Method for locating an insulation fault in a high-voltage network

The method efficiently locates insulation faults in high-voltage vehicle networks by disconnecting components, measuring resistances, and using a lookup table to identify faulty components, reducing wear and computational effort while ensuring safety.

DE102024134249A1Pending Publication Date: 2026-05-21DAIMLER TRUCK AG
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
DAIMLER TRUCK AG
Filing Date
2024-11-21
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

Existing methods for determining insulation faults in high-voltage networks of electric vehicles fail to accurately locate the faulty component, requiring extensive switching and calculations, leading to wear and inefficiency.

Method used

A method involving disconnecting high-voltage components from the network, measuring insulation resistance with an insulation monitor, and using a lookup table or sorting measured values to identify the component with the smallest resistance as the faulty one, reducing the need for calculations and wear.

Benefits of technology

This method efficiently locates insulation faults with reduced computational effort and wear, ensuring high-voltage safety by identifying components with insufficient insulation resistance.

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Abstract

The invention relates to a method for locating an insulation fault in a high-voltage network (1) to which several high-voltage components (2.1, 2.2 to 2.n) are connected, which can be disconnected from or connected to the high-voltage network (1) via switches (S1+, S1-, S2+, S2-, Sn+, Sn-), wherein a DC insulation resistance (R_ISO DC+, R_ISO DC-) of a high-voltage potential (HV+, HV-) of the high-voltage network (1) is measured and stored while the high-voltage components (2.1, 2.2 to 2.n) are disconnected from the high-voltage network (1), wherein the switches (S1+, S1-, S2+, S2-, Sn+, Sn-) are then successively opened for each of the high-voltage components (2.1, 2.2 to 2.n) to connect the high-voltage component (2.1, 2.2 to 2.n) with the same high-voltage potential (HV+, HV-) is closed and the measurement is repeated, thereby determining an insulation resistance that corresponds to the parallel connection of the DC insulation resistance (R_ISO DC+, R_ISO DC-) with an AC insulation resistance (R_ISO AC1+, R_ISO AC2+, R_ISO ACn+, R_ISO AC1-, R_ISO AC2-, R_ISO ACn-) of the respective high-voltage component (2.1, 2.2 to 2.n), wherein the measured insulation resistances assigned to the respective switches (S1+, S1-, S2+, S2-, Sn+, Sn-) are sorted according to their magnitude, concluding that the smallest of the measured insulation resistances, according to its assigned switch (S1+, S1-, S2+, S2-, Sn+, Sn-), indicates the high-voltage component (2.1, 2.2 to 2.n), in where an insulation fault is present.
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Citation Information

Patent Citations

  • Method for determining the insulation resistance of a vehicle's power supply network comprising several subnetworks

    DE102013209142A1