JP2004310149A - Data transmission control method, onboard communication system and connecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a data transmission control method, an onboard communication system and a connecting device capable of improving stability by preventing the transmission of abnormal data or unexpected data from external equipment to an onboard communication network. <P>SOLUTION: This onboard communication system is equipped with a connecting device 10 connecting external equipment 40 to the onboard communication network for performing data transmission between the connected external equipment 40 and the onboard communication network. The connecting device 10 is provided with: a flash memory 14 for storing the classification of data whose transmission from the external equipment 40 to the onboard communication network is permitted; and a CPU 12 for deciding whether the classification of the data to be transmitted is stored in the flash memory 14. When the CPU 12 decides that the classification of the data is not stored, the transmission of the data is inhibited. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a data transmission control method for controlling transmission of data received from an external device to the in-vehicle communication network by a connection device for connecting the external device to the in-vehicle communication network, and a connection device for connecting the external device to the in-vehicle communication network. The present invention relates to an in-vehicle communication system provided and a connection device for connecting an external device to an in-vehicle communication network.
[0002]
[Prior art]
2. Description of the Related Art In vehicles such as automobiles, an on-vehicle communication network in which various on-vehicle devices are connected has been frequently constructed (for example, see Patent Document 1). Further, by providing a connection device having a connection unit to which an external device is connected in the vehicle-mounted communication network, it is possible to perform data transmission from the external device to the vehicle-mounted communication network.
[0003]
[Patent Document 1]
JP-A-2002-22467
[0004]
[Problems to be solved by the invention]
When a connection device is provided, data can be transmitted from various external devices to the in-vehicle communication network.However, the data transmitted from the external devices is various, and is abnormal data or unexpected data for the in-vehicle communication network. Data may be transmitted. The in-vehicle communication network receiving abnormal data or unexpected data from an external device may cause troubles such as unstable operation of the system.
[0005]
The present invention has been made in view of the above circumstances, and prevents abnormal data or unexpected data transmission from an external device to an in-vehicle communication network by limiting the type of data to be transmitted to the in-vehicle communication network. It is another object of the present invention to provide a data transmission control method, a vehicle-mounted communication system, and a connection device capable of improving stability.
[0006]
Further, the present invention, by limiting the type and destination of data transmitted to the in-vehicle communication network, to prevent transmission of abnormal data or unexpected data from external devices to in-vehicle devices in the in-vehicle communication network, Another object of the present invention is to provide a connection device capable of improving stability.
[0007]
Also, the present invention provides a new on-vehicle device for handling data of a new type by updating the type of data permitted to be transmitted to the on-vehicle communication network or the combination of the type and the transmission destination stored in the storage unit. Another object of the present invention is to provide an in-vehicle communication system and a connection device that can support a new external device.
[0008]
Another object of the present invention is to provide a connection device that can safely update the type or the combination of the type and the transmission destination stored in the storage unit.
[0009]
[Means for Solving the Problems]
A data transmission control method according to a first invention is a data transmission control method for controlling transmission of data received by a connection unit for connecting an external device included in a connection device connected to a vehicle-mounted communication network to the vehicle-mounted communication network. The connection device is provided with a storage unit for storing the type of data permitted to be transmitted, and the connection device determines whether the type of data received by the connection unit is stored in the storage unit. When it is determined that the data type is not stored in the storage unit, the connection device prohibits the transmission of the received data.
[0010]
The in-vehicle communication system according to a second aspect of the present invention is the in-vehicle communication system for transmitting data received by a connection unit for connecting an external device included in a connection device connected to the in-vehicle communication network to the in-vehicle communication network. The apparatus includes a storage unit that stores a type of data permitted to be transmitted, and a determination unit that determines whether the type of the data received by the connection unit is stored in the storage unit. If it is determined that the type of the received data is not stored in the storage unit, the transmission of the received data is prohibited.
[0011]
In the vehicle-mounted communication system according to a third aspect, in the second aspect, the vehicle-mounted communication network includes an in-vehicle device that transmits update data of a type stored in the storage unit, and the connection device includes: Receiving means for receiving the update data transmitted by the receiving means, and updating means for updating the type stored in the storage unit based on the update data received by the receiving means.
