US 11,757,391 B1
Impedance estimation of power sources via motor inverter circuits
Lei Hao, Troy, MI (US); Yue-Yun Wang, Troy, MI (US); and Steven E. Muldoon, Royal Oak, MI (US)
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed by GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed on Feb. 21, 2022, as Appl. No. 17/676,535.
Int. Cl. H02P 23/14 (2006.01); G01R 27/02 (2006.01); G01R 31/389 (2019.01); B60L 15/20 (2006.01); H02P 27/08 (2006.01); H02P 29/68 (2016.01)
CPC H02P 23/14 (2013.01) [B60L 15/20 (2013.01); G01R 27/02 (2013.01); G01R 31/389 (2019.01); H02P 27/08 (2013.01); H02P 29/68 (2016.02)] 20 Claims
OG exemplary drawing
 
1. A motor drive system of a vehicle, the motor drive system comprising:
an inverter configured to receive power from a power source via a bus, wherein the inverter is connected to a motor of the vehicle, the power source being separate from the motor and comprising at least one of a battery pack, a battery module, and a cell of a battery module;
a driver configured to drive the inverter;
a filter configured to filter a current signal received from the bus to generate a filtered signal; and
one or more control modules configured to
operate in an impedance determination mode including
based on the filtered signal, control the driver and the inverter to generate a pulsed signal applied to the power source,
determine a current level and a voltage of the power source due to generation of the pulsed signal, and
determine impedance based on the current level and the voltage,
determine a characterization parameter of the power source based on the impedance; and
perform a control operation or a countermeasure based on the characterization parameter.