Vehicle Headlamp Glare Reduction Using Angle-Based Object Detection
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Solution Overview
Problem
Existing methods for controlling motor vehicle headlamps to reduce glare effects are inadequate due to incorrect determination of the glare reduction range, often caused by imprecise calculation of the total distance between the vehicle and objects, leading to potential driver distraction.
Innovation Solution
The method determines the glare reduction range using the angle between the vehicle's longitudinal axis and the object, with a correction value added to this angle to define the outer edge of the glare reduction area, independent of the total distance, thereby ensuring consistent and effective glare reduction without relying on precise distance calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the total distance between the object and the motor vehicle is used for determining the glare reduction range, then the illumination can be precisely adjusted to the object, but the distance determination is not exact enough leading to incorrect glare reduction range
Solution Approach 1:
The patent extracts the distance parameter from the glare reduction range determination process. Instead of using total distance between object and vehicle, the method only uses the angle between the longitudinal axis and the object, eliminating the unreliable distance measurement from the calculation while maintaining effective glare reduction.
Solution Approach 2:
The patent changes the determination parameter from total distance to angle measurement. By using angular position relative to the longitudinal axis instead of linear distance, the system achieves reliable glare reduction range determination without depending on imprecise distance calculations.
2Device complexity
If the glare reduction range is determined using angle only without correction value, then the calculation is simpler, but the parallax effects cause incorrect range determination especially at larger angles
Solution Approach 1:
The patent applies a correction value to the angle measurement before using it for glare reduction range determination. This preliminary correction compensates for parallax effects that become significant at larger angles, ensuring accurate range determination while keeping the overall calculation process relatively simple.
3Reliability
If the glare reduction range is made wider and higher to ensure objects are encompassed, then all objects are illuminated with reduced brightness, but more area is illuminated than necessary especially for distant objects
Solution Approach 1:
The patent determines the glare reduction range based on the specific angular position of each detected object rather than using a fixed wide range. This allows the illumination reduction to be locally adapted to each object's position, ensuring all objects are encompassed while minimizing the total area illuminated with reduced brightness.
Data Source
AI summary
A method is provided for controlling a headlamp of a motor vehicle. An object is detected by an object detecting device of the motor vehicle. An angle is determined between a geometrical longitudinal axis of the motor vehicle passing through the object detecting device and a geometrical connecting line between the object detecting device and the object. A glare reduction range of the headlamp is determined using the angle without taking into account a total distance between the object and the motor vehicle, the headlamp illuminating the glare reduction range with a lower brightness than areas adjacent to the glare reduction range.