Method and device for determining a signal offset between a crankshaft angle signal and a combustion chamber pressure signal in an internal combustion engine

US10012156B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Martin Rauscher · Ludwigsburg, DE
• Andreas Roth · Karlsruhe, DE
• Raffael Hedinger · Bellinzona, CH
• Wolfgang Fischer · Eppelheim, DE
• David Gaenzle · Echterdingen, DE
• Christopher Onder · Weisslingen, CH

Key dates

• Filing date: Feb 23, 2016
• Grant date: Jul 3, 2018
• Expiry date: Sep 18, 2036

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D41/2432
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method for determining a signal offset between a crankshaft angle signal and a combustion chamber pressure signal includes: measuring the combustion chamber pressure signal; shifting an alignment of the measured combustion chamber pressure signal with respect to the crankshaft angle signal by a plurality of respective offset angles to generate a plurality of offset combustion chamber pressure signals; reconstructing the offset combustion chamber pressure signals using a plurality of predetermined inherent pressure curves to generate reconstructed combustion chamber pressure signals; determining reconstruction errors of the reconstructed combustion chamber pressure signals as a function of differences between the offset combustion chamber pressure signals and the reconstructed combustion chamber pressure signals; and determining the signal offset between the crankshaft angle signal and the combustion chamber pressure signal as a one of the plurality of offset angles producing the reconstruction error having the lowest value.