| 摘要 |
<p>A method of operating a fuel injector (2) having a piezoelectric actuator (20) for controlling movement of an injector valve needle (10) comprises: (a) prior to an initial fuel injection event, reducing the voltage across the actuator at an initial rate (RT0;RT0') so as to de-energise the actuator; (b) increasing the voltage across the actuator at a first rate (RT1) in order to initiate an initial fuel injection event (110;120;130); (c) reducing the voltage across the actuator at a second rate (RT2) in order to terminate the initial fuel injection event; (d) increasing the voltage across the actuator at a third rate (RT3;RT3'), so as to de-energise the actuator without initiating an injection event.</p> |
