US 11,927,662 B2
Determination of diagnostic plausibility of phase current measurements
Caleb W. Secrest, Noblesville, IN (US); and James R. Smith, Levittown, PA (US)
Assigned to BORGWARNER INC., Auburn Hills, MI (US)
Filed by BorgWarner Inc., Auburn Hills, MI (US)
Filed on May 12, 2022, as Appl. No. 17/742,870.
Prior Publication US 2023/0366968 A1, Nov. 16, 2023
Int. Cl. G01R 19/00 (2006.01); G01P 3/48 (2006.01); G01R 35/00 (2006.01); H02P 23/14 (2006.01)
CPC G01R 35/00 (2013.01) [G01P 3/48 (2013.01); G01R 19/0038 (2013.01); H02P 23/14 (2013.01)] 20 Claims
OG exemplary drawing
 
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.