System for controlling transmission ratio of a continuously vari

Details System for controlling transmission ratio of a continuously vari System for controlling transmission ratio of a continuously vari

1986-12-19

1988-08-16

Novosad, Stephen J.

Endless belt power transmission systems or components

Pulley with belt-receiving groove formed by drive faces on...

Fluid pressure actuator for adjustment of member

74856, 74866, F16H 1102

Patent

active

047641568

ABSTRACT:
A control system for a motor vehicle provided with a continuously variable transmission. The transmission has a drive pulley, a driven pulley, a transmission ratio control valve having ports and a spool, and a hydraulic circuit for supplying oil to the transmission ratio control valve so as to control the transmission ratio. When a speed sensor of one of the pulleys fails to properly sense the speed of the pulley, the transmission ratio control valve is operated by fail-safe operation so as to maintain the ratio transmission to a proper value.

REFERENCES:
patent: 4547178 (1985-10-01), Hayakawa et al.
patent: 4601680 (1986-07-01), Tokoro et al.
patent: 4631043 (1986-12-01), Tokoro et al.
patent: 4660440 (1987-04-01), Matsumura et al.

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