Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1990-09-14
1993-02-23
Bran, Leslie A.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74851, 74858, 74867, 192109F, 3644241, B60K 4102, B60K 4106
Patent
active
051880059
ABSTRACT:
To reduce shift bump and increase smoothness during shifts, pressure into an on-coming clutch of an automatic transmission is electronically controlled using a turbine speed adaptive strategy. Because of the change in engine speed that accompanies this torque flow path transition, such shifts include a torque phase and an inertia phase. To make the shift smooth, the torque phase is completed quickly by boosting pressure at the beginning of the shift. Just before the torque phase is commpleted, the pressure is lowered so the inertia phase bump is reduced. The end of the torque phase is predicted by monitoring the turbine speed rise since the start of the shift and comparing it with a value which is derived from an adaptive table. During the inertia phase, the pressure is ramped up to complete the shift quickly and smoothly. Ignition spark timing is reduced in the inertia phase to further improve shift feel.
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Carnago John F.
Sankpal Bak G.
Bran Leslie A.
Ford Motor Company
Henn David E.
May Roger L.
McKenzie Frank G.
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