Control system for a continuously variable transmission

Details Control system for a continuously variable transmission Control system for a continuously variable transmission

1987-03-24

1989-01-03

Braun, Leslie A.

Machine element or mechanism

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

Preselected indexed position

74868, B60K 4112

Patent

active

047948191

ABSTRACT:
A control system for a continuously variable transmission has a transmission ratio control valve having a spool for controlling oil supplied to a cylinder of a drive pulley to change the transmission ratio. The tansmission ratio control valve has chambers at both ends of the spool. By controlling flow rate of oil supplied to the chambers with a control signal in accordance with a desired transmission ratio, the spool is shifted, so that the transmission ratio is controlled to a desired transmission ratio. When the actual transmission ratio does not coincide with the desired ratio in a steady state of an engine, the control signal is corrected so as to reduce the difference between the desired transmission ratio and the actual ratio.

REFERENCES:
patent: 4458560 (1984-07-01), Frank et al.
patent: 4462275 (1984-07-01), Mohl et al.
patent: 4476746 (1984-10-01), Miki et al.
patent: 4509125 (1985-04-01), Fattic et al.
patent: 4594916 (1986-06-01), Ito et al.
patent: 4637280 (1987-01-01), Oshiage
patent: 4653006 (1987-03-01), Osanai et al.
patent: 4658360 (1987-04-01), Osanai et al.
patent: 4672864 (1987-06-01), Morimoto
patent: 4680990 (1987-07-01), Ohgami

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