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 for estimating a vehicle mass based on rotation speed information of wheels attached to a vehicle. The apparatus includes a wheel rotation speed information detection means for detecting rotation speed information regarding the respective wheels of the vehicle; a frequency characteristic estimation means for calculating 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 means for estimating a vehicle mass based on the estimated frequency characteristic. The frequency characteristic estimation means 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 means 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.