Inference-based manual pulldown control of an automatic transmission

摘要: A shift pattern control for a multiple speed ratio transmission wherein an inference-based overrides the normal to automatically achieve manual pulldown operation under conditions which such would be advised and expected. The is achieved with fuzzy logic technique by vehicle parameters influencing desirability of are measured or estimated, used establish aggregate measure overall need engine braking downshifting. In preferred embodiment, include speed, grade load, throttle position, time deceleration. applied membership functions indicate truthfulness specified conditions, logical combinations truth indications formed, weighted reflect their criticality, combined form operation.