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Drive system for electrically driven dump truck

  • US 8,265,849 B2
  • Filed: 05/07/2007
  • Issued: 09/11/2012
  • Est. Priority Date: 06/06/2006
  • Status: Active Grant
First Claim
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1. A drive system of an electrically driven dump truck comprising:

  • a prime mover;

    an alternating-current generator driven by the prime mover;

    at least two electric motors for traveling, each of which is driven by the electric power supplied by the alternating-current generator;

    at least two inverters, each of which is connected to the alternating-current generator, and each of which controls one of the electric motors; and

    motor control means for controlling the inverters in response to the operation amount of an accelerator pedal to control the electric motors;

    wherein the motor control means includes;

    target motor output horsepower calculation means for calculating the target motor output horsepower corresponding to the operation amount of the accelerator pedal;

    target motor torque calculation means for calculating the target motor torque on the basis of the target motor output horsepower and the rotational speed of the two electric motors;

    acceleration torque limit value calculation means for calculating acceleration torque limit values of the two electric motors corresponding to the operation amount of the accelerator pedal;

    motor torque instruction value determination means for, when the acceleration torque limit values are larger than the target motor torque, selecting the target motor torque as motor torque instruction values, and for, when the acceleration torque limit values become smaller than the target motor torque, selecting the acceleration torque limit values as motor torque instruction values; and

    inverter control means for controlling the inverters on the basis of the motor torque instruction values.

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