DRIVE SYSTEM FOR ELECTRICALLY DRIVEN DUMP TRUCK
First Claim
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 each 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.
1 Assignment
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Accused Products
Abstract
A drive system of an electrically driven dump truck is capable of achieving an operational feeling in which the operation amount of the accelerator pedal is well balanced with the output horsepower of the electric motors, particularly at the time of slow traveling. To achieve this, the target motor output horsepower Pm0 corresponding to the operation amount of an accelerator pedal 1 is calculated. The target motor torque Tr1R, Tr1L is calculated on the basis of the target motor output horsepower Pm0 and the rotational speed ωR, ωL of electric motors 12R, 12L respectively. The acceleration torque limit values of the electric motors 12R, 12L corresponding to the operation amount of the accelerator pedal 1 are calculated, respectively. Then, smaller values are selected, as motor torque instruction values TrR, TrL, between the acceleration torque limit value and the target motor torque Tr1R, Tr1L to control inverters 73R, 73L, respectively.
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Citations
6 Claims
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1. A drive system of an electrically driven dump truck comprising:
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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 each 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. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification