Apparatus for controlling concurrent releasing and engaging acti

Details Apparatus for controlling concurrent releasing and engaging acti Apparatus for controlling concurrent releasing and engaging acti

1996-02-13

1997-07-01

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

F16H 6110, F16H 6106

Patent

active

056431350

ABSTRACT:
An apparatus for controlling an automatic transmission of a motor vehicle wherein two hydraulically operated frictional coupling devices are released and engaged, respectively, to effect a clutch-to-clutch shift-up action of the transmission, and a shift-up boundary line for determining whether the shift-up action should take place is compensated by a learning shift-point compensating device, so as to prevent a rise of the vehicle engine above an upper limit during the shift-up action effected according to the compensated shift-up boundary line, the apparatus including an inhibiting device for inhibiting an operation of the learning shift-point compensating device if an amount of overshoot of the engine speed detected during the shift-up action is larger than a predetermined threshold. The apparatus may further includes a pressure compensating device for compensating a releasing pressure of the above-indicated one frictional coupling device, and a compensating coordinating device for controlling one of the shift-point and hydraulic pressure compensating devices depending upon an effect achieved or expected to be achieved by the other compensating device.

REFERENCES:
patent: 5007308 (1991-04-01), Narita
patent: 5347885 (1994-09-01), Taga et al.
patent: 5393275 (1995-02-01), Okada et al.
patent: 5415056 (1995-05-01), Tabata et al.
patent: 5425687 (1995-06-01), Taga et al.

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