Patent ID: 6584834
Filing Date: 2003-07-01
Classification: F02D,G01M

Abstract:
A method for detecting combustion misfires in an internal combustion engine wherein an index for the rough running of the engine is formed and is compared to a threshold value which is dependent upon the load of the engine and wherein exceeding the threshold value is evaluated as a misfire and the detection of combustion misfires can be activated or deactivated, the method comprising the step of providing at least one of the following:(a) that, in addition to the dependency upon the load, the threshold value is also dependent upon at least one of the ignition angle and the composition of the air/fuel mixture of the engine; (b) that the formation of the index for the rough running also takes place in dependence upon at least one of the ignition angle and the composition of the air/fuel mixture of the engine; and, (c) that whether the misfire detection is activated or deactivated is at least dependent upon at least one of the ignition angle and the composition of the air/fuel mixture of the engine.