Autoleveling device of headlamp for automobile

Abstract

An autoleveling device comprises a pair of left and right headlamps in which optical axes L are tilted in a vertical direction with respect to a body by driving operations of respective motors ( L, R), single control means for controlling the driving operations of the left and right motors at the same time, a vehicle speed sensor a height sensor and a storage section for storing pitch angle data detected by the height sensor the control means controlling the respective motors such that the respective optical axes L have a predetermined inclination with respect to a road based on the pitch angle data thus detected, wherein the motors are driven only if a difference between the detected pitch angle and the pitch angle used for the last driving control of the motor is equal to or more than a predetermined reference value which is more than a pitch angle equivalent to a hysteresis width of each of the left and right motor driving circuits (|&thgr; ). Consequently, there is no drawback that only one of the motors is driven, and both motors are always driven at the same time. Therefore, the optical axes of the left and right headlamps are always held in the same positions in a vertical direction so that a constant visibility can be guaranteed.