Measuring and testing – Vehicle chassis – Steering
Reexamination Certificate
2005-07-19
2005-07-19
Cuneo, Kamand (Department: 2829)
Measuring and testing
Vehicle chassis
Steering
C073S117020
Reexamination Certificate
active
06918288
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 SW2, which is lower in value than the threshold value SW1for 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.
REFERENCES:
patent: 5747679 (1998-05-01), Dietz et al.
patent: 6457455 (2002-10-01), Baeuerle et al.
patent: 41 38 765 (1992-07-01), None
Lehner Michael
Oertel Heiko
Ries-Mueller Klaus
Cuneo Kamand
Harrison Monica D.
Ottesen Walter
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