Method for adjusting a threshold value of a vehicle-mounted devi

Details Method for adjusting a threshold value of a vehicle-mounted devi Method for adjusting a threshold value of a vehicle-mounted devi

1998-05-22

1999-08-03

Crosland, Donnie L.

Communications: electrical

Traffic control indicator

Combined

340901, 340905, 34082554, 235384, 455 87, 455575, 4551521, G08B 100, H04B 140

Patent

active

059330970

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.

REFERENCES:
patent: 4870419 (1989-09-01), Baldwin et al.
patent: 5386589 (1995-01-01), Kanai
patent: 5613230 (1997-03-01), Gottfried et al.
patent: 5686920 (1997-11-01), Hurta et al.
patent: 5790940 (1998-08-01), Laborde et al.

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