Vehicle Headlight Pattern Lighting for Pedestrian Visibility in Turns
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Solution Overview
Problem
Existing vehicle headlight systems fail to adequately prevent pedestrian overlooking, especially under adverse conditions like nighttime and rain, as they do not effectively enhance driver visibility of pedestrians when changing course.
Innovation Solution
The vehicle headlight device incorporates pattern photoirradiators that alternate bright and dark regions in their light distribution and cornering lights that illuminate the entire area below, ensuring improved visibility by synchronizing their operation with cornering lights to highlight the presence of pedestrians when the vehicle is turning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the optical axis direction is adjusted based on steering angle and vehicle speed, then visibility in the vicinity of pedestrian crossing is improved, but pedestrian recognition under adverse conditions (nighttime and rain) is insufficient
Solution Approach 1:
The headlight device segments the illumination function into multiple independent light sources: pattern photoirradiators that create alternating bright and dark regions, and cornering lights that provide full-area illumination. This segmentation allows each component to perform its specific function optimally, with pattern photoirradiators creating visual contrast and cornering lights ensuring comprehensive coverage under adverse conditions.
Solution Approach 2:
Different regions of the road are illuminated with different light distribution patterns tailored to their specific requirements. The pattern photoirradiators create alternating bright and dark regions in specific areas to enhance pedestrian detection, while cornering lights provide uniform illumination in other areas. This local quality approach ensures that each region receives the appropriate type of illumination for its function.
2Device complexity
If a single light distribution pattern is used, then the device complexity is low, but pedestrian detection capability under adverse conditions is insufficient
Solution Approach 1:
The headlight device dynamically switches between different illumination patterns based on driving conditions. The control unit activates pattern photoirradiators and cornering lights in specific sequences and combinations depending on whether the vehicle is turning, the road gradient, and environmental conditions. This dynamic adaptation allows the system to optimize pedestrian detection capability without requiring multiple fixed physical configurations.
Solution Approach 2:
The pattern photoirradiators create periodic alternating bright and dark regions in the light distribution pattern. This periodic action enhances the visibility of pedestrians by creating visual contrast that makes moving objects more detectable. The cornering lights operate in coordination with this periodic pattern to provide sustained illumination while maintaining the enhanced detection capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration significantly enhances pedestrian visibility for the driver, even under adverse conditions, by utilizing the visual properties of humans to quickly recognize moving shapes, thereby reducing the likelihood of overlooking pedestrians during turns.
Implementation Method 1
a pattern photoirradiator which emits light on a predetermined irradiation pattern light distribution region in an irradiation pattern in which a bright region and a dark region are alternately repeated
Implementation Method 2
a cornering light which emits light on a light distribution region below the irradiation pattern light distribution region in a form in which an entire area is a bright region
Data Source
AI summary
Provided is a vehicle headlight device which can improve overlooking of pedestrians by a drive, even under adverse conditions such as nighttime or rain at night. A vehicle headlight device includes: a pattern photoirradiator (right-side pattern irradiation lamp) which irradiates light on a predetermined irradiation pattern light distribution region of a vehicle in an irradiation pattern in which a bright region and a dark region are alternately repeated; and a cornering light which irradiates a light distribution region under the irradiation pattern light distribution region in a form in which an entire area is a bright region. In this embodiment, the pattern photoirradiator irradiates light synchronously with the cornering light.