초록 ▼

Transmission output speed and engine throttle position are inputs to a control which determines acceleration and input speed. Fuzzy logic has acceleration and throttle membership functions and a set of upshift and downshift values, and rules for weighting each of the values in accordance with the de

Transmission output speed and engine throttle position are inputs to a control which determines acceleration and input speed. Fuzzy logic has acceleration and throttle membership functions and a set of upshift and downshift values, and rules for weighting each of the values in accordance with the degree of membership of acceleration and throttle position in certain of the functions to determine a downshift point and an upshift point. The input speed is compared to the shift points to decide whether to order a shift. Two or more sets of shift values are stored and are selectable for different performance options. The shift values are stated in terms of a percentage of engine governed speed to allow different engines to be coupled to the transmission. Lockup clutch apply and release logic controls converter lockup to maintain converter mode when significant torque multiplication is occurring and generally to maintain lockup mode when the transmission range is at or above the lowest allowable lockup range.

대표청구항 ▼

[ The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:] [1.] The method of producing shift signals in an automatic transmission driven by an engine having a governed speed, comprising the steps of:acquiring transmission output speed and thro

[ The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:] [1.] The method of producing shift signals in an automatic transmission driven by an engine having a governed speed, comprising the steps of:acquiring transmission output speed and throttle position signals:deriving an acceleration value from the output speed;setting a plurality of upshift values and downshift values which are fixed percentages of the governed speed;establishing membership functions for positive and negative acceleration and for throttle position;determining the degree of membership in each membership function for current acceleration and throttle position values;weighting upshift values and downshift values according to rules employing the degree of membership in selected membership functions;calculating shift points in accordance with said weighted values; andproducing a shift signal in accordance with the relation of the speed signal to said shift points by calculating the transmission input speed from the output speed and gear ratio, and comparing the calculated input speed to the upshift and downshift points.