Internal combustion engine ignition method

摘要

In order to improve the cold starting efficiency of a an internal combustion engines using alcohol or low cetane type fuel, an ignition method provides an ignition mode in which a plurality of energizations of the ignition plugs per cycle is effected during engine cold starting operation which is detected by sensing at least one of the engine temperature and the engine speed. The number of energizations per cycle is returned to one after the engine has sufficiently warmed up. The method is applied to both of a plasma ignition system and a conventional spark ignition system.