- METHOD FOR DETERMINING THE VALVE OPENING MOMENT IN PIEZO SERVO-DRIVEN INJECTORS

摘要

The present invention relates to a method for determining a valve opening moment in a piezoelectric servo-driven injector using a piezoelectric actuator as a sensor element. At the end of the charging operation of the piezoelectric actuator, a voltage and an amount of charge are measured, and a temporary scaling coefficient is identified based on the measurement. In this way, an approximation of the valve opening moment is obtained, at which point the voltage and the charge are again measured. A new scaling factor is determined by a corresponding calculation operation. Finally, the valve opening moment is determined with the aid of the new scaling factor. This moment can be determined online.;