METHOD FOR DETERMINING THE IDLE TRAVEL OF A PIEZO-INJECTOR WITH A DIRECTLY ACTUATED NOZZLE NEEDLE

摘要

The invention relates to a method for determining the idle travel of a piezo-injector which has a piezo-actuator and a nozzle needle which is activated directly by the piezo-actuator. A test pulse is applied to the piezo-actuator, which pulse brings about a continuous increase in the piezo-travel. The time period is measured which passes between the starting of the test pulse and the time when the idle travel is overcome. The idle travel of the piezo-injector is determined from the measured time period.