[0012]
A connection device according to a fourth aspect of the present invention includes a first connection unit connected to an in-vehicle communication network, and a second connection unit connected to an external device, and the first connection of data received by the second connection unit. A connection unit for transmitting data from the unit, a storage unit for storing a type of data permitted to be transmitted, and a determination unit for determining whether the type of data received by the second connection unit is stored in the storage unit And wherein when the determination unit determines that the type of the received data is not stored in the storage unit, transmission of the received data is prohibited.
[0013]
A connection device according to a fifth aspect of the present invention includes a first connection unit connected to an in-vehicle communication network, and a second connection unit connected to an external device, and the first connection of data received by the second connection unit. In the connection device that performs transmission from the unit, a storage unit that stores a combination of the type of data permitted to be transmitted and the transmission destination, and a combination of the type of data and the transmission destination that is received by the second connection unit are stored in the storage unit Determining means for determining whether or not the received data type and transmission destination combination are not stored in the storage unit, and prohibiting the transmission of the received data. It is characterized by having such a configuration.
[0014]
The connection device according to a sixth invention, in the fourth or fifth invention, a receiving unit that receives update data of the type stored in the storage unit or the combination of the type and the transmission destination from the first connection unit, Updating means for updating the type stored in the storage unit or a combination of the type and the transmission destination based on the update data received by the receiving means.
[0015]
The connection device according to a seventh aspect of the present invention is the connection device according to the sixth aspect, wherein the data transmission is stopped while the updating unit is updating the type stored in the storage unit or the combination of the type and the transmission destination. It is characterized by comprising.
[0016]
In the first, second, or fourth invention, the connection device includes a storage unit that stores a type of data that is permitted to be transmitted, and stores the type of data received by the connection unit (second connection unit). The determination means determines whether or not the data is stored in the storage device. If it is determined that the data is not stored, the transmission of the received data is prohibited. Only the data of the type stored in the storage unit is transmitted to the in-vehicle communication network. Since the type of data transmitted to the in-vehicle communication network is restricted, abnormal or unexpected data transmitted by external devices will not be transmitted to the in-vehicle communication network, and the system will be affected by abnormal or unexpected data. Can be prevented from becoming unstable.
[0017]
In the fifth invention, the connection device includes a storage unit for storing a combination of the type of data permitted to be transmitted and a combination of the transmission destination, and stores the combination of the type of data and the transmission destination received by the connection unit in the storage unit. The determination means determines whether or not the data has been stored. If it is determined that the data has not been stored, the transmission of the received data is prohibited. For each in-vehicle device in the in-vehicle communication network, only the type and transmission destination data stored in the storage unit are transmitted. Because the types and destinations of data transmitted to each in-vehicle device in the in-vehicle communication network are restricted, abnormal or unexpected data transmitted by external devices will be transmitted to unrelated in-vehicle devices in the in-vehicle communication network. It is possible to prevent the operation of the in-vehicle device or the entire system from becoming unstable due to abnormal data or unexpected data without being transmitted.
[0018]
In the third or sixth aspect, the receiving unit receives, from the vehicle-mounted communication network, update data of the type stored in the storage unit or the combination of the type and the transmission destination, and based on the received update data, The type stored in the storage unit or the combination of the type and the transmission destination is updated by the updating unit. The external device may transmit various types of data, and the in-vehicle communication network may need to support new types of data. When dealing with data of a new type, it is necessary to add a new type to the storage unit. However, it is possible to add a new type to the storage unit by the updating unit and cope with it. Further, the configuration of the in-vehicle communication network does not change much and is almost fixed. However, there are cases where in-vehicle devices are added or removed. When the configuration of the in-vehicle communication network changes, the setting related to the transmission destination is often changed, and it is necessary to update the transmission destination unit of the combination of the type and the transmission destination stored in the storage unit. It is possible to update the destination part stored in the storage unit by the means. By updating the type or the combination of the type and the transmission destination stored in the storage unit, it is possible to correspond to a new in-vehicle device added to the in-vehicle communication network or an external device that transmits new data.
