Automatic optical-axis adjusting device for automatically adjusting directions of optical axes of from lights

An automatic optical-axis adjusting device for automatically adjusting a direction of an optical axis of at least one front light of a vehicle, said automatic optical-axis adjusting device comprising:

• a control parameter computing means for computing a value of a control parameter, which is used for adjusting said direction of said optical axis of said at least one front light, based on output information of each one of a plurality of sensor arrangements;
• a sensor output judging means for determining whether each said value of said control parameter, which is derived from said output information of a corresponding one of said plurality of sensor arrangements, is normal, wherein:
• said sensor output judging means first determines whether a majority of said values fall within a predetermined allowable error range;
• and
• if said majority of said values fall within said predetermined allowable error range, said sensor output judging means determines said majority of said values as normal and the remaining of said values as abnormal;
• a control angle computing means for computing an optical axis control angle, which is used for adjusting said direction of said optical axis of said at least one front light, based on said output information of at least one said sensor arrangement, from which said normal value of said control parameter is derived;
• and
• an optical axis adjusting means for adjusting said direction of said optical axis of said at least one front light based on said optical axis control angle by driving an actuator that turns said optical axis of said at least one front light.