| 摘要 |
PURPOSE:To rapidly retard the ignition timing at least at an optional rotational speed of a device, by generating pulses for a certain length of time in the method of a signal generated at an earlier period than a firing signal of an ignition signal generator and permitting said pulses to partially mask the firing signal. CONSTITUTION:To an ignition signal generator 1 a switching device 3 is connected through a trigger signal generator 2 to allow said device 3 to interrupt an input to the primary winding of an ignition coil 4. Further a signal generator 5 that generates a signal at an advanced period before a firing signal of the ignition signal generator 1 is provided, and a pulse generator 6 connected to the switching device 3 is connected to said generator 5. Said pulse generator 6 is driven by the signal of the signal generator 5 and constituted in such a manner that a pulse is generated for a certain length of time and applied to the switching device 3 to make a masking partially of the firing signal at least at a preset rotational speed No. In this way, a speed characteristic as shown in the graph can be obtained. |