[0019]
In the seventh aspect, data transmission is stopped while the updating unit is updating the type stored in the storage unit or the combination of the type and the destination (hereinafter, storage unit information). Since data transmission cannot be performed while the storage unit information is being updated, the data transmission is stopped before updating the storage unit information. In addition, if an attempt is made to execute data transmission while the storage unit information is being updated, there is a possibility that an abnormality may occur. Therefore, the connection device does not accept data transmission while the storage unit information is being updated. The storage unit information can be updated in a safe state.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be specifically described with reference to the drawings showing the embodiments.
FIG. 1 shows an example of an in-vehicle communication system including a connection device according to the present invention. The in-vehicle communication system includes an in-vehicle communication network having a DVD (Digital Video (Versatile) Disk) drive 30, an audio device 32, a navigation device 34, a display 36, a touch panel 38, and the like, and a connection device 10 connected to the in-vehicle communication network. Have. An external device 40 brought into the vehicle can be connected to the connection device 10.
[0021]
In this description, an in-vehicle communication network compliant with IEEE (Institute of Electrical and Electronic Engineers) 1394 will be described as an example. Each of the in-vehicle devices 30, 32, 34, 36, and 38 of the in-vehicle communication network, the connection device 10, and the external device 40 include a communication controller compliant with IEEE 1394, and can perform communication compliant with IEEE 1394. The on-vehicle devices 30, 32, 34, 36, 38 and the connection device 10 of the on-vehicle communication network are daisy-chain connected.
[0022]
The connection apparatus 10 includes a CPU (Central Processing Unit) 12, a flash memory (storage unit) 14, a RAM (Random Access Memory) 16, a ROM (Read Only Memory) 18, a communication controller 20, and the like. It is connected. The communication controller 20 is connected with an internal connector (first connection portion) 24 and an external connector (connection portion, second connection portion) 22. The internal connector 24 is connected to a vehicle-mounted communication network, and the external connector 22 is connected to the external connector 22. Is connected to an external device 40. The communication controller 20 performs data transmission between the in-vehicle communication network and the external device 40 in accordance with the IEEE 1394 standard.
[0023]
The in-vehicle devices connected to the in-vehicle communication network are rarely changed and are almost fixed. Therefore, it is also possible to fix the setting of the channel used for isochronous transmission or the 1394 address used for asynchronous transfer. In this description, the channels (channel numbers) of the DVD drive 30, the audio device 32, the navigation device 34, the display 36, and the touch panel 38 are "1", "2", "3", "4", and "5", respectively. It is assumed that each 1394 address is fixed to “1”, “2”, “3”, “4”, and “5”, respectively.
[0024]
The flash memory 14 operates as a storage unit that stores a combination of a type of data permitted to be transmitted from the external device 40 to the in-vehicle communication network and a transmission destination. In this description, the transmission permission information including the combination of the type of transmission permission and the transmission destination is stored in the flash memory 14. FIG. 2 shows an example of the transmission permission information. In IEEE 1394, it is possible to acquire device information about devices in a network by using, for example, an AV / C (Audio / Video Control) protocol defined by 1394 TA (Trade Association). Based on the device information, for example, it is possible to identify that the device is a video device or an audio device. In the present description, as shown in FIG. 2, the transmission permission information includes a plurality of transmission permission tables for each type of in-vehicle device. For example, the transmission permission information includes a transmission permission table for video equipment and a transmission permission table for audio equipment.
[0025]
In each transmission permission table, a combination of a type of data permitted to be transmitted and a channel to be used or a 1394 address (transmission destination) is registered. For example, in the example of FIG. 2, channels (or 1394 addresses) 2 and 4 are registered in the transmission permission table for video equipment as the type of video / audio system, and the channel (or 1394 address) as the type of control system. 5) is registered. Here, the channel does not directly specify the transmission destination, but if the channel is determined, the transmission destination is also determined.
[0026]
The type and destination (channel or 1394 address) of the transmission data transmitted from the external device 40 to the connection device 10 can be obtained from header information or control information of the data (packet) received by the communication controller 20. is there. For example, a destination ID (Destination ID) of an isochronous packet can be used for identification of a transmission destination, and a transaction code (tcode) can be used for identification of a type.
