Engine ignition timing control apparatus
An ignition timing control apparatus is described for an internal combustion engine having a reference ignition timing comprising: a sensing means for sensing vibrations including knocks of the engine; knock signal deriving means for deriving knock signals from the output of the sensing means and indicating a knock condition of the engine; means for initially setting the reference ignition timing in accordance with one of a plurality of modes corresponding to different octane ratings of gasoline fuel used in the engine; an ignition timing change-over determining means for determining from the knock signals derived by the knock signal deriving means whether or not change-over of the reference ignition timing from the initial setting is necessary according to the indicated knock condition and the mode corresponding to the initial setting of the reference ignition timing; an operating condition sensing means; a change-over magnitude determining means for correcting the change-over magnitude of the reference ignition timing according to the operating condition of the engine from the condition sensing means and the output of the ignition timing change-over determining means; and an ignition timing change-over means for changing the reference ignition timing according to the output of the change-over magnitude determining means.
- Assignee:
- Mitsubishi Denki Kabushiki Kaisha
- Patent Number(s):
- US 4635604
- OSTI ID:
- 6816845
- Country of Publication:
- United States
- Language:
- English
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Ignition timing control apparatus for internal combustion engine
Ignition timing control apparatus for internal combustion engine