Predictive Headlamp Beam Shaping for Moving-Object Glare Avoidance
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Solution Overview
Problem
Existing motor vehicle lighting systems face challenges in preventing glare to moving target objects due to latency in processing and generating glare-free beams, especially when the target is moving at high speeds or around bends of high curvature.
Innovation Solution
A method that involves acquiring the target object's position using a sensor system, predicting its future position, correcting the acquired position based on this prediction, and generating a glare-free beam region in the lighting device accordingly, allowing the beam to be adjusted in real-time to compensate for processing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the lighting system uses real-time sensor data to generate the glare-free beam region, then the beam accurately illuminates the road without causing glare, but when the target object moves at high speed, the processing latency causes the beam region to be offset from the actual target position
Solution Approach 1:
The system performs preliminary action by predicting the future position of the target object based on its current motion state (velocity and acceleration) before the beam is actually emitted. This prediction allows the glare-free region to be pre-positioned at where the target will be, rather than where it currently is, compensating for the inherent processing and emission latency of the lighting system.
Solution Approach 2:
The system implements feedback by continuously tracking the target object's position and motion parameters, using this information to dynamically adjust and update the predicted position. The feedback loop ensures that the prediction remains accurate even as the target's motion state changes, maintaining precision despite the time delay between detection and beam emission.
2Productivity
If the lighting device emits a focused beam to illuminate specific road areas, then road illumination is optimized, but the system complexity increases due to the need for real-time position prediction and correction
Solution Approach 1:
The control unit is designed to perform multiple functions: it processes sensor data, calculates target position, predicts future position based on motion parameters, and controls the pixelated beam emission. By consolidating these functions into a single multi-functional control unit, the system achieves the required complexity while maintaining efficient road illumination through integrated processing.
Data Source
AI summary
A method for controlling a lighting device of a host motor vehicle in order to emit a beam for lighting the road that is non-dazzling to a target object on this road. The method includes acquiring, with a sensor system of the host motor vehicle, the position (xtarget_t0, ytarget_t0) of the target object on the road at a given time (t0), and predicting, with a predicting unit, the position (xtarget_t1, ytarget_t1) of the target object on the road at a time (t1) that is in the future with respect to the given time. Also included is correcting, with the predicting unit, the acquired position of the target object at a given time depending on the predicted position at the future time, and generating, with the lighting device, a non-dazzling zone (Z) in a beam for lighting the road, which beam the device emits depending on the corrected position (PG,PD) of the target object.