US 12,134,332 B2
Protocol for discharging DC power from propulsion battery pack to offboard charging station
Aniket P. Kothari, Rochester Hills, MI (US); Bryan T. Sauter, New Hudson, MI (US); and Ian Forsman-Kendall, Novi, MI (US)
Assigned to GM Global Technology Operations LLC, Detroit, MI (US)
Filed by GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed on Dec. 9, 2021, as Appl. No. 17/546,162.
Prior Publication US 2023/0182601 A1, Jun. 15, 2023
Int. Cl. B60L 53/62 (2019.01); B60L 53/65 (2019.01); B60L 53/66 (2019.01)
CPC B60L 53/62 (2019.02) [B60L 53/65 (2019.02); B60L 53/66 (2019.02)] 20 Claims
OG exemplary drawing
 
1. A method for coordinating a discharge session in which direct current (DC) power is offloaded from a power supply of an electrical system to a bidirectional offboard charging station, the bidirectional offboard charging station being connected to alternating current (AC) grid power, the method comprising:
in response to a connection of the power supply to the offboard charging station via a charging cord set during a power outage of the AC grid power, exchanging charging data between a processor of the electrical system and a processor of the offboard charging station over a low-voltage communication line, the charging data including power and current limits of the electrical system and power and current limits of the offboard charging station;
assigning an unused range in respective power and current limits of the electrical system and the offboard charging station, the unused range being a designated upper portion of a protocol-specific range, the designated upper portion of the protocol-specific range being indicative of negative power and current limits and represents a request for the discharge session;
in response to the power and current limits of the offboard charging station being in the designated upper portion of the protocol-specific range, transmitting the power and current limits of the electrical system to the offboard charging station, thereby confirming the request for the discharge session; and
initiating the discharge session via the processor of the electrical system in response to confirming the request.