Shift synchronization using decaying torque

Details Shift synchronization using decaying torque Shift synchronization using decaying torque

1999-07-06

2000-10-03

Estremsky, Sherry

Interrelated power delivery controls, including engine control

Transmission control

Engine controlled by transmission

477109, B60K 4106

Patent

active

061265705

ABSTRACT:
A method of engaging and disengaging transmission gears in a vehicle is provided. A controller processes an initial torque representing an engine torque and an estimated zero torque representing an estimate of a transmission output shaft torque. The controller also sets a high and low band torque about the estimated zero torque. Once the above torques have been determined, the controller compares the initial torque to the high band torque. If the initial torque is below the high band torque, the controller increases the engine torque to the high band torque. If the initial torque is greater than the high band torque, then no preliminary adjustments to the engine torque need be made. At least one shift valve is energized when the engine torque is equal to or greater than the high band torque. The engine torque is decayed by the controller to the low band torque to facilitate engaging and disengaging transmission gears.

REFERENCES:
patent: 5573477 (1996-11-01), Desautels et al.
patent: 5785627 (1998-07-01), Uno et al.
patent: 5827151 (1998-10-01), Sawamura et al.
patent: 5839987 (1998-11-01), Sawamura et al.
patent: 5863275 (1999-01-01), Nozaki et al.
patent: 5876301 (1999-03-01), Tabata et al.
patent: 5980424 (1999-11-01), Huber et al.
patent: 6015366 (2000-01-01), Markyuech et al.

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