Interrelated power delivery controls – including engine control – Clutch control – Regulated clutch engagement
Reexamination Certificate
2006-01-27
2008-10-07
Lewis, Tisha D (Department: 3681)
Interrelated power delivery controls, including engine control
Clutch control
Regulated clutch engagement
C477S070000
Reexamination Certificate
active
07431678
ABSTRACT:
There is provided a hydraulic pressure control device for an automatic transmission having a fail-safe mechanism to cope with an operation malfunction of electromagnetic valves. A first changeover valve that can be switched between a normal state where a drain port EX of each electromagnetic valve communicates with a predetermined drain destination and a failure state where the drain port EX and a predetermined hydraulic oil supply passage is disposed in a drain oil passage of clutches C1and C2, and a second changeover valve that can be switched between a normal state where a supply port IN of each electromagnetic valve communicates with a predetermined hydraulic oil supply passage and a failure state where the supply port IN communicates with a predetermined drain destination is disposed in a supply oil passage of the other engaging elements. Even when an operation malfunction is caused in any of the electromagnetic valves, the corresponding changeover valve is operated to establish engagement of the clutches C1and C2, thereby forming a given shift stage.
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patent: 6865965 (2005-03-01), Uchino
patent: 6929584 (2005-08-01), Miyata et al.
patent: 2001/0009880 (2001-07-01), Suzuki et al.
patent: 2689421 (1997-08-01), None
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patent: 2001-248721 (2001-09-01), None
patent: 2001-248724 (2001-09-01), None
Aisin Seiki Kabushiki Kaisha
Buchanan & Ingersoll & Rooney PC
Lewis Tisha D
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