Method of adaptive control for closed throttle downshift in an a

Details Method of adaptive control for closed throttle downshift in an a Method of adaptive control for closed throttle downshift in an a

1990-01-11

1993-05-18

Wright, Dirk

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

3644241, F16H 6106

Patent

active

052110796

ABSTRACT:
In an automatic transmission, clutch-to-clutch closed throttle downshifting is controlled by filling the on-coming clutch at a maximum pressure command for a set period while commanding the off-going clutch pressure to a low value and exhausting the off-going clutch before the end of the fill period. At the end of the fill period the on-coming pressure is set to an initial value and then ramped up until turbine speed is pulled up due to off-going clutch slippage. Then a closed-loop profile control period starts wherein the slip of the on-coming clutch is measured and controlled to a slip profile. When synchronization of the on-coming clutch is detected, maximum pressure is commanded. Parameters for controlling the quality of a shift such as on-coming clutch initial pressure and on-coming clutch fill time are automatically adjustable during vehicle use to correct shift aberrations which degrade shift quality.

REFERENCES:
patent: 4653350 (1987-03-01), Downs et al.
patent: 4698763 (1987-10-01), Smyth
patent: 4707789 (1987-11-01), Downs et al.
patent: 4843922 (1989-07-01), Kashihara
patent: 4870581 (1989-09-01), Ito et al.
patent: 4875391 (1989-10-01), Leising et al.
patent: 4922425 (1990-05-01), Mack et al.
patent: 4928557 (1990-05-01), Takada et al.

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