Method of automatically flushing debris from an...

Details Method of automatically flushing debris from an... Method of automatically flushing debris from an...

2007-05-08

2007-05-08

Le, David D. (Department: 3681)

Interrelated power delivery controls, including engine control

Clutch control

Condition responsive control

C477S125000, C477S127000, C477S906000, C192S085060, C137S015060, C475S116000

Reexamination Certificate

active

10846139

ABSTRACT:
The normal control of an electrically-activated hydraulic valve armature is overridden to automatically and periodically open the armature for flushing out debris that has accumulated between the armature and a seat that the armature is designed to engage. The valve develops fluid pressure for maintaining engagement of a motor vehicle transmission clutch, and when excessive slippage of the clutch is detected, the armature is forced into engagement with the seat until the slippage is reduced or a predetermined period of time has elapsed, after which the armature is temporarily positioned away from the seat to provide full flow of hydraulic fluid across the seat to flush out debris that prevents the armature from engaging the seat. During Neutral operation of the transmission, the armature is continuously positioned away from the seat, and during low torque conditions the armature is temporarily positioned away from the seat.

REFERENCES:
patent: 4981155 (1991-01-01), Pick et al.
patent: 4996894 (1991-03-01), Holbrook et al.
patent: 6015031 (2000-01-01), Dorfschmid et al.
patent: 6170506 (2001-01-01), Butwin et al.
patent: 6860284 (2005-03-01), Wuerth et al.
patent: WO 205048 (2002-01-01), None

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