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Vehicle automatic transmission control system

  • US 5,067,374 A
  • Filed: 11/20/1989
  • Issued: 11/26/1991
  • Est. Priority Date: 11/18/1988
  • Status: Expired due to Term
First Claim
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1. A system for controlling a gear-ratio of an automatic transmission in a vehicle, comprising:

  • first means for determining parameters relating to operating conditions of the vehicle including degree of throttle opening and vehicle speed;

    second means for establishing a membership function of a fuzzy set of at least one of the determined parameters in accordance with a first set of at lest one fuzzy production rule defining a respective conclusion for adjusting at least one of said determined parameters and for carrying out a first fuzzy reasoning based on said first set of fuzzy production rules to adjust at least one of said determined parameters;

    third means for establishing another membership function of a fuzzy set of at least one of the determined or adjusted parameters in accordance with a second set of fuzzy production rules defining respective gear ratio shifting conclusions and for carrying out a second fuzzy reasoning based on said second set of fuzzy production rules to determine a gear ratio to be engaged; and

    actuator means for driving a gear ratio shift mechanism in response to the determine gear ratio.

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