System for engine retard limit control

Details System for engine retard limit control System for engine retard limit control

2005-10-18

2005-10-18

Huynh, Hai (Department: 3747)

Internal-combustion engines

Spark ignition timing control

Electronic control

C123S406430

Reexamination Certificate

active

06955157

ABSTRACT:
The present invention provides a system and method for controlling the retard limit of an engine having one or more cylinders in which combustion occurs. A sensor is employed to detect the ionization of the combustion process in the cylinders. The ionization is related to a retard limit feedback, and the sensor further transmits a signal associated with the retard limit feedback. A controller relates the retard limit feedback signal to a metric, monitors the stochastic behavior of the metric, and adjusts the ignition timing of the engine in response to the stochastic behavior to operate the engine below a retard limit target.

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