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. 16, 2016
Filed:
Nov. 07, 2012
Zero Motorcycles, Inc., Scotts Valley, CA (US);
Nathan Glenn Knight, Santa Cruz, CA (US);
Kenyon Michael Kluge, Santa Cruz, CA (US);
Ryan John Biffard, Soquel, CA (US);
Lucas Remington Workman, Scotts Valley, CA (US);
Zero Motorcycles, Inc., Scotts Valley, CA (US);
Abstract
Improved battery charge state determination. The estimated charge state of a battery comprising a plurality of series connected cells is updated using Coulomb counting during battery operation, for example, while operating an electric vehicle motor. The estimated charge state may be coupled to a fuel gauge. When the battery is in a no load state, a no load voltage measurement is made. During testing, a set of relationships between battery no load voltages and associated known good charge states have been determined. The measured no load voltage is compared to the set of no load voltages associated with known good charge states. A known good charge state associated with the measured no load voltage is used to update the estimated charge state, thereby providing a more accurate indication of the actual battery charge state, thus providing a more robust and accurate fuel gauge.