Vehicle Lamp Control Device Reducing Storage for ADB Derating
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Solution Overview
Problem
Existing vehicle lamps with a large number of light sources face challenges in performing derating control due to high calculation loads and the need for large storage capacity to store driving current distributions for each temperature.
Innovation Solution
A control device that includes a temperature acquisition unit, a control unit, and a storage unit, which uses images to express lighting luminance as pixel brightness, allowing derating control with reduced storage capacity by combining first and second images based on temperature thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If derating control is performed for each light source in a high-definition ADB with a large number of light sources, then temperature management is improved, but calculation load and device complexity increase significantly
Solution Approach 1:
The patent divides the matrix of light sources into multiple regions, and further divides each region into multiple groups. This hierarchical segmentation allows derating control to be applied at the group level rather than individual light source level, significantly reducing calculation load while maintaining effective temperature management across the entire light source array.
Solution Approach 2:
The patent creates a virtual image representing the light distribution pattern of all light sources, where each pixel corresponds to a light source. Derating control is applied by adjusting pixel values in this virtual image according to temperature data from representative light sources, avoiding the need to calculate and control each individual light source separately.
2Reliability
If driving current distribution for each temperature is stored in advance, then derating control accuracy is improved, but storage capacity requirements increase
Solution Approach 1:
Instead of storing complete driving current distributions for each temperature, the patent stores only representative temperature data and uses this to dynamically adjust derating parameters. This changes the approach from storing detailed operational parameters to storing minimal temperature state information, dramatically reducing storage requirements while maintaining control accuracy.
Solution Approach 2:
The patent pre-calculates and stores derating control parameters and region/group divisions based on temperature thresholds. When temperature data is acquired, these pre-prepared parameters are applied directly, eliminating the need to store and process complete driving current distributions for every possible temperature condition.
Data Source
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AI summary
A headlamp (4) comprises a plurality of light sources (451), a sensor (452) that acquires the temperature of the plurality of light sources (451), a light source control unit (453), and an ADB control unit (47). The ADB control unit (47) comprises: an image generation unit (471) that outputs an image in which the respective lighting luminances of the plurality of light sources (451) are expressed as brightnesses of pixels corresponding to the respective light sources (451); and a storage unit (472) that stores a first image (I1) indicating a first luminance distribution of the lighting luminances, and a second image (I2) indicating a second luminance distribution (D2) of the lighting luminances. The light source control unit (453) individually controls the lighting luminances of the plurality of light sources (451) on the basis of the image output from the image generation unit (471). The image generation unit (471) generates a composite image (Ic) based on the first image (I1) and the second image (I2) in accordance with the measured temperature when the measured temperature is higher than a first threshold value (TH1), and starts derating control to output the composite image (Ic) to the light source control unit (453).