Control system for continuously variable transmission

Details Control system for continuously variable transmission Control system for continuously variable transmission

1998-07-27

2000-02-29

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

F16H 1106

Patent

active

060303131

ABSTRACT:
A control system comprises a line pressure control section which controls a line pressure applied to pulleys of a CVT according to an input load from the engine. When the input load is temporally increased, the line pressure is temporally increased by a pressure increasing section. After the line pressure is held for a predetermined time, the temporally increased line pressure is slowly decompressed by a step amount which is set small according to the increase of a transmission ratio of the CVT. This slow decompression of the line pressure suppresses the generation of vibrations of a drive system. Further, when an anti-skid control apparatus is operating or when a start clutch is engaged by the increase of the line pressure, the slow decompression is cancelled to smoothly execute their operations.

REFERENCES:
patent: 4682519 (1987-07-01), Okada et al.
patent: 4734082 (1988-03-01), Tezuka
patent: 4759236 (1988-07-01), Tezuka et al.
patent: 5052247 (1991-10-01), Kato et al.
patent: 5616100 (1997-04-01), Sakai et al.
patent: 5697866 (1997-12-01), Okahara

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