Method of detecting engine speed for detecting misfires in an internal combustion engine

US5822710A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Manfred Mezger · Markgröningen, DE
• Klaus Ries-Muller · Bad Rappenau, DE
• Rainer Frank · Sachsenheim, DE
• Christian Kohler · Dresden, DE

Key dates

• Filing date: Jun 10, 1996
• Grant date: Oct 13, 1998
• Expiry date: Jun 10, 2016

Classification

• Technology area (CPC G): Physics
• CPC primary: G01M15/11
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The invention is directed to a method for detecting combustion misfires in a multicylinder internal combustion engine. The method includes the steps of: forming a criterion for the rough running of the engine for each cylinder individually on the basis of time intervals during which the crankshaft passes through predetermined angular ranges; and, forming corrective values from rough-running values for each cylinder individually during misfire-free operation so that the rough-running values for each individual cylinder coupled to said corrective values become equal with respect to each other.