Misfire detector device for use in an internal combustion engine

Details Misfire detector device for use in an internal combustion engine Misfire detector device for use in an internal combustion engine

1993-03-10

1994-09-20

Raevis, Robert

Measuring and testing

Test stand

For engine

324378, G01M 1500

Patent

active

053478550

ABSTRACT:
In a misfire detector device for use in internal combustion engine, an electrical interrupter circuit on-off actuates a primary current flowing through a primary circuit of an ignition coil to induce a sparkplug voltage which is applied to a multi-electrode type spark plug. A check diode or a series gap is provided in a secondary circuit of the ignition coil so as to prevent a current flowing back to the ignition coil. A sparkplug voltage detector circuit detects an attenuation time length of a sparkplug voltage waveform presented subsequent to a predetermined time period after an end of a spark action of the spark plug. On the basis of the attenuation time length, a distinction circuit determines whether a misfire occurs in a cylinder of an internal combustion engine.

REFERENCES:
patent: 2296033 (1941-01-01), Heller
patent: 3942102 (1976-03-01), Kuhn et al.
patent: 5046470 (1991-09-01), Entenmann et al.
patent: 5230240 (1993-07-01), Oshawa et al.

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