US 11,808,226 B2
Method, processing unit, and computer program for operating an exhaust gas system
Alexander Baumann, Ostercappeln-Venne (DE); Frank Meier, Stuttgart (DE); and Jan Kappa, Ludwigsburg (DE)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Filed by Robert Bosch GmbH, Stuttgart (DE)
Filed on Oct. 5, 2022, as Appl. No. 17/960,366.
Claims priority of application No. 102021211247.1 (DE), filed on Oct. 6, 2021.
Prior Publication US 2023/0106310 A1, Apr. 6, 2023
Int. Cl. F02D 41/02 (2006.01); F02D 41/14 (2006.01)
CPC F02D 41/0295 (2013.01) [F02D 41/1454 (2013.01); F02D 41/1475 (2013.01); F02D 2200/0814 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method (200) for operating an exhaust gas system (120) including a first catalytic converter (122) and at least one second catalytic converter (124), which is arranged downstream from the first catalytic converter (122), wherein the exhaust gas system (120) is arranged downstream from an internal combustion engine (110), the method comprising:
controlling (210) the internal combustion engine (110) to generate a rich exhaust gas having a first rich gas portion,
ascertaining (220) a fill level of the second catalytic converter (124) with respect to at least one lean gas component that is storable in the second catalytic converter and, if the ascertained fill level drops below (230) a minimum fill level,
controlling (240) the internal combustion engine (110) to generate a lean exhaust gas,
subsequently controlling (250) the internal combustion engine (110) to generate a rich exhaust gas having a second rich gas portion, which is higher than the first rich gas portion, and
subsequently controlling (210) the internal combustion engine (110) to generate the rich exhaust gas having the first rich gas portion,
wherein the minimum fill level is less than a maximum storage capacity of the second catalytic converter (124).