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:
Dec. 19, 2000
Filed:
Oct. 14, 1999
Helmut Laig-Horstebrock, Frankfurt, DE;
Eberhard Meissner, Hofheim, DE;
Dieter Ubermeier, Hannover, DE;
Karsten Michels, Braunschweig, DE;
Uwe Dierker, Isenbuttel, DE;
V B Autobatterie GmbH, Hannover, DE;
Volkswagen AG, Hannover, DE;
Abstract
In a process for determining the state of charge and the peak current loadability of batteries in the currentless pauses before and after a loading phase the no-load voltages U.sub.01 and U.sub.02 are measured. From them, with allowance for battery-specific parameters, especially the time curve of the no-load voltage, the true battery rest voltages U.sub.001 and U.sub.002 are computed. During the loading phase the converted current quantity q is measured and from the relationship U.sub.002 -U.sub.001 =C.sub.1 .multidot.q/Q.sub.0 the acid capacity Q.sub.0 of the battery is found. The relative state of charge SOC.sub.1 is determined from a curve of the rest voltage U.sub.00 linearized by the formula SOC.sub.1 =U.sub.002 /C.sub.1 -C.sub.2 as a function of the state of charge of the battery from which the absolute state of charge is calculated as SOC.sub.1 .multidot.Q.sub.0. From the internal resistance R.sub.1, a preassigned temperature and the last determined state of charge, a rest voltage is predicted for a later time from which, with the current necessary for starting the engine known, a pronouncement can be derived concerning the starting capacity of the battery.