F - Mech Eng,Light,Heat,Weapons – 16 – H
Patent
F - Mech Eng,Light,Heat,Weapons
16
H
F16H 63/00 (2006.01) F16H 61/02 (2006.01) F16H 61/14 (2006.01) F16H 59/38 (2006.01) F16H 59/46 (2006.01) F16H 59/48 (2006.01) F16H 61/00 (2006.01)
Patent
CA 2106150
G-10031 FUZZY LOGIC SHIFT SCHEDULING FOR AUTOMATIC TRANSMISSIONS ABSTRACT OF THE DISCLOSURE 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.
Bai Shushan
Mccauley Phillip Franklin
Robinson Timothy Alan
Thompson Scott Mcclellan
General Motors Corporation
Gowling Lafleur Henderson Llp
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