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Method and apparatus for transmission control during braking

  • US 6,269,295 B1
  • Filed: 11/16/2000
  • Issued: 07/31/2001
  • Est. Priority Date: 11/30/1999
  • Status: Expired due to Term
First Claim
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1. A method for operating a transmission of a machine comprising an engine, the transmission and a brake pedal operated brake, wherein the brake pedal may be positioned in a downshifting mode, braking mode or neutralizer mode, the method comprising:

  • (A) obtaining data relating to brake pedal position, machine velocity, machine engine speed, current transmission operating gear, and lowest operating gear;

    (B) setting downshifting thresh holds based on whether pedal position is in a downshift mode or a braking mode;

    (C) downshifting the transmission if the machine velocity and machine engine speed are less than the downshifting thresh holds, and if the transmission operating gear is not the lowest operating gear;

    (D) neutralizing the transmission if the pedal position is in a neutralizing mode, if the velocity is less than a neutralizing thresh hold velocity, and if the transmission is in the lowest operating gear; and

    (E) repeating steps (A) through (D) until the transmission is neutralized.

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