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Electric vehicle and vehicle power feeding method

  • US 10,232,719 B2
  • Filed: 02/19/2015
  • Issued: 03/19/2019
  • Est. Priority Date: 03/27/2014
  • Status: Active Grant
First Claim
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1. An electric vehicle that travels on a trackless trajectory, wherein:

  • the electric vehicle comprises;

    a traction motor;

    an energy storage device configured to supply electrical power to the traction motor;

    an energizing portion configured to come into contact with a power supplying portion and to connect electrically between the power supplying portion and the energy storage device;

    a voltage converter configured to adjust supply of electrical power to the energy storage device from the power supplying portion via the energizing portion; and

    a control unit configured to control the voltage converter;

    wherein the control unit is configured to carry out;

    a first charging control to charge the energy storage device by controlling the voltage converter so as to control an input current or an amount of change per unit time of the input current from the power supplying portion to the energy storage device, wherein the first charging control includes calculating a current difference between a present input/output current of the energy storage device and a previous input/output current of the energy storage device and comparing the current difference with a predetermined threshold value of the current difference to control a duty ratio of the voltage converter; and

    a second charging control to charge the energy storage device with electrical power from the power supplying portion in which a converting operation of the voltage converter is stopped and voltage conversion is not carried out, or to charge the energy storage device by controlling the voltage converter on a basis of a target electrical power which is a target value of electrical power supplied to the energy storage device; and

    furthermore, the control unit is configured to;

    implement the first charging control and the second charging control while a point of contact between the energizing portion and the power supplying portion is moved;

    implement the first charging control when the energizing portion comes into contact with the power supplying portion; and

    implement the second charging control after the first charging control, and for a period of time longer than that of the first charging control.

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