[0027]
The CPU 12 operates as a unit (determination unit) for determining whether or not the combination of the type and the transmission destination of the transmission data received from the external device 40 is stored (registered in the transmission permission information) in the flash memory 14. If it is determined that there is no transmission data, the transmission of the received transmission data is prohibited. The communication controller 20 operates as a unit (accepting unit) that receives update data of transmission permission information (a combination of a type and a transmission destination) from the vehicle-mounted communication network, and the CPU 12 transmits the update data received by the communication controller 20 to the update data. Based on this, it operates as a means (updating means) for updating the transmission permission information stored in the flash memory 14. The CPU 12 stops the data transmission while updating the transmission permission information.
[0028]
The CPU 12 reads and executes a program stored in the ROM 18 to operate as each unit described above and execute various processes related to data transmission.
[0029]
Next, data transmission from the external device 40 to the in-vehicle communication network using the connection device 10 according to the present invention will be described. In this description, digital video will be described as an example of the external device 40.
[0030]
FIG. 3 shows an example of a data transmission procedure from the external device 40 to the in-vehicle communication network. When the external device 40 is connected to the external connector 22 of the connection device 10, each vehicle-mounted device and the connection device 10 of the vehicle-mounted communication network recognize the connection of the external device (digital video) 40 by performing a bus reset or the like. (S10). In IEEE 1394, the device information of the external device 40 can be obtained by using AV / C, and the connection device 10 obtains the device information of the external device 40 (S12). The device information acquired by the connection device 10 is stored in the RAM 16 under the control of the CPU 12.
[0031]
The CPU 12 of the connection device 10 selects a transmission permission table corresponding to the acquired device information from the transmission permission information (S14), and reads the selected table into the RAM 16. In this description, since the external device 40 is a digital video, the CPU 12 determines that the external device 40 is a video device based on the device information, selects a transmission permission table corresponding to the video device, and reads the table into the RAM 16.
[0032]
By operating a reproduction switch of the external device (digital video) 40, video data including video data and audio data is transmitted from the external device 40 to the connection device 10. Further, for example, when the touch panel 38 recognizes the external device 40 and becomes operable after the bus reset, by operating the play button on the touch panel 38, the video data including the video data and the audio data is transmitted. The data is transmitted from the external device 40 to the connection device 10.
[0033]
When the connection device 10 receives the transmission data from the external device 40 (S16: YES), the communication controller 20 sends the CPU 12 the header information of the transmission data (transmission packet) and the transmission permission determination request. The CPU 12 that has received the header information and the transmission permission determination request obtains the type and channel of the received transmission data from the header information (S18), and stores them in the RAM 16. The CPU 12 compares the type and the use channel stored in the RAM 16 with the transmission permission table, and determines whether the type and the use channel of the received transmission data are registered in the transmission permission table (stored in the flash memory 14). Is determined. If the type and the used channel are registered in the transmission permission table (S20: YES), the communication controller 20 is given a permission response to transmit the received transmission data (S22). For example, when the type is video / audio and the used channel is “2” or “4”, the transmission data is transmitted to the audio device 32 and the display 36.
[0034]
If the type and the channel to be used are not registered in the transmission permission table (S20: NO), the CPU 12 gives a discard response to the communication controller 20 to discard the received transmission data (S24). For example, if the type is video / audio and the used channel is “1” or “3”, the transmission data is discarded. Also, when the type is not registered in the transmission permission table, the transmission data is discarded.
[0035]
In the above-described embodiment, the CPU 12 determines whether the type of transmission data and the channel (or 1394 address) to be used are registered in the transmission permission information (stored in the flash memory 14). As in the case of the connection device 28, the determination can be performed by a determination device (determination means) 26 instead of the CPU 12 of the connection device 10 shown in FIG. The determination device 26 is connected between the communication controller 20 and the bus, and performs the above determination in the same manner as the CPU 12 of the connection device 10 shown in FIG. 1 described above.
[0036]
Each of the in-vehicle devices 30, 32, 34, 36, and 38 of the in-vehicle communication network is almost fixed, but there are cases where the in-vehicle devices are added or removed. When an in-vehicle device is added or removed, the channel or 1394 address of the transmission permission information (transmission permission table) needs to be updated. Further, the external device 40 may transmit various types of data. For example, it may be necessary to transmit a new video format or a new audio format from the external device 40 to the vehicle-mounted communication network. When transmitting data in a new format, it is necessary to update the type of transmission permission information (transmission permission table).
