Automatic transmission control system

Details Automatic transmission control system Automatic transmission control system

1987-03-24

1988-10-25

Wright, Dirk

Machine element or mechanism

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

Preselected indexed position

74867, B60K 4116

Patent

active

047794917

ABSTRACT:
In an automatic transmission, a second brake is engaged when the transmission is in second and is released when the transmission is in third and first. The second brake is controlled by a hydraulic actuator. Application of the hydraulic pressure to the hydraulic actuator of the second brake is limited upon upshift from first to second so that the hydraulic pressure is gently applied to the hydraulic actuator. The limitation of application of the hydraulic pressure is nullified upon downshift from third to second.

REFERENCES:
patent: 3842693 (1974-10-01), Oberpichler
patent: 4274307 (1981-06-01), Iwanaga et al.
patent: 4324154 (1982-04-01), Iwanaga et al.
patent: 4334441 (1982-06-01), Iwanaga et al.
patent: 4445401 (1984-05-01), Ishimaru
patent: 4628774 (1986-12-01), Iwanaga

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