Interrelated power delivery controls – including engine control – Clutch control – With fluid drive
Patent
1999-07-07
2000-10-31
Estremsky, Sherry
Interrelated power delivery controls, including engine control
Clutch control
With fluid drive
477175, 477176, F16H 6114
Patent
active
061394726
ABSTRACT:
A lockup control system controls a lockup state of the automatic transmission employing a torque converter with a lockup clutch. The lockup control system executes a lockup clutch engagement pressure control for decreasing an engagement differential pressure of the lockup clutch at a predetermined differential pressure for a predetermined time period under a coast lockup state. Further, the lockup control system executes a learning control for obtaining the predetermined differential pressure by adding a differential pressure correction value to a differential pressure learning value by which the torque converter generates a slight slip under the coast lockup state. Therefore, even during the coast lockup state, both of suppressing vibrations by a lowering of a lockup capacity and maintaining a responsibility for re-increasing the differential pressure are ensured.
REFERENCES:
patent: 5616099 (1997-04-01), Sakai
patent: 5616100 (1997-04-01), Sakai et al.
patent: 5667458 (1997-09-01), Narita et al.
patent: 5916293 (1999-06-01), Katakura et al.
patent: 5935043 (1999-08-01), Watanabe et al.
patent: 5947865 (1999-09-01), Watanabe et al.
Harada Chiaki
Sakakibara Satoshi
Ueki Akihiro
Estremsky Sherry
Nissan Motor Co,. Ltd.
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