Control apparatus for automatic transmissions

Details Control apparatus for automatic transmissions Control apparatus for automatic transmissions

1996-12-20

1998-12-01

Lorence, Richard M.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477156, 477158, 477116, 477117, F16H 6108

Patent

active

058429506

ABSTRACT:
To optimize the application hydraulic pressure of the friction application elements in the transmission mechanism, and to reduce the unnecessary load on each member, the transmission mechanism of an automatic transmission is provided with a plurality of friction application elements which are applied simultaneously in order to achieve the designated gear stage, and hydraulic servos which operate the friction application elements independently. The control apparatus has an information detecting means, an input torque calculating means which calculates the input torque of the transmission mechanism on the basis of this information, an application hydraulic pressure calculating means which calculates the necessary application hydraulic pressure required to maintain the application of each individual friction application element on the basis of the input torque, and a supply means which supplies the necessary application hydraulic pressure to the hydraulic servos of the friction application elements. The supply means makes the hydraulic pressure supplied to each hydraulic servo the necessary application hydraulic pressure calculated for each friction application element independently when achieving the designated gear stage.

REFERENCES:
patent: 5086668 (1992-02-01), Fujiwara et al.
patent: 5368531 (1994-11-01), Ando et al.
patent: 5429561 (1995-07-01), Wakahara et al.
patent: 5445579 (1995-08-01), Fujita et al.

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