Motor Vehicle Headlight Sign Light Control Above the Cut-Off Line
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Solution Overview
Problem
Existing illumination devices for motor vehicle headlights cannot independently switch off sign light distribution, leading to unwanted glare and reduced safety in partial full beam mode.
Innovation Solution
Incorporating a separate sign light source and sign light injection element that directs light above the cut-off line, allowing independent control of sign light distribution, which can be switched off in partial full beam mode to prevent glare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the sign light light source is integrated with the main light source, then the device complexity is reduced, but the sign light cannot be switched off independently causing unwanted glare in partial full beam mode
Solution Approach 1:
The illumination device is segmented into independent light sources: a main light source for producing light distribution and a separate sign light light source for producing sign light light distribution. This segmentation allows independent control of each light source, enabling the sign light to be switched off in partial full beam mode without affecting the main light distribution, thereby eliminating unwanted glare while maintaining manageable device complexity through modular architecture
2Illumination intensity
If the sign light light source is switched on in partial full beam mode, then sign light visibility is improved, but unwanted scattered light causes glare to oncoming traffic
Solution Approach 1:
The illumination device implements dynamic control where the sign light light source can be independently activated or deactivated based on the operating mode. In partial full beam mode, the sign light light source is switched off to prevent scattered light glare to oncoming traffic, while in other modes it can be activated to provide sign light visibility. This dynamic, mode-dependent control resolves the contradiction between visibility and harmful scattered light
3Ease of manufacture
If the sign light light source is integrated with the main light source, then the manufacturing cost is reduced, but the sign light distribution cannot be controlled independently
Solution Approach 1:
The system is divided into separately controllable light sources with independent control circuits. The sign light light source has its own control mechanism that allows independent activation and deactivation, providing full operational flexibility. While this increases manufacturing complexity compared to an integrated design, it enables precise control over light distribution characteristics and eliminates glare issues in specific operating modes
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
Enhances safety by reducing unwanted glare and enabling better visibility for drivers by allowing independent control of sign light distribution, particularly in Advanced Driving Beam mode.
Implementation Method 1
the sign light light injection element forms the light emitted by the sign light light source into a third light beam and directs the third light beam onto the boundary surface such that light rays, in particular substantially all light rays of the third light beam enter the light-permeable body
Implementation Method 2
at least some, preferably all, of the light rays which have re-entered the light-permeable body are projected by the projection optics device as a sign light light beam
Data Source
AI summary
Illumination device for a motor vehicle headlight. The device has a light source, a light-permeable body (LPB), a light injection element for injecting light from the light source into the LPB, and a projection device. Light from the light source forms a light distribution with a cut-off line formed by a screen edge of a screen device, which is formed by a boundary surface of the LPB. A sign light light source (SLLS) and a further sign light light injection element (SLLIE) associated with the SLLS are provided. The SLLIE forms the light emitted by the SLLS into a third light beam and directs the third light beam onto the boundary surface, which re-enter the LPB and are projected by the projection optics device as a sign light light beam into a region of the light distribution lying above the cut-off line and are displayed as sign light light distribution.