Transmission ration control system for a continuously variable t

Details Transmission ration control system for a continuously variable t Transmission ration control system for a continuously variable t

1989-04-14

1990-07-24

Braun, Leslie A.

Machine element or mechanism

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

Preselected indexed position

74867, 3644241, B60K 4114

Patent

active

049427830

ABSTRACT:
A control system for a continuously variable transmission for a motor vehicle has a line pressure control valve and a transmission ratio control valve, each having a spool for controlling oil supplied to a cylinder of a pulley. The transmission ratio control valve has chambers at both ends of the spool. The flow rate of oil supplied to the chambers is controlled by an on-off valve at duty ratio in accordance with a desired transmission ratio so that the spool is shifted, so that the transmission ratio changing speed is controlled. The duty ratio is corrected by line pressure, so that the transmission ratio is controlled in accordance with the line pressure.

REFERENCES:
patent: 4253347 (1981-03-01), Mizuno et al.
patent: 4505169 (1985-03-01), Ganoung
patent: 4515040 (1985-05-01), Takeuchi et al.
patent: 4628773 (1986-12-01), Itoh et al.
patent: 4674363 (1987-06-01), Miyawaki
patent: 4680991 (1987-07-01), Miyawaki
patent: 4702128 (1987-10-01), Oshiage
patent: 4708031 (1987-11-01), Morimoto et al.

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