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On-vehicle DSRC apparatus

  • US 7,176,810 B2
  • Filed: 12/02/2003
  • Issued: 02/13/2007
  • Est. Priority Date: 04/23/2003
  • Status: Expired due to Fees
First Claim
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1. An on-vehicle DSRC apparatus employed for a dedicated short-range communication in an intelligent transport system, comprising:

  • a radio unit for performing communication with an on-road radio equipment installed at a location associated with a road;

    a data processing unit for processing data received from said radio unit;

    a battery for supplying an electric power to said radio unit and said data processing unit; and

    a first power switch inserted in a power supply line extending between said battery on one hand and said radio unit and said data processing unit on the other hand,wherein said first power switch is imparted with a function for effectuating a power save for control for the power supply from said battery so that electric energy of said battery can be saved,said on-vehicle DSRC apparatus further comprising;

    an electric field intensity detecting circuit for detecting a field intensity of radio wave transmitted from said on-road radio equipment;

    an activating circuit for activating said first power switch when a detection output of said electric field intensity detecting circuit becomes higher than a predetermined level inclusive thereof;

    a second power switch inserted in a power supply line extending between said battery and said electric field intensity detecting circuit for controlling the power supply to said electric field intensity detecting circuit from said battery; and

    a first timer for intermittently driving said second power switch.

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