The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 19, 2005
Filed:
Jan. 24, 2001
Michael Lehner, Muehlacker, DE;
Heiko Oertel, Stuttgart-Weilimdorf, DE;
Klaus Ries-mueller, Bad Rappenau, DE;
Michael Lehner, Muehlacker, DE;
Heiko Oertel, Stuttgart-Weilimdorf, DE;
Klaus Ries-Mueller, Bad Rappenau, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The invention relates to a method for detecting combustion misfires in multi-cylinder internal combustion engines having several simultaneously igniting cylinders wherein, for each crankshaft rotation, rough running values are determined by measuring segment times, the segment times including the times, which correspond to the piston movement of individual cylinders after their ignition time point, wherein the crankshaft passes through an associated circular segment angular region. A combustion misfire is determined in the affected crankshaft circular segment regions from the determined rough running values LUT for crankshaft segment regions having several simultaneously igniting cylinders via a desired value comparison to a threshold value SW, which is lower in value than the threshold value SWfor the misfire check in crankshaft segment regions having individually igniting cylinders. For a combustion misfire in a crankshaft segment region having simultaneously igniting cylinders causing a misfire operation in one of these cylinders, a misfire operation is caused by a suitable engine intervention and by measuring the change of the rough running values in the crankshaft segment region having the simultaneously igniting cylinders, the cylinder is determined by the engine intervention which exhibits a combustion misfire without engine intervention.