Communications: electrical – Vehicle detectors
Patent
1997-06-25
1999-03-16
Tong, Nina
Communications: electrical
Vehicle detectors
340941, 340942, 340988, 200 86A, 701117, G08G 101
Patent
active
058835857
ABSTRACT:
A system for detecting an object located on a travelling path even in bad weather or during nighttime in which conducting wires having a predetermined impedance value are laid along a travelling path, and a signal is supplied to the conducting wires from a signal source. If a vehicle exists on the path, the impedance of the conducting wires changes at the position where the vehicle is present. A signal reflected from the impedance change position is detected by a detector. The position of the vehicle can be determined from the timing of the received reflection signal. It is also possible to detect a vehicle changing lanes or the like by means of a plurality of conductive wires laid along the travelling path. Instead of a conducting wire, an optical fiber may be provided for determining the position of a vehicle using the refractive index change in the optical fiber due to the weight of the vehicle.
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Akutsu Eisaku
Ohkuwa Yoshihiro
Tong Nina
Toyota Jidosha & Kabushiki Kaisha
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