Double transition upshift control in an automatic transmission

Details Double transition upshift control in an automatic transmission Double transition upshift control in an automatic transmission

1989-12-11

1991-05-14

Herrmann, Allan D.

Machine element or mechanism

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

Preselected indexed position

747321, F16H 5946, F16H 6106

Patent

active

050145738

ABSTRACT:
In an automatic transmission, a double transition upshift to a target range requires the release of two off-going clutches and the engagement of two on-coming clutches. The shift is made in two stages. The first stage involves a first off-going clutch and a first on-coming clutch, and begins a shift to a third range having a speed ratio lower than the target range so that input speed is decreased and power is supplied throughout the shift. The speed decrease is managed by a closed-loop control of the first on-coming clutch until the clutch reaches a synchronous speed for the target range. The closed-loop control parameter is on-coming clutch slip speed which is controlled to a calculated slip speed profile. The profile has a first steep slope and a final less steep slope so that the actual slip can smoothly go to zero in a given time period. When near synchronous speed is reached, the second off-going clutch begins to release and at the end of the closed-loop control the second on-coming clutch is applied to complete the shift to the target range.

REFERENCES:
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patent: 4790418 (1988-12-01), Brown et al.
patent: 4796490 (1989-01-01), Butts et al.

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