Capacitive occupant detection system
First Claim
1. 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;
whereinthe seat includes a seating part, a back rest part, and a joint part which connects the seating part and the back rest part, andthe suppressing means includes the seat cushion of the seating part having an upper surface which defines a plurality of grooves arranged with predetermined intervals, the grooves being formed to extend in and to be sloped along a direction between a front end of the seating part and the joint part, the upper surface of the seat cushion including surfaces of the grooves being waterproofed, and the seat cushion being formed so that the grooves are communicated to a bottom of the vehicle by penetrating the seat cushion in a downward direction at the joint part.
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Accused Products
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.
16 Citations
10 Claims
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1. 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:
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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;
whereinthe seat includes a seating part, a back rest part, and a joint part which connects the seating part and the back rest part, and the suppressing means includes the seat cushion of the seating part having an upper surface which defines a plurality of grooves arranged with predetermined intervals, the grooves being formed to extend in and to be sloped along a direction between a front end of the seating part and the joint part, the upper surface of the seat cushion including surfaces of the grooves being waterproofed, and the seat cushion being formed so that the grooves are communicated to a bottom of the vehicle by penetrating the seat cushion in a downward direction at the joint part. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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:
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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;
whereinthe suppressing means includes a water absorption layer which is disposed above the capacitive sensor and on a back side of a surface material of the seat, and holds water by absorption when water is poured on the seat.
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Specification