Hydraulic lock-up control system during shifting in automatic tr

Details Hydraulic lock-up control system during shifting in automatic tr Hydraulic lock-up control system during shifting in automatic tr

1988-10-31

1990-05-15

Bonck, Rodney H.

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

192 329, 192 33, 192 357, F16D 2514, F16D 6702

Patent

active

049249797

ABSTRACT:
A low restrictor is provided in a hydraulic line having one end connected to a fourth speed servo apply chamber of a friction device, in the form of a band brake, and an opposite end connected to a 3-4 shift valve. An accumulator is connected to the hydraulic line at a first section between the flow restrictor and the friction device. A lock-up control valve is connected to the hydraulic line at a second section between the flow restrictor and the 3-4 shift valve. The lock-up control valve includes a spool movable to a first position where a lock-up clutch is released from a second position where the lock-up clutch is engaged in response to a drop in hydraulic pressure within the second section of the hydraulic line upon shifting from the fourth speed ratio to the third speed ratio. Since the transmission of this drop to the first section of the hydraulic line is delayed by the flow restrictor and the accumulator, the release of the friction device is delayed.

REFERENCES:
patent: 3682043 (1972-08-01), Bailey et al.
patent: 4051932 (1977-10-01), Arai et al.
patent: 4095486 (1978-06-01), Ohnuma
patent: 4562905 (1986-01-01), Nishimura et al.
patent: 4572338 (1986-02-01), Miki
patent: 4595088 (1986-06-01), Sugano
patent: 4607731 (1986-08-01), Sugano
patent: 4665770 (1987-05-01), Van Selous
patent: 4697474 (1987-10-01), Sumiya et al.
patent: 4727773 (1988-03-01), Sumiya et al.
patent: 4771852 (1988-09-01), Nishikawa et al.

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