US 12,271,187 B2
Prediction of resolver malfunctions
Jiyu Zhang, Sterling Heights, MI (US); and Brian J. Gallert, Lake Orion, MI (US)
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed by GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed on Nov. 23, 2022, as Appl. No. 17/993,322.
Prior Publication US 2024/0168474 A1, May 23, 2024
Int. Cl. G05B 23/02 (2006.01); G01R 31/34 (2020.01)
CPC G05B 23/0283 (2013.01) [G01R 31/343 (2013.01); G05B 23/0275 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of monitoring a propulsion system of a vehicle, the method comprising:
determining a health indicator from a diagnostic signal acquired from a processing device, the diagnostic signal based on electrical outputs from a resolver connected to an electric motor of the propulsion system, the diagnostic signal related to at least one of a resolver offset and a resolver wobble;
calculating a reference value based on values of the health indicator determined during a first time period;
monitoring the health indicator over a second time period, wherein the monitoring includes continuously or periodically calculating a trend value of the health indicator over a plurality of cycles;
comparing each trend value to the reference value and estimating a difference between the trend value and the reference value for each cycle, and predicting whether a fault will occur based on the difference;
based on the predicting indicating that a fault will occur, outputting a fault indication; and
controlling operation of the vehicle based on the fault indication.