| 摘要 |
A method for controlling a piezoelectric injector 1 where the injector comprises an injection needle 2 operated by a piezoelectric actuator 3 and a charge current profile is applied to the piezoelectric actuator, the method comprises choosing an electric parameter expressive of an energy, which is transferable to the actuator, choosing for each injection cycle a setpoint value of the electric parameter, which is expressive of the energy that should be transferred to the actuator, monitoring the value of the current flowing through the piezoelectric actuator during an injection cycle, calculating a value of the electric parameter, determining the difference between the electric parameter setpoint value and the electric parameter value expressive of the energy transferred to the actuator, using the difference between them to generate a correction index to be applied to the current profile in order to minimize said difference, in the same injection cycle. The method may be repeated a plurality of times during the same injection cycle and the electric parameter expressive of the energy may be the charge or energy. |
