Road surface condition detector for automotive vehicle

Details Road surface condition detector for automotive vehicle Road surface condition detector for automotive vehicle

1994-02-24

1996-05-28

Swann, Glen

Communications: electrical

External condition vehicle-mounted indicator or alarm

340905, 340602, 340904, 180167, 367 87, G08G 100

Patent

active

055215947

ABSTRACT:
A road surface condition detector for detecting a dry/wet condition of a road surface includes an ultrasonic wave receiver 2 for picking up the ultrasonic noise generated by a road wheel tire 1, which increases conspicuously when the R is wet. The output of the ultrasonic wave receiver 2 is amplified by a amplifier 21, and the absolute level thereof is detected by an absolute level detector 22, and the absolute level is smoothed by a received-wave intensity detector 20. The smoothed signal is compared with a reference voltage Vt to determine the road surface condition. Preferably, the reference voltage Vt is varied in accordance with the vehicle speed. When the automotive vehicle is provided with ultrasonic wave transmitter/receiver units 3a and 3b, the ultrasonic noise component is extracted from the received signal by an ultrasonic noise intensity detector circuit 40, and the extracted component is compared with a reference voltage level to determine the road surface condition.

REFERENCES:
patent: 4274091 (1981-06-01), Decker
patent: 4492952 (1985-01-01), Miller
patent: 5159837 (1992-11-01), Wada
patent: 5315295 (1994-05-01), Fujii
patent: 5350035 (1994-09-01), Bodier et al.
patent: 5362139 (1994-11-01), Watanabe

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