Headlight Light Distribution Control Device for Urban Driving
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Solution Overview
Problem
Conventional headlight light distribution control systems frequently switch the irradiation direction based on the presence of oncoming vehicles or streetlights, leading to driver discomfort, especially in urban areas where multiple light sources are detected successively.
Innovation Solution
A headlight light distribution control device that includes a light source detector and a control device to count the frequency of light source appearances and maintain the headlight at low beam for a predetermined time when the appearance frequency exceeds a threshold, reducing frequent switching and minimizing driver discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the irradiation direction of the headlight is switched based on the presence of light sources (oncoming vehicles, streetlights), then the safety and appropriateness of headlight usage is improved, but the frequency of switching increases causing driver discomfort
Solution Approach 1:
The control device performs preliminary actions by detecting light sources and accumulating their appearance frequency before actually switching the headlight beam. This preliminary detection and counting phase allows the system to anticipate frequent switching scenarios and prepare appropriate responses, thereby improving reliability while preventing excessive switching that would cause driver discomfort
Solution Approach 2:
The system implements feedback by continuously monitoring the appearance frequency of light sources and using this information to modulate the headlight switching behavior. When the feedback shows high frequency of light source appearance (indicating urban areas or heavy traffic), the system adjusts its switching behavior to maintain low beam longer, thus balancing safety requirements with driver comfort
2Object-affected harmful factors
If the headlight switches frequently to avoid dazzling oncoming vehicles in urban areas, then the safety for other road users is improved, but the driver experiences discomfort due to frequent switching
Solution Approach 1:
The system changes the parameter of beam switching frequency based on the detected light source appearance frequency. In urban environments with high light source density, the system modifies the switching parameter to maintain low beam for extended periods, thereby reducing dazzling effects on other road users while preventing excessive switching that would discomfort the driver
3Object-affected harmful factors
If the headlight remains at low beam for extended periods to prevent dazzling, then the safety for other road users is improved, but the visibility for the driver's own lane decreases
Solution Approach 1:
The headlight beam position is made dynamic rather than static, allowing the system to switch between low beam and high beam based on real-time detection of light sources and accumulated frequency data. This dynamic adjustment ensures that the beam is lowered only when and where necessary to prevent dazzling, while maintaining high beam for optimal visibility during appropriate conditions
Data Source
AI summary
Speed of a vehicle is acquired from a speed detecting device, and then a beam switching threshold, according to the acquired speed, of an irradiation direction of a headlight is initially set. When the number of appearance (i.e. frequency of appearance) of a light source in a predetermined time detected by a light source detection means have become the beam switching threshold or more, the headlight is switched to a low beam. When a predetermined time (beam switching prohibition time Tp) has been passed after the irradiation direction of a headlight was switched to the low beam, the irradiation direction of the headlight is switched to a high beam.