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

1989-12-08

1991-05-07

Lorence, Richard

192 clutches and power-stop control

Vortex-flow drive and clutch

With brake

3644241, B60K 4126

Patent

active

050129104

ABSTRACT:
A continuously variable transmission for a motor vehicle has a drive pulley, a driven pulley, and a belt engaged with both the pulleys. A hydraulic circuit has a pump for supplying oil to hydraulic cylinders of both pulleys, and a transmission ratio control valve has a spool slidably mounted in a valve body for controlling the oil supplied to the cylinder of the drive pulley to change the transmission ratio. The locking of the wheels of the vehicle at braking of the vehicle is detected, and releasing of the locked wheels is detected. The transmission ratio is held at the detected locking of the wheels. And the held transmission ratio is released when releasing of the locked wheels is detected.

REFERENCES:
patent: 4039061 (1977-08-01), Pruvot et al.
patent: 4674363 (1987-06-01), Miyawaki
patent: 4829433 (1989-05-01), Nakano et al.
patent: 4913270 (1990-04-01), Ishido et al.

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