Vehicle Lighting Image Compression on CAN Bus
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Solution Overview
Problem
Existing vehicle lighting systems face challenges in efficiently transmitting high-definition image data over limited bandwidth networks like CAN bus, leading to reduced display quality and potential illegibility of lighting functions.
Innovation Solution
A method involving selective data compression and decompression techniques, utilizing pixelated LED sources and control systems to manage image data transmission, ensuring high-definition lighting functions like Adaptive Driving Beam and road markings maintain quality while adhering to bandwidth constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If image data is transmitted every time the headlight device is operated, then the latest image data can be received, but data transmission efficiency deteriorates due to redundant transmissions
Solution Approach 1:
The system performs preliminary actions by determining whether the headlight device is actually operated before transmitting image data. The control unit checks the operation status and only initiates transmission when necessary, preventing redundant transmissions while ensuring the latest data is sent when the headlight is actually used.
Solution Approach 2:
The system implements feedback mechanisms by continuously monitoring the operation status of the headlight device and using this information to control data transmission. The control unit receives operation information and adjusts transmission behavior based on this feedback, transmitting data only when the headlight device is determined to be operated.
2Reliability
If image data is transmitted regardless of operation status, then data availability is maintained, but energy consumption increases due to unnecessary transmissions
Solution Approach 1:
The system performs preliminary checks of the operation status before initiating data transmission. By determining in advance whether the headlight device is operated, the system avoids unnecessary energy consumption from redundant transmissions while ensuring data is available when actually needed.
Solution Approach 2:
The control unit autonomously manages data transmission by self-determining the operation status and controlling transmission accordingly. The system serves itself by intelligently deciding when transmission is necessary, eliminating waste of energy on unnecessary communications.
3Use of energy by moving object
If image data transmission is controlled based on operation status, then energy efficiency improves, but device complexity increases due to additional control logic
Solution Approach 1:
The control unit performs multiple functions: it controls the light emitter, receives operation information, determines operation status, and controls image data transmission. By making the control unit universal and multi-functional, the system achieves energy-efficient controlled transmission without adding separate dedicated components, thus limiting the increase in device complexity.
Data Source
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AI summary
The invention relates to a method for managing image data in a vehicle lighting system (SYS), the lighting system comprising: - a lighting module (MOD) capable of projecting lighting functions on the basis of compressed image data, and - a multiplexed bus (CAN) for transmitting compressed image data to the lighting module (MOD), the method involving the following steps: - receiving an instruction to trigger a lighting function (HB, ADB, RW), the lighting function (HB, ADB, RW) being configured to be generated by the lighting module (MOD) from compressed image data corresponding to lighting patterns having L rows, L being an integer; - determining the image data to be compressed from among the image data of the lighting patterns of the at least one lighting function (HB, ADB, RW) by selecting the image data of X rows from the L rows of the lighting patterns, X being an integer smaller than L; - compressing the image data determined as having to be compressed; - transmitting the compressed image data to the lighting module (MOD) via the multiplexed bus (CAN) in order for the lighting function (HB, ADB, RW) to be generated and projected.