Capacitive occupant detection system
AssigneeDenso Corporation
InventorHajime Nakagawa
Life of this patent
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Abstract
A capacitive occupant detection system comprises a capacitive sensor and a seat frame located under the capacitive sensor through a seat cushion. The seat frame is electrically connected with the ground potential level of the vehicle. A water proof layer is placed above the seat frame. The water proof layer prevents water from penetrating the seat cushion to reach to the seat frame, even if water poured on the seating part. The water proof layer suppresses resistance decrease of resistive component between the capacitive sensor and the seat frame resulting from water poured on the seat.
Claims11
A capacitive occupant detection system which detects a condition on a seat based on a current or voltage according to differences of a weak electric field generated between a ground potential level of a vehicle and an electrode arranged inside the seat of the vehicle, comprising:
- a capacitive sensor provided as the electrode;
- a seat frame located under the capacitive sensor through a seat cushion and electrically connected with the ground potential level of the vehicle;
- and
- means for suppressing decrease in resistance of resistive component between the capacitive sensor and the seat frame, the resistance decrease resulting from water poured on the seat.
Dependencies are inferred from the claim text.