Headlight Pre-Adjustment for Oncoming Driver Recognition
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Solution Overview
Problem
Existing dynamic headlight control systems fail to effectively communicate adjustments to oncoming drivers, leading to continued dazzling or inappropriate responses, as the slow intensity changes are not recognized, and advanced lighting systems can trick the eye, causing drivers to maintain or re-activate high beams.
Innovation Solution
A pre-adjustment of the headlight assembly with a distinguishable change in brightness or beam distribution is implemented before switching to a low light characteristic, ensuring the oncoming driver recognizes the adjustment, with a fast intensity drop of at least 50% within 1 second to signal the change, and potentially including a preceding brightness increase followed by a drop, to clearly indicate the ego vehicle's reaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the headlight intensity is gradually reduced to avoid dazzling the oncoming driver, then the illumination is optimized for passing the oncoming vehicle, but the oncoming driver does not recognize the adjustment and may continue with high beam or respond inappropriately
Solution Approach 1:
The system performs a preliminary distinguishable brightness change (pre-adjustment) before the final intensity reduction. This pre-adjustment serves as a clear signal to the oncoming driver that the ego vehicle has detected them and is preparing to adjust headlights, enabling the oncoming driver to respond appropriately before the final low-light state is reached.
Solution Approach 2:
The headlight adjustment is divided into distinct phases: a preliminary phase with distinguishable brightness change, and a final phase with gradual intensity reduction. This periodic structure allows the oncoming driver to perceive and respond to the adjustment signal before the full effect is applied.
2Illumination intensity
If the headlight intensity is reduced slowly to maintain road illumination, then the road remains well-lit, but the transition is not perceptible to the oncoming driver
Solution Approach 1:
A preliminary fast brightness change is executed before the slow gradual reduction. This two-stage approach allows the transition to be both perceptible (fast initial change) and maintain adequate illumination (slow subsequent reduction), solving the contradiction between speed and illumination level.
Solution Approach 2:
The system dynamically adjusts the headlight intensity with varying rates: a fast initial adjustment phase for perceptibility, followed by a slow gradual reduction phase for maintaining illumination. This dynamic control strategy optimizes both the speed of transition and the illumination level at different stages.
3Loss of information
If a distinguishable pre-adjustment with fast intensity drop is implemented, then the oncoming driver recognizes the headlight adjustment, but the transition requires two-stage control increasing system complexity
Solution Approach 1:
The system implements a preliminary distinguishable brightness change as a standardized pre-adjustment phase. This clear signaling mechanism effectively communicates the headlight adjustment intention to the oncoming driver, reducing information loss and improving mutual understanding on the road.
Solution Approach 2:
The headlight adjustment process is segmented into distinct phases: preliminary distinguishable brightness change and final gradual intensity reduction. This segmentation allows each phase to serve its specific function clearly, with the pre-adjustment phase dedicated to communication and the final phase dedicated to illumination optimization.
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
A driver assistance system (10) for a motor vehicle comprises an adjustable headlight assembly (24) with adjustable light characteristics, an imaging system (11) adapted to capture images from a region in front of the motor vehicle, and a data processing device (14) adapted to detect an oncoming other motor vehicle by image processing of the images captured by the imaging system (11) and, if an oncoming vehicle is detected, to adjust said headlight assembly (24) to a low light characteristic I1 suited for passing the oncoming vehicle without dazzling the oncoming driver. The data processing device (14), if an oncoming vehicle is detected, is adapted to perform a pre-adjustment to said headlight assembly (24) before adjusting it to said low light characteristic I1, wherein said pre-adjustment comprises a distinguishable change of brightness of the light emitted by the headlight assembly (24) in the direction of the oncoming driver.