Vehicle-Mounted lan system, electronic control unit, relay connection unit, and vehicle-mounted lan communication means
1 Assignment
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Accused Products
Abstract
A vehicle-mounted LAN system comprises a plurality of vehicle-mounted LANs in each of which an electronic control unit is connected to a communication line to perform the transmission/reception of messages; and a relay connection unit that relays the messages between the vehicle-mounted LANs. Each electronic control unit has a reception port having a function of transmitting a reception confirmation signal to the relay connection unit in response to a received message. The relay connection unit has a relay management means that determines, based on the presence or absence of the reception confirmation signal responsive to the message relayed to each of the vehicle-mounted LANs, whether a relay is required or not and that then updates relay processing information stored in a storing means.
9 Citations
18 Claims
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1-9. -9. (canceled)
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10. A LAN system mounted on a vehicle comprising a plurality of LANs, mounted on said vehicle, each having at least one electronic control unit connected with a communication line to send and receive messages;
- and a relay connection unit, connected with said communication line, for relaying said messages between said LANs mounted on said vehicle,
wherein each of said electronic control units has a reception port having a function of sending a reception confirmation signal to said relay connection unit in response to said received message; and said relay connection unit has a relay management means for judging whether relay is necessary according to whether said reception confirmation signal has been sent in response to said message relayed to each of said LANs mounted on said vehicle, and updating relay processing information stored in a storing means. - View Dependent Claims (11, 12, 13, 14, 15)
- and a relay connection unit, connected with said communication line, for relaying said messages between said LANs mounted on said vehicle,
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16. An electronic control unit having a reception port connected to a LAN mounted on a vehicle, comprising:
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a recording means for recording identification information of a message to be received, wherein said reception port has a function of selectively receiving a message holding said identification information recorded in said recording means and sending a reception confirmation signal in response to said received message to a port which has sent said message.
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17. A relay connection unit, connected to a plurality of LANs mounted on a vehicle, for relaying messages between said LANs mounted on said vehicle, comprising:
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a storing means for storing relay processing information, of messages received through ports connected with each of said LANs mounted on said vehicle, indicating a relationship between identification information to be relayed and a relay port; a relay processing means for executing relay processing of a message having said identification information stored in said storing means; and a relay management means for judging whether relay is necessary according to whether a reception confirmation signal has been sent in response to said message relayed to each of said LANs mounted on said vehicle, and updating relay processing information stored in said storing means.
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18. A communication means connected to a LAN mounted on a vehicle, comprising:
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a recording means for recording identification information of a message to be received; an identification reception processing means, composed of a hardware, for sequentially comparing identification information of a message being received with identification information recorded in said recording means and suspending reception of a message which is not coincident with said identification information recorded in said recording means; and a reception confirmation responding means for sending a reception confirmation signal in response when said reception confirmation responding means is capable of correctly receiving said message holding said identification information recorded in said recording means.
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Specification