Current Sensor

An inductive current sensor measures current flow in the HV battery. This sensor locates between the positive contactor and the positive post of the HV battery. This sensor is similar to an amp clamp that can be used with a Digital Voltmeter (DVOM).

The current sensor is an input to the BPCM and is used by the HCP. The BPCM uses the current sensor to verify pre-charge operation during battery connection. The signal is used by the BPCM to check for welded contactors when the battery is commanded to disconnect the HV system.

The current sensor data can be read by the scan tool through the BPCM menu. This indicates current flow between the HV battery and the rest of the HV system. If the battery current is flowing to the TPIM and the rest of the HV system, the current displays as a positive reading. If the HV battery is being charged from the HV system, the current displays as a negative reading.

Under typical operating conditions, the current level ranges up to 200 Amps of positive or negative current flow. If the current exceeds 250 Amps, the HCP reduces HV battery usage.

The HCP uses the current signal in drivetrain management and checks for Loss of Isolation (LOI) testing.