Interrelated power delivery controls – including engine control – Transmission control – Including fluid drive
Patent
1994-09-07
1996-01-23
Wright, Dirk
Interrelated power delivery controls, including engine control
Transmission control
Including fluid drive
477 62, F16H 6114
Patent
active
054861462
ABSTRACT:
A hydraulic control circuit for an automatic transmission which has a plurality of hydraulic type frictional engagement elements for switching gear stages and a lockup clutch juxtaposed to a hydraulic power transmission device for transmitting engine power to the gearing. The hydraulic control circuit includes a lockup relay valve for switching oil pressure between an application side oil chamber and a release side oil chamber of the lockup clutch to apply and release the lockup clutch and a lockup switching valve for switching the lockup relay valve. A lockup control valve functions to increase the pressure difference between the application side oil chamber and the release side oil chamber at the time of application of the lockup clutch, as a signal pressure rises. A transient pressure control valve controls the transient pressure of a hydraulic frictional engagement element in accordance with the signal pressure. A single linear solenoid valve regulates the signal pressure fed both to the lockup control valve and to the transient pressure control valve. A signal pressure relay valve has a first output port connected to the lockup control valve and a second output port connected to the transient pressure control valve. The signal pressure relay valve is switched by first and second relay pressures to selectively switch the destination of the signal pressure which is regulated by the linear solenoid valve. When the signal pressure is fed to the accumulator control valve, a modulator oil pressure is fed to the lockup control valve.
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patent: 5010991 (1991-04-01), Tsukamoto et al.
patent: 5152386 (1992-10-01), Imamura
Asahara Norimi
Fukumura Kagenori
Hojo Yasuo
Ozaki Kazuhisa
Aisin Aw Co. Ltd.
Wright Dirk
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