Matrix Beam Headlamp Hysteresis Control for Glare-Free High Beams
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Solution Overview
Problem
Matrix beam headlamps with glare-free high-beam functions experience unsteady light patterns due to frequent switching of light segments, causing discomfort and stroboscopic effects for drivers, especially when objects are near segment boundaries.
Innovation Solution
Implementing hysteresis boundaries for each segment to control the switch-on and switch-off points, allowing for a transition function in light power changes, reducing unnecessary switching cycles and providing a smoother light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If segments are switched on and off to protect road-users from glare, then glare-free high beam is achieved, but unsteady light pattern and stroboscopic effect occur
Solution Approach 1:
The patent applies preliminary action by defining switch-on and switch-off boundaries in advance through hysteresis zones. These boundaries are predetermined based on object position relative to segment boundaries, preventing the need for rapid switching decisions. When an object approaches a segment boundary, the hysteresis mechanism proactively determines which segment should be active based on pre-defined spatial thresholds, eliminating reactive switching oscillations and stabilizing the light pattern.
2Object-affected harmful factors
If segments are switched rapidly to adapt to object position, then glare-free high beam is achieved, but driver comfort deteriorates due to noticeable light changes
Solution Approach 1:
The hysteresis boundaries are predetermined and stored, allowing the control unit to make immediate decisions about segment activation without rapid switching. This preliminary definition of switch-on/switch-off conditions based on object position eliminates noticeable light changes while maintaining glare protection.
3Ease of manufacture
If fixed segment boundaries are used for light distribution, then manufacturing simplicity is maintained, but unnecessary switching cycles occur when objects are near boundaries
Solution Approach 1:
The patent segments the light distribution into multiple controllable segments with individually defined switch-on and switch-off boundaries. This segmentation allows each segment to have optimized hysteresis zones, reducing unnecessary switching cycles when objects are near boundaries while maintaining the manufacturing simplicity of fixed geometric segment definitions.
Solution Approach 2:
By pre-defining hysteresis boundaries for each segment during the manufacturing/setup phase, the system eliminates the need for complex real-time boundary calculations. The control unit simply compares object position against these predetermined boundaries, significantly reducing switching cycle frequency while maintaining ease of manufacture.
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
This approach minimizes noticeable light changes, enhancing driver comfort and acceptance by avoiding abrupt transitions and ensuring continuous light adjustments, thus reducing the stroboscopic effect.
Implementation Method 1
different switch-on and switch-off boundaries (hysteresis) are used for each segment
Data Source
AI summary
A method for controlling a matrix beam headlamp (M) with adaptive light functions in which using non-glare lighting and/or targeted lighting of objects (O) with segments (S1-Sn) of the light distribution of the matrix beam headlamp (M). Different switch-on and switch-off boundaries are defined for the individual segments (S1-Sn).