Apparatus and method of judging road surface conditions for...

Details Apparatus and method of judging road surface conditions for... Apparatus and method of judging road surface conditions for...

2005-06-21

2005-06-21

Oen, William (Department: 2855)

Measuring and testing

Tire, tread or roadway

Reexamination Certificate

active

06907778

ABSTRACT:
A road surface condition judging apparatus of a vehicle includes means for detecting wheel speeds of respective wheels, means for calculating a vehicle speed of the vehicle based on the wheel speeds, means for calculating a deceleration of the vehicle, slip ratio difference calculating means for calculating a difference of slip ratios between front wheels and rear wheels based on the wheel speeds of the respective wheels and the vehicle speed, tire judgment value establishing means for variably establishing a tire judgment value, tire type judging means for judging a tire type of the wheels based on the tire judgment value, grip threshold value establishing means for variably establishing a grip threshold value in accordance with the tire type and road surface judging means for judging a road surface condition based on a comparison of the difference of slip ratios with the grip threshold value.

REFERENCES:
patent: 4774667 (1988-09-01), Kuraoka et al.
patent: 9-188114 (1997-07-01), None
patent: 2003-237558 (2003-08-01), None

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