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Method for controlling transmission control clutches

  • US 5,449,329 A
  • Filed: 08/20/1993
  • Issued: 09/12/1995
  • Est. Priority Date: 07/20/1993
  • Status: Expired due to Term
First Claim
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1. In a vehicle powershift transmission having a plurality of hydraulic pressure operated control elements for shifting the transmission, a control system for controlling pressurization of the control elements, the control system comprising:

  • means for applying to each oncoming element a fill pressure pulse for fill periods which are unique for each element;

    means for determining shift time values, subsequent to filling of the control elements, as a function of the fill period;

    means for applying pressure signals to the control elements at times represented by the shift time values, wherein the shift time values for each element are unique;

    means for determining, subsequent to a realignment time, realignment shift time values which are the same for all of the control elements; and

    means for applying pressure signals to the control elements subsequent to the realignment time, at times determined as a function of the realignment shift time values.

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