Shift control arrangement for automatic transmission

Details Shift control arrangement for automatic transmission Shift control arrangement for automatic transmission

1993-06-25

1995-06-06

Look, Edward K.

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

475123, 3644241, F16H 5940, F16H 5942

Patent

active

054217911

ABSTRACT:
A shift control arrangement for an automotive automatic transmission includes a control unit active to change the state of a solenoid disposed in a hydraulic circuit of an automatic transmission during shifting so as to appropriately effect engagement and/or release of a frictional element of the automatic transmission. The control unit is further provided with a fluid temperature compensating portion so as to delay or advance a time of actuation of the solenoid, according to a detected gear ratio, to compensate for changes in fluid viscosity due to temperature, such that optimal shift characteristics for the frictional element are always maintained.

REFERENCES:
patent: 4470916 (1990-11-01), Narita
patent: 5052246 (1991-10-01), Yamaguchi
patent: 5075858 (1991-12-01), Narita

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