[0037]
FIG. 5 shows an example of a procedure for updating the transmission permission information (combination of type and transmission destination). In many cases, the DVD drive 30 can also read a CD-ROM. In this description, the case where the touch panel 38 is operated to update the transmission permission information using the update data stored in the CD-ROM is described. The description will be given by way of example.
[0038]
For example, by operating an update button in the touch panel 38, an update request is transmitted from the touch panel 38 to the connection device 10 (S30). The communication controller 20 that has received the update request sends the update request to the CPU 12. Upon receiving the update request, the CPU 12 prepares for update (S32). For example, since data transmission cannot be performed during updating, a process of interrupting the ongoing data transmission is performed. When the update preparation is completed, the CPU 12 notifies the touch panel 38 of the preparation completion from the communication controller 20 (S34).
[0039]
The touch panel 38 that has received the preparation completion notification from the connection device 10 requests the DVD drive 30 to transmit update data. The DVD drive 30 that has received the transmission request from the touch panel 38 reads out the update data from the CD-ROM and transmits it to the connection device 10 (S36). The update data transmitted from the DVD drive 30 is stored in the RAM 16 under the control of the CPU 12 via the communication controller 20, and the CPU 12 updates the transmission permission information of the flash memory 14 using the update data stored in the RAM 16 ( S38).
[0040]
After the update is completed, the CPU 12 notifies the touch panel 38 of the update completion from the communication controller 20 (S40), and displays the update completion (S42).
[0041]
FIG. 6 shows another example of the procedure for updating the transmission permission information. For example, by operating an update button in the touch panel 38, an update request is transmitted from the touch panel 38 to the connection device 10 (S50). The communication controller 20 that has received the update request sends the update request to the CPU 12. Upon receiving the update request, the CPU 12 switches to the update mode (S52). The update mode is an operation mode in which only update processing is performed and data transmission and the like are not performed. When the switching to the update mode is completed, the CPU 12 notifies the touch panel 38 of the completion of the switching from the communication controller 20 (S54).
[0042]
The touch panel 38 receiving the notification of the completion of the switching from the connection device 10 requests the DVD drive 30 to transmit update data. The DVD drive 30 that has received the transmission request from the touch panel 38 reads out the update data from the CD-ROM and transmits it to the connection device 10 (S56). The update data transmitted from the DVD drive 30 is stored in the RAM 16 under the control of the CPU 12 via the communication controller 20, and the CPU 12 updates the transmission permission information of the flash memory 14 using the update data stored in the RAM 16 ( S58).
[0043]
After the update is completed, the CPU 12 notifies the touch panel 38 of the update completion from the communication controller 20 (S60). The touch panel 38 accepts the presence or absence of another update data, and if there is another update data (S62: YES), performs the above-described update processing (S56, S58, S60). If there is no other update data (S62: NO), the touch panel 38 transmits an update end request to the connection device 10 (S64). The communication controller 20 that has received the update end request sends an update end request to the CPU 12. Upon receiving the update end request, the CPU 12 releases the update mode (S66). When the release of the update mode is completed, the CPU 12 notifies the release completion to the touch panel 38 from the communication controller 20 (S68), and displays the completion of the update (S70).
[0044]
In the above-described update process, the update data stored in the CD-ROM is read out by the DVD drive 30 and transmitted to the connection device 10. If the communication device can be connected, the communication device can download update data from a predetermined server and transmit the data to the connection device 10.
[0045]
Further, in the above-described embodiment, one external connector 22 is provided in the connection device 10, but a plurality of external connectors 22 may be provided. Further, in the above-described embodiment, the combination of the type and the transmission destination (channel or 1394 address) is registered in the transmission permission information (stored in the flash memory 14), but it is also possible to register only the type. In this case, only data of the type assumed in advance is transmitted from the external device to the in-vehicle communication network.
[0046]
【The invention's effect】
According to the first, second or fourth aspect of the present invention, the type of data transmitted to the in-vehicle communication network is limited by the determination means to the type stored in the storage unit. Data or unexpected data is not transmitted in the vehicle-mounted communication network, and it is possible to prevent the operation of the system from becoming unstable due to abnormal data or unexpected data.
