Vehicular Headlamp Light Shielding for Curved-Road Visibility
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Solution Overview
Problem
Existing vehicular lighting systems can cause a decrease in visibility for drivers by shielding obstacles from light, leading to discomfort and reduced visibility, especially on curved roads.
Innovation Solution
A lighting control device and vehicular lamp system that includes a front vehicle detection system, obstacle detection, and a light-shielding area derivation mechanism to selectively shield obstacles while maintaining visibility by adjusting light distribution patterns based on detected vehicles and obstacles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If light-shielding control is performed to prevent glare to preceding vehicles, then comfort for other road users is improved, but visibility for the driver may decrease due to obstacles being shielded
Solution Approach 1:
The headlamp is divided into multiple independently controllable light-emitting units arranged in a matrix pattern, allowing selective shielding of specific regions. This segmentation enables the system to shield only the portions of light that would cause glare to preceding vehicles while maintaining illumination in other areas, thus preventing obstacle shielding and preserving driver visibility.
Solution Approach 2:
Different regions of the headlamp are controlled with different shielding characteristics based on their function. The matrix arrangement of light-emitting units allows each unit or small group of units to be independently controlled, applying light shielding locally where needed to prevent glare while leaving other regions unaffected to maintain driver visibility.
2Reliability
If light distribution is adjusted to maintain visibility on curved roads, then driver visibility is improved, but glare may be projected to preceding vehicles
Solution Approach 1:
The light distribution pattern is dynamically adjusted based on the detected positional relationship between the subject vehicle, preceding vehicles, and obstacles. The control unit modifies the light-shielding area in real-time, expanding or contracting it according to the curvature of the road and the position of preceding vehicles, thus maintaining driver visibility while preventing glare.
Solution Approach 2:
The system uses detection information about the positional relationship between the subject vehicle, preceding vehicles, and obstacles to dynamically adjust the light-shielding area. This feedback mechanism ensures that the shielding area is precisely controlled to cover only the regions that would cause glare to preceding vehicles, preventing both glare and obstacle shielding.
Data Source
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AI summary
There are provided a lighting control device (31), a vehicular lamp (10), and a lighting control method which can prevent visibility in front of a driver of a vehicle from decreasing. The lighting control device (31) controls a light distribution state by a vehicular headlamp (14L, 14R), and includes: an obstacle detection part (33) that detects an obstacle (WP) from an image in front of a subject vehicle taken by a camera; a light-shielding area deriving part (34) that derives a first light-shielding area (LSR, LNSR) of a left headlamp (14L) attached to a front left side of the vehicle (1), and a second light-shielding area (RSR, RNSR) of a right headlamp (14R) attached to a front right side of the vehicle according to a position of the obstacle (WP) when the obstacle detection part (33) detects the obstacle (WP); and a light distribution control part (35) that controls a light distribution state of the right headlamp (14R) and a light distribution state of the left headlamp (14L) according to the first light-shielding area (LSR, LNSR) and the second light-shielding area (RSR, RNSR) derived by the light-shielding area deriving part (34). The first light-shielding area (LSR, LNSR) and the second light-shielding area (RSR, RNSR) are different from each other.