Engine event-based correction of engine speed fluctuations

Internal-combustion engines – Spark ignition timing control – Electronic control

Reexamination Certificate

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C123S406500, C701S111000

Reexamination Certificate

active

07658178

ABSTRACT:
Ignition timing for a combustion engine may be controlled by determining the roughness of current engine operation, comparing the determined roughness with a control roughness to determine if the determined roughness is within a threshold limit of the control roughness, and changing the ignition timing in a subsequent fuel delivery event as a function of the difference between the determined roughness and the control roughness. Preferably, the ignition timing is changed at least when the determined roughness is not within the threshold limit, although other factors may be taken into account when changing the ignition timing.

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