Vehicle Headlamp LED Adjustment for Stable Light Distribution
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Solution Overview
Problem
Existing vehicle headlamp systems struggle to maintain a predefined light distribution independently of changes in vehicle state variables such as inclination and steering, requiring complex adjustments involving both light pixels and headlamp position changes.
Innovation Solution
A headlamp system with an LED adjustment unit that moves linearly and pivots about the optical axis, using a precision adjustment unit to compensate for vehicle state changes, and a control unit that generates control signals based on sensor data to adjust the LED light source and light pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the entire headlamp or phosphor converter is adjusted mechanically to compensate for vehicle state changes, then large adjustments in light distribution are achieved, but the device complexity increases
Solution Approach 1:
The invention segments the adjustment function by providing separate adjustment units for different components: a first adjustment unit for the LED light source and a second adjustment unit for the phosphor converter. This segmentation allows independent optimization of each adjustment mechanism, reducing the complexity of any single adjustment unit while maintaining the ability to perform both small and large light distribution adjustments.
Solution Approach 2:
The system employs dynamic adjustment capabilities where the LED light source and phosphor converter can be adjusted independently based on detected vehicle state changes. The control unit dynamically selects which component to adjust and by how much, enabling adaptive compensation for various driving conditions without requiring a single complex adjustment mechanism.
2Measurement precision
If separate light pixels are controlled for small adjustments, then high resolution light distribution control is achieved, but the device complexity increases
Solution Approach 1:
The invention divides the control system into distinct functional segments: a control unit that detects vehicle state changes, a first adjustment unit for mechanical LED positioning, and optionally a second adjustment unit for phosphor converter positioning. This segmentation simplifies the control logic compared to managing individual light pixels, while still achieving precise light distribution control through coordinated adjustment of the light source and converter positions.
Solution Approach 2:
The invention introduces mechanical adjustment units as intermediary components between the control system and the light output. By positioning the LED light source and phosphor converter at different locations, these intermediaries enable precise control of the light distribution pattern without requiring direct control of each individual light pixel, thereby reducing system complexity.
Data Source
AI summary
A headlamp for vehicles is provided that has an LED light source containing numerous light pixels. The headlamp also includes an optics unit in front of the light source in the main beam direction (H) with which the light pixels are mapped onto a predefined light distribution (LV1, LV2, LV2′, LV2″). The headlamp also includes a sensor unit for determining at least one vehicle state variable, an adjustment unit for adjusting a part of the headlamp, and a control unit for controlling the light pixels and the adjustment unit. The LED adjustment unit moves the light source in a linear direction transverse to an optical axis (A) of the optics unit, and/or pivoted about the optical axis (A) of the optics unit, from a starting position to an intermediate position and back, on the basis of a change in the vehicle state variable.