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:
Feb. 21, 2006
Filed:
Jun. 24, 2003
Bruce A. Rogers, Novi, MI (US);
Paul A. Bauerle, Fenton, MI (US);
Vivek Mehta, Bloomfield Hills, MI (US);
Cheryl A. Williams, Ann Arbor, MI (US);
Bruce A. Rogers, Novi, MI (US);
Paul A. Bauerle, Fenton, MI (US);
Vivek Mehta, Bloomfield Hills, MI (US);
Cheryl A. Williams, Ann Arbor, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A diagnostic apparatus is suitable for use in an automobile controller and includes a power supply terminal conducting a reference voltage, a sampling circuit and a reference voltage diagnostic circuit. The sampling circuit is coupled to the power supply terminal and has an output terminal for providing sampled values of the reference voltage. The reference voltage diagnostic circuit has an input terminal coupled to the output terminal of the sampling circuit. The reference voltage diagnostic circuit maintains a historical value of the reference voltage over a predetermined time period, compares a current sampled value of the reference voltage to the historical value, and indicates a fault in the reference voltage in response to the current sampled value being different from the historical value by more than a predetermined threshold.