Road-surface condition estimating device

Details Road-surface condition estimating device Road-surface condition estimating device

2008-06-24

2009-11-17

Le, John H (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Mechanical measurement system

C701S070000, C702S141000

Reexamination Certificate

active

07620504

ABSTRACT:
A driving-torque difference value, an inertial-force difference value of the vehicle, and an inertial-force change-amount difference value of the vehicle are calculated. Subsequently, a first determination coefficient by which the inertial-force difference value is to be multiplied or a second determination coefficient by which the driving-torque difference value is to be multiplied is estimated on the basis of a state equation having the inertial-force difference value as a state variable and the driving-torque difference value as an input variable. Subsequently, a road-surface condition is determined on the basis of a comparison between a threshold value and the first determination coefficient or the second determination coefficient.

REFERENCES:
patent: 5960376 (1999-09-01), Yamakado et al.
patent: 6904349 (2005-06-01), Mori
patent: 7206702 (2007-04-01), Isono et al.
patent: 6-323171 (1994-11-01), None
patent: 2006-23287 (2006-01-01), None

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