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DRIVE SYSTEM FOR ELECTRICALLY DRIVEN DUMP TRUCK

  • US 20090132116A1
  • Filed: 05/18/2007
  • Published: 05/21/2009
  • Est. Priority Date: 06/06/2006
  • Status: Abandoned Application
First Claim
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1. A drive system for an electrically driven dump truck which travels using the electric energy, the drive system comprising:

  • a prime mover;

    an electric generator which is driven by said prime mover;

    electric motors for traveling, each of which is driven by the electric power supplied from said electric generator;

    inverters which are connected to said electric generator, and which control said electric motors;

    other prime mover loads other than said electric generator, said other prime mover loads being driven by said prime mover;

    measuring means for measuring the environment state quantity which fluctuates in response to ambient working environment;

    correction coefficient calculation means for, on the basis of the correlation between the environment state quantity and a correction coefficient, the correlation being provided beforehand, calculating a correction coefficient (Kp) in response to the environment state quantity detected by said measuring means;

    horsepower calculation means for calculating the maximum output horsepower (f(Ne)) which can be output by said prime mover, and the horsepower for driving said other prime mover loads (g(Ne)), on the basis of the target revolution speed of said prime mover or the actual revolution speed thereof;

    maximum horsepower calculation means for correcting the horsepower for driving said other prime mover loads by use of the correction coefficient which has been calculated by said correction coefficient calculation means, and for subtracting the horsepower for driving said other prime mover loads after the correction from the maximum output horsepower which can be output by said prime mover, so as to determine the maximum horsepower (Mr) which can be used by said electric motors for traveling; and

    inverter control means for determining the target torque (TrL, TrR) of said electric motors for the traveling on the basis of the maximum horsepower which can be used by said electric motors for traveling, the maximum horsepower having been calculated by said maximum horsepower calculation means, and for controlling said inverters on the basis of the calculated target torque.

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