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Travel controller for work vehicle

  • US 8,332,089 B2
  • Filed: 07/31/2008
  • Issued: 12/11/2012
  • Est. Priority Date: 08/06/2007
  • Status: Active Grant
First Claim
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1. A work vehicle comprising:

  • a travel body comprising wheels on its front and rear, and right and left sides, of which wheels, a front pair or a rear pair of right and left wheels are drive wheels;

    a steering actuator, which drives a link mechanism that directs said pair of right and left drive wheels, and thereby changes steering angles at said drive wheels;

    two induction motors, which independently drive said pair of right and left drive wheels, respectively;

    a battery, which is used for supplying electric power to said two induction motors;

    an inverter, which converts DC power from said battery to AC power and supplies the AC power to said two induction motors for driving both said two induction motors to rotate;

    travel-operating means, which is operated for travel control of said travel body;

    steering-operating means, which is operated to set a turning direction for said travel body;

    steering-controlling means, which controls operation of said steering actuator such that the steering angles at said drive wheels correspond to operation of said steering-operating means;

    inverter-controlling means, which controls operation of said inverter to rotate said induction motors at a speed that corresponds to the operation of said travel-operating means; and

    steering-angle-detecting means, which detects the steering angles at said drive wheels, whereinwhen a steering is detected by said steering-angle-detecting means, said inverter-controlling means controls the operation of said induction motors through said inverter such that said motors acquire a characteristic that their torque output changes more gradually than otherwise over a corresponding rotational speed change.

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