| 摘要 |
The invention relates to a method for the determining a closing time (tS) of a fuel injector comprising a piezoelectric actuator and a valve needle, wherein in order to close the valve needle of the fuel injector, the piezoelectric actuator is discharged;According to the invention, a variable (U) characterizing an extension of the piezoelectric actuator (110) is measured on said piezoelectric actuator; the discharge is interrupted during a time interval (∆t), before the end of the discharging process; and the closing time (tS) is determined from the variation of the first variable (U) during the time interval (∆t). |
