Failure detection method of current sensor in converter, vehicle system and electric control unit

A vehicle system comprising:

• a high voltage battery for providing power to a vehicle;
• a converter for converting a voltage of the high voltage battery into a low voltage to provide it to an electric system associated with the vehicle;
• a pre-charge relay for connecting the high voltage battery and the converter and reducing a potential difference between the high voltage battery and the converter;
• a main relay configured to connect the high voltage battery and the converter and provide the voltage of the high voltage battery to the converter when the potential difference is reduced by the pre-charge relay;
• and
• an electronic control unit configured to detect a failure of a current sensor in the converter using the pre-charge relay.

An electronic control unit in a vehicle system comprising a high voltage battery, a converter, and a pre-charge relay, the electronic control unit comprising a processor and a memory, the electronic control unit, by an operation of the processor, configured to:

• recognize a voltage value of the high voltage battery associated with a vehicle for providing power to the vehicle;
• recognize a resistance value of the pre-charge relay for connecting the high voltage battery and the converter and reducing a potential difference between the high voltage battery and the converter;
• based on the recognized voltage value of the high voltage battery and the resistance value of the pre-charge relay, calculate a reference current value of a converter associated with the high voltage battery;
• obtain a sensing current value from a current sensor in the converter;
• and
• detect whether the current sensor in the converter fails using the calculated reference current value and the sensing current value obtained from the current sensor.