System for controlling rate of speed change in automatic transmi

Details System for controlling rate of speed change in automatic transmi System for controlling rate of speed change in automatic transmi

1987-03-30

1989-05-23

Diehl, Dwight G.

Machine element or mechanism

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

Preselected indexed position

74867, B60K 4106

Patent

active

048319007

ABSTRACT:
A control system for an automatic transmission employed in a vehicle comprises a torque converter coupled with an engine, power transmitting gear arrangement disposed at an output end of the torque converter, a speed change mechanism for giving rise to speed change in the power transmitting gear arrangement, a fluid servo control device having an applying chamber and a releasing chamber to each of which a fluid is supplied and operative to cause the speed change mechanism to work, and an additional control device for controlling the fluid servo control device under a situation in which the fluid in the releasing chamber of the fluid servo control device is so controlled as to have one of speeds in the power transmitting gear arrangement. The fluid servo control device is controlled by the additional control device to be in a first condition wherein the fluid is supplied to the applying chamber and in a second condition wherein the fluid is drained from the applying chamber selectively in response to the operating condition of the engine or the travelling condition of the vehicle.

REFERENCES:
patent: 4462278 (1984-07-01), Murakami et al.
patent: 4513639 (1985-04-01), Hiramatsu
patent: 4558612 (1985-12-01), Shimizu et al.
patent: 4580466 (1986-04-01), Iwanaga
patent: 4607542 (1986-08-01), Sugano
patent: 4665776 (1987-05-01), Sugano

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