Electric car drive system provided with hybrid battery and control method

  • US 5,780,980 A
  • Filed: 04/09/1996
  • Issued: 07/14/1998
  • Est. Priority Date: 04/14/1995
  • Status: Expired due to Term
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First Claim
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1. In an electric car drive system having a car drive motor powered by a mounted direct current power supply, and a control system including a signal generating means to generate signals which control said motor speed;

  • wherein said direct current power supply comprises;

    a power battery having secondary cells connected to said motor;

    a voltage increasing circuit; and

    an energy battery comprising fuel cells connected in parallel to said power battery via said voltage increasing circuit;

    the electric car drive system further comprising;

    battery current and voltage control means which controls said voltage increasing circuit based on the current or voltage of any one of said power battery, said energy battery and said motor, and which keeps the voltage of said direct current power supply within a specified range, including charge control means which charges said power battery using said energy battery when the charge of said power battery is below a specified value, and suspends charging of said power battery when said charge is equal to or greater than the specified value.

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