| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a technology improving the accuracy of optical axis control of a headlight by reducing a detection error of a vehicle height sensor. <P>SOLUTION: A storage ROM 24 stores actually measured data at different two points of actually measured data (H<SB>a</SB>, V<SB>a</SB>) of detection signal voltage V<SB>a</SB>of the vehicle height sensor at a certain vehicle height H<SB>a</SB>, and actually measured data (H<SB>b</SB>, V<SB>b</SB>) of detection signal voltage V<SB>b</SB>of the vehicle height sensor at vehicle height H<SB>b</SB>different from the vehicle height H<SB>a</SB>while the vehicle height sensor 11 is mounted on a vehicle. A CPU21 calculates the vehicle height by a characteristic approximation: H=(V-V<SB>a</SB>)&times;(H<SB>b</SB>-H<SB>a</SB>)/(V<SB>b</SB>-V<SB>a</SB>) indicating a relative relationship between the detection signal voltage V and the vehicle height H, on the basis of each of the actually measured data stored in the storage ROM 24 storing means. An pitch angle of the vehicle is calculated on the basis of the calculated vehicle height. On the basis of the calculated pitch angle, control amount to a motor 35 for adjusting an optical axis direction of the headlight 30 is decided, and the optical axis direction is adjusted. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT</p> |
