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Method and apparatus for operating an electric vehicle having a hybrid battery

  • US 5,808,448 A
  • Filed: 11/30/1995
  • Issued: 09/15/1998
  • Est. Priority Date: 11/30/1994
  • Status: Expired due to Term
First Claim
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1. Apparatus for driving an electric vehicle having a driving motor, a dc electric power source comprising a power battery coupled to said motor by means of an inverter and an energy battery connected in parallel with said power battery by means of an energy battery control switch, a control device including signal generating means for generating a signal to control rotation of the motor, and an ON-OFF key switch for said control device, said apparatus comprising:

  • a battery current/voltage control unit for controlling said energy battery control switch based on current or voltage of one of said power battery, said energy battery and said motor, and for maintaining a voltage of said dc electric power source within a given range; and

    charging means for charging said power battery from said energy battery when said key switch is turned off, if a charge level of said power battery is below a given value, and for stopping said charging if said charge level is above a given value;

    wherein said energy battery has drive pumps coupled to supply fuel and recirculate water, said drive pumps using said power battery as the electric power source at starting operation.

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