Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1985-11-14
1987-08-11
Braun, Leslie
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74867, 74752A, B60K 4104
Patent
active
046853561
ABSTRACT:
A control system for an automatic transmission system for a vehicle is adapted to control a partial clutch condition of one of two friction engaging devices which are oppositely engaged and disengaged in shifting the transmission from one speed stage to another speed stage, the control being such as to engage or disengage the one friction engaging device gradually by repetitive incremental increase or decrease of actuating fluid pressure supplied to the one friction engaging device while repetitively watching the rotational speed of a rotational element in the transmission during small time intervals. The gradual increase or decrease of the actuating fluid pressure in the one friction engaging device proceeds consistently as long as the rotational speed of the rotational element changes consistently but is temporarily reversed when the change of the rotational speed of the rotational element has deviated from its consistent trend of change as reflecting by the incremental increase or decrease of the actuating fluid pressure getting too high to maintain a smooth shifting between the speed stages.
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Braun Leslie
Novais David
Toyota Jidosha & Kabushiki Kaisha
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