US 11,923,575 B2
Fault diagnostic apparatus for a fuel cell electric vehicle and a method therefor
Min Taek Kim, Seoul (KR); Chang Hwan Ye, Hwaseong-si (KR); Soon Gil Kweon, Hwaseong-si (KR); and Hyo Jin Park, Hwaseong-si (KR)
Assigned to HYUNDAI MOTOR COMPANY, Seoul (KR); and KIA CORPORATION, Seoul (KR)
Filed by HYUNDAI MOTOR COMPANY, Seoul (KR); and KIA CORPORATION, Seoul (KR)
Filed on Sep. 9, 2021, as Appl. No. 17/470,699.
Claims priority of application No. 10-2020-0169807 (KR), filed on Dec. 7, 2020.
Prior Publication US 2022/0181659 A1, Jun. 9, 2022
Int. Cl. G01R 31/327 (2006.01); B60L 50/70 (2019.01); B60L 58/34 (2019.01); H01M 8/04228 (2016.01); H01M 8/04303 (2016.01); H01M 8/04537 (2016.01); H01M 8/04664 (2016.01); H01M 8/04858 (2016.01)
CPC H01M 8/04679 (2013.01) [B60L 50/70 (2019.02); B60L 58/34 (2019.02); H01M 8/04228 (2016.02); H01M 8/04303 (2016.02); H01M 8/04559 (2013.01); H01M 8/0488 (2013.01); B60L 2240/527 (2013.01); H01M 2250/20 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A fault diagnostic apparatus for a fuel cell electric vehicle, the fault diagnostic apparatus comprising:
a main relay connected to a fuel cell stack;
a power converter connected to the main relay;
a heater relay connected to the fuel cell stack and the main relay at one end and connected to a cathode oxygen depletion (COD) heater at the other end; and
a fuel cell control unit (FCU) connected with the main relay, the power converter, and the heater relay,
wherein the FCU diagnoses a fault of the main relay based on an amount of change in stack voltage according to control to turn off and on the heater relay and a power of the power converter according to variable control of a voltage of the power converter, when the vehicle enters a shutdown sequence, and outputs the diagnosed result.