Patent ID: 7248996

Claim:
A vehicle driver's fatigue evaluating method for quantitatively calculating a degree of fatigue of a driver seated on a seat by using an operational expression determined by a statistical technique based on load measurements comprising an amount of rearward deflection of a lower part of a backrest portion of the seat, a load applied downward to a front part of a seating portion of the seat, and a load applied rearward to an upper part of the backrest portion, in a state of the driver being seated on the seat, wherein said operational expression is obtained by a multiple regression analysis with the amount of rearward deflection of the lower part of the backrest portion, the load applied downward to the front part of the seating portion and the load applied rearward to the upper part of the backrest portion regarded as explanatory variables, and an actual degree of fatigue measured of the driver seated on the seat as a response variable, and storing load measurements and a degree of fatigue of a driver in a data file.