Hybrid vehicles

  • US 7,455,134 B2
  • Filed: 05/08/2006
  • Issued: 11/25/2008
  • Est. Priority Date: 09/14/1998
  • Status: Expired due to Fees
First Claim
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1. A hybrid vehicle, comprising:

  • at least two wheels, operable to receive power to propel said hybrid vehicle;

    a first alternating current (AC) electric motor, operable to provide power to said at least two wheels to propel said hybrid vehicle;

    a second AC electric motor;

    an engine coupled to said second electric motor, operable to provide power to said at least two wheels to propel the hybrid vehicle, and/or to said second electric motor to drive the second electric motor to generate electric power;

    a first alternating current-direct current (AC-DC) converter having an AC side coupled to said first electric motor, operable to accept AC or DC current and convert the current to DC or AC current respectively;

    a second AC-DC converter coupled to said second electric motor, at least operable to accept AC current and convert the current to DC;

    an electrical storage device coupled to a DC side of said AC-DC converters, wherein the electrical storage device is operable to store DC energy received from said AC-DC converters and provide DC energy to at least said first AC-DC converter for providing power to at least said first electric motor; and

    a controller, operable to start and stop the engine to minimize fuel consumption;

    wherein a ratio of maximum DC voltage on the DC side of at least said first AC-DC converter coupled to said first electric motor to current supplied from said electrical storage device to at least said first AC-DC converter, when maximum current is so supplied, is at least 2.5.

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