Control system for an infinitely variable transmission

Details Control system for an infinitely variable transmission Control system for an infinitely variable transmission

1985-11-08

1987-06-16

Herrmann, Allan D.

Machine element or mechanism

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

Preselected indexed position

474 28, 3644241, B60K 4112, B60K 4118

Patent

active

046728643

ABSTRACT:
An infinitely variable transmission comprises a drive pulley having a hydraulically shiftable disc, a driven pulley having a hydraulically shiftable disc, and a belt engaged with both pulleys. The system has a pressure oil circuit having a line pressure control valve having a spool for controlling line pressure, and a transmission ratio control valve having a spool for controlling the pressurized oil to change the transmission ratio. A first electromagnetic valve is provided for controlling control pressure applied to the spool of the line pressure control valve in accordance with desired transmission ratio and engine torque, and a second electromagnetic valve is provided for controlling control pressure applied to the spool of the transmission ratio control valve in accordance with the desired transmission ratio and actual transmission ratio.

REFERENCES:
patent: 4387608 (1983-06-01), Mohl et al.
patent: 4458318 (1984-07-01), Smit et al.
patent: 4458560 (1984-07-01), Frank et al.
patent: 4466521 (1984-08-01), Hattori et al.
patent: 4470117 (1984-09-01), Miki et al.
patent: 4509125 (1985-04-01), Fattic et al.
patent: 4515040 (1985-05-01), Takeuchi et al.
patent: 4515041 (1985-05-01), Frank et al.
patent: 4546673 (1985-10-01), Shigematsu et al.
patent: 4584907 (1986-04-01), Niwa et al.

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