Internal-combustion engines – Spark ignition timing control – Electronic control
Reexamination Certificate
2005-02-01
2009-12-01
Cronin, Stephen K (Department: 3747)
Internal-combustion engines
Spark ignition timing control
Electronic control
C073S035080
Reexamination Certificate
active
07624718
ABSTRACT:
An engine control system enables engine control to cause ignition timing to approximate MBT without necessarily measuring torque and combustion pressure. The negative ion current in an engine combustion chamber is measured and a first crank angle B corresponding to a first rate in change of the negative ion current curve E is identified. A second crank angle C corresponding to a second rate in change of the negative ion current curve E also is identified. The ignition timing is controlled based upon a third crank angle G that generally is a midpoint between the first crank angle B and the second crank angle C. The third crank angle G becomes a specified target crank angle.
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Cronin Stephen K
Keating & Bennett LLP
Vilakazi Sizo B
Yamaha Hatsudoki Kabushiki Kaisha
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