Ignition Circuit Using Crankshaft Speed Drop for Early Acceleration

The control circuit performs preliminary detection of acceleration by monitoring the drop in rotational speed during the compression stroke (before TDC) in advance. When a significant drop is detected, the control circuit proactively switches to advanced ignition time for the next combustion cycle, rather than waiting for rotational speed to confirm acceleration has already occurred. This preliminary detection and advance switching resolves the contradiction by detecting acceleration intent early while maintaining reliable detection through the compression stroke monitoring.

The control circuit uses feedback from monitoring the actual rotational speed behavior during the compression stroke to verify acceleration intent. Instead of relying solely on throttle position or predetermined timing, the system continuously monitors the drop in rotational speed during compression and uses this real-time feedback to confirm when acceleration is actually occurring. This feedback mechanism ensures accurate detection of the acceleration state while enabling rapid response through timely ignition timing adjustment.

The control circuit segments the crankshaft rotation cycle into distinct phases and focuses monitoring specifically on the compression stroke (from bottom dead center to top dead center). By dividing the monitoring task to concentrate only on the relevant compression phase rather than the entire 360-degree cycle, the system achieves reliable detection of acceleration intent while minimizing control circuit complexity. This segmented approach identifies the critical period where acceleration signals are most evident without requiring continuous full-cycle monitoring.