Patent ID: 7219923

Claim:
A device for determining a kind of a load on a seat, comprising: a bio-signal analyzer receiving and analyzing a bio signal and a weight signal of the load on the seat detected by a bio-signal detector and a weight sensor, respectively, the bio-signal detector and the weight sensor being provided on the seat, wherein said bio-signal analyzer includes: a calculation means calculating a heat rate, a respiratory rate and a weight respectively of the load on the seat based on the bio signal obtained by the bio-signal detector and the weight signal obtained by the weight sensor; a comparative determine means to comparatively determine the kind of the load on the seat from the heart rate, the respiratory rate and the weight obtained by the calculations means, and to comparatively determine a size of a physique when the load on the seat is determined to be a human, and wherein said comparative determination means is provided with: a first determination step determining whether the load on the seat is a human or an object based on presence or absence of the respiratory rate, a second determination step determining, when the load on the seat is determined to be a human, the size of the physique by comparing the weight with a critical threshold value of a weight set previously; and a third determination step determining the size of the physique using at least the heart rate and the respiratory rate from the calculation means when the weight is determined to exceed the threshold value of the criterial weight in the second determination step.