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:
Aug. 16, 2005
Filed:
Dec. 20, 2000
Martin Hartz, Luebeck, DE;
Manfred Strohrmann, Karlsruhe, DE;
Detlev Straub, Stuttgart, DE;
Christof Hammel, Stuttgart, DE;
Juergen Biester, Boeblingen, DE;
Udo Schulz, Vaihinen/Enz, DE;
Martin Hartz, Luebeck, DE;
Manfred Strohrmann, Karlsruhe, DE;
Detlev Straub, Stuttgart, DE;
Christof Hammel, Stuttgart, DE;
Juergen Biester, Boeblingen, DE;
Udo Schulz, Vaihinen/Enz, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A method for detecting a malfunction of a sensor measuring a measured quantity is provided, in which a signal-range check for the output signal of the sensor is performed, provided that the measured quantity is within a permissible range. If the measured quantity is outside the permissible range, no signal-range check is performed, but the output signal is used for detecting the measured quantity and for further calculations. The sensor may be, for example, a hot-film air-mass meter. If this is the case, the measured quantity is the drawn-in air mass, and the signal-range check is performed, provided that the engine operating state and thus the drawn-in air satisfies specifiable conditions. In addition to the signal-range check, onboard diagnoses with regard to specifiable plausibility criteria relating to the offset-drift and/or the sensitivity-drift of the sensor may also be performed.