| 摘要 |
In an electromagnetic fuel injector, when an opening valve pulse is turned ON by a command from an ECU, a first coil is energized and a first fixed core attracts a moving core and unseats a valve member from a valve seat to open a valve of the fuel injector. A time Tx before the opening valve pulse becomes OFF, a closing valve pulse is turned ON, whereby a second coil is energized and a second fixed core attracts the moving core toward a valve closing direction. As a result, after the valve starts to close, the urging force in the valve closing direction increases rapidly, the time delay from the start of valve closing to the end is shortened, and the valve closing responsiveness improves.
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