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:
Nov. 03, 2009
Filed:
Oct. 19, 2007
Martin Bucher, Bermatingen, DE;
Armin Dölker, Friedrichshafen, DE;
Volker Wachter, Mengen, DE;
Uwe Kosiedowski, Owingen, DE;
Martin Bucher, Bermatingen, DE;
Armin Dölker, Friedrichshafen, DE;
Volker Wachter, Mengen, DE;
Uwe Kosiedowski, Owingen, DE;
MTU Friedrichshafen, Friedrichshafen, DE;
Abstract
A method for detecting the opening of a passive pressure control valve, which conducts fuel from a common rail system back to a fuel tank, in which the rail pressure (pCR) is automatically controlled by calculating a correcting variable for acting on the controlled system from a rail pressure control deviation via a pressure controller, and in which, starting from a steady-state rail pressure in normal operation, a load reduction is detected when the rail pressure exceeds a first limit. Opening of the pressure control valve is detected after the first limit is exceeded if a steady-state operating state is subsequently detected again, and if a characteristic of the closed-loop control system deviates significantly from a reference value.