To determine whether or not the amount of speed reduction of engine revolution is equal to or greater than a predetermined amount with a simple structure and inhibit shock on a variety of components due to a reverse revolution of an engine with an inexpensive structure.
An ignition control device includes a revolution speed detection means, a revolution speed reduction detection means, and an ignition prevention means. The revolution speed detection means is configured to detect a revolution speed at a given timing in a revolution of the engine. The revolution speed reduction detection means is configured to detect the amount of speed reduction from a previous engine revolution to a present engine revolution based on the detection of the revolution speed detection means. The present engine revolution is defined as an engine revolution in which an ignition is executed. On the other hand, the previous engine revolution is defined as an immediately previous engine revolution from the present engine revolution. The ignition prevention means is configured to prevent the ignition in the present engine revolution when the amount of speed reduction detected by the revolution speed reduction detection means is greater than a predetermined amount.
KIDERA HIROYUKI
Yukio Ono
Yamashita