Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Patent
1997-07-28
1999-03-30
Wright, Dirk
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
477144, 477156, 701 61, F16H 6108
Patent
active
058881700
ABSTRACT:
A downshift control device for an automatic transmission is provided in which the transmission is shifted down by releasing an oil pressure from a first engaging element that has been engaged while applying an oil pressure to a second engaging element that has been released. Thus downshift control device includes power-on downshift determining mechanism, gear-ratio detecting mechanism for detecting a gear ratio that changes during power-on downshift control, downshift released pressure control mechanism for generating a command to increase the pressure released from the first engaging element to a released pressure control actuator when the detected gear ratio reaches a first predetermined gear ratio, and downshift applied pressure control mechanism for generating a command to increase the pressure applied to the second engaging element to an applied pressure control actuator when the detected gear ratio reaches a second predetermined gear ratio that is larger than the first predetermined gear ratio and is established just before completion of shifting.
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Fujita Yoshifumi
Takiguchi Masahiro
Jatco Corporation
Kwon Peter T.
Wright Dirk
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