Working fluid pressure control system for startup friction eleme

Details Working fluid pressure control system for startup friction eleme Working fluid pressure control system for startup friction eleme

1996-08-14

1998-03-31

Ta, Khoi Q.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477117, 477156, F16H 6106

Patent

active

057332207

ABSTRACT:
A working fluid pressure control system for an automatic power transmission includes a pre-charge pressure regulating mechanism for temporarily elevating a working fluid pressure abruptly and subsequently drop the working fluid pressure for generating a pre-charging constant pressure for a start-up friction element, and a detecting portion for detecting an operational range before selection of neutral range. When selection is made from neutral range to a traveling range, and the traveling range is different from the operational range before selection of the neutral range, the pre-charge pressure regulating mechanism is actuated when judgement is made that the start-up friction element engaged in the operational range before selection of neutral range is released, thus selection being performed within a short period without accompanying with a shock.

REFERENCES:
patent: 5558599 (1996-09-01), Tsukamoto et al.
patent: 5655993 (1997-08-01), Fujimoto et al.

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