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Target volume based torque phase control during upshift

  • US 7,292,922 B2
  • Filed: 09/08/2005
  • Issued: 11/06/2007
  • Est. Priority Date: 09/08/2005
  • Status: Active Grant
First Claim
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1. A transmission control system for a transmission including a first gear engagement element that receives fluid and engages a first gear in response to pressure from the fluid, comprising:

  • an electromagnetic actuator that receives a control signal and that selectively interrupts flow of the fluid to the first gear engagement element based on a duty cycle of said control signal; and

    a control module that generates said control signal and that adjusts said duty cycle so that a flow rate of the fluid to the first gear engagement element continuously decreases as the first gear engagement element produces a first torque sufficient to hold the first gear,wherein said flow rate is based on a first estimated volume of the fluid necessary for the first gear engagement element to produce said first torque.

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