Method and control unit for operating an internal combustion engine which has a first exhaust-gas purification component and a second exhaust-gas purification component

US11098668B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

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

Key dates

• Filing date: Oct 18, 2019
• Grant date: Aug 24, 2021
• Expiry date: Oct 18, 2039

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method for operating an internal combustion engine which has an exhaust-gas system in which a first exhaust-gas purification component and a second exhaust-gas purification component are arranged, and which has an opening-in point via which secondary air can be injected into the exhaust-gas system. The method is distinguished by the fact that an outlet concentration of the at least one exhaust-gas constituent prevailing at an outlet of the first exhaust-gas purification component is calculated by means of an outlet emissions model, and that an inlet concentration of the at least one exhaust-gas constituent prevailing at an inlet of the second exhaust-gas purification component is determined in a manner dependent on the calculated outlet concentration, and that the internal combustion engine is operated in a manner dependent on the thus determined inlet concentration of the at least one exhaust-gas constituent.