Auto leveling apparatus of vehicle headlamp

Abstract

An auto leveling apparatus which drives a motor only in case that a posture that has changed during stoppage becomes stable and the stable posture is different from the posture controlled at the last time thereby to reduce the number of operations of the motor. In an auto leveling apparatus of vehicle headlamp including a headlamp of which a light axis tilts up and down in relation to a car body by drive of a motor, a control unit for controlling the drive of the motor, a speed sensor for detecting speed, a pitch angle sensor for detecting pitch angle, and a memory for storing the pitch angle data detected by the pitch angle sensor, in which the control unit controls the drive of the motor, on the basis of the pitch angle data detected by the pitch angle sensor, so that the light axis of the headlamp has the constant inclination in relation to a road surface, the control unit controls the drive of the motor only in case that a posture (pitch angle data) that has changed once during stoppage becomes stable and the difference between its posture and a reference posture (reference pitch angle data) exceeds the predetermined value. Therefore, according to reduction of the number of operations of the motor, durability of the motor itself is improved.

Dependencies are inferred from the claim text.