Ignition device and spark condition detection method

Details Ignition device and spark condition detection method Ignition device and spark condition detection method

2006-04-19

2008-03-25

Hirshfeld, Andrew H. (Department: 2858)

Electricity: measuring and testing

Internal-combustion engine ignition system or device

In situ testing of spark plug

C123S644000

Reexamination Certificate

active

07348782

ABSTRACT:
When a spark discharge is produced, a first current flows in one direction. From a rise of an ignition signal to energize an ignition coil to a fall of the ignition signal to deenergize the ignition coil, in order that a second current flowing in the opposite direction can be detected, the voltage into which the second current has been converted is compared with a first threshold voltage for smolder detection. After the fall of the ignition signal to the rise of the ignition signal, the voltage into which the second current has been converted is compared with a second threshold voltage for misfire detection. The first threshold is set larger than the second threshold.

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