Exhaust-gas-turbocharged internal combustion engine having at least two turbines and switchable outlet openings, and method for operating an internal combustion engine of said type

US9896991B2 · kind B2 · utility

Assignee

• Ford Global Technologies, LLC · US

Inventors

• Vanco Smiljanovski · Bedburg, DE
• Helmut Matthias Kindl · Aachen, DE
• Joerg Kemmerling · Monschau, DE
• Franz J. Brinkmann · Hürth, DE
• Franz Arnd Sommerhoff · Aachen, DE

Key dates

• Filing date: Mar 17, 2016
• Grant date: Feb 20, 2018
• Expiry date: May 25, 2036

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

Systems and methods are provided for controlling boost pressure in an engine system with a parallel turbocharger. One example method includes, responsive to a first condition, deactivating a first compressor of a first turbocharger, activating each first exhaust valve of each cylinder of an engine, and deactivating each second exhaust valve of each cylinder of the engine to flow exhaust gas from the engine to a second turbocharger. The method further includes, responsive to boost pressure exceeding a threshold, maintaining deactivation of the first compressor, reactivating each second exhaust valve to flow exhaust gas from the engine to both the first turbocharger and second turbocharger, and driving an electric assist device via a first turbine of the first turbocharger.