Road surface condition determination apparatus

Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Indication or control of braking – acceleration – or deceleration

Reexamination Certificate

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Details

C701S073000, C701S079000, C340S444000, C073S009000

Reexamination Certificate

active

10921222

ABSTRACT:
A comparison/determination part7recieves the input of a front wheel speed filtered value ωfF from a front wheel speed filtered value calculation part5and a rear wheel speed filtered value ωrF from a rear wheel speed filtered value calculation part6. It is determined whether the front wheel speed filtered value ωfF has exceeded a preset first threshold C1. It is determined whether the rear wheel speed filtered value ωrF has exceeded a preset second threshold C2within a time for transmission of vibration from the front wheels to the rear wheels which is experimentally set in advance after the front wheel speed filtered value ωfF exceeded the first threshold C1. The road surface is then determined to be rough when it is determined that the rear wheel speed filtered value ωrF has exceeded the preset second threshold C2.

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European Search Report, dated Dec. 10, 2004.

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