Controller and control method for continuously variable transmis

Details Controller and control method for continuously variable transmis Controller and control method for continuously variable transmis

1997-03-07

1999-02-16

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

477 48, B60K 4112

Patent

active

058714162

ABSTRACT:
In a continuously variable transmission (CVT) for a vehicle wherein a belt of V-shaped cross-section is looped around a drive pulley and a driven pulley respectively having grooves of identical shape to this belt, and the width of the groove of each pulley is varied according to a supplied oil pressure, an oil pressure when an accelerator pedal is released is maintained at or above a predetermined value. The oil pressure is controlled according to a torque input to the drive pulley, and the input torque varies according a depression amount of the accelerator pedal. As a result, the speed change ratio easily varies due to insufficient oil pressure when the accelerator pedal is released. This invention stops decline of oil pressure when the accelerator is released, and thereby prevents variation of the speed change ratio due to release of the accelerator pedal. This is especially useful when the speed change ratio of the transmission has been fixed by the driver in a manual speed change mode.

REFERENCES:
patent: 4708031 (1987-11-01), Morimoto et al.
patent: 4823267 (1989-04-01), Kumura
patent: 5199399 (1993-04-01), Shibuya
patent: 5259272 (1993-11-01), Yamamoto et al.
patent: 5642644 (1997-07-01), Lardy et al.

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