Vehicle headlamp apparatus

Details Vehicle headlamp apparatus Vehicle headlamp apparatus

2005-07-19

2005-07-19

O'Shea, Sandra (Department: 2875)

Illumination

Supported by vehicle structure

Condition responsive

C362S513000, C362S526000

Reexamination Certificate

active

06918688

ABSTRACT:
A vehicle headlamp device contains a rotation-state recognizing circuit operating such that when any of Hall elements used for controlling a rotational position of a drive motor for deflecting the optical axes in a headlamp device is abnormal, a rotation-state recognizing circuit recognizes a rotational position of the drive motor based on the output signals of the remaining Hall elements and a predetermined angle prediction time computed using a rotational period of the drive motor. With provision of the rotation-state recognizing circuit, even when any of the Hall elements becomes defective, the rotation of the drive motor is normally controlled to thereby secure a proper optical-axis deflection control in the headlamp device.

REFERENCES:
patent: 2002/0064051 (2002-05-01), Sugimoto et al.
patent: 2002-160581 (2002-06-01), None

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