US 11,987,148 B1
Optimal control strategy for a distributed low voltage system with unidirectional direct current converters
Jun-mo Kang, Ann Arbor, MI (US); Muhammad Hussain Alvi, Troy, MI (US); and Mohamed Kamel, Rochester, 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. 14, 2023, as Appl. No. 18/168,750.
Int. Cl. B60L 58/22 (2019.01); H02M 3/335 (2006.01)
CPC B60L 58/22 (2019.02) [H02M 3/33569 (2013.01); B60L 2210/10 (2013.01); B60L 2240/529 (2013.01); B60L 2240/547 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A vehicle system comprising:
direct current to direct current (DC/DC) converters configured to regulate high electrical voltages from high voltage battery modules and output regulated electrical currents to a low voltage battery; and
a control system coupled to the DC/DC converters, the high voltage battery modules, and the low voltage battery, wherein the control system is configured to differentially vary electrical currents input to the DC/DC converters in order to balance states of charge in the high voltage battery modules, by:
calculating sets of the electrical currents that balance the states of charge in the high voltage battery modules based on a plurality of values for a low voltage regulator electrical current, in advance to knowing a value for the low voltage regulator electrical current;
interpolating the sets of the electrical currents to be input to the DC/DC converters in response to receiving the value for the low voltage regulator electrical current, the value received being one of the plurality of values; and
in response to interpolating, selecting an interpolated set of the electrical currents from the sets of the electrical currents as input to the DC/DC converters in accordance with the value received, thereby causing the DC/DC converters to output regulated electrical currents to the low voltage battery.