| 摘要 |
<p>PURPOSE:To prevent any wrong ignition by providing a high voltage diode for applying no secondary voltage to an ignition plug, at the time of closing of a power transistor of the ignition coil, on the middle of the secondary coil winding. CONSTITUTION:A control unit 18 receives an electric signal 20 generated in synchronization with rotation of an internal combustion engine from a crank angle sensor 19 so as to allocate the signal to each of ignition coils. For example, when each of ignition coils receives an electric signal 21, the signal is led to a power transistor 10, so that current 22 flows through the primary coil 2. When the power transistor 10 is opened, the secondary high voltage is generated in its secondary coil 4 and applied to an ignition plug 8. on the other hand, the secondary voltage is generated in the secondary coil 4 also at the time of closing the power transistor 10. But the secondary voltage is not applied to the ignition plug 8 because a high voltage diode 9 is arranged. Because the high voltage diode 9 is arranged in the secondary coil winding 4, a necessary air gap can be secured without enlarging an ignition mechanism, so that it is possible to prevent any wrong ignition from being generated by the wrong secondary voltage.</p> |
