Insulation failure diagnosis apparatus and method of diagnosing insulation failure

摘要

An insulation failure diagnosis apparatus is provided which diagnoses presence/absence of insulation failure between a body of a vehicle and a connection path to a power supply for a traction unit. The apparatus includes a power converter circuit connected to the power supply and supplying power to an in-vehicle auxiliary unit, an outputting unit outputting an AC signal to the connection path, and a diagnosis unit diagnosing presence/absence of the insulation failure based on a current flowing through the connection path when the AC signal is outputted. The diagnosis unit includes a storage unit storing a determination value for determining the insulation failure or information for setting the determination value. The determination value or the information is obtained by measuring an electrical state quantity of the connection path depending on stray capacitance and is dielectric resistance of the connection path obtained when an AC signal is outputted to the connection path.

主权项

1. An insulation failure diagnosis apparatus which diagnoses presence or absence of insulation failure between a body of a vehicle and a connection path to a power supply for a traction unit installed in the vehicle, comprising:
at least one power converter circuit which is connected to the power supply and supplies power to at least one in-vehicle auxiliary unit; an outputting unit which outputs a diagnosis AC signal to the connection path; and a diagnosis unit which diagnoses presence or absence of the insulation failure on the basis of a current flowing through the connection path when the diagnosis AC signal is outputted, wherein the diagnosis unit includes a storage unit which stores a determination value for determining the insulation failure or information for setting the determination value, and the determination value or the information is obtained by measuring an electrical state quantity of the connection path which depends on stray capacitance and dielectric resistance of the connection path obtained when an AC signal is outputted to the connection path when the power converter circuit is connected to the power supply.