Apparatus and method for controlling light distribution of headlamp

An apparatus for controlling the light distribution of a headlamp in which light performance is changeable, comprising:

• a speed sensor for detecting a speed of a vehicle;
• a turn signal switch for indicating a moving direction of said vehicle;
• calculating means for maintaining and accommodating illumination level of driver's view field including driver's view position in accordance with route of the forward roadway of said vehicle, vehicle speed a direction of said vehicle indicated by said turn signal switch;
• and
• control means for controlling the light distribution composed of beam spread and beam orientation of said headlamp on the basis of a result of calculation by said calculating means.

A method for controlling a light distribution of a headlamp in which light performance is changeable comprising the steps of:

• detecting a speed of a vehicle;
• estimating a driver's view position determined by a distance said vehicle reaches after a predetermined time along a forward roadway and a deviation angle formed by a running direction of said vehicle and a direction of said driver's view position;
• calculating a light distribution of said headlamp for maintaining and accommodating illumination level of driver's view field including the driver's view position;
• and
• controlling the light distribution composed of beam spread and beam direction of said headlamp on the basis of a result of calculation.

A method for controlling a light distribution of a headlamp in which light performance is changeable, comprising the steps of:

• assigning operating condition of a vehicle and a deviation angle between a running direction of the vehicle and a direction of a view position of driver on a scale respectively in advance in accordance with predetermined first principles while establishing degrees thereof;
• identifying a position on the scale to determine the degree and carrying out a predetermined calculation with respect to the degree to produce a calculation result;
• at least one of selecting and averaging the calculation result in accordance with predetermined second principles to determine a control value;
• and
• controlling the light distribution on the basis of the control value.