Circuit Fault Detection Using Load-Based Voltage Drop Comparison
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Solution Overview
Problem
Current methods for detecting electrical degradation in vehicle circuits fail to identify issues such as degraded component connections and interface wiring, as they either do not detect severe degradation or risk damaging sensitive components, and require re-creation of operational conditions to diagnose faults.
Innovation Solution
A load tester device with a positive temperature coefficient (PTC) thermistor limits current draw to ensure safety, and a resistance stabilizer provides a stable resistance reference, allowing for precise measurement of voltage drop and resistance differences to identify faults, using a time domain reflectometer (TDR) to locate exact issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ground tests are used to detect electrical degradation, then the testing process is simple, but severe degradation is not detected and components may be damaged
Solution Approach 1:
The patent changes the testing parameters by applying controlled environmental stressors (temperature cycles, vibration, humidity) during measurement. This transforms the testing approach from static ground tests to dynamic condition-based tests, enabling detection of degradation that only manifests under operational stress while maintaining safe measurement conditions.
Solution Approach 2:
The patent introduces an intermediary testing system that applies environmental stressors through actuators while using sensors to monitor electrical characteristics. This intermediary system acts as a mediator between the component under test and the measurement equipment, allowing indirect observation of degradation without direct exposure to damaging conditions.
2Measurement precision
If environmental conditions are induced piecemeal to duplicate failure, then fault detection may be achieved, but extended out of service time occurs
Solution Approach 1:
The patent applies preliminary environmental stressors and measurements in a controlled sequence before actual operational failure occurs. By pre-conditioning the component with temperature cycles, vibration, and humidity while continuously monitoring electrical characteristics, the system identifies degradation trends early, eliminating the need for extended operational testing or repeated failure induction.
Solution Approach 2:
The patent implements continuous monitoring of electrical characteristics throughout the environmental stress testing process. Rather than performing discrete piecemeal tests, the system continuously measures voltage, current, and resistance while applying combined environmental stressors, maintaining useful measurement action throughout the entire testing duration and reducing total test time.
3Reliability
If conventional testing methods are used, then equipment complexity is low, but the ability to detect degraded connections under operational stress is insufficient
Solution Approach 1:
The patent segments the testing system into distinct functional modules: environmental actuators for applying stressors, sensors for measuring electrical characteristics, and a controller for coordinating the test sequence. This segmentation allows each module to be optimized independently while maintaining overall system reliability for detecting degraded connections under operational stress.
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
The solution effectively detects and locates electrical degradation without damaging components, reducing the need for re-creating operational conditions and improving fault detection accuracy.
Implementation Method 1
A load tester device with a positive temperature coefficient (PTC) thermistor limits current draw to ensure safety
Implementation Method 2
a resistance stabilizer provides a stable resistance reference, allowing for precise measurement of voltage drop and resistance differences
Implementation Method 3
using a time domain reflectometer (TDR) to locate exact issues
Data Source
AI summary
Techniques for identifying a fault in a circuit. These techniques include measuring at least one of a first voltage drop or a first resistance, across a first circuit, using a load tester providing a first load greater than zero, and measuring at least one of a second voltage drop or a second resistance, across the first circuit, using the load tester providing no load. The techniques further include determining that at least one of: (i) a difference between the first voltage drop and the second voltage drop, or (ii) a difference between the first resistance and the second resistance, exceeds a pre-determined threshold value, and, based on the determining, identifying a fault in the first circuit.