Dual Mode Power Line Communication Protocol Selection
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Solution Overview
Problem
Current DC power line communication systems in vehicles are prone to data errors due to interference and channel conditions, particularly when multiple vehicle systems operate simultaneously, and lack flexibility in frequency usage, making them inefficient and costly.
Innovation Solution
A power line communication system utilizing a master PLC processor that can transmit data via a multiple frequency channel communication protocol and a multiple input multiple output (MIMO) communication protocol, allowing for selectable protocols and frequency hopping to optimize signal transmission across multiple frequency channels and power lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single fixed frequency is used for power line communication, then the system is simple and cost-effective, but data error rates increase due to interference and channel conditions
Solution Approach 1:
The communication system segments the single frequency channel into multiple frequency channels (e.g., 17 kHz, 51 kHz, 85 kHz, 119 kHz, 153 kHz, 187 kHz, 221 kHz, 255 kHz, 289 kHz, 323 kHz). This segmentation allows the system to transmit data over multiple frequency paths simultaneously, reducing the impact of interference on any single frequency and thereby lowering data error rates without requiring complex error correction protocols.
Solution Approach 2:
The system dynamically changes the transmission frequency parameter by selecting from multiple available frequency channels based on current channel conditions. The master PLC processor can switch between different frequency channels to avoid interference from vehicle systems operating at specific frequencies, thereby maintaining reliable communication adaptively without increasing protocol complexity.
2Reliability
If narrowband communication is used on LIN buses, then the system is cost-effective, but interference and channel conditions cause transmission errors when other vehicle functions operate simultaneously
Solution Approach 1:
The narrowband communication channel is segmented into multiple frequency channels, allowing the system to distribute data transmission across different frequency bands. This reduces the probability that all channels will experience simultaneous interference from vehicle systems, thereby improving transmission reliability while maintaining cost-effectiveness through the use of existing power line infrastructure.
Solution Approach 2:
The system transitions from single-dimensional (single frequency) communication to multi-dimensional (multiple frequency channels) communication. By adding the frequency dimension, the system can simultaneously transmit multiple data streams over the same power line infrastructure, increasing reliability by providing alternative transmission paths when interference occurs on any single frequency channel.
3Reliability
If wideband technologies like OFDM are used, then resistance to channel conditions improves, but hardware and field implementation becomes cost prohibitive
Solution Approach 1:
Instead of implementing full OFDM with all its complex modulation schemes and processing requirements, the system applies a simplified version that uses multiple frequency channels with basic modulation. This partial implementation provides sufficient resistance to channel conditions for automotive applications while keeping hardware complexity and implementation costs manageable through selective use of frequency diversity rather than complete wideband OFDM deployment.
Solution Approach 2:
The system uses simpler, more cost-effective communication protocols that achieve adequate reliability through frequency diversity rather than investing in expensive OFDM hardware. By using multiple frequency channels with simpler modulation schemes, the system achieves comparable reliability to OFDM at a fraction of the implementation cost, making it suitable for cost-sensitive automotive applications.
4Adaptability or versatility
If symmetric power line communication systems are used, then implementation is simplified, but flexibility in adapting to different frequency bands is reduced
Solution Approach 1:
The system introduces dynamic frequency selection capability where the master PLC processor can adaptively choose from multiple frequency channels based on current channel conditions and interference patterns. This dynamic adaptation allows the system to flexibly respond to changing electromagnetic environments in the vehicle without requiring complex reconfiguration of the entire communication system, achieving adaptability through intelligent frequency management rather than hardware complexity.
Data Source
AI summary
A system for communication over automotive power lines is described. The system includes a plurality of vehicle modules. Each of the vehicle modules includes a power line communication (PLC) module. A PLC network connects the power lines configured to carry electric power to the vehicle modules. The PLC processors enable the power lines to transmit data between the plurality of vehicle modules. The system also includes a master PLC processor configured to transmit data to one or more of the plurality of vehicle modules via one of two selectable protocols that include a multiple frequency channel communication protocol and a multiple input multiple output (MIMO) communication protocol.