In-Vehicle Power Line Communication Noise Control
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Solution Overview
Problem
In-vehicle communication systems require two transmission structures (data bus and supply line) for information transmission, leading to increased construction costs, system weight, and noise interference, with additional costs and processing loads when using special modulation methods to improve noise resistance.
Innovation Solution
An in-vehicle power line communication system using a single power line network with a master node and slave nodes connected via a second power line, employing a time-triggered communication protocol and a choke coil to prevent noise interference, eliminating the need for special communication lines and modulation methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two transmission structures (data bus and supply line) are used for high-importance information transmission, then communication reliability is improved, but system construction cost increases and system weight increases
Solution Approach 1:
The patent combines the data transmission function and power supply function into a single power line communication system. The power line serves dual purposes: supplying power to in-vehicle devices and transmitting communication signals. This merging eliminates the need for separate data bus structures, reducing system construction cost and complexity while maintaining communication reliability through the unified power line infrastructure.
Solution Approach 2:
The power line is designed to perform multiple functions simultaneously: it acts as both a power supply line and a data communication line. By making the power line universal, the system eliminates dedicated data bus structures, thereby reducing the number of components, lowering construction costs, and decreasing system weight while still achieving reliable communication for high-importance information.
2Device complexity
If only supply line structure is used for information transmission, then system construction cost is reduced, but noise interference increases and signal attenuation occurs
Solution Approach 1:
The patent introduces a communication control unit as an intermediary device that manages data transmission over the power line. This control unit implements communication control protocols to ensure stable signal transmission, prevent noise interference, and reduce signal attenuation. The control unit acts as a mediator between the power line infrastructure and the data transmission requirements, enabling reliable communication through the power line without requiring complex noise resistance methods.
3Object-affected harmful factors
If special modulation method for noise resistance is used, then noise resistance is improved, but system construction cost increases and processing load increases
Solution Approach 1:
The communication control unit serves as an intermediary that implements communication control protocols to provide noise resistance without requiring complex special modulation methods. The control unit manages signal transmission, handles noise filtering, and ensures reliable data reception through protocol-level control, thereby achieving noise resistance while keeping system construction cost and processing load low.
4Adaptability or versatility
If multiple devices are connected to power line for communication, then system versatility is improved, but noise absorption and signal attenuation by various components increases
Solution Approach 1:
The communication control unit acts as a central intermediary that manages communication between multiple devices connected to the power line. It implements protocols to coordinate signal transmission, prevent interference between multiple devices, and ensure that signals maintain adequate quality despite being transmitted through various connected components. The control unit monitors and manages the communication environment to maintain reliability while supporting multiple connected devices.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces system construction costs and weight while ensuring stable communication by preventing noise interference and signal absorption, allowing for efficient and cost-effective information transmission without compromising marketability.
Implementation Method 1
a choke coil (for example, a choke coil 14 in an embodiment) installed in the first power line
Data Source
AI summary
In an in-vehicle power line communication system in which a power line communication network and a battery are connected to each other via a first power line, the power line communication network includes a master power line communication node connected to the battery via the first power line, a second power line, slave power line communication nodes including at least a transmitting slave power line communication node and a receiving slave power line communication node, a transmitting-side in-vehicle device, and a receiving-side in-vehicle device. The master power line communication node and the slave power line communication nodes communicate with each other using a time-triggered communication protocol. The mutual communicating of the slave power line communication nodes are controlled by a token signal output from the master power line communication node. Only the master power line communication node and the slave power line communication nodes are connected to the second power line.