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Fuel cell vehicle

  • US 8,386,105 B2
  • Filed: 01/16/2009
  • Issued: 02/26/2013
  • Est. Priority Date: 04/25/2008
  • Status: Active Grant
First Claim
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1. A method of controlling a fuel cell vehicle comprising a traction motor, a fuel cell, a first DC/DC converter for stepping up an output voltage of the fuel cell and supplying the stepped-up voltage to the traction motor, an electric storage device, a second DC/DC converter disposed between the traction motor and the electric storage device, and a controller for controlling the supply of electric power to the traction motor, the method comprising the steps of:

  • setting the output voltage of the fuel cell to be higher than a necessary voltage of the traction motor when the fuel cell vehicle is in a rated state in which the traction motor operates to produce an output smaller than a continuous rated output thereof, and setting the output voltage of the fuel cell to be lower than the necessary voltage of the traction motor when the fuel cell vehicle is in a non-rated state in which the traction motor operates to produce an output larger than the continuous rated output;

    by the controller, controlling the first DC/DC converter to step up the output voltage of the fuel cell when the controller judges that the output voltage of the fuel cell is lower than the necessary voltage of the traction motor;

    by the controller, performing a current target value control process for the second DC/DC converter in the rated state; and

    by the controller, performing a voltage target value control process for the second DC/DC converter in the non-rated state,wherein the continuous rated output represents a rated guaranteed output as an output of the traction motor that is required for the fuel cell vehicle to climb a target gradient at a target vehicle speed which serves as a vehicle power performance target value;

    the rated state is a traction motor driving state for driving the traction motor at an output equal to or smaller than the rated guaranteed output; and

    the non-rated state is a traction motor driving state for driving the traction motor at an output greater than the rated guaranteed output.

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