| 摘要 |
PROBLEM TO BE SOLVED: To improve ignitability to a mixture and to prevent a misfire caused by the fouling of a plug by switching-driving a switching element continuously a plurality of times to generate spark discharge to a spark plug continuously a plurality of times at the combustion timing of one combusiton cycle of an internal combustion engine. SOLUTION: At the time of operating an engine, a control signal generated by an ECU so as to generate spark discharge to a spark plug 13 continuously a plurality of times is impressed to a transistor 17 which is a switching element, to switch-drive it. With the 'on' operation of the transistor 17, a primary current flows to a primary coil of an ignition coil, and the primary current is cut off by the succeeding 'off' operation. High voltage is thereby generated to a secondary coil of the ignition coil to generate spark discharge at the spark plug 13. Such operations are repeated a plurality of times, and multiple discharge is generated by recarrying the primary current before the natural termination of spark discharge. A mixture is thereby ignited positively.
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