Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Patent
1995-11-29
1997-03-25
Marmor, Charles A.
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
477156, 477906, F16H 6116
Patent
active
056139217
ABSTRACT:
A gear shift control apparatus for use in an automatic transmission having a friction element operable on a hydraulic pressure applied thereto in an engaged and disengaged state. A shift change control is performed to change the hydraulic pressure in a manner to produce a shift change according to a predetermined shift schedule based on transmission input and output shaft speeds and engine load. A section is provided for calculating the gear ratio obtained in the automatic transmission based on the transmission input and output shaft speeds. When a change is effected to one of highest and lowest gears or when a change is effected from one of the highest and lowest gears, a transient hydraulic pressure control of changing the hydraulic pressure from the first level to the second level is performed to change the friction element state so as to effect a shift change when the calculated gear ratio reaches a reference gear ratio. The transient hydraulic pressure control is interrupted with inhibition of any change to the highest and/or lowest gear when at least one of the first sensor, the second sensor and the gear ratio calculated section is subject to failure.
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Fujita Yoshifumi
Hirose Ikuo
Sugiyama Hideharu
Jatco Corporation
Kwon Peter
Marmor Charles A.
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