Patent ID: 7269535
Filing Date: 2007-09-11
Classification: B60L,H02H,Y02T

Abstract:
1. A fault diagnosing apparatus for a vehicle, said vehicle including a direct current power supply, an electric circuit supplied with a current from said direct current power supply, a connecting portion that includes a plurality of relays and that connects and disconnects a path supplying the current from said direct current power supply to said electric circuit, and a sensing portion monitoring the path between said connecting portion and said electric circuit; wherein said fault diagnosing apparatus comprises a control portion providing control to connect and disconnect said connecting portion, wherein said control portion brings part of said plurality of relays into conduction to make a provisional determination of conduction fault of a relay that is to be non-conductive in accordance with an output of said sensing portion, and when a result of said provisional determination indicates fault, said control portion stores the output of said sensing portion as a first value and provides control to once change a state of at least one of said plurality of relays and to return the changed state back, and thereafter compares said first value and another output of said sensing portion to determine whether or not to confirm said provisional determination.