Road surface condition sensor for controlling brakes

Details Road surface condition sensor for controlling brakes Road surface condition sensor for controlling brakes

1993-06-23

1994-10-18

Williams, Hezron E.

Measuring and testing

Surface and cutting edge testing

Roughness

731181, 36442602X, G01B 528

Patent

active

053557174

ABSTRACT:
A road surface condition sensor for judging if there is an appreciable unevenness on a road surface to provide a desirable braking performance for a vehicle, which comprises a vehicle speed estimating circuit for estimating the running speed of the vehicle, a steering angle sensor for detecting a steering angle of the vehicle, and a judging circuit for making a judgement as to whether the magnitude of a time-derivative of the steering angle indicative of the unevenness of a road surface is greater than a threshold value which is determined according to the estimated running speed of the vehicle, and for outputting a road surface condition signal representing results of the judgement.

REFERENCES:
patent: 5222570 (1993-06-01), Kawamura et al.

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