CPC G01R 35/00 (2013.01) [G01P 3/48 (2013.01); G01R 19/0038 (2013.01); H02P 23/14 (2013.01)] | 20 Claims |
1. A method of evaluating current sensor measurements of an electric machine system, comprising:
acquiring a first current signal from a first current sensor, the first current signal corresponding to a first phase current of a three phase electric current supply to an electric machine, the first phase current separated from a second phase current by a selected phase separation;
acquiring a second current signal from a second current sensor, the second current signal corresponding to the second phase current;
measuring a machine speed;
shifting the first current signal by a signal processing component to generate a shifted first current signal having a shifted phase, the signal processing component including a tuning parameter that is a function of the machine speed, the signal processing component including an all pass filter configured to shift the first current signal using the tuning parameter;
estimating a phase difference between the shifted first current signal and the second current signal; and
determining a plausibility of the first measurement based on the difference.
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