Ignition coil dwell time control system

Details Ignition coil dwell time control system Ignition coil dwell time control system

1997-09-19

1999-06-22

Kwon, John

Internal-combustion engines

High tension ignition system

Having dwell control

F02P 900

Patent

active

059133023

ABSTRACT:
A two-stroke direct fuel injected internal combustion engine has an ignition coil dwell time control system. An electronic control unit controls switching of electronic ignition coil drivers in a manner to minimize ignition coil dwell times at medium and high engine speeds where low ignition coil dwell times can be used without sacrificing engine performance. The electronic control unit also implements an intermittent spark plug cleaning strategy to remove carbon deposits from fouled spark plugs. Intermittent cleaning is accomplished during engine operation by periodically raising the ignition coil dwell time to an exaggerated cleaning level for a relatively short period of time (e.g. one minute) after it is determined the spark plug cleaning should occur (e.g. 10 to 20 engine operating hours since previous cleaning).

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Battery ignition, pp. 100-103 and 122-127.
Spark Plug Fouling: A Quick Engine Test, Ather A. Quader et al., SAE Paper 920006, Feb. 2-6, 1992.

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