Patent Number: 7,822,537

Title: Detection of faults in an injector arrangement

Abstract: A method of detecting faults in an injector arrangement in an engine. The injector arrangement comprises at least one fuel injector having a piezoelectric actuator, and the method comprises: charging the piezoelectric actuator during a charge phase (t.sub.C); attempting to recharge the piezoelectric actuator during a test phase (t.sub.T) which commences after a time interval (.DELTA.t) following the end of the charge phase (t.sub.C); sensing a current (I.sub.S) that flows through the piezoelectric actuator during the test phase (t.sub.T); and generating a short circuit fault signal if the sensed current (I.sub.S) reaches a first predetermined threshold current (I.sub.SC) which is indicative of a short circuit in the piezoelectric actuator.

Inventors: Perryman; Louisa J. (Rainham, GB), Sykes; Martin A. P. (Rainham, GB), Hopley; Daniel J. (Chislehurst, GB)

Assignee: Delphi Technologies Holding S.arl

International Classification: G06F 19/00 (20060101); F02M 51/00 (20060101)

Expiration Date: 2018-10-26 0:00:00