicle network system 100 Redundancy can be improved. In the in-vehicle network system 100, when a plurality of spare backup LANs 105 are provided, the redundancy in the system can be further improved.

  In the above-described embodiment, the configuration has been described in which the host device 6 manages a failure that has occurred in each of the ECUs 1, 2, 3, and 4. However, the present invention is not limited to such a configuration, and the gateway device 5 has the function of the host device 6. The structure to be able to be used may be sufficient.

  Further, in the above-described embodiment, an example in which the backup LAN 105 is used only at a location where a failure has occurred in each of the LANs 101, 102, 103, 104 has been described. The backup LAN 105 may be switched, and a signal to be transmitted by the LAN 101 (or 102, 103, 104) in which a failure has occurred may be transmitted by the backup LAN 105.

It is a block diagram which shows the structural example of the vehicle-mounted network system which concerns on this invention. It is the block diagram which expanded a part of vehicle-mounted network system of FIG. It is a block diagram which shows the structural example of the gateway apparatus and host apparatus in the vehicle-mounted network system which concerns on this embodiment. It is explanatory drawing for demonstrating the transmission process of a signal.

Explanation of symbols

100 In-vehicle network system 101 Multimedia LAN
102 Body LAN
103 Chassis LAN
104 Powertrain LAN
105 LAN for backup
1, 2, 3, 4 ECU (on-vehicle equipment)
5 Gateway device 6 Host device 60 Control unit (failure detection means)

Claims (7)

In an in-vehicle network system having a plurality of networks to which a plurality of in-vehicle devices are connected,
Each of the in-vehicle devices has one or a plurality of add / drop units for performing an add / drop process on one or a plurality of signals transmitted through each network.
An in-vehicle network system comprising at least one spare network capable of signal add / drop processing by all in-vehicle devices. Each of the plurality of networks is configured to transmit signals in a preset order to a plurality of connected in-vehicle devices,
A failure detection means for detecting a failure that has occurred in any of the add-drop means included in any of the in-vehicle devices;
A vehicle-mounted device having an add-drop unit in which the failure detection unit has detected a failure, and a means for notifying the upstream and / or subsequent vehicle-mounted device on the network where the add-drop unit performs signal add-drop processing. ,
The in-vehicle device is
Means for transmitting a signal to be transmitted via the network to the subsequent in-vehicle device via the spare network when a failure occurs in the subsequent in-vehicle device on the connected network;
The apparatus according to claim 1, further comprising: means for acquiring a signal to be acquired via the spare network via the spare network when a failure occurs in an in-vehicle device on a previous stage on the connected network. In-vehicle network system.   When the in-vehicle device detects that the signal cannot be added and / or dropped by its own add / drop unit, and the unit detects that the signal cannot be added and / or dropped, the fault The vehicle-mounted network system according to claim 2, further comprising a means for notifying the detecting means.   When the in-vehicle device detects that the signal cannot be added by its own add / drop unit, the vehicle-mounted device adds the signal to be added by the add / drop unit by the add / drop unit corresponding to the spare network. The in-vehicle network system according to claim 3, wherein the in-vehicle network system is configured.   5. The spare network transmits a signal that can be cut off when a failure occurs in the in-vehicle device when no failure occurs in the in-vehicle device. The in-vehicle network system described in one.   The in-vehicle device classified into each of a multimedia system, a body system, a chassis system, and a powertrain system is connected to each of the plurality of networks, according to any one of claims 1 to 5. In-vehicle network system.   The in-vehicle network system according to any one of claims 1 to 6, wherein the plurality of networks and the backup network are configured to transmit signals using light of different wavelengths.

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