Misfiring sensing apparatus for an internal combustion engine

Details Misfiring sensing apparatus for an internal combustion engine Misfiring sensing apparatus for an internal combustion engine

1992-07-16

1993-05-04

Wolfe, Willis R.

Internal-combustion engines

Combustion chamber means combined with air-fuel mixture...

73 35, 73115, F02P 514

Patent

active

052072002

ABSTRACT:
A misfiring sensing apparatus for an internal combustion engine is disclosed, which comprises an ionic current sensing circuit 16 for sensing an ionic current generated upon combustion of fuel in the engine. An ECU 30 determines misfiring in the engine based on the presence or absence of an ionic current in each ignition cycle, and identifies a misfiring cylinder based on a cylinder identifying signal SC from a crank angle sensor 25. It further identifies a failure in the ionic current sensing circuit 16 when an ionic current has not been successively sensed for a predetermined number of ignitions corresponding to the number of the cylinders. Moreover, a plurality of ionic current sensing circuits 16 may be provided one for each cylinder so that at least one output of the ionic current sensing circuits can be used for cylinder identification. This simplifies the crank angle sensor which, in this case, needs not to generate the reference position signal.

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