Method of estimating a height of water in contact with a...

Details Method of estimating a height of water in contact with a... Method of estimating a height of water in contact with a...

2008-04-03

2010-06-22

Caputo, Lisa M (Department: 2855)

Measuring and testing

Tire, tread or roadway

C152S209180

Reexamination Certificate

active

07739905

ABSTRACT:
A method of estimating the height of water (hw) that is present on a wet ground of a road and that is in contact with a tread of a tire of a vehicle travelling on this wet road utilizes one or more sensors in the tread of the tire. Each of the one or more sensors is capable of measuring a characteristic quantity of stresses that the tread experiences locally when the tire is rolling on the ground. A signal corresponding to these measurements is produced, and a portion of this signal relating to a passing of the one or more sensors into an apparent area of contact between the tire and the ground is extracted. An instantaneous value (ΔL), relating to a length of an indirect contact region of the apparent area of contact between the tread of the tire and the ground, is determined from this information, and a water height (hw) is estimated from a calculation that takes into account the determined instantaneous value.

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