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Vehicle with power source system mounted thereon, power source system controller, method of controlling power source system, and method of controlling start of such vehicle

  • US 6,522,960 B2
  • Filed: 04/13/2001
  • Issued: 02/18/2003
  • Est. Priority Date: 05/02/2000
  • Status: Expired due to Term
First Claim
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1. A vehicle that utilizes electrical energy of a high voltage power source system including a high voltage battery, said vehicle comprising:

  • a control unit that carries out controls related to driving of said vehicle;

    a low voltage power source circuit that supplies electrical energy of a low voltage power source system including a low voltage battery to said control unit;

    a battery voltage measurement unit that measures a voltage level of the low voltage battery, and determines if the measured voltage level is lower than a preset voltage that enables said control unit to operate properly and higher than a minimum voltage that enables the low voltage battery to recover;

    a converter unit that converts the electrical energy of the high voltage power source system into a low voltage and charges the low voltage battery with the converted low voltage electrical energy; and

    a recovery unit that, when an observed voltage of the low voltage battery is lower than a preset minimum reference voltage at the time of a requirement to start said vehicle, activates said converter unit to recover the voltage of the low voltage battery to the preset minimum reference voltage, prior to a permission to operate said control unit.

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