APPARATUS, METHOD AND PROGRAM FOR VEHICLE MASS ESTIMATION, AND APPARATUS, METHOD AND PROGRAM FOR DETECTING DECREASE IN TIRE AIR PRESSURE

摘要

A vehicle mass estimation apparatus includes a wheel rotation speed information detection device configured to detect rotation speed information regarding the respective wheels of the vehicle; a frequency characteristic estimation device configured to calculate wheel acceleration information based on the rotation speed information of the wheels to estimate a frequency characteristic of the wheel acceleration information; and a vehicle mass estimation device configured to estimate a vehicle mass based on the estimated frequency characteristic. The frequency characteristic estimation device calculates an integrated value of frequency gain magnitudes of the respective frequency domains of front wheels and rear wheels of the vehicle, and the vehicle mass estimation device estimates the vehicle mass based on the ratio among the respective integrated values of the front wheels and rear wheels and a relation calculated in advance between the ratio and the vehicle mass.