Method for adjusting a threshold value of a vehicle-mounted device employed in an automatic toll-collecting system
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United States of America Patent
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-
Aug 3, 1999
Grant Date -
N/A
app pub date -
May 22, 1998
filing date -
May 26, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A vehicle-mounted device that enables adjustment by wireless communication from an external portion, of a threshold value employed for detecting strength of a radio wave emitted from a roadside device. A vehicle-mounted device is disposed within an electromagnetic-shield box, and radio waves for activating use are sent from an antenna within the electromagnetic-shield box to the vehicle-mounted device. The vehicle-mounted device, when activated by this radio wave for activating use, sends an activation acknowledgement signal. A computer determines whether the vehicle-mounted device has been activated according to the presence or absence of the activation acknowledgement signal. The computer sends a radio wave from the antenna to the vehicle-mounted device to set a threshold value in correspondence to the presence or absence of this activation, and sets the threshold value of the vehicle-mounted device. These operations are performed repeatedly to adjust the threshold value of the vehicle-mounted device to an appropriate value.
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