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AssigneeHitachi Astemo, Ltd.
InventorsHikaru Miura, Tatsumi Yamauchi, Mutsumi Kikuchi
Estimating the term…
In a case where a load current flows in an energized state where a power supply is connected to a load, it is assumed that a measured voltage fluctuates due to a voltage drop caused by contact resistance of a relay contact, and thus the relay state cannot be accurately diagnosed. A relay control device that controls a relay connected between a secondary battery and a load device calculates, in a failure diagnosis during energization with the relay being closed, a contact resistance value of the relay based on a voltage applied to the relay and a current flowing through the secondary battery, and determines a first threshold set as a variable value in accordance with a temperature change amount of the relay and compares the calculated contact resistance value with the first threshold to diagnose a failure of the relay.
A relay control device that controls a relay connected between a secondary battery and a load device, the relay control device configured to
A method of controlling a relay control device that controls a relay connected between a secondary battery and a load device, the method comprising:
Dependencies are inferred from the claim text.