US 11,990,655 B2
Fuel cell system and method for controlling purge thereof
Se Hoon Song, Yongin-si (KR); and Sun Ho Lee, Yongin-si (KR)
Assigned to HYUNDAI MOBIS CO., LTD., Seoul (KR)
Filed by HYUNDAI MOBIS Co., Ltd., Seoul (KR)
Filed on Aug. 12, 2022, as Appl. No. 17/886,783.
Claims priority of application No. 10-2022-0074134 (KR), filed on Jun. 17, 2022.
Prior Publication US 2023/0411656 A1, Dec. 21, 2023
Int. Cl. H01M 8/04 (2016.01); H01M 8/04089 (2016.01); H01M 8/04223 (2016.01); H01M 8/0438 (2016.01); H01M 8/04537 (2016.01); H01M 8/04746 (2016.01)
CPC H01M 8/04753 (2013.01) [H01M 8/04089 (2013.01); H01M 8/04231 (2013.01); H01M 8/04395 (2013.01); H01M 8/04559 (2013.01); H01M 8/04589 (2013.01); H01M 8/04619 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A fuel cell system comprising:
a purge valve configured to discharge hydrogen on a hydrogen supply line that passes a fuel cell stack;
an operation state monitoring device configured to monitor an operation state of the fuel cell stack; and
a controller configured to determine a purge frequency based on the operation state, and to control the purge valve based on the determined purge frequency,
wherein the controller is further configured to:
determine a first purge frequency, at which the power generation efficiency of the fuel cell stack reaches a maximum efficiency point,
wherein the controller is further configured to:
search for a second purge frequency, at which a changed maximum efficiency point is reached, while the purge frequency is adjusted in unit of a specific time period, when the maximum efficiency point for the power generation efficiency of the fuel cell stack is changed to the changed maximum efficiency point during an operation thereof.