Patent ID: 6193398
Filing Date: 2001-02-27
Classification: B60Q

Abstract:
A system for automatically adjusting optical axis direction of a headlight of a vehicle, comprising:a vehicle height sensor for sensing a displacement in a height of a vehicle;inclination angle calculating means for calculating an inclination angle of each of the optical axis direction of a headlight of the vehicle to the horizontal plane, on the basis of an output value of the vehicle height sensor;a vehicle speed sensor for sensing the speed of the vehicle;mode determining means for determining a control mode corresponding to a driving state from the vehicle speed and an acceleration calculated based on the vehicle speed;filter switching means for switching a filter which changes response of adjustment in the optical axis direction of the headlight in accordance with the control mode determined by the mode determining means; andoptical axis direction adjusting means for adjusting the optical axis direction of the headlight on the basis of an angle obtained by performing filtering switched by the filter switching means to the inclination angle calculated by the inclination angle calculating means, wherein the mode determining means has a plurality of determination levels for determining a transition to an acceleration/deceleration state of the vehicle and, when the acceleration exceeds the determination level which is the highest among the plurality of determination levels and is set so as not to be reached in a normal driving state, continues a control mode corresponding to the acceleration/deceleration state of the vehicle unless a constant speed state of the vehicle continues for a predetermined period.