| 摘要 |
A spark advance control system includes a high octane value spark advance schedule and a regular octane value spark advance schedule, respectively including advance limits and retard limits at different spark advance angles. Spark advance control schedules are selected during normal spark advance control operation. The high octane value spark advance schedule is selected when spark advance is maintained at an angular value higher than a predetermined regular-to-high octane value schedule switching, which is set near an advance limit in the regular octane value spark advance schedule. In the alternative, the regular octane value spark advance schedule is selected when spark advance is maintained at an angular value lower than a predetermined high-to-regular octane value schedule switching criterion, which is set near the retard limit in the high octane value spark advance schedule. The spark advance control schedule selection set forth above successfully avoids uncomfortably rapid and substantial changes of engine output characteristics, even when the gasoline type is changed.
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