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:
Sep. 18, 2007
Filed:
Jul. 12, 2006
Eberhard Schnaibel, Hemmingen, DE;
Kersten Wehmeier, Ludwigsburg, DE;
Eberhard Schnaibel, Hemmingen, DE;
Kersten Wehmeier, Ludwigsburg, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A method for the dynamic diagnosis of an exhaust gas analyzer probe situated in an exhaust-gas system having at least one exhaust-gas catalytic converter, of an internal combustion engine, a measuring signal (lambda-actual) of the exhaust gas analyzer probe being compared to a setpoint value (lambda-setpoint) as a function of the operating state of the internal combustion engine, and the system deviation being supplied to a controller, which regulates the operating parameters of the internal combustion engine correspondingly, the dynamic diagnosis of the exhaust gas analyzer probe being implemented with a closed control loop, and the deviation from the setpoint value (lambda-setpoint) of the measuring signal (lambda-actual) of a slowing exhaust gas analyzer probe being amplified by the intervention of the controller and the dynamic diagnosis is implemented on the basis of this amplified deviation. The method allows a reliable diagnosis of the dynamic response of the exhaust gas analyzer probe with excellent differentiation with respect to stochastically occurring fault signals.