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. 07, 2012
Filed:
Jun. 27, 2008
Xiaodong Zhang, Mason, OH (US);
Nick S. Kapsokavathis, Shelby Township, MI (US);
Yilu Zhang, Northville, MI (US);
David W. Walters, Sterling Heights, MI (US);
Xidong Tang, Sterling Heights, MI (US);
Mutasim A. Salman, Rochester Hills, MI (US);
Xiaodong Zhang, Mason, OH (US);
Nick S. Kapsokavathis, Shelby Township, MI (US);
Yilu Zhang, Northville, MI (US);
David W. Walters, Sterling Heights, MI (US);
Xidong Tang, Sterling Heights, MI (US);
Mutasim A. Salman, Rochester Hills, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A method is provided for determining a battery's state-of-health. An initial battery voltage is measured after a first voltage drop during an initiation of an engine cranking phase. A battery voltage is monitored during the remainder of the engine cranking phase. A lowest battery voltage is determined during the remainder of the engine cranking phase. A determination is made if a voltage difference between the lowest battery voltage and the initial battery voltage at the initiation of the engine cranking phase is less than a voltage threshold. A low battery state-of-health is identified in response to the voltage difference being less than the voltage threshold.