Vehicle power supply system and diagnostic device

The vehicle power supply system uses an AC signal and detection methods to accurately identify intermediate short circuits and partial breaks in power cables, enhancing the reliability of in-vehicle power networks.

JP2026084516APending Publication Date: 2026-05-21ASTEMO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
ASTEMO LTD
Filing Date
2024-11-11
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

Conventional in-vehicle power networks struggle to accurately detect intermediate short circuits and partial breaks in power cables due to insulation failure or damage, leading to potential malfunctions and safety risks.

Method used

A vehicle power supply system that uses an oscillator to output an AC signal at a predetermined frequency, superimposes it on the power cable, and employs a detector to diagnose abnormalities based on voltage or current changes, allowing for precise detection of damage such as intermediate short circuits and partial breaks.

Benefits of technology

The system can accurately detect intermediate short circuits and partial breaks in power cables, ensuring reliable power distribution to in-vehicle equipment by monitoring voltage or current amplitude changes at specific frequency settings, thereby preventing malfunctions.

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Abstract

This system accurately detects damage such as short circuits and partial breaks in power cables that supply power to in-vehicle equipment. [Solution] The vehicle power supply system 100 supplies power from a battery 1 to a plurality of loads 3 mounted on a vehicle via a power cable 2 connected to the loads 3. The vehicle power supply system 100 includes an oscillator 6 that outputs an AC signal at a predetermined frequency, a capacitor 8 as a superimposer that superimposes the AC signal on point A, which is one end of the power cable 2, a resistor 7 as a detector that detects the voltage of the power cable 2 when the AC signal is superimposed on point A of the power cable 2 via the capacitor 8, and a diagnostic unit 10 that diagnoses whether or not there is an abnormality in the power cable 2 based on the voltage vo detected by the resistor 7.
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