The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 26, 2010
Filed:
Nov. 28, 2007
Louisa J. Perryman, Rainham, GB;
Martin A. P. Sykes, Rainham, GB;
Daniel J. Hopley, Chislehurst, GB;
Louisa J. Perryman, Rainham, GB;
Martin A. P. Sykes, Rainham, GB;
Daniel J. Hopley, Chislehurst, GB;
Delphi Technologies Holding S.arl, Troy, MI (US);
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); attempting to recharge the piezoelectric actuator during a test phase (t) which commences after a time interval (Δt) following the end of the charge phase (t); sensing a current (I) that flows through the piezoelectric actuator during the test phase (t); and generating a short circuit fault signal if the sensed current (I) reaches a first predetermined threshold current (I) which is indicative of a short circuit in the piezoelectric actuator.