Abstract
Because of the manifold electronic components, their operation reliability is critical for driving safety. Thus, defects in the wiring harnesses and connectors that may occur in a driving environment should be inspected. This study seeks to determine why conventional cable diagnosis techniques are difficult to apply directly due to the in-vehicle wiring characteristics. To solve this problem, this study proposes a standing wave reflectometry method, which involves measuring the reflection coefficient by generating a frequency sweep signal and acquiring the magnitude of the reflected signal for each frequency. Defects were detected by comparing the reflection coefficients of a normal wiring harness and connector with those from the inspection. Experiments were conducted in both laboratory and driving environments. Following the reflection coefficients being classified into a decision tree, a true positive ratio of 99% and a false discovery rate of 1% were found for open faults.
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