Method of detecting combustion misfires by evaluating RPM fluctuations

US5875411A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Asmus Volkart · Bietigheim-Bissingen, DE
• Klaus Ries-Muller · Bad Rappenau, DE
• Sigrid Hafner · Stuttgart, DE
• Jurgen Forster · Tegernheim, DE
• Wolfgang Wimmer · Rietheim, CH
• Andrea Lohmann · Forstau, AT

Key dates

• Filing date: May 21, 1997
• Grant date: Feb 23, 1999
• Expiry date: May 21, 2017

Classification

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

Abstract

A method is introduced for detecting combustion misfires on the basis of the time-dependent course of the rotational movement of a transducer wheel, which is coupled to the crankshaft of an internal combustion engine. In this method, the segment times, in which predetermined segments of the transducer wheel pass a sensor, are detected and processed to a measure for the rough running of the internal combustion engine. A conclusion as to misfires is drawn from the behavior of the measure. The measure for the rough running is formed by digital filtering of segment times with predetermined filter coefficients.