US Patent No. 9,114,754

METHOD FOR REGULATING THE BEAM RANGE OF AT LEAST ONE HEADLAMP OF A VEHICLE AND LIGHT CONTROL DEVICE


Patent No. 9,114,754
Issue Date August 25, 2015
Title Method For Regulating The Beam Range Of At Least One Headlamp Of A Vehicle And Light Control Device
Inventorship Tobias Ehlgen, Ravensburg (DE)
Stefan Nordbruch, Kornwestheim (DE)
Johannes Foltin, Ditzingen (DE)
Assignee ROBERT BOSCH GMBH, Stuttgart (DE)

Claim of US Patent No. 9,114,754

1. A method for beam range regulation of at least one headlamp of a vehicle, comprising:
reading in a camera image of at least one camera of the vehicle, wherein the camera image includes at least a part of a representation
of a projection surface of a light cone of the headlamp in front of the vehicle;

determining at least one coordinate of at least one of (i) predefined brightness transition in the camera image, and (ii)
a predefined brightness inhomogeneity in the camera image, and additionally determining an unevenness contour of the surface
of a roadway by determining a height contour of the roadway surface over a predefined distance by traveling the roadway with
the vehicle over the predefined distance;

comparing the determined coordinate to a target coordinate to obtain a difference between the determined coordinate and the
target coordinate, wherein the target coordinate represents a coordinate at which the at least one of the predefined brightness
transition and the predefined brightness inhomogeneity is expected, and wherein the target coordinate is adapted corresponding
to the unevenness contour of the roadway surface for a repeated pitching motion of the vehicle caused by the unevenness contour
of the roadway surface; and

controlling the headlamp with a beam range modification signal to modify the beam range, wherein the beam range modification
signal is a function of the difference between the determined coordinate and the target coordinate.