Ignition point in time control manner and ignition point in time control unit of ignition device for internal combustion engine.

摘要

PROBLEM TO BE SOLVED: To enable accurate and stable rotation speed measurement and provide more efficient combustion action even if variation of voltage of the ignition coil exist by detecting rotation speed from generated voltage cycle of primary winding wire of an ignition coil and setting a timer for ignition timing suitable for rotation speed.;SOLUTION: Voltage wave including at least three continuous voltage portions is obtained by full-wave rectification of induced voltage of the primary winding wire 25 of the ignition coil 24, ignition action by a second voltage portion d2 is performed at rotation speed of predetermined advance rotation speed n or less and ignition action by a first voltage portion d1 which rises before the second voltage portion is performed when rotation speed reaches the advance rotation speed n to surely obtain great advance angle.;COPYRIGHT: (C)2006,JPO&NCIPI