| 摘要 |
<p>The invention relates to an engine generating two or more ignition sparks by the same spark plug (1), which can avoid a torque reduction caused by misfire of main ignition (8b), can start firing and burning at proper timing depending on operating conditions, and can reduce misfires. A novel controller and a novel ignition coil (11) adapted for realizing that engine are also provided. One spark plug (1) and at least one ignition coil are provided per cylinder. When performing a plurality of ignitions during the compression stroke in the cylinder, before main ignition to start firing and burning at proper timing depending on operating conditions of the engine, preliminary pre-ignition is performed to form a fire seed (8a) around the spark plug (1). The main ignition (8b) is then performed to cause main burning. Misfire is avoided, appropriate torque can be generated, and combustion stability can be improved.
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