| 摘要 |
<p>A passenger detecting device (2) includes a plurality of weight sensors (3a,3b,3c and 3d), a weight-fluctuation monitoring means and a passenger judging and data updating means. The weight sensors (3a,3b,3c and 3d) are arranged at different positions of a seat (4;4a) for respectively detecting weights acting on the seat (4;4a) of a motor vehicle. The weight-fluctuation monitoring means monitors weight-fluctuation amounts of the plurality of the weight sensors (3a,3b,3c and 3d) and sum-weight fluctuation amount. The passenger judging and data updating means judges a passenger on the seat (4;4a) to be a large physical-size person or a small physical-size person and updates information on the passenger on the seat (4;4a) when the sum-weight fluctuation amount (∆ Sum) is not less than each of the weight fluctuation amounts (∆Fi,∆Fo,∆Ri,Ro) and prevents the information to be updated when at least one of the weight fluctuation amounts is larger than the sum-weight fluctuation amount.
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