Control system of a downshift by an automatic transmission gear

Details Control system of a downshift by an automatic transmission gear Control system of a downshift by an automatic transmission gear

1996-12-30

1998-12-15

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477139, 477149, 477161, F16H 5920, F16H 5940, F16H 5942, F16H 6108

Patent

active

058489517

ABSTRACT:
A control system for downshifting an automatic transmission provides reduced shift shock by controlling pressure fed to a kickdown servo brake. A throttle valve sensor, an input shaft rpm sensor, an output shaft rpm sensor, and a transmission control unit are used. The transmission control unit outputs a control signal for a second-to-first speed shift after reducing hydraulic pressure fed in accordance with a duty pattern when the vehicle is in the state of a second-to-first downshift. Alternatively, the transmission control units outputs a control signal for a second-to-first speed shift after the third-to-second speed shift is completed when the vehicle is in the state of a third-to-first speed shift. In any case, the transmission control units controls first and second transmission control solenoid valves, and a hydraulic pressure control solenoid valve for changing the state of hydraulic pressure fed to every friction member.

REFERENCES:
patent: 4563917 (1986-01-01), Higashi et al.
patent: 4688452 (1987-08-01), Aoyama et al.
patent: 5085105 (1992-02-01), Wakahara et al.
patent: 5188006 (1993-02-01), Goto et al.
patent: 5431604 (1995-07-01), Marusue et al.

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