US 11,814,996 B2
Method for operating an exhaust-gas catalytic converter
Beate Rittmann, Ditzingen (DE); Jan Kappa, Ludwigsburg (DE); Marcel Alexander Schneck, Besigheim (DE); and Michael Bachner, Stuttgart (DE)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Filed by Robert Bosch GmbH, Stuttgart (DE)
Filed on Jan. 13, 2022, as Appl. No. 17/575,077.
Claims priority of application No. 10 2021 200 331.1 (DE), filed on Jan. 15, 2021.
Prior Publication US 2022/0228519 A1, Jul. 21, 2022
Int. Cl. F02D 41/02 (2006.01); F01N 3/20 (2006.01)
CPC F01N 3/2013 (2013.01) [F01N 3/2033 (2013.01); F02D 41/024 (2013.01); F02D 2200/0802 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method (200) for operating an exhaust-gas catalytic converter (130) of an internal combustion engine (110), the method comprising
ascertainment (210) of a temperature, via a temperature sensor, of the exhaust-gas catalytic converter (130),
ascertainment (220) of a heating demand, via an electronic processor, on the basis of the determined temperature,
coordination, via the electronic processor, of a plurality of heating measures by selecting, based on the heating demand, a heating strategy from a multiplicity of heating strategies comprising the use of at least of the plurality of heating measures, and
application (240) of the selected heating strategy, via the electronic processor, for heating the exhaust-gas catalytic converter (130),
wherein the plurality of heating measures comprise at least two selected from the group consisting of ignition angle adaptation, fuel metering adaptation, rotational speed increase, valve lift adjustment, secondary air supply, air/fuel ratio adaptation, lambda splitting, activation of an electrical heating device, activation of a burner, and deactivation of overrun cut-off,
wherein coordination of the plurality of the heating measures includes taking into consideration the mutual influencing of the plurality of heating measures on the ascertained temperature of the exhaust-gas catalytic converter, and
wherein the exhaust-gas catalytic converter is a three-way catalytic converter configured to convert gaseous pollutants into less harmful products.