Process and device for electronically controlling actuators of a combustion engine with variable gas exchange control

US6671610B2 · kind B2 · utility

Assignee

• Bayerische Motoren Werke Aktiengesellschaft · DE

Inventors

• Gert Rekewitz · Holzkirchen, DE
• Gerd Kraemer · Kohlhof, DE
• Georg Meder · Munich, DE
• Tim Beattie · Nesbitt, GB

Key dates

• Filing date: Apr 30, 2001
• Grant date: Dec 30, 2003
• Expiry date: Feb 10, 2022

Classification

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

Abstract

In a process and a device for electronically controlling actuators of a combustion engine with variable gas exchange control using a suction pipe pressure model where the connection between the cylinder filling level and the suction pipe pressure is described by a straight line with gradient and offset, the gradient and/or offset are determined as a function of the valve overlap surface. Preferably, the gradient and/or the offset are also determined as a function of the position of the valve overlap surface. The position of the valve overlap surface can be determined by the interval between the center of gravity of the valve overlap surface and a reference crankshaft angle. This improves the control of a combustion engine in motor vehicles with a gas exchange control (for example, with variable cam shaft rotation and/or cam shaft switchover to phaseless change of the valve control time and/or the valve stroke) with a view to accuracy and flexibility.