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Control of gear shifting in automatic transmission

  • US 5,131,295 A
  • Filed: 05/21/1991
  • Issued: 07/21/1992
  • Est. Priority Date: 05/22/1990
  • Status: Expired due to Fees
First Claim
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1. A method of controlling an automatic transmission of a motor vehicle, wherein the automatic transmission has an output member, and effects a gear shifting by a hydraulically actuatable coupling by a pressurized hydraulic fluid, the method comprising the steps of:

  • detecting a torque of the output member and generating an output torque indicative signal indicative of said torque detected;

    measuring a length of time elapsed after a rate of change of said output torque indicative signal has met a predetermined relationship with a predetermined value after generation of a gear shifting command signal and generating a time indicative signal indicative of said length of time elapsed;

    modifying the pressurized hydraulic fluid as a predetermined function of said time indicative signal; and

    actuating the hydraulically actuable coupling by said modified pressurized hydraulic fluid.

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