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Front-and rear-wheel-drive vehicle

  • US 9,387,847 B2
  • Filed: 09/23/2011
  • Issued: 07/12/2016
  • Est. Priority Date: 09/30/2010
  • Status: Active Grant
First Claim
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1. A front- and rear-wheel-drive vehicle comprising:

  • first drive wheels which are one of front wheels and rear wheels;

    second drive wheels which are the other of the front wheels and the rear wheels;

    a first drive system configured to drive the first drive wheels; and

    a second drive system configured to drive the second drive wheels, wherein the first drive system comprises;

    an electric motor configured to generate a driving force for the vehicle;

    a motor controller configured to control the electric motor;

    an engagement/disengagement unit provided in a power transmission line between the electric motor and the first drive wheels, and configured to engage or disengage the electric motor side of the power transmission line and the first drive wheels side of the power transmission line;

    an engagement/disengagement controller configured to control a state of the engagement/disengagement unit to engage or disengage the electric motor side of the power transmission line and the first drive wheels side of the power transmission line; and

    a one-way power transmission device provided in the power transmission line, the one-way power transmission device and the engagement/disengagement unit being provided in parallel between the electric motor side of the power transmission line and the first drive wheels side of the power transmission line, and the one-way power transmission device being configured to come into;

    a connected state when a forward-direction rotational power is inputted from the electric motor side of the power transmission line to the first drive wheels side of the power transmission line,a disconnected state when a reverse-direction rotational power is inputted from the electric motor side of the power transmission line to the first drive wheels side of the power transmission line,the disconnected state when the forward-direction rotational power is inputted from the first drive wheels side of the power transmission line to the electric motor of the power transmission line andthe connected state when the reverse-direction rotational power is inputted from the first drive wheels side of the power transmission line to the electric motor side of the power transmission line,wherein, when the vehicle reverses, a reverse driving force to reverse the vehicle is generated at least in the first drive system, andwherein, when the reverse driving force is generated in the first drive system, the engagement/disengagement controller controls the engagement/disengagement unit to engage the electric motor side of the power transmission line with the first drive wheels side of the power transmission line, and the motor controller drives the electric motor to generate the reverse-direction rotational power such that the reverse-direction rotational power is inputted from the electric motor side of the power transmission line to the first drive wheels side of the power transmission line.

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