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Transmission shuttle shift deceleration method

  • US 5,353,662 A
  • Filed: 01/29/1993
  • Issued: 10/11/1994
  • Est. Priority Date: 01/29/1993
  • Status: Expired due to Term
First Claim
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1. A method of decelerating an output shaft of a vehicle powershift transmission during a shuttle shift whereby rotation of the output shaft is reversed from a first direction to a second direction, the transmission having a plurality of hydraulic pressure operated clutch elements for shifting the transmission, including a set of directional clutches, the method comprising the following steps:

  • disengaging all the clutch elements, including all the directional clutches;

    applying pressurized fluid to only to both a first directional clutch and to a second directional clutch to lock up the transmission;

    when the output shaft speed is less than a threshold value, applying pressurized fluid to at least one selected clutch other than a directional clutch to engage a desired gear and to cause the output shaft to rotate in the second direction; and

    releasing pressure from at least the first directional clutch.

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