Hydraulic pressure control for continuously variable...

Details Hydraulic pressure control for continuously variable... Hydraulic pressure control for continuously variable...

2005-02-01

2005-02-01

Ho, Ha (Department: 3681)

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

C477S045000, C477S046000, C477S127000

Reexamination Certificate

active

06849030

ABSTRACT:
A belt type continuously variable transmission (CVT) (10) for a vehicle varies the speed ratio in accordance with the hydraulic pressure that is regulated via a hydraulic pressure regulating unit (30). A sensor (27) detects a vehicle speed. A CVT controller (20) calculates a target hydraulic pressure that is supplied to the CVT (10) on the basis of a predetermined speed change schedule so that the speed ratio varies in the direction of up-shifting as the vehicle speed increases (S15). The CVT controller (20) also determines whether or not a specified condition holds (S16, S160), and controls the hydraulic pressure regulating unit according to a target start-up hydraulic pressure which is larger than a target hydraulic pressure for normal running (S11, S13), thereby preventing a speed change lag when the vehicle starts to move.

REFERENCES:
patent: 5445577 (1995-08-01), Fujita et al.
patent: 5665029 (1997-09-01), Minowa et al.
patent: 5667457 (1997-09-01), Kuriyama et al.
patent: 06-17914 (1994-01-01), None
patent: 9-329229 (1997-12-01), None
patent: 2000-18347 (2000-01-01), None

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