Transmission ratio control system for a continuously variable tr

Details Transmission ratio control system for a continuously variable tr Transmission ratio control system for a continuously variable tr

1987-08-21

1989-05-30

Wright, Dirk

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74870, B60K 4114

Patent

active

048339440

ABSTRACT:
A control system for a continuously variable transmission for a motor vehicle has a transmission ratio control valve having a spool for controlling oil supplied to a cylinder of a drive pulley to change the transmission ratio. The transmission ratio control valve has chambers at both ends of the spool. By controlling flow rate of oil supplied to the chambers in accordance with a desired transmission ratio, the spool is shifted, so that the transmission ratio changing rate is controlled. At kickdown of the transmission, two desired value signals are applied to correct the desired transmission ratio and desired transmission ratio changing rate so as to quickly increase the transmission ratio to a value smaller than the desired transmission ratio at the kickdown.

REFERENCES:
patent: 4622865 (1986-11-01), Itoh et al.
patent: 4623773 (1986-12-01), Itoh et al.
patent: 4649486 (1987-03-01), Oshiage
patent: 4663990 (1987-05-01), Itoh et al.
patent: 4669334 (1987-06-01), Miyaura et al.
patent: 4682519 (1987-07-01), Okada et al.
patent: 4683779 (1987-08-01), Osanai et al.
patent: 4704683 (1987-11-01), Osanai
patent: 4710879 (1987-12-01), Vahabzadeh
patent: 4720793 (1988-01-01), Watanabe et al.

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