Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Patent
1994-06-02
1995-12-05
Marmor, Charles A.
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
477131, 477142, 477906, 475116, 475122, 475128, F16H 6112
Patent
active
054723892
ABSTRACT:
A hydraulic control for an automatic transmission is composed of a gear shift mechanism having first and second frictional engagement elements, a hydraulic control unit for the engagement elements, and an electronic control unit for the hydraulic control unit. The first element is engaged to achieve a first speed stage and the second element is engaged to achieve a second speed stage faster than and closest to the first speed stage. The hydraulic control unit has a first directional control valve for switching the feeding and discharge of hydraulic pressure between the first and second engagement elements, responsive to a first solenoid signal from the electronic control unit. A second directional control valve is adapted to be switched by a second solenoid signal from the electronic control unit to achieve a third speed stage yet faster than the second speed stage. The first engagement element has a discharge line connected to a drain line via the second directional control valve. The electronic control unit has a detector for determination of tie-up of either or both of the engagement elements, whereby upon detection of tie-up by the detector, the second solenoid signal is output to the second directional control valve.
REFERENCES:
patent: 3868866 (1975-03-01), Lentz
patent: 4713989 (1987-12-01), Hayakawa et al.
patent: 4817474 (1989-04-01), Morisawa
patent: 4942787 (1990-07-01), Aoki et al.
patent: 5079970 (1992-01-01), Butts
patent: 5109734 (1992-05-01), Fujiwara
Ando Masahiko
Fukatsu Akira
Hojo Yasuo
Iwatsuki Kunihiro
Kaigawa Masato
Aisin Aw Co. Ltd.
Estremsky Sherry Lynn
Marmor Charles A.
Toyota Jidosha & Kabushiki Kaisha
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