Wire Bundle Fault Detection Using Known TDR Return Paths
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Solution Overview
Problem
Existing time domain reflectometry (TDR) testing in bundles of wires is prone to inaccurate fault detection due to unknown return paths, leading to intermittent faults that are difficult to detect and may result in false positives.
Innovation Solution
Identify wires in a bundle that can function as return paths by measuring crosstalk and designating them as such, using techniques like time domain reflectometry (TDR), spread spectrum TDR (SSTDR), or sequence TDR (STDR), to stabilize the impedance and reduce false positives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TDR testing is performed on bundles of wires with unknown return paths, then fault detection can be conducted, but measurement precision deteriorates due to intermittent faults and false positives
Solution Approach 1:
The system performs preliminary identification of return paths for each wire in the bundle before conducting TDR testing. By measuring crosstalk between wires and designating wires with sufficient crosstalk as return paths, the system establishes known reference paths in advance. This preliminary action eliminates the uncertainty of unknown return paths during subsequent fault detection, thereby improving both reliability and measurement precision.
2Productivity
If multiple wires in a bundle are tested simultaneously, then productivity increases, but device complexity increases due to multiple drivers and control requirements
Solution Approach 1:
The system implements a universal return path identification methodology that can be applied to any wire in the bundle regardless of its position or characteristics. The same crosstalk measurement and threshold comparison process is used for all wires, allowing the system to handle multiple wires with a standardized approach. This universality enables scalable testing of wire bundles while managing complexity through consistent procedures.
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
Stabilizes TDR testing by identifying known return paths, reducing variations in test results and improving the accuracy of fault detection in bundles of wires.
Implementation Method 1
Identify wires in a bundle that can function as return paths by measuring crosstalk
Implementation Method 2
detect a fault in the first wire based on a reflection of the signal on the first wire
Data Source
AI summary
An example system is configured to detect a fault in a bundle of wires. The bundle of wires include a first wire and a second wire. The system includes a first driver that is electrically connectable to, and electrically disconnectable from, the first wire; a second driver that is electrically connectable to, and electrically disconnectable from, the second wire; and a control system to control the first driver to electrically connect to the first wire and to output a signal to the first wire, to control the second driver to electrically connect to the second wire and to drive a static voltage to the second wire to enable the second wire to act as a signal return for the first wire, and to detect a fault in the first wire based on a reflection of the signal on the first wire.