NUM FICHE 005

068

CODE DOC 025

REDACTEUR 030

SIMAL Isabelle

ORGANISME 035

ISTI

DATE RED 040

9205

ILL 050

*

DOM GEN 060

électronique|industrie automobile|

DOM SPEC 065

équipement électronique|suspension du véhicule automobile|

ENT AN 105

optical speed-over-ground sensor

IN ENT AN 110

E; a

DEF AN 115

Optical sensor that sends a light beam on the road surface which is projected back onto multiple photodetectors at a frequency proportional to the speed at which the ground passes beneath the vehicle. (R)|a|

CONT AN 120

Over the past two years Lucas has also been developing a promising optical speed- over-ground (SOG) sensor, prototypes of which have been successfully tested in a wide range of climatic conditions. It is based on direct measurement from the ground passing beneath the vehicle and has a number of potential applications, among them racing-car dynamic control, the most sophisticated brake management systems and certain mobile agricultural equipement. The SOG sensor operates via an advanced form of electronic filtration. The image of the road surface is projected into multiple photo-detectors configured as a spatial filter and, as the vehicle travels over that surface, the movement of the light pattern falling on the detectors varies at a frequency proportional to the speed: extract that frequency and you have a measure of the true ground speed. Variations of vehicle ride height do not affect the accuracy and the system can be modified to measure two velocity vectors, enabling sideslip rate to be measured as well as forward or backward speed. |a|

NOTE AN 125

This speed-over-ground sensor operates via an advanced form of electronic filtration. |a| Another approach to speed ground measurement is based upon Doppler radar principles. |b|

ENT ADD AN 135

1- speed over ground sensor |E; b|

AB AN 140

1- SOG sensor |E; a|

ENT FR 205

capteur de vitesse sur route

IN ENT FR 210

n m; F; (R)

DEF FR 215

Capteur optique qui envoie un faisceau de lumière sur la surface de la route qui est réfléchi sur de multiples photodétecteurs à une fréquence proportionnelle à la vitesse à laquelle défile la route sous le véhicule. (T)(R)

CONT FR 220

SOURCES 295

SOURCE ANNEE VOLUME NUMERO MOIS PAGE MENTION

a DEAN-F 1991 343

b CIST-E 1991 29

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© Isabelle Simal, 1993.