Control apparatus for automatic transmission

Details Control apparatus for automatic transmission Control apparatus for automatic transmission

1993-07-23

1995-08-22

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

B60K 4110

Patent

active

054435951

ABSTRACT:
A control apparatus for an automatic transmission having a set of frictional engagement elements arranged to be selectively engaged or disengaged in shift-up operation of the transmission, and a shift timing valve arranged to be switched over by hydraulic pilot pressure applied there-to under control of a solenoid valve for switching over discharge of fluid under pressure from one of the frictional engagement elements to be disengaged in the shift-up operation from a slow-drain condition to a quick-drain condition. The control apparatus is designed to detect a drive torque of a vehicle engine, to determine a timing period for energization of the solenoid valve in the shift-up operation in accordance with the drive torque of the vehicle engine, to maintain the solenoid valve in its deenergized condition during the timing period, and to energize the solenoid valve upon lapse of the timing period.

REFERENCES:
patent: 4882952 (1989-11-01), Kashihara et al.
patent: 4922424 (1990-05-01), Hiramatsu
patent: 5003842 (1991-04-01), Hatta et al.
patent: 5014575 (1991-05-01), Fujiwara et al.
patent: 5046384 (1991-09-01), Imamura
patent: 5058461 (1991-10-01), Shimei
patent: 5075858 (1991-12-01), Narita

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