Vehicle Interior Lighting LIN Fail-Safe Without Response Delay
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle interior lighting systems with slave nodes require state information transmission for fail-safe operations, which negatively impacts the responsiveness of the slave nodes, particularly in lighting systems where lamp units are involved.
Innovation Solution
A vehicle interior lighting system employing LIN communication with a host ECU that transmits operation and fail-safe operation instruction signals to lamp units, allowing them to perform fail-safe operations without bidirectional communication, thereby maintaining responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If state information transmission is implemented for fail-safe operation, then system reliability is improved, but slave node responsiveness deteriorates
Solution Approach 1:
The patent extracts the fail-safe function from the normal operation cycle by having slave nodes autonomously execute fail-safe processing when communication interruption is detected, rather than requiring master node commands. This separation allows fail-safe operation to occur independently without interfering with normal operation responsiveness.
Solution Approach 2:
The slave nodes perform preliminary detection of communication status and autonomously initiate fail-safe processing before the master node can respond. By detecting communication interruption and executing fail-safe operations in advance, the system maintains reliability without waiting for master node commands that would delay responsiveness.
2Reliability
If bidirectional communication is required for fail-safe operation, then system reliability is improved, but device complexity increases
Solution Approach 1:
Slave nodes are empowered to autonomously detect communication interruptions and execute fail-safe processing without requiring bidirectional communication with the master node. Each slave node independently monitors its own communication status and self-manages fail-safe operations, eliminating the need for complex master-slave coordination protocols.
Solution Approach 2:
Instead of the master node controlling fail-safe operations through commands (traditional master-slave approach), the slave nodes independently determine when fail-safe processing is needed and execute it autonomously. This inversion of control authority simplifies the communication protocol by eliminating the need for complex command-response sequences.
Data Source
AI summary
A vehicle interior lighting system that performs LIN communication. The vehicle interior lighting system includes plural lamp units connected by a single bus cable, and a host ECU that is connected to the bus cable and controls operation of the plural lamp units. The host ECU transmits a fail-safe operation instruction signal to the plural lamp units after transmitting an operation instruction signal to the plural lamp units. The plural lamp units, when receiving the operation instruction signal properly, operate according to operation instruction information included in the operation instruction signal and ignore the fail-safe operation instruction signal and, when failing to receive the operation instruction signal properly, perform a fail-safe operation according to fail-safe operation instruction information included in the fail-safe operation instruction signal.