Transmission control system with modified friction engaging mech

Details Transmission control system with modified friction engaging mech Transmission control system with modified friction engaging mech

1980-11-25

1983-07-26

Dorner, Kenneth

Machine element or mechanism

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

Preselected indexed position

74865, 74867, B60K 4110

Patent

active

043948278

ABSTRACT:
A fluid pressure control system for controlling an automatic transmission which includes a gear transmission mechanism and several fluid pressure actuated friction engaging mechanisms, selective engagement of which provides various speed stages from the gear transmission mechanism. A line pressure valve produces a line pressure which increases from a base pressure by an amount proportional to engine load. A throttle pressure valve produces a throttle pressure which is proportional to engine load. A shift valve selectively switches supply of an actuating pressure to one of the friction engaging mechanisms via a passage, according to the operational condition of the vehicle. The actuating pressure is supplied by a fluid pressure control system which receives supply of line pressure and which outputs a pressure which, when engine load is medium, is approximately equal to line pressure, but which, when engine load is small or is large, is substantially lower than line pressure. Thereby, the performance of the actuating pressure for cushioning over abrupt engagement of the friction engaging mechanism is more suitably tailored to the torque characteristics of the engine of the vehicle, and gear shift shock is accordingly reduced.

REFERENCES:
patent: 3908485 (1975-09-01), Moyauchi
patent: 4056991 (1977-11-01), Sakai
patent: 4125038 (1978-11-01), Hiramatsu
patent: 4308765 (1982-01-01), Iwanaga
patent: 4324156 (1982-04-01), Iwanaga

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