Control system for an automatic transmission

Details Control system for an automatic transmission Control system for an automatic transmission

1991-08-28

1993-01-05

Wright, Dirk

Machine element or mechanism

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

Preselected indexed position

74844, F16H 6106

Patent

active

051760460

ABSTRACT:
A control system for an automatic transmission has a shift gear mechanism with a plurality of frictional elements, including a low reverse brake which is selectively actuated for switching a power transmitting path to establish a desired shift stage. A hydraulic control circuit controls supply of a hydraulic fluid to and relief of the fluid from an actuator for the frictional element. An accumulator is provided in a hydraulic passage communicated with the low reverse brake for obviating a shock as the low reverse brake is engaged. Back pressure of the accumulator is controlled when a first shift gear stage is established through the engagement of the low reverse brake. A torque shock can be suppressed when the first stage is established in an L-range.

REFERENCES:
patent: 4722250 (1988-02-01), Sumiya et al.
patent: 4930376 (1990-06-01), Van Selous
patent: 4955256 (1990-09-01), Kashihara et al.
patent: 4987982 (1991-01-01), Yamaguchi
patent: 5005443 (1991-04-01), Sugano

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