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:
Dec. 18, 2012
Filed:
Jun. 11, 2008
Carlos Eduardo Migueis, Tegernheim, DE;
Michael Stahl, Bogen, DE;
Matthias Wiese, Aschaffenburg, DE;
Carlos Eduardo Migueis, Tegernheim, DE;
Michael Stahl, Bogen, DE;
Matthias Wiese, Aschaffenburg, DE;
Continental Automotive GmbH, Hannover, DE;
Abstract
In a method for diagnosing an injection valve (), in an overrun fuel cut-off phase the fuel supply to the fuel rail () is closed, and after the fuel supply has been closed off a first fuel pressure in the fuel rail () is measured, and after the first measurement of the fuel pressure an injection valve () is actuated for a test injection. After the test injection a second fuel pressure in the fuel rail () is measured, a differential pressure value (ΔP) is formed from the first and second measured fuel pressures and a difference of an operating parameter from a reference parameter is determined from the differential pressure value (ΔP), and when a previously defined maximum difference is exceeded the injection valve () is detected as being defective.