Patent ID: 11876472
Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Field: Measurement (Instruments)
Classification: CPC H  G | IPC H

Claim 14:
15. A method for monitoring a control system for a multi-phase electric machine, comprising:
monitoring, via a plurality of phase current sensors, the plurality of phase currents transferred from an inverter to the multi-phase electric machine;
detecting that one of the plurality of phase currents is outside a linear measurement range of a respective one of the plurality of phase current sensors based upon the phase currents from others of the plurality of phase current sensors;
determining an extrapolated current for the respective one of the plurality of phase current sensors;
evaluating the respective one of the plurality of phase current sensors, including:
determining a zero-sum-shift parameter based upon the extrapolated current for the respective one of the plurality of phase current sensors, and
evaluating the respective one of the plurality of phase current sensors based upon the zero-sum-shift parameter and a respective one of the monitored phase currents; and

detecting a fault in the respective one of the plurality of phase current sensors based thereon.