Control system for on-vehicle battery

  • US 5,939,861 A
  • Filed: 01/23/1998
  • Issued: 08/17/1999
  • Est. Priority Date: 05/24/1996
  • Status: Expired due to Fees
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First Claim
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1. A control system for a vehicle-mounted battery, said system comprising:

  • a motor-generator coupled to a drive shaft of a vehicle;

    a battery mounted on said vehicle;

    an inverter provided between said battery and said motor-generator, said inverter being configured to transmit energy from said battery to said motor-generator and from said motor-generator to said battery;

    inverter control means for controlling said inverter;

    a battery sensor for detecting a battery current i of said battery;

    a program control circuit comprising means for calculating a time integral I=∫

    idt+C of said battery current i, where C is an integration constant corresponding to an initial amount of charging; and

    current control means for controlling said battery current, said battery current comprising a charging current during regenerative braking and comprising a discharging current when said vehicle is being driven, said battery current being controlled in accordance with a function of said time integral I;

    said battery comprising plural unit cells, said battery sensor comprising means for individually detecting respective terminal voltages of said unit cells, and said program control circuit comprising means for controlling said charging current during regenerative braking in accordance with said terminal voltages and for controlling said discharge current during driving of said vehicle in accordance with said terminal voltages.

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