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Method for adjusting a threshold value of a vehicle-mounted device employed in an automatic toll-collecting system

  • US 5,933,097 A
  • Filed: 05/22/1998
  • Issued: 08/03/1999
  • Est. Priority Date: 05/26/1997
  • Status: Expired due to Term
First Claim
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1. A method of controlling communication between components in an automatic toll-collecting system, comprising:

  • providing a vehicle-mounted device that is activated upon receipt of activating signals at or above a threshold signal level;

    providing a roadside device that selectively communicates with the vehicle-mounted device, and that includes a threshold-value adjusting device that is capable of adjusting the threshold signal level of the vehicle-mounted device;

    sending an activating signal from the roadside device to the vehicle-mounted device when the vehicle-mounted device is within a predetermined range of the roadside device;

    selectively adjusting the threshold level of the vehicle-mounted device based on the step of sending an activating signal; and

    sending a toll collecting signal, having a signal level closely corresponding to the adjusted threshold level of the vehicle-mounted device, from the roadside device to the vehicle-mounted device.

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