Patent Number: 6,401,020

Title: Process and device for controlling headlight range of a motor vehicle

Abstract: Device for control of headlight range of a motor vehicle including a front axle transmitter (1) and a rear axle transmitter (2), which generate signals depending on a position of a vehicle chassis relative to a front axle and a rear axle of the vehicle, wherein the device further includes adjustment devices (14, 15), which can adjust the headlight range of the motor vehicle depending on these signals. The device further includes a speed transmitter (3) and a terrain recognition unit (24), with the terrain recognition unit (24) being connected to the front axle transmitter (1), the rear axle transmitter (2), and the speed transmitter (3). The terrain recognition unit can calculate and store a difference between the signals from the front axle transmitter (1) and the rear axle transmitter (2), subtract a previously calculated difference in the signals, divide the signal obtained by this subtraction by a signal corresponding to the speed of the vehicle, and compare the signal obtained by this division with a predetermined threshold value. The terrain recognition unit (24) decides that a poor road surface is present when the threshold value is exceeded, and possibly deactivates control of the headlight range.

Inventors: Neumann; Andreas (Lippstadt, DE)

Assignee: Hella KG Hueck & Co.

International Classification: B60Q 1/04 (20060101); B60Q 1/115 (20060101); B60Q 001/08 ()

Expiration Date: 06/04/2019