| 摘要 |
PROBLEM TO BE SOLVED: To provide an ion current detection device, capable of securing determination time from around 15 degrees of ATDC, and securing the maximum ignition energy over a wide speed range to a system for controlling the ignition timing and the air-fuel ratio by finely collecting ion current variation information from starting to reaching a high speed range. SOLUTION: In the middle of a primary winding provided with a power source on one terminal of an ignition coil, at least one tap terminal is provided, and a switching element is provided on each of the tap terminal of the primary winding and the other terminal. An ignition plug and an ion current detecting device are provided on the secondary winding of the ignition coil, and action of the switching element is switched in accordance with the speed of an internal combustion engine. COPYRIGHT: (C)2007,JPO&INPIT
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