Line pressure control arrangement for automotive automatic trans

Details Line pressure control arrangement for automotive automatic trans Line pressure control arrangement for automotive automatic trans

1990-02-26

1992-04-14

Braun, Leslie A.

Machine element or mechanism

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

Preselected indexed position

3644241, 74869, F16H 6106

Patent

active

051036940

ABSTRACT:
When a shift command is issued the line pressure is dropped to a first low level until such time as the inertia phase of the shift begins. From this time the level of line pressure is raised and maintained at a second higher level until the end of the inertia phase. During the final stage of the shift, the level of line pressure is again lowered. A spike in the transmission torque output when tends to occur at the beginning of the inertia phase is attenuated, the level of torque which is transmitted during the inertia phase is elevated and spikes which tend to be produced by the final engagement are reduced by the temporarily lowered final stage line pressure level.

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