US 12,235,312 B2
Method for checking the plausibility of insulation monitoring of a high-voltage system of an electric vehicle during the charging of a traction battery of the electric vehicle
Moritz Eitler, Stuttgart (DE); and Oliver Lehmann, Leonberg (DE)
Assigned to Dr. Ing. h. c. F. Porsche AG, Stuttgart (DE)
Filed by Dr. Ing. h.c. F. Porsche Aktiengesellschaft, Stuttgart (DE)
Filed on Sep. 13, 2022, as Appl. No. 17/944,028.
Claims priority of application No. 10 2021 127 385.4 (DE), filed on Oct. 21, 2021.
Prior Publication US 2023/0127297 A1, Apr. 27, 2023
Int. Cl. G01R 31/00 (2006.01); B60L 53/60 (2019.01); G01R 31/14 (2006.01); H02J 7/00 (2006.01)
CPC G01R 31/14 (2013.01) [B60L 53/60 (2019.02); G01R 31/006 (2013.01); H02J 7/0047 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A method for checking a plausibility of an insulation fault indication when monitoring a high-voltage system (100) of an electric vehicle when charging a traction battery of the electric vehicle at a DC voltage charging apparatus (200) capable of simultaneously charging traction batteries of other electric vehicles, the method comprising: connecting the traction battery of the electric vehicle to the DC charging apparatus (200); using an insulation monitoring device (101) on the electric vehicle to carry out a three volt-meter method for measuring three different potential differences to monitor electrical insulation of the high-voltage system (100); cyclically deactivating an active portion of the insulation monitoring device (101) of the electric vehicle; using the insulation monitoring device (101) of the electric vehicle while the active portion of the insulation monitoring device is deactivated; and continuing charging the traction battery of the electric vehicle if the three different potential differences measured by the insulation monitoring device (101) of the electric vehicle identify a cyclic pattern thereby indicating that an insulation monitoring device of a further electric vehicle is active on the DC charging device (200).