US 11,939,903 B2
Method for operating an exhaust burner, apparatus for performing such a method, and motor vehicle
Christian Disch, Wimsheim (DE); Patrick Hoff, Tamm (DE); Torsten Kunz, Waldbronn (DE); and William Krein, Neckarzimmern (DE)
Assigned to ROBERT BOSCH GMBH, Stuttgart (DE)
Filed by Robert Bosch GmbH, Stuttgart (DE)
Filed on Apr. 19, 2023, as Appl. No. 18/303,450.
Claims priority of application No. 10 2022 206 800.9 (DE), filed on Jul. 4, 2022.
Prior Publication US 2024/0003278 A1, Jan. 4, 2024
Int. Cl. F01N 3/20 (2006.01)
CPC F01N 3/2033 (2013.01) [F01N 2240/14 (2013.01); F01N 2610/03 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for operating an exhaust burner with a secondary air system, the exhaust burner being arranged in an exhaust system downstream of a combustion engine of a motor vehicle, the combustion engine being a diesel engine, the method comprising the following steps:
activating an ignition device as a function of a release condition, wherein the ignition device is heated up to a specifiable target temperature, the ignition device being a glow plug;
metering fuel at a first time point into a combustion chamber of the exhaust burner at a specifiable first injection frequency using an injection valve, wherein the combustion chamber is not actively supplied with air, and wherein the fuel is diesel fuel;
setting a first target air-mass flow using the secondary air system at a further, second time point, wherein an air-mass flow is increased strictly monotonically;
controlling an air-fuel ratio to a first target air-fuel ratio as a function of a lambda sensor starting from the second time point, and metering fuel at a specifiable second injection frequency; and
setting a second target air-mass flow at a further, third time point.