Method and control device for operating an internal combustion engine

US9915193B2 · kind B2 · utility

Assignee

• Dr. Ing. h.c. F. Porsche AG · DE

Inventors

• Andre F. Casal Kulzer · Eppelheim, DE
• Thorben Walder · Stuttgart, DE
• Ludwig Theilemann · Fischbachau, DE
• Michael Reinhardt · Mannheim, DE
• Michael Ebert · New York, US

Key dates

• Filing date: Nov 9, 2015
• Grant date: Mar 13, 2018
• Expiry date: Feb 28, 2036

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 (10) that has at least one cylinder row (11a, 11b) with first and second exhaust-gas turbochargers (13a, 13b; 14a, 14b). Charge air is provided by the first exhaust-gas turbocharger (13a, 13b) in single-charger operation, but is provided by the first and second exhaust-gas turbocharger (13a, 13b; 14a, 14b) in two-charger operation. To switch from single-charger to two-charger operation above a load threshold value of the internal combustion engine (10), when a speed of the internal combustion engine (10) reaches or overshoots a threshold value, a charge pressure is increased to build up a torque reserve and a charge pressure reserve and to maintain a driver demand torque. When the charge pressure reaches or overshoots a threshold value, a switch is made from single-charger operation to two-charger operation, and subsequently, the torque reserve and the charge pressure reserve are eliminated.