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Speed ratio control device and method for working vehicle

  • US 9,199,644 B2
  • Filed: 03/07/2008
  • Issued: 12/01/2015
  • Est. Priority Date: 03/09/2007
  • Status: Expired due to Fees
First Claim
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1. A speed ratio control device for a working vehicle that uses an output of an internal combustion engine as a working power and a traveling power, and comprises an accelerator pedal that increases a rotation speed of the internal combustion engine when depressed and a transmission that shifts a rotation of the internal combustion engine and applies the shifted rotation to the traveling power, comprising:

  • a programmable controller programmed to;

    calculate a first target vehicle speed according to the rotation speed of the internal combustion engine;

    calculate a second target vehicle speed according to a depression amount of the accelerator pedal;

    vary the speed ratio of the transmission to achieve the first target vehicle speed when the first target vehicle speed is lower than the second target vehicle speed; and

    vary the speed ratio of the transmission to achieve the second target vehicle speed when the first target vehicle speed is not lower than the second target vehicle speed.

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