Failsafe control apparatus for belt-type continuously variable t

Interrelated power delivery controls – including engine control – Transmission control – Continuously variable friction transmission

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Details

477906, 424 28, B60K 4112, F16H 5900, F16H 6100

Patent

active

056650230

ABSTRACT:
A control apparatus for a belt-type continuously variable transmission that has a drive pulley, a driven pulley, a V-belt trained around the drive and driven pulleys, a drive cylinder for varying the pulley width of the drive pulley, and a driven cylinder for varying the pulley width the said driven pulley. A pressure regulator valve produces pulley control pressures supplied to the drive and driven cylinders and a shift valve distributes the pulley control pressures to the drive and driven cylinders for varying the widths of the drive and driven pulleys for speed ratio control. An electric shift control normally controls the shift valve by electric power supplied to solenoid valves but the electric shift control causes the pressures in both the drive cylinder and said driven cylinder to be equal when the electric power is lost.

REFERENCES:
patent: 4403975 (1983-09-01), Rattunde
patent: 4475416 (1984-10-01), Underwood
patent: 4515040 (1985-05-01), Takeuchi et al.
patent: 4534243 (1985-08-01), Yokoyama et al.
patent: 4669336 (1987-06-01), Okada et al.
patent: 4716791 (1988-01-01), Ohzono et al.
patent: 4857034 (1989-08-01), Kouno et al.
patent: 5176579 (1993-01-01), Ohsono et al.
patent: 5183439 (1993-02-01), Yumoto et al.
patent: 5427579 (1995-06-01), Kanehara et al.
English language Abstracts of above listed Japanese publications.
European Search Report.

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