Clutch-to-clutch control in an automatic transmission

Details Clutch-to-clutch control in an automatic transmission Clutch-to-clutch control in an automatic transmission

1990-01-11

1991-10-22

Braun, Leslie A.

Machine element or mechanism

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

Preselected indexed position

192109F, B60K 4122

Patent

active

050584600

ABSTRACT:
In an automatic transmission, upshifting is controlled by ramping down the pressure in an off-going clutch associated with a high speed ratio and increasing the pressure in an on-coming clutch associated with a lower speed ratio. The on-coming clutch has commanded pressure at a maximum value for an initial fill time, a lower increasing ramp value during the ramp of the off-going clutch until the on-coming clutch starts to engage, and then a closed-loop control until the clutch reaches a synchronous speed. 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.

REFERENCES:
patent: 3752011 (1973-08-01), Casey et al.
patent: 3754482 (1973-08-01), Sanders et al.
patent: 4086994 (1978-05-01), Hirosawa et al.
patent: 4150737 (1979-04-01), Patton
patent: 4289221 (1981-09-01), Chambers et al.
patent: 4380278 (1983-04-01), Lasken
patent: 4527678 (1985-07-01), Pierce et al.
patent: 4529072 (1985-07-01), Oguma et al.
patent: 4646891 (1987-03-01), Braun
patent: 4662488 (1987-05-01), Hiramatsu et al.
patent: 4790418 (1988-12-01), Brown et al.

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