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:
May. 12, 2009
Filed:
Sep. 25, 2006
Ashraf K. Kamel, Indianapolis, IN (US);
Robert W Koseluk, Carmel, IN (US);
Kevin M. Gertiser, Kokomo, IN (US);
Larry R. Hach, Kokomo, IN (US);
Ashraf K. Kamel, Indianapolis, IN (US);
Robert W Koseluk, Carmel, IN (US);
Kevin M. Gertiser, Kokomo, IN (US);
Larry R. Hach, Kokomo, IN (US);
Delphi Technologies, Inc., Troy, MI (US);
Abstract
A sensing circuit for detecting open and short circuit conditions in sensors is provided. The sensing circuit includes switching circuitry, a voltage supply, a test capacitor, and an operational amplifier. The switching circuitry is electrically coupled to the voltage supply, test capacitor, operational amplifier, and a sensor. The sensing circuit is configured to provide for a normal operating mode in which the sensing circuit provides an output indicative of a voltage across the sensor, and a charging mode in which the test capacitor is coupled to the sensor and operational amplifier and charged to a steady state, and in which the output of the operational amplifier is a function of the test capacitor capacitance and the capacitance of the sensor. A method for detecting open and short circuit conditions in sensors is also provided.