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On-vehicle data communication system and method

  • US 5,697,048 A
  • Filed: 10/16/1995
  • Issued: 12/09/1997
  • Est. Priority Date: 10/20/1994
  • Status: Expired due to Fees
First Claim
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1. An on-vehicle data communication system comprising at least one master unit, a plurality of slave units and a communication bus for connecting said master unit and said slave units,each of said slave units comprising:

  • a first receiving means for receiving broadcast communication data through said communication bus;

    a first judgement means for judging whether or not said first receiving means failed to normally receive the broadcast communication data which are supposed to be received by said first receiving means; and

    a first transmission means for transmitting acknowledge data to indicate a failure in reception of said first receiving means if said first judgement means judges that said first receiving means failed to normally receive, and not transmitting said acknowledged data if said first judgement means does not judge that said first receiving means failed to normally receive;

    said master unit comprising;

    a second transmission means for transmitting the broadcast communication data to said slave units;

    a second receiving means for receiving the transmitted acknowledge data;

    a second judgement means for judging whether or not the acknowledge data corresponding to the transmitted broadcast communication data are received by said second receiving means; and

    a process control means for performing a predetermined process to cope with the failure of said first receiving means if said second judgement means judges that the acknowledge data are received; and

    said broadcast communication data comprise a header portion indicating a head of the broadcast communication data, a talker address field indicating an address of said master unit, a listener address field indicating an address of each of said slave units, a control field indicating the kind of broadcast communication data, a data length field for specifying a data length of the broadcast communication data and a data field for transmitting and receiving substantial data.

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