Vehicle Automatic Transmission Control System

摘要

A system for controlling a multi-step geared or continuously variable automatic transmission in which a value of gear ratio to be shifted to (SMAP) is determined by retrieving a conventional preestablished shift diagram by an engine load ( DIAMETER th) and a vehicle speed (V). A fuzzy reasoning is carried out using parameters such as a driving resistance (DEC) to correct the retrieved gear ratio. In one embodiment, the fuzzy reasoning is carried out to correct one of the engine load and vehicle speed detected and, using the corrected value, a gear ratio to be shifted to is retrieved from the shift diagram. Another fuzzy reasoning is carried out to ascertain the driver's intention to decelerate and the first fuzzy reasoning is carried out using the inferred value so as to reflect the driver's intention in the shift control. In an alternative embodiment, a correction value from the fuzzy reasoning ( DELTA SMAP) is added to the retrieved gear ratio (SMAP) to arrive at a shift value subsequently used to determine a final gear ratio to be shifted to.