US 11,852,088 B2
Method, computing unit, and computer program for determining an amount of hydrocarbons in an exhaust gas of a lean-operation internal-combustion engine
Herbert Schoemig, Stuttgart (DE); and Tobias Pfister, Stuttgart (DE)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Filed by Robert Bosch GmbH, Stuttgart (DE)
Filed on Feb. 17, 2023, as Appl. No. 18/171,099.
Claims priority of application No. 10 2022 201 686.6 (DE), filed on Feb. 18, 2022.
Prior Publication US 2023/0265806 A1, Aug. 24, 2023
Int. Cl. F01N 3/00 (2006.01); F02D 41/02 (2006.01); F01N 11/00 (2006.01); F01N 3/10 (2006.01)
CPC F02D 41/024 (2013.01) [F01N 3/103 (2013.01); F01N 11/002 (2013.01); F02D 41/025 (2013.01); F02D 41/027 (2013.01); F01N 2550/02 (2013.01); F01N 2550/04 (2013.01); F01N 2560/06 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method (200) for determining an amount of hydrocarbons in an exhaust gas (10) downstream of a lean-operation internal-combustion engine (110), comprising the following steps:
executing, with a computing unit coupled to the internal-combustion engine (110), a first catalyst heating mode of the internal-combustion engine (110) at a first catalyst temperature, wherein a predefinable amount of fuel having a predominantly non-combusting portion is introduced into a combustion chamber of the internal-combustion engine (110),
sensing an actual temperature change downstream of an oxidation catalyst (120) downstream of the internal-combustion engine (110) during the first catalyst heating mode,
determining, with the computing unit, the amount of hydrocarbons (cHC) in the exhaust gas (10) upstream of the oxidation catalyst (120) based on the actual temperature change,
calculating an expected temperature change (TExo_Mdl) downstream of the oxidation catalyst (120), taking into account the predefinable amount of fuel, and
correcting (rHC_Adapt) the calculation of the expected temperature change based on a difference (TExo_Dvt) between the actual temperature change and the expected temperature change (TExo_Mdl).