Vehicle Lighting Image Data Control Under CAN-FD Bandwidth Limits
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Solution Overview
Problem
Current vehicle lighting systems face challenges in transmitting high-definition image data due to limited bandwidth in CAN-FD networks, leading to inadequate data compression methods that degrade display quality, particularly for adaptive driving beams and road writing functions.
Innovation Solution
A method that dynamically adjusts the display frequency of compressed image data for transmission over a multiplexed bus, using a first frequency when the bit rate is sufficient and a second, lower frequency when it is not, to maintain high compression rates and image quality while adhering to bandwidth constraints, with a compression rate of at least 75%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-definition image data is transmitted over CAN-FD network, then lighting resolution is improved, but bandwidth limitation prevents sufficient data transmission
Solution Approach 1:
The patent extracts only the essential visual information needed for lighting functions by compressing image data to 25% or less of original size, removing redundant data while preserving critical lighting patterns for adaptive driving beams and road writing
Solution Approach 2:
The system dynamically adjusts compression parameters and transmission timing based on network bandwidth availability, switching between different compression levels and transmission schedules to optimize both image quality and data transmission efficiency under varying bandwidth conditions
2Quantity of substance
If data compression is applied to reduce bandwidth usage, then data transmission is improved, but display quality is degraded
Solution Approach 1:
The patent applies different compression strategies to different regions and elements within the image data, preserving high quality for critical lighting patterns (ADB, RW) while applying higher compression to less critical areas, ensuring display quality is maintained where needed while reducing overall data size
Solution Approach 2:
The system changes compression parameters dynamically based on the specific lighting function being transmitted, adjusting compression ratio, algorithm type, and quality thresholds to match the requirements of different lighting patterns while maintaining acceptable display quality
3Adaptability or versatility
If multiple light sources are used for high-definition projection, then lighting functionality is improved, but data synchronization complexity increases
Solution Approach 1:
The patent merges the control of multiple light sources into a unified compressed image data stream, where all lighting patterns for multiple sources are encoded together and transmitted as a single synchronized data package, eliminating the need for separate control channels and simplifying synchronization
Data Source
AI summary
A method for managing image data in a vehicle lighting system that includes a lighting module and a multiplexed bus for transmitting compressed image data to the lighting module. The method includes receiving an instruction to trigger at least one lighting function to be generated by the at least one lighting module. Determining a required data rate level for transmitting the compressed image data over the multiplexed bus. Comparing the determined data rate level with a data rate threshold value of the multiplexed bus. Compressing the image data of the lighting function according to: the first frequency when the determined data rate level is lower than or equal to the data rate threshold value and according to a second frequency selected within the frequency range such that the second frequency is lower than the first frequency when the determined data rate level is greater than the data rate threshold value.