Headlight Control System Adaptive Luminance Change Rate
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Solution Overview
Problem
Existing headlight control systems cause driver distraction and imbalance in attention allocation due to sudden changes in luminance when re-irradiating cut-off regions, and current methods either compromise safety or increase driver load by adjusting luminance change rates.
Innovation Solution
A headlight control system that adjusts the luminance change rate based on the position of the cut-off region, utilizing human visual characteristics to ensure quick re-irradiation while minimizing driver load and attention imbalance, by varying the luminance change rate according to the Weber-Fechner law and specific regions within the visual field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cut-off region is immediately irradiated with light with the same luminance as other regions, then the viewability of the cut-off region is quickly secured, but the driver experiences glare and attention imbalance
Solution Approach 1:
The patent applies parameter changes by gradually increasing the luminance of the light source when re-irradiating the cut-off region, rather than immediately setting it to full brightness. This gradual change in the luminance parameter prevents sudden visual shocks to the driver while ensuring the cut-off region becomes visible. The control unit adjusts the luminance over time, balancing quick re-irradiation with driver comfort and safety.
2Object-affected harmful factors
If the change rate of luminance is made too small, then the driver load is suppressed, but the viewability of the cut-off region is not secured quickly
Solution Approach 1:
The patent applies dynamics by making the luminance change rate adaptive rather than fixed. The control unit dynamically adjusts the luminance increase speed based on the specific situation, allowing faster changes when safety is critical and slower changes when driver comfort is prioritized. This dynamic adjustment resolves the contradiction between quick re-irradiation and driver load suppression.
3Reliability
If the change rate of luminance is made too large, then the viewability of the cut-off region is quickly secured, but the driver experiences increased glare and attention imbalance
Solution Approach 1:
The patent applies parameter changes by carefully controlling the luminance increase rate to prevent attention imbalance. The control unit monitors and adjusts the luminance parameter to ensure it increases at a pace that the driver's visual system can adapt to without causing distraction or imbalance in attention allocation across different road regions.
Data Source
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Figure 3
Figure 4(a)~4(c)
AI summary
[Problem] At the time of re-irradiation of a cut-off region, both suppression of a load on a driver or an imbalance in an attention allocation and securing of safety by quick re-irradiation of the cut-off region are achieved. [Means for Solution] A headlight control system 100 has a headlight 20 including a plurality of LED light sources 23, a camera 11 and a radar 12 that detect a predetermined target object present ahead of a vehicle, and a controller 30 configured to control the headlight 20 such that, when the target object is present, of the plurality of LED light sources 23, the LED light source 23 irradiating a region where the target object is present is turned off, and such that, thereafter, when the target object is no longer present in the region, the turned-off LED light source 23 is turned on again. The controller 30 controls the headlight 20 such that, at the time of turning on the turned-off LED light source 23 again, a change rate of luminance of the LED light source 23 is changed according to a position of an irradiation region of the LED light source 23.