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US 6,208,249 B1Granted
Passenger detection system
AssigneeNEC Corporation
InventorsTakashi Saito, Masahiro Ofuji, Kazunori Jinno
Life of this patent
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AssigneeNEC Corporation
InventorsTakashi Saito, Masahiro Ofuji, Kazunori Jinno
Estimating the term…
A passenger detection system comprises an antenna electrode, an oscillation circuit, a current detection circuit, a phase difference detection circuit, and a control circuit. The antenna electrode is placed on the upper side of a seat. The oscillation circuit generates a high frequency low voltage oscillation signal in order to generate a weak alternating electric field around the antenna electrode. The current detection circuit detects a transmission current which passes between the oscillation circuit and the antenna electrode according to the weak alternating electric field which is generated around the antenna electrode. The phase difference detection circuit detects the phase difference between the oscillation signal supplied from the oscillation circuit and an output signal which is supplied to the antenna electrode. And the presence or absence of a passenger seated on the seat is judged by the control circuit based on the outputs of the current detection circuit and the phase difference detection circuit. Especially, the passenger detection system needs only one antenna electrode, therefore judgment on the presence or absence of a passenger seated on the seat can be executed with simplified circuit composition and low cost.
A passenger detection system comprising:
A passenger detection system comprising:
A passenger detection system comprising:
Dependencies are inferred from the claim text.