Control apparatus for continuously variable vehicular transmissi

Details Control apparatus for continuously variable vehicular transmissi Control apparatus for continuously variable vehicular transmissi

1996-07-02

1998-02-03

Ta, Khoi Q.

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

477 48, 477 49, 477 98, F16H 6100

Patent

active

057138150

ABSTRACT:
By a controller which controls a speed-change control valve for switching a hydraulic pressure to be supplied to each of cylinder chambers of each of pulleys of a continuously variable vehicular transmission, the speed reduction ratio is controlled such that the engine revolution speed becomes a target revolution speed which is set depending on the running conditions of a vehicle. When an accumulated time of high-speed operation at which Ne becomes higher than a predetermined first set revolution speed exceeds a first set time, an upper limit value of Ne or the target revolution speed is corrected to decrease. Further, when the duration time of a low-speed revolution below a predetermined second set revolution speed which is smaller than the first set revolution speed exceeds a second set time, the upper limit value of Ne is corrected to increase or the correction to decrease the target revolution speed is stopped.

REFERENCES:
patent: 4653006 (1987-03-01), Osanai et al.
patent: 4653007 (1987-03-01), Osanai et al.
patent: 5050455 (1991-09-01), Yamashita et al.
patent: 5600557 (1997-02-01), Ogawa
patent: 5612873 (1997-03-01), Ogawa

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