Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Patent
1992-11-27
1995-04-04
Wright, Dirk
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
477131, 477132, 477143, F16H 6104, F16H 6108
Patent
active
054032482
ABSTRACT:
A control system is provided for servo hydraulic pressure in an automatic transmission having planetary gear mechanisms. First and second frictional engagement devices, whose servo pressures are reversed in feed/drain relationship between desired two high speed stages, are controlled by a shift valve and a directional control valve. The shift valve is switched by a first solenoid. The directional control valve is interposed in a servo hydraulic pressure feed/drain line communicating the shift valve with the first frictional engagement device and is controlled by a second solenoid. The first and second solenoids are controlled by an electronic control unit in accordance with a shift position detected by a detector, whereby the timings of feed or drain of the servo hydraulic pressures to or from the first and second frictional engagement devices are changed by predetermined relative amounts, respectively.
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Ando Masahiko
Hayabuchi Masahiro
Hojo Yasuo
Noda Koji
Oba Hidehiro
Aisin Aw Co. Ltd.
Ta Khoi Q.
Toyota Jidosha & Kabushiki Kaisha
Wright Dirk
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