Patent ID: 7053762

Claim:
A projecting direction control system for a vehicle headlamp comprising: a vehicle-posture detecting means for detecting variation in the posture in the traveling direction of a vehicle; a light projection control means for controlling the direction of optical axis of light projected from a vehicle headlamp in response to variation in the vehicle posture; a wheel-speed detecting means for detecting left and right wheel speeds, and a posture decision means for calculating centrifugal force from the left and right wheel speeds obtained by the wheel-speed detecting means, difference between the wheel speeds, and characteristic information of the vehicle including vehicle width and vehicle weight, so as to recognize a rolling condition, wherein the posture decision means calculates the centrifugal force while the vehicle is turning by obtaining the product of the left wheel speed or right wheel speed and the difference between the left and right wheel speeds and multiplying the product by the ratio of vehicle weight to vehicle width.