(19)
(11)EP 2 290 388 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
21.05.2014 Bulletin 2014/21

(43)Date of publication A2:
02.03.2011 Bulletin 2011/09

(21)Application number: 10168649.1

(22)Date of filing:  07.07.2010
(51)International Patent Classification (IPC): 
G01R 31/36(2006.01)
(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
Designated Extension States:
BA ME RS

(30)Priority: 26.08.2009 SE 0950610

(71)Applicant: Scania CV AB
151 87 Södertälje (SE)

(72)Inventor:
  • Ledfelt, Gunnar
    155 91 Nykvarn (SE)

  


(54)Battery condition determination


(57) An improved battery condition determination for use in a dual battery system is disclosed. The dual battery system includes power battery means being connected to an electrical system including a starter motor, and starter battery means being connectable in parallel with the power battery means by a dual circuit breaker, whereby, when the dual circuit breaker is closed, the power battery means and the starter battery means provide a dual system voltage to the electrical system. According to the invention the following steps being performed during a time period when a starter motor is inactive:
- determining, when the dual circuit breaker is open, at least one of an open circuit power battery voltage and an open circuit starter battery voltage,
- determining, when the dual circuit breaker is closed, the dual system voltage, and
- utilizing the dual system voltage and the determined at least one of the open circuit power battery voltage and the open circuit starter battery voltage for determining a relative state of health for the power battery means, wherein the relative state of health is related over time to a state of health for the starter battery means.
















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