PURPOSE: To surely discriminate the human body and an object even when a vehicle vibration characteristic is changed.
CONSTITUTION: A device is constituted of a plurality of filters 3, 4 for wave filtering a certain specific frequency component in an output signal of a piezoelectric element 2 arranged in a seat 1 in a vehicle, frequency characteristic setting means 12 for setting frequency characteristic wave filtered by the filters 3, 4 based on a vibration characteristic of the vehicle and a decision means 9 for deciding a person for whether provided or not in the seat 1 based on an output signal respectively of the filters 3, 4, and when a signal is output from the piezoelectric element 2, a certain specific frequency component is wave filtered respectively by the filters 3, 4. Here based on the vibration characteristic of the vehicle, the frequency characteristic, wave filtered by the filters 3, 4, is set by the frequency characteristic setting means. In the decision means 9, based on a wave filter signal from the filter, the person is decided for whether provided or not in the seat.
WATANABE YOSHIAKI
SHIBA BUNICHI
MOROTA KANEI
HONDA MOTOR CO LTD
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