Apparatus for and a method of detecting combustion in an interna

Details Apparatus for and a method of detecting combustion in an interna Apparatus for and a method of detecting combustion in an interna

1992-01-29

1992-09-15

Nelli, Raymond A.

Internal-combustion engines

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

123494, F02P 514

Patent

active

051468930

ABSTRACT:
An apparatus for detecting combustion in an internal combustion engine which comprises: a plurality of cylinders wherein an ignition control is performed being synchronized with a revolution number of the internal combustion engine; and an ionic current detector installed at an ignition plug of at least one cylinder of the plurality of cylinders; said ionic currrent detector including means for generating a voltage which corresponds to a level of an ionic current generated by the ignition plug, means for generating a threshold value which is a combustion determining standard, and a comparator which generates an output signal that shows a combustion state, by comparing the voltage with the threshold value; said means for generating a threshold value is composed of a threshold level variable circuit which generates a threshold value corresponding to a running condition of the engine. And a method of detecting combustion in an internal combustion engine having the above cylinders, the ionic current detector and the ECU, which comprises step of: calculation an ionic detect time during between the detection of an edge of an ignition signal and an edge of the next ignition signal, of the cylinder; and determinig a combustion state by comparing the ionic detect time which a predetermined value, by the ECU.

REFERENCES:
patent: 1998405 (1935-04-01), Fernandez
patent: 2339713 (1944-01-01), McCarthy
patent: 4991553 (1991-02-01), Kurihara et al.
patent: 4993387 (1991-02-01), Sakakihara et al.
patent: 5087882 (1992-02-01), Iwata

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