System for automatically adjusting optical axis direction of vehicle headlight

A system for automatically adjusting optical axis direction of a headlight of a vehicle, comprising:

• a single vehicle height sensor which is disposed in one of a front side and a rear side of a vehicle and senses a displacement in height of the vehicle;
• inclination angle calculating means for calculating an inclination angle in the optical axis direction of a headlight of the vehicle to the horizontal plane by using a prediction expression which is divided into a plurality of regions of vehicle postures having different inclinations in accordance with loading conditions, on the basis of an output of the vehicle height sensor;
• and
• optical axis direction adjusting means for adjusting the optical axis direction of the headlight on the basis of the inclination angle calculated by the inclination angle calculating means.

A system for automatically adjusting optical axis direction of a headlight of a vehicle, comprising:

• a single vehicle height sensor which is disposed in one of a front side and a rear side of a vehicle and senses a displacement in height of the vehicle;
• storing means for preliminarily storing, as system error information, an error which occurs in association with installation of the vehicle height sensor and various errors caused by other factors of the vehicle;
• inclination angle calculating means for calculating an inclination angle in the optical axis direction of a headlight of the vehicle to a horizontal plane by using a prediction expression which is divided into a plurality of regions of vehicle postures having different inclinations in accordance with loading conditions, on the basis of an output of the vehicle height sensor and the system error information stored in the storing means;
• and
• optical axis direction adjusting means for adjusting the optical axis direction of the headlight on the basis of the inclination angle calculated by the inclination angle calculating means.

A system for automatically adjusting optical axis direction of a headlight of a vehicle, comprising:

• inclination angle calculating means for calculating an inclination angle in the optical axis direction of a headlight of a vehicle to the horizontal plane on the basis of an output of a single vehicle height sensor which is disposed in either a front part or a rear part of the vehicle and senses a displacement of height of the vehicle;
• driving mode determining means for determining a driving mode of the vehicle;
• reference angle updating means for updating a reference inclination angle in a stop mode of the vehicle on the basis of an output of the vehicle height sensor each time it is determined by the driving mode determining means that the vehicle is in a stable driving mode;
• and
• optical axis direction adjusting means for correcting the inclination angle calculated by the inclination angle calculating means on the basis of the reference angle by the reference angle updating means and adjusting the optical axis direction of the headlight.

A system for automatically adjusting optical axis direction of a headlight of a vehicle, comprising:

• inclination angle calculating means for calculating an inclination angle in optical axis direction of a headlight of a vehicle to the horizontal plane on the basis of an output of a single vehicle height sensor which is disposed in either a front part or a rear part of the vehicle and senses a displacement of the height of the vehicle;
• turning state determining means for determining a turning state of the vehicle;
• and
• optical axis direction adjusting means for correcting the inclination angle calculated by the inclination angle calculating means on the basis of a determination result of a turning state of the vehicle by the turning state determining means and adjusting the optical axis direction of the headlight.