Selectable one-way clutch control

Details Selectable one-way clutch control Selectable one-way clutch control

2005-10-31

2009-02-17

Wright, Dirk (Department: 3655)

Interrelated power delivery controls, including engine control

Transmission control

Engine controlled by transmission

Reexamination Certificate

active

07491151

ABSTRACT:
The present invention provides a method for controlling a selectable one-way clutch, or SOWC, such that engine braking is enabled. Additionally, the method of the present invention is adapted to provide engine braking using the SOWC such that a separate clutch is not required. The method is initiated by identifying a downshift command. After the downshift command has been identified, the off-going clutch associated with the current speed ratio is released. Engine speed is preferably increased to bring the relative speed across a selectable one-way clutch to approximately zero. Thereafter, the selectable one-way clutch is engaged such that is capable of holding torque in both directions. As the selectable one-way clutch can hold torque in both directions, torque is transmittable from the transmission to the engine and engine braking is thereby enabled.

REFERENCES:
patent: 5020391 (1991-06-01), Aoki et al.
patent: 5772554 (1998-06-01), Tabata
patent: 7089102 (2006-08-01), Slayton et al.
patent: 2003/0119623 (2003-06-01), Stevenson et al.
patent: 2004/0060794 (2004-04-01), Li et al.

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