Device of estimating heat resistivity for a spark plug and a met

Details Device of estimating heat resistivity for a spark plug and a met Device of estimating heat resistivity for a spark plug and a met

1995-03-20

1996-05-28

Wieder, Kenneth A.

Electricity: measuring and testing

Internal-combustion engine ignition system or device

In situ testing of spark plug

324391, 324399, F02P 1700, G01M 1902

Patent

active

055215092

ABSTRACT:
In a device of estimating heat resistivity for a spark plug, an ignition spark control circuit is provided to discontinue ignition spark across electrodes of a spark plug at a predetermined intervals. A counter circuit is provided to count the times of the ignition spark suppressed by the ignition spark control circuit. A self-ignition detection circuit is provided to detect the self-ignition from the spark plug when the ignition spark is suppressed by the ignition spark control circuit. A self-ignition counter circuit is provided to count the numbers of the self-ignition detected by the self-ignition detection circuit. A calculation circuit is provided to calculate occurrences rate of the self-ignition from the spark plug on the basis of the suppressing numbers of the ignition spark counted by the counter circuit and the detecting numbers of the self-ignition counted by self-ignition counter circuit. A self-ignition timing detection circuit is provided to detect a detection timing of the self-ignition detected by the self-ignition detection circuit. A preignition timing anticipating circuit is provide to anticipate an ignition timing when preignition of the internal combustion engine occurs on the basis of the occurrence rate of the self-ignition detected by the calculation circuit and detecting timing of the self-ignition detected by the self-ignition timing detection circuit.

REFERENCES:
patent: 4716874 (1988-01-01), Hilliard et al.
patent: 4987771 (1991-01-01), Iwata
patent: 5206809 (1993-04-01), Iwakiri et al.
patent: 5311765 (1994-05-01), Iwakiri
Classification and Selection of the Heat Ranges of Spark Plugs for Internal-Combustion Engines, Otto Beesch, pp. 1-5, Jan. 26, 1972.

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