[0047]
According to the third, sixth or seventh aspect, the type stored in the storage unit or the combination of the type and the transmission destination can be updated by the updating unit, and the data of the new type or the new type of the in-vehicle communication network can be updated. It is possible to correspond to the configuration. In addition, while updating the type stored in the storage unit or the combination of the type and the transmission destination, the data transmission is stopped, so that the type stored in the storage unit or the type and the transmission destination are not transmitted. The combination can be updated safely.
[0048]
According to the fifth aspect, the type and transmission destination of the data transmitted to each in-vehicle device in the in-vehicle communication network are limited by the determination unit to the combination of the type and the transmission destination stored in the storage unit. Therefore, abnormal or unexpected data transmitted by the external device is not transmitted to unrelated in-vehicle devices in the in-vehicle communication network. Can be prevented.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating an example of a vehicle-mounted communication system including a connection device according to the present invention.
FIG. 2 is a diagram illustrating an example of transmission permission information.
FIG. 3 is a flowchart illustrating an example of a data transmission procedure from an external device to a vehicle-mounted communication network.
FIG. 4 is a block diagram showing another example of the connection device.
FIG. 5 is a flowchart illustrating an example of a procedure for updating transmission permission information.
FIG. 6 is a flowchart illustrating another example of a procedure for updating transmission permission information.
[Explanation of symbols]
10, 28 Connecting device
12 CPU
14 Flash memory
20 Communication controller
22 External connector
24 Internal connector
26 Judgment device
40 External equipment

Claims (7)

A data transmission control method for controlling transmission of data received by a connection unit for external device connection included in a connection device connected to the vehicle-mounted communication network to the vehicle-mounted communication network,
The connection device is provided with a storage unit that stores a type of data permitted for transmission,
The connection device determines whether the type of data received by the connection unit is stored in the storage unit,
A data transmission control method, characterized in that when determining that the type of the received data is not stored in the storage unit, the connection device prohibits the transmission of the received data. An in-vehicle communication system that transmits data received by a connection unit for connecting an external device included in a connection device connected to the in-vehicle communication network to the in-vehicle communication network,
The connection device,
A storage unit for storing a type of data permitted to be transmitted;
Determining means for determining whether or not the type of the data received by the connection unit is stored in the storage unit, wherein the determination unit determines that the type of the received data is not stored in the storage unit , Wherein the transmission of the received data is prohibited. The in-vehicle communication network has an in-vehicle device that transmits update data of a type stored in the storage unit,
The connection device,
Receiving means for receiving the update data transmitted by the in-vehicle device,
3. The in-vehicle communication system according to claim 2, further comprising: updating means for updating the type stored in the storage unit based on the update data received by the receiving means. A connection device comprising: a first connection unit connected to an in-vehicle communication network; and a second connection unit connected to an external device, and transmitting data received by the second connection unit from the first connection unit. ,
A storage unit for storing a type of data permitted to be transmitted;
Determining means for determining whether or not the type of the data received by the second connection unit is stored in a storage unit, wherein the determination unit determines that the type of the received data is not stored in the storage unit A connection device configured to prohibit the transmission of the received data when the connection is made. A connection device comprising: a first connection unit connected to an in-vehicle communication network; and a second connection unit connected to an external device, and transmitting data received by the second connection unit from the first connection unit. ,
A storage unit for storing a combination of a type of data permitted to be transmitted and a transmission destination,
Determining means for determining whether or not the combination of the type of data and the transmission destination received by the second connection unit is stored in a storage unit, wherein the determination means determines the combination of the type of the received data and the transmission destination Is configured to prohibit the transmission of the received data when it is determined that the data is not stored in the storage unit. A receiving unit that receives, from the first connection unit, update data of a type stored in the storage unit or a combination of a type and a transmission destination;
6. An update unit for updating a type stored in the storage unit or a combination of a type and a transmission destination based on the update data received by the reception unit. Connection device. 7. The data transmission apparatus according to claim 6, wherein the updating unit is configured to stop data transmission while updating the type stored in the storage unit or the combination of the type and the transmission destination. Connection device.

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