Vehicle Headlamp Group Control for Thermal Derating
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Solution Overview
Problem
High-resolution vehicle headlamps experience temperature increases due to thermal coupling of light sources, leading to potential damage, and existing derating methods reduce overall light power, compromising illumination quality and user comfort.
Innovation Solution
A headlamp assembly with a temperature sensor and control device that selectively reduces power to specific groups of light sources based on operating situations, such as velocity, traffic conditions, and future route analysis, to maintain optimal thermal balance and prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the light power of all light sources is reduced by decreasing current supply, then the thermal output is reduced and the headlamp is cooled, but the illumination quality and user comfort are compromised
Solution Approach 1:
The patent divides the multiplicity of light sources into at least two separate groups (first group and second group) that can be controlled independently. This segmentation allows selective power reduction of only one group when thermal management is needed, while the other group continues to operate at full power, thereby maintaining adequate illumination quality while still achieving cooling effect.
Solution Approach 2:
The patent applies different power levels to different groups of light sources based on local thermal conditions and operating requirements. Instead of uniformly reducing all light sources, the control device selectively reduces power to specific groups, creating local quality differences in illumination and thermal output across the headlamp assembly.
2Duration of action of stationary object
If the light power of all light sources is continuously reduced to prevent overheating, then the headlamp can operate continuously without damage, but the illumination quality becomes insufficient for user comfort
Solution Approach 1:
By segmenting light sources into controllable groups, the system can maintain continuous operation with one group at reduced power while another group compensates for illumination quality, enabling sustained headlamp operation without compromising user comfort.
Solution Approach 2:
The control device dynamically adjusts the power distribution between different light source groups based on real-time thermal conditions and operating situations. This dynamic control allows the system to optimize between continuous operation and illumination quality, switching between different power distribution strategies as needed.
3Temperature
If selective power reduction of specific light source groups is implemented based on operating situations, then illumination quality is maintained while preventing overheating, but the control system complexity increases
Solution Approach 1:
The segmentation of light sources into controlled groups provides a straightforward control architecture where each group can be independently managed. This modular approach simplifies the control logic compared to managing individual light sources, as the control device only needs to switch between predefined groups rather than individually control each light source.
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
Enables continuous, comfortable illumination by selectively reducing power to specific light source groups, preventing overheating and allowing high-power operation of other groups, thus maintaining illumination quality and preventing damage to the headlamp.
Implementation Method 1
The temperature sensor is configured to detect a temperature in the at least one headlamp
Implementation Method 2
High-resolution headlamps for vehicles comprise a multiplicity of light sources for illuminating surroundings of a vehicle
Implementation Method 3
Due to the thermal coupling of particular light sources of a headlamp, a temperature increase in the headlamp may occur during a continuous, joint activation of a multiplicity of light sources
Data Source
AI summary
A headlamp assembly for illuminating surroundings of a vehicle, including at least one headlamp, a temperature sensor, and a control device. The at least one headlamp comprising a multiplicity of light sources, the multiplicity of light sources (being divided into a first group and at least one second group. The temperature sensor being configured to detect a temperature in the at least one headlamp. The light sources of the multiplicity of light sources being thermally coupled. The control device being configured to ascertain a current temperature ascertained by the temperature sensor in the at least one headlamp and, in the case that the current temperature in the at least one headlamp exceeds a predefined temperature threshold value, to select the first group or the at least one second group for a power reduction, depending on an operating situation of the vehicle and to reduce the power of the selected group.