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Automobile multiple communication system operable under low power consumption

  • US 5,554,978 A
  • Filed: 02/19/1993
  • Issued: 09/10/1996
  • Est. Priority Date: 02/21/1992
  • Status: Expired due to Term
First Claim
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1. A multiplex communication system used in an automobile, comprising:

  • a parent station having at least judging means for judging whether or not a present communication mode of said multiplex communication system corresponds to one of a normal communication mode and a low-power-consumption mode;

    at least one child station including;

    detection means for detecting that a supply of power to said child station is instantaneously interrupted, thereby producing a detection signal, andcompulsorily condition changing means for compulsorily changing a present operation condition of said child station into a low-power-consumption operation condition in response to said detection signal;

    a communication line for mutually connecting said parent station and said child station;

    means for changing the present operation condition of said child station into the normal communication mode;

    whereby when said judging means judges that the present communication mode of the multiplex communication system corresponds to said normal communication mode, said judging means sets operation conditions of said child station and said parent station to normal operation conditions so as to perform a communication between said child station and said parent station, andwhen said judging means judges that the present communication mode of the multiplex communication system corresponds to said low-power-consumption communication mode, said judging means transmits to said child station, an instruction for changing the present operation condition of said child station into the low-power-consumption operation condition, thereby bringing both of said child station and said parent station into the low-power-consumption operations in addition to said compulsorily condition changing operation by said compulsorily condition changing means.

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