On-Board Communication Device Multiplexing High-Band and Low-Band Signals
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Solution Overview
Problem
Existing on-vehicle network systems require multiple signal lines for efficient data transmission, which increases vehicle weight and complicates wiring, while using fewer lines leads to reduced bandwidth and increased weight.
Innovation Solution
An on-vehicle communication system utilizing a single differential signal line for both high-band and direct-current/low-band signals, allowing efficient information transmission by separating and managing communication information and management information within the same line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple signal lines are used for data transmission, then communication bandwidth and reliability are improved, but vehicle weight and wiring complexity increase
Solution Approach 1:
The patent combines multiple signal lines into a single differential signal line by multiplexing high-band communication signals and low-band management signals on the same physical medium. This merging approach maintains the communication bandwidth and reliability of multiple lines while eliminating the weight and wiring complexity of deploying actual multiple separate lines.
Solution Approach 2:
The single differential signal line is designed to serve multiple functions simultaneously: it carries both high-band communication data and low-band management signals bidirectionally. This multi-functionality allows the system to achieve the capabilities of multiple dedicated lines using a single universal transmission medium, thereby reducing vehicle weight and wiring complexity.
2Reliability
If multiple signal lines are used for data transmission, then communication reliability is improved, but wiring complexity increases
Solution Approach 1:
The patent merges multiple signal lines into one differential signal line while maintaining communication reliability through signal multiplexing and separation techniques. The high-band communication unit and low-band communication unit operate on the same physical line but use different frequency bands, ensuring reliable communication without the wiring complexity of multiple separate lines.
Solution Approach 2:
The differential signal line acts as an intermediary that carries both high-band and low-band signals simultaneously. By using frequency division multiplexing, the system can separate and process different signal types on the same line, maintaining reliability while simplifying the physical wiring infrastructure.
3Weight of moving object
If a single differential signal line is used, then vehicle weight and wiring complexity are reduced, but communication bandwidth decreases
Solution Approach 1:
The patent segments the communication spectrum into high-band and low-band frequency ranges, allowing different types of data to be transmitted simultaneously over the same differential signal line. This segmentation enables the single line to carry both high-speed communication data and low-speed management signals, effectively increasing the total communication bandwidth without adding more physical lines.
Solution Approach 2:
The patent transitions from spatial multiplexing (using multiple separate lines) to spectral multiplexing (using different frequency bands on a single line). By adding the frequency dimension to the transmission medium, the system achieves increased communication bandwidth on a single differential signal line, thereby reducing vehicle weight while maintaining high data transmission capacity.
4Device complexity
If a single differential signal line is used, then wiring complexity is reduced, but information transmission capacity per unit time decreases
Solution Approach 1:
The communication spectrum is segmented into high-band and low-band portions, enabling simultaneous transmission of different data types on a single differential signal line. This segmentation allows the system to maintain high information transmission capacity while using only one physical line, thereby reducing wiring complexity without sacrificing transmission throughput.
Solution Approach 2:
The patent changes the frequency parameter of the signal to enable multiplexing. By operating at different frequency bands (high-band for communication data, low-band for management signals), the single differential signal line can transmit multiple types of information simultaneously, maintaining high transmission capacity while simplifying the wiring infrastructure.
Data Source
AI summary
This on-vehicle communication apparatus is configured to communicate with another on-vehicle communication apparatus by using one differential signal line, and includes: a high-band communication unit configured to generate a high-band signal including communication information and output the high-band signal to the differential signal line; and a low-band communication unit configured to generate a direct-current signal or a low-band signal and to output the direct-current signal or the low-band signal to the differential signal line.