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Steady state slip detection/correction for a motor vehicle transmission

  • US 4,805,750 A
  • Filed: 09/28/1987
  • Issued: 02/21/1989
  • Est. Priority Date: 09/28/1987
  • Status: Expired due to Term
First Claim
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1. In a motor vehicle power transmission including a fluid operated transmission torque establishing device for transmitting torque between input and output shafts of the transmission, and a fluid pressure control mechanism for controlling the torque transmitting capacity of said torque establishing device in accordance with a pressure command, a method of operation for regulating the torque capacity of said torque establishing device during steady state operation of said transmission, comprising the steps of:

  • determining a pressure command for the fluid pressure control mechanism in accordance with a measure of the torque being transmitted through the torque establishing device;

    periodically generating a slip indication in relation to the cumulative amount of slippage of the torque establishing device;

    measuring the time required for the slip indication to exceed a predetermined reference, and when said reference is exceeded;

    increasing the commanded pressure in relation to the measured time if the measured time is less than a threshold defining a range of acceptable slippage, thereby to increase the torque transmitting capacity of said torque establishing device when the slippage thereacross is outside said acceptable range of slippage.

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