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Automatic transmission control apparatus

  • US 5,231,897 A
  • Filed: 04/15/1991
  • Issued: 08/03/1993
  • Est. Priority Date: 04/17/1990
  • Status: Expired due to Term
First Claim
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1. A control apparatus for an automatic transmission of a vehicle comprising:

  • calculating means for calculating a running resistance of the vehicle;

    selecting means for selecting a gear based on a speed of the vehicle and an opening of a throttle valve of the vehicle; and

    setting means for enabling the selecting means to set the transmission to the selected gear when the running resistance is less than a first value and for preventing the selecting means from upshifting the transmission from the selected gear when the running resistance exceeds the first value, said first value being determined based upon the selected gear of the transmission and corresponds to an uphill slope;

    wherein the calculating means calculates the running resistance as a function of an engine torque and acceleration of the vehicle.

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