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:
Jul. 21, 2009
Filed:
Sep. 11, 2007
Robert J. Horner, Dexter, MI (US);
Craig M. Sawdon, Williamston, MI (US);
Thomas a Szpakowski, South Lyon, MI (US);
Brian Carl Nelson, Bath, MI (US);
Karl T. Kiebel, Royal Oak, MI (US);
Marilyn L Kindermann, Milford, MI (US);
Anthony L. Marks, Novi, MI (US);
Robert J. Horner, Dexter, MI (US);
Craig M. Sawdon, Williamston, MI (US);
Thomas A Szpakowski, South Lyon, MI (US);
Brian Carl Nelson, Bath, MI (US);
Karl T. Kiebel, Royal Oak, MI (US);
Marilyn L Kindermann, Milford, MI (US);
Anthony L. Marks, Novi, MI (US);
GM Global Technology Operations, Inc., Detroit, MI (US);
Abstract
A knock sensor diagnostic system may include a knock sensor. A bias circuit applies a bias voltage to the knock sensor. An input circuit receives an input signal based on the bias voltage. A control module indicates a short circuit associated with the knock sensor based on the input signal. A knock sensor diagnostic system may also or alternatively include a signal generator that generates and applies a test signal with a predetermined frequency to the knock sensor. Another input circuit receives another input signal that is based on the test signal. A control module indicates an open circuit associated with the knock sensor based on the other input signal.