Shift control apparatus for automatic transmissions

Details Shift control apparatus for automatic transmissions Shift control apparatus for automatic transmissions

1990-10-29

1993-02-23

Braun, Leslie A.

Machine element or mechanism

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

Preselected indexed position

B60K 4106

Patent

active

051880067

ABSTRACT:
A shift control apparatus for an automatic transmission includes a kickdown orifice control valve for changing over two systems of hydraulic-pressure supply lines which supply hydraulic pressure to friction engaging elements on an engaging side via at least one orifice by sliding a spool between a first position at which the spool is urged by a spring and a second position at which the spool is urged by changeover hydraulic pressure acting in a direction opposite the spring, a solenoid valve mounted at a point along a line which introduces the changeover hydraulic pressure, and control means for controlling opening and closing of the solenoid valve, e.g., by duty-control or timer. Duty control is made according to vehicle velocity and throttle opening and corrected according to the engine rotational state.

REFERENCES:
patent: 4893527 (1990-01-01), Furusawa et al.
patent: 4928557 (1990-05-01), Takada et al.
patent: 4934218 (1990-06-01), Takase et al.

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