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:
Jan. 14, 2003
Filed:
Aug. 17, 2000
Ronald Henzinger, Regensburg, DE;
Harald Leiderer, Wörth, DE;
Hermann Leiderer, Wörth, DE;
Andreas Wildgen, Nittendorf, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
It is possible to dispense with a separate ambient pressure sensor. For that purpose, the ambient pressure p is determined from the absolute pressure p in the intake tract of an internal combustion engine, the intake air mass flow rate Q and the air temperature T, as well as a pressure loss coefficient C . Calibration of the value for the ambient pressure p determined in this way when the internal combustion engine is idling or at a standstill makes it possible to diagnose an impermissibly contaminated air filter by deducing from the change in the pressure loss coefficient C .