| 摘要 |
A fuel injection system includes an injector and a control device. The injector includes a control chamber that drive-controls a needle with a pressure therein. The control device determines a required injection amount in accordance with an operation state of an internal combustion engine, and controls a fuel injection amount injected from the injector through controlling an electric valve therein. The control device determines a geometric shape defined by a time axis and a lift-height change of the needle. The control device further divides the lift-height change of the needle during the period from when the needle starts moving up to when the needle starts moving down into a plurality of portions. The control device then evaluates the lift-height change of the needle in the plurality of portions based on a physical equation.
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