Method for controlling an internal combustion engine

US7788018B2 · kind B2 · utility

Assignee

• MTU FRIEDRICHSHAFEN GMBH · DE

Inventors

• Ralf Speetzen · Friedrichshafen, DE
• Gunther Schmidt · Biberach, DE
• Albert Kloos · Friedrichshafen, DE
• Andreas Kunz · Ladenburg, DE
• Michael Willmann · Bermatingen, DE
• Jörge Remele · Hagnau, DE
• Marc Hehle · Konstanz, DE

Key dates

• Filing date: Aug 6, 2008
• Grant date: Aug 31, 2010
• Expiry date: Apr 15, 2029

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 controlling an internal combustion engine having a common rail system together with individual accumulators. A rotational speed-control deviation (dn) is determined from a target rotational speed (nSL) that represents the set point for an outer control loop to control the rotational speed, as well as from an actual rotational speed (nIST). A target torque (MSL) is determined from the rotational speed-control deviation (dn) via a rotational speed controller as a master controller. A target injection duration (SD(SOLL)) is determined from the target torque (MSL). The target duration injection (SD(SOLL)) represents the set point for an inner control loop for controlling cylinder-specific injection duration. An injection duration deviation is determined from the target injection duration (SD(SOLL)) and from an actual injection duration. A correcting variable is determined from the injection duration deviation via an injection duration controller as a follow-up controller, and an injection duration is determined from the correcting variable and the target injection duration for activating the injectors.