Method for identifying misfire in internal combustion engines

US5377536A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Anton Angermaier · Landshut, DE
• Thomas Vogt · Regensburg, DE
• Manfred Wier · Wenzenbach, DE

Key dates

• Filing date: Aug 16, 1993
• Grant date: Jan 3, 1995
• Expiry date: Aug 16, 2013

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02P17/00
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for identifying misfiring is employed in an internal combustion engine with multiple cylinders. The identification is effected by measuring segment times required for the crankshaft to rotate about given angular segments during the cylinder work cycle. Any fluctuations are then calculated and compared with threshold values. During thrust cutoff, i.e. when no fuel is supplied to the cylinders, errors in the segment time measurement are identified and corrected, and in dependence of the number of the completed cycles for calculating the correction factors, the threshold values are modified.