Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1987-07-20
1989-08-22
James, Andrew J.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
3644241, B60K 4112
Patent
active
048584975
ABSTRACT:
A hydraulic control system for a continuously variable transmission for an automotive vehicle, the transmission having a first and a second variable-diameter pulley provided on respective second shafts, a belt connecting the first and second pulleys, and a first and a second hydraulic cylinder for changing effective diameters of the pulleys. The system includes a first pressure regulating valve, a shift-control valve for applying the first line pressure to one of the cylinders, and a second pressure regulating valve for regulating a pressure of the fluid flowing from the other cylinder, and thereby establishing a second line pressure. The system further includes a control device for controlling the shift-control valve so that an actual speed ratio of the transmission coincides with a target speed ratio determined depending upon a running condition of the vehicle. The control device is adapted to effect a feedback control of the first pressure regulating valve, to regulate the first line pressure so that a control error between the actual and target speed ratios coincides with a predetermined constant target value.
REFERENCES:
patent: 4653005 (1987-03-01), Osanai
patent: 4671138 (1987-06-01), Nobumoto
James Andrew J.
Soltz David
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