Method for determining injection duration of piezoelectric actuator of piezo injector, involves changing parameter if predetermined duration lies outside desired window duration such that new duration lies within desired window duration

摘要

The method involves determining a desired injection window duration for a momentary operating point, and determining injection duration for the momentary operating point required for injecting a desired fuel amount. A determination is made whether a predetermined injection duration lies within the desired window duration. A parameter influencing the required injection duration is changed if the predetermined duration lies outside the desired window duration such that new injection duration lies within the desired window duration, where the parameter is injection pressure or rail pressure. An independent claim is also included for a computing unit for determining injection duration of a piezoelectric actuator of a piezo injector.