Method for regulating a filling of an exhaust gas component storage of a catalytic converter in the exhaust gas of an internal combustion engine

US10927738B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Martin Knopp · Lambach, DE
• Alexandre Wagner · Stuttgart, DE
• Michael Fey · Wiernsheim, DE

Key dates

• Filing date: Jun 19, 2019
• Grant date: Feb 23, 2021
• Expiry date: Jun 19, 2039

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

A method for regulating filling an exhaust gas component (EGC) storage of a catalytic converter (CC) in the exhaust gas (EG) of an internal combustion engine. An actual fill level (AFL) of the EGC storage is ascertained using a first system model (FSM), to which signals of a first EG sensor projecting into the EG flow upstream from the CC and detecting a concentration of the EGC and a second EG sensor, downstream from the CC and exposed to the EG, are fed. A base lambda setpoint value for a first control loop (CL) is predefined by a second CL, which is adjusted to the AFL using the AFL ascertained using the FSM when the voltage of the second EG sensor indicates a breakthrough of rich/lean EG downstream from the CC and an excessively low/high AFL of the EGC storage. Also described is a control unit to perform the method.