| 摘要 |
PURPOSE:To restrain carbon from being built up on a spark plug, by providing a capacitive discharge type first igniter and a voltage transformation type second igniter so that capacitive electric discharge in a short time is used as electric discharge for ignition at the termination of a compression stroke during cold engine operation. CONSTITUTION:An igniter 21 for a discharge type first ignition device and an igniter 22 for a voltage transformation type second ignition device are pro vided in a stage after an ECU 1 which receives detection signals from a rotation al angle sensor 8, a water temperature sensor 9 and an intake-air pressure sensor 11 and calculates an ignition timing and a clean electric discharge timing which satisfy operating conditions. Ignition coils 31, 33; 32, 34 in the first and second ignition devices are set in pairs, and the high voltage side of the ignition coils 31 and 32 or 33 and 34 is connected to a high voltage cord which is con nected in a wired OR pattern. Further, during, for example, cold engine opera tion the second coils 32, 34 effect a long time electric discharge in a suction stroke, and the first coils 31, 32 effect a short time electric discharge at the ignition timing.
|
