Road surface discriminator and apparatus applying same

Details Road surface discriminator and apparatus applying same Road surface discriminator and apparatus applying same

G - Physics

08

B

G08B 19/02 (2006.01) B60T 8/172 (2006.01) B60T 8/72 (2006.01) G01B 11/30 (2006.01) G01P 3/36 (2006.01) G01W 1/00 (2006.01)

Patent

CA 2166323

Light is projected upon a road surface (LD) from a light source (11) for illuminating the road surface. Diffuse reflected light from the road surface (LD) is received by light sensors (31A, 31B) through a spatial filter, and the resulting light-reception signals are applied to a differential amplifier circuit (51). A center-frequency component corresponding to the spatial frequency of the spatial filter is extracted by a tracking band-pass filter (52), and the intensity (Da) thereof is detected by an amplitude detector circuit (54). Low-frequency component intensity (Db) corresponding to a spatial frequency lower than the spatial frequency of the spatial filter is detected by a tracking low-pass filter (55) and an amplitude detector circuit (56). The condition of the road surface is judged to be snow, gravel or asphalt in a discriminating circuit (60) based upon the center-frequency component intensity (Da) and the low-frequency component intensity (Db).

Une source lumineuse (11) éclaire un revêtement routier (LD), la lumière réfléchie et diffusée par le revêtement routier (LD) est captée par des photodétecteurs (31A et 31B) par l'intermédiaire d'un filtre spatial, et les signaux de captage de lumière sont envoyés à un circuit amplificateur différentiel (51). Un filtre passe-bande à poursuite en fréquence (52) extrait la composante de fréquence centrale correspondant à la fréquence spatiale d'un filtre spatial, et un circuit mesureur d'amplitude (54) mesure l'intensité (Da) de la composante. Un filtre passe-bas à poursuite en fréquence (55) et un circuit mesureur d'amplitude (56) mesurent les intensités (Db) des composantes basse fréquence correspondant aux fréquences spatiales inférieures à celle du filtre spatial. Un circuit de contrôle (60) détermine si le revêtement routier (LD) est couvert de neige, de gravillons ou d'asphalte.

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