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

Claim 0:
1. A control system for a multi-phase electric machine, comprising:
an inverter configured to transfer electric energy from a rechargeable energy storage device (RESS) to the multi-phase electric machine;
a plurality of phase current sensors, wherein the plurality of phase current sensors are arranged to monitor a plurality of phase currents being transferred to the multi-phase electric machine; and
a controller;
the controller being operatively connected to the inverter and in communication with the plurality of phase current sensors;
the controller including an instruction set, the instruction set being executable to:
monitor, via the plurality of phase current sensors, the plurality of phase currents,
detect 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,
determine an extrapolated current for the respective one of the plurality of phase current sensors based upon the phase currents from others of the plurality of phase current sensors;
evaluate, via a current extrapolation routine, 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
detect a fault in the respective one of the plurality of phase current sensors based upon the current extrapolation routine and the extrapolated current.