Method for determining the rotation angle position of the camshaft of a reciprocating-piston engine in relation to the crankshaft

US7254991B2 · kind B2 · utility

Assignee

• Schaeffler KG · DE

Inventors

• Holger Stork · Bühl, DE
• Heiko Dell · Bühl, DE
• Minh Nam Nguyen · Laufenburg (Baden), DE

Key dates

• Filing date: Aug 26, 2005
• Grant date: Aug 14, 2007
• Expiry date: Feb 11, 2026

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49105
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In a method for adjusting the rotation angle position of the camshaft of a reciprocating-piston engine in relation to the crankshaft in which the crankshaft is in drive connection with the camshaft via an actuating gear, which is designed as a three-shaft gear having a drive shaft in a fixed mounting on the crankshaft, an output shaft in a fixed mounting on the camshaft and an actuating shaft which is in drive connection with an actuating motor, a measured value for the crankshaft rotation angle is determined for at least one crankshaft measurement point in time. For at least two actuating shaft measurement points in time, a measured value for the actuating shaft rotation angle is determined digitally. For at least one reference point in time which is after the crankshaft measurement point in time and the actuating shaft measurement point in time, an estimate for the rotation angle of the actuating shaft at the reference point in time is extrapolated from at least two actuating shaft rotation angle measured values, the time difference between the actuating shaft measurement points in time and the time interval between the latest actuating shaft measurement point in time and the ref…