Vehicle Power Wire Retrofit for Interference-Isolated Data Links
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Solution Overview
Problem
Existing vehicle wiring, used for transmitting DC current, is unshielded and bundled, leading to undesirable interference in data signals when used for carrying video or other data signals.
Innovation Solution
The method involves cutting an existing DC current supply wire at its opposite ends and inserting inductors in series with the wire at each end, creating a clean intermediate section that can carry data signals without interference from the vehicle's electrical system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If existing unshielded vehicle wiring is used to transmit data signals, then installation time and complexity are reduced, but the data signals experience high-frequency interference from ignition and injector pulses
Solution Approach 1:
The existing wire is divided into three sections by cutting it at both ends and inserting inductors in series. The intermediate section between the two inductors forms an isolated transmission line that is electrically separated from the rest of the vehicle wiring, thereby preventing high-frequency interference from reaching the data transmission path while maintaining the use of existing unshielded wiring
Solution Approach 2:
Inductors are introduced as intermediary components between the data transmission line and the rest of the vehicle electrical system. These inductors act as filters that block high-frequency interference from ignition and injector pulses while allowing the data signals to pass through the intermediate wire section, thus resolving the interference problem without requiring shielded cables
2Object-affected harmful factors
If shielded coaxial cable is used for video signal transmission, then interference is eliminated, but installation time increases significantly and additional connections are required
Solution Approach 1:
The existing DC power supply wire is made multi-functional by modifying it to carry both DC current and data signals simultaneously. Through the insertion of inductors that isolate an intermediate section, the same wire serves dual purposes: powering electrical loads and transmitting video/data signals, thereby eliminating the need for separate shielded coaxial cable installation
Solution Approach 2:
The existing vehicle wiring harness is made to serve itself by enabling data transmission through its own structure. Rather than requiring additional dedicated communication wiring, the DC power wires are retrofitted with inductor-based isolation to create self-contained data transmission paths within the existing wiring infrastructure
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
This solution effectively isolates the data transmission line from high-frequency interference, allowing for clear transmission of video or other data signals over existing vehicle wiring without the need for additional shielding or wiring.
Implementation Method 1
inserting a respective inductor in series with the wire at each of the opposite ends, to define an intermediate wire section that extends between the two inductors
Data Source
AI summary
A method and apparatus are disclosed for enabling an existing wire supplying DC current to an electrical load of a vehicle to serve as a clean line for transmission of a data signal without interference from electrical systems of the vehicle. The method comprises identifying opposite ends of the existing wire, cutting the wire at the opposite ends and inserting a respective inductor in series with the wire at each of the opposite ends, to define an intermediate wire section that extends between the two inductors, and coupling data transmitting and receiving units to the intermediate section of the wire to permit data transfer between the transmitting and receiving units.