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System for controlling vehicle automatic transmission using fuzzy logic

  • US 5,323,318 A
  • Filed: 09/04/1992
  • Issued: 06/21/1994
  • Est. Priority Date: 09/04/1991
  • Status: Expired due to Term
First Claim
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1. A system for controlling a multi-step geared or continuously variable automatic transmission of a vehicle, comprising:

  • first means for determining parameters at least indicative of an engine load and a vehicle speed;

    second means for carrying out a fuzzy reasoning using parameters at least including the engine load and the vehicle speed to correct at least one of the determined engine load and the vehicle speed;

    third means for retrieving a preestablished shift diagram by the parameters at least including the one corrected through said fuzzy reasoning to determine a gear ratio to be shifted to;

    fourth means for carrying out a second fuzzy reasoning to infer a driver'"'"'s intention and wherein said second means carries out the first fuzzy at least using the inferred driver'"'"'s intention to correct at least one of the determined engine load and the vehicle speed parameters; and

    actuator means for driving a gear ratio shaft mechanism in response to the determined gear ratio.

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