Vehicle Headlamp Cutoff Gradient for ADB Glare and Visibility
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Solution Overview
Problem
Existing vehicle headlamps struggle to balance the need for reducing glare to oncoming vehicles while maintaining good visibility and long-distance illumination, as current adaptive driving beam (ADB) systems either cause glare with sharp light-dark boundaries or deteriorate visibility with blurred boundaries.
Innovation Solution
A vehicle headlamp design that varies the degree of blurring of the cutoff line based on the light distribution pattern, using an LED array to independently control light emission, forming a low beam pattern with a blurred central cutoff line for improved visibility and a high beam pattern with a sharp cutoff line to reduce glare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a sharp light-dark boundary is formed in low beam pattern, then glare to preceding vehicles is reduced, but long-distance visibility and driver comfort are deteriorated
Solution Approach 1:
The patent applies local quality by creating different brightness gradient characteristics at different locations of the cutoff line. The central portion of the cutoff line has a first brightness gradient characteristic, while the non-central portions have a second brightness gradient characteristic. This allows the central region to provide good visibility while non-central regions reduce glare to oncoming and preceding vehicles.
Solution Approach 2:
The cutoff line is segmented into multiple regions: a central portion and non-central portions (left and right sides). Each segment is assigned different brightness gradient characteristics to fulfill different functional requirements - the central segment for visibility and the non-central segments for glare reduction.
2Illumination intensity
If a blurred cutoff line is formed in low beam pattern, then long-distance visibility is improved, but glare to preceding vehicles is increased
Solution Approach 1:
Different regions of the cutoff line are assigned different brightness gradient characteristics. The central portion uses a first brightness gradient that provides blurred transition for good visibility, while non-central portions use a second brightness gradient that creates sharper transitions to reduce glare to oncoming and preceding vehicles.
Solution Approach 2:
The cutoff line is divided into functional segments - a central segment for visibility enhancement and non-central segments for glare control. This segmentation allows simultaneous achievement of both visibility improvement and glare reduction in different spatial zones.
3Ease of manufacture
If uniform brightness gradient is applied to cutoff line, then manufacturing is simplified, but adaptability to different driving conditions is reduced
Solution Approach 1:
The patent implements dynamic adaptability by allowing the control unit to selectively apply different brightness gradient characteristics (first or second) to different portions of the cutoff line based on the required light distribution pattern. This enables the system to adapt between low beam, high beam, and ADB patterns while maintaining manufacturing feasibility through standardized LED array design.
Solution Approach 2:
The LED array and control unit are designed to provide multiple functions - they can create both blurred and sharp cutoff lines, support different beam patterns (low beam, high beam, ADB), and adapt to various driving conditions. This multi-functionality is achieved through programmable control of LED brightness gradients without requiring multiple physical components.
Data Source
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AI summary
A vehicle headlight (10) capable of emitting an ADB light distribution pattern (PH) and a low beam light distribution pattern (PL), wherein a first brightness gradient (G1) in the up-down direction on a first cutoff line (CL1) that is formed when the low beam light distribution pattern (PL) is emitted and that extends in the left-right direction is different from a second brightness gradient (G2) in the left-right direction on a second cutoff line (CL2) that is formed when the ADB light distribution pattern (PH) is emitted and that extends in the up-down direction between an illuminated area and a non-illuminated area.