(19)
(11)EP 1 151 892 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
02.07.2003 Bulletin 2003/27

(43)Date of publication A2:
07.11.2001 Bulletin 2001/45

(21)Application number: 01110393.4

(22)Date of filing:  26.04.2001
(51)Int. Cl.7B60L 11/12, B60L 11/18
(84)Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
Designated Extension States:
AL LT LV MK RO SI

(30)Priority: 02.05.2000 JP 2000133297

(71)Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Aichi-ken 471-8571 (JP)

(72)Inventor:
  • Nada, Mitsuhiro
    Toyota-shi, Aichi-ken 471-8571 (JP)

(74)Representative: Leson, Thomas Johannes Alois, Dipl.-Ing. 
Tiedtke-Bühling-Kinne & Partner GbR, TBK-Patent, Bavariaring 4
80336 München
80336 München (DE)

  


(54)Vehicle with a high voltage power source system and method of controlling the start of such vehicle


(57) The technique of the present invention sets two reference voltages, that is, a minimum reference voltage and an operation inhibiting reference voltage, as the criteria for detecting the conditions of power supply of a low voltage power source system including a low voltage battery. The operation inhibiting reference voltage is lower than the minimum reference voltage and represents a threshold value ensuring the normal operation of an apparatus that establishes the power source of a high voltage power source system. In a first range where the power source voltage of the low voltage battery is lower than the minimum reference voltage but is not lower than the operation inhibiting reference voltage, a converter is activated to charge the low voltage battery, so as to recover the power source voltage of the low voltage battery to the minimum reference voltage. The whole system of, for example, a vehicle or an apparatus then functions normally. In a second range where the power source voltage of the low voltage battery is lower than the operation inhibiting reference voltage, on the other hand, operation of the whole system is inhibited. This arrangement brings outs the best performance of the low voltage battery while assuring safety of the whole system.