Static forward and reverse engagement control system for a multi

Details Static forward and reverse engagement control system for a multi Static forward and reverse engagement control system for a multi

1998-02-03

1999-12-28

Marmor, Charles A

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid controlled mechanical clutch or brake

475120, F16H 4704

Patent

active

060074450

ABSTRACT:
A control valve system for a multiple ratio automatic transmission having a reaction brake for forward drive and a reaction brake for reverse drive. A first clutch establishes a driving connection between an input gear element and a torque input shaft establishes a forward drive torque flow path when the forward drive brake is engaged. A second clutch connects a different torque input gear element of the transmission to the torque input member when the reverse reaction brake is applied. A pressurized valve circuit with three variable force solenoids, including one variable force solenoid, establishes a controlled circuit pressure, a second variable force solenoid is dedicated for reverse engagement control and a third variable force solenoid is dedicated for forward engagement control, whereby independent reverse engagement pressures and independent forward engagement pressures on the clutches and brakes, are established. A neutral idle characteristic conditions the clutches and the brakes for minimal threshold capacity, which effectively interrupts the torque delivery path through the transmission when the torque input shaft is driven at idle speeds.

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