Vehicle Light Distribution Control for Stable ADB Pattern Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional ADB control primarily focuses on vehicles in front, leading to visual annoyance due to frequent changes in light distribution patterns when additional objects like road signs and pedestrians are considered, which can cause glare and decrease viewability.
Innovation Solution
A light distribution control device that classifies objects in front of a vehicle into vehicles, short-range, and long-range objects, adjusting light intensity based on object type and brightness to reduce glare and enhance visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a projector type headlight and reflector type headlight are combined in one headlight assembly, then the headlight can switch between different light distribution patterns, but the structure becomes complex and control difficulty increases
Solution Approach 1:
The headlight assembly is divided into separate functional modules: a projector unit and a reflector unit, each with its own light source and optical system. This segmentation allows independent control and simplifies the overall complexity by making each module manageable while maintaining versatility through their combination.
Solution Approach 2:
The headlight system employs dynamic control where the projector and reflector can be independently activated or deactivated based on driving conditions. The control unit dynamically switches between different light distribution patterns (pencil beam, flood beam, hybrid) by controlling which module operates, providing adaptability without requiring permanent complex structures for all possible functions.
2Adaptability or versatility
If the projector and reflector are controlled independently, then various light distribution patterns can be achieved, but the control system becomes complicated
Solution Approach 1:
The control unit is designed with multi-functionality to handle various control modes (pencil beam mode, flood beam mode, hybrid mode) through a single integrated controller. This universal control approach simplifies the system by using one control unit that can adapt to different operating conditions rather than requiring separate control circuits for each light distribution pattern.
Solution Approach 2:
The control system manages complexity by changing operational parameters (which light source activates, which module operates) rather than requiring complex structural changes. The control unit adjusts the operational state of the projector and reflector based on detected driving conditions, achieving versatile light distribution through parameter adjustment rather than complex control logic.
3Illumination intensity
If the light source is positioned at the focal point of the parabolic mirror, then parallel light beams are generated, but the headlight structure becomes constrained
Solution Approach 1:
The optical system is segmented into two independent pathways: the reflector unit with its parabolic mirror and light source positioned at the focal point for generating parallel beams, and the projector unit with its own optical system. This segmentation allows the reflector to maintain optimal optical geometry for parallel beam generation without constraining the overall headlight structure, as the projector unit provides additional design flexibility.
Solution Approach 2:
The control unit acts as an intermediary that manages the operation of both the reflector and projector based on driving conditions. This intermediary control allows the system to maintain the constrained optimal positioning of the light source at the parabolic mirror's focal point while still achieving structural flexibility through selective activation of different modules.
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
Reduces visual annoyance and improves viewability by selectively controlling light distribution to prioritize important objects, minimizing frequent pattern changes.
Implementation Method 1
a light source (S) and a parabolic mirror (M) having the light source at a focal point thereof are provided in a headlight assembly
Implementation Method 2
a FRESNEL lens is disposed between the light source and the parabolic mirror
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A light distribution control device (6), if a first upper limit number (N1) ≥ the number of near-distance targets (T1), controls a lamp (2) to irradiate the near-distance targets with light having illuminance according to attributes of the near-distance targets; if a remaining number (M) ≥ the number of long-distance targets (T2), controls the lamp (2) to irradiate the long-distance targets with light having illuminance according to attributes of the long-distance targets; if N1 < Tl, controls the lamp (2) to form a light distribution pattern (PTN, PTN1) that does not depend on the near-distance targets and the long-distance targets; and, if M < T2, controls the lamp (2) to form a light distribution pattern (PTN, PTN2) that does not depend on the long-distance targets.