Method of detecting combustion misfires
AssigneeRobert Bosch GmbH
InventorsHelmut Janetzke, Gunther Kossler, Peter Stoss
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Abstract
The invention is directed to a method for detecting combustion misfires in a multi-cylinder internal combustion engine, the method comprising the steps of: determining the rough-running values for the engine individual to the cylinders; determining a quantity for the level of a subset of the rough-running values; forming a reference value by logically coupling the quantity with an offset; and, comparing the rough-running values to the reference value and evaluating a passthrough of the reference value as a misfire.
Claims10
A method for detecting combustion misfires in a multi-cylinder internal combustion engine utilizing rough-running values, the method comprising the steps of:
- determining the rough-running values for the engine individual to the cylinders;
- determining a quantity as a mean value (luapm) of positive rough-running values for each of said cylinders and/or a mean value (luanm) of negative rough-running values over a revolution or the camshaft of said engine;
- forming a reference value by logically coupling said quantity with an offset;
- and,
- comparing said rough-running values to said reference value and evaluating a passthrough of said reference value as a misfire.
A method for detecting combustion misfires in a multi-cylinder internal combustion engine utilizing rough-running values, the method comprising the steps of:
- determining the rough-running values for the engine individual to the cylinders;
- forming a mean value of the rough-running values of the individual cylinders;
- selecting a minimum (luamn) of said mean value;
- defining said minimum (luamn) as a quantity for a level of a subset of said rough-running values individual to the cylinders;
- forming a reference value by logically coupling said quantity with an offset;
- and,
- comparing said rough-running values to said reference value and evaluating a passthrough of said reference value as a misfire.
A method for detecting combustion misfires in a multi-cylinder internal combustion engine utilizing rough-running values, the method comprising the steps of:
- determining the rough-running values for the engine individual to the cylinders with and without misfires;
- the rough-running values of cylinders without misfires and the rough-running values of cylinders with misfires are plotted as a function of time in respective bands;
- using a variable as a quantity for a level of a subset of said rough-running values;
- said variable reflecting a trace of one or both of said bands of rough-running values;
- forming a reference value by logically coupling said quantity with an offset;
- and,
- comparing said rough-running values to said reference value and evaluating a passthrough of said reference value as a misfire.
Dependencies are inferred from the claim text.