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:
Jun. 07, 2005
Filed:
Oct. 07, 2000
Thomas Frenz, Noerdlingen, DE;
Hansjoerg Bochum, Novi, MI (US);
Thomas Frenz, Noerdlingen, DE;
Hansjoerg Bochum, Novi, MI (US);
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The invention relates to a method and an arrangement for diagnosing a fuel supply system of an internal combustion engine. In order to make possible a differentiation of the fault with respect to individual components of the fuel supply system, a method is suggested which is characterized by the following steps: recording the trace of the fuel pressure in the fuel supply system (); forming the frequency spectrum of the fuel supply trace (); and, analyzing the frequency spectrum (). The analysis of the frequency spectrum preferably includes the following steps: comparing the trace of the recorded frequency spectrum to the trace of the frequency spectrum of a fault-free operating fuel supply system at this operating point; and, in the event that deviations between the traces of the frequency spectra are present, classifying the deviations in accordance with the nature of the faults in the fuel supply system via which the deviations